Patent Description:
A vehicle powertrain of an electric vehicle includes a motor and a transmission. As a power source, the motor has a relatively high rotational speed, and a transmission with a specific reduction ratio needs to be matched to transmit power of the motor to a wheel end. When the vehicle powertrain works, the motor generates a large amount of heat, and in addition, a bearing and a gear in the transmission have high rotational speeds and large load, and a great amount of heat is generated because of friction of surfaces of the bearing and the gear. To prevent a transmission failure, a cooling and lubrication design is introduced into the motor and the transmission during engineering design, to ensure that parts fall within a proper working temperature range. The <CIT> refers to a transmission (<NUM>, <FIG> and <FIG>), comprising a box body with an inner cavity and a gear set (<NUM> and around <NUM>) and an oil supply device (<NUM>, comprising three chambers: left, central and right) that are accommodated in the box body, wherein an oil sump (<NUM>) carrying lubricating oil is disposed at the bottom of the inner cavity;the oil supply device (<NUM>) is fastened on a side (<FIG>) that is of the gear set and that is away from the oil sump, the oil supply device comprises a sealing chamber (<NUM>, central chamber of <NUM>) and an oil collection tank (<NUM>, left chamber of <NUM>) that are fastened to each other, and the oil collection tank is located above the sealing chamber; - an oil inlet (upper opening of <NUM>) and at least one oil pipe (12c) are disposed for the sealing chamber, and the at least one oil pipe extends in different directions; and the sealing chamber is configured to: receive the lubricating oil that is in the oil sump and that is transported from the oil inlet, and send (via a pump <NUM>) the lubricating oil to at least one to-be-lubricated part (gear <NUM>, shaft K or bearing <NUM>) of the gear set through the at least one oil pipe; and the oil collection tank has an upper opening, the oil collection tank is configured to: when the gear set rotates, receive, by using the upper opening, the lubricating oil (<NUM>, <FIG>) that is in the oil sump and that is stirred and transported by the gear set, at least one oil transport tank (<NUM>, right chamber of <NUM>) is further disposed (right chamber <NUM> is further disposed than left chamber <NUM>, in the direction of arrow <NUM>) for the oil collection tank, a quantity (one) of oil transport tanks is the same as a quantity of oil spray (12c), and any oil transport tank is disposed corresponding to one oil pipe, and is configured to lubricate a same to-be-lubricated part together with the corresponding oil pipe. The <CIT> refers to a vehicle drive-force transmitting apparatus.

Currently, driven by a market, vehicle powertrains are evolving toward miniaturization and high power. A maximum rotational speed and maximum load of the vehicle powertrain constantly increase to achieve higher power density and total power. With the increase of the rotational speed and the load, heat generated by the motor and the transmission significantly increases, and ensuring efficient cooling and lubrication of the motor and the transmission becomes a bottleneck restricting miniaturization of the powertrain.

This application is intended to provide a reliably lubricated transmission, to adapt to working statuses of the transmission at different rotational speeds. This application further provides a vehicle powertrain including the transmission and a vehicle. Both the vehicle powertrain and the vehicle are configured based on characteristics of the transmission, to obtain better lubrication and cooling effects.

According to a first aspect, this application relates to a transmission, including a box body with an internal cavity and a gear set and an oil supply device that are accommodated in the box body. An oil sump carrying lubricating oil is disposed at the bottom of the inner cavity. The oil supply device is fastened on a side that is of the gear set and that is away from the oil sump, the oil supply device includes a sealing chamber and an oil collection tank that are fastened to each other, and the oil collection tank is located above the sealing chamber. An oil inlet port and at least one oil spray pipe are disposed for the sealing chamber, and the at least one oil spray pipe extends in different directions; and the sealing chamber is configured to: receive the lubricating oil that is in the oil sump and that is transported from the oil inlet port, and spray the lubricating oil to at least one to-be-lubricated part of the gear set through the at least one oil spray pipe. The oil collection tank has an upper opening, the oil collection tank is configured to: when the gear set rotates, receive, by using the upper opening, the lubricating oil that is in the oil sump and that is stirred and transported by the gear set, at least one oil transport tank is further disposed for the oil collection tank, a quantity of oil transport tanks is the same as a quantity of oil spray pipes, and any oil transport tank is disposed corresponding to one oil spray pipe, and is configured to lubricate a same to-be-lubricated part together with the corresponding oil spray pipe.

In the transmission in this application, the gear set and the oil supply device are accommodated in the inner cavity of the box body, and the oil sump is formed in the inner cavity of the box body, to implement rotation and deceleration functions of the transmission. In addition, the lubricating oil in the oil sump is transported to the oil supply device to lubricate a preset to-be-lubricated part of the gear set. Because the oil supply device is fastened on the side that is of the gear set and that is away from the oil sump, in other words, the oil supply device is vertically fastened above the gear set, the lubricating oil transported by the oil supply device from the oil transport tank and/or the oil spray pipe can flow to the to-be-lubricated part of the gear set under an action of gravity.

Because of the oil inlet port, the oil supply device allows the lubricating oil to flow to the sealing chamber, and the lubricating oil in the sealing chamber can flow out through the oil spray pipe to act on the to-be-lubricated part of the gear set. The sealing chamber can provide specific pressure to the lubricating oil to ensure that the oil spray pipe sprays the lubricating oil to the to-be-lubricated part at a specific speed, to implement active lubrication on the to-be-lubricated part.

When the gear set rotates, the oil supply device further collects, by using the upper opening of the oil collection tank located above the sealing chamber, the lubricating oil stirred and transported by the gear set, and the lubricating oil flows out from the oil transport tank to act on the to-be-lubricated part of the gear set, to implement passive lubrication on the to-be-lubricated part.

For a same to-be-lubricated part of the gear set, an extension path of the oil spray pipe extending from the sealing chamber corresponds to that of the oil transport tank extending from the oil collection tank, so that both the oil spray pipe and the oil transport tank can extend toward the to-be-lubricated part, to respectively implement active lubrication and passive lubrication on the to-be-lubricated part.

While the oil supply device in this application implements active lubrication and passive lubrication on each to-be-lubricated part of the gear set, the oil supply device can also correspondingly adjust, for different positions of to-be-lubricated parts through matching between the oil transport tank and the oil spray pipe, extension paths of the oil transport tank and the oil spray pipe respectively relative to the oil collection tank and the sealing chamber, to match the position of the to-be-lubricated part, thereby achieving a lubrication effect. The positions of the to-be-lubricated parts of the gear set and a quantity of to-be-lubricated parts may be randomly adjusted based on a requirement of an actual engineering structure, without affecting a lubrication effect of the oil supply device, so that normal working of the gear set is ensured, and reliability of the transmission is improved.

In a possible embodiment, the gear set includes a first gear and a second gear that are engaged with each other, and the first gear and the second gear are separately rotatably connected to the box body. The bottom of the first gear is located in the oil sump and immersed in the lubricating oil, a side that is of the first gear and that is away from the second gear rotates from bottom to top, the first gear is spaced from an inner wall of the box body to form an oil stirring channel, and when the first gear rotates, the lubricating oil in the oil sump can be driven to enter the oil collection tank through the oil stirring channel.

In this embodiment, the first gear is immersed in the lubricating oil carried in the oil sump, and when the first gear rotates, the lubricating oil can be transported to the oil collection tank of the oil supply device through the oil stirring channel formed by the first gear and the inner wall, to implement a passive lubrication function on each to-be-lubricated part of the gear set.

In a possible embodiment, the oil supply device is disposed on a side that is of the first gear and that is close to the second gear, the inner wall of the box body includes a first side wall and a top wall, the first side wall is located on the side that is of the first gear and that is away from the second gear, the top wall is located above the first side wall, and the first side wall and the top wall form the oil stirring channel together with the first gear.

In this embodiment, the side that is of the first gear and that is away from the second gear rotates from bottom to top, and the side that is of the first gear and that is close to the second gear rotates from top to bottom. When the oil supply device is disposed on the side that is of the first gear and that is close to the second gear, the lubricating oil stirred by the first gear needs to pass over the top of the first gear and then be transported to the oil collection tank. In this case, the first side wall and the top wall form the oil stirring channel together with the first gear, so that the lubricating oil stirred by the first gear passes through the oil stirring channel, and is transported to the oil collection tank.

The top wall includes a first end face close to the first side wall and a second end face opposite to the first end face, and the second end face is vertically located below the first end face, to guide the lubricating oil in the oil stirring channel to flow to the oil collection tank.

In this embodiment, a side that is of the top wall and that is close to the first side wall needs to be spaced from the top of the first gear, and a side that is of the top wall and that is away from the first side wall may be vertically located below the first end face, so that a tilted surface tilted from the first gear toward the oil collection tank is formed, to guide more lubricating oil to fall into the oil collection tank.

In a possible embodiment, a distance between a liquid level of the lubricating oil in the oil sump and a rotation center of the first gear is less than or equal to a radius of a dedendum circle of the first gear.

In this embodiment, the liquid level of the lubricating oil in the oil sump is defined, to ensure a depth of the first gear immersed in the lubricating oil, thereby ensuring that the first gear can stir a sufficient amount of oil into the oil collection tank.

According to the invention, the transmission further includes an oil transport component, the oil transport component includes an oil transport pipeline and an oil transport pump, one end of the oil transport pipeline is connected to the oil inlet port of the oil supply device, the other end of the oil transport pipeline is connected to the oil sump, and the oil transport pump is configured to pump the lubricating oil in the oil sump into the sealing chamber through the oil transport pipeline.

The lubricating oil in the oil sump is transported to the sealing chamber through a connection between the oil transport component and the sealing chamber, to implement an active lubrication function on each to-be-lubricated part of the gear set.

In a possible embodiment, the first gear and the second gear are engaged with each other at a first engagement part, and the at least one to-be-lubricated part includes the first engagement part.

In this embodiment, the first gear and the second gear are engaged with each other at the first engagement part, and the first engagement part is lubricated to reduce friction between surfaces of the first gear and the second gear and prolong a service life of the gear set.

In a possible embodiment, the transmission further includes a third gear and a fourth gear, the third gear and the fourth gear are engaged with each other at a second engagement part, and the at least one to-be-lubricated part further includes the second engagement part.

In this embodiment, the gear set may further include more gears, and the more gears are engaged with each other for transmission. In this case, the oil supply device may further lubricate other engagement parts to reduce a friction loss of the gear set.

In a possible embodiment, the gear set further includes a first gear shaft, a second gear shaft, a first bearing, and a second bearing, the first gear shaft is fastened to the first gear, the second gear shaft is fastened to the second gear, the first bearing is configured to implement a rotatable connection between the first gear shaft and the box body, the second bearing is configured to implement a rotatable connection between the second gear shaft and the box body, and the to-be-lubricated part further includes a position of the first bearing and a position of the second bearing.

In this embodiment, a rotatable connection of the first gear relative to the box body may be implemented through cooperation of the first gear shaft and the first bearing. The first bearing is lubricated to reduce internal friction of the first bearing and prolong a service life of the first bearing. A rotatable connection of the second gear relative to the box body may be implemented through cooperation of the second gear shaft and the second bearing. The second bearing is also lubricated to reduce internal friction of the second bearing and prolong a service life of the second bearing.

In a possible embodiment, the gear set further includes a third gear shaft and a third bearing, the third gear shaft is fastened to the third gear, and is configured to implement a rotatable connection between the third gear shaft and the box body, and the to-be-lubricated part further includes a position of the third bearing.

In this embodiment, the gear set may further include the third bearing, and the oil supply device may further lubricate the third bearing to reduce internal friction of the third bearing and prolong a service life of the third bearing.

