Motor applied to vehicle chassis active suspension five-in-one electric pump assembly

Abstract

A motor applied to a five-in-one electric pump assembly of an active suspension of a vehicle chassis belongs to the technical field of vehicle chassis, and comprises a motor shell, a stator, a rotor and a motor shaft, the motor shell is fixedly connected with the stator, the motor shaft is in interference press fit with the rotor, the motor shell is a high-strength aluminum alloy shell, and the stator is a high-strength aluminum alloy shell. The rotor is arranged in the shell, the rotor and the stator are thermally sleeved together in a heating expansion mode, a protective sleeve is arranged on the inner side of the stator, the protective sleeve is pressed on a corresponding mounting position of the shell to perform sealing protection on the rotor, the motor shaft is a hollow shaft, an oil path channel is arranged in the motor shaft, and the oil path channel is communicated with an air gap between the stator and the rotor. Through the integrated and compact design, the space occupation is reduced, the weight is reduced, the manufacturing cost and the assembly cost are reduced, and the performance and the heat dissipation of the motor are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle chassis, and in particular relates to a permanent magnet motor structure for an integrated five-in-one electric pump assembly, which is particularly suitable for the efficient hydraulic drive requirements of an active suspension system. Background Art

[0002] With the continuous development of the automotive industry, market demands for vehicle ride comfort and handling are increasing. In the field of vehicle suspension technology, traditional shock absorbers, due to their poor vibration filtering performance, cannot meet users' demands for driving comfort. To improve this situation, semi-active suspension has emerged. Its continuously adjustable damping offers significant performance improvements over traditional shock absorbers. However, semi-active suspension still lags significantly behind active suspension in terms of adjustment precision and response speed.

[0003] Active suspension, as a superior technical solution, is gradually becoming mainstream in the market. In active suspension systems, the electric pump assembly is a key component, and the motor is an essential and indispensable power element. This high-performance motor drives a four-quadrant internal gear pump with forward and reverse rotation, continuously supplying high-pressure oil to the shock absorber. This enables a wider adjustment bandwidth and faster response speed for the suspension, thereby truly improving vehicle ride comfort and control, and providing passengers with a better driving experience.

[0004] However, there are currently no mature examples of motor structures for five-in-one electric pump assemblies used in vehicle active suspension systems in China. Developing such motors faces challenges such as high development costs and design difficulties. Therefore, an innovative motor structure design is urgently needed to address the shortcomings of existing technologies and meet market demand for high-performance active suspension systems. Summary of the Invention

[0005] In order to address the deficiencies of the prior art, the present invention proposes a motor for a five-in-one electric pump assembly applied to a vehicle chassis active suspension system to meet the requirements of a high-performance active suspension system.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions: A motor for a five-in-one electric pump assembly used in a vehicle chassis active suspension comprises a motor housing, a stator, a rotor and a motor shaft. The motor housing is fixedly connected to the stator, and the motor shaft is interference fit with the rotor. In the present invention, the motor housing is a high-strength aluminum alloy housing, which is thermally fitted onto the stator by means of thermal expansion. A protective sleeve is provided on the inside of the stator, which is press-fitted onto a corresponding mounting position of the housing to provide sealing protection for the rotor. The motor shaft is a hollow shaft with an oil passage provided inside. The oil passage is connected to the air gap between the stator and the rotor.

[0007] In the present invention, the end of the motor shaft is connected to the hydraulic pump gear end through a spline or a five-way joint, and the motor shaft and the hydraulic pump gear end are coaxially arranged and sealed.

[0008] Furthermore, the pentagonal connection is a matching structure of a shaft and a hole with a pentagonal cross-section, the shaft end of the motor shaft is a pentagonal boss, i.e., an outer pentagon, and the gear end of the hydraulic pump is a pentagonal groove, i.e., an inner pentagon, and the center line of the motor shaft coincides with the center line of the gear end of the hydraulic pump.

[0009] Furthermore, the hydraulic pump includes an oil suction chamber, which is connected to the gap between the stator and rotor of the motor through the oil passage of the motor shaft, and is filled with cooling oil to form an oil cooling system. The oil cooling system also includes a one-way valve.

[0010] In the present invention, the initial air gap between the stator and the rotor is 0.8 mm. After the protective cover is assembled, the air gap between the protective cover and the rotor is 0.5 mm to reduce the risk of bore scraping. The protective cover is made of metal or composite material and is fixed to the stator and the motor housing by interference fit.

[0011] In the present invention, the hydraulic pump is a four-quadrant internal gear pump, and the motor is a permanent magnet synchronous motor that supports forward and reverse drive to continuously output high-pressure oil to the shock absorber of the vehicle active suspension.

[0012] A vehicle active suspension system includes the above-mentioned motor structure and is used to drive a hydraulic pump to adjust suspension damping.

