A kind of EPS waterproof controller motor for automobile

Abstract

The present application relates to an automotive EPS waterproof controller motor, an integrated casing, and a front cover and a rear cover respectively mounted on both ends of the integrated casing, a baffle being arranged at the end of the integrated casing close to the front cover, a connecting seat being arranged on the front cover, the connecting seat being resting on the baffle, an annular convex strip being arranged on the rear cover, a sealing groove being arranged at one end of the integrated casing close to the rear cover, and the convex strip being in the sealing groove; an isolation fixing plate being arranged in the integrated casing, and the isolation fixing plate separating the integrated casing into a motor cavity and a substrate cavity; the utility model directly sets a driving circuit board, a control circuit board, a copper wire stator and a motor rotor in the integrated casing by means of the arrangement of the integrated casing, the front cover and the rear cover, and separates the two chambers by the isolation fixing plate, the overall structural layout is compact and reasonable, and the sealing cost is reduced while the sealing reliability is increased.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to an automotive EPS waterproof controller motor. Background Art

[0002] With the rapid development of the automotive industry and the deepening awareness of new energy, people are demanding higher and higher levels of energy conservation in their vehicles. Electric power steering systems, which directly provide power through a power-assisted motor, eliminate the oil pumps, conveyor belts, and oil pipes required by hydraulic steering systems. With its advantages of high safety, strong stability, energy conservation, and environmental protection, it has become a key area of ​​steering system research and development.

[0003] At present, due to the special nature of the chassis environment of automobile EPS systems, the brushless motors used in EPS may operate in high-dust, high-humidity and even water-related environments. When a traditional EPS motor passes through a high-dust, high-humidity and even water-related environment, dust or liquid will enter the brushless motor, which may cause a short circuit in the controller and thus cause the automobile EPS system to fail.

[0004] The main drawbacks are:

[0005] 1. The traditional EPS power-assist motor controller and motor are separate structures, which are large in size and complex in structure.

[0006] 2. The motor and controller are sealed separately, which results in a complex structure and high cost.

[0007] 3. The controller has poor heat dissipation performance, which causes the circuit board temperature to be high, affecting the normal operation of components.

[0008] Therefore, an automotive EPS waterproof controller motor is proposed. Utility Model Content

[0009] Based on this, it is necessary to propose an automotive EPS waterproof controller motor to address the shortcomings of the heat dissipation performance of the waterproof box of the traditional EPS motor.

[0010] The present application provides an automotive EPS waterproof controller motor, comprising an integrated housing, and a front cover and a rear cover respectively sleeved on both ends of the integrated housing. The integrated housing is provided with a stopper at an end near the front cover, a connecting seat is provided on the front cover, and the connecting seat abuts against the stopper. The rear cover is provided with an annular ridge. A sealing groove is provided at one end of the integrated housing near the rear cover, and the ridge is located in the sealing groove.

[0011] An isolation fixing plate is provided in the integrated housing, which separates the integrated housing into a motor cavity and a substrate cavity; a copper wire stator and a motor rotor are provided in the motor cavity, and bearings are provided at both ends of the motor cavity, and the main shaft of the motor rotor is connected to the bearings:

[0012] A control circuit board is provided in the substrate cavity, and a power plug-in, a signal plug-in and a sensor plug-in are provided on the control circuit board.

[0013] A heat-conducting adhesive strip is also provided on the control circuit board, and the end of the heat-conducting adhesive strip is connected to the inner wall of the rear end cover.

[0014] Preferably, the rear end cover is further provided with a breathable valve, which includes a breathable valve body, a waterproof breathable membrane and a waterproof sealing ring, and the breathable valve body is snap-connected and fixed to the rear end cover.

[0015] Preferably, the baffle is an annular ring, and a front sealing groove is provided on a side of the connecting seat close to the inner wall of the integrated housing, and a front sealing strip is provided in the front sealing groove.

[0016] Preferably, the rear end cover is provided with a power connection tube, a signal connection tube and a sensor connection tube.

[0017] The power plug-in is clamped in the power connection tube, the signal plug-in is clamped in the signal connection tube, and the sensor plug-in is clamped in the sensor connection tube.

[0018] Preferably, the power plug-in, signal plug-in and sensor plug-in are all provided with protective ring grooves on their circumferences, and the ends of the power connecting tube, signal connecting tube and sensor connecting tube are all provided with sealing convex rings, and each sealing convex ring is snap-connected to the corresponding protective ring groove.

