Drive axle and vehicle

Abstract

The application provides a drive axle and a vehicle. The drive axle comprises a motor output shaft, a first input shaft, a second input shaft and a brake. The first input shaft is arranged on the motor output shaft and is rotatable relative to the motor output shaft, and the motor output shaft is in transmission connection with the first input shaft and the second input shaft. The brake comprises a brake housing, a first friction piece, a second friction piece and a brake assembly. The brake housing is located on one side of the motor, the first friction piece is sleeved on the part of the motor output shaft located in the brake housing and is fixed in the circumferential direction of the motor output shaft, the second friction piece is sleeved on the preset part of the first input shaft, the preset part of the first input shaft extends out of the motor output shaft and is located in the brake housing, and the second friction piece is fixed in the circumferential direction of the first input shaft. The brake assembly is arranged in the brake housing and is used for pressing the second friction piece and the first friction piece, so that the second friction piece and the first friction piece are tightly abutted against each other and are fixed relative to the brake housing, so as to brake the motor output shaft and the first input shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drive axle, in particular to a drive axle and a vehicle. BACKGROUND

[0002] The drive axle is an important component of the vehicle transmission system, which can change the speed and torque from the transmission and transmit them to the drive wheels. The drive axle usually includes a motor, a differential, a brake and a reducer.

[0003] In the existing drive axle, brakes are arranged on the opposite sides of the motor to brake the left and right drive wheels. However, arranging brakes on both sides of the motor results in a large volume of the drive axle, and the structure of the drive axle is very complex due to the arrangement of brakes on both sides. SUMMARY

[0004] To solve the above technical problems, the present application provides a drive axle and a vehicle, which is arranged on one side of the motor, simplifies the structure of the drive axle, and reduces the volume of the drive axle.

[0005] The first aspect of the present application provides a drive axle for driving a vehicle, which includes a motor, a first input shaft, a second input shaft and a brake. The motor includes a motor output shaft, the first input shaft is arranged in the motor output shaft and is rotatable relative to the motor output shaft, the motor output shaft is in transmission connection with the first input shaft and the second input shaft, and the first input shaft and the second input shaft are in transmission connection with the wheels of the vehicle respectively. The brake includes a brake housing, a first friction piece, a second friction piece and a brake assembly. The brake housing is located on one side of the motor, at least part of the first input shaft and the motor output shaft is located in the brake housing, and the brake housing is in fixed connection with the vehicle body. The first friction piece is sleeved on the part of the motor output shaft located in the brake housing and is fixed in the circumferential direction of the motor output shaft. The second friction piece is sleeved on a preset part of the first input shaft, the preset part of the first input shaft extends out of the motor output shaft and is located in the brake housing, and the second friction piece is fixed in the circumferential direction of the first input shaft and is spaced apart from the first friction piece. The brake assembly is arranged in the brake housing and is used for pressing the second friction piece and the first friction piece, so that the second friction piece and the first friction piece are tightly abutted against each other and are fixed relative to the brake housing, so as to brake the motor output shaft and the first input shaft, thereby braking the wheels connected with the first input shaft and the second input shaft.

[0006] The second aspect of the present application provides a vehicle, which includes the drive axle described above.

[0007] The brake of the drive axle is located at one side of the motor, the first friction member of the brake is fixed in the circumferential direction of the motor output shaft, the second friction member of the brake is fixed in the circumferential direction of the first input shaft, and the motor output shaft and the first input shaft are braked by extruding the second friction member and the first friction member through the brake assembly, so that the wheels connected to the second input shaft and the wheels connected to the first input shaft are braked. The brake of the drive axle is located at one side of the motor, which can make the structure of the drive axle more compact and reduce the volume of the drive axle. In addition, the brake is arranged at one side of the motor, compared with arranging the brake at the opposite sides of the motor, only the brake arranged at one side needs to be cooled, which can reduce the cooling cost. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0009] Figure 1 The structural schematic diagram of the drive axle provided by an embodiment of the present application is shown.

[0010] Figure 2 For Figure 1 The cross-sectional view of the drive axle is shown.

[0011] Figure 3 For Figure 2 The enlarged view of I in FIG. 1 is shown.

[0012] Figure 4 For Figure 1 The exploded structural schematic diagram of the brake is shown.

[0013] Figure 5 For Figure 4 The partial cross-sectional structural schematic diagram of the brake housing is shown.

[0014] Figure 6 The cross-sectional view of the brake from another angle is shown.

[0015] Figure 7 For Figure 4 Another angle view of the brake housing is shown.

[0016] Figure 8 The structural block diagram of the vehicle provided by an embodiment of the present application is shown.

[0017] Explanation of reference signs:

[0018] 100 - drive axle; 10 - motor; 20 - differential; 30 - brake; 40 - reducer; 11 - motor output shaft; 21 - first input shaft; 22 - second input shaft; 31 - brake housing; 32 - first friction piece; 33 - second friction piece; 34 - brake assembly; 210 - preset part; 23 - first gear; 24 - second gear; 25 - third gear; 26 - fourth gear; 41 - driven gear; 42 - sun gear; 43 - planet gear; 50 - planet carrier; 35 - service brake assembly; 36 - parking brake assembly; 351 - service brake piston; 352 - piston driving mechanism; 361 - parking brake piston; 362 - parking elastic piece; 353 - service brake piston cavity; 311 - service oil inlet; 312 - service oil channel; 363 - parking brake piston cavity; 313 - parking oil inlet; 314 - parking oil channel; 30b - first sealing ring; 30c - second sealing ring; 37 - return elastic piece; 38 - guide piece; 39 - isolation piece; 315 - main body part; 316 - first stop plate; 317 - second stop plate; 3162 - first bolt; 3172 - second bolt; 3153 - screw hole; 3171 - accommodating groove; 391 - first isolation piece; 392 - second isolation piece; 3911 - first limiting part; 3921 - second limiting part; 3151 - third limiting part; 3912 - first mounting hole; 3922 - second mounting hole; 3152 - third mounting hole; 3161 - fourth mounting hole; 211 - rotating shaft; 212 - gear shaft; 213 - shaft sleeve; 30a - partition plate; 200 - vehicle. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] In the description of the present application, the terms "first", "second", "third", "fourth" and the like are used to distinguish different objects, not to describe a specific order, and the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] In the description of this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal connection of two components; it can be a communication connection; or it can be an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of a drive axle 100 provided in one embodiment of this application. Figure 2 for Figure 1 The cross-sectional view of the drive axle 100 shown is shown. Figure 3 for Figure 2 Enlarged view of I. The drive axle 100 is used to drive a vehicle. Figures 1 to 3 As shown, the drive axle 100 includes a motor 10, a differential 20, a brake 30, and a reducer 40. The motor 10 includes a motor output shaft 11. The differential 20 includes a first input shaft 21 and a second input shaft 22. The first input shaft 21 passes through the motor output shaft 11 and is rotatable relative to it. The motor output shaft 11 is drive-connected to the first input shaft 21 and the second input shaft 22, which are respectively drive-connected to the wheels of the vehicle. The brake 30 includes a brake housing 31, a first friction element 32, a second friction element 33, and a brake assembly 34. The brake housing 31 is located on one side of the motor 10. At least a portion of the first input shaft 21 and the motor output shaft 11 are located within the brake housing 31. The brake housing 31 is fixedly connected to the vehicle body. The first friction element 32 is sleeved on the portion of the motor output shaft 11 located within the brake housing 31 and is circumferentially fixed to the motor output shaft 11. The second friction element 33 is sleeved on a preset portion 210 of the first input shaft 21. The preset portion 210 extends out of the motor output shaft 11 and is located inside the brake housing 31. The second friction element 33 is circumferentially fixed to the first input shaft 21 and spaced apart from the first friction element 32. The braking assembly 34 is disposed inside the brake housing 31 and is used to press the second friction element 33 and the first friction element 32 together, so that the second friction element 33 and the first friction element 32 abut against each other and are fixed relative to the brake housing 31, thereby braking the motor output shaft 11 and the first input shaft 21, and thus braking the wheel connected to the first input shaft 21 and the second input shaft 22.