[0013] Compared with the prior art, the present invention has the following advantages: The present application uses a heat shrink process and an overall glue injection process to connect the motor housing, stator, and protective cover into a compact structure. This can effectively reduce space occupation and weight, facilitate the miniaturization of the motor structure, and make it more suitable for vehicle suspension systems. This application uses a hollow motor shaft and connects it with the air gap between the motor stator and rotor and the oil suction chamber of the hydraulic pump. Under the action of a one-way valve, an oil cooling system is formed. This not only provides sufficient lubrication to protect the motor, but also achieves heat dissipation as the oil circulates, greatly improving the performance and heat dissipation of the motor. The protective sleeve of the present application also effectively achieves sealing protection for the stator and rotor air gap chamber, preventing oil from escaping and affecting the normal operation of the oil cooling system; The motor structure of the present application can continuously output sufficient pressure to the shock absorber of the vehicle active suspension system to drive the hydraulic pump to adjust the suspension damping. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the motor appearance of the present invention; Figure 2Schematic diagram of the motor structure of the present invention; Figure 3 It is a schematic cross-sectional view of the motor of the present invention.

[0015] In the figure: motor housing 1, stator 2, protective sleeve 3, rotor 4, motor shaft 5, shaft end connection structure 6, oil channel 7, bearing 8, magnet stud oil hole 9. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby. Example

[0017] A motor for a five-in-one electric pump assembly for a vehicle chassis active suspension, such as Figure 1 and 2 As shown, it includes a motor housing 1, a rotor 4, a stator 2 and a motor shaft 5. The motor housing 1 is a high-strength aluminum alloy housing, which is thermally sleeved with the stator 2 by means of heating expansion. A protective sleeve 3 is provided on the inner side of the stator 2. The protective sleeve 3 is press-fitted on the corresponding mounting position of the housing to seal and protect the rotor 4. The initial air gap between the stator 2 and the rotor 4 is 0.8 mm. After the protective sleeve 3 is assembled, the air gap between the protective sleeve 3 and the rotor 4 is 0.5 mm. The motor shaft 5 is interference fit with the rotor 4, and its shaft end is connected to the hydraulic pump gear end through the shaft end connecting structure 6. The motor shaft 5 and the hydraulic pump gear are coaxially arranged and sealed, and the axial terminal of the motor is electrically connected to the controller.

[0018] In this embodiment, the motor shaft 5 is a hollow shaft with an oil passage 7 provided inside. One end opening of the oil passage 7 is connected to the oil suction chamber of the hydraulic pump through the gear end of the hydraulic pump, and the other end opening of the oil passage 7 is connected to the air gap between the stator and rotor 4, forming an oil circulation passage. A one-way valve is provided on the oil circulation passage to drive the cooling oil therein to flow. The cooling oil passes from the oil suction chamber through the oil passage 7 of the motor shaft 5, through the magnet stud oil hole 9 at the other end of the motor shaft, flows through the bearing 8, enters the air gap between the stator 2 protective cover 3 and the rotor 4, thereby lubricating the bearing 8 and cooling the stator 2 and rotor 4, and then returns to the oil suction chamber to realize oil cooling circulation. Example

[0019] A vehicle active suspension system includes a five-in-one electric pump assembly. Specifically, the electric pump assembly includes dual motors, dual hydraulic pumps and a controller. The motor structure is as described in Example 1. The front end of the motor is connected to the hydraulic pump, and the side is longitudinally combined with the motor controller for driving the hydraulic pump to adjust the suspension damping.

Claims

1. A motor for a five-in-one electric pump assembly for a vehicle chassis active suspension, comprising a motor housing, a stator, a rotor, and a motor shaft. The motor housing is fixedly connected to the stator, and the motor shaft is interference-fitted with the rotor. The motor is characterized by: The motor housing is a high-strength aluminum alloy housing, which is thermally fused with the stator by means of thermal expansion. A protective sleeve is provided on the inner side of the stator, which is press-fitted onto the corresponding mounting position of the housing to seal and protect the rotor. The motor shaft is a hollow shaft with an oil passage inside, which is connected to the air gap between the stator and rotor.

2. The motor according to claim 1, characterized in that: The end of the motor shaft is connected to the hydraulic pump gear end through a spline or a five-way key, and the motor shaft and the hydraulic pump gear end are coaxially arranged and sealed.

3. The motor according to claim 2, characterized in that: The pentagonal connection is a matching structure of a shaft and a hole with a pentagonal cross-section. The shaft end of the motor shaft is a pentagonal boss, i.e., an outer pentagon, and the gear end of the hydraulic pump is a pentagonal groove, i.e., an inner pentagon. The center line of the motor shaft coincides with the center line of the gear end of the hydraulic pump.

4. The motor according to claim 2, characterized in that: The hydraulic pump includes an oil suction chamber, which is connected to the gap between the motor stator and rotor through the oil channel of the motor shaft. The oil suction chamber is filled with cooling oil to form an oil cooling system. The oil cooling system also includes a one-way valve.

5. The motor according to claim 1, characterized in that: The initial air gap between the stator and the rotor is 0.8 mm. After the protective cover is assembled, the air gap between the protective cover and the rotor is 0.5 mm. The protective cover is made of metal or composite material, is located inside the stator and is fixed to the motor housing through interference fit.

6. The motor according to claim 1, characterized in that: The hydraulic pump is a four-quadrant internal gear pump, and the motor is a permanent magnet synchronous motor that supports forward and reverse drive.

7. A vehicle active suspension system, characterized in that: The invention comprises a motor structure as described in any one of claims 1 to 6.

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