[0019] Preferably, the cross-section of the sealing groove is rectangular, and the convex strip and the sealing groove form a U-shaped sealing structure.

[0020] Preferably, the distance between the two sides of the convex strip and the inner wall of the sealing groove is 0.5 mm.

[0021] Preferably, a heat dissipation device is provided on the rear end cover.

[0022] Preferably, the heat dissipation device includes a heat dissipation substrate and fixing screws, and the heat dissipation substrate is provided with heat dissipation fins arranged in a row.

[0023] Preferably, the heat dissipation substrate and the heat dissipation fins are integrally formed, and the heat dissipation fins are made of aluminum alloy material.

[0024] Technical advantages of this application:

[0025] 1. This utility model adopts the configuration of an integrated housing, front cover, and rear cover. The drive circuit board, control circuit board, copper wire stator, and motor rotor are directly placed in the integrated housing. The isolation plate separates the two chambers. The overall structure is compact and reasonable, which increases the sealing reliability while reducing the sealing cost.

[0026] 2. By setting up a breathable valve, only air can pass through the inside and outside, which can effectively prevent dust and negative pressure water absorption from damaging the internal part of the motor;

[0027] 3. The heat of the control board is transferred to the motor casing through the thermal conductive strips, and then dissipated through the heat dissipation device, which improves the heat dissipation efficiency and increases the reliability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0029] Figure 1 This is a three-dimensional structural diagram of the automotive EPS waterproof controller motor provided in one embodiment of the present application.

[0030] Figure 2 A schematic diagram of the internal structure of a substrate chamber provided in one embodiment of the present application.

[0031] Figure 3 A schematic diagram of the internal structure of the rear end cover provided in one embodiment of the present application.

[0032] Figure 4 A schematic cross-sectional view of the overall structure provided in one embodiment of the present application.

[0033] Figure 5 Provided for an embodiment of this application Figure 4 A magnified view of the structure of part A.

[0034] Figure 6 Provided for an embodiment of this application Figure 4 A magnified view of the structure of part B.

[0035] Figure 7 A three-dimensional structural diagram of a ventilation valve provided in one embodiment of the present application.

[0036] Figure 8 A cross-sectional view of a vent valve provided in accordance with an embodiment of the present application.

[0037] Figure markings: integrated housing 1, motor cavity 100; copper wire stator 101; motor rotor 102; bearing 103; substrate cavity 200; control circuit board 201; baffle 11; front sealing groove 210; sealing groove 12; front sealing strip 22; front end cover 2; connecting seat 21; rear end cover 3; protective ring groove 300; sealing convex ring 301; breathable valve 31; breathable valve body 311; waterproof breathable membrane 312; waterproof sealing ring 313; annular convex strip 32; isolation fixing plate 4; power plug-in 5; power connecting pipe 50; signal plug-in 6; signal connecting pipe 60; sensor plug-in 7; sensor connecting pipe 70; thermal conductive strip 8; heat dissipation device 9; heat dissipation substrate 91; fixing screws 92; heat dissipation fins 93. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in combination with the accompanying drawings by way of examples.

[0039] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0040] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or an interaction between two components. However, the phrase "direct connection" indicates that the two connected entities are not connected through an intermediate structure, but are connected to form a whole through a connecting structure. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0042] like Figure 1-2As shown in the figure, the EPS (electric power steering system) requires an inverter installed on the substrate to drive the motor. The inverter is composed of field-effect transistors (FETs). Field-effect transistors (FETs) and power components such as electrolytic capacitors and sampling resistors generate a large amount of heat during operation. If the heat cannot be dissipated in time, the performance of power components such as field-effect transistors (FETs), electrolytic capacitors and sampling resistors will degrade or even fail.

[0043] like Figures 1 to 8 As shown, the present application provides an automotive EPS waterproof controller motor.

[0044] In one embodiment of the present application

[0045] like Figure 1-Figure 4 As shown: A car EPS waterproof controller motor includes an integrated casing 1, and a front cover 2 and a rear cover 3 respectively mounted on both ends of the integrated casing 1. The front cover 2 and the integrated casing 1 are partially clamped and the ends are fixed by screws. The rear cover 3 and the integrated casing 1 are clamped by buckles.

[0046] like Figure 5 As shown: in the connection between the front end cover 2 and the integrated casing 1, a stop 11 is provided at the end of the integrated casing 1 near the front end cover 2, and the stop 11 is an annular ring. A connecting seat 21 is provided on the front end cover 2, and the connecting seat 21 rests on the stop 11. A front sealing groove 210 is provided on one side of the connecting seat 21 close to the inner wall of the integrated casing 1, and a front sealing strip 22 is provided in the front sealing groove 210.

