Integrated electric pump set applied to vehicle chassis active suspension

Abstract

The utility model provides an integrated electric pump set applied to a vehicle chassis active suspension, which comprises a shell component, a controller, a first hydraulic pump, a first motor, a second motor and a second hydraulic pump, the first hydraulic pump, the first motor, the second motor and the second hydraulic pump are axially arranged, the shell component comprises two motor shells, a controller shell and a connecting mechanism, and the two motors are respectively arranged in the two motor shells. The controller is installed in the controller shell, and the two hydraulic pumps are connected with motor shafts of the two motors respectively. The two motor shells are in axial butt joint, at least one group of bolt holes perpendicular to the axial direction are formed in the butt joint position, the connecting mechanism comprises at least one group of connecting assemblies, each connecting assembly comprises a connecting plate and a group of connecting bolts, through holes are formed in the two ends of each connecting plate, and the connecting bolts are matched with the bolt holes; the controller shell is connected to the upper sides of the two motor shells through bolts. According to the integrated electric pump set, the installation occupied space of the electric pump set assembly can be reduced, the structural design is optimized, and the disassembly difficulty can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of active suspension systems, and particularly relates to an integrated electric pump unit applied to an active suspension of a vehicle chassis. Background Art

[0002] The shock absorption performance of traditional shock absorbers is poor, and the ride comfort is average; compared with traditional shock absorbers, semi-active suspensions have continuously adjustable damping, but there is still a significant gap in terms of adjustment accuracy and response speed compared with active suspensions. With the increasing requirements of market customers for the smoothness and handling performance of automobiles, the market share of electronically controlled shock absorbers is gradually increasing. As a better technical solution, active suspensions are gradually becoming the mainstream in the market.

[0003] Full active suspensions usually use a motor pump assembly as the power supply device. The motor pump assembly usually includes two motor-pump units. Each motor-pump unit contains a motor and an oil pump. Usually, the two motor pump units are axially arranged and connected, which requires a large installation space and a high manufacturing cost. The current solution is to integrate the motor, hydraulic pump, and controller, which can reduce the occupied space to a certain extent. Usually, multiple groups of axial bolts are used to connect the housing components to achieve the integration of each component. However, the disassembly and assembly process requires repeated screwing of bolts, which is inconvenient for disassembly and assembly. Moreover, if sealant is used for sealing between the housings, the original sealant needs to be removed and reapplied after disassembly and assembly. Summary of the Utility Model

[0004] The utility model provides an integrated electric pump unit applied to an active suspension of a vehicle chassis to solve the problem of inconvenient disassembly and assembly of the motor pump unit.

[0005] To achieve the above object, an embodiment of the utility model provides an integrated electric pump unit applied to an active suspension of a vehicle chassis, which includes a housing assembly, a controller, and a first hydraulic pump, a first motor, a second motor, and a second hydraulic pump arranged axially. The housing assembly includes a first motor housing, a second motor housing, a controller housing, and a connecting mechanism. The first motor is installed in the first motor housing, the second motor is installed in the second motor housing, the controller is installed in the controller housing. The first hydraulic pump is connected to the motor shaft of the first motor, and the second hydraulic pump is connected to the motor shaft of the second motor. The first motor housing and the second motor housing are axially butted, and at least one group of bolt holes perpendicular to the axial direction are arranged at the butting position. The connecting mechanism includes at least one group of connecting components. The connecting component includes a connecting plate and a group of connecting bolts. Through holes are provided at both ends of the connecting plate, and the connecting bolts are matched with the bolt holes. The controller housing is connected to the upper sides of the two motor housings by bolts.

[0006] Optionally, there are two groups of bolt holes, which are respectively located at the front and rear sides of the butting position between the first motor housing and the second motor housing.

[0007] Optionally, a sealing groove is provided at the butt joint surface between the controller housing and the two motor housings.

[0008] Optionally, a gasket is provided between the butt joints of the first motor housing and the second motor housing.

[0009] Optionally, the housing assembly further includes a first pump housing and a second pump housing, which are respectively connected to the outer ends of the first motor housing and the second motor housing by bolts. The first pump housing and the installation cavity of the first hydraulic pump cooperate to form a sealed cavity, and the second pump housing and the installation cavity of the second hydraulic pump cooperate to form a sealed cavity.

