High-performance integrated electric pump set applied to vehicle chassis active suspension

Abstract

The utility model provides a high-performance integrated electric pump set applied to a vehicle chassis active suspension, which comprises two electric pump units, each electric pump unit comprises a pump shell, a motor shell and a controller shell which are sequentially arranged along the axial direction of a motor and are detachably connected through bolts, a hydraulic pump is arranged in the pump shell, a motor is arranged in the motor shell, and the controller shell is detachably connected with the hydraulic pump. A controller is arranged in the controller shell; the connecting mechanism comprises a plurality of connecting shafts, a plurality of groups of corresponding axial connecting holes are formed in the first controller shell and the second controller shell, and the plurality of connecting shafts respectively penetrate through one group of axial connecting holes to detachably connect the first controller shell with the second controller shell. According to the integrated electric pump set, independent adjustment of shock absorbers on the two sides of a front suspension and a rear suspension of an automobile can be achieved, the overall structure is compact, all parts are convenient to disassemble and assemble, the early-stage manufacturing and machining difficulty can be lowered, and disassembly and assembly during later-stage use and maintenance can be facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of active suspension systems, and particularly relates to a high-performance 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 controllability of automobiles, the market share of electronically controlled shock absorbers is gradually increasing. As a better technical solution, active suspensions are gradually becoming the market mainstream. The electric pump unit is an important and indispensable actuator of the active suspension. It drives a four-quadrant internal gear pump through a high-performance permanent magnet motor, supports forward and reverse rotation, and continuously provides high-pressure oil to the shock absorber to achieve a wider adjustment bandwidth and faster response speed of the suspension, truly improving the smoothness and controllability of the vehicle and bringing a better ride experience to passengers.

[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, and 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. However, the integration solution usually integrates two or more components into one housing. Although it can reduce the installation space occupied to a certain extent, in the early manufacturing stage, multiple components and their corresponding housings need to be processed together, resulting in high upfront manufacturing costs and high processing requirements; during the later use process, there are problems such as the need to disassemble and assemble multiple components simultaneously during maintenance, or the need to replace the entire assembly due to damage to individual components, resulting in inconvenient maintenance disassembly and high usage costs in the later stage. Summary of the Utility Model

[0004] In order to better solve the above problems, the utility model provides a high-performance integrated electric pump unit applied to an active suspension of a vehicle chassis, which can achieve independent adjustment of shock absorbers on both sides of the front and rear suspensions of the vehicle, and has a compact overall structure and convenient disassembly and assembly of each component.

[0005] To achieve the above object, an embodiment of the present utility model provides a high-performance integrated electric pump unit applied to the active suspension of a vehicle chassis, which includes a first electric pump unit, comprising a first pump housing, a first motor housing, and a first controller housing arranged in sequence from left to right along the axial direction of the motor and detachably connected by bolts. A first hydraulic pump is arranged in the first pump housing, a first motor is arranged in the first motor housing, and a first controller is arranged in the first controller housing; a second electric pump unit, comprising a second controller housing, a second motor housing, and a second pump housing arranged in sequence from left to right along the axial direction of the motor and detachably connected by bolts. A second hydraulic pump is arranged in the second pump housing, a second motor is arranged in the second motor housing, and a second controller is arranged in the second controller housing; a connecting mechanism, comprising a plurality of connecting shafts. A plurality of corresponding axial connecting holes are provided on the first controller housing and the second controller housing, and the plurality of connecting shafts respectively pass through a set of axial connecting holes to detachably connect the first controller housing and the second controller housing.

[0006] Optionally, the first controller housing includes a first controller shell body and a first end cover. The left end of the first controller shell body is bolted to the first motor housing, and the first end cover is bolted to the right end of the first controller shell body; the second controller housing includes a second controller shell body and a second end cover. The right end of the second controller shell body is bolted to the second motor housing, and the second end cover is bolted to the left end of the second controller shell body.

[0007] Optionally, wiring through holes are provided on the first controller shell body and the second controller shell body.

