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] This utility model belongs to the field of vehicle chassis technology, and in particular relates to a motor used in a five-in-one electric pump assembly for active suspension of a vehicle chassis, which is especially suitable for the high-efficiency hydraulic drive requirements of active suspension systems. Background Technology

[0002] With the continuous development of the automotive industry, market customers are increasingly demanding smoothness and handling from their vehicles. In the field of vehicle suspension technology, traditional shock absorbers, due to their poor vibration filtering performance, struggle to meet users' needs for ride comfort. To improve this situation, semi-active suspensions have emerged, offering continuously adjustable damping and representing a performance improvement over traditional shock absorbers. However, semi-active suspensions still lag significantly behind active suspensions in terms of adjustment precision and response speed.

[0003] Active suspension, as a superior technical solution, is gradually becoming the mainstream in the market. In an active suspension system, the electric pump assembly is one of the key components, and the electric motor is an important and indispensable power element within the electric pump assembly. A high-performance electric motor can drive a four-quadrant internal gear pump and supports forward and reverse rotation, thereby continuously supplying high-pressure oil to the shock absorbers. This achieves a wider adjustment bandwidth and faster response speed for the suspension, truly improving vehicle smoothness and handling, and providing passengers with a better driving experience.

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

[0005] To address the shortcomings of existing technologies, this invention proposes a motor for a five-in-one electric pump assembly used in a vehicle chassis active suspension system, in order to meet the requirements of a high-performance active suspension system.

[0006] The technical problem to be solved by this utility model is achieved through the following technical solution:

[0007] A motor for a five-in-one electric pump assembly for active suspension in a vehicle chassis includes 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 press-fitted to the rotor. In this invention, the motor housing is a high-strength aluminum alloy housing, which is thermally expanded to fit together with the stator. A protective sleeve is provided on the inner side of the stator, and the protective sleeve 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 internal oil passage that is connected to the air gap between the stator and rotor.

[0008] In this invention, the end of the motor shaft is connected to the hydraulic pump gear end via a spline or a pentagonal connection, and the motor shaft and the hydraulic pump gear end are coaxially arranged and sealed together.

[0009] Furthermore, the pentagonal connection is a mating structure of a shaft and a hole with a pentagonal cross-section. The end of the motor shaft is a pentagonal boss, i.e., the outer pentagonal, and the gear end of the hydraulic pump is a pentagonal groove, i.e., the inner pentagonal. The centerline of the motor shaft coincides with the centerline of the gear end of the hydraulic pump.

[0010] Furthermore, the hydraulic pump includes an oil suction chamber, which is connected to the gap between the motor stator and rotor through the oil passage of the motor shaft. The oil suction chamber is filled with cooling oil to form an oil cooling system, which also includes a one-way valve.

[0011] In this invention, the initial air gap between the stator and the rotor is 0.8 mm. After the protective sleeve is assembled, the air gap between the protective sleeve and the rotor is 0.5 mm to reduce the risk of rotor rubbing. The protective sleeve is made of metal or composite material and is fixed to the stator and motor housing by interference fit.

[0012] In this invention, the hydraulic pump is a four-quadrant gear pump, and the motor is a permanent magnet synchronous motor that supports forward and reverse rotation to continuously output high-pressure oil to the shock absorbers of the vehicle's active suspension.

[0013] A vehicle chassis active suspension five-in-one electric pump assembly includes the aforementioned motor structure for driving a hydraulic pump to adjust suspension damping.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] This application utilizes a heat-shrink process for the motor housing and an overall injection molding process to connect the motor housing, stator, and protective sleeve into a compact integrated structure. This effectively reduces space occupation and weight, facilitating a miniaturized layout of the motor structure and making it more suitable for vehicle suspension systems.

[0016] This application uses a hollow motor shaft, which is connected to 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, which not only provides sufficient lubrication to protect the motor, but also dissipates heat with the flow of oil, greatly improving the performance and heat dissipation of the motor.

