Patent Description:
The present application relates to the technical field of electric devices and, in particular, to a chainsaw according to the preamble of claim <NUM>.

A chainsaw is a power tool mainly used for felling and bucking, which performs a cutting operation on wood through a reciprocating motion of a cutting element. In the chainsaw, the cutting element is generally driven by a motor, and since the cutting element needs to be lubricated or cooled during the reciprocating motion, an oil pump and an oil can need to be disposed inside the chainsaw.

In existing chainsaws, the oil can and the oil pump are generally disposed in the vicinity of the motor, and the motor that drives an output assembly to reciprocate synchronously drives the oil pump. Thus, a transmission assembly with a relatively complex structure needs to be disposed at an output end of the motor to connect the motor, the cutting element, and the oil pump at the same time. However, the transmission assembly includes a relatively large number of transmission pieces and occupies a relatively large space, which results in a relatively large overall size of the chainsaw and is not conducive to miniaturization. a chainsaw according to the preamble of claim <NUM> is known from <CIT>.

According to the invention, a chainsaw according to claim <NUM> is provided.

In an example, the second motor and the liquid pump are both disposed within the grip.

In an example, the oil can is at least partially disposed on the front side of the first motor.

In an example, along an operation direction of the chainsaw, the liquid pump and the second motor are arranged substantially in a front and rear direction.

In an example, along the operation direction of the chainsaw, the liquid pump is disposed on the front side of the second motor.

In an example, the liquid pump and the second motor both extend along a preset direction at a preset angle relative to a horizontal direction.

In an example, the chainsaw further includes a battery pack coupling portion for coupling a battery pack.

In an example, the chainsaw further includes a circuit board at least partially disposed within a housing of the battery pack coupling portion.

In an example, the chainsaw further includes a circuit board for controlling both the first motor and the second motor.

In an example, the chainsaw further includes a circuit board disposed between the first motor and at least part of the liquid pump assembly.

In an example, the liquid pump assembly includes an oil tube and a squeezing piece, where the oil tube includes an oil inlet end communicating with the oil can and an oil outlet end extending to the output assembly, and the squeezing piece is configured to squeeze the oil tube into deformation so that lubricating oil within the oil can is transportable to the output assembly through the oil tube.

In an example, the first motor is drivingly connected to the squeezing piece and configured to drive the squeezing piece to rotate about a first straight line to squeeze the oil tube into deformation so that the lubricating oil within the oil can is transported to the output assembly through the oil tube.

In an example, the liquid pump provides pressure for the liquid to flow so that the liquid within the oil can is capable of being released or sucked in, and the liquid pump includes a soft cover made of a flexible material and configured to be deformable to compress the liquid.

In an example, the housing is formed with an accommodation space in which a circuit board is disposed, and the housing is formed with an air inlet and an air outlet communicating with the accommodation space, where the air inlet and the air outlet are both disposed on the front side of the grip in a front and rear direction; and a heat dissipation airflow entering the accommodation space from the air inlet and flowing out from the air outlet flows through the circuit board and the first motor.

In an example, the chainsaw further includes a lower hand guard connected below the grip and a lubrication assembly for lubricating the saw chain, where the lubrication assembly comprises the oil can at least partially disposed or formed within the lower hand guard.

The present application further provides a guide plate extending along a front and rear direction and used for guiding the chain; a first motor for driving the chain to perform the cutting operation; a housing formed with a grip for a user to hold; a liquid pump assembly including a liquid pump and a second motor for driving the liquid pump to operate to lubricate or cool the chain; and an oil can for lubricating the chain. The liquid pump assembly is at least partially disposed within the grip, and according to the invention, the first motor is disposed between the oil can and the liquid pump assembly.

In an example, power of the liquid pump in operation is greater than or equal to <NUM> W and less than or equal to <NUM> W.

In an example, a total length of the chainsaw is greater than or equal to <NUM> and less than or equal to <NUM>.

In an example, an overall weight of the chainsaw with a battery pack mounted is greater than or equal to <NUM> and less than or equal to <NUM>.

In an example, power of the first motor in operation is greater than or equal to <NUM> W and less than or equal to <NUM> W.

Any modification falling within the scope of the claims are also encompassed.

In this application, the terms "up", "down", "left", "right", "front", and "rear" " and other directional words are described based on the orientation or positional relationship shown in the drawings, and should not be understood as limitations to the examples of this application. In addition, in this context, it also needs to be understood that when it is mentioned that an element is connected "above" or "under" another element, it can not only be directly connected "above" or "under" the other element, but can also be indirectly connected "above" or "under" the other element through an intermediate element. It should also be understood that orientation words such as upper side, lower side, left side, right side, front side, and rear side do not only represent perfect orientations, but can also be understood as lateral orientations. For example, lower side may include directly below, bottom left, bottom right, front bottom, and rear bottom. This example provides a power tool. As shown in <FIG>, the power tool includes an output assembly, a first motor <NUM>, a housing <NUM>, and a liquid pump assembly <NUM>. The output assembly is used for implementing an operation. The power tool can have different functions by using different output assemblies. For example, the output assembly may be a chain <NUM> capable of performing a cutting operation so that the power tool has a cutting function. The first motor <NUM> is used for driving the output assembly to operate. The housing <NUM> is formed with a grip <NUM> for a user to hold, and the user may operate the power tool by holding the grip <NUM>. A mounting cavity is formed within the housing <NUM>, and part of the mounting cavity extends into the grip <NUM>. The liquid pump assembly <NUM> is used for cooling or lubricating the output assembly.

In some examples, as shown in <FIG>, in an operation direction of the power tool, the grip <NUM> is disposed behind the output assembly, the grip <NUM> has a cylindrical structure, and a cross-section perpendicular to the operation direction is substantially elliptical, and an extension direction of the grip <NUM> and an extension direction of the output assembly are arranged at an angle, for example, at an obtuse angle greater than <NUM>° and less than <NUM>°. Of course, in other examples, the angle between the extension direction of the grip <NUM> and the extension direction of the output assembly may be set to <NUM>° as required, that is, the grip <NUM> is perpendicular to the output assembly. Alternatively, the angle between the extension direction of the grip <NUM> and the extension direction of the output assembly may be set to <NUM>° as required, that is, the grip <NUM> is collinear with the output assembly. The shape of the grip <NUM> may be adjusted as required so long as the grip <NUM> is convenient for the user to hold to operate the power tool.

Specifically, the liquid pump assembly <NUM> includes a liquid pump <NUM> connected to an oil can <NUM>, where the liquid pump <NUM> is driven to operate to provide pressure for a liquid in the oil can <NUM>, thereby releasing the liquid inside the oil can <NUM> to lubricate or cool the output assembly. It is to be noted that the liquid here may be lubricating oil to lubricate the output assembly and accordingly, the liquid pump <NUM> is an oil pump; or the liquid here may be water to cool the output assembly and accordingly, the liquid pump <NUM> is a water pump. It is to be noted that the liquid is not limited to the lubricating oil or water, and the structure involved in the present application can be used as long as the liquid needs to be released from a reservoir <NUM> of the oil can <NUM> in the chainsaw.

Additionally, the liquid pump <NUM> can not only release the liquid but also suck the liquid, that is, may be used for sucking a certain liquid so that the function implementable with the assistance of the liquid pump <NUM> is not limited to cooling and lubrication.

As shown in <FIG>, the liquid pump assembly <NUM> further includes the oil can <NUM>, a first oil passage <NUM>, and a second oil passage <NUM>. The liquid pump <NUM> has a first opening <NUM> and a second opening <NUM>, where the first opening <NUM> communicates with an end of the first oil passage <NUM>, an oil outlet <NUM> is provided at the other end of the first oil passage <NUM>, the oil outlet <NUM> is disposed in the reservoir <NUM> formed by the output assembly, and the oil outlet <NUM> and the first oil passage <NUM> may be arranged at an angle, for example, perpendicular to each other. In some specific examples, when the power tool is a chainsaw <NUM>, the output assembly includes a guide plate <NUM> and the chain <NUM> moving along the guide plate <NUM>, the reservoir <NUM> may be formed by a sealing ring <NUM> disposed on the guide plate <NUM>, the sealing ring <NUM> abuts against the guide plate <NUM>, and part of the sealing ring <NUM> is embedded into the housing <NUM> and part of the sealing ring <NUM> is higher than the surrounding housing <NUM> to form the reservoir <NUM>. When the chain <NUM> of the chainsaw <NUM> moves along the guide plate <NUM>, different positions of the chain <NUM> pass through the position of the reservoir <NUM> sequentially so that the chain <NUM> can adhere to the liquid in the reservoir <NUM>, thereby lubricating or cooling the chain <NUM> by the liquid.

The second opening <NUM> communicates with the oil can <NUM> through the second oil passage <NUM>. Specifically, the second opening <NUM> is provided with an oil suction port <NUM> for sucking the liquid from the oil can <NUM> into the liquid pump <NUM>. Driven by the liquid pump <NUM>, the lubricating oil or water stored in the oil can <NUM> can enter the liquid pump <NUM> through the second oil passage <NUM> and enter the reservoir <NUM> at the output assembly through the first oil passage <NUM>. When the output assembly works, the liquid in the reservoir <NUM> can lubricate or cool the output assembly or have another effect.

