Patent ID: 12228131

DETAILED DESCRIPTION

The following, in conjunction with the accompanying drawings, further illustrates the present invention, but the scope of protection of the present invention is not limited to the aforementioned scope.

As shown inFIG.1, a highly integrated electric oil pump includes a pump housing1. The bottom of the pump housing1is provided with an oil inlet101, and its oil outlet102is provided on the side of the pump housing1. In particular, a filter14for filtering the lubricating oil is provided at the oil inlet101.

In this embodiment, the pump housing1is an aluminum housing.

The pump housing1is internally equipped with a motor and a gerotor. The gerotor is integrated with the motor rotor. In particular, a ball bearing7is arranged between the motor and the gerotor, allowing the ball bearing to be mounted at the end of the gerotor. The motor consists of a stator assembly and a motor rotor2. The gerotor consists of an inner gear6, an outer gear3and a pin5.

As shown inFIG.2, a motor rotor2is equipped with the inner side of the stator assembly. An outer gear3is mounted in internal part of the motor rotor2, the outer gear3is integrated with the motor rotor2and pressed to be together as an entire body. A shaft bushing4is mounted at the center of the motor rotor2. A pin5is provided inside the shaft bushing4, and an inner gear6is assembled outside the shaft bushing4. The inner gear6and the pin5are respectively in press fit with the shaft bushing4. In particular, the inner gear6is engaged with the outer gear3.

The outer gear of the disclosure is integrated with the motor rotor2. On the one hand, the size, weight and material and production costs of the system are significantly reduced. On the other hand, the friction in the pocket of the gerotor is effectively reduced, which has a positive effect on improvement of the system efficiency.

The ball bearing7of the disclosure is arranged between the motor rotor2and the outer gear3. The ball bearing7supports the motor rotor2to ensure the rotation of the outer gear3in the gerotor. The ball bearing7is mounted at the end of the gerotor, so that no pocket between the motor and the gerotor exists, which reduces the height of the electric oil pump and significantly reduces the weight and size of the gerotor.

Compared with the traditional electric oil pump, in which the motor rotor is pressed into the ball bearing support and then into the ball bearing and the gerotor, no ball bearing support is provided in the disclosure, which reduces the overall height of the electric oil pump on the one hand, so that the flow path of the pressurized cooling oil flowing to the stator assembly is shortened, thereby less time is required and a better cooling efficiency is obtained, and on the other hand, by which assembly stacking errors can be optimized due to less interfaces, resulting in few air-gap eccentricity issue.

The ball bearing7and the pump housing1in this embodiment are processed with the same mechanical fixture, so that both have very precise coaxiality and concentricity, so as to accurately control the air-gap eccentricity.

In the disclosure, since the outer gear is integrated in the motor rotor, the stator8of the motor and the gerotor have the same thermal expansion coefficient, which greatly reduces the influence of temperature on the end face clearance of the oil pump, accurately maintains the end face clearance of the pump, and effectively reduces or avoids the influence of temperature on the system flow efficiency.

The mechanism of the cooling oil for the stator assembly in the present invention is as follows:

The motor rotor2and the outer gear3jointly drive the inner gear6to rotate around the shaft bushing4, to pressurize the cooling oil flowing in from the oil inlet101, so that the pressurized cooling oil flows to the stator assembly through the pin5to cool the stator assembly, and the cooling oil undergoing heat exchange flows back to a low-pressure zone.

In addition, the other pressurized cooling oil is discharged directly from the oil outlet102through the high-pressure zone.

In this embodiment, the pin5is internally provided with a passage for the cooling oil to pass through.

In addition, the pin5has a hollow structure or a solid structure.

In particular, the pin5of the disclosure is designed for static fixation. The shaft bushing4is pressed directly onto the pin5. The inner gear6rotates relative to the shaft bushing4under the drive of the outer gear3, which pumps the inner gear6to rotate, lubricating each other to reduce friction, thereby reducing the loss of the gerotor, and improving the rotational stability of the gerotor.

Due to the reduction in height of the entire electronic oil pump, compared with a traditional electronic oil pump, in the present invention, the pressurized cooling oil flows to the stator assembly in a shorter time, resulting in better cooling effects.

In this embodiment, the stator assembly includes a stator8and a stator winding9mounted on the stator8. In this embodiment, the stator8is made of silicon steel sheets to reduce manufacturing costs and friction of rotary components. The wire diameter of the stator winding9is 1.8 mm. Compared to the traditional wire diameter of 1.6 mm, the performance of the gerotor is significantly improved.

In this embodiment, radial magnets10are mounted on the motor rotor2to produce the permanent magnetic force to interact with the electrical magnetic force of the stator.

To simplify the electrical controller configurations and streamline the traditional windings, a hub11is provided above the stator assembly. The pins of the stator windings9are connecting to the hub11.

A controller12is arranged above the hub11. The controller12of the disclosure is capable of achieving rapid response. It features circuit reverse connection protection, prevention of signal interference, monitoring of oil temperature to prevent prevents overheating, possession of independent communication channels, detection of motor angular position, reception of and calculated motor speed for comparison, and exact adjustment of the actual rotor speed.

In order to separate the oil circuit and the electrical controller section, a thermal insulation sealing plate13is provided between the controller12and the hub11, to improve the sealing performance. The thermal insulation sealing plate13is fixedly connected and coordinated with the hub11to avoid the internal use of screw assembly fixation structure in the oil pump.

A PTC (Positive Temperature Coefficient) temperature sensor (not labeled in figure) for detecting and providing feedback on the cooling oil temperature. The PTC temperature sensor (not labeled in the figure) is electrically connected to the controller12. The PTC temperature sensor of the disclosure can detect the oil temperature with an accuracy of 0.1° C.

The specific process for cooling the stator assembly in the disclosure is as follows.

(1) First, pump is powered on. At this point, the controller12is supplied with the power. The controller12converts the power into three-phase electricity to power the stator windings9on the hub11. The electromagnetic force drives the motor rotor2and the outer gear3to rotate. The rotation of the motor rotor2and of the outer gear3causes the cooling oil flowing from the oil inlet101to enter the low-pressure zone after passing through the filter14.

(2) The motor rotor2and the outer gear3jointly drive the inner gear6to rotate around the shaft bushing4, so as to pressurize the cooling oil flowing from the oil inlet101, so that the pressurized cooling oil flows to the stator assembly through the pin5to cool the stator assembly. The cooling oil undergoing heat exchange then flows back to the low-pressure zone. The cooling oil is pressurized by the centrifugal force created by the difference between the inner gear and the outer gear. At this point, the PTC temperature sensor feeds back the current temperature value of the oil and this temperature value is then fed back to the controller12, and the controller12communicates the current oil temperature value to an external controller system.

3) The other pressurized cooling oil is discharged directly from the oil outlet102after passing through the high-pressure zone.

REFERENCE SIGNS

1Pump Housing101Oil Inlet102Oil Outlet2Motor Rotor3outer gear4Shaft Sleeve5Pin6inner gear7Ball Bearing8Stator9Stator Winding10Radial Magnet11Hub12Controller13Thermal Insulation Sealing Plate14Filter