In a possible embodiment, the at least one oil spray pipe includes a lateral oil spray pipe, and the lateral oil spray pipe horizontally extends away from the sealing chamber. The at least one oil transport tank includes a lateral oil transport tank, a gap connected to the lateral oil transport tank is disposed on a side plate, and the lateral oil transport tank extends in a same direction as a corresponding lateral oil spray pipe, and is located above the corresponding lateral oil spray pipe.

In this embodiment, corresponding to some to-be-lubricated parts of the gear set that are located in a lateral direction of the oil supply device, the lateral oil spray pipe connected to the sealing chamber and the lateral oil transport tank connected to the oil collection tank by using the gap are disposed, the lateral oil transport tank is located above the lateral oil spray pipe, and the lateral oil transport tank and the lateral oil spray pipe may extend to the to-be-lubricated part of the gear set in parallel, to respectively achieve active lubrication and passive lubrication effects on the to-be-lubricated part.

In a possible embodiment, the lateral oil transport tank includes a tank bottom and two tank walls, the tank bottom is parallel to the lateral oil spray pipe, the two tank walls are disposed opposite to each other on both sides of the tank bottom, the tank bottom includes a first end close to the gap and a second end away from the gap, and the second end is vertically located below the first end or flush with the first end.

In this embodiment, the lubricating oil is guided to flow to the to-be-lubricated part by using the tank bottom and the tank wall of the lateral oil transport tank, to achieve a passive lubrication effect on the to-be-lubricated part. In addition, the second end is flush with or lower than the first end, to ensure that the lubricating oil smoothly flows to the to-be-lubricated part under an action of gravity.

In a possible embodiment, on a path on which the lateral oil spray pipe and the lateral oil transport tank extend in parallel, the lateral oil spray pipe has an extension section beyond an extension length of the lateral oil transport tank, an open opening is disposed on the top of the extension section, and the lubricating oil transported by the lateral oil transport tank further flows to the extension section through the opening, and acts on the to-be-lubricated part along the extension section.

In this embodiment, a part of the lateral oil spray pipe extends beyond the lateral oil transport tank along the extension path, the lubricating oil in the lateral oil transport tank is received by using the open opening on the top of the extra extension section, and the part of lubricating oil acts on the position of the to-be-lubricated part along the extension section. In this embodiment, a structure of the lateral oil transport tank is simplified by disposing the lateral oil transport tank and the lateral oil spray pipe in parallel, and the lubricating oil can be guided only by using the lateral oil spray pipe.

In a possible embodiment, a plurality of first ends are horizontally flush with each other.

In this embodiment, after the oil collection tank is connected to a plurality of lateral oil transport tanks, first ends at tank bottoms of the plurality of lateral oil transport tanks are horizontally flush with each other, to ensure that the lubricating oil in the oil collection tank evenly flows to the lateral oil transport tanks, thereby ensuring a lubrication effect of the lateral oil transport tanks on the to-be-lubricated parts.

In a possible embodiment, the at least one oil spray pipe includes a vertical oil spray pipe, and the vertical oil spray pipe vertically extends away from the sealing chamber. The at least one oil transport tank includes a vertical oil transport tank, the vertical oil transport tank is fastened to a bottom plate of the oil collection tank, and is constructed as a through-tank penetrating through the sealing chamber, and the vertical oil transport tank extends in a same direction as a corresponding vertical oil spray pipe, and is located on a side of the corresponding vertical oil spray pipe.

In this embodiment, corresponding to some to-be-lubricated parts of the gear set that may be located below the oil supply device, the vertical oil spray pipe connected to the sealing chamber and the vertical oil transport tank connected to the oil collection tank are disposed, and the lateral oil transport tank is constructed as the through-tank penetrating through the sealing chamber, to achieve a lubrication effect on the to-be-lubricated part below the oil supply device. In this case, the vertical oil transport tank is located on the side of the vertical oil spray pipe, and the vertical oil transport tank and the vertical oil spray pipe extend toward the to-be-lubricated part below the vertical oil transport tank and the vertical oil spray pipe in parallel.

In a possible embodiment, the vertical oil spray pipe is constructed as an opening disposed at the bottom of the sealing chamber.

In this embodiment, because the to-be-lubricated part is located below the oil supply device, the vertical oil spray pipe is constructed as the opening disposed at the bottom of the sealing chamber, so that at the opening, the sealing chamber can directly transport the lubricating oil to the to-be-lubricated part under an action of gravity.

In a possible embodiment, a quantity of the at least one oil transport tank is more than one, at least one oil guide plate is further disposed on the bottom plate, the at least one oil guide plate divides internal space of the oil collection tank into at least two oil collection regions, a quantity of oil collection regions is the same as the quantity of oil transport tanks, and each oil transport tank is connected to one oil collection region.

In this embodiment, the oil guide plate is used to divide the internal space of the oil collection tank into a plurality of oil collection regions, and each oil transport tank is connected to one oil collection region, to ensure that required lubricating oil is allocated to each oil transport tank and the oil transport tank is lubricated. Different sizes of the oil collection regions are set, to further provide lubrication with different amounts of oil to different to-be-lubricated parts, thereby meeting lubrication requirements of the different to-be-lubricated parts.

In a possible embodiment, the bottom plate includes a first side and a second side that are opposite to each other. When the gear set rotates, the gear set stirs the lubricating oil, and transports the lubricating oil to the oil collection tank from a side that is of the upper opening and that is close to the first side. Straight sections are disposed on all oil guide plates, the straight sections of all the oil guide plates are disposed at positions of the bottom plate that are close to the second side, and the plurality of straight sections are parallel to each other and fastened at intervals.

In this embodiment, because most lubricating oil stirred by the gear set falls into the oil collection tank from a side that is of the upper opening and that is away from the first side, the straight sections are disposed on all the oil guide plates, and the straight sections are parallel to each other and fastened at intervals near the second side, so that the lubricating oil can be allocated to the oil collection regions when entering the oil collection tank, thereby meeting lubrication requirements of different to-be-lubricated parts.

In a possible embodiment, the side plate includes a first side plate close to the first gear and a second side plate opposite to the first side plate, the first side plate has a first height relative to the bottom plate, the second side plate has a second height relative to the bottom plate, and the first height is less than the second height.

In this embodiment, based on the characteristic that the gear set supplies oil through oil stirring, the height of the first side plate that is in the side plate and that is relatively close to the first gear is set to be less than the height of the second side plate that is relatively away from the first gear, so that the lubricating oil can smoothly pass over the first side plate, and fall into the oil collection tank because the lubricating oil is blocked by the second side plate, thereby achieving a better passive lubrication effect.

In a possible embodiment, the side plate further includes a third side plate protruding on the bottom plate, the third side plate is located between the first side plate and the second side plate, the first side plate has the first height relative to the bottom plate, the third side plate has a third height relative to the bottom plate, and the first height is less than the third height.

In this embodiment, the third side plate dedicated to oil blocking is disposed between the first side plate and the second side plate, so that more lubricating oil stirred by the gear set can be collected in the oil collection tank, thereby achieving a better passive lubrication effect.

In a possible embodiment, the bottom plate includes a first side close to the first gear and a second side opposite to the first side, and the second side is vertically located above the first side or flush with the first side.

In this embodiment, the upper opening may be alternatively tilted, by tilting the bottom plate, toward a direction in which oil is supplied, so that more lubricating oil stirred by the gear set is collected in the oil collection tank, thereby achieving a better passive lubrication effect.

In a possible embodiment, the sealing chamber and the oil collection tank are disposed as an integral structure.

In this embodiment, the oil collection tank and the sealing chamber are disposed as an integral structure, the bottom plate of the oil collection tank may be configured to form a top structure of the sealing chamber, and the side plate of the oil collection tank may also be configured to form a side structure of the sealing chamber, to reduce an overall volume of the oil supply device and further adapt to miniaturization of the transmission.

According to a second aspect, this application further provides a vehicle powertrain, including a motor and the transmission provided in the first aspect of this application. The motor is fastened to the transmission, and the motor is configured to drive a gear set in the transmission to rotate.

Because the vehicle powertrain in this application uses the transmission provided in the first aspect of this application, the vehicle powertrain has a better lubrication effect. When the vehicle powertrain runs at a low speed, the gear set is protected through active lubrication, and when the vehicle powertrain runs at a high speed, the gear set is protected through passive lubrication, so that reliability of the vehicle powertrain is improved, and a service life of the vehicle powertrain is prolonged.

In a possible embodiment, a cooling system is further disposed in the vehicle powertrain, and the cooling system is configured to transport lubricating oil in an oil sump to the motor to cool the motor.

In this embodiment, the vehicle powertrain further transports the lubricating oil in the oil sump to the motor by using the cooling system, to cool the motor, and a structure carrying the lubricating oil does not need to be disposed in the motor, so that integration of the vehicle powertrain is improved, and an overall volume of the vehicle powertrain is controlled.

In a possible embodiment, the cooling system includes an oil inlet pipe and an oil return pipe, both the oil inlet pipe and the oil return pipe are connected between the oil sump and the motor, and after flowing to the motor from the oil inlet pipe to complete cooling, the lubricating oil returns to the oil sump through the oil return pipe.

In this embodiment, a circuit of the cooling system is formed by using the oil inlet pipe and the oil return pipe, so that the lubricating oil transported to the motor through the oil inlet pipe can return to the oil sump through the oil return pipe, thereby implementing circulation and exchange of the lubricating oil that is in the motor and that is used for cooling.

In a possible embodiment, the cooling system further includes a heat exchanger, and the heat exchanger is connected in series to the oil return pipe, and is configured to cool the lubricating oil.

In this embodiment, heat exchange and cooling are performed on the lubricating oil by using the heat exchanger connected in series to the oil return pipe, so that after the high-temperature lubricating oil that flows back in the motor is cooled by the heat exchanger, the lubricating oil can return to the oil sump for repeated use, to prevent a temperature of the transmission from rising excessively quickly.

In a possible embodiment, the motor includes a stator and a rotor that cooperate with each other, and the cooling system separately transports the lubricating oil to the stator and the rotor to cool the motor.

In this embodiment, the motor includes the stator and the rotor, and the lubricating oil separately enters the stator and the rotor, to reduce an overall temperature of the motor and achieve a better cooling effect.

According to a third aspect, this application provides a vehicle, including wheels and the vehicle powertrain provided in the second aspect of this application. The vehicle powertrain is configured to drive the wheels to rotate.

It may be understood that because the vehicle powertrain provided in the second aspect of this application has better lubrication and cooling effects, stability of a vehicle in this application is higher, and transmission efficiency when a motor drives the wheels to rotate is improved.

The following describes the technical solutions in embodiments of this application with reference to accompanying drawings in embodiments of this application. It is clear that described embodiments are merely some but not all of embodiments of this application.

Sequence numbers, for example, "first" and "second", of components in this specification are only intended to distinguish between described objects, and do not have any sequence or technical meaning. The term "connection" in this application includes both direct and indirect connections unless otherwise specified. In descriptions of this application, it should be noted that orientation or location relationships indicated by terms "above", "below", "front", "rear", "top", "bottom", "inner", "outer", and the like are orientation or location relationships based on the accompanying drawings, and are merely intended for conveniently describing this application and simplifying descriptions, rather than indicating or implying that an apparatus or an element in question needs to have a specific orientation or needs to be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on this application.

In this application, unless otherwise specified and limited, a first feature is "above" or "below" a second feature may mean that the first feature and the second feature are in direct contact or the first and second features are in indirect contact by using an intermediate medium. In addition, that the first feature is "above" the second feature may be that the first feature is directly above or inclined above the second feature, or only indicates that a level of the first feature is higher than that of the second feature. That the first feature is "below" the second feature may be that the first feature is directly below or inclined below the second feature, or only indicates that a level of the first feature is lower than that of the second feature.