[0008] Optionally, a sealing groove is provided at the butt joint surface between the first controller shell body and the first end cover, and a sealing groove is provided at the butt joint surface between the second controller shell body and the second end cover. A sealing gasket is arranged in the sealing groove.

[0009] Optionally, a sealing gasket is arranged between the first motor housing and the first controller housing, and between the second motor housing and the second control housing.

[0010] Optionally, a sealing ring or a sealing gasket is arranged between the first pump housing and the first motor housing, and between the second pump housing and the second motor 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 formed 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 respectively communicating with the two chambers of the hydraulic pump are formed on the inner end covers of the hydraulic pumps, and one-way valves are arranged 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 bearing 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 protection sleeve is provided between the stator and the rotor, and the rotor protection sleeve is tightly attached to the inner wall of the stator.

[0013] Optionally, there is a gap between the rotor protection cover and the stator, and the two ends are connected to the gaps at both ends of the rotor inside the motor, flowing 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.

[0014] Optionally, the two ends of the rotor protective cover 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 provided on the inner side of the rotor protective cover at the front connection and the end connection, and a sealing ring is provided on the outer hoop of the front connection.

[0015] The high-performance integrated electric pump group applied to the active suspension of the vehicle chassis of the embodiment of the utility model is composed of two motor pump units connected axially, and two controllers can be used to control the two motors to drive two hydraulic pumps to work respectively, supply oil to the left and right shock absorbers of the active suspension, and realize the independent adjustment of the shock absorbers on both sides of the front and rear suspension of the vehicle; and the overall structure of the integrated electric pump group is compact, and the installation space is small, which meets the requirements of the lightweight design of the vehicle. The integrated electric pump group is detachably connected through the motor housing, controller housing, and pump housing in the two motor pump units, and the two motor pump units are detachably connected through the axial connecting shaft. The overall connection is stable and reliable, and each component of the electric pump group can be disassembled separately, which can not only reduce the difficulty of early manufacturing and processing, but also facilitate the disassembly and assembly for later use and maintenance.

[0016] 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

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the main structure of the integrated electric pump group according to an embodiment of the utility model;

[0019] Figure 2 Schematic left view structure of the integrated electric pump unit according to an embodiment of the present utility model;

[0020] Figure 3 Schematic structure of the motor of the integrated electric pump unit according to an embodiment of the present utility model.

[0021] Reference numerals:

[0022] 1, first motor housing; 2, second motor housing; 3, first end cover; 4, second end cover; 5, first pump housing; 6, second pump housing; 7, connecting shaft; 8, axial connection hole; 9, fixing bracket; 10, axial bolt; 11, axial threaded hole; 12, wire harness connection end; 13, wiring through groove; 14, oil hole; 15, bracket through hole; 16, bracket bolt; 17, fixing bolt; 18, stator; 19, rotor; 20, motor shaft; 21, bearing; 22, waist slot; 23, rotor protection sleeve; 24, check valve; 25, sealing ring; 26, sealing sleeve ring; 27, gasket. Detailed implementation manners

[0023] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following describes the detailed implementation manners of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand 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 implementation disclosed below.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the description 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.

[0025] Such as Figure 1-2As shown in the figure, the high-performance integrated electric pump unit applied to the active suspension of a vehicle chassis according to an embodiment of the present invention includes a first electric pump unit and a second electric pump unit. Among them, the first electric pump unit includes a first pump housing 5, a first motor housing 1, and a first controller housing that are arranged in sequence from left to right along the axial direction of the motor and are detachably connected by bolts. A first hydraulic pump is provided in the first pump housing 5, a first motor is provided in the first motor housing 1, and a first controller is provided in the first controller housing. The second electric pump unit includes a second controller housing, a second motor housing 2, and a second pump housing 6 that are arranged in sequence from left to right along the axial direction of the motor and are detachably connected by bolts. A second hydraulic pump is provided in the second pump housing 6, a second motor is provided in the second motor housing 2, and a second controller is provided in the second controller housing.

