Motor of five-in-one low-power electric pump assembly applied to vehicle active suspension

Abstract

The invention is suitable for the technical field of shock absorbers, and provides a motor of a five-in-one low-power electric pump assembly applied to a vehicle active suspension, the motor comprises a motor shell and a controller lower shell, the motor shell and the controller lower shell are integrally cast and formed, a motor stator is arranged in the motor shell, the motor shell is in interference fit with the motor stator, and the controller lower shell is arranged in the motor shell. A motor rotor is arranged in the motor stator, and the air gap between the motor rotor and the motor stator is 0.8; a deep groove ball bearing is arranged in the motor shell, the deep groove ball bearing supports the motor rotor and transmits torque, and a magnetic encoder for detecting the position of the motor rotor is further arranged in the motor shell. The motor shell and the controller lower shell are integrally cast and formed, so that the motor structure is more compact, the space occupancy rate of the motor is reduced, the BOM cost is saved, the weight is reduced, and the improvement of light weight and miniaturization is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of shock absorbers, and particularly relates to a motor of a five-in-one low-power electric pump assembly applied to a vehicle active suspension. Background Art

[0002] An automotive suspension shock absorber is an automotive component that connects the vehicle chassis and the body to reduce body vibration. It is an important component in the suspension and is related to the ride comfort and handling stability of the whole vehicle.

[0003] The traditional shock absorber has poor shock absorption performance and general ride comfort; compared with the traditional shock absorber, the semi-active suspension has continuously adjustable damping, but there is still a significant gap compared with the active suspension in terms of adjustment accuracy and response speed. As the market customers' requirements for the ride comfort and handling performance of automobiles are getting higher and higher, the market share of electronically controlled shock absorbers is gradually increasing. As a better technical solution, the active suspension is gradually becoming the market mainstream.

[0004] The motor is an important and indispensable power component of the electric pump assembly. The traditional electric pump assembly is divided into a motor, a hydraulic pump and a controller. The motor and the controller are of a split structure and are connected by bolts. While the overall volume is large, the manufacturing cost is also increased. Summary of the Invention

[0005] The invention provides a motor of a five-in-one low-power electric pump assembly applied to a vehicle active suspension, aiming to solve the problems of how to reduce the space utilization rate and manufacturing cost of the electric pump assembly, and also to solve the problems of how to improve the ride comfort and handling performance of the vehicle through the motor and bring a better ride experience to passengers.

[0006] The invention is realized as follows. A motor of a five-in-one low-power electric pump assembly applied to a vehicle active suspension includes a motor housing and a lower controller housing, and the motor housing and the lower controller housing are integrally cast. Among them, A motor stator is arranged in the motor housing, the motor housing is in interference fit with the motor stator, a motor rotor is arranged in the motor stator, and the air gap between the motor rotor and the motor stator is 0.8; A deep groove ball bearing is arranged in the motor housing. The deep groove ball bearing bears and transmits torque to the motor rotor, and a magnetic encoder for detecting the position of the motor rotor is also arranged in the motor housing.

[0007] Optionally, one side of the deep groove ball bearing is limited by a snap ring groove reserved on the motor housing, and the other side of the deep groove ball bearing axially limits the motor rotor through a snap ring groove reserved on the motor shaft.

[0008] Optionally, a pressure sensor and a temperature sensor are further disposed inside the motor housing. The pressure sensor is disposed at the oil inlet and outlet of the hydraulic pump. The lead wires of the pressure sensor and the temperature sensor are fixed and insulated by a temperature and pressure wire harness rubber plug and connected to the controller.

[0009] Optionally, a 0.8 mm air gap is left between the motor stator and the motor rotor.

[0010] Optionally, a rotor protection sleeve is fixed to the inner wall of the motor stator. The rotor protection sleeve is made of stainless steel with a thickness of 0.1 - 0.25 mm.

[0011] Optionally, a potting hole is provided on the motor housing for potting the gaps of the motor through the potting hole.

[0012] Optionally, the three-phase wires of the motor stator are radially transferred through a three-phase transfer board.

[0013] Optionally, a magnet rear cover is provided on the motor housing for sealing the rotor to prevent oil leakage.

[0014] Optionally, a sealing ring is disposed inside the motor housing. The sealing ring is used to sleeve the outside of the deep groove ball bearing to realize the sealing between the deep groove ball bearing and the motor rotor.

[0015] The beneficial effects achieved by the present invention are as follows. Since the motor of a five-in-one low-power electric pump assembly applied to a vehicle active suspension provided by the present invention includes a motor housing and a controller lower housing, the motor housing and the controller lower housing are integrally cast. A motor stator is disposed inside the motor housing, and the motor housing and the motor stator are in interference fit. A motor rotor is disposed inside the motor stator, and the air gap between the motor rotor and the motor stator is 0.8; a deep groove ball bearing is disposed inside the motor housing, and the deep groove ball bearing bears and transmits torque to the motor rotor, and a magnetic encoder for detecting the position of the motor rotor is further disposed inside the motor housing. The integral casting of the motor housing and the controller lower housing makes the motor structure more compact, thereby reducing the space occupancy rate of the motor, saving the BOM cost and reducing the weight, realizing the improvement of light weight and miniaturization; by using the high-performance deep groove ball bearing and the magnetic encoder in cooperation with the motor rotor, the performance of the motor can be effectively improved, so as to continuously provide high-pressure oil for the shock absorber to realize a wider adjustment bandwidth and a faster response speed of the suspension, and truly improve the ride comfort and handling performance of the vehicle, bringing a better driving experience to passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension provided by this application.