<FIG> shows a vehicle powertrain <NUM> according to an embodiment of this application. The vehicle powertrain <NUM> includes a motor <NUM> and a transmission <NUM>. Relative positions of the motor <NUM> and the transmission <NUM> are fixed, and there is a transmission connection between the motor <NUM> and the transmission <NUM>. As a power source of the vehicle powertrain, the motor <NUM> has a relatively high rotational speed. The transmission <NUM> with a specific reduction ratio needs to be matched to transmit power output by the motor <NUM> to wheels of a vehicle, to drive the vehicle to travel. It may be understood that the vehicle equipped with the vehicle powertrain <NUM> in this application may be an electric vehicle or a hybrid electric vehicle.

Housings are separately disposed for the motor <NUM> and the transmission <NUM>, to protect the motor <NUM> and a movement component inside the motor <NUM> and protect the transmission <NUM> and a movement component inside the transmission <NUM>. A housing of the motor <NUM> and a housing of the transmission <NUM> may be disposed independently of each other, and the housings are connected and fastened after the motor <NUM> and the transmission <NUM> are separately assembled. In other embodiments, the housing of the motor <NUM> and the housing of the transmission <NUM> may be integrally disposed, as shown in <FIG>. The vehicle powertrain <NUM> shown in <FIG> includes a housing <NUM>, and internal components of the motor <NUM> and the transmission <NUM> are accommodated in the housing <NUM>. Because the relative positions of the motor <NUM> and the transmission <NUM> are fixed, the housings of the motor <NUM> and the transmission <NUM> are integrally disposed, so that integration of the vehicle powertrain <NUM> in this application can be improved. In addition, integrally disposing the housing <NUM> further omits a connection component between the housing of the motor <NUM> and the housing of the transmission <NUM>, simplifies a structure of the vehicle powertrain <NUM>, and facilitates miniaturization of the vehicle powertrain <NUM>.

Refer to a schematic diagram of a cross section of the vehicle powertrain <NUM> shown in <FIG>. To clearly indicate an internal structure of the vehicle powertrain <NUM>, a cross-sectional line in a cross-sectional structure is omitted in <FIG>. The motor <NUM> has a stator <NUM> and a rotor <NUM>. The stator <NUM> is fastened to the housing <NUM>, and the rotor <NUM> is rotatably connected to the housing <NUM>. The stator <NUM> is sleeved outside the rotor <NUM>, and the stator <NUM> is configured to drive the rotor <NUM> to rotate. In the schematic diagram of <FIG>, the rotor <NUM> further includes an output section <NUM> protruding from the stator <NUM>, and there is a transmission connection between the output section <NUM> and the transmission <NUM> to transmit power to the transmission <NUM>, so that power output of the motor <NUM> is implemented. In some embodiments, the output section <NUM> may be alternatively constructed as a rotating shaft structure fastened to the rotor <NUM>, and the rotor <NUM> rotates by driving a rotating shaft, to implement a function of outputting rotation power from the output section <NUM> by the motor <NUM>.

In the vehicle powertrain <NUM> in this application, a transmission connection manner between the motor <NUM> and the transmission <NUM> may be implemented in a plurality of manners such as gear engagement transmission, chain transmission, and belt transmission. In the schematic diagram of <FIG>, a gear section <NUM> is further disposed on the output section <NUM> of the rotor <NUM>, a driven gear <NUM> corresponding to the gear section <NUM> is disposed in the transmission <NUM>, and the gear section <NUM> is engaged with the driven gear <NUM>, to implement the transmission connection between the motor <NUM> and the transmission <NUM>.

In an embodiment, as shown in <FIG>, the vehicle powertrain <NUM> in this application further includes a cooling system <NUM>. The cooling system <NUM> is configured to separately implement cooling and lubrication functions on the motor <NUM> and the transmission <NUM>. Specifically, the cooling system <NUM> may be connected to the inside of the motor <NUM>, and transport lubricating oil used for cooling to the motor <NUM>, to implement a cooling function on the motor <NUM>.

The cooling system <NUM> includes an oil inlet pipe <NUM> and an oil return pipe <NUM> that are separately connected to the motor <NUM>. A side (which may also be understood as an inlet end of the oil inlet pipe <NUM>) that is of the oil inlet pipe <NUM> and that is away from the motor <NUM> is connected to a part storing lubricating oil, and a side (which may also be understood as an outlet end of the oil return pipe <NUM>) that is of the oil return pipe <NUM> and that is away from the motor <NUM> is also connected to the part storing lubricating oil. The part storing lubricating oil may be disposed inside the vehicle powertrain <NUM>, or may be disposed as an external oil sump. The lubricating oil needs to have a cooling function. After the lubricating oil flows to the inside of the motor <NUM> through the oil inlet pipe <NUM>, heat exchange is performed between the lubricating oil and the motor <NUM>, and the lubricating oil returns, through the oil return pipe <NUM>, to the part storing lubricating oil, to implement circulation of the lubricating oil and cool the motor <NUM>.

The oil inlet pipe <NUM> and the oil return pipe <NUM> may be independent pipelines, or may be at least partially constructed, as shown in <FIG>, as through-holes disposed inside the housing <NUM>. In this case, the oil inlet pipe <NUM>, the motor <NUM>, and the oil return pipe <NUM> form a lubricating oil circulation circuit. In a working process of the motor <NUM>, a relatively large amount of heat is generated in a process of driving the rotor <NUM> by the stator <NUM>. In the embodiment shown in <FIG>, the lubricating oil transported by the oil inlet pipe <NUM> further flows through the stator <NUM> and the rotor <NUM> to separately cool the stator <NUM> and the rotor <NUM>. The stator <NUM> and the rotor <NUM> are also separately connected to the oil return pipe <NUM>, and the lubricating oil that completes heat exchange is transported to the oil return pipe <NUM>.

In an embodiment, referring back to <FIG>, the cooling system <NUM> further includes a heat exchanger <NUM>. The heat exchanger <NUM> is connected in series to the oil return pipe <NUM>. After being heat-exchanged and cooled by the heat exchanger <NUM>, the lubricating oil that completes heat exchange is transported, through the oil return pipe <NUM>, back to the part storing lubricating oil, to ensure that the lubricating oil stored in the part storing lubricating oil is at a low temperature, and can enter the motor <NUM> through the oil inlet pipe <NUM> again for heat exchange.

In the schematic diagram of <FIG>, a first interface <NUM> and a second interface <NUM> that are configured to connect to the heat exchanger <NUM> are disposed on a path of the oil return pipe <NUM>. The lubricating oil in the oil return pipe <NUM> enters the heat exchanger <NUM> through the first interface <NUM> to implement heat exchange, and receives, through the second interface <NUM>, the lubricating oil obtained after heat exchange of the heat exchanger <NUM>. It should be noted that <FIG> shows only one lubricating oil flowing manner of the cooling system <NUM>. In other embodiments, a flowing path of the lubricating oil in the cooling system <NUM> may be alternatively shown in <FIG>. All through-holes at the cross-sectional position are disposed as the oil inlet pipe <NUM>, and an oil return pipe (not shown in the figure) is disposed at another cross-sectional position to implement circulation of the lubricating oil. Alternatively, in some embodiments, in the cooling system <NUM>, an oil return pipe (not shown in the figure) is disposed at the cross-sectional position, and an oil inlet pipe (not shown in the figure) is disposed at another cross-sectional position, to also achieve a circulation effect of the lubricating oil.

In some embodiments, when the part storing lubricating oil is disposed inside the housing <NUM> of the vehicle powertrain <NUM>, the bottom of the housing <NUM> may be further disposed as an oil sump storing lubricating oil. In this case, only the oil inlet pipe <NUM> may be disposed in the cooling system <NUM>, and the lubricating oil transported to the stator <NUM> or the rotor <NUM> may flow downward under an action of gravity after flowing out of the motor <NUM>, and flow to the oil sump. In other words, in this embodiment, the oil return pipe <NUM> may be omitted, or an inner wall of the housing <NUM> may be considered as the oil return pipe <NUM> as a whole, to guide the lubricating oil to flow to the oil sump. It may be understood that in this embodiment, the heat exchanger <NUM> is preferably disposed above the oil inlet pipe <NUM>, and is configured to cool the lubricating oil in the cooling system <NUM> (as shown in <FIG>). The lubricating oil in the cooling system <NUM> is repeatedly used lubricating oil. Therefore, regardless of a position at which the heat exchanger <NUM> is disposed in the cooling system <NUM>, a cooling function can be implemented on the lubricating oil, and a function implementation of the cooling system <NUM> in this application is not affected.

It should be noted that in the cooling system <NUM> shown in <FIG>, lubricating oil in both a part of the oil inlet pipe <NUM> that supplies oil to the rotor <NUM> and a part of the oil inlet pipe <NUM> that supplies oil to the stator <NUM> flows out from the first interface <NUM> connected to the heat exchanger <NUM>, and the two parts are respectively connected to the rotor <NUM> and the stator <NUM>. In this embodiment, the oil return pipe <NUM> may be connected to the second interface <NUM>, to implement a cooling function of the heat exchanger <NUM> on the lubricating oil. Alternatively, the oil inlet pipe <NUM> may be connected to the second interface <NUM>, to implement a cooling function of the lubricating oil in a process in which the oil inlet pipe <NUM> transports the lubricating oil.

In addition, in the schematic diagram of <FIG>, a direction in which the cooling system <NUM> supplies oil to the rotor <NUM> is from the left side to the right side in the figure, and a direction in which the cooling system <NUM> supplies oil to the stator <NUM> is from the right side to the left side in the figure. In other words, the cooling system <NUM> transports oil to the stator <NUM> and the rotor <NUM> in opposite directions. In some embodiments, when the part storing lubricating oil is located on a side of the motor <NUM>, the cooling system <NUM> may be alternatively configured to separately transport lubricating oil toward the rotor <NUM> and the stator <NUM> in a same direction, to shorten a length of the oil inlet pipe <NUM> and control an overall volume of the vehicle powertrain <NUM> in this application.

Refer to a schematic diagram of an oil circuit of the cooling system <NUM> in the vehicle powertrain <NUM>, shown in <FIG>, in this application. In the schematic diagram of <FIG>, the cooling system <NUM> separately acts on the motor <NUM> and the transmission <NUM>. The transmission <NUM> includes a box body, an inner cavity <NUM> is formed in the box body, and the bottom of the inner cavity <NUM> is constructed as an oil sump <NUM>. The oil sump <NUM> is configured to carry the lubricating oil, in other words, the oil sump <NUM> in this embodiment is used as the part storing lubricating oil. The oil inlet pipe <NUM> and the oil return pipe <NUM> of the cooling system <NUM> are separately connected to the oil sump <NUM>. The oil inlet pipe <NUM> includes a first oil inlet pipe <NUM> and a second oil inlet pipe <NUM>. The first oil inlet pipe <NUM> and the second oil inlet pipe <NUM> may be separately connected to the oil sump <NUM>, or as shown in <FIG>, the first oil inlet pipe <NUM> and the second oil inlet pipe <NUM> first converge outside the oil sump <NUM> and are then connected to the oil sump <NUM>. The oil return pipe <NUM> includes a first oil return pipe <NUM> and a second oil return pipe <NUM>. The first oil return pipe <NUM> and the second oil return pipe <NUM> may be separately connected to the oil sump <NUM>, or as shown in <FIG>, the first oil return pipe <NUM> and the second oil return pipe <NUM> may converge outside the oil sump <NUM> and are then connected to the oil sump <NUM>.