[0026] In this integrated electric pump unit, the two motor pump units are axially symmetrically arranged and are connected by a connecting mechanism at the middle docking position. The connecting mechanism includes a plurality of connecting shafts 7. Multiple groups of corresponding axial connecting holes 8 are provided on the first controller housing and the second controller housing. The plurality of connecting shafts 7 respectively pass through a group of axial connecting holes 8 to detachably connect the first controller housing and the second controller housing. The connecting mechanism shown in the figure includes four connecting shafts 7. Four groups of cross-ear type axial connecting holes 8 are integrally formed on the circumferences of the two controller housings. By passing the connecting shafts 7 through the axial connecting holes 8 and tightening bolts at both ends, the two controller housings can be fixedly connected, thereby realizing the fixed connection of the two motor pump units and facilitating disassembly.

[0027] In an optional implementation manner, the pump housings, motor housings, and control housings in the two motor pump units of this integrated electric pump unit are all detachably connected by multiple groups of axial bolt connection methods at the docking positions. For example, the left end of the first motor housing 1 is docked with the right end of the first pump housing 5. Four axial threaded holes 11 (left-facing) are provided on the circumference of the left end of the first motor housing 1 in the form of cross-ears, and four through holes are provided on the circumference of the first pump housing 5 in the form of cross-ears. By passing the axial bolts 10 through the through holes and screwing them into the axial threaded holes 11, the first pump housing 5 and the first motor housing 1 can be fixedly connected and it is convenient to disassemble. Here, the motor shaft of the first motor passes through the first motor housing 1 and the first pump housing 5 and is connected to the first hydraulic pump. In this integrated electric pump unit, the two motor pumps are detachably connected by connecting shafts, and the motor housings, controller housings, and pump housings are all detachably connected by bolts. The overall structure is a detachable connection method. In the early manufacturing and processing stage, each component and housing can be manufactured and processed separately, with low manufacturing costs and low processing requirements; in the later use stage, it is convenient to disassemble and assemble the entire electric pump unit as a whole, and it is also convenient to disassemble and assemble individual components. It is convenient for later maintenance disassembly and assembly, and the maintenance cost is relatively low.

[0028] Optionally, the first controller housing includes a first controller case and a first end cover 3. The left end of the first controller case is bolted to the first motor housing 1, and the first end cover 3 is bolted to the right end of the first controller case; the second controller housing includes a second controller case and a second end cover 4. The right end of the second controller case is bolted to the second motor housing 2, and the second end cover 4 is bolted to the left end of the second controller case. Further, as Figure 1 shown, the motor housing can be integrally formed with the controller case, which not only does not affect the pre-manufacturing and processing, but also can improve the processing efficiency; moreover, for this integrally formed motor controller case, the controller can be disassembled by removing the controller housing, or the motor and the controller can be disassembled integrally. Also, since the probability of motor damage is relatively low, generally, it is not necessary to disassemble the motor separately, which does not affect the disassembly and assembly efficiency during the later use and maintenance stage.

[0029] Optionally, a sealing groove is provided at the butt joint surface between the first controller case and the first end cover 3, and a sealing groove is provided at the butt joint surface between the second controller case and the second end cover 4. A sealing gasket is provided in the sealing groove; in addition, a sealing gasket is provided between the first motor housing 1 and the first controller housing (except for the case where the motor housing is integrally formed with the controller case), and between the second motor housing 2 and the second controller housing; a sealing ring or a sealing gasket is provided between the first pump housing 5 and the first motor housing 1, and between the second pump housing 6 and the second motor housing 2. By providing a sealing gasket between the respective housings for sealing, on the one hand, the overall sealing effect of the two motor pump units can be ensured; on the other hand, compared with the sealing method using sealant, it is convenient to reinstall after disassembly during the later maintenance stage, avoiding cleaning the original sealant and reapplying the sealant.

[0030] Two hydraulic pumps are symmetrically connected to the outer ends of the two motors, and the two pump housings are symmetrically bolted to the outer ends of the two motor housings through axial bolts. The two hydraulic pumps are gear pumps and have an installation cavity for installing an internal and external gear set; the first pump housing 5 cooperates with the installation cavity of the first hydraulic pump to form a sealed cavity, and the second pump housing 6 cooperates with the installation cavity of the second hydraulic pump to form a sealed cavity, and the inside of the sealed cavity can have high pressure.