In some more specific examples, the oil can <NUM> is disposed within the grip <NUM>, that is, the oil can <NUM> is disposed in a mounting cavity corresponding to the grip <NUM>. The oil can <NUM> is disposed in the mounting cavity corresponding to the grip <NUM> so that not only can the mounting cavity corresponding to the grip <NUM> be utilized and the weight of the power tool be more balanced, but also the oil can <NUM> can be closer to the liquid pump <NUM> disposed within the grip <NUM> and the required length of the second oil passage <NUM> can be effectively reduced. In an example, the oil can <NUM> is integrated on an inner wall surface of the housing <NUM> so that the oil can <NUM> can be formed while the housing <NUM> is manufactured, thereby avoiding the phenomenon of an accidental detachment of the oil can <NUM>. In an example, the oil can <NUM> is at least partially disposed on the front side of the first motor <NUM>.

In some examples not according to the invention, the liquid pump <NUM> may be driven by the first motor <NUM>, that is, the first motor <NUM> is connected to both the output assembly and the liquid pump <NUM> through transmission assemblies to simultaneously drive the output assembly and the liquid pump <NUM>. Optionally, a gear mechanism, a sprocket mechanism, or the like may be selected as a transmission assembly as required.

In some examples, the chainsaw further includes a second motor <NUM>, a first motor shaft of the second motor <NUM> is directly connected to the liquid pump <NUM>, and the second motor <NUM> is used for driving the liquid pump <NUM> to operate. Compared with the first motor <NUM> for simultaneously driving the output assembly and the liquid pump <NUM>, the independent second motor <NUM> is additionally disposed as a piece for driving the liquid pump <NUM> so that not only can a transmission assembly with a complex structure be omitted, but also it is easier to dispose the second motor <NUM> in the mounting cavity of the housing <NUM> since the second motor <NUM> occupies a small space, facilitating the full use of the space in the housing <NUM> and the miniaturization of the power tool. Specifically, as shown in <FIG>, an end of the second motor <NUM> facing away from the liquid pump <NUM> is provided with a first electrode <NUM> and a second electrode <NUM>, where the first electrode <NUM> and the second electrode <NUM> are electrically connected to a positive electrode and a negative electrode of a power piece, respectively. Still referring to <FIG>, the chainsaw further includes a battery pack coupling portion <NUM> for coupling a battery pack. The battery pack, as the power piece, is electrically connected to the first electrode <NUM> and the second electrode <NUM>. Optionally, the battery pack is detachably connected to the battery pack coupling portion <NUM> to be convenient to detach for replacement or charging. Of course, the battery pack can supply power to the first motor <NUM> in addition to the second motor <NUM>. In addition to the use of the battery pack as the power piece, the first motor <NUM> and the second motor <NUM> may be directly connected to external mains electricity through a power line, thereby achieving power supply.

In an example, still referring to <FIG> and <FIG>, a circuit board <NUM> is disposed at the battery pack coupling portion <NUM>, and the circuit board <NUM> is at least partially disposed within the battery pack coupling portion <NUM>. In an example, the circuit board <NUM> is entirely disposed within the battery pack coupling portion <NUM>. The circuit board <NUM> may be used for controlling the second motor <NUM>. Specifically, an insertion cavity is formed in the battery pack coupling portion <NUM>, and the circuit board <NUM> is inserted into the insertion cavity. The direction in which the battery pack is inserted into the battery pack coupling portion <NUM> is defined as a first direction, and the direction in which the circuit board <NUM> is inserted into the insertion cavity is defined as a second direction. In some examples, the first direction is parallel to the second direction. In some other examples, the first direction and the second direction are arranged at an angle that may be flexibly set according to a space in the battery pack coupling portion <NUM> and is not specifically limited herein.

Of course, the circuit board <NUM> may also be used for controlling the first motor <NUM>. One circuit board <NUM> is used for controlling both the first motor <NUM> and the second motor <NUM> so that one circuit board <NUM> can be omitted, reducing a cost and an occupied space in the housing <NUM>. In this example, the circuit board <NUM> may be a centralized or distributed controller. For example, the controller may be one separate single-chip microcomputer or may be composed of multiple distributed single-chip microcomputers. The single-chip microcomputer can run control programs to control the first motor <NUM> and the second motor <NUM> to implement their functions.

In some more specific examples, as shown in <FIG>, the second motor <NUM> is disposed within the grip <NUM>. The second motor <NUM> is disposed in the mounting cavity corresponding to the grip <NUM> so that a more reasonable layout can be achieved, not only can the mounting cavity corresponding to the grip <NUM> be utilized but also the weight of the power tool can be more balanced, and the user uses the power tool with less labor.

Still referring to <FIG>, in an example, the liquid pump <NUM> is disposed within the grip <NUM>, that is, the liquid pump <NUM> is disposed in the mounting cavity corresponding to the grip <NUM>. Both the liquid pump <NUM> and the second motor <NUM> are disposed in the mounting cavity corresponding to the grip <NUM>, thereby facilitating a direct connection between the second motor <NUM> and the liquid pump <NUM> and avoiding a need to dispose a transmission structure for power transmission between the second motor <NUM> and the liquid pump <NUM>.

In an example, along the operation direction of the chainsaw, the liquid pump <NUM> and the second motor <NUM> are arranged substantially in a front and rear direction. In this manner, the space of the mounting cavity in the grip <NUM> can be fully utilized, and the liquid pump <NUM> and the second motor <NUM> are easy to assemble. In an example, along the operation direction of the chainsaw, the liquid pump <NUM> is disposed on the front side of the second motor <NUM>. In an example, the liquid pump <NUM> and the second motor <NUM> both extend along a preset direction at a preset angle relative to a horizontal direction. It is to be noted that the preset angle here may be an acute angle, an obtuse angle, or a right angle. In an example, the liquid pump <NUM> and the second motor <NUM> may both extend along a vertical direction or along the horizontal direction. In an example, the liquid pump <NUM> may be disposed on the left or right side of the second motor <NUM>.

The specific structure of the liquid pump <NUM> is described below with reference to <FIG>.

As shown in <FIG>, the liquid pump <NUM> includes a pump housing <NUM>, a soft cover <NUM>, an oscillating member <NUM>, an eccentric member <NUM>, a first soft disk <NUM>, a second soft disk <NUM>, a flexible barrier pad <NUM>, and connectors <NUM>.

The pump housing <NUM> is a main protective component and mounting component of the liquid pump <NUM>, and the soft cover <NUM>, the oscillating member <NUM>, the eccentric member <NUM>, the first soft disk <NUM>, the second soft disk <NUM>, and the flexible barrier pad <NUM> are all disposed in the pump housing <NUM>. In this example, since relatively many components need to be mounted in the pump housing <NUM>, the pump housing <NUM> is configured to be a split structure to facilitate assembly and positioning, and a detachable connection is implemented through multiple connectors <NUM>. In an example, the connectors <NUM> are screws, four connectors <NUM> are provided, the pump housing <NUM> is cubic, and the four connectors <NUM> are connected at four corners of the pump housing <NUM>, separately.

Specifically, as shown in <FIG>, <FIG>, the pump housing <NUM> includes a first housing <NUM>, a second housing <NUM>, and a third housing <NUM> connected in sequence. A first chamber is formed between the first housing <NUM> and the second housing <NUM>, and a second chamber is formed between the second housing <NUM> and the third housing <NUM>. It is to be noted that the first chamber and the second chamber can communicate only through holes on the second housing <NUM>, where the holes here refer to a first through hole <NUM> and a second through hole <NUM> shown in <FIG>, which penetrate through the second housing <NUM>. The soft cover <NUM>, the oscillating member <NUM>, the eccentric member <NUM>, the first soft disk <NUM>, and the second soft disk <NUM> are all disposed in the first chamber. The flexible barrier pad <NUM> is disposed in the second chamber. The third housing <NUM> is provided with the first opening <NUM> and the second opening <NUM>.

More specifically, the soft cover <NUM> is made of a flexible material and is deformable to compress the liquid. In the liquid pump <NUM> of the power tool, the soft cover <NUM> deforms to compress the liquid. Since the soft cover <NUM> is made of the flexible material, sealability is improved and oil leakage is avoided. In this example, the soft cover <NUM> is made of soft rubber. Of course, another material may be selected for the soft cover <NUM> according to an actual situation.

Still referring to <FIG>, the soft cover <NUM> includes a first soft cover portion <NUM> and a second soft cover portion <NUM> which are connected to each other, and both the first soft cover portion <NUM> and the second soft cover portion <NUM> are bowl-shaped and can deform alternately under the action of an external force. A first compression cavity <NUM> is formed between the second housing <NUM> and the first soft cover portion <NUM>, and a second compression cavity <NUM> is formed between the second housing <NUM> and the second soft cover portion <NUM>. The liquid pump <NUM> is provided with a first flow channel penetrating through the second housing <NUM> and making the first opening <NUM> communicate with the first compression cavity <NUM> and a second flow channel penetrating through the second housing <NUM> and making the second opening <NUM> communicate with the second compression cavity <NUM>. It is to be noted that the first through hole <NUM> is part of the first flow channel, and the second through hole <NUM> is part of the second flow channel.

The first soft cover portion <NUM> forms the first compression cavity <NUM>, the second soft cover portion <NUM> forms the second compression cavity <NUM>, and the liquid in the first compression cavity <NUM> and the second compression cavity <NUM> can be compressed out or sucked in.