An end that is of the first oil inlet pipe <NUM> and that is away from the oil sump <NUM> is connected to the stator <NUM>, to transport the lubricating oil in the oil sump <NUM> to the stator <NUM> to implement cooling. An end that is of the first oil return pipe <NUM> and that is away from the oil sump <NUM> is also connected to the stator <NUM>, to transport the cooled lubricating oil in the stator <NUM> back to the oil sump <NUM>. An end that is of the second oil inlet pipe <NUM> and that is away from the oil sump <NUM> is connected to the rotor <NUM>, to transport the lubricating oil in the oil sump <NUM> to the rotor <NUM> to implement cooling. An end that is of the second oil return pipe <NUM> and that is away from the oil sump <NUM> is also connected to the rotor <NUM>, to transport the cooled lubricating oil in the rotor <NUM> back to the oil sump <NUM>.

It may be understood that alternatively, the first oil inlet pipe <NUM> and the second oil inlet pipe <NUM> may be separately connected to the heat exchanger <NUM>, to separately transport the lubricating oil flowing back from the stator <NUM> and the rotor <NUM> to the heat exchanger <NUM> for heat exchange. Alternatively, as shown in <FIG>, the first oil inlet pipe <NUM> and the second oil inlet pipe <NUM> first converge and are then connected to the heat exchanger <NUM>, to transport, to the heat exchanger <NUM> for cooling, the lubricating oil to be transported to the motor <NUM>.

In the embodiment shown in <FIG>, an oil pump <NUM> is further disposed above the oil inlet pipe <NUM>, and the oil pump <NUM> is configured to provide power to drive the lubricating oil to circulate between the motor <NUM> and the oil sump <NUM>. It may be understood that the oil pump <NUM> may be alternatively disposed above the oil return pipe <NUM>, or the oil pump <NUM> may be disposed in the heat exchanger <NUM>, to drive the lubricating oil to circulate and continuously cool the motor <NUM>.

In addition, <FIG> further shows a lubricating oil circuit of the cooling system <NUM> for the transmission <NUM>. Synchronously referring to <FIG>, the transmission <NUM> further includes a gear set <NUM>, an oil supply device <NUM>, and an oil transport component <NUM> that are accommodated in the inner cavity <NUM> (refer to <FIG>). Gears in the gear set <NUM> are separately rotatably connected to the box body, and the oil supply device <NUM> is disposed on an upper side of the gear set <NUM>, and is fastened to the box body (the housing <NUM>). In other words, the oil supply device <NUM> is located on a side that is of the gear set <NUM> and that is away from the oil sump <NUM>. The oil supply device <NUM> includes a sealing chamber <NUM> and an oil collection tank <NUM>. The sealing chamber <NUM> is located below the oil collection tank <NUM>. The oil transport component <NUM> includes an oil transport pipeline <NUM> and an oil transport pump <NUM>. One end of the oil transport pipeline <NUM> is connected to the oil sump <NUM>, and the other end of the oil transport pipeline <NUM> is connected to the oil supply device <NUM>. Specifically, referring to <FIG>, the oil transport pipeline <NUM> is connected to the sealing chamber <NUM> of the oil supply device <NUM>. The oil transport pump <NUM> is connected in series to the oil transport pipeline <NUM>, and the oil transport pump <NUM> is configured to transport the lubricating oil to the sealing chamber <NUM> of the oil supply device <NUM> through the oil transport pipeline <NUM>. After receiving the lubricating oil transported by the oil transport component <NUM>, the oil supply device <NUM> may guide the lubricating oil to flow to the gear set <NUM> below the oil supply device <NUM> through a pipeline connected to the sealing chamber <NUM>, to implement lubrication and cooling functions on the gear set <NUM>.

It may be understood that the oil transport component <NUM> and the oil supply device <NUM> in the transmission <NUM> may be understood as a part of the cooling system <NUM>. In a rotation process of the gear set <NUM>, friction occurs, and heat is generated. The lubricating oil may be transported to the gear set <NUM> through cooperation of the oil transport component <NUM> and the oil supply device <NUM>, to reduce internal friction of the gear set <NUM>. The lubricating oil transported to the gear set <NUM> may continue to flow downward to the oil sump <NUM>, and the lubricating oil can take away a part of heat generated by the gear set <NUM>, to achieve a specific cooling effect.

It may be understood that in the transmission <NUM> provided in this embodiment of this application, the box body of the transmission <NUM> is the housing <NUM> shown in <FIG> and <FIG>. In other embodiments, the box body of the transmission <NUM> may be alternatively separately disposed. Because the oil transport component <NUM> is used as a part of the cooling system <NUM>, the oil transport pump <NUM> in the oil transport component <NUM> may be further used as the oil pump <NUM> in the cooling system <NUM>. In other words, the oil transport pipeline <NUM> and the oil inlet pipe <NUM> converge outside the oil sump <NUM>, and the oil transport pump <NUM> is disposed between the oil sump <NUM> and a junction of the oil transport pipeline <NUM> and the oil inlet pipe <NUM>. In a process in which the oil transport pump <NUM> drives the lubricating oil to flow to the oil supply device <NUM> through the oil transport pipeline <NUM>, the oil transport pump <NUM> further synchronously drives the lubricating oil to enter the motor <NUM> through the oil inlet pipe <NUM> to cool the motor <NUM>. It may be understood that in this embodiment, a three-way valve may be disposed at the junction between the oil transport pipeline <NUM> and the oil inlet pipe <NUM>, to split the lubricating oil driven by the oil transport pump <NUM>.

Referring to schematic diagrams of internal structures of the transmission <NUM> shown in <FIG> and <FIG>, the gear set <NUM> includes a driven gear <NUM>, a first gear <NUM>, and a second gear <NUM>. The driven gear <NUM>, the first gear <NUM>, and the second gear <NUM> are separately rotatably connected to the box body of the transmission <NUM>, and the first gear <NUM> and the second gear <NUM> are engaged with each other. The driven gear <NUM> is further fastened to the second gear <NUM>. Specifically, the gear set <NUM> further includes a second gear shaft <NUM>. The second gear shaft <NUM> passes through rotation centers of the driven gear <NUM> and the second gear <NUM>, and is fastened to the driven gear <NUM> and the second gear <NUM>, to fasten the driven gear <NUM> to the second gear <NUM>. After the driven gear <NUM> is driven by the rotor <NUM> to rotate, the second gear <NUM> fastened to the driven gear <NUM> synchronously rotates with the driven gear <NUM>. The second gear <NUM> further transmits the rotation action to the first gear <NUM> through engagement with the first gear <NUM>.

Therefore, in the vehicle powertrain <NUM> in this application, the rotor <NUM> is driven to rotate by using the stator <NUM> of the motor <NUM>, and then rotation power output by the motor <NUM> is transmitted to the first gear <NUM> through engagement of the gear section <NUM> of the rotor <NUM> and the driven gear <NUM> and engagement of the second gear <NUM> and the first gear <NUM>. It can be learned from the schematic diagrams of <FIG> and <FIG> that a quantity of teeth of the gear section <NUM> is less than a quantity of teeth of the driven gear <NUM>, and a quantity of teeth of the second gear <NUM> is also less than a quantity of teeth of the first gear <NUM>. Therefore, a rotational speed of the rotor <NUM> is decelerated through two stages before reaching the first gear <NUM>, and the first gear <NUM> outputs the rotation to a wheel end, so that the transmission <NUM> can be decelerated.

In some embodiments, the second gear <NUM> and the driven gear <NUM> may be alternatively integrally disposed, in other words, the second gear <NUM> may be further used as the driven gear. When being engaged with the first gear <NUM>, the second gear <NUM> is further directly engaged with the gear section <NUM> of the rotor <NUM>. In this case, because the quantity of teeth of the gear section <NUM> is less than the quantity of teeth of the first gear <NUM>, the transmission <NUM> can also be decelerated in this embodiment. In addition, a volume of the transmission <NUM> can be further reduced in an embodiment in which the second gear <NUM> is used as the driven gear, to further reduce the overall volume of the vehicle powertrain <NUM>.

In other embodiments, the gear set <NUM> may further include a third gear (not shown in the figure) and a fourth gear (not shown in the figure). The third gear is fastened to the first gear <NUM>, the third gear is engaged with the fourth gear, and a rotation action of the first gear <NUM> is transmitted to the fourth gear, to achieve a next-stage deceleration effect of the gear set <NUM>. In other words, the first gear <NUM> may be used as an output gear of the gear set <NUM> in the transmission <NUM>, to output rotation power transmitted by the transmission <NUM>; or the first gear <NUM> may be used as a transition gear of the gear set <NUM> in the transmission <NUM>, to achieve a one-stage deceleration effect of the gear set <NUM> through engagement with the second gear <NUM>.

At an end of the second gear <NUM>, in some embodiments, the second gear <NUM> may also implement a transmission connection to the driven gear <NUM> through transition of a pair of intermediate gears. In other words, a quantity of gears of the gear set <NUM> in the transmission <NUM> in this application is not limited, and a quantity of transmission stages in the gear set <NUM> is not limited, either. The gear set <NUM> can be lubricated and cooled through cooperation of the oil supply device <NUM> and the oil transport component <NUM>.

Still referring to the internal structures of the transmission <NUM> shown in <FIG> and <FIG>, the gear set <NUM> further includes a first gear shaft <NUM>, a first bearing <NUM>, and a second bearing <NUM>. The first gear shaft <NUM> passes through a rotation center of the first gear <NUM>, and is fastened to the first gear <NUM>. There are two first bearings <NUM>, and the two first bearings <NUM> are fastened on both sides of the first gear <NUM> in a length direction of the first gear shaft <NUM>. In other words, the first gear <NUM> is located between the two first bearings <NUM> in the length direction of the first gear shaft <NUM>. The first bearing <NUM> includes a first bearing stator <NUM> and a first bearing rotor <NUM>, and the first bearing rotor <NUM> may rotate within the first bearing stator <NUM>. Each first bearing stator <NUM> is fastened to the box body of the transmission <NUM>, and each first bearing rotor <NUM> is fastened to the first gear shaft <NUM>. Therefore, the first gear shaft <NUM> can be rotatably connected to the box body through rotation of the two first bearing rotors <NUM> relative to the first bearing stators <NUM>. The first gear <NUM> is fastened to the first gear shaft <NUM>, so that the first gear <NUM> is rotatably connected to the box body of the transmission <NUM> through cooperation of the first gear shaft <NUM> and the first bearing <NUM>.

In the schematic diagram of <FIG>, the first gear shaft <NUM> is constructed as a U-shaped support structure, and includes a support part <NUM> fastened to the first bearing <NUM> and connection parts <NUM> separately arranged on both sides of the support part <NUM>. The two connection parts <NUM> are separately fastened to the first gear <NUM>, to fasten the first gear shaft <NUM> to the first gear <NUM>.

There are also two second bearings <NUM>. In a length direction of the second gear shaft <NUM>, the two second bearings <NUM> are fastened on both sides of the second gear <NUM>, and are also fastened on both sides of the driven gear <NUM>. In other words, both the second gear <NUM> and the driven gear <NUM> are located between the two second bearings <NUM> in the length direction of the second gear shaft <NUM>. The second bearing <NUM> includes a second bearing stator <NUM> and a second bearing rotor <NUM>, and the second bearing rotor <NUM> may rotate within the second bearing stator <NUM>. Each second bearing stator <NUM> is fastened to the box body of the transmission <NUM>, and each second bearing rotor <NUM> is fastened to the second gear shaft <NUM>. Therefore, the second gear shaft <NUM> can be rotatably connected to the box body through rotation of the two second bearing rotors <NUM> relative to the second bearing stators <NUM>. The second gear <NUM> is fastened to the second gear shaft <NUM>, so that the second gear <NUM> is rotatably connected to the box body of the transmission <NUM> through cooperation of the second gear shaft <NUM> and the second bearing <NUM>.