[0031] In an alternative embodiment, as Figure 3As shown in the figure, in this integrated electric pump unit, the motor includes a stator 18, a rotor 19, and a motor shaft 20 from outside to inside in sequence. The outer side of the stator 18 is fixedly connected to the inner side of the motor housing. The rotor 19 is axially arranged inside the stator 18. The motor shaft 20 passes through the rotor 19, and the end of the motor shaft 20 is rotatably connected to the motor housing (which can be through a bearing 21). Among them, the motor shaft 20 is a hollow shaft. The front ends of the motor shafts 20 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 peripheral side of the inner end cover of the hydraulic pump. The motor shaft can extend into the hydraulic pump after 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 20 to lubricate the bearing 21, 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 22 are provided in the rotor 19, and the waist slots 22 penetrate to both ends of the rotor 19; the multiple waist slots 22 are evenly distributed on the periphery of the motor shaft at the center of the rotor 19. The number of the waist slots 22 can be 4 - 8, not too many, and the size of the waist slots 22 cannot be too large, which can reduce the weight of the rotor and also avoid affecting the structural strength of the rotor 19.

[0032] On the inner end cover of the hydraulic pump connected to the housing of the two motors, there are respectively provided return holes communicating with the hydraulic pump, and one-way valves 24 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 20, it can then flow back to the front end of the motor through the waist slots 22, and then flow back to the hydraulic pump through the one-way valves 24. 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 24. 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 22 always flow into the low-pressure cavity side through one one-way valve 24 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 22, and the one-way valves 24.

[0033] Specifically, the left end of the motor shaft of the first motor passes through the right end cover of the first hydraulic pump and extends into the first hydraulic pump. Two return holes respectively communicating with the two chambers of the first hydraulic pump are provided on the right end cover of the first hydraulic pump, and one-way valves 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 motor shaft, then flow back to the left end of the first motor through the waist slots, and then flow back to the first hydraulic pump through the one-way valves; the right end of the motor shaft of the second motor passes through the left end cover of the second hydraulic pump and extends into the second hydraulic pump. Two return holes respectively communicating with the two chambers of the second hydraulic pump are provided on the left end cover of the second hydraulic pump, and one-way valves 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 motor shaft, then flow back to the right end of the second motor through the waist slots, and then flow back to the second hydraulic pump through the one-way valves.

[0034] Optionally, a rotor protective sleeve 23 is provided between the stator 18 and the rotor 19. The rotor protective sleeve 23 is provided close to the inner wall of the stator 18 and can be made of stainless steel. There is a gap between the inner side of the stainless steel rotor protective sleeve 23 and the outer side of the rotor 19. The two ends of the gap are respectively connected with the gaps at the two 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 motor end through the hollow shaft can flow back to the motor front end through the gap at the motor end and the gap between the stainless steel rotor protective sleeve 23 and the rotor 19, and then flow back to the hydraulic pump through the one-way valve 24 together with the oil flowing back to the motor front end through the waist groove. On the one hand, since most of the heat generated during the operation of the motor comes from the stator, the provision of the rotor protective sleeve can transfer the heat to the stainless steel sleeve and then to the oil, so that the circulating 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 magnet on the rotor from falling off during the operation of the motor, and play a protective role on the rotor and the stator.

[0035] Optionally, the length of the rotor protective sleeve is greater than the length of the stator and the rotor, and 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 the inner end cover of the hydraulic pump, and a sealing ring 25 is arranged on the inner side of the front end connection, and the sealing ring 25 is arranged between the rotor protective sleeve and the inner end cover; the outer hoop of the front end connection is provided with a sealing collar 26 (a sealing gasket 27 is also arranged between the sealing collar 26 and the outer end of the inner end cover), and the front end of the motor can be effectively sealed by using the sealing ring 25, the sealing collar 26 and the sealing gasket 27 arranged inside and outside. 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 the motor housing, and a sealing ring 25 is arranged on the inner side of the end connection for sealing the end of the motor. Here, the seal provided at the connection between the end of the motor and the motor housing and the inner end cover of the hydraulic pump is not limited thereto. In practical applications, other types of seals can be provided according to the actual structure of the motor housing and the inner end cover, or seals can be provided at other positions, as long as the sealing effect can be ensured.