[0019] Figure 2 It is a schematic cross-sectional structural diagram of the motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension provided by this application.

[0020] Reference numerals: 1 - Pressure sensor, 2 - Temperature sensor, 3 - Rubber plug for temperature and pressure wire harness, 4 - Motor housing, 5 - Motor stator, 6 - Motor rotor, 7 - Rotor protection sleeve, 8 - Sealing ring, 9 - Deep groove ball bearing, 10 - Magnet rear cover, 11 - Three-phase adapter plate, 12 - Magnetic encoder, 13 - Lower controller housing. Detailed implementation manners

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following further details the present invention in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] For an effective description of the embodiments of the present invention, the following elaborates on the embodiments of this application in detail with reference to the drawings.

[0023] See Figure 1 As shown, this application discloses a motor of a five-in-one low-power electric pump assembly applied to a vehicle active suspension. The motor includes a motor housing 4 and a lower controller housing 13, and the motor housing 4 and the lower controller housing 13 are integrally cast to achieve high integration. A PCB board fixing device is provided at the connection position of the motor housing 4 and the lower controller housing 13 for fixing the PCB board to the motor housing 4. And a mirror bolt connection is adopted below the motor housing 4 to realize a 5-in-one mirror motor, which not only makes the motor structure more compact, thereby reducing the space occupancy of the motor, saving BOM costs and reducing weight, but also effectively realizes the improvement of lightweight and miniaturization and saves BOM costs.

[0024] See Figure 2As shown in the figure, in the motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension disclosed in the present application, a pressure sensor 1, a temperature sensor 2, a temperature and pressure wire harness rubber plug 3, a motor stator 5, a motor rotor 6, a rotor protection sleeve 7, a sealing ring 8, a deep groove ball bearing 9, a magnet rear cover 10, a three-phase adapter plate 11, and a magnetic encoder 12 are respectively arranged inside the motor housing 4. Among them, the motor housing 4 is in interference fit with the motor stator 5, and the assembly of the motor housing 4 and the motor stator 5 is realized by heating. The pressure sensor 1 is arranged at the oil inlet and outlet of the hydraulic pump, and the motor uses the pressure sensor 1 to detect the pressure at the oil inlet and outlet of the hydraulic pump. The temperature sensor 2 is arranged inside the motor housing 4, and the motor uses the temperature sensor 2 to detect the temperature inside the motor, so as to effectively detect the pressure and temperature of the motor through the pressure sensor 1 and the temperature sensor 2. In order to save the internal space of the motor, the lead wires of the pressure sensor 1 and the temperature sensor 2 are fixed and insulated by the temperature and pressure wire harness rubber plug 3, and their lead wires are connected to the controller, so as to send the collected pressure signal and temperature signal to the controller in real time. Of course, since the heat is mainly generated by the rotation of the motor rotor 6 and the motor stator 5, the temperature sensor 2 is arranged close to the motor stator 5 and the motor rotor 6, and the specific details are not elaborated here.

[0025] In the specific implementation process, the three-phase wires of the motor stator 5 are radially transferred through the three-phase adapter plate 11, which can effectively save space at the same time. The motor stator 5 is in interference fit with the inner wall of the motor housing 4. The motor rotor 6 is arranged inside the motor stator 5, and the air gap between the motor rotor 6 and the motor stator 5 is 0.8. In order to ensure the effective rotation between the motor rotor 6 and the motor stator 5 and avoid contact damage caused by thermal expansion of the motor stator 5 and the motor rotor 6, an air gap of 0.8 mm is left between the motor stator 5 and the motor rotor 6.

[0026] In the specific implementation process, the rotor protection sleeve 7 is fixed on the inner wall of the motor stator 5. The rotor protection sleeve 7 is made of stainless steel with a wall thickness of 0.1 - 0.25 mm. Through process processing, the stainless steel rotor protection sleeve 7 is closely attached to the inner wall of the motor stator 5, thus effectively avoiding the risk of sweeping the chamber. Moreover, in the motor disclosed in the present application, a potting hole (not shown in the drawings) is also arranged on the motor housing 4. The potting machine performs potting treatment on the gaps of the motor through this potting hole. On the one hand, it improves the insulation performance and heat conduction performance of the motor, and at the same time reduces the vibration and noise of the motor, greatly increasing the overall reliability of the motor; on the other hand, if the gap between the motor stator 5 and the rotor protection sleeve 7 is filled with glue, the pressure resistance of the rotor protection sleeve 7 can also reach 20 MPa, thus effectively improving the protection of the motor rotor 6.