[0017] The protective sleeve of this application also effectively seals and protects the stator and rotor air gap chambers, preventing oil leakage and affecting the normal operation of the oil cooling system;

[0018] The motor structure of this application can continuously output sufficient pressure to the shock absorbers of the vehicle's active suspension system to drive the hydraulic pump to adjust the suspension damping. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the motor outline of this utility model:

[0020] Figure 2 This is a schematic diagram of the motor structure of this utility model:

[0021] Figure 3 This is a cross-sectional view of the motor of this utility model.

[0022] In the diagram: 1. Motor housing; 2. Stator; 3. Protective sleeve; 4. Rotor; 5. Motor shaft; 6. Shaft end connection structure; 7. Oil passage; 8. Bearing; 9. Magnet stud oil hole. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. Example

[0024] A motor used in a five-in-one electric pump assembly for active suspension in vehicle chassis, such as... Figure 1 and 2 As shown, the device 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 expanded and heat-fitted together with the stator 2. A protective sleeve 3 is provided on the inner side of the stator 2. The protective sleeve 3 is press-fitted onto 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 press-fitted with the rotor 4. Its shaft end is connected to the hydraulic pump gear end through the shaft end connection structure 6. The motor shaft 5 and the hydraulic pump gear are coaxially arranged and sealed. The axial terminal of the motor is electrically connected to the controller.

[0025] In this embodiment, the motor shaft 5 is a hollow shaft with an internal oil passage 7. One end of the oil passage 7 is connected to the hydraulic pump's suction chamber via the gear end of the hydraulic pump, and the other end is connected to the air gap between the stator and rotor 4, forming an oil circulation path. A one-way valve is installed in the oil circulation path to drive the flow of cooling oil. The cooling oil flows from the suction chamber through the oil passage 7 of the motor shaft 5, passes through the magnetic stud oil hole 9 at the other end of the motor shaft, flows through the bearing 8, and enters the air gap between the stator 2 protective sleeve 3 and the rotor 4, thereby lubricating the bearing 8 and cooling the stator 2 and rotor 4.

[0026] It returns to the oil suction chamber, thus achieving oil cooling circulation. Example

[0027] An active suspension for vehicle chassis 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 Embodiment 1. The front end of the motor is connected to the hydraulic pump, and the side is longitudinally integrated with the motor controller to drive the hydraulic pump to adjust the suspension damping.

Claims

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

2. The motor for a five-in-one electric pump assembly for active suspension in a vehicle chassis according to claim 1, characterized in that... The end of the motor shaft is connected to the hydraulic pump gear end via a spline or pentagonal connection. The motor shaft and the hydraulic pump gear end are coaxially arranged and sealed together.

3. The motor for a five-in-one electric pump assembly for active suspension in a vehicle chassis according to claim 2, characterized in that... The pentagonal connection is a mating structure of a shaft and a hole with a pentagonal cross-section. The end of the motor shaft is a pentagonal boss, i.e., the outer pentagonal, and the gear end of the hydraulic pump is a pentagonal groove, i.e., the inner pentagonal. The centerline of the motor shaft coincides with the centerline of the gear end of the hydraulic pump.

4. The motor for a five-in-one electric pump assembly for active suspension in a vehicle chassis according to claim 2, characterized in that... The hydraulic pump includes an oil suction chamber, which is connected to the motor stator and rotor through the oil passage 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 check valve.

5. The motor for a five-in-one electric pump assembly for active suspension in a vehicle chassis according to claim 1, characterized in that... The initial air gap between the stator and the rotor is 0.8 mm. After the protective sleeve is assembled, the air gap between the protective sleeve and the rotor is 0.5 mm. The protective sleeve is made of metal or composite material, located inside the stator and fixed to the motor housing by interference fit.

6. The motor for a five-in-one electric pump assembly for active suspension in a vehicle chassis according to claim 3, characterized in that... The hydraulic pump is a four-quadrant gear pump, and the motor is a permanent magnet synchronous motor that supports forward and reverse rotation.

7. A five-in-one electric pump assembly for active suspension of a vehicle chassis, characterized in that... : Including the motor used in the five-in-one electric pump assembly for active suspension of vehicle chassis as described in any one of claims 1-6.

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