It is to be noted that in this example, the first soft cover portion <NUM> and the second soft cover portion <NUM> form a structure similar to a seesaw. Under the action of the external force, one of the first soft cover portion <NUM> and the second soft cover portion <NUM> is compressed, and the other of the first soft cover portion <NUM> and the second soft cover portion <NUM> is restored to the original bowl shape. When the first soft cover portion <NUM> deforms, the first compression cavity <NUM> is compressed, a volume therein becomes smaller, and pressure therein increases so that the first flow channel is conducted and the second flow channel is blocked. When the second soft cover portion <NUM> deforms, the second compression cavity <NUM> is compressed, a volume therein becomes smaller, and pressure therein increases so that the second flow channel is conducted and the first flow channel is blocked. Additionally, it is to be noted that when one of the first soft cover portion <NUM> and the second soft cover portion <NUM> deforms, the compression cavity corresponding to the deformed soft cover portion <NUM> has a smaller volume and is in a positive pressure state, and the compression cavity corresponding to the soft cover portion <NUM> restored to the original bowl shape has a larger volume and is in a negative pressure state.

To limit and mount the soft cover <NUM>, still referring to <FIG>, the pump housing <NUM> further includes a fourth housing <NUM> disposed between the first housing <NUM> and the second housing <NUM>, where two circular through holes penetrate through the fourth housing <NUM>, and the first soft cover portion <NUM> and the second soft cover portion <NUM> are disposed in the two circular through holes, separately. It is to be explained that the fourth housing <NUM> will not limit the oscillation and deformation of the first soft cover portion <NUM> and the second soft cover <NUM>.

To drive the soft cover <NUM> to oscillate, still referring to <FIG>, the liquid pump <NUM> further includes the oscillating member <NUM> and the eccentric member <NUM>, two ends of the oscillating member <NUM> are connected to the first soft cover portion <NUM> and the second soft cover portion <NUM> separately, and the eccentric member <NUM> is connected to a side of the oscillating member <NUM> facing away from the soft cover <NUM> and can perform an eccentric motion under the action of the external force. In some examples, the eccentric member <NUM> is driven by the first motor <NUM> to perform the eccentric motion. In some parallel examples, the eccentric member <NUM> is driven by the second motor <NUM> to perform the eccentric motion.

As shown in <FIG>, the oscillating member <NUM> includes an oscillating plate <NUM> and a positioning shaft <NUM> connected perpendicularly, the positioning shaft <NUM> is connected to the middle of the oscillating plate <NUM>, the oscillating plate <NUM> is provided with one third connecting hole <NUM> on each of two sides of the positioning shaft <NUM>, and two third connecting holes <NUM> are used for a connecting shaft of the first soft cover portion <NUM> and a connecting shaft of the second soft cover portion <NUM> to pass through, separately. The eccentric member <NUM> is provided with a first connecting hole <NUM> and a second connecting hole <NUM>, where the first connecting hole <NUM> is used for an output shaft <NUM> of the second motor <NUM> to pass through, and the second connecting hole <NUM> is used for the positioning shaft <NUM> of the oscillating member <NUM> in <FIG> to pass through.

To improve the sealability of a first sealed cavity and a second sealed cavity, the liquid pump <NUM> further includes the first soft disk <NUM> and the second soft disk <NUM>. Both the first soft disk <NUM> and the second soft disk <NUM> are disposed on a side of the second housing <NUM> facing the soft cover <NUM>, the first soft disk <NUM> seals at least part of the first compression cavity <NUM> and is staggered from the first flow channel, and the second soft disk <NUM> seals at least part of the second compression cavity <NUM> and is staggered from the second flow channel. In this manner, in a non-working state, the first soft disk <NUM> and the second soft disk <NUM> seal passages through which the liquid flows, that is, the first flow channel and the second flow channel are sealed so that the leakage of the liquid does not easily occur.

To mount the first soft disk <NUM> and the second soft disk <NUM>, the second housing <NUM> is provided with at least two insertion holes, the first soft disk <NUM> and the second soft disk <NUM> are each provided with at least one insertion column, and the insertion column is inserted into an insertion hole so that the first soft disk <NUM> is fixed relative to the second housing <NUM>, and the second soft disk <NUM> is fixed relative to the second housing <NUM>.

To alternately open and close the first flow channel and the second flow channel, the liquid pump <NUM> is further provided with the flexible barrier pad <NUM>. As shown in <FIG>, the flexible barrier pad <NUM> includes a first flexible blocking portion <NUM>, two fixing portions <NUM>, and a second flexible blocking portion <NUM>. In this example, the first flexible blocking portion <NUM>, the two fixing portions <NUM>, and the second flexible blocking portion <NUM> are cross-shaped.

The two fixing portions <NUM> are fixed to the second housing <NUM>. Specifically, as shown in <FIG>, four limiting blocks <NUM> are disposed on an end surface of the second housing <NUM> facing the third housing <NUM>, the four limiting blocks <NUM> are arranged in a rectangular array, one limiting space is formed between two limiting blocks <NUM> in the same row, the two fixing portions <NUM> are limited in two limiting spaces formed by two rows of limiting blocks <NUM> separately, the first flexible blocking portion <NUM> passes through a gap between two limiting blocks <NUM> in one column and is disposed on a side of the four limiting blocks <NUM>, and the second flexible blocking portion <NUM> passes through a gap between two limiting blocks <NUM> in the other column and is disposed on the other side of the four limiting blocks <NUM>. Still referring to <FIG>, a ring-shaped rib <NUM> is provided on an outer side of the four limiting blocks <NUM>, and the four limiting blocks <NUM> and the flexible barrier pad <NUM> are all disposed within the ring-shaped rib <NUM>.

The first flexible blocking portion <NUM> may selectively open and close the first flow channel. Specifically, the first through hole <NUM> is disposed at a position of the second housing <NUM> directly facing the first flexible blocking portion <NUM>, and the first flexible blocking portion <NUM> blocks or opens the first through hole <NUM> to block or conduct the first flow channel. The second flexible blocking portion <NUM> may selectively open and close the second flow channel. Specifically, the second through hole <NUM> is disposed at a position of the second housing <NUM> directly facing the second flexible blocking portion <NUM>, and the second flexible blocking portion <NUM> blocks or opens the second through hole <NUM> to block or conduct the second flow channel.

A working process of the liquid pump <NUM> is specifically described below.

The second motor <NUM> is powered on and drives the eccentric member <NUM> to perform the eccentric motion, the eccentric member <NUM> can drive, during rotation, the oscillating member <NUM> to oscillate, and the oscillating member <NUM> alternately compresses the first soft cover portion <NUM> and the second soft cover portion <NUM> of the soft cover <NUM> during oscillation so that the first compression cavity <NUM> and the second compression cavity <NUM> are alternately compressed and reset, the compressed compression cavity is in the positive pressure state, and the reset compression cavity is in the negative pressure state.

When the first compression cavity <NUM> is in the positive pressure state and the second compression cavity <NUM> is in the negative pressure state, gas in the first compression cavity <NUM> passes through the first through hole <NUM> of the second housing <NUM> and blows the first flexible blocking portion <NUM> of the flexible barrier pad <NUM> so that the first flexible blocking portion <NUM> is released from blocking the first through hole <NUM>. At this time, the first flow channel is conducted, and the liquid in the liquid pump <NUM> can be pressed through the first oil passage <NUM> into the reservoir <NUM> formed by the output assembly. Since the second compression cavity <NUM> is in the negative pressure state, the second flexible blocking portion <NUM> of the flexible barrier pad <NUM> always blocks the second through hole <NUM> under the action of external air pressure, and the second flow channel is blocked.

When the second compression cavity <NUM> is in the positive pressure state and the first compression cavity <NUM> is in the negative pressure state, gas in the second compression cavity <NUM> passes through the second through hole <NUM> of the second housing <NUM> and blows the second flexible blocking portion <NUM> of the flexible barrier pad <NUM> so that the second flexible blocking portion <NUM> is released from blocking the second through hole <NUM>. At this time, the second flow channel is conducted, and the liquid in the oil can <NUM> can be sucked into the liquid pump <NUM>. Since the first compression cavity <NUM> is in the negative pressure state, the first flexible blocking portion <NUM> of the flexible barrier pad <NUM> always blocks the first through hole <NUM> under the action of external air pressure, and the first flow channel is blocked.

In an example, still referring to <FIG>, the power tool further includes a switch <NUM> disposed below the housing, and the user may flexibly operate the switch <NUM> when holding the grip <NUM> to power on or power off the whole power tool. Still referring to <FIG>, the power tool further includes a shield <NUM> disposed above the output assembly to prevent debris generated during operation of the output assembly from flying arbitrarily, thereby improving the safety of use of the power tool.

It is to be noted that the second motor <NUM> and the liquid pump <NUM> are integrated into the liquid pump assembly <NUM>, and the second motor <NUM> and the liquid pump <NUM> in the liquid pump assembly <NUM> may mate with each other as described in this example, or a transmission structure may be added between the second motor <NUM> and the liquid pump <NUM> so that the second motor <NUM> and the liquid pump <NUM> may be spaced apart by a distance. Therefore, as shown in <FIG>, the liquid pump assembly <NUM> may be disposed on a side of the inside of the grip <NUM> facing the battery pack coupling portion <NUM>, or the second motor <NUM> and the liquid pump <NUM> may be disposed on two sides separately in the grip <NUM>.