[0023] The brake 30 of the drive axle 100 provided in this application is located on one side of the motor 10. The brake 30 has a first friction element 32 circumferentially fixed to the motor output shaft 11, and a second friction element 33 circumferentially fixed to the first input shaft 21. The brake assembly 34 presses the second friction element 33 and the first friction element 32 to brake the motor output shaft 11 and the first input shaft 21, thereby achieving braking of the wheels connected to the second input shaft 22 and the wheels connected to the first input shaft 21. The location of the brake 30 on one side of the motor 100 allows for a more compact structure and reduced volume of the drive axle 100. Furthermore, by placing the brake 30 on one side of the motor 10, compared to placing brakes on opposite sides of the motor 10, only one side of the brake 30 needs to be cooled, reducing cooling costs.

[0024] Among them, such as Figure 2 As shown, the differential 20 is located on the side of the motor 10 away from the brake 30. The differential 20 includes a first gear 23, a second gear 24, a third gear 25, and a fourth gear 26. The first gear 23 meshes with a gear sleeved on the motor output shaft 11. The second gear 24 is fixed to the first gear 23 and meshes with the third gear 25 and the fourth gear 26. The first input shaft 21 passes through the third gear 25 and is circumferentially fixed to it. The second input shaft 22 passes through the fourth gear 26 and is circumferentially fixed to it. When the motor output shaft 11 rotates, it drives the first gear 23 to rotate. The second gear 24 follows the first gear 23 to rotate, and the third gear 25 and the fourth gear 26 follow the second gear 24 to rotate, thereby driving the first input shaft 21 and the second input shaft 22 to rotate, respectively.

[0025] The reducer 40 includes two reducers, which are respectively located on opposite sides of the motor 10. Figure 2As shown, each of the reducers 40 comprises a driving gear, a driven gear 41 engaged with the driving gear and a sun gear 42, and a planet gear 43 engaged with the sun gear 42. The wheels comprise a planet carrier 50, the planet gear 43 is fixed with the planet carrier 50, and the planet carrier 50 is the wheel hub. The first input shaft 21 is connected with a driving gear, and the second input shaft 22 is connected with another driving gear. When the first input shaft 21 and the second input shaft 22 rotate, the corresponding driving gears, driven gears 41, sun gears 42 and planet gears 43 are driven to rotate, thereby driving the corresponding wheels to rotate.

[0026] When the motor output shaft 11 rotates, the first friction member 32 rotates with the motor output shaft 11 relative to the brake housing 31, and the second friction member 33 rotates with the first input shaft 21 relative to the brake housing 31. When the brake assembly 34 brakes the motor output shaft 11 and the first input shaft 21, the first friction member 32 and the second friction member 33 are pressed to abut against and be fixed relative to the brake housing 31, so that the motor output shaft 11 and the first input shaft 21 are slowed down or stopped from rotating, thereby braking the wheels connected with the first input shaft 21 and the second input shaft 22. Since the second input shaft 22 is drivingly connected with the motor output shaft 11 through the first gear 23, the second gear 24 and the fourth gear 26, and since the fourth gear 26 sleeved on the second input shaft 22 is engaged with the third gear 25 sleeved on the first input shaft 21, if the motor output shaft 11 and the first input shaft 21 are slowed down or stopped from rotating, the second input shaft 22 will also be slowed down or stopped from rotating, thereby braking the wheels connected with the second input shaft 22.

[0027] If only the motor output shaft 11 is braked, the first input shaft 21 and the second input shaft 22 can still rotate, which can affect the braking effect of the wheels. The brake 30 provided by the embodiment of the application can brake the motor output shaft 11 and the first input shaft 21 when braking, so that the second input shaft 22 can be prevented from continuing to rotate, thereby improving the braking effect of the wheels.

[0028] The brake housing 31 can be fixedly connected with the housing of the motor 10, and the housing of the motor 10 is fixedly connected with the vehicle body.

[0029] In some embodiments, the brake assembly 34 comprises a service brake assembly and / or a parking brake assembly.

[0030] In some embodiments, as shown in FIG. 2,Figure 2 and Figure 3 As shown, the braking assembly 34 includes a service brake assembly 35 and a parking brake assembly 36. The service brake assembly 35 includes a service brake piston 351 and a piston drive mechanism 352. The service brake piston 351 is located on the side of the second friction member 33 away from the first friction member 32 and is movable along the axial direction of the first input shaft 21. The piston drive mechanism 352 drives the service brake piston 351 to press against the second friction member 33 and the first friction member 32, so that the second friction member 33 and the first friction member 32 are pressed against each other and fixed relative to the brake housing 31, thereby causing the service brake assembly 35 to brake the motor output shaft 11 and the first input shaft 21.

[0031] The service brake piston 351 can be sleeved on the first input shaft 21 and circumferentially fixed to the brake housing 31, and the first input shaft 21 is rotatable relative to the service brake piston 351. By setting the service brake piston 351 to be sleeved on the first input shaft 21, the service brake piston 351 can more evenly compress the second friction member 33, thereby making the braking effect of the service brake assembly 35 more stable.