[0010] Optionally, fixing brackets are provided at the outer ends of the first pump housing and the second pump housing.

[0011] Optionally, the first motor and the second motor include a stator, a rotor, and a motor shaft arranged from outside to inside. The motor shaft is a hollow shaft, and a plurality of waist-shaped grooves penetrating through both ends are provided on the rotor; the front ends of the motor shafts of the two motors pass through the inner end covers of the corresponding hydraulic pumps and extend into the hydraulic pumps. Two return holes communicating with the two chambers of the hydraulic pump are provided on the inner end covers of the hydraulic pumps, and one-way valves are provided in the two return holes; the oil in the hydraulic pump can flow into the end of the motor through the hollow shaft to lubricate the bearings at the end of the motor, then flow back to the front end of the motor through the waist-shaped grooves, and then flow back to the hydraulic pump through the one-way valves.

[0012] Optionally, a rotor protective sleeve is provided between the stator and the rotor, and the rotor protective sleeve is closely attached to the inner side wall of the stator.

[0013] Optionally, there is a gap between the rotor protective sleeve and the stator, and the gaps at both ends are respectively communicated with the gaps at both ends of the rotor inside the motor. Among the oil flowing into the left end of the motor through the hollow shaft, part of the oil flows back to the front end of the motor through the gap between the rotor protective sleeve and the stator, and then flows back to the hydraulic pump through the one-way valve.

[0014] Optionally, both ends of the rotor protective sleeve respectively extend to the connection between the end of the motor and the end of the motor housing and the connection between the front end of the motor and the front end of the inner end cover of the hydraulic pump. Sealing rings are provided on the inner sides of the rotor protective sleeve at the front end connection and the end connection, and a sealing sleeve ring is hoop-mounted on the outside of the front end connection.

[0015] The integrated electric pump unit applied to the active suspension of the vehicle chassis in the embodiment of the present invention integrates a controller, two motors, and two hydraulic pumps through two motor housings, one controller housing, and two pump housings, which can effectively reduce the installation space occupied by the electric pump unit assembly. The two motors can be controlled by one controller to respectively drive the two hydraulic pumps to work, supply oil to the shock absorbers on both sides of the active suspension, and realize independent adjustment of the shock absorbers on both sides of the front and rear suspensions of the vehicle.

[0016] The two motor housings of the integrated electric pump group are detachably connected by a connecting plate and bolts perpendicular to the axial direction. Compared with the connection method using multiple sets of axial bolts, the number of connecting bolts is reduced, which can reduce the difficulty of disassembly. In addition, there is no need for structural design to ensure space for wrenches, which further simplifies and optimizes the structural design and reduces the overall weight.

[0017] The controller housing of the integrated electric pump group is detachably connected to the two motor housings by bolts, and cooperates with the bolt method of the connecting plate between the two motor housings to further improve the stability of the connection between the two motor housings. In addition, the two motor housings and the controller housing can be sealed by a sealing gasket or a sealant, which has excellent waterproof and dustproof performance and is easy to operate after re-disassembly and re-assembly.

[0018] The integrated electric pump unit also forms a hydraulic oil circulation circuit by arranging a hollow motor shaft, waist grooves, a gap between the rotor protection cover and the stator, and a one-way valve. When the motor is running, the oil can flow into the end of the motor to lubricate the bearings, and the circulating oil can be used to take away the heat generated by the rotor for heat dissipation, thereby ensuring the stability of the motor operation and improving the overall performance of the electric pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is a schematic structural diagram of an integrated electric pump group applied to a vehicle chassis active suspension according to an embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of a motor according to an embodiment of the utility model.