In an example, the liquid pump assembly <NUM> is disposed between the switch <NUM> and the circuit board <NUM>. In an example, the liquid pump assembly <NUM> is disposed between the switch <NUM> and the battery pack coupling portion <NUM>. In an example, the liquid pump assembly <NUM> is disposed between the first motor <NUM> and the battery pack coupling portion <NUM>. In an example, the liquid pump assembly <NUM> is disposed between the first motor <NUM> and the circuit board <NUM>. In an example, at least part of the liquid pump assembly <NUM> may be disposed in the battery pack coupling portion <NUM>.

In this example, the circuit board <NUM> controls the first motor <NUM> and the second motor <NUM>. In an example, the liquid pump assembly <NUM> may be controlled by a separate circuit board distinguished from the circuit board <NUM>.

Based on the preceding example, a new example provides a chainsaw <NUM>. The chainsaw <NUM> includes a chain <NUM>, a guide plate <NUM>, a housing <NUM>, a first motor <NUM>, a liquid pump assembly <NUM>, a battery pack coupling portion <NUM>, a circuit board <NUM>, an oil can <NUM>, a shield <NUM>, and a switch <NUM>. The chain <NUM> implements a cutting operation, the guide plate <NUM> extends along a front and rear direction and is used for guiding the chain <NUM>, the first motor <NUM> is used for driving the chain <NUM> to perform the cutting operation, and the liquid pump assembly <NUM> is used for releasing a liquid to lubricate or cool the chain <NUM>.

It is to be noted that in this example, the chain <NUM>, as an output assembly of the chainsaw <NUM>, can rotate along a circumferential direction of the guide plate <NUM> to cut a target workpiece. Other components (such as the liquid pump assembly <NUM>) than the output assembly are the same as the corresponding components in example one and thus are not repeated here.

As shown in <FIG>, a new example provides a chainsaw including an output assembly <NUM> for implementing an operation, a housing <NUM>, and a drive assembly <NUM>. The output assembly <NUM> is a chain. The housing <NUM> is formed with a grip <NUM> for an operator to hold. Specific details of the grip <NUM> are the same as those of example one and are not repeated here.

The drive assembly <NUM> includes a liquid pump <NUM> and a motor for driving the liquid pump <NUM>. The drive assembly <NUM> is used for releasing or sucking a liquid.

According to the invention, the chainsaw further includes an oil can <NUM>. It is to be noted that the oil can <NUM> is a liquid storage device, and the oil can <NUM> may be used for accommodating lubricating oil or another liquid such as water. In an example, the drive assembly <NUM> is used for lubricating or cooling the output assembly <NUM>.

The drive assembly <NUM> is at least partially disposed within the grip <NUM>. It is to be noted that when a transmission structure is included between the motor for driving the liquid pump <NUM> and the liquid pump <NUM>, the drive assembly <NUM> further includes the transmission structure between the liquid pump <NUM> and the motor for driving the liquid pump <NUM>.

In an example not according to the invention, a first motor <NUM> drives the liquid pump <NUM>, and the first motor <NUM> and the liquid pump <NUM> may be connected by a transmission structure or the liquid pump <NUM> may be directly driven by the first motor <NUM>. According to the invention, a second motor <NUM> drives the liquid pump <NUM>, and the second motor <NUM> and the liquid pump <NUM> may be connected by a transmission structure or the liquid pump <NUM> may be directly driven by the second motor <NUM>. The liquid pump <NUM> may be driven by a combination of multiple motors.

According to the technical solutions disclosed in the present application, in one aspect, compared with the transmission assembly disposed between the first motor and the liquid pump, the second motor drives the liquid pump in the present application, two motors are independently arranged, and the second motor and the liquid pump are integrated so that it is convenient to independently control the liquid pump to release the liquid by the second motor. In another aspect, in the power tool, at least part of the liquid pump assembly is disposed inside the grip formed by the housing so that the space inside the grip is reasonably utilized, and a space occupied by the transmission structure between the first motor and the liquid pump is saved, thereby facilitating the miniaturization of the power tool.

<FIG> show another example of the present application.

This example provides a chainsaw <NUM> for a user to hold with a single hand to perform a cutting operation. As shown in <FIG> and <FIG>, the chainsaw <NUM> includes a housing <NUM>, an output assembly <NUM>, a first motor <NUM>, an oil can <NUM>, and a liquid pump assembly <NUM>. The housing <NUM> is formed with a grip <NUM> for the user to hold. The output assembly <NUM> is connected to the housing <NUM> and used for implementing the cutting operation. The output assembly <NUM> includes a guide plate <NUM> and a saw chain <NUM> disposed around the guide plate <NUM>. The first motor <NUM> is used for supplying power for the saw chain <NUM> to move along the guide plate <NUM> to perform the cutting operation. The oil can <NUM> is used for storing lubricating oil, and the liquid pump assembly <NUM> includes an oil tube and a squeezing piece, where the oil tube includes an oil inlet end communicating with the oil can <NUM> and an oil outlet end extending to the output assembly <NUM>, and the squeezing piece can rotate about a first straight line to squeeze the oil tube into deformation so that the lubricating oil within the oil can <NUM> is transported to the saw chain <NUM> through the oil tube.

The chainsaw <NUM> uses the oil tube and the squeezing piece as the liquid pump assembly <NUM>, and the squeezing piece squeezes the oil tube into deformation so that negative pressure is generated within the oil tube, where the negative pressure can supply power for the lubricating oil to flow. Compared with a diaphragm pump for pumping oil, which causes a relatively large volume of the chainsaw, the liquid pump assembly <NUM> in the example of the present application is small in volume and occupies a small space inside the chainsaw <NUM>, thereby facilitating the miniaturization of the chainsaw <NUM>. Moreover, compared with a plunger pump for pumping oil, which easily causes oil leakage of the chainsaw, the liquid pump assembly <NUM> in the example of the present application can achieve stable oil output so that the oil leakage is not easy to occur.

As shown in <FIG>, the housing <NUM> is a split structure, a first housing half <NUM> and a second housing half <NUM> are spliced into the housing <NUM>, and an inner wall surface of the first housing half <NUM> and an inner wall surface of the second housing half <NUM> surround an accommodation space. The housing <NUM> into which the first housing half <NUM> and the second housing half <NUM> are spliced is manufactured with low difficulty and facilitates the assembly of other components inside and outside the housing <NUM>. Of course, in other examples of the present application, an upper housing and a lower housing or more housing halves may be spliced into the housing <NUM>.

In some examples, as shown in <FIG> and <FIG>, in an operation direction of a power tool, the grip <NUM> is disposed behind the output assembly, the grip <NUM> has a cylindrical structure, and a cross-section perpendicular to the operation direction is substantially elliptical, and an extension direction of the grip <NUM> and an extension direction of the output assembly <NUM> are arranged at an angle, for example, at an obtuse angle greater than <NUM>° and less than <NUM>°. Of course, in other examples, the angle between the extension direction of the grip <NUM> and the extension direction of the output assembly <NUM> may be set to <NUM>° as required, that is, the grip <NUM> is perpendicular to the output assembly <NUM>. Alternatively, the angle between the extension direction of the grip <NUM> and the extension direction of the output assembly <NUM> may be set to <NUM>° as required, that is, the grip <NUM> is collinear with the output assembly <NUM>. The shape of the grip <NUM> may be adjusted as required so long as the grip <NUM> is convenient for the user to hold to operate the chainsaw <NUM>.

Still referring to <FIG>, the guide plate <NUM> of the output assembly <NUM> is mounted at a front end of the housing <NUM> and disposed vertically, and the guide plate <NUM> extends substantially along a front and rear direction. The saw chain <NUM> is sleeved on the guide plate <NUM> and can be guided by the guide plate <NUM> to move around the guide plate <NUM>, and the saw chain <NUM> moves in a vertical plane to perform the cutting operation on a workpiece to be cut. It is to be noted that a region where the output assembly <NUM> is located is a cutting region of the chainsaw <NUM>, and the vertical plane where the saw chain <NUM> is located is a cutting plane of the chainsaw <NUM>. In some examples, the output assembly <NUM> is connected to one side of the housing <NUM>, for example, connected to the left side of the first housing half <NUM> or the right side of the second housing half <NUM>.

As shown in <FIG>, the liquid pump assembly <NUM> further includes an oil inlet tube <NUM> and a lubricating oil tube <NUM>, where an end of the oil inlet tube <NUM> communicates with the oil can <NUM>, and the other end of the oil inlet tube <NUM> communicates with an oil inlet of the oil tube. An oil inlet end of the lubricating oil tube <NUM> communicates with an oil outlet of the oil tube, and an oil outlet end of the lubricating oil tube <NUM> extends to the saw chain <NUM>. In some examples, a reservoir is disposed at the guide plate <NUM>, the oil outlet end of the lubricating oil tube <NUM> is disposed in the reservoir, the reservoir is formed by a sealing ring disposed on the guide plate <NUM>, the sealing ring abuts against the guide plate <NUM>, and part of the sealing ring is embedded into the housing <NUM> and part of the sealing ring is higher than the surrounding housing <NUM> to form the reservoir. When the saw chain <NUM> moves along the guide plate <NUM>, different positions of the saw chain <NUM> pass through the position of the reservoir sequentially so that the saw chain <NUM> can adhere to a liquid in the reservoir, thereby lubricating or cooling the saw chain <NUM> by the liquid.