Engagement transmission between the first gear <NUM> and the second gear <NUM> causes friction between the first gear <NUM> and the second gear <NUM>. In addition, a higher rotational speed output by the motor <NUM> indicates a larger friction force generated between the first gear <NUM> and the second gear <NUM> and a larger amount of generated heat. Further, within the first bearing <NUM> and the second bearing <NUM>, in a process of high-speed rotation of the first gear <NUM> and the second gear <NUM>, a friction force between the first bearing stator <NUM> and the first bearing rotor <NUM> and a friction force between the second bearing stator <NUM> and the second bearing rotor <NUM> also synchronously increase, leading to a rise of heat separately generated by the first bearing <NUM> and the second bearing <NUM>.

The lubricating oil transported by the oil supply device <NUM> to the gear set <NUM> may purposefully act on the foregoing parts at which friction exists and a temperature rises relatively quickly, to reduce, by using a stable oil film formed in an engagement part (defined as a first engagement part) of the first gear <NUM> and the second gear <NUM>, the inside of the first bearing <NUM>, and the inside of the second bearing <NUM>, wear caused by metal friction, so that transmission efficiency of the gear set <NUM> is improved, thereby improving reliability of the transmission <NUM> and prolonging a service life of the transmission <NUM>. In this embodiment, the first engagement part, a position of the first bearing <NUM>, and a position of the second bearing <NUM>, and the like that are in the gear set <NUM> and at which friction exists and a temperature rises relatively quickly are defined as to-be-lubricated parts of the gear set <NUM>. That the oil supply device <NUM> supplies the lubricating oil to the gear set <NUM> means that the oil supply device <NUM> supplies the lubricating oil to the to-be-lubricated parts of the gear set <NUM>.

It may be understood that when the gear set <NUM> further includes the third gear and the fourth gear, the third gear is engaged with the fourth gear at a second engagement part, and the oil supply device <NUM> may further correspondingly transport the lubricating oil to the second engagement part. Alternatively, when the gear set <NUM> further includes a third bearing (not shown in the figure) and a fourth bearing (not shown in the figure), the oil supply device <NUM> may also correspondingly transport the lubricating oil to the third bearing and the fourth bearing. In other words, other parts at which a friction force exists in the gear set <NUM> may also be defined as to-be-lubricated parts, and to-be-lubricated parts of the gear set <NUM> may cover the foregoing parts at which a temperature rises because of friction, but are not limited to the foregoing parts. In other embodiments, a to-be-lubricated part may be alternatively randomly specified in the gear set <NUM> as actually required, and the oil supply device <NUM> lubricates and cools the specified to-be-lubricated part.

It should be noted that, to lubricate the inside of the first bearing <NUM> and the inside of the second bearing <NUM>, the oil supply device <NUM> may transport the lubricating oil from a side surface of a junction between the first bearing stator <NUM> and the first bearing rotor <NUM> and from a side surface of a junction between the second bearing stator <NUM> and the second bearing rotor <NUM>, to respectively lubricate the inside of the first bearing <NUM> and the inside of the second bearing <NUM>. In other embodiments, the oil supply device <NUM> may also supply the lubricating oil to the top of the first bearing <NUM> and the top of the second bearing <NUM>, to implement penetration of the lubricating oil into the first bearing rotor <NUM> and the second bearing rotor <NUM> through an opening (not shown in the figure) on the top of the first bearing stator <NUM> and an opening (not shown in the figure) on the top of the second bearing stator <NUM>, to respectively lubricate the inside of the first bearing <NUM> and the inside of the second bearing <NUM>.

In this application, the oil supply device <NUM> can implement an active lubrication function on the gear set <NUM> through the connection between the sealing chamber <NUM> and the oil transport component <NUM>. In addition, the oil collection tank <NUM> in the oil supply device <NUM> can implement a passive lubrication function on the gear set <NUM>. Referring to <FIG>, on a side that is of the first gear <NUM> and that is away from the second gear <NUM>, the first gear <NUM> is further spaced from the inner cavity <NUM> of the box body to form an oil stirring channel <NUM>. Specifically, the inner cavity <NUM> of the box body includes a first side wall <NUM> and a top wall <NUM>. The first side wall <NUM> is located on the side that is of the first gear <NUM> and that is away from the second gear <NUM>, and the first side wall <NUM> is spaced from the first gear <NUM>. The top wall <NUM> is located above the first side wall <NUM>, and is connected to the first side wall <NUM>. The top wall <NUM> is also spaced from the first gear <NUM>. Both the first side wall <NUM> and the top wall <NUM> that are connected are spaced from the first gear <NUM> to form the oil stirring channel <NUM>.

Further, the bottom of the first gear <NUM> is further located in the oil sump <NUM>, and a liquid level of the lubricating oil carried in the oil sump <NUM> is higher than the bottom of the first gear <NUM>, so that the bottom of the first gear <NUM> is immersed in the lubricating oil. The side that is of the first gear <NUM> and that is away from the second gear <NUM> rotates from the bottom of the first gear <NUM> to the top of the first gear <NUM>. Therefore, in a working process, the first gear <NUM> may continuously bring the lubricating oil in the oil sump <NUM> into the oil stirring channel <NUM>. After a rotational speed of the first gear <NUM> reaches or exceeds a specific threshold (for example, <NUM> revolutions per minute), the first gear <NUM> may stir the lubricating oil to move in the oil stirring channel <NUM>.

The oil supply device <NUM> is located on a side that is of the gear set <NUM> and that is away from the oil sump <NUM>, and the oil collection tank <NUM> of the oil supply device <NUM> is disposed at the end of the oil stirring channel <NUM>, in other words, the oil supply device <NUM> is disposed corresponding to the oil stirring channel <NUM>, so that the oil collection tank <NUM> faces the oil stirring channel <NUM>, and collects the lubricating oil. After the rotational speed of the first gear <NUM> exceeds a specific threshold, the lubricating oil stirred by the first gear <NUM> by using the oil stirring channel <NUM> falls into the oil collection tank <NUM>, and then the lubricating oil is guided to flow to the gear set <NUM> below the oil collection tank <NUM> through a pipeline connected to the oil collection tank <NUM>, to implement a passive lubrication function on the gear set <NUM>.

In the embodiment of <FIG>, the oil stirring channel <NUM> extends over the top of the first gear <NUM> toward a side of the second gear <NUM>. In this case, the oil supply device <NUM> is further located on a side that is of the first gear <NUM> and that is close to the second gear <NUM>, and a height of the oil supply device <NUM> is less than a height of the top of the first gear <NUM>. Because the side that is of the first gear <NUM> and that is away from the second gear <NUM> rotates from the bottom to the top of the first gear <NUM>, the side that is of the first gear <NUM> and that is close to the second gear <NUM> rotates from top to bottom. It may be understood that on the side that is of the first gear <NUM> and that is away from the second gear <NUM>, the lubricating oil in the oil stirring channel <NUM> moves from the oil sump <NUM> to the top wall <NUM>. As the side that is of the first gear <NUM> and that is close to the second gear <NUM> rotates downward, the lubricating oil in the oil stirring channel <NUM> moves from the top wall <NUM> to the oil sump <NUM>. In this case, the height of the oil supply device <NUM> is less than the height of the top of the first gear <NUM>, to ensure that the oil collection tank <NUM> receives the lubricating oil transported through the oil stirring channel <NUM>.

In the embodiment of <FIG>, the top wall <NUM> further includes a first end face <NUM> close to the first side wall <NUM> and a second end face <NUM> opposite to the first end face <NUM>. It may be understood that on a path of the oil stirring channel <NUM>, the lubricating oil moves from a side of the first end face <NUM> to a side of the second end face <NUM>. In other words, the second end face <NUM> is closer to the end of the oil stirring channel <NUM> than the first end face <NUM>, or the second end face <NUM> is closer to the oil collection tank <NUM> than the first end face <NUM>. In an embodiment, the second end face <NUM> is vertically disposed below the first end face <NUM>, to further guide the lubricating oil in the oil stirring channel <NUM> to ensure that the lubricating oil in the oil stirring channels <NUM> flows to the oil collection tank <NUM>.

In addition, at a position at which the bottom of the first gear <NUM> is immersed in the lubricating oil in the oil sump <NUM>, a distance h0 between the liquid level of the lubricating oil in the oil sump <NUM> and the rotation center of the first gear <NUM> is defined to be less than or equal to a radius a1 of a dedendum circle A of the first gear <NUM>. Referring to a partial schematic diagram of <FIG>, in the first gear <NUM>, a dedendum part 2111a of any two transmission teeth <NUM> of the first gear <NUM> is aligned with the dedendum circle A of the first gear <NUM>. The distance h0 between the liquid level of the lubricating oil in the oil sump <NUM> and the rotation center of the first gear <NUM> is set to be less than or equal to the radius a1 of the dedendum circle A of the first gear <NUM>, to ensure that the lubricating oil carried in the oil sump <NUM> at least completely immerses the transmission tooth <NUM> at the bottom of the first gear <NUM>, so that a depth of the first gear <NUM> immersed in the lubricating oil is ensured, thereby ensuring that after the rotational speed of the first gear <NUM> reaches a specific threshold, sufficient lubricating oil can be stirred into the oil supply device <NUM>, and a reliable passive lubrication effect on the gear set <NUM> is achieved.

Therefore, on a side of the transmission <NUM> in this application, the oil supply device <NUM> may receive the lubricating oil supplied by the oil transport component <NUM> and the lubricating oil transported by the first gear <NUM> through the oil stirring channel <NUM>, to respectively implement active lubrication and passive lubrication functions on the gear set <NUM>. The vehicle powertrain <NUM> in this application outputs a rotational speed to drive the vehicle to travel. In addition, a speed of the vehicle changes in the traveling process, and the rotational speed output by the vehicle powertrain <NUM> changes accordingly. The vehicle powertrain <NUM> has a high-speed working condition and a low-speed working condition, and amounts of lubricating oil required by the motor <NUM> and the transmission <NUM> in the two working conditions are different. It may be understood that when the vehicle powertrain <NUM> is in the low-speed working condition, the vehicle powertrain <NUM> generates a relatively small amount of heat, and a lubricating oil requirement is relatively small. In this case, the oil supply device <NUM> can implement active lubrication on the gear set <NUM> with cooperation of the oil transport component <NUM>, and meet a working requirement of the gear set <NUM>. When the vehicle powertrain <NUM> is in the high-speed working condition, the vehicle powertrain <NUM> generates a relatively large amount of heat, and a lubricating oil requirement is relatively large. In this case, the first gear <NUM> with a relatively high rotational speed can transport the lubricating oil in the oil sump <NUM> to the oil supply device <NUM> through the oil stirring channel <NUM>, to achieve a passive lubrication effect.

It may be understood that the low-speed working condition and the high-speed working condition of the transmission <NUM> in this application are compared relative to only a same transmission <NUM>. For different vehicle powertrains <NUM>, a passive lubrication intervention occasion and the oil amount of the transmission <NUM> may be adjusted by using the vehicle powertrain in the solution of this application because of factors such as a power difference between motors <NUM> and a difference in transmission ratios of transmissions <NUM>, to meet working requirements of the different vehicle powertrains <NUM>. For example, the amount of lubricating oil transported to the oil supply device <NUM> by the first gear <NUM> through the oil stirring channel <NUM>, a rotational speed threshold for implementing an oil stirring function by the first gear <NUM>, or the like may be adjusted by setting a capacity of the oil sump <NUM> in the transmission <NUM>, the liquid level of the lubricating oil, a width of the oil stirring channel <NUM> formed between the first gear <NUM> and the inner cavity <NUM>, or the like, so that the passive lubrication intervention occasion and the oil amount of passive lubrication can be adjusted.