[0032] By positioning the service brake piston 351 on the side of the second friction member 33 away from the first friction member 32, the service brake piston 351 can squeeze the second friction member 33 and the first friction member 32 together and fix them relative to the brake housing 31, thereby synchronously braking the first input shaft 21 and the motor output shaft 11.

[0033] like Figure 2 and Figure 3 As shown, the parking brake assembly 36 includes a parking brake piston 361 and a parking elastic member 362. The parking brake piston 361 is located on the side of the second friction member 33 away from the first friction member 32 and is movable along the axial direction of the first input shaft 21. The opposite ends of the parking elastic member 362 abut against the side of the parking brake piston 361 away from the second friction member 33 and the brake housing 31, respectively. When the parking elastic member 362 is in a compressed state, the parking brake piston 361 is subjected to the force of the parking elastic member 362, which compresses the second friction member 33 and the first friction member 32, causing the second friction member 33 and the first friction member 32 to press against each other and be fixed relative to the brake housing 31, thereby causing the parking brake assembly 36 to brake the motor output shaft 11 and the first input shaft 21. The parking elastic member 362 can be a parking spring.

[0034] The parking brake piston 361 can be sleeved on the first input shaft 21 and circumferentially fixed to the brake housing 31, and the first input shaft 21 is rotatable relative to the parking brake piston 361. By setting the parking brake piston 361 to be sleeved on the first input shaft 21, the parking brake piston 361 can more evenly compress the second friction member 33, thereby making the braking effect of the parking brake assembly 36 more stable.

[0035] The parking elastic element 362 may include multiple elements, which are distributed around the first input shaft 21. One end of each parking elastic element 362 abuts against the parking brake piston 361, and the other end abuts against the brake housing 31. Arranging multiple parking elastic elements 362 around the first input shaft 21 improves the uniformity of force on the parking brake piston 361, further enabling the parking brake piston 361 to uniformly compress the second friction element 33.

[0036] By positioning the parking brake piston 361 on the side of the second friction member 33 away from the first friction member 32, the parking brake piston 361 can press the second friction member 33 and the first friction member 32 together and fix them relative to the brake housing 31, thereby synchronously braking the first input shaft 21 and the motor output shaft 11.

[0037] In other embodiments, the parking elastic element 362 may be sleeved on the first input shaft 21, and the first input shaft 21 may be rotatable relative to the parking elastic element 362.

[0038] In some embodiments, such as Figure 3 As shown, the piston drive mechanism 352 includes a service brake piston cavity 353 formed by the outer surface of the service brake piston 351 and the inner surface of the brake housing 31. The service brake piston cavity 353 is used to fill with fluid to drive the service brake piston 351 to squeeze the second friction member 33 and the first friction member 32.

[0039] The side of the service brake piston 351 away from the second friction member 33 is surrounded by the brake housing 31 to form the service brake piston cavity 353, so that when the service brake piston cavity 353 is filled with fluid, the service brake piston 351 will move in the direction close to the second friction member 33.

[0040] Please see Figure 4 and Figure 5 , Figure 4 for Figure 1 The exploded structural diagram of the brake 30 shown is shown. Figure 5 for Figure 4The diagram shows a partial cross-sectional view of the brake housing 31. Figure 4 and Figure 5 As shown, the brake housing 31 has an interconnected service oil inlet 311 and service oil passage 312. The service oil inlet 311 is connected to the service brake piston chamber 353 through the service oil passage 312. The service oil inlet 311 is used to inject liquid into the service brake piston chamber 353. The liquid can be hydraulic oil. When liquid is injected into the service oil inlet 311, the liquid flows through the service oil passage 312 into the service brake piston chamber 353. The flowing liquid compresses the service brake piston 351, driving the service brake piston 351 in a direction close to the second friction member 33 (e.g., ...). Figure 2 The brake assembly 34 moves in the direction shown (A), thereby pressing the second friction member 33 and the first friction member 32 together, so that the second friction member 33 and the first friction member 32 abut against each other and are fixed relative to the brake housing 31. Thus, the service brake assembly 34 brakes the motor output shaft 11 and the first input shaft 21.

[0041] like Figure 3 As shown, the brake 30 further includes at least two first sealing rings 30b, which are sleeved on the service brake piston 351 and respectively located on opposite sides of the service brake piston cavity 353. The inner wall of the brake housing 31 is provided with at least two first sealing grooves, and each first sealing ring 30b is embedded in a first sealing groove. The at least two first sealing rings 30b are used to seal the service brake piston cavity 353.

[0042] The brake 30 further includes at least two second sealing rings 30c, which are sleeved on the parking brake piston 361 and respectively located on opposite sides of the parking brake piston cavity 363. The inner wall of the brake housing 31 is provided with at least two second sealing grooves, and each second sealing ring 30c is embedded in a second sealing groove. The at least two second sealing rings 30c are used to seal the parking brake piston cavity 363.

[0043] Please see Figure 4 and Figure 6 , Figure 6 A cross-sectional view of the brake 30 from another angle. In some embodiments, such as Figure 4 and Figure 6As shown, the brake 30 further comprises a return elastic member 37 and a guide 38 penetrating the return elastic member 37, the guide 38 is fixedly connected with the brake housing 31, and the return elastic member 37 can elastically deform along the axial direction of the first input shaft 21. The guide 38 is used to provide a guiding action when the return elastic member 37 elastically deforms, so that the return elastic member 37 elastically deforms along the axial direction of the first input shaft 21. Thus, the service brake piston 351 moves along the axial direction of the first input shaft 21, and the movement of the service brake piston 351 is more stable.

[0044] The return elastic member 37 can be a return spring, and the guide 38 can be a guide pin, and the extension direction of the guide pin can be parallel to the extension direction of the first input shaft 21.

[0045] The return elastic member 37 is used to drive the service brake piston 351 away from the second friction member 33 when the piston driving mechanism 352 stops driving the service brake piston 351 to press the second friction member 33 and the first friction member 32, so that the second friction member 33 and the first friction member 32 are separated, and the second friction member 33 and the first friction member 32 can rotate relative to the brake housing 31, so that the service brake assembly 35 stops braking the motor output shaft 11 and the first input shaft 21, that is, the service brake is released.