The first motor <NUM> is disposed within the accommodation space in the housing <NUM>, and an output shaft of the first motor <NUM> is disposed substantially along a horizontal direction, that is, the output shaft of the first motor <NUM> extends in a direction substantially perpendicular to the cutting plane of the output assembly <NUM>. The output shaft of the first motor <NUM> faces the side of the output assembly <NUM>. When the output assembly <NUM> is connected to the left side of the first housing half <NUM>, an output end of the output shaft is disposed on the left side of the first motor <NUM>. In some examples, the first motor <NUM> employs a first servomotor or a first stepper motor. A fan is connected to the other end of the output shaft of the first motor <NUM>, where the fan can synchronously rotate with the output shaft of the first motor <NUM> to achieve heat dissipation of the first motor <NUM>.

In some examples, the chainsaw <NUM> further includes a transmission assembly connected between the output shaft of the first motor <NUM> and the saw chain <NUM>. Specifically, the transmission assembly is a gearbox including a casing, a cover, and a planet gear mechanism, where the planet gear mechanism is disposed in a space defined by the casing and the cover and includes an outer ring gear, a planet carrier, planet gears, and a sun gear, each planet gear is rotatably connected to the planet carrier by a pin shaft, the sun gear meshes with the planet gears, the output shaft of the first motor <NUM> is connected to the sun gear, the outer ring gear is sleeved outside the planet carrier and meshes with the planet gears, a planet carrier shaft of the planet carrier penetrates through the cover and is connected to a sprocket, and the sprocket meshes with the saw chain <NUM>. The output shaft of the first motor <NUM> can output torque and a rotational speed to the sprocket under the deceleration action of the transmission assembly, the rotation of the sprocket can drive the saw chain <NUM> to move, and the saw chain <NUM> in motion can perform the cutting operation on the workpiece to be cut.

In some examples not according to the invention, the first motor <NUM> is drivingly connected to the squeezing piece and used for driving the squeezing piece to rotate about the first straight line. That is to say, the first motor <NUM>, as a unique power source of the single-hand saw chain <NUM>, can drive the output assembly <NUM> and the squeezing piece to simultaneously act.

The squeezing piece includes a sprocket mechanism and a squeezing roller, where the sprocket mechanism includes a driving wheel, a driven wheel, and a chain, the driving wheel is connected to the output shaft of the first motor <NUM>, the driven wheel is rotatably connected in the housing <NUM>, the chain is sleeved on the driving wheel and the driven wheel, an end of the squeezing roller is connected to the chain, and the other end of the squeezing roller is pressed against the oil tube. In some examples, multiple squeezing rollers are provided and spaced apart in an axial direction of the oil tube.

In some examples, the chainsaw <NUM> further includes a second motor, where the second motor is drivingly connected to the squeezing piece and used for driving the squeezing piece to rotate about the first straight line. Compared with the first motor <NUM> for simultaneously driving the output assembly <NUM> and the squeezing piece, the independent second motor is additionally disposed as a piece for driving the squeezing piece so that not only can a transmission assembly with a complex structure be omitted, but also it is easier to dispose the second motor in the housing <NUM> since the second motor occupies a small space, facilitating the full use of the space in the housing <NUM> and the miniaturization of the power tool.

Still referring to <FIG>, the power tool further includes a battery pack coupling portion <NUM> and a battery pack (not shown), where the battery pack coupling portion <NUM> is formed at an end of the grip <NUM> facing away from the output assembly <NUM> and used for coupling the battery pack, and the battery pack is used for supplying electrical energy to all electric components of the chainsaw <NUM>. Optionally, the battery pack is detachably connected to the battery pack coupling portion <NUM> to be convenient to detach for replacement or charging.

In some examples, the battery pack is detachably connected to the battery pack coupling portion <NUM>, that is, the battery pack is connected outside the grip <NUM>. In some examples, the battery pack is disposed in an accommodation space corresponding to the grip <NUM>. The chainsaw <NUM> further includes a trigger for the user to operate. When the user presses the trigger, the first motor <NUM> is electrically connected to the battery pack. In some examples, the trigger is further configured to adjust a rotational speed of the first motor <NUM>.

A circuit board for controlling the second motor is disposed at the battery pack coupling portion <NUM>. The circuit board is at least partially disposed within the battery pack coupling portion <NUM>. In an example, the circuit board is entirely disposed within the battery pack coupling portion <NUM>. Specifically, an insertion cavity is formed in the battery pack coupling portion <NUM>, and the circuit board is inserted into the insertion cavity. Of course, the circuit board may also be used for controlling the first motor <NUM>. One circuit board is used for controlling both the first motor <NUM> and the second motor so that one circuit board can be omitted, reducing a cost and an occupied space in the housing <NUM>. In this example, the circuit board may be a centralized or distributed controller. For example, the controller may be one separate single-chip microcomputer or may be composed of multiple distributed single-chip microcomputers. The single-chip microcomputer can run control programs to control the first motor <NUM> and the second motor to implement their functions.

In some more specific examples, as shown in the figures, the second motor is disposed within the grip <NUM>. The second motor is disposed in a mounting cavity corresponding to the grip <NUM> so that a more reasonable layout can be achieved, not only can the mounting cavity corresponding to the grip <NUM> be utilized but also the weight of the power tool can be more balanced, and the user uses the power tool with less labor.

Still referring to <FIG>, in an example, the liquid pump assembly <NUM> is disposed within the grip <NUM>, that is, the liquid pump assembly <NUM> is disposed in the mounting cavity corresponding to the grip <NUM>. Both the liquid pump assembly <NUM> and the second motor are disposed in the mounting cavity corresponding to the grip <NUM>, thereby facilitating a direct connection between the second motor and the liquid pump assembly <NUM> and avoiding a need to dispose a transmission structure for power transmission between the second motor and the liquid pump assembly <NUM>.

In an example, along the operation direction of the power tool, the liquid pump assembly <NUM> and the second motor are arranged substantially in the front and rear direction. In this manner, the space of the mounting cavity in the grip <NUM> can be fully utilized, and the liquid pump assembly <NUM> and the second motor are easy to assemble. In an example, along the operation direction of the power tool, the liquid pump assembly <NUM> is disposed on the front side of the second motor. In an example, the liquid pump assembly <NUM> and the second motor both extend along a preset direction at a preset angle relative to the horizontal direction. It is to be noted that the preset angle here may be an acute angle, an obtuse angle, or a right angle. In an example, the liquid pump assembly <NUM> and the second motor may both extend along a vertical direction or along the horizontal direction. In an example, the liquid pump assembly <NUM> may be disposed on the left or right side of the second motor.

Still referring to <FIG> and <FIG>, the output assembly <NUM> further includes a lampshade <NUM> fixed above the guide plate <NUM> and the saw chain <NUM> and used for protecting the single-hand saw chain <NUM>. A lighting mechanism is disposed on the lampshade <NUM>. The cutting region is illuminated by the lighting mechanism so that the user can clearly acquire a cutting progress and control a cutting direction, thereby improving cutting quality.

In some examples, the lampshade <NUM> is transparent and made of a transparent material. An outer side surface of the lampshade <NUM> may be sanded or otherwise treated to block light. An inner sidewall of the lampshade <NUM> is inclined to transmit light towards the guide plate <NUM>, or a light guide column is disposed in the lampshade <NUM> to guide light to above the saw chain <NUM>, thereby enhancing a light intensity at the saw chain <NUM> and improving a visual effect.

In some examples, the lighting mechanism is a light-emitting diode (LED) lamp directly controlled by a control mechanism of the chainsaw <NUM>. Under the control of the control mechanism, the LED lamp may be configured to be lit ahead of time. In this example, the control mechanism may be a centralized or distributed controller. For example, the controller may be one separate single-chip microcomputer or may be composed of multiple distributed single-chip microcomputers. The single-chip microcomputer can run control programs to control the LED lamp to implement its function. It is to be noted that the control mechanism and the preceding circuit board may be integrated or may be two independent mechanisms. Of course, in addition to the LED lamp, the lighting mechanism may employ a halogen lamp, a high-pressure sodium lamp, a low-pressure sodium lamp, or another lamp capable of implementing a lighting operation.

In some examples, the lighting mechanism is connected to the battery pack through a wire, and the battery pack supplies electrical energy to the lighting mechanism. In some other examples, the chainsaw <NUM> may also be provided with a solar cell panel on an outer wall surface of the lampshade <NUM>, the lighting mechanism is electrically connected to the solar cell panel, and the lighting mechanism is powered by the solar cell panel. Of course, in addition to the lighting mechanism, the solar cell panel may supply power to other electric components of the chainsaw <NUM>, and the solar cell panel may even completely replace the battery pack if enough electrical energy is supplied.

Generally, the lighting mechanism is disposed on the lampshade <NUM> and rotates synchronously with the lampshade <NUM> to facilitate maintenance and replacement of the lighting mechanism. Of course, in other examples, the lighting mechanism may be fixedly disposed on the housing <NUM> so as not to rotate synchronously with the lampshade <NUM>.