[0022] Reference numerals:

[0023] 1. First motor housing; 2. Second motor housing; 3. Controller housing; 4. First pump housing; 5. Second pump housing; 6. Connecting plate; 7. Connecting bolts; 8. Gasket 1; 9. Fixed bracket; 10. Bracket fixing bolts; 11. Bracket mounting bolts; 12. Pump housing mounting bolts; 13. Stator; 14. Rotor; 15. Motor shaft; 16. Bearing; 17. Waist groove; 18. Rotor protection cover; 19. One-way valve; 20. Sealing ring; 21. Sealing collar; 22. Gasket 2. DETAILED DESCRIPTION

[0024] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following provides a detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the matrix embodiments disclosed below.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] As Figure 1 shown, the integrated electric pump unit applied to the active suspension of a vehicle chassis according to an embodiment of the present utility model includes two motors, two hydraulic pumps, and a controller. The first hydraulic pump, the first motor, the second motor, and the second hydraulic pump are arranged in sequence from left to right along the axial direction of the motor. The first hydraulic pump is connected to the motor shaft of the first motor, the second hydraulic pump is connected to the motor shaft of the second motor, and the controller is located above the two motors. The integrated electric pump unit further includes a housing assembly, and the housing assembly includes a first motor housing 1, a second motor housing 2, a controller housing 3, a first pump housing 4, and a second pump housing 5. The first motor is installed in the first motor housing 1, the second motor is installed in the second motor housing 2, the controller is installed in the controller housing 3, the first hydraulic pump is installed in the first pump housing 4, and the second hydraulic pump is installed in the second pump housing 5. The output shaft ends of the two motors face outward and pass through the motor housing (and / or the pump housing) to be connected to the corresponding hydraulic pumps. After the two motor housings are butted, they are located in the middle of the axial direction of the integrated electric pump unit. The two pump housings are symmetrically connected to both ends of the two motor housings, and the controller housing is located above the two motor housings.

[0027] In the integrated electric pump unit according to an embodiment of the present utility model, each housing of the housing assembly is respectively used to install the corresponding components and play a role of fixing and supporting. The first motor housing 1 is axially butted with the second motor housing 2, and at least one set of bolt holes perpendicular to the axial direction is provided at the butting position (one set of bolt holes includes two bolt holes, which are respectively located at the butting positions of the first motor housing 1 and the second motor housing 2). The connecting mechanism includes at least one set of connecting components, and the connecting components include a connecting plate 6 and a set of connecting bolts 7. Both ends of the connecting plate 6 have through holes, and the connecting bolts 7 are matched with the through holes.

[0028] Optionally, the connecting mechanism includes two sets of connecting components, which fixedly connect the two motor housings on the front and rear sides of the docking part of the two motor housings respectively (only the front-side connecting component is shown in the figure). Specifically, bolt holes are provided on the front and rear sides of the two motor housings, and the through holes at both ends of the connecting plate 6 correspond to a set of bolt holes in contact with the two motor housings. Insert the connecting bolt 7 and tighten it to achieve the fixed connection of the two motor housings.

[0029] Optionally, a first sealing gasket 8 is provided between the docking parts of the two motor housings. The first sealing gasket 8 can ensure the sealing effect between the two motor housings, and can also play a role in vibration isolation and buffering, avoiding the mutual transmission of vibrations caused by the rigid connection of the two motors through a single housing, thereby avoiding affecting the service life of the motors; in addition, it can also avoid the problem of re-coating caused by using sealant for sealing when disassembling and assembling the motors.

[0030] The controller housing 3 straddles the upper sides of the two motor housings and is bolted to the upper sides of the two motor housings. Specifically, bolt holes are provided at the edges of the controller housing 3 and the corresponding motor housings, and the control housing can be firmly connected to the two motor housings by screwing in bolts. Optionally, a sealing groove is provided at the docking surface between the controller housing 3 and the two motor housings. The sealing groove can change accordingly according to the shape of the controller housing and can include the bolt holes on the controller housing (the connection positions with the motor housings). After injecting and applying sealant into the sealing groove, the controller housing can be assembled to the two motor housings. Of course, a sealing gasket with a matching structure can also be provided in the sealing groove. After assembling the sealing gasket into the sealing groove and then bolt-connecting the controller housing to the motor housing, the sealing of the controller housing can also be achieved, and the problem of re-coating sealant can be avoided during subsequent disassembly and assembly.