[0046] For example, when the service brake piston cavity 353 releases liquid, that is, the oil is released, the return elastic member 37 will push the service brake piston 351 to move in a direction away from the second friction member 33, such as the B direction shown in the figure, so that the second friction member 33 and the first friction member 32 are separated and can rotate relative to the brake housing 31. Figure 2

[0047] ​In some embodiments, as shown in FIG. 6, the parking brake piston 361 is arranged in the brake housing 31. The parking brake piston 361 is arranged in the brake housing 31 in such a way that the outer surface of the parking brake piston 361 and the inner surface of the brake housing 31 form a parking brake piston cavity 363. The parking brake piston cavity 363 is used to fill liquid to drive the parking brake piston 361 away from the second friction piece 33 and compress the parking elastic piece 362, so that the second friction piece 33 and the first friction piece 32 are separated and rotatable relative to the brake housing 31, so that the parking brake assembly 36 stops braking the motor output shaft 11 and the first input shaft 21, i.e. releases the parking brake.

[0048] In some embodiments, as shown in FIG. 6, the parking brake piston 361 is arranged in the brake housing 31. The parking brake piston 361 is arranged in the brake housing 31 in such a way that the outer surface of the parking brake piston 361 and the inner surface of the brake housing 31 form a parking brake piston cavity 363. The parking brake piston cavity 363 is used to fill liquid to drive the parking brake piston 361 away from the second friction piece 33 and compress the parking elastic piece 362, so that the second friction piece 33 and the first friction piece 32 are separated and rotatable relative to the brake housing 31, so that the parking brake assembly 36 stops braking the motor output shaft 11 and the first input shaft 21, i.e. releases the parking brake. Figure 3

[0049] In some embodiments, as shown in FIG. 6, the parking brake piston 361 is arranged in the brake housing 31. The parking brake piston 361 is arranged in the brake housing 31 in such a way that the outer surface of the parking brake piston 361 and the inner surface of the brake housing 31 form a parking brake piston cavity 363. The parking brake piston cavity 363 is used to fill liquid to drive the parking brake piston 361 away from the second friction piece 33 and compress the parking elastic piece 362, so that the second friction piece 33 and the first friction piece 32 are separated and rotatable relative to the brake housing 31, so that the parking brake assembly 36 stops braking the motor output shaft 11 and the first input shaft 21, i.e. releases the parking brake.

[0050] In some embodiments, as shown in FIG. 6, the parking brake piston 361 is arranged in the brake housing 31. The parking brake piston 361 is arranged in the brake housing 31 in such a way that the outer surface of the parking brake piston 361 and the inner surface of the brake housing 31 form a parking brake piston cavity 363. The parking brake piston cavity 363 is used to fill liquid to drive the parking brake piston 361 away from the second friction piece 33 and compress the parking elastic piece 362, so that the second friction piece 33 and the first friction piece 32 are separated and rotatable relative to the brake housing 31, so that the parking brake assembly 36 stops braking the motor output shaft 11 and the first input shaft 21, i.e. releases the parking brake.

[0051] In some embodiments, as shown in FIG. 6, the parking brake piston 361 is arranged in the brake housing 31. The parking brake piston 361 is arranged in the brake housing 31 in such a way that the outer surface of the parking brake piston 361 and the inner surface of the brake housing 31 form a parking brake piston cavity 363. The parking brake piston cavity 363 is used to fill liquid to drive the parking brake piston 361 away from the second friction piece 33 and compress the parking elastic piece 362, so that the second friction piece 33 and the first friction piece 32 are separated and rotatable relative to the brake housing 31, so that the parking brake assembly 36 stops braking the motor output shaft 11 and the first input shaft 21, i.e. releases the parking brake. Figure 4 Figure 5 ​​As shown, the brake housing 31 may be provided with a parking oil inlet 313 and a parking oil passage 314 that are interconnected. The parking oil inlet 313 is connected to the parking brake piston chamber 363 through the parking oil passage 314. The parking oil inlet 313 is used to inject liquid into the parking brake piston chamber 363. The liquid may be hydraulic oil. When liquid is injected into the parking oil inlet 313, the liquid flows through the parking oil passage 314 into the parking brake piston chamber 363. The injected liquid compresses the parking brake piston 361, causing the parking brake piston 361 to overcome the elastic force of the parking elastic member 362 and move away from the second friction member 33 in a direction (e.g., Figure 2 The second friction member 33 moves in the direction shown (B) and compresses the parking elastic member 362, causing the second friction member 33 to separate from the first friction member 32 and rotate relative to the brake housing 31, thereby causing the parking brake assembly 36 to stop braking the motor output shaft 11 and the first input shaft 21, i.e., releasing the parking brake.

[0052] In some embodiments, such as Figure 3 , Figure 4 and Figure 6 As shown, the brake 30 also includes an isolating member 39, which is located on the side of the service brake piston 351 near the second friction member 33 and is circumferentially fixed to the brake housing 31. Figure 6 As shown, the guide member 38 passes through the return elastic member 37 and the isolator 39. The service brake piston 351 and / or the parking brake piston 361 are used to press against the isolator 39, the second friction member 33 and the first friction member 32, so that the second friction member 33 and the first friction member 32 are pressed against each other. Since the isolator 39 is circumferentially fixed to the brake housing 31, the second friction member 33 and the first friction member 32 can be fixed relative to the brake housing 31, thereby braking the first input shaft 21 and the motor output shaft 11.

[0053] When the piston drive mechanism 352 stops driving the service brake piston 351 to press the second friction member 33 and the first friction member 32, the return elastic member 37 drives the service brake piston 351 away from the second friction member 33, so that the second friction member 33, the first friction member 32 and the isolation member 39 are separated, and the second friction member 33 and the first friction member 32 are rotatable relative to the brake housing 31.

[0054] For example, when the service brake piston chamber 353 leaks oil, the return elastic member 37 will push the service brake piston 351 in a direction away from the second friction member 33 (e.g., Figure 2The second friction piece 33, the first friction piece 32 and the isolation piece 39 are separated from each other, so that the second friction piece 33 and the first friction piece 32 are rotatable relative to the brake housing 31, thereby releasing the brake on the motor output shaft 11 and the first input shaft 21.

[0055] When the parking brake piston chamber 363 is filled with liquid, the parking brake piston 361 is forced away from the second friction piece 33, the second friction piece 33, the first friction piece 32 and the isolation piece 39 are separated from each other, so that the second friction piece 33 and the first friction piece 32 are rotatable relative to the brake housing 31.

[0056] The isolation piece 39 can be disposed on the side of the second friction piece 33 away from the first friction piece 32, and is sleeved on the first input shaft 21 and fixed in the circumferential direction with the first input shaft 21. The isolation piece 39 can also be disposed on the side of the first friction piece 32 away from the second friction piece 33, and is sleeved on the motor output shaft 11 and fixed in the circumferential direction with the motor output shaft 11. The isolation piece 39 can also be disposed between the second friction piece 33 and the first friction piece 32, and is sleeved on the first input shaft 21 and fixed in the circumferential direction with the first input shaft 21, or is sleeved on the motor output shaft 11 and fixed in the circumferential direction with the motor output shaft 11.