As shown in <FIG>, a new example provides a chainsaw <NUM> including a housing <NUM>, an output assembly <NUM>, a first motor <NUM>, an oil can <NUM>, and a liquid pump assembly <NUM>, where the housing <NUM> is formed with a grip <NUM> for a user to hold; the output assembly <NUM> is connected to the housing <NUM> and includes a guide plate <NUM> and a saw chain <NUM> disposed around the guide plate <NUM>; the first motor <NUM> is used for supplying power for the saw chain <NUM> to move along the guide plate <NUM> to perform a cutting operation; the oil can <NUM> is used for storing lubricating oil; and the liquid pump assembly <NUM> includes a peristaltic pump <NUM>, where the peristaltic pump <NUM> supplies power for the lubricating oil to flow so that a liquid within the oil can <NUM> can be transported to the saw chain <NUM>, and at least part of the peristaltic pump <NUM> is disposed within the grip <NUM>.

The chainsaw <NUM> uses the peristaltic pump <NUM> as a power member of the liquid pump assembly <NUM>. The peristaltic pump <NUM> is relatively small in volume, facilitating a compact structure of the chainsaw <NUM> and the miniaturization of the chainsaw <NUM>. The use of the peristaltic pump <NUM> can solve the problem of unstable oil pumps due to a difficulty in controlling a motion gap and an abrasion problem of an original mechanical pump. The peristaltic pump <NUM> has good structural sealability and good oil pump stability, oil leakage or oil shortage is not easy to occur, and the user has relatively good user experience. It is to be noted that a difference between the chainsaw <NUM> using the peristaltic pump <NUM> as the liquid pump assembly <NUM> and the chainsaw <NUM> using the squeezing piece and a hose <NUM> as the liquid pump assembly <NUM> only lies in the peristaltic pump <NUM>, and other structures are the same and are not repeated here.

The specific structure of the peristaltic pump <NUM> is described below with reference to <FIG> and <FIG>.

As shown in <FIG>, the liquid pump assembly <NUM> further includes an oil inlet tube <NUM> and a lubricating oil tube <NUM>, where an end of the oil inlet tube <NUM> communicates with the oil can <NUM>, and the other end of the oil inlet tube <NUM> communicates with an oil inlet of the peristaltic pump <NUM>. An oil inlet end of the lubricating oil tube <NUM> communicates with an oil outlet of the peristaltic pump <NUM>, and an oil outlet end of the lubricating oil tube <NUM> extends to the saw chain <NUM>.

As shown in <FIG>, the peristaltic pump <NUM> specifically includes a pump housing <NUM>, a pump body <NUM>, a second motor <NUM>, and a hose <NUM>, where the pump body <NUM> is disposed in the pump housing <NUM>, a squeezing channel is formed between the pump body <NUM> and the pump housing <NUM>, the hose <NUM> is disposed in the squeezing channel, an end of the hose <NUM> communicates with the oil can <NUM> through the oil inlet tube <NUM>, the other end of the hose <NUM> communicates with the oil inlet end of the lubricating oil tube <NUM>, and the second motor <NUM> can drive the pump body <NUM> to rotate to squeeze the hose <NUM>.

The second motor <NUM> can drive the pump body <NUM> to continuously rotate about a second straight line so that the pump body <NUM> continuously performs peristaltic squeezing on the hose <NUM>, and the hose <NUM> is squeezed to generate negative pressure to cause the lubricating oil within the oil can <NUM> to be sucked into the hose <NUM>.

In some examples, the pump housing <NUM> includes an upper cover <NUM> and a lower cover <NUM>, two ends of the lower cover <NUM> are opened, and the upper cover <NUM> covers an opening at the top of the lower cover <NUM>. The pump housing <NUM> is configured to be a split structure of the upper cover <NUM> and the lower cover <NUM> so that the pump body <NUM> and the hose <NUM> are easy to assembly in the pump housing <NUM>, and the pump housing <NUM> is easy to manufacture.

In some examples, the peristaltic pump <NUM> further includes a deceleration mechanism <NUM>, and an output shaft of the second motor <NUM> is connected to the pump body <NUM> through the deceleration mechanism <NUM>. In some specific examples, the deceleration mechanism <NUM> is a gear structure or a planet gear structure.

In some examples, the pump body <NUM> includes two disks <NUM> spaced apart and arranged in parallel, a mounting column disposed between the two disks <NUM>, and a squeezing roller <NUM> rotatably sleeved on the mounting column, where the squeezing roller <NUM> is used for squeezing the hose <NUM>, an output end of the deceleration mechanism <NUM> is connected to one of the disks <NUM>, and a line between the centers of the two disks <NUM> is the second straight line.

Driven by the second motor <NUM> and the deceleration mechanism <NUM>, the pump body <NUM> can rotate about the second straight line, and the squeezing roller <NUM> is in contact with the hose <NUM> and moves along the direction of a central axis of the hose <NUM> to squeeze the hose <NUM> segment by segment. In some specific examples, multiple mounting columns are disposed between the two disks <NUM>, the multiple mounting columns are arranged in an annular array, and one squeezing roller <NUM> is rotatably sleeved on each mounting column.

In some examples, the peristaltic pump <NUM> further includes a first joint <NUM> and a second joint <NUM> which are both disposed on the pump housing <NUM>, multiple hoses <NUM> are provided, the first joint <NUM> is provided with one first oil inlet and multiple first oil outlets, the second joint <NUM> is provided with one second oil outlet and multiple second oil inlets, the first oil inlet communicates with the oil can <NUM> through the oil inlet tube <NUM>, the second oil outlet communicates with the oil inlet end of the lubricating oil tube <NUM>, and the multiple hoses <NUM> are connected in one-to-one correspondence between the multiple first oil outlets and the multiple second oil inlets. The multiple hoses <NUM> are provided so that an amount of transported lubricating oil can be increased, thereby improving a lubrication effect on the output assembly <NUM>.

<FIG> show a new example of the present application.

As shown in <FIG>, this example provides a chainsaw including a housing <NUM>, an output assembly <NUM>, a first motor <NUM>, a transmission assembly, and a circuit board <NUM>. The housing <NUM> is a main mounting component of the chainsaw, an accommodation space <NUM> is formed in the housing <NUM>, the first motor <NUM>, the transmission assembly, and the circuit board <NUM> are all disposed in the accommodation space <NUM>, and the output assembly <NUM> is mounted at a front end of the housing <NUM>. Specifically, the housing <NUM> includes a motor accommodation portion <NUM> and a grip <NUM>, where the motor accommodation portion <NUM> is used for accommodating the first motor <NUM>, and the grip <NUM> is used for a user to hold. The output assembly <NUM> is used for performing a cutting operation. The first motor <NUM> is disposed in an accommodation space <NUM> corresponding to the motor accommodation portion <NUM> and used for supplying power for the output assembly <NUM> to perform the cutting operation. The transmission assembly is connected between the first motor <NUM> and the output assembly <NUM> and used for power transmission.

The first motor <NUM> and the circuit board <NUM> generate a large amount of heat in a working process. To perform heat dissipation on components including the first motor <NUM> and the circuit board <NUM> in the chainsaw, the housing <NUM> is formed with an air inlet <NUM> and an air outlet <NUM> communicating with the accommodation space <NUM>, where the air inlet <NUM> and the air outlet <NUM> are both disposed on the front side of the grip <NUM> in a front and rear direction, and a heat dissipation airflow entering the accommodation space <NUM> from the air inlet <NUM> and flowing out from the air outlet <NUM> flows through the circuit board <NUM> and the first motor <NUM> to dissipate heat of the circuit board <NUM> and the first motor <NUM>. The front side of the grip may be understood as the front side of a hand holding the grip when the user holds the chainsaw for operation. In some examples, that the heat dissipation airflow flows through the circuit board <NUM> includes that the heat dissipation airflow flows through a surface or the vicinity of the circuit board <NUM>. In some more specific examples, the circuit board <NUM>, the air inlet <NUM>, and the air outlet <NUM> are arranged in sequence in a rear to front direction of a saw chain. Although the heat dissipation airflow entering from the air inlet <NUM> does not flow through the circuit board <NUM> directly, the heat dissipation airflow can still take away the heat of the circuit board <NUM> under the action of negative pressure since the heat dissipation airflow can promote the flow of air in the vicinity of the circuit board <NUM>. Compared with a chainsaw with an air inlet disposed behind a grip in the existing art, the chainsaw provided in the example of the present application has the air inlet <NUM> and the air outlet <NUM> opened on the front side of the grip <NUM> so that when the user holds the grip <NUM> of the chainsaw, the air inlet <NUM> is not blocked, air intake of the air inlet <NUM> is not affected, and the air inlet <NUM> can be configured with a relatively large area, thereby facilitating an improvement of a heat dissipation effect, improving the grip comfort of the user with an overall size reduced, and achieving relatively high heat dissipation efficiency. Of course, in some examples, air inlets may be disposed on both the front side and the rear side of the grip.

As shown in <FIG>, the housing <NUM> is a split structure, a left housing and a right housing are spliced into the housing <NUM>, and an inner wall surface of the left housing and an inner wall surface of the right housing surround the accommodation space <NUM>. The housing <NUM> into which the left housing and the right housing are spliced is manufactured with low difficulty and facilitates the assembly of other components inside and outside the housing <NUM>. Of course, in other examples of the present application, an upper housing and a lower housing or more housings may be spliced into the housing <NUM>.