[0047] By cooperating with the stopper 11 and the connecting seat 21 and sealing with the front sealing strip 22 , the front end cover 2 and the integrated housing 1 are tightly connected, which can effectively prevent water leakage or air leakage.

[0048] like Figure 6 As shown, in the connection between the rear end cover 3 and the integrated housing 1, a sealing groove 12 is provided at one end of the integrated housing 1 near the rear end cover 3. The rear end cover 3 is provided with an annular ridge 32. The annular ridge 32 is located within the sealing groove 12. The sealing groove 12 has a rectangular cross-section and forms a U-shaped sealing structure with the sealing groove 12. The spacing between the two sides of the annular ridge 32 and the inner wall of the sealing groove 12 is 0.5 mm. The U-shaped sealing structure has a gap of 0.5 mm on each side, which increases sealing reliability and reduces sealing costs.

[0049] like Figure 4 As shown: an isolation fixing plate 4 is provided in the integrated housing 1, and the isolation fixing plate 4 separates the integrated housing 1 into a motor cavity 100 and a substrate cavity 200; the isolation fixing plate 4 and the integrated housing 1 are connected in a detachable manner.

[0050] A copper wire stator 101 and a motor rotor 102 are provided in the motor cavity 100. Bearings 103 are provided at both ends of the motor cavity 100. The main shaft of the motor rotor 102 is connected to the bearings 103.

[0051] A control circuit board 201 is provided in the substrate cavity 200 and is fixedly connected to the isolation fixing plate 4 by screws.

[0052] like Figure 2-4 As shown: the control circuit board 201 is provided with a power plug-in 5, a signal plug-in 6 and a sensor plug-in 7, and the rear end cover 3 is provided with a power connection tube 50, a signal connection tube 60 and a sensor connection tube 70. The power connection tube 50, the power plug-in 5 is clamped in the power connection tube 50, the signal plug-in 6 is clamped in the signal connection tube 60, and the sensor plug-in 7 is clamped in the sensor connection tube 70. The signal connection tube 60 and the sensor connection tube 70 are used to connect to external wiring terminals.

[0053] like Figure 2-4 As shown: In order to further prevent dust and water from entering the substrate cavity 200, protective ring grooves 300 are provided on the circumference of the power plug-in 5, the signal plug-in 6 and the sensor plug-in 7. At the same time, sealing protrusions 301 are provided at the ends of the power connection tube 50, the signal connection tube 60 and the sensor connection tube 70. Each sealing protrusion 301 is snap-connected with the corresponding protective ring groove 300. The protective ring grooves 300 can be directly blocked on each sealing protrusion 301, thereby isolating the substrate cavity 200 from the external space and preventing dust and water from entering.

[0054] A breathable valve 31 is further provided on the rear end cover 3 . The breathable valve 31 includes a breathable valve body 311 , a waterproof breathable membrane 312 and a waterproof sealing ring 313 . The breathable valve body 311 is snap-fitted and fixed to the rear end cover 3 .

[0055] When the temperature rises, the hot gas inside can be discharged through the breathable valve 31. When the temperature drops, the gas is only allowed to pass through the breathable valve 31 to prevent the entire motor from absorbing water through other gaps when it is cooled by water and damaging the internal circuit.

[0056] When the motor temperature changes rapidly, the air valve 31 can balance the air pressure difference, thereby avoiding negative pressure water absorption caused by temperature changes when wading.

[0057] Since power components such as field effect transistors FET, de-capacitors, and sampling resistors on the control circuit board 201 will generate a large amount of heat, a thermal conductive strip 8 is provided on the control circuit board 201. The thermal conductive strip covers the heating element, and each end of the thermal conductive strip 8 is connected to the inner wall of the rear end cover 3.

[0058] like Figure 7-8 As shown: In order to further enhance the heat dissipation effect, a heat dissipation device 9 is provided on the rear end cover 3, and the heat dissipation device 9 includes a heat dissipation substrate 91 and fixing screws 92. The heat dissipation substrate 91 is provided with heat dissipation fins 93 arranged in a row. The heat dissipation substrate 91 and the heat dissipation fins 93 are integrally formed, and the heat dissipation fins 93 are made of aluminum alloy material.