[0057] By disposing the isolation piece 39 fixed in the circumferential direction with the brake housing 31, the service brake piston 351 and the parking brake piston 361 can brake the motor output shaft 11 and the first input shaft 21 by pressing the second friction piece 33, the first friction piece 32 and the isolation piece 39. By disposing the guide piece 38 penetrating through the isolation piece 39, the isolation piece 39 can move in the axial direction of the guide piece 38 to abut against the first friction piece 32 and the second friction piece 33, so that the braking process is more stable.

[0058] In some embodiments, as Figure 3 , Figure 4 and Figure 6As shown, the isolator 39 comprises a first isolator 391 and a second isolator 392, the first isolator 391 is sleeved on the motor output shaft 11 and fixed circumferentially with the brake housing 31, the second isolator 392 is sleeved on the preset portion 210 of the first input shaft 21 and fixed circumferentially with the brake housing 31. When the piston driving mechanism 352 drives the service brake piston 351 to press the second friction piece 33 and the first friction piece 32, or the parking brake piston 361 is pressed by the parking brake elastic piece 362 to press the second friction piece 33 and the first friction piece 32, the second friction piece 33, the second isolator 392, the first friction piece 32 and the first isolator 391 are abutted and fixed relative to the brake housing 31, so that the service brake assembly 35 or the parking brake assembly 36 brakes the motor output shaft 11 and the first input shaft 21.

[0059] When the service brake or the parking brake, the second friction piece 33, the second isolator 392, the first friction piece 32 and the first isolator 391 are abutted, because the first isolator 391 and the second isolator 392 are fixed circumferentially with the brake housing 31, the first friction piece 32 and the second friction piece 33 are fixed relative to the brake housing 31, so as to brake the motor output shaft 11 and the first input shaft 21.

[0060] By sleeving the second friction piece 33 and the second isolator 392 on the first input shaft 21, and sleeving the first friction piece 32 and the first isolator 391 on the motor output shaft 11, when the service brake or the parking brake, the service brake piston 351 and the parking brake piston 361 move a short distance to make the second friction piece 33, the second isolator 392, the first friction piece 32 and the first isolator 391 abut. That is, the service brake piston 351 and the parking brake piston 361 move a short distance to brake. Thus, the movement stroke of the service brake piston 351 when the service brake is applied and the movement stroke of the parking brake piston 361 when the parking brake is applied can be shortened, so that the brake 30 can quickly brake.

[0061] Moreover, the second friction piece 33 and the second isolator 392 are both sleeved on the first input shaft 21, and the first friction piece 32 and the first isolator 391 are both sleeved on the motor output shaft 11, so that the second friction piece 33 and the first friction piece 32 can be uniformly stressed, thereby achieving uniform braking effect and making the braking process more stable.

[0062] As Figure 3 With Figure 4As shown, the brake housing 31 can include a main body 315, a first abutting plate 316 and a second abutting plate 317, which are oppositely arranged and fixedly connected with the main body 315. The brake 30 can include a first bolt 3162 and a second bolt 3172, the first abutting plate 316 can be fixedly connected with the main body 315 through the first bolt 3162, and the second abutting plate 317 can be fixedly connected with the main body 315 through the second bolt 3172. As shown, Figure 5 As shown, Figure 6 As shown, the main body 315 can be provided with a threaded hole 3153, and the first bolt 3162 is inserted and fixed in the threaded hole 3153.

[0063] As shown, Figure 3 As shown, the second friction piece 33, the first friction piece 32, the isolation piece 39 and the brake assembly 34 are located in the main body 315. The first abutting plate 316 is located on the side of the first friction piece 32 away from the second friction piece 33, and when the service brake assembly 35 is in service braking and / or the parking brake assembly 36 is in parking braking, the second friction piece 33, the second isolation piece 392, the first friction piece 32 and the first isolation piece 391 abut against the first abutting plate 316, thereby increasing the friction between the first friction piece 32 and the second friction piece 33 and the brake housing 31, so as to improve the braking force.

[0064] As shown, Figure 3 As shown, the second abutting plate 317 is located on the side of the parking elastic piece 362 away from the parking brake piston 361 and abuts against the parking elastic piece 362. As shown, Figure 4 As shown, the second abutting plate 317 can be provided with a plurality of accommodating grooves 3171, one end of each parking elastic piece 362 abuts against the parking brake piston 361, and the other end is accommodated in an accommodating groove 3171 and abuts against the groove wall of the accommodating groove 3171.

[0065] In some embodiments, the brake 30 does not include the isolation piece 39, and the service brake piston 351 and / or the parking brake piston 361 can press the second friction piece 33 and the first friction piece 32 to make them press the first abutting plate 316, so that the second friction piece 33 and the first friction piece 32 are fixed relative to the brake housing 31, thereby braking the first input shaft 21 and the motor output shaft 11.

[0066] In some embodiments, as shown, Figure 6As shown, the guide 38 is arranged through the first spacer 391, the second spacer 392 and the return elastic member 37, and opposite ends of the guide 38 are fixed in the brake housing 31. Specifically, one end of the guide 38 is fixed to the first abutting plate 316, and the other end is fixed to the main body 315.

[0067] When the piston driving mechanism 352 stops driving the service brake piston 351 to press the second friction member 33 and the first friction member 32, for example, the service brake piston chamber 353 releases liquid, the return elastic member 37 pushes the service brake piston 351 away from the second friction member 33, so that the second friction member 33, the first spacer 391, the first friction member 32 and the second spacer 392 are separated, and the second friction member 33 and the first friction member 32 are rotatable relative to the brake housing 31, thereby releasing the service brake.

[0068] When the parking brake piston chamber 363 is filled with liquid, the parking brake piston 361 is forced to move away from the second friction member 33, the second friction member 33, the first spacer 391, the first friction member 32 and the second spacer 392 are separated, so that the second friction member 33 and the first friction member 32 are rotatable relative to the brake housing 31, thereby releasing the parking brake.