Correspondingly, in terms of active lubrication, power of the oil transport pump <NUM> in the oil transport component <NUM> in the vehicle powertrain <NUM> in this application may also be adjusted to correspondingly adjust an amount of lubricating oil of active lubrication, to meet working requirements of different vehicle powertrains <NUM>. It may be understood that in the low-speed working condition, a rotational speed of the gear set <NUM> may be relatively high or relatively low. In this case, the oil transport pump <NUM> may also adjust power of the oil transport pump <NUM>, so that the oil supply device <NUM> can also correspondingly adjust an amount of transported lubricating oil when the rotational speed of the gear set <NUM> is low, to match a synchronous lubrication requirement of the gear set <NUM> in the low-speed working condition. In terms of passive lubrication, because a higher rotational speed of the first gear <NUM> indicates a larger amount of lubricating oil stirred and transported to the oil collection tank <NUM> by the first gear <NUM>, the transmission <NUM> in this application further has a passive lubrication adaptive capability. In other words, the rotational speed of the first gear <NUM> is positively correlated with the amount of lubricating oil received by the gear set <NUM>.

In addition, in the vehicle powertrain <NUM> in the solution of this application, the oil transport pump <NUM> may be controlled in working conditions of different rotational speeds, so that the oil supply device <NUM> performs only active lubrication on the gear set <NUM>, or the oil supply device <NUM> performs only passive lubrication on the gear set <NUM>, or even the oil supply device <NUM> performs both active lubrication and passive lubrication on the gear set <NUM>, to meet lubrication and cooling requirements of the gear set <NUM> at different rotational speeds. In an embodiment, when the vehicle powertrain <NUM> controls a rotational speed of the motor <NUM> to be less than <NUM> revolutions per minute, only the oil transport pump <NUM> is controlled to transport the lubricating oil to the oil supply device <NUM>, to perform active lubrication on the gear set <NUM>. In this case, a rotational speed output by the transmission <NUM> may be less than <NUM> revolutions per minute. When the rotational speed of the motor <NUM> is greater than or equal to <NUM> revolutions per minute, the lubricating oil stirred by the first gear <NUM> can enter the oil collection tank <NUM> through the oil stirring channel <NUM>. In this case, the oil supply device <NUM> lubricates the gear set <NUM> by using the lubricating oil transported through the oil stirring channel <NUM>. When the rotational speed of the motor <NUM> is greater than or equal to <NUM> revolutions, the oil transport pump <NUM> may continue to work, and continuously provide active lubrication to the gear set <NUM>; or the oil transport pump <NUM> may stop working, and the oil supply device <NUM> provides only passive lubrication to the gear set <NUM>.

In some scenarios, the gear set <NUM> may include other parts that need to be only passively or actively lubricated when the transmission <NUM> works, to meet working requirements. For example, the gear set <NUM> includes some parts for which only an oil amount of active lubrication needs to be provided to meet working requirements in both the high-speed working condition and the low-speed working condition of the transmission <NUM>. Alternatively, the gear set <NUM> includes other parts that do not need to be lubricated when the transmission <NUM> is in the low-speed working condition and that need to be passively lubricated when the transmission <NUM> is in the high-speed working condition to meet working requirements. For the foregoing parts of the gear set <NUM>, an oil transport route may be further correspondingly configured for the oil supply device <NUM>, to separately meet working requirements of the parts.

Referring to diagrams of an appearance of an oil supply device <NUM> that is provided in an embodiment of this application and that is shown in <FIG> and <FIG>, the oil supply device <NUM> includes an oil collection tank <NUM> and a sealing chamber <NUM>. The oil collection tank <NUM> is fastened to the sealing chamber <NUM>, and the oil collection tank <NUM> is located above the sealing chamber <NUM>. The inside of the sealing chamber <NUM> is a sealed structure, and an oil inlet port <NUM> and several oil spray pipes <NUM> are further disposed outside the sealing chamber <NUM>. The oil inlet port <NUM> and the several oil spray pipes <NUM> are all connected to the internal sealed structure of the sealing chamber <NUM>. The oil inlet port <NUM> is configured to connect to the oil transport pipeline <NUM> of the oil transport component <NUM>, and the oil transport component <NUM> transports the lubricating oil in the oil sump <NUM> to the sealing chamber <NUM> through the oil transport pipeline <NUM>. The oil spray pipes <NUM> also connected to the sealing chamber <NUM> separately extend away from the sealing chamber <NUM>. Specifically, each oil spray pipe <NUM> extends toward one to-be-lubricated part of the gear set <NUM>. The lubricating oil transported from the oil inlet port <NUM> to the sealing chamber <NUM> causes specific pressure in the closed sealing chamber <NUM>, and is sprayed from the sealing chamber <NUM> through each oil spray pipe <NUM>, to act on each to-be-lubricated part of the gear set <NUM> and to transport the lubricating oil to the to-be-lubricated part. It may be understood that a quantity of oil spray pipes <NUM> may correspond to and match a quantity of to-be-lubricated parts of the gear set <NUM>, in other words, each oil spray pipe <NUM> correspondingly extends toward one to-be-lubricated part of the gear set <NUM>, to achieve an active lubrication effect on all the to-be-lubricated parts of the gear set <NUM>.

The oil collection tank <NUM> includes a bottom plate <NUM> and a side plate <NUM>. The bottom plate <NUM> is fastened to the sealing chamber <NUM>, and the side plate <NUM> is disposed on a periphery of the bottom plate <NUM>, so that an upper opening <NUM> is formed above the bottom plate <NUM>. The upper opening <NUM> is an opening of the oil collection tank <NUM>, and the lubricating oil transported from the oil stirring channel <NUM> enters the oil collection tank <NUM> through the upper opening <NUM>. The oil collection tank <NUM> is also connected to oil transport tanks <NUM>, and a quantity of oil transport tanks <NUM> in the oil supply device <NUM> is the same as the quantity of oil spray pipes <NUM>. The oil transport tanks <NUM> also separately extend away from the oil collection tank <NUM>, and each oil transport tank <NUM> extends toward one to-be-lubricated part of the gear set <NUM>, to transport the lubricating oil collected in the oil collection tank <NUM> to each to-be-lubricated part of the gear set <NUM>.

It may be understood that each oil spray pipe <NUM> extends toward one to-be-lubricated part of the gear set <NUM>, and each oil transport tank <NUM> also extends toward one to-be-lubricated part of the gear set <NUM>. Each oil transport tank <NUM> may be set to extend in parallel to one oil spray pipe <NUM>, to act on one to-be-lubricated part of the gear set <NUM>. In other words, in the oil supply device <NUM> in this application, each oil spray pipe <NUM> and one oil transport tank <NUM> corresponding to the oil spray pipe <NUM> are specified as one group, and the oil spray pipe <NUM> and the oil transport tank <NUM> in the same group extend in a same direction, and act on one to-be-lubricated part of the gear set <NUM>, to transport the lubricating oil. When the oil supply device <NUM> performs active lubrication by using the sealing chamber <NUM>, the oil spray pipe <NUM> extending from the sealing chamber <NUM> to the to-be-lubricated part may transport the lubricating oil transported by the oil transport component <NUM>. When the oil supply device <NUM> performs passive lubrication by using the oil collection tank <NUM>, the oil transport tank <NUM> extending from the oil collection tank <NUM> to the to-be-lubricated part may transport the lubricating oil transported by the first gear <NUM>. Therefore, the oil supply device <NUM> in this application may supply the lubricating oil to each to-be-lubricated part of the gear set <NUM> by disposing a plurality of groups each including one oil spray pipe <NUM> and one oil transport tank <NUM>, and implement active lubrication and passive lubrication on each to-be-lubricated part, to ensure that the gear set <NUM> can be reliably lubricated in both the high-speed working condition and the low-speed working condition, thereby improving transmission efficiency and reliability of the gear set <NUM> and prolonging a service life of the gear set <NUM>.

Referring to a schematic diagram of <FIG>, in an embodiment, the oil spray pipe <NUM> includes a lateral oil spray pipe <NUM>. The lateral oil spray pipe <NUM> horizontally extends away from the sealing chamber <NUM>. The oil transport tank <NUM> includes a lateral oil transport tank <NUM>, and the lateral oil transport tank <NUM> also horizontally extends away from the oil collection tank <NUM>. One lateral oil transport tank <NUM> extends in parallel to one lateral oil spray pipe <NUM>. Because the oil collection tank <NUM> is located above the sealing chamber <NUM>, the lateral oil transport tank <NUM> is also synchronously located above the lateral oil spray pipe <NUM>, and the lateral oil transport tank <NUM> and the lateral oil spray pipe <NUM> extend in parallel toward one to-be-lubricated part of the gear set <NUM>.

In this embodiment, a volume of the oil supply device <NUM> is relatively small, and a volume of the gear set <NUM> is relatively large. Therefore, when the oil supply device <NUM> with the relatively small volume is disposed on the side that is of the gear set <NUM> and that is away from the oil sump <NUM>, some to-be-lubricated parts of the gear set <NUM> may be located at lateral direction positions of the oil collection tank <NUM> and the sealing chamber <NUM>. The horizontally extending lateral oil spray pipe <NUM> and lateral oil transport tank <NUM> are disposed, to implement a lubrication function of the oil supply device <NUM> on the to-be-lubricated parts located at the lateral direction positions.

The lateral oil transport tank <NUM> is connected to the side plate <NUM> of the oil collection tank <NUM>. Referring to a schematic diagram of <FIG>, a gap <NUM> is disposed on the side plate <NUM>, and the lateral oil transport tank <NUM> includes a tank bottom <NUM> and a tank wall <NUM>. The tank bottom <NUM> of the lateral oil transport tank <NUM> is connected to the bottom plate <NUM> of the oil collection tank <NUM>, and horizontally extends toward one part that is of the gear set <NUM> and to which oil is to be supplied. The lateral oil transport tank <NUM> includes two tank walls <NUM>. The two tank walls <NUM> are separately arranged on both sides of the tank bottom <NUM>, and the two tank walls <NUM> are located above the tank bottom <NUM>. The two tank walls <NUM> are separately connected to the side plate <NUM> on opposite sides of the gap <NUM>, and the two tank walls <NUM> further extend, in synchronization with the tank bottom <NUM>, toward the part to which oil is to be supplied. The two tank walls <NUM> and the tank bottom <NUM> jointly direct, to the part to which oil is to be supplied, the lubricating oil flowing out of the oil collection tank <NUM> from the gap <NUM>, and the lubricating oil flows downward from an end that is of the oil transport tank <NUM> and that is away from the oil collection tank <NUM>, to lubricate the part to which oil is to be supplied. Further, the tank bottom <NUM> includes a first end 1242a close to a side of the gap <NUM> and a second end 1242b away from a side of the oil collection tank <NUM>. The second end 1242b is vertically located below the first end 1242a or flush with the first end 1242a. Therefore, in a process in which the oil transport tank <NUM> extends toward the to-be-lubricated part, the tank bottom <NUM> of the oil transport tank <NUM> extends toward the to-be-lubricated part in a direction of tilting downward or horizontally, to ensure a flowing direction of the lubricating oil in the oil transport tank <NUM>, so that the lubricating oil in the oil transport tank <NUM> can smoothly flow from a side of the first end 1242a to a side of the second end 1242b under an action of gravity.