[0031] Two hydraulic pumps symmetrically connect the outer ends of the two motors. Two pump housings are symmetrically bolted to the outer ends of the two motor housings. Specifically, there are multiple bolt through holes on the circumferences of the outer ends of the two motor housings, and through holes are also provided at the corresponding positions of the two pump housings. By passing the matching pump housing mounting bolts 12 through the through holes and screwing them into the bolt through holes, the pump housing can be fixedly connected to the motor housing, and it is convenient for disassembly and reinstallation. The two hydraulic pumps are gear pumps and have an installation cavity for installing internal and external gear sets; the first pump housing 4 and the installation cavity of the first hydraulic pump form a sealed cavity, and the second pump housing 5 and the installation cavity of the second hydraulic pump form a sealed cavity. The inside of the sealed cavity can have high pressure. Special-shaped sealing washers that match the shape of the connection part can also be provided between the two pump housings and the motor housings.

[0032] In an alternative embodiment, as Figure 2As shown in the figure, in the integrated electric pump unit, the motor includes a stator 13, a rotor 14, and a motor shaft 15 from outside to inside in sequence. The outer side of the stator 13 is fixedly connected to the inner side of the motor housing. The rotor 14 is axially arranged inside the stator 13. The motor shaft 15 passes through the rotor 14, and the end of the motor shaft 15 is rotatably connected to the motor housing (which can be through a bearing 16). Among them, the motor shaft 15 is a hollow shaft. The front ends of the motor shafts 15 of the two motors pass through the inner end covers of the corresponding hydraulic pumps and extend into the hydraulic pumps (here, the outer end of the motor housing is an open end and is connected to the circumferential side of the inner end cover of the hydraulic pump. The motor shaft can extend into the hydraulic pump by passing through the inner end cover of the hydraulic pump). The oil fluid at the hydraulic pump end can flow into the end of the motor through the hollow motor shaft 15 to lubricate the bearing 16, which can solve the problem that the lubricant coated during the installation of the bearing fails due to the heat generated during the long-term operation of the motor, ensure the stable operation of the motor, and improve the overall performance of the motor pump unit. Multiple axial waist slots 17 are provided in the rotor 14, and the waist slots 17 penetrate to both ends of the rotor 14; the multiple waist slots 17 are evenly distributed on the circumferential side of the motor shaft at the center of the rotor 14. The number of the waist slots 17 can be 4 - 8, not too many, and the size of the waist slots 17 cannot be too large, which can reduce the weight of the rotor and also avoid affecting the structural strength of the rotor 14.

[0033] On the inner end cover of the hydraulic pump connected to the two motor housings, there are respectively provided return holes communicating with the hydraulic pump, and one-way valves 19 with an outward conduction direction are arranged in the return holes; after the oil fluid in the hydraulic pump flows into the end of the motor through the motor shaft 15, it can then flow back to the front end of the motor through the waist slots 17 and then flow back to the hydraulic pump through the one-way valves 19. Here, the number of the return holes can be two, which are respectively connected to the two cavities of the hydraulic pump through the one-way valves 19. When the motor is running, the two cavities form a high-pressure cavity and a low-pressure cavity, which can make the oil fluid in the waist slots 17 always flow into the low-pressure cavity side through one one-way valve 19 to form a closed-loop oil return, so as to realize the oil return function of the oil fluid through the hollow shaft, the waist slots 17, and the one-way valves 19.

[0034] Specifically, the left end of the motor shaft 15 of the first motor passes through the right end cover of the first hydraulic pump and extends into the first hydraulic pump. There are two return holes respectively communicating with the two chambers of the first hydraulic pump on the right end cover of the first hydraulic pump, and one-way valves 19 are arranged in the two return holes; the oil fluid in the first hydraulic pump can flow into the right end of the first motor through the hollow shaft, then flow back to the left end of the first motor through the waist slots 17, and then flow back to the first hydraulic pump through the one-way valves 19. The right end of the motor shaft 15 of the second motor passes through the left end cover of the second hydraulic pump and extends into the second hydraulic pump. There are two return holes respectively communicating with the two chambers of the second hydraulic pump on the left end cover of the second hydraulic pump, and one-way valves 19 are arranged in the two return holes; the oil fluid in the second hydraulic pump can flow into the left end of the second motor through the hollow shaft, then flow back to the right end of the second motor through the waist slots 17, and then flow back to the second hydraulic pump through the one-way valves 19.