The output assembly <NUM> includes the saw chain, a guide plate, and an upper shield <NUM>, where the guide plate is mounted at the front end of the housing <NUM> and disposed vertically, the saw chain is sleeved on the guide plate and can be guided by the guide plate to move around the guide plate, and the upper shield <NUM> is fixed above the guide plate and the saw chain and used for protecting the saw chain. The guide plate extends substantially along the front and rear direction. The saw chain moves in a vertical plane to perform the cutting operation on a workpiece to be cut. It is to be noted that a region where the output assembly <NUM> is located is a cutting region of the chainsaw, and the vertical plane where the saw chain is located is a cutting plane of the chainsaw. In some examples, as shown in <FIG>, the output assembly <NUM> is connected to one side of the housing <NUM>, for example, connected to the left side of the left housing or the right side of the right housing.

The first motor <NUM> is disposed in the accommodation space <NUM> corresponding to the motor accommodation portion <NUM> of the housing <NUM>, and an output shaft of the first motor <NUM> is disposed substantially along a horizontal direction, that is, the output shaft of the first motor <NUM> extends in a direction substantially perpendicular to the cutting plane of the output assembly <NUM>. The output shaft of the first motor <NUM> faces the side of the output assembly <NUM>. When the output assembly <NUM> is connected to the left side of the left housing, an output end of the output shaft is disposed on the left side of the first motor <NUM>. In some examples, the first motor <NUM> employs a first servomotor or a first stepper motor. A fan is connected to the other end of the output shaft of the first motor <NUM>, where the fan can synchronously rotate with the output shaft of the first motor <NUM> to achieve heat dissipation of the first motor <NUM>.

The transmission assembly is connected between the output shaft of the first motor <NUM> and the saw chain. Specifically, the transmission assembly is a gearbox including a casing, a cover, and a planet gear mechanism, where the planet gear mechanism is disposed in a space defined by the casing and the cover and includes an outer ring gear, a planet carrier, planet gears, and a sun gear, each planet gear is rotatably connected to the planet carrier by a pin shaft, the sun gear meshes with the planet gears, the output shaft of the first motor <NUM> is connected to the sun gear, the outer ring gear is sleeved outside the planet carrier and meshes with the planet gears, a planet carrier shaft of the planet carrier penetrates through the cover and is connected to a sprocket, and the sprocket meshes with the saw chain. The output shaft of the first motor <NUM> can output torque and a rotational speed to the sprocket under the deceleration action of the transmission assembly, the rotation of the sprocket can drive the saw chain to move, and the saw chain in motion can perform the cutting operation on the workpiece to be cut.

In some examples, the air inlet <NUM> is disposed on a side of the motor accommodation portion <NUM> facing away from the cutting region of the output assembly <NUM>, and the air outlet <NUM> is disposed on a side of the motor accommodation portion <NUM> facing the cutting region of the output assembly <NUM>. In this manner, debris generated during the cutting operation of the chainsaw can be prevented from being sucked into the chainsaw through the air inlet <NUM>. Of course, in some other examples, the air inlet <NUM> and the air outlet <NUM> may be arranged up and down in a vertical direction, for example, the air inlet <NUM> is disposed above the air outlet <NUM>, or the air outlet <NUM> is disposed above the air inlet <NUM>.

Still referring to <FIG>, the motor accommodation portion <NUM> of the housing <NUM> has an annular sidewall <NUM> protruding relative to the grip <NUM>, the air inlet <NUM> is opened on a side of the annular sidewall <NUM> facing the grip <NUM>, and the air outlet <NUM> is opened on a side of the annular sidewall <NUM> facing away from the grip <NUM>. In this manner, the air inlet <NUM> is disposed rearward, and the air outlet <NUM> is disposed forward, thereby facilitating the flow of air into and out of the chainsaw to form the heat dissipation airflow and an increase of an air inlet area of the air inlet <NUM> and an air outlet area of the air outlet <NUM>.

In some examples, the air inlet <NUM> and the air outlet <NUM> are disposed on the same housing of the housing <NUM> and disposed on the same side of the chainsaw as the fan in the housing <NUM>, the fan is sleeved on the output shaft of the first motor <NUM> and can rotate with the output shaft, and the air inlet <NUM> and the air outlet <NUM> are disposed on two sides of the fan. In this manner, a flowrate of the heat dissipation airflow can be increased, thereby improving the heat dissipation effect. It is to be noted that the transmission assembly and the fan are connected to two sides of the output shaft of the first motor <NUM>.

Still referring to <FIG>, the circuit board <NUM> is adjacent to the first motor <NUM>, and the circuit board <NUM> is disposed on a side of the first motor <NUM> facing the grip <NUM>. The circuit board <NUM> is disposed in the vicinity of the first motor <NUM> so that the heat dissipation effect on the circuit board <NUM> can be improved, and the overall size of the chainsaw can be reduced, thereby facilitating the miniaturization of the chainsaw. In some examples, a driver circuit electrically connected to the first motor <NUM> and a controller are disposed on the circuit board <NUM> so that the first motor <NUM> can be controlled through the circuit board <NUM>.

Referring to <FIG> and <FIG>, the chainsaw in this example further includes a battery pack <NUM> for supplying electrical energy to the chainsaw. Specifically, the battery pack <NUM> is detachably connected to the chainsaw and disposed in a space formed by the grip <NUM>. The chainsaw further includes a trigger <NUM> for the user to operate. When the user presses the trigger <NUM>, the first motor <NUM> is electrically connected to the battery pack <NUM>. In some examples, the trigger <NUM> is further configured to adjust a rotational speed of the first motor <NUM>. In the preceding example, the air inlet is disposed on the front side of the grip, facilitating a decrease of the distance from the trigger <NUM> to a rear end of the battery pack <NUM>. In this example, the air inlet <NUM> is at least partially disposed on the front side of the trigger <NUM> in the front and rear direction.

Still referring to <FIG>, the chainsaw further includes the battery pack <NUM>, and the battery pack <NUM> is disposed in an accommodation space <NUM> corresponding to the grip <NUM>. The circuit board <NUM> is disposed between the first motor <NUM> and the battery pack <NUM>. Of course, in some examples, the battery pack <NUM> may be detachably connected outside the grip <NUM>.

Still referring to <FIG>, the chainsaw further includes a lubrication assembly <NUM>, where the lubrication assembly <NUM> is used for lubricating the chainsaw and includes an oil can <NUM>, an oil pump <NUM>, an oil suction tube <NUM>, and an oil discharge tube <NUM>, the oil can <NUM> is used for containing lubricating oil, the oil pump <NUM> is used for supplying power for the lubricating oil to flow, an end of the oil suction tube <NUM> communicates with an oil inlet of the oil pump <NUM>, the other end of the oil suction tube <NUM> extends into the oil can <NUM>, an end of the oil discharge tube <NUM> communicates with an oil outlet of the oil pump <NUM>, and the other end of the oil discharge tube <NUM> extends to the saw chain. Driven by the oil pump <NUM>, the lubricating oil within the oil can <NUM> can be transported to the saw chain through the oil suction tube <NUM>, the oil pump <NUM>, and the oil discharge tube <NUM> to lubricate the saw chain.

In some examples, an oil outlet end of the oil discharge tube <NUM> is connected to an oil outlet nozzle, the oil outlet nozzle extends into a sealing ring, the sealing ring is fixedly disposed on the housing <NUM>, the lubricating oil in the oil discharge tube <NUM> flows through the oil outlet nozzle into an oil collecting chamber enclosed between the sealing ring and the housing <NUM>, and the saw chain in motion passes through the oil collecting chamber and adheres to the lubricating oil so that the saw chain is lubricated. In some more specific examples, the oil discharge tube <NUM>, the oil outlet nozzle, and the sealing ring are integrated into a whole to save a cost and facilitate assembly.

Still referring to <FIG>, the chainsaw further includes a lower hand guard <NUM> connected below the grip <NUM>, two ends of the lower hand guard <NUM> are connected to front and rear ends of the grip <NUM> separately so as to form an annular space, and the user places fingers in the annular space when holding the grip <NUM> of the chainsaw so that the fingers can be protected, preventing the hand of the user from being injured by a broken saw chain. Additionally, the chainsaw is provided with the lower hand guard <NUM> to facilitate storage of the chainsaw. For example, the lower hand guard <NUM> may be hung on a branch or a hook so that it is convenient for the user to free the hand to do other work.

In some examples, the thickness of the lower hand guard <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>, for example, the thickness of the lower hand guard <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

To facilitate maintenance and replacement of the lower hand guard <NUM>, in some examples, as shown in <FIG>, the lower hand guard <NUM> is detachably connected to the grip <NUM>. Specifically, a limiting hole <NUM> is disposed at each of two ends of the lower hand guard <NUM>, and a limiting column <NUM> is disposed on the housing <NUM>. The limiting hole <NUM> is inserted into the limiting column <NUM> so that the lower hand guard <NUM> is detachably connected to the grip <NUM>. In addition to this method, the lower hand guard <NUM> may be detachably connected to the grip <NUM> in a snap-fit manner. Still referring to <FIG>, the chainsaw further includes a switch lock <NUM> movably disposed on the housing <NUM> by an elastic member, and the limiting column <NUM> protrudes on the switch lock <NUM>.