[0069] In some embodiments, as shown in FIG. 1, the return elastic member 37 is arranged through the first spacer 391, the second spacer 392 and the first friction member 32. Figure 4 As shown in FIG. 1, the return elastic member 37 is arranged through the first spacer 391, the second spacer 392 and the first friction member 32. Figure 6 As shown, the return elastic member 37 includes at least two, the first spacer 391 includes at least two, the first spacer 391 and the first friction member 32 are arranged alternately and spaced apart, and the return elastic member 37 is arranged between adjacent two first spacers 391. And / or, the second spacer 392 includes at least two, the second spacer 392 and the second friction member 33 are arranged alternately and spaced apart, and the return elastic member 37 is arranged between adjacent two second spacers 392. Specifically, the orthographic projection of the first friction member 32 on the first spacer 391 is spaced apart from the orthographic projection of the return elastic member 37 on the first spacer 391, and the orthographic projection of the second friction member 33 on the second spacer 392 is spaced apart from the orthographic projection of the return elastic member 37 on the second spacer 392, so as to avoid the guide 38 passing through the first friction member 32 and the second friction member 33.

[0070] By alternately arranging the first separators 391 and the first friction pieces 32, each first friction piece 32 can be in contact with at least one first separator 391 during braking or parking braking. By alternately arranging the second separators 392 and the second friction pieces 33, each second friction piece 33 can be in contact with at least one second separator 392 during braking or parking braking, so as to increase the braking force and improve the braking efficiency of the motor output shaft 11 and the first input shaft 21.

[0071] In some embodiments, each first friction piece 32 can be arranged between two adjacent first separators 391, and each second friction piece 33 can be arranged between two adjacent second separators 392, so that during braking or parking braking, the opposite surfaces of each first friction piece 32 are in contact with a first separator 391 respectively, and the opposite surfaces of each second friction piece 33 are in contact with a second separator 392 respectively, so as to increase the contact area, thereby increasing the friction force, further increasing the braking force and further improving the braking efficiency of the motor output shaft 11 and the first input shaft 21. For example, as shown in Figure 4 and Figure 6 The first separators 391 include three, the first friction pieces 32 include two, which are arranged between two adjacent first separators 391, the second separators 392 include two, and the second friction pieces 33 include one, which is arranged between the two second separators 392. Obviously, the number of the first separators 391, the first friction pieces 32, the second separators 392 and the second friction pieces 33 can be set according to actual needs.

[0072] In some embodiments, the gap between the first friction piece 32 and the first separator 391 is greater than or equal to 0.1 mm, so that the first friction piece 32 and the first separator 391 can rotate relative to each other, and during braking, the first friction piece 32 can quickly abut against the first separator 391. The gap between the second friction piece 33 and the second separator 392 is greater than or equal to 0.1 mm, so that the second friction piece 33 and the second separator 392 can rotate relative to each other, and during braking, the second friction piece 33 can quickly abut against the second separator 392.

[0073] By arranging the return elastic member 37 between the two adjacent first isolation members 391, the first friction member 32 between the two adjacent first isolation members 391 can be quickly separated from the two adjacent first isolation members 391 under the elastic force of the return elastic member 37 when the driving or parking brake is released, thereby improving the brake release efficiency of the motor output shaft 11. Moreover, the presence of the return elastic member 37 can ensure that the first friction member 32 is separated from the first isolation member 391, thereby improving the reliability of the brake release of the motor output shaft 11.

[0074] Similarly, by arranging the return elastic member 37 between the two adjacent second isolation members 392, the second friction member 33 between the two adjacent second isolation members 392 can be quickly separated from the two adjacent second isolation members 392 under the elastic force of the return elastic member 37 when the driving or parking brake is released, thereby improving the brake release efficiency of the first input shaft 21. Moreover, the presence of the return elastic member 37 can ensure that the second friction member 33 is separated from the second isolation member 392, thereby improving the reliability of the brake release of the first input shaft 21.

[0075] Furthermore, by arranging the return elastic member 37 between the first friction member 32 and the first isolation member 391 and between the second friction member 33 and the second isolation member 392, the gap between the first friction member 32 and the first isolation member 391 and the gap between the second friction member 33 and the second isolation member 392 can be utilized to make the structure of the brake 30 more compact.

[0076] In some other embodiments, the return elastic member 37 can be arranged between the first isolation member 391 farthest from the second friction member 33 and the first abutting plate 316, and between the second isolation member 392 farthest from the first friction member 32 and the main body 315.

[0077] In some embodiments, the isolation member 39 is provided with a first circumferential limiting portion, the brake housing 31 is provided with a second circumferential limiting portion, the first circumferential limiting portion cooperates with the second circumferential limiting portion to circumferentially fix the isolation member 39 and the brake housing 31, and the guide member 38 penetrates the return elastic member 37, the first circumferential limiting portion and the second circumferential limiting portion. The first circumferential limiting portion can be one of a groove and a protrusion, and the second circumferential limiting portion can be the other one of a groove and a protrusion.

[0078] The first circumferential limiting portion includes a first limiting portion and a second limiting portion. As shown in FIG. 2, the first limiting portion is a groove, and the second limiting portion is a protrusion.Figure 4 As shown, the first isolation member 391 has a first limiting portion 3911 on its outer periphery, and the second isolation member 392 has a second limiting portion 3921 on its outer periphery. Please refer to [link / reference]. Figure 7 ,for Figure 4 Another angle view of the brake housing 31 is shown. Figure 7 As shown, the main body 315 has a third limiting part 3151 inside. The first limiting part 3911 and the second limiting part 3921 both cooperate with the third limiting part 3151 so that the first isolation member 391 and the second isolation member 392 are both circumferentially fixed to the brake housing 31.

[0079] In some embodiments, the third limiting portion 3151 is a groove, and the first limiting portion 3911 and the second limiting portion 3921 are both protrusions. The first limiting portion 3911 and the second limiting portion 3921 are embedded in the third limiting portion 3151 and are circumferentially fixed to the brake housing 31. In other embodiments, the third limiting portion 3151 is a protrusion, and the first limiting portion 3911 and the second limiting portion 3921 are both grooves.

[0080] like Figure 4 As shown, the first limiting part 3911 may have a first mounting hole 3912, and the second limiting part 3921 may have a second mounting hole 3922. Figure 7 As shown, the third limiting part 3151 may have a third mounting hole 3152. Figure 4 As shown, the first abutment plate 316 has a fourth mounting hole 3161. The guide member 38 passes through the fourth mounting hole 3161, the return elastic member 37, the first mounting hole 3912, the second mounting hole 3922, and the third mounting hole 3152. The first end of the guide member 38 is fixed in the fourth mounting hole 3161, and the second end opposite to the first end is fixed in the third mounting hole 3152. For example, both the first and second ends of the guide member 38 have external threads, and both the fourth mounting hole 3161 and the third mounting hole 3152 have internal threads. The first end is threaded to the fourth mounting hole 3161, and the second end is threaded to the third mounting hole 3152, thereby fixing the opposite ends of the guide member 38 to the first abutment plate 316 and the main body 315. In other embodiments, the guide member 38 can be fixedly connected to the first abutment plate 316 and the main body 315 through other connection methods, such as spline connection, riveting, or snap-fit.