It may be understood that the lateral oil spray pipe <NUM> located below the lateral oil transport tank <NUM> may also be tilted in synchronization with the lateral oil transport tank <NUM>, in other words, an end that is of the lateral oil spray pipe <NUM> and that is away from the sealing chamber <NUM> is vertically located below or flush with an end that is of the lateral oil spray pipe <NUM> and that is close to the sealing chamber <NUM>. In this way, it can also be ensured that the lubricating oil in the lateral oil spray pipe <NUM> flows to the to-be-lubricated part.

In an embodiment, when the oil collection tank <NUM> is connected to a plurality of lateral oil transport tanks <NUM>, a plurality of gaps <NUM> need to be disposed on the side plate <NUM>. A quantity of the plurality of lateral oil transport tanks <NUM> is the same as a quantity of the plurality of gaps <NUM>, and each lateral oil transport tank <NUM> is fastened to one corresponding gap <NUM>, and is connected to the oil collection tank <NUM> by using the gap <NUM>. In an embodiment, tank bottoms <NUM> of the plurality of lateral oil transport tanks <NUM> each have a corresponding first end 1242a. In this case, a plurality of first ends 1242a are preferentially set to be horizontally flush with each other, so that the lubricating oil in the oil collection tank <NUM> can be evenly distributed to the lateral oil transport tanks <NUM>, and the lubricating oil is evenly supplied to the plurality of to-be-lubricated parts of the gear set <NUM>.

Referring to a diagram of a cross-sectional structure of one group including one lateral oil spray pipe <NUM> and one lateral oil transport tank <NUM> that are parallel to each other and that are shown in <FIG>, in an embodiment of <FIG>, both the lateral oil spray pipe <NUM> and the lateral oil transport tank <NUM> extend in a first horizontal direction <NUM>. In the first horizontal direction <NUM>, an extension length of the lateral oil spray pipe <NUM> is less than an extension length of the lateral oil transport tank <NUM>. In this embodiment, because the lateral oil spray pipe <NUM> is connected to the sealing chamber <NUM>, and the lubricating oil in the sealing chamber <NUM> has specific pressure under an action of the oil transport component <NUM>, the lubricating oil flowing out from the lateral oil spray pipe <NUM> has a specific initial speed under an action of the pressure. A direction of the initial speed is parallel to the first horizontal direction <NUM>. However, because the upper opening <NUM> is disposed in the oil collection tank <NUM>, the lubricating oil in the oil collection tank <NUM> flows to the to-be-lubricated part through the lateral oil transport tank <NUM> only under an action of gravity. Therefore, the lubricating oil flowing out from the lateral oil transport tank <NUM> has a relatively small initial speed in the first horizontal direction <NUM>. To ensure that lubricating oil that has a relatively large initial speed and that is output from the lateral oil spray pipe <NUM> can act on the to-be-lubricated part and lubricating oil that has a relatively small initial speed and that is output from the lateral oil transport tank <NUM> can also act on the to-be-lubricated part, an extension length of the lateral oil spray pipe <NUM> in the first horizontal direction <NUM> is appropriately shortened, so that it can be ensured that a drop point of the lubricating oil output from the lateral oil spray pipe <NUM> and a drop point of the lubricating oil output from the lateral oil transport tank <NUM> coincide with each other, and both can accurately act on the to-be-lubricated part.

It should be noted that in the schematic diagram of <FIG>, both the lateral oil spray pipe <NUM> and the lateral oil transport tank <NUM> extend in the first horizontal direction <NUM>. In other embodiments, an extension direction of the lateral oil spray pipe <NUM> and the lateral oil transport tank <NUM> may be an extension direction other than the first horizontal direction <NUM>. Alternatively, paths of the lateral oil spray pipe <NUM> and the lateral oil transport tank <NUM> successively extend in two or more different directions. In this case, a length between an extension structure of the lateral oil spray pipe <NUM> at an end farthest from the sealing chamber <NUM> may be defined to be less than a length of an extension structure of the lateral oil transport tank <NUM> at an end farthest from the oil collection tank <NUM>, to achieve the effect of ensuring that the drop point of the lubricating oil output from the lateral oil spray pipe <NUM> and the drop point of the lubricating oil output from the lateral oil transport tank <NUM> coincide with each other.

For another embodiment, refer to <FIG>. In this embodiment, both the lateral oil spray pipe <NUM> and the lateral oil transport tank <NUM> also extend in the first horizontal direction <NUM>. However, different from the embodiment of <FIG>, in this embodiment, an extension length of the lateral oil spray pipe <NUM> exceeds an extension length of the lateral oil transport tank <NUM>. Specifically, in a schematic diagram of <FIG>, the lateral oil spray pipe <NUM> has an extension section <NUM> beyond the extension length of the lateral oil transport tank <NUM>, and an open opening <NUM> is disposed on the top of the extension section <NUM>. The lubricating oil transported by the lateral oil transport tank <NUM> may flow to the extension section <NUM> through the open opening <NUM>, and continue to flow to the to-be-lubricated part along the extension section <NUM>.

In this embodiment, a lateral oil spray pipe <NUM> and a lateral oil transport tank <NUM> in a same group have a same extension direction, and the lateral oil spray pipe <NUM> is located above the lateral oil transport tank <NUM>. Therefore, the open opening <NUM> is disposed above the lateral oil spray pipe <NUM>, so that the lubricating oil in the lateral oil transport tank <NUM> flows to the extension section <NUM> through the opening <NUM>, and then the lubricating oil in the lateral oil transport tank <NUM> is transported to the to-be-lubricated part through extension of the extension section <NUM> toward the to-be-lubricated part. In other words, in this embodiment, the extension section <NUM> in the lateral oil spray pipe <NUM> is disposed, so that the lubricating oil in the lateral oil transport tank <NUM> converges into the lateral oil spray pipe <NUM> in advance, and then the lubricating oil is transported through the extension section <NUM> in the lateral oil spray pipe <NUM>.

It may be understood that in this embodiment, the extension section <NUM> of the lateral oil spray pipe <NUM> is configured to simultaneously implement lubricating oil transport functions during active lubrication and passive lubrication. In this embodiment, a length of the lateral oil transport tank <NUM> is also shortened, a structure of the oil supply device <NUM> is simplified, and the overall volume of the oil supply device <NUM> is reduced.

In an embodiment, referring to <FIG>, the oil spray pipe <NUM> further includes a vertical oil spray pipe <NUM> (further synchronously refer to <FIG> and <FIG>). The vertical oil spray pipe <NUM> vertically extends away from the sealing chamber <NUM>. The oil transport tank <NUM> includes a vertical oil transport tank <NUM>, and the vertical oil transport tank <NUM> also vertically extends away from the oil collection tank <NUM>. One vertical oil transport tank <NUM> extends in parallel to one vertical oil spray pipe <NUM>. Because the oil collection tank <NUM> is located above the sealing chamber <NUM>, the vertical oil transport tank <NUM> is located on a side of the vertical oil spray pipe <NUM>, and the vertical oil transport tank <NUM> and the vertical oil spray pipe <NUM> extend in parallel toward one to-be-lubricated part of the gear set <NUM>.

In this embodiment, the oil supply device <NUM> may transport, through the vertical oil spray pipe <NUM> and the vertical oil transport tank <NUM>, the lubricating oil to a to-be-lubricated part located below the oil supply device <NUM>. When the oil supply device <NUM> is disposed on the side that is of the gear set <NUM> and that is away from the oil sump <NUM>, some to-be-lubricated parts of the gear set <NUM> may be located below the oil collection tank <NUM> and the sealing chamber <NUM>. The vertically extending vertical oil spray pipe <NUM> and vertical oil transport tank <NUM> are disposed, to implement lubrication of the oil supply device <NUM> for the to-be-lubricated parts located at lower positions.

In an embodiment, as shown in <FIG>, the vertical oil spray pipe <NUM> is constructed as an opening disposed at the bottom of the sealing chamber <NUM>, and the vertical oil transport tank <NUM> is constructed as a through-tank penetrating through the sealing chamber. In addition, the vertical oil transport tank <NUM> is further connected to the bottom plate <NUM> of the oil collection tank <NUM>. In other words, the bottom plate <NUM> of the oil collection tank <NUM> is connected to the vertical oil transport tank <NUM> with a through-tank structure, and the through-tank structure of the vertical oil transport tank <NUM> penetrates through the sealing chamber <NUM>, so that the lubricating oil in the oil collection tank <NUM> can flow downward through the vertical oil transport tank <NUM> with the through-tank structure, and flow to a corresponding to-be-lubricated part through the sealing chamber <NUM>.

It should be noted that for the oil supply device <NUM> in this application, as shown in <FIG>, the oil collection tank <NUM> and the sealing chamber <NUM> may be constructed as two independent components, and are connected and fastened to each other to form the oil supply device <NUM>. In other embodiments, as shown in <FIG>, the oil collection tank <NUM> and the sealing chamber <NUM> may be alternatively disposed as an integral structure. In this case, the bottom plate <NUM> of the oil collection tank <NUM> may be configured to form a top structure of the sealing chamber <NUM>, and the side plate <NUM> of the oil collection tank <NUM> may also extend toward a part below the bottom plate <NUM> to form a side structure of the sealing chamber <NUM>. The oil collection tank <NUM> and the sealing chamber <NUM> are integrally disposed to reduce the overall volume of the oil supply device <NUM>, to adapt to miniaturization of the transmission <NUM>.

In an embodiment, when the gear set <NUM> may include some parts that need to be passively or actively lubricated, correspondingly, an auxiliary oil transport tank (not shown in the figure) or an auxiliary oil spray pipe (not shown in the figure) independent of the oil transport tank <NUM> or the oil spray pipe <NUM> may be further disposed in the oil supply device <NUM>, to supply lubricating oil to the foregoing parts. For example, for a part to which only an oil amount of active lubrication needs to be provided to meet working requirements in both the high-speed working condition and the low-speed working condition of the transmission <NUM>, an auxiliary oil spray pipe connected to the sealing chamber <NUM> may be disposed in the oil supply device <NUM>, and the auxiliary oil spray pipe extends toward the part that needs to be only actively lubricated, to actively lubricate the part. Alternatively, for a part that does not need to be lubricated when the transmission <NUM> is in the low-speed working condition and that needs to be passively lubricated to meet a working requirement when the transmission <NUM> is in the high-speed working condition, an auxiliary oil transport tank connected to the oil collection tank <NUM> may be disposed in the oil supply device <NUM>, and the auxiliary oil transport tank extends toward the part that needs to be only passively lubricated, to passively lubricate the part. The auxiliary oil transport tank and the auxiliary oil spray pipe are respectively disposed independently of the oil transport tank <NUM> and the oil spray pipe <NUM>, so that an applicable scope of the oil supply device <NUM> in this application is further expanded.

In an embodiment, referring to <FIG>, the side plate <NUM> includes a first side plate <NUM> close to the first gear <NUM> and a second side plate <NUM> opposite to the first side plate <NUM>. The first side plate <NUM> has a first height h1 relative to the bottom plate <NUM>, the second side plate <NUM> has a second height h2 relative to the bottom plate <NUM>, and the second height h2 is greater than the first height h1. It may be understood that because the first side plate <NUM> is closer to the first gear <NUM> than the second side plate <NUM>, when the gear set <NUM> rotates, the first gear <NUM> stirs the lubricating oil, and transports the lubricating oil to the oil collection tank <NUM> through the oil stirring channel <NUM> from a side that is of the upper opening <NUM> and that is close to the first side plate <NUM>. The height of the first side plate <NUM> is set to be relatively small, so that it can be ensured that the lubricating oil smoothly passes over the first side plate <NUM> and enters the oil collection tank <NUM>. The height of the second side plate <NUM> is set to be relatively large, so that more lubricating oil can be intercepted at a position away from the first gear <NUM>, so that the lubricating oil falls into the oil collection tank <NUM>, thereby ensuring that an amount of lubricating oil in the oil collection tank <NUM> meets a working requirement of the gear set <NUM>.