It is to be noted that the lower hand guard <NUM> must be disposed on the chainsaw according to the foreign safety requirements set for the chainsaw, but the lower hand guard <NUM> does not necessarily be disposed on the chainsaw in China and many domestic users are not accustomed to the existence of the lower hand guard <NUM> when using the chainsaw. Therefore, the lower hand guard <NUM> is detachably connected to the grip <NUM> so that the lower hand guard <NUM> can be detached and mounted according to the habits of the user and a geographic location for use, thereby meeting use requirements of users.

In some examples, the oil can <NUM> is at least partially disposed or formed within the lower hand guard <NUM>. The oil can <NUM> is disposed within the lower hand guard <NUM> in the chainsaw so that a space inside the lower hand guard <NUM> can be fully utilized, which facilitates a decrease of the size of a main portion of the chainsaw and the miniaturization of the chainsaw and can improve user experience. It is to be noted that if the oil can <NUM> is disposed or formed within the lower hand guard <NUM>, it is better that the lower hand guard <NUM> is fixedly connected to the grip <NUM> so as to avoid oil leakage due to poor sealability caused by a detachable connection.

In some examples, the oil can <NUM> has an oil filler disposed on an upper surface of the lower hand guard <NUM>, so as to facilitate refueling into the oil can <NUM>.

In some examples, the lower hand guard <NUM> and the oil can <NUM> share the same housing, that is, at least part of a housing of the lower hand guard <NUM> forms an oil can housing of the oil can <NUM>, and an accommodation space for accommodating the lubricating oil is formed within the lower hand guard <NUM>. In this manner, the space inside the lower hand guard <NUM> can be fully utilized, and the volume of oil inside the lower hand guard <NUM> can be increased. In some other examples, the oil can <NUM> includes an independent oil can housing connected to an inner wall surface of the housing of the lower hand guard <NUM>.

In some examples, the oil pump <NUM> is disposed within the lower hand guard <NUM>. In this manner, the space inside the lower hand guard <NUM> can be further fully utilized, thereby further reducing the size of the main portion of the chainsaw.

Still referring to <FIG>, the oil pump <NUM> may be disposed within the grip <NUM> so that a space inside the grip <NUM> can be further fully utilized.

In some examples, the oil pump <NUM> is disposed at a middle position of the grip <NUM>, and the oil suction tube <NUM> extends into the lower hand guard <NUM> from front to rear. In some other examples, the oil pump <NUM> is disposed at the middle position of the grip <NUM>, and the oil suction tube <NUM> extends into the lower hand guard <NUM> from rear to front.

To improve an operation environment of the chainsaw, a lighting mechanism is disposed on the upper shield <NUM> of the output assembly <NUM>. The cutting region is illuminated by the lighting mechanism so that the user can clearly acquire a cutting progress and control a cutting direction, thereby improving cutting quality.

In some examples, the upper shield <NUM> is transparent and made of a transparent material. An outer side surface of the upper shield <NUM> may be sanded or otherwise treated to block light. An inner sidewall of the upper shield <NUM> is inclined to transmit light towards the guide plate, or a light guide column is disposed in the upper shield <NUM> to guide light to above the saw chain, thereby enhancing a light intensity at the saw chain and improving a visual effect.

In some examples, the lighting mechanism is an LED lamp directly controlled by a control mechanism of the chainsaw. Under the control of the control mechanism, the LED lamp may be configured to be lit ahead of time. In this example, the control mechanism may be a centralized or distributed controller. For example, the controller may be one separate single-chip microcomputer or may be composed of multiple distributed single-chip microcomputers. The single-chip microcomputer can run control programs to control the LED lamp to implement its function. It is to be noted that the control mechanism and the preceding circuit board <NUM> may be integrated or may be two independent mechanisms. Of course, in addition to the LED lamp, the lighting mechanism may employ a halogen lamp, a high-pressure sodium lamp, a low-pressure sodium lamp, or another lamp capable of implementing a lighting operation.

In some examples, the lighting mechanism is connected to the battery pack <NUM> through a wire, and the battery pack <NUM> supplies electrical energy to the lighting mechanism. In some other examples, the chainsaw may also be provided with a solar cell panel on an outer wall surface of the upper shield <NUM>, the lighting mechanism is electrically connected to the solar cell panel, and the lighting mechanism is powered by the solar cell panel. Of course, in addition to the lighting mechanism, the solar cell panel may supply power to other electric components of the chainsaw, and the solar cell panel may even completely replace the battery pack <NUM> if enough electrical energy is supplied.

In some examples, the wire is arranged on one side of the upper shield <NUM>. In some examples, an end of the upper shield <NUM> is rotatably connected to the housing <NUM> through a rotating shaft, and a torsion spring is sleeved on the rotating shaft to provide a torsion force for resetting the upper shield <NUM>. Part of the wire within the upper shield <NUM> may be integrated with the torsion spring to both conduct electricity and provide the torsion force.

Generally, the lighting mechanism is disposed on the upper shield <NUM> and rotates synchronously with the upper shield <NUM> to facilitate maintenance and replacement of the lighting mechanism. Of course, in other examples, the lighting mechanism may be fixedly disposed on the housing <NUM> so as not to rotate synchronously with the upper shield <NUM>. When the lighting mechanism is disposed on the housing <NUM>, the rotating shaft through which the upper shield <NUM> is rotatably connected to the housing <NUM> may be made of a light guide material so that the rotating shaft can both achieve a rotational connection and guide light. The upper shield <NUM> is also made of the light guide material so that the upper shield <NUM> has both a protective effect and a light guide effect. Light emitted from the lighting mechanism can enter the upper shield <NUM> through the rotating shaft so that the upper shield <NUM> emits light. Of course, the lighting mechanism may be directly disposed within the rotating shaft, and the rotating shaft is rotatably connected to the housing <NUM> and locked by a screw so that the lighting mechanism is fixed and mounted.

As shown in <FIG>, when the chainsaw is placed on a horizontal plane P, the housing <NUM> has a protruding support housing <NUM> so that the chain <NUM> will not touch the horizontal plane P when the chainsaw is placed on the horizontal plane. On a side where a battery pack <NUM> is mounted, the battery pack <NUM> may also touch the horizontal plane P. With such placement, the distance of the power tool (including the chainsaw) in the front and rear direction is defined as a total length M. That is, when the power tool (including the chainsaw) with the battery pack <NUM> mounted is placed on the horizontal plane, the distance of the power tool in the front and rear direction is the total length M.

It is to be noted that all examples of the present application are applicable to chainsaws of various sizes. The chainsaw may be the chainsaw (<NUM> or <NUM>) that can be held with a single hand, as shown in <FIG>, or the chainsaw may be a chainsaw <NUM> that may require a second handle, as shown in <FIG>.

In an example, an overall weight of the chainsaw <NUM> with no battery pack mounted is greater than or equal to <NUM> and less than or equal to <NUM>, and an overall weight of the chainsaw <NUM> with the battery pack mounted is greater than or equal to <NUM> and less than or equal to <NUM>. The total length M of the chainsaw <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>. Power of the first motor of the chainsaw <NUM> in operation is greater than or equal to <NUM> W and less than or equal to <NUM> W. Power of the liquid pump <NUM> in operation is greater than or equal to <NUM> W and less than or equal to <NUM> W.

In another example, an overall weight of the chainsaw <NUM> with no battery pack mounted is greater than or equal to <NUM> and less than or equal to <NUM>, and an overall weight of the chainsaw <NUM> with the battery pack mounted is greater than or equal to <NUM> and less than or equal to <NUM>. The total length M of the chainsaw <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>. Power of the first motor of the chainsaw <NUM> in operation is greater than or equal to <NUM> W and less than or equal to <NUM> W. Power of the liquid pump <NUM> in operation is greater than or equal to <NUM> W and less than or equal to <NUM> W. Both the chainsaw <NUM> and the chainsaw <NUM> belong to the power tool.

To conclude, according to the invention, the total length M of the chainsaw is greater than or equal to <NUM> and less than or equal to <NUM>; in an example, the total length M of the chainsaw is greater than or equal to <NUM> and less than or equal to <NUM>; in an example, the total length M of the chainsaw is greater than or equal to <NUM> and less than or equal to <NUM>; in an example, the total length M of the chainsaw is greater than or equal to <NUM> and less than or equal to <NUM>.

It should be understood that, the oil pump in this application not only mean a pump for oil, but also mean a pump for other liquid. For the same reason, the oil can not only mean a can for oil, but also mean a can for other liquid, such as water. The names of different parts can not limit the function of those parts.

Claim 1:
A chainsaw (<NUM>), comprising:
an output assembly (<NUM>) comprising a saw chain (<NUM>, <NUM>) for implementing an operation;
a first motor (<NUM>) for driving the output assembly to operate;
a housing (<NUM>) formed with a grip (<NUM>) for a user to hold;
a liquid pump assembly (<NUM>, <NUM>) comprising
a liquid pump (<NUM>) and
a second motor (<NUM>) for driving the liquid pump to operate; and
an oil can (<NUM>) for storing a liquid for lubricating the saw chain;
wherein the liquid pump assembly is at least partially disposed within the grip, and a total length M of the chainsaw is greater than or equal to <NUM> and less than or equal to <NUM>,
characterized in that
the first motor is disposed between the oil can and the liquid pump assembly.