[0081] The guide 38 is arranged to pass through the return elastic member 37, the first spacer 391 and the second spacer 392, and is fixedly connected with the first stop plate 316 and the main body 315. The elastic force of the return elastic member 37 can separate the first friction member 32, the first spacer 391, the second friction member 33 and the second spacer 392, and can enhance the stability of the circumferential fixed connection between the first spacer 391, the second spacer 392 and the main body 315, and improve the braking force.

[0082] In some embodiments, as shown in Figure 4 The guide 38 can include a plurality of guides 38 surrounding the first input shaft 21. The first spacer 391 can be provided with a plurality of first limiting portions 3911 corresponding to the plurality of guides 38. The second spacer 392 can be provided with a plurality of second limiting portions 3921 corresponding to the plurality of guides 38. The main body 315 can be provided with a plurality of third limiting portions 3151 corresponding to the plurality of guides 38. The return elastic member 37 can include a plurality of groups of return elastic members 37. Each group of return elastic members 37 includes at least two return elastic members 37. Each group of return elastic members 37 corresponds to a guide 38. Each group of return elastic members 37 is arranged between two adjacent first spacers 391 and two adjacent second spacers 392. For example, as shown in Figure 4 The guide 38 can include a plurality of guides 38 surrounding the first input shaft 21. The first spacer 391 can be provided with a plurality of first limiting portions 3911 corresponding to the plurality of guides 38. The second spacer 392 can be provided with a plurality of second limiting portions 3921 corresponding to the plurality of guides 38. The main body 315 can be provided with a plurality of third limiting portions 3151 corresponding to the plurality of guides 38. The return elastic member 37 can include a plurality of groups of return elastic members 37. Each group of return elastic members 37 includes at least two return elastic members 37. Each group of return elastic members 37 corresponds to a guide 38. Each group of return elastic members 37 is arranged between two adjacent first spacers 391 and two adjacent second spacers 392. For example, as shown in

[0083] The guide 38 can provide a guide for the movement of the first spacer 391 and the second spacer 392, which is conducive to the uniform pressing of the first friction member 32 by the first spacer 391 and the uniform pressing of the second friction member 33 by the second spacer 392, thereby making the braking process more stable.

[0084] In some embodiments, as shown in Figure 2 The guide 38 can include a plurality of guides 38 surrounding the first input shaft 21. The first spacer 391 can be provided with a plurality of first limiting portions 3911 corresponding to the plurality of guides 38. The second spacer 392 can be provided with a plurality of second limiting portions 3921 corresponding to the plurality of guides 38. The main body 315 can be provided with a plurality of third limiting portions 3151 corresponding to the plurality of guides 38. The return elastic member 37 can include a plurality of groups of return elastic members 37. Each group of return elastic members 37 includes at least two return elastic members 37. Each group of return elastic members 37 corresponds to a guide 38. Each group of return elastic members 37 is arranged between two adjacent first spacers 391 and two adjacent second spacers 392. For example, as shown in Figure 3As shown, the first input shaft 21 comprises a rotating shaft 211, a gear shaft 212 and a shaft sleeve 213. The rotating shaft 211 penetrates and extends out of the motor output shaft 11, and the rotating shaft 211 comprises the preset portion 210, i.e. the portion of the rotating shaft 211 extending out of the motor output shaft 11 and located in the brake housing 31. The shaft sleeve 213 is sleeved on the preset portion 210 and the gear shaft 212, and is fixed in the circumferential direction with the rotating shaft 211 and the gear shaft 212, and the shaft sleeve 213 is arranged in a spaced manner with the motor output shaft 11. The gear shaft 212 is used to be connected with a wheel transmission, and the second friction piece 33 is sleeved on the shaft sleeve 213 and fixed in the circumferential direction with the shaft sleeve 213, so as to be fixed in the circumferential direction with the first input shaft 21. The gap between the shaft sleeve 213 and the motor output shaft 11 is 0.3-0.5mm.

[0085] The gear shaft 212 is connected with a driving wheel of the corresponding speed reducer 40. The outer periphery of the shaft sleeve 213 is provided with external splines, and the inner periphery of the second friction piece 33 and the inner periphery of the second isolation piece 392 are provided with spline grooves matched with the external splines. The second friction piece 33 and the second isolation piece 392 are connected in the circumferential direction with the shaft sleeve 213 through the cooperation of the spline grooves and the external splines. Alternatively, the outer periphery of the shaft sleeve 213 is provided with spline grooves, and the inner periphery of the second friction piece 33 and the inner periphery of the second isolation piece 392 are provided with external splines.

[0086] When the rotating shaft 211 rotates, the gear shaft 212 and the shaft sleeve 213 rotate with the rotating shaft 211, and drive the corresponding driving wheel to rotate, so as to drive the wheel connected with the first input shaft 21 to rotate.

[0087] By arranging the first input shaft 21 to comprise the fixedly connected rotating shaft 211 and gear shaft 212, the manufacturing yield of the first input shaft 21 can be improved. Since the first input shaft 21 is connected with the driving wheel, it is necessary to arrange splines on the outer periphery, and the first input shaft 21 is relatively long, and it is not easy to process splines on the outer periphery, which is prone to cause defects. By arranging the first input shaft 21 to comprise the fixedly connected rotating shaft 211 and gear shaft 212, and arranging splines on the gear shaft 212, the splines on the relatively long rotating shaft 211 can be avoided, so that the manufacturing yield and processing efficiency of the first input shaft 21 can be improved. Moreover, it is not easy to process splines or spline grooves on the relatively long rotating shaft 211, and by processing splines or spline grooves on the shaft sleeve 213 fixed in the circumferential direction with the rotating shaft 211, the manufacturing yield and processing efficiency of the first input shaft 21 can be further improved.

[0088] In some embodiments, the motor output shaft 11 is provided with external splines, and the first friction piece 32 and the first spacer 391 are provided with spline grooves, and the first friction piece 32 and the first spacer 391 are fixed in the circumferential direction of the motor output shaft 11 by the cooperation of the spline grooves and the external splines. Alternatively, the motor output shaft 11 is provided with external spline grooves, and the first friction piece 32 and the first spacer 391 are provided with external splines.