It should be noted that the bottom plate <NUM> on a same horizontal plane is used as a reference for both the height of the first side plate <NUM> relative to the bottom plate <NUM> and the height of the second side plate <NUM> relative to the bottom plate <NUM>. In other words, the height of the first side plate <NUM> and the height of the second side plate <NUM> may be understood as absolute heights in a vertical direction, and a reference start point of the absolute height is the horizontal plane on which the bottom plate <NUM> is located. Therefore, in some embodiments, when the bottom plate <NUM> may be tilted or disposed as a step-like structure, it can also be ensured that the height of the second side plate <NUM> is greater than the height of the first side plate <NUM>, so that a better lubricating oil collection effect is achieved.

In an embodiment, referring to <FIG>, the side plate <NUM> also includes a first side plate <NUM> close to the first gear <NUM> and a second side plate <NUM> opposite to the first side plate <NUM>. In addition, the side plate <NUM> further includes a third side plate <NUM> located between the first side plate <NUM> and the second side plate <NUM>. The third side plate <NUM> protrudes on the bottom plate <NUM>, the third side plate <NUM> has a third height h3 relative to the bottom plate <NUM>, and the third height h3 is also greater than the first height h1. In this embodiment, the third side plate <NUM> is disposed to intercept the lubricating oil transported by the first gear <NUM>, to also ensure that an amount of lubricating oil in the oil collection tank <NUM> meets a working requirement of the gear set <NUM>. It may be understood that in this embodiment, the same horizontal plane used as a reference for the height of the first side plate <NUM> relative to the bottom plate <NUM> is also used as a reference for the height of the third side plate <NUM> relative to the bottom plate <NUM>. In other words, the third height h3 of the third side plate <NUM> and the first height h1 of the first side plate <NUM> may also be understood as absolute heights in a vertical direction.

In an embodiment, referring to <FIG>, the bottom plate <NUM> includes a first side <NUM> and a second side <NUM> that are opposite to each other. The first side <NUM> is located near the first gear <NUM>, and the second side <NUM> is located farther from the first gear <NUM>. In addition, the second side <NUM> is vertically flush with the first side <NUM> or higher than the first side <NUM>. In other words, the oil collection tank <NUM> is relatively tilted and fastened in the box body, and a side that is of the tilted oil collection tank <NUM> and that is close to the first gear <NUM> is lower. Similar to the foregoing embodiments of <FIG> and <FIG>, in this embodiment of this application, when the gear set <NUM> rotates, the lubricating oil stirred by the first gear <NUM> is transported to the oil collection tank <NUM> from a side that is of the upper opening <NUM> and that is close to the first side <NUM>. When the second side <NUM> is vertically located above the first side <NUM> or flush with the first side <NUM>, more lubricating oil stirred by the first gear <NUM> falls into the oil collection tank <NUM>, so that an amount of lubricating oil in the oil collection tank <NUM> meets a working requirement of the gear set <NUM>, thereby achieving a better lubrication effect.

It may be understood that, as shown in <FIG>, the bottom plate <NUM> may be constructed as a planar plate structure. In this case, the bottom plate <NUM> needs to be tilted, so that the first side <NUM> is lower than the second side <NUM>, to collect more lubricating oil. Alternatively, as shown in <FIG>, the bottom plate <NUM> may include a first plate body <NUM> and a second plate body <NUM> that are fastened to each other. The first side <NUM> is formed on a side that is of the first plate body <NUM> and that is away from the second plate body <NUM>, and the second side <NUM> is formed on a side that is of the second plate body <NUM> and that is away from the first plate body <NUM>. The first plate body <NUM> is horizontally fastened in the box body, so that the lubricating oil in the oil collection tank <NUM> can flow relatively evenly to the lateral oil transport tanks <NUM>. The second plate body <NUM> is tilted relative to the first plate body <NUM>, to raise the second side <NUM> and collect more lubricating oil.

In an embodiment, referring to <FIG>, a plurality of oil guide plates <NUM> are further disposed on the bottom plate <NUM> (further synchronously refer to <FIG> and <FIG>). The plurality of oil guide plates <NUM> are spaced from each other on the bottom plate <NUM>. The plurality of oil guide plates <NUM> divide internal space of the oil collection tank <NUM> into a plurality of oil collection regions <NUM>. Some of the oil collection regions <NUM> are further connected to different parts of the side plate <NUM>, and at a position that is of the side plate <NUM> and that is connected to each oil collection region <NUM>, the side plate <NUM> has one gap <NUM> corresponding to each oil collection region. The other oil collection regions <NUM> are connected to different vertical oil transport tanks <NUM> on the bottom plate <NUM>. For ease of description, <FIG> shows only some oil collection regions <NUM>. Actually, there are more oil collection regions <NUM> in <FIG>, and each oil transport tank <NUM> is connected to one oil connection region <NUM>.

As mentioned above, each gap <NUM> of the side plate <NUM> is connected to one lateral oil transport tank <NUM>. Therefore, each of the some oil collection regions <NUM> connected to the side plate <NUM> is actually also connected to one lateral oil transport tank <NUM>, and the other oil collection regions <NUM> are connected to the vertical oil transport tanks <NUM>. Therefore, each oil collection region <NUM> obtained through division of the oil guide plates <NUM> is connected to one oil transport tank <NUM>, in other words, each oil transport tank <NUM> is configured to transport lubricating oil in one oil collection region <NUM> to a corresponding part to which oil is to be supplied.

It may be understood that a distance between the oil guide plates <NUM> is adjusted to adjust a size of an area of each oil collection region <NUM>. On the premise that liquid levels of lubricating oil in the oil collection tank <NUM> are consistent, a larger amount of lubricating oil is carried in an oil collection region <NUM> with a larger area, and traffic of lubricating oil transported by an oil transport tank <NUM> connected to the oil collection region <NUM> also increases accordingly. In a working process of the gear set <NUM>, amounts of lubricating oil required by the to-be-lubricated parts may be different. More lubricating oil may be required to lubricate some to-be-lubricated parts with larger gear engagement areas. Therefore, the oil guide plates <NUM> are used to divide the internal space of the oil collection tank <NUM> to obtain oil collection regions <NUM> with different sizes, so that lubricating oil may be allocated based on a requirement of each to-be-lubricated part, thereby further improving a lubrication effect of the oil supply device <NUM> on the gear set <NUM>.

In a possible embodiment, straight sections <NUM> are disposed on all of the plurality of oil guide plates <NUM>, the straight sections <NUM> of the plurality of oil guide plates <NUM> extend to positions of the bottom plate <NUM> that are close to the second side <NUM>, and the plurality of straight sections <NUM> are parallel to each other and fastened at intervals. The straight sections <NUM> of the plurality of oil guide plates <NUM> are parallel to each other and fastened at intervals at the second side <NUM>, so that a plurality of channels for guiding lubricating oil to flow can be formed at the second side <NUM> of the bottom plate <NUM>. It may be understood that each channel is connected to one oil collection region <NUM>, in other words, the plurality of straight sections <NUM> that are parallel to each other and that are fastened at intervals guide the lubricating oil at the second side <NUM>, so that lubricating oil that enters the oil collection tank <NUM> from the side can be guided to each oil collection region <NUM>.

As mentioned above, the lubricating oil transported by the first gear <NUM> to the oil collection tank <NUM> through the oil stirring channel <NUM> needs to pass over the side plate <NUM> at the first side <NUM>, and then falls into the oil collection tank <NUM>. Therefore, most lubricating oil collected by the oil collection tank <NUM> enters the oil collection tank <NUM> from a position close to the second side <NUM>. The straight sections <NUM> are disposed on the oil guide plates <NUM>, and the straight sections <NUM> extend to positions close to the second side <NUM>, so that when most lubricating oil enters the oil collection tank <NUM>, the lubricating oil is split, and lubricating oil obtained after splitting is guided to each oil collection region <NUM>. It may be understood that a distance between the straight sections <NUM> at the second side <NUM> is adjusted to correspondingly adjust an area of lubricating oil that is obtained after splitting and that is transported to each channel, so that lubricating oil that enters the oil collection tank <NUM> from the second side <NUM> is allocated, and different requirements of the to-be-lubricated parts of the gear set <NUM> for an amount of lubricating oil can also be met.

It should be noted that in some embodiments, the straight sections <NUM> may alternatively extend toward the second side plate <NUM> or the third side plate <NUM>, and oil splitting channels on a side that is of the second side plate <NUM> and that is close to the first gear <NUM> or a side that is of the third side plate <NUM> and that is close to the first gear <NUM> are also formed (refer to <FIG>), to implement lubricating oil allocation while intercepting lubricating oil at the second side plate <NUM> or the third side plate <NUM>. In such embodiments, the oil guide plate <NUM> can better guide flow of the lubricating oil in the oil collection tank <NUM>, and it is ensured that lubricating oil collected in each oil collection region <NUM> meets a working requirement of a to-be-lubricated part corresponding to the oil collection region <NUM>.

Claim 1:
A transmission (<NUM>), comprising a box body with an inner cavity and a gear set (<NUM>) and an oil supply device (<NUM>) that are accommodated in the box body, wherein
an oil sump (<NUM>) carrying lubricating oil is disposed at the bottom of the inner cavity;
the oil supply device (<NUM>) is fastened on a side that is of the gear set (<NUM>) and that is away from the oil sump (<NUM>), the oil supply device (<NUM>) comprises a sealing chamber (<NUM>) and an oil collection tank (<NUM>) that are fastened to each other, and the oil collection tank (<NUM>) is located above the sealing chamber (<NUM>);
an oil inlet port (<NUM>) and at least one oil spray pipe (<NUM>) are disposed for the sealing chamber (<NUM>), and the at least one oil spray pipe (<NUM>) extends in different directions; and the sealing chamber (<NUM>) is configured to: receive the lubricating oil that is in the oil sump (<NUM>) and that is transported from the oil inlet port (<NUM>), and spray the lubricating oil to at least one to-be-lubricated part of the gear set (<NUM>) through the at least one oil spray pipe (<NUM>); and
the oil collection tank (<NUM>) has an upper opening, the oil collection tank (<NUM>) is configured to: when the gear set (<NUM>) rotates, receive, by using the upper opening, the lubricating oil that is in the oil sump (<NUM>) and that is stirred and transported by the gear set (<NUM>) , at least one oil transport tank (<NUM>) is further disposed for the oil collection tank (<NUM>), a quantity of oil transport tanks is the same as a quantity of oil spray pipes (<NUM>), and any oil transport tank (<NUM>) is disposed corresponding to one oil spray pipe (<NUM>), and is configured to lubricate a same to-be-lubricated part together with the corresponding oil spray pipe (<NUM>),
wherein the transmission (<NUM>) further comprises an oil transport component (<NUM>), the oil transport component (<NUM>) comprises an oil transport pipeline (<NUM>) and an oil transport pump (<NUM>), one end of the oil transport pipeline (<NUM>) is connected to the oil inlet port of the oil supply device (<NUM>), the other end of the oil transport pipeline (<NUM>) is connected to the oil sump (<NUM>), and the oil transport pump (<NUM>) is configured to pump the lubricating oil in the oil sump (<NUM>) into the sealing chamber (<NUM>) through the oil transport pipeline (<NUM>).