[0036] It should be noted that Figure 3 Only shown Figure 1 The structure of the second motor on the right side and its connection with the second hydraulic pump, and the structure of the first motor on the left side and its connection with the first hydraulic pump can be referred to Figure 3 Make corresponding settings and set the two motors symmetrically relative to the center of the motor pump group.

[0037] When the integrated electric pump group of this embodiment is applied to the active suspension of the vehicle chassis, two controllers can be used to control two motors to drive two hydraulic pumps to supply oil to the left and right shock absorbers of the active suspension, thereby realizing independent adjustment of the shock absorbers on both sides of the front and rear suspension of the vehicle.

[0038] In actual application scenarios, devices with corresponding functions in the prior art can be used for the controller, motor, hydraulic pump, etc. in the integrated electric pump unit; and other structures can also be provided in the integrated electric pump unit to achieve the actual application or other functions of the integrated electric pump unit. For example, a fixed bracket 9 with a bracket through-hole 15 is provided at the left end of the first pump housing 5 and the right end of the second pump housing 6 (installed at the outer end of the pump housing through a fixing bolt 17), which facilitates the installation of the integrated electric pump unit into the suspension system through a bracket bolt 16; for another example, a wiring connection end 12 is provided on the controller housing, a wiring through-groove 13 is provided outside the motor housing, and an oil hole for a hydraulic oil pipeline is opened at the outer end of the pump housing (sealed according to requirements).

[0039] 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.

[0040] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting 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 modifications 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 shall be subject to the appended claims.

Claims

1. A high-performance integrated electric pump unit for active suspension of vehicle chassis, characterized in that: include: The first electric pump unit comprises a first pump housing, a first motor housing and a first controller housing which are sequentially arranged from left to right along the axial direction of the motor and are detachably connected by bolts, the first pump housing is provided with a first hydraulic pump, the first motor housing is provided with a first motor, and the first controller housing is provided with a first controller; The second electric pump unit comprises a second controller housing, a second motor housing and a second pump housing which are sequentially arranged from left to right along the axial direction of the motor and detachably connected by bolts, a second hydraulic pump is arranged in the second pump housing, a second motor is arranged in the second motor housing, and a second controller is arranged in the second controller housing; The connection mechanism includes a plurality of connection shafts. The first controller housing and the second controller housing are provided with a plurality of groups of corresponding axial connection holes. The plurality of connection shafts respectively pass through a group of axial connection holes to detachably connect the first controller housing and the second controller housing.

2. A high-performance integrated electric pump unit for vehicle chassis active suspension according to claim 1, characterized in that: The first controller housing comprises a first controller casing and a first end cover, the left end of the first controller casing is bolted to the first motor casing, and the first end cover is bolted to the right end of the first controller casing; The second controller housing includes a second controller casing and a second end cover, the right end of the second controller casing is bolted to the second motor casing, and the second end cover is bolted to the left end of the second controller casing.

3. A high-performance integrated electric pump unit for vehicle chassis active suspension according to claim 2, characterized in that: Wiring through holes are provided on the first controller housing and the second controller housing.

4. A high-performance integrated electric pump unit for vehicle chassis active suspension according to claim 2, characterized in that: A sealing groove is provided at the butt joint surface between the first controller housing and the first end cover, and a sealing groove is provided at the butt joint surface between the second controller housing and the second end cover, and a sealing gasket is provided in the sealing groove.

5. The high-performance integrated electric pump unit for vehicle chassis active suspension according to claim 1, characterized in that: Sealing gaskets are arranged between the first motor housing and the first controller housing, and between the second motor housing and the second control housing.

6. The high-performance integrated electric pump unit for vehicle chassis active suspension according to claim 1, characterized in that: A sealing ring or a sealing gasket is arranged between the first pump housing and the first motor housing, and between the second pump housing and the second motor housing.

7. A high-performance integrated electric pump unit for 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. A high-performance 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. A high-performance 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. A high-performance 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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