[0035] Optionally, a rotor protective sleeve 18 is provided between the stator 13 and the rotor 14. The rotor protective sleeve 18 is disposed closely against the inner wall of the stator 13 and can be made of stainless steel. There is a gap between the inner side of the stainless-steel rotor protective sleeve 18 and the outer side of the rotor 14. Both ends of this gap communicate with the gaps at both ends of the rotor inside the motor (the gap between the rotor end and the motor housing, and the gap between the rotor front end and the pump housing). Part of the oil flowing into the end of the motor through the hollow shaft can flow back to the front end of the motor through the gap at the motor end and the gap between the stainless-steel rotor protective sleeve 18 and the rotor 14, and then flow back to the hydraulic pump through the one-way valve 19 together with the oil flowing back to the front end of the motor through the waist groove 17. On the one hand, since most of the heat generated during the operation of the motor comes from the stator, setting this rotor protective sleeve can conduct the heat to the stainless-steel sleeve and then to the oil, so that the flowing oil can take away the heat to achieve the purpose of heat dissipation; on the other hand, it can also prevent the high-speed permanent magnets on the rotor from falling off during the operation of the motor, playing a protective role for the rotor and the stator.

[0036] Optionally, the length of the rotor protective sleeve is greater than the lengths of the stator and the rotor. The front end of the rotor protective sleeve extends to the connection between the front end of the motor and the inner end cover of the hydraulic pump, that is, the front end of the rotor protective sleeve abuts against the inner end cover of the hydraulic pump. A sealing ring 20 is provided inside the front-end connection, and the sealing ring 20 is disposed between the rotor protective sleeve and the inner end cover; a sealing sleeve ring 21 is hoop-mounted outside the front-end connection (a second sealing gasket 22 is also provided between the sealing sleeve ring 21 and the outer end of the inner end cover). The sealing ring 20, the sealing sleeve ring 21, and the second sealing gasket 22 provided inside and outside can effectively seal the front end of the motor. The end of the rotor protective sleeve extends to the connection between the end of the motor and the motor housing, that is, the end of the rotor protective sleeve abuts against the motor housing. A sealing ring 20 is provided inside the end connection for sealing the end of the motor. Here, the sealing members provided at the connections between the motor ends and the motor housing and the inner end cover of the hydraulic pump are not limited to this. In actual applications, other types of sealing members can also be set according to the actual structures of the motor housing and the inner end cover, or sealing members can be set at other positions as long as the sealing effect can be ensured.

[0037] It should be noted that Figure 2 only the structure of the second motor on the right side and its connection with the second hydraulic pump end cover in Figure 1 is shown. For the first motor on the left side and its connection with the first hydraulic pump end cover, the two motors can be symmetrically arranged relative to the center of the motor pump group.

[0038] When the integrated electric pump unit of this embodiment is applied to the active suspension of a vehicle chassis, a controller can be used to control two motors to drive two hydraulic pumps respectively to supply oil to the shock absorbers on both sides of the active suspension, realizing independent adjustment of the shock absorbers on both sides of the front and rear suspensions of the vehicle. The integrated electric pump unit integrates a controller, two motors, and two hydraulic pumps through two motor housings, a controller housing, and two pump housings, which can effectively reduce the installation space occupied by the electric pump unit assembly; moreover, the two motor housings are connected by a connecting plate and bolts perpendicular to the axial direction, which can ensure the fixed connection strength. Compared with the connection method using multiple groups of axial bolts, the number of connection bolts is reduced, the disassembly difficulty can be reduced, and there is no need for a structural design to ensure the wrench space, which simplifies and optimizes the structural design and also reduces the overall weight. The controller housing is connected to the two motor housings by bolts, which can cooperate with the bolt method of the connecting plate between the two motor housings to further improve the connection stability of the two motor housings.

[0039] In an actual application scenario, devices with corresponding functions in the prior art can be used for the controller, motor, and hydraulic pump in the integrated electric pump unit; and other structures can also be set in the integrated electric pump unit to realize the actual application or other functions of the integrated electric pump unit. For example, fixed mounting holes are provided on the first pump housing 4 and the second pump housing 5, and a fixed bracket 9 is installed through the fixed mounting holes and the mating bracket fixing bolts 10. The fixed bracket 9 has bolt holes, which facilitates the installation of the integrated electric pump unit into the suspension system through the mating bracket mounting bolts 11; for another example, interface ends or through holes for circuits and pipelines (sealed according to requirements) can be opened on the controller housing, motor housing, and pump housing to facilitate wiring and piping.