[0027] In the specific implementation process, a deep groove ball bearing 9 is arranged inside the motor housing 4. The deep groove ball bearing 9 bears and transmits torque to the motor rotor 6. Specifically, a motor shaft is fixed inside the motor rotor 6. One end of the motor shaft is used to install the deep groove ball bearing 9. A snap ring groove (not shown in the drawings) is reserved on the motor shaft on one side of the deep groove ball bearing 9, and a snap ring groove (not shown in the drawings) is also reserved inside the motor housing 4 on the other side of the deep groove ball bearing 9. One side of the deep groove ball bearing 9 axially positions the motor rotor 6 through the snap ring groove reserved on the motor shaft, and the other side of the deep groove ball bearing 9 is limited by the snap ring groove reserved on the motor housing 4, so as to realize the installation of the deep groove ball bearing 9. At the same time, in order to ensure the seal between the deep groove ball bearing 9 and the motor rotor 6, a sealing ring 8 is arranged inside the motor housing 4. The sealing ring 8 is used to sleeve outside the deep groove ball bearing 9 to realize the seal between the deep groove ball bearing 9 and the motor rotor 6.

[0028] Of course, in the specific implementation process, a magnet rear cover 10 is arranged on the motor housing 4 for sealing and installing the deep groove ball bearing 9, and a magnetic encoder 12 for detecting the position of the motor rotor 6 is also arranged inside the motor housing 4. The magnetic encoder 12 is a kind of magnetic encoder. Through this magnetic encoder, the position information of the motor rotor 6 can be detected in real time, and the absolute position and relative position changes of the motor rotor 6 can be fed back. Through the accurate measurement of the rotor position, it can also assist the motor in initial positioning to ensure that the motor can accurately find the initial position when starting, laying a foundation for subsequent precise control. Specifically, it will not be elaborated in detail here.

[0029] Compared with the traditional motor, the motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension disclosed in this application integrates the motor housing 4 and the controller lower housing 13 into one, realizing the improvement of light weight and miniaturization. And the motor gap is filled with glue, improving the insulation performance and heat conduction performance of the motor. At the same time, the vibration and noise of the motor are also reduced, greatly increasing the overall reliability of the motor. A low-power motor is adopted, which greatly improves the space utilization rate and economy while ensuring the motor performance. Moreover, through the cooperation of a high-performance deep groove ball bearing and a magnetic encoder with the motor rotor, a high-performance permanent magnet motor is used to drive the internal gear pump in four quadrants, and it supports forward and reverse rotation, continuously providing high-pressure oil to the shock absorber to achieve a wider adjustment bandwidth and faster response speed of the suspension, truly improving the ride comfort and handling performance of the vehicle and bringing a better driving experience to passengers.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor of a five-in-one low-power electric pump assembly applied to a vehicle active suspension, characterized in that, It includes a motor housing (4) and a controller lower housing (13), and the motor housing (4) and the controller lower housing (13) are integrally cast. Among them, a motor stator (5) is arranged in the motor housing (4), the motor housing (4) is in interference fit with the motor stator (5), a motor rotor (6) is arranged in the motor stator (5), and the air gap between the motor rotor (6) and the motor stator (5) is 0.8; a deep groove ball bearing (9) is arranged in the motor housing (4), the deep groove ball bearing (9) supports the motor rotor (6) and transmits torque, and a magnetic encoder (12) for detecting the position of the motor rotor (6) is also arranged in the motor housing (4).

2. The motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension according to claim 1, characterized in that, One side of the deep groove ball bearing (9) is limited by a snap ring groove reserved on the motor housing (4), and the other side of the deep groove ball bearing (9) axially limits the motor rotor (6) through a snap ring groove reserved on the motor shaft.

3. The motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension according to claim 1, characterized in that A pressure sensor (1) and a temperature sensor (2) are also arranged in the motor housing (4). The pressure sensor (1) is arranged at the oil inlet and outlet of the hydraulic pump. The lead wires of the pressure sensor (1) and the temperature sensor (2) are fixed and insulated by a temperature and pressure wire harness rubber plug (3) and are connected to the controller.

4. The motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension according to claim 1, characterized in that, There is an air gap of 0.8 mm between the motor stator (5) and the motor rotor (6).

5. The motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension according to claim 4, characterized in that, A rotor protection sleeve (7) is fixed on the inner wall of the motor stator (5), and the rotor protection sleeve (7) is made of stainless steel with a thickness of 0.1 - 0.25 mm.

6. The motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension according to claim 1, characterized in that, A potting hole is provided on the motor housing (4) for potting the gaps of the motor through the potting hole.

7. The motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension according to claim 1, characterized in that, The three-phase wires of the motor stator (5) are radially transferred through a three-phase transfer board (11).

8. The motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension according to claim 1, characterized in that, A magnet rear cover (10) is provided on the motor housing (4).

9. The motor of the five-in-one low-power electric pump assembly applied to the vehicle active suspension according to claim 1, characterized in that, A sealing ring (8) is arranged in the motor housing (4), and the sealing ring (8) is used to sleeve the outside of the deep groove ball bearing (9) to realize the sealing between the deep groove ball bearing (9) and the motor rotor (6).

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