[0059] The utility model directly arranges the driving circuit board, the control circuit board, the copper wire stator, and the motor rotor in the integrated casing by arranging an integrated casing, a front cover, and a rear cover, and divides the two chambers into two chambers by an isolation fixing plate. The overall structural layout is compact and reasonable, and the sealing cost is reduced while increasing the sealing reliability. By arranging a breathable valve, only air can pass through the inside and outside, which can effectively prevent dust and negative pressure water absorption from causing damage to the inside of the motor. The heat of the control board is transferred to the motor casing through the thermal conductive strip, and then dissipated through the heat dissipation device, thereby improving the heat dissipation efficiency and increasing the reliability of the entire system.

[0060] The various technical features of the above-described embodiments can be combined arbitrarily, and the execution order of the method steps is not restricted. In order to make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An automotive EPS waterproof controller motor, characterized in that: The invention comprises an integrated housing (1), and a front cover (2) and a rear cover (3) respectively sleeved on both ends of the integrated housing (1); a stopper (11) is arranged at an end of the integrated housing (1) close to the front cover (2); a connecting seat (21) is arranged on the front cover (2); the connecting seat (21) abuts against the stopper (11); an annular convex strip (32) is arranged on the rear cover (3); a sealing groove (12) is arranged at one end of the integrated housing (1) close to the rear cover (3); the annular convex strip (32) is located in the sealing groove (12); An isolation fixing plate (4) is provided in the integrated housing (1), and the isolation fixing plate (4) separates the integrated housing (1) into a motor cavity (100) and a substrate cavity (200); a copper wire stator (101) and a motor rotor (102) are provided in the motor cavity (100), bearings (103) are provided at both ends of the motor cavity (100), and a main shaft of the motor rotor (102) is connected to the bearing (103); A control circuit board (201) is arranged in the substrate cavity (200), and a power supply plug-in (5), a signal plug-in (6) and a sensor plug-in (7) are arranged on the control circuit board (201); A heat-conducting rubber strip (8) is also provided on the control circuit board (201), and the end of the heat-conducting rubber strip (8) is connected to the inner wall of the rear end cover (3).

2. The automotive EPS waterproof controller motor according to claim 1, characterized in that: The rear end cover (3) is also provided with a breathable valve (31), the breathable valve (31) comprising a breathable valve body (311), a waterproof breathable membrane (312) and a waterproof sealing ring (313), and the breathable valve body (311) is clamped and fixed on the rear end cover (3).

3. The automotive EPS waterproof controller motor according to claim 1, characterized in that: The stopper (11) is an annular ring, and a front sealing groove (210) is provided on one side of the connection seat (21) close to the inner wall of the integrated housing (1), and a front sealing strip (22) is provided in the front sealing groove (210).

4. The automotive EPS waterproof controller motor according to claim 3, characterized in that: The rear end cover (3) is provided with a power connection tube (50), a signal connection tube (60) and a sensor connection tube (70); the power plug-in (5) is clamped in the power connection tube (50), the signal plug-in (6) is clamped in the signal connection tube (60), and the sensor plug-in (7) is clamped in the sensor connection tube (70).

5. The automotive EPS waterproof controller motor according to claim 4, characterized in that: The power plug-in (5), the signal plug-in (6) and the sensor plug-in (7) are all provided with protective ring grooves (300) on their circumferences, and the ends of the power connection tube (50), the signal connection tube (60) and the sensor connection tube (70) are all provided with sealing convex rings (301), and each sealing convex ring (301) is snap-connected to the corresponding protective ring groove (300).

6. The automotive EPS waterproof controller motor according to claim 1, characterized in that: The cross section of the sealing groove (12) is rectangular, and the annular convex strip (32) and the sealing groove (12) form a U-shaped sealing structure.

7. The automotive EPS waterproof controller motor according to claim 6, characterized in that: The distance between the two sides of the annular convex strip (32) and the inner wall of the sealing groove (12) is 0.5 mm.

8. The automotive EPS waterproof controller motor according to claim 7, characterized in that: The rear end cover (3) is provided with a heat dissipation device (9).

9. The automotive EPS waterproof controller motor according to claim 8, characterized in that: The heat dissipation device (9) comprises a heat dissipation substrate (91) and fixing screws (92), and the heat dissipation substrate (91) is provided with heat dissipation fins (93) arranged in a row.

10. The automotive EPS waterproof controller motor according to claim 9, characterized in that: The heat dissipation substrate (91) and the heat dissipation fins (93) are integrally formed, and the heat dissipation fins (93) are made of an aluminum alloy material.

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