[0040] It should be noted that according to the needs of implementation, each component described in the embodiments of the present invention can be split into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of the present invention.

[0041] The above embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. An integrated electric pump group applied to vehicle chassis active suspension, comprising a housing assembly, a controller, and an axially arranged first hydraulic pump, a first motor, a second motor, and a second hydraulic pump, characterized in that: The housing assembly includes a first motor housing, a second motor housing, a controller housing and a connecting mechanism, the first motor is installed in the first motor housing, the second motor is installed in the second motor housing, the controller is installed in the controller housing, the first hydraulic pump is connected to the motor shaft of the first motor, and the second hydraulic pump is connected to the motor shaft of the second motor; the first motor housing and the second motor housing are axially docked, and at least one group of bolt holes perpendicular to the axial direction are provided at the docking point, the connecting mechanism includes at least one group of connecting components, the connecting components include a connecting plate and a group of connecting bolts, the connecting plate has through holes at both ends, and the connecting bolts match the bolt holes; the controller housing is connected to the upper sides of the two motor housings by bolts.

2. The integrated electric pump unit for vehicle chassis active suspension according to claim 1, characterized in that: There are two groups of bolt holes, which are respectively located at the front and rear sides of the joint between the first motor housing and the second motor housing.

3. The integrated electric pump unit for vehicle chassis active suspension according to claim 1, characterized in that: A sealing groove is arranged at the butt joint surface between the controller housing and the two motor housings.

4. The integrated electric pump unit for vehicle chassis active suspension according to claim 1, characterized in that: A sealing gasket is arranged between the joints of the first motor housing and the second motor housing.

5. The integrated electric pump unit for vehicle chassis active suspension according to claim 1, characterized in that: The housing assembly also includes a first pump housing and a second pump housing, which are respectively connected to the outer ends of the first motor housing and the second motor housing by bolts. The first pump housing cooperates with the installation cavity of the first hydraulic pump to form a sealed cavity, and the second pump housing cooperates with the installation cavity of the second hydraulic pump to form a sealed cavity.

6. The integrated electric pump unit for vehicle chassis active suspension according to claim 5, characterized in that: The outer ends of the first pump housing and the second pump housing are provided with fixing brackets.

7. An integrated electric pump unit for use in a vehicle chassis active suspension according to any one of claims 1 to 6, characterized in that: The first motor and the second motor include a stator, a rotor and a motor shaft arranged from outside to inside, the motor shaft is a hollow shaft, and a plurality of waist grooves extending through both ends are provided on the rotor; The front ends of the motor shafts of the two motors extend into the hydraulic pump through the inner end covers of the corresponding hydraulic pumps. The inner end covers of the hydraulic pumps are provided with two reflux holes respectively connected to the two chambers of the hydraulic pump, and one-way valves are arranged in the two reflux holes. The oil in the hydraulic pump can flow into the end of the motor through the hollow shaft to lubricate the bearings at the end of the motor, and then flow back to the front end of the motor through the waist groove, and then flow back to the hydraulic pump through the one-way valve.

8. The integrated electric pump unit for vehicle chassis active suspension according to claim 7, characterized in that: A rotor protection sleeve is arranged between the stator and the rotor, and the rotor protection sleeve is tightly attached to the inner side wall of the stator.

9. The integrated electric pump unit for vehicle chassis active suspension according to claim 8, characterized in that: There is a gap between the rotor protection cover and the stator, and the two ends are connected with the gaps at the two ends of the rotor inside the motor respectively, and flow into the oil at the left end of the motor through the hollow shaft. Part of the oil flows back to the front end of the motor through the gap between the rotor protection cover and the stator, and then flows back to the hydraulic pump through the one-way valve.

10. The integrated electric pump unit for vehicle chassis active suspension according to claim 9, characterized in that: The two ends of the rotor protective sleeve extend to the end connection between the motor end and the motor housing and the front connection between the motor front end and the inner end cover of the hydraulic pump respectively. A sealing ring is arranged inside the rotor protective sleeve at the front connection and the end connection, and a sealing ring is arranged on the outer hoop of the front connection.

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