[0089] In some embodiments, the guide 38 is arranged through the return elastic piece 37 and the hand brake piston 351 and fixed to the main body 315. The return elastic piece 37 is arranged on the side of the hand brake piston 351 close to the second friction piece 33. One end of the return elastic piece 37 abuts against the guide 38, and the other end abuts against the hand brake piston 351. The hand brake piston 351 can move in the axial direction of the guide 38. When the piston driving mechanism 352 drives the second friction piece 33 to abut against the first friction piece 32 and be fixed relative to the brake shell 31, the hand brake piston 351 compresses the return elastic piece 37 in the direction close to the second friction piece 33 and pushes the second friction piece 33 to abut against the first friction piece 32. When the piston driving mechanism 352 stops driving the second friction piece 33 to abut against the first friction piece 32, the hand brake piston 351 moves away from the second friction piece 33 under the elastic force of the return elastic piece 37, so that the second friction piece 33 is separated from the first friction piece 32 and can rotate relative to the brake shell 31.

[0090] In some embodiments, as shown in Figure 3 The brake 30 further includes a partition plate 30a between the first friction piece 32 and the second friction piece 33. The partition plate 30a is sleeved on the shaft sleeve 213 and fixed in the circumferential direction of the shaft sleeve 213. When the first input shaft 21 rotates, the partition plate 30a rotates with the first input shaft 21.

[0091] The brake assembly 34 is used to press the second friction piece 33, the partition plate 30a and the first friction piece 32, so that the second friction piece 33, the partition plate 30a and the first friction piece 32 abut against each other and are fixed relative to the brake shell 31.

[0092] In some embodiments, the brake 30 comprises the first spacer 391 and the second spacer 392, and when the brake assembly 34 is braking, the second friction piece 33, the second spacer 392, the partition plate 30a, the first friction piece 32 and the first spacer 391 are pressed to be tightly against each other and fixed relative to the brake housing 31, so as to brake the first input shaft 21 and the motor output shaft 11. When the brake assembly 34 is unbraking, the second friction piece 33, the second spacer 392, the partition plate 30a, the first friction piece 32 and the first spacer 391 are separated, so that the second friction piece 33, the first friction piece 32 and the partition plate 30a are rotatable relative to the brake housing 31, thereby unbraking the first input shaft 21 and the motor output shaft 11.

[0093] In some embodiments, the partition plate 30a is arranged between the first spacer 391 closest to the second friction piece 33 and the second spacer 392 closest to the first friction piece 32, for example, as shown in Figure 3 In some embodiments, the partition plate 30a is arranged between the first spacer 391 closest to the second friction piece 33 and the second spacer 392 closest to the first friction piece 32, for example, as shown in

[0094] In some embodiments, the projection of the brake 30 on the first input shaft 21 covers the gap between the motor output shaft 11 and the shaft sleeve 213, so that when the service brake or the parking brake is braking, the service brake piston 351 and the parking brake piston 361 are moved in the A direction for a short distance to push the second friction piece 33, the second spacer 392, the partition plate 30a, the first friction piece 32 and the first spacer 391 to be tightly against each other, and the first friction piece 32 and the first spacer 391 are quickly tightly against each other due to the pressing of the partition plate 30a. That is, the service brake piston 351 and the parking brake piston 361 are moved in the A direction for a short distance to brake. Therefore, the movement stroke of the service brake piston 351 and the parking brake piston 361 in the A direction during braking can be further shortened, which is beneficial to the quick braking of the brake 30 and further improves the braking efficiency. In addition, the partition plate 30a can ensure that the first friction piece 32 and the first spacer 391 are tightly against each other by pushing the second spacer 392 and the second friction piece 33, thereby improving the braking reliability.

[0095] When the vehicle is running, the parking brake piston cavity 363 is filled with hydraulic oil, the hydraulic oil pushes the parking brake piston 361 away from the second friction piece 33 and compresses the parking elastic piece 362, the service brake piston cavity 353 is not filled with hydraulic oil, the second friction piece 33, the second isolation piece 392, the partition plate 30a, the first isolation piece 391 and the first friction piece 32 are separated, and the motor output shaft 11, the first input shaft 21 and the second input shaft 22 are in a free rotation state.

[0096] When the vehicle is braking, for example, braking or decelerating, the service brake piston cavity 353 is filled with hydraulic oil, the hydraulic oil pushes the service brake piston 351 to approach the second friction piece 33 and extrudes the second friction piece 33, the second isolation piece 392, the partition plate 30a, the first isolation piece 391 and the first friction piece 32 to abut against each other, so as to reduce the rotation speed or stop the rotation of the motor output shaft 11, the first input shaft 21 and the second input shaft 22.

[0097] When the vehicle is parking, for example, parking during parking, the parking brake piston cavity 363 is drained, the parking elastic piece 362 pushes the parking brake piston 361 to approach the second friction piece 33 and extrudes the second friction piece 33, the second isolation piece 392, the partition plate 30a, the first isolation piece 391 and the first friction piece 32 to abut against each other, so as to reduce the rotation speed or stop the rotation of the motor output shaft 11, the first input shaft 21 and the second input shaft 22.

[0098] Please refer to Figure 8 The structural block diagram of the vehicle 200 provided by an embodiment of the present application is shown. As shown in the figure, the vehicle 200 comprises the drive axle 100 of any of the foregoing embodiments. The vehicle further comprises wheels, a vehicle body and the like. Figure 8

[0099] In some embodiments, the vehicle 200 can be a forklift, a passenger car, a passenger vehicle, a truck, a tractor and the like, and can also be other types of vehicles.

[0100] The above is the implementation of the embodiments of the present application. It should be noted that, for those skilled in the art, without departing from the principles of the embodiments of the present application, some improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present application.​

Claims

1. A drive axle for driving a vehicle, characterized in that The drive axle comprises a motor, a first input shaft, a second input shaft and a brake, the motor comprises a motor output shaft, the first input shaft is arranged through the motor output shaft and is rotatable relative to the motor output shaft, the motor output shaft is in transmission connection with the first input shaft and the second input shaft, and the first input shaft and the second input shaft are respectively in transmission connection with wheels of the vehicle; the brake comprises: a brake housing located at one side of the motor, at least part of the first input shaft and the motor output shaft being located in the brake housing, the brake housing being in fixed connection with a vehicle body of the vehicle; a first friction member sleeved on a part of the motor output shaft located in the brake housing and fixed in a circumferential direction of the motor output shaft; a second friction member sleeved on a preset part of the first input shaft, the preset part of the first input shaft extending out of the motor output shaft and being located in the brake housing, the second friction member being fixed in a circumferential direction of the first input shaft and being arranged in a spaced manner with the first friction member; a brake assembly arranged in the brake housing and used for pressing the second friction member and the first friction member, so that the second friction member and the first friction member abut against each other and are fixed relative to the brake housing, to brake the motor output shaft and the first input shaft, thereby braking the wheels connected with the first input shaft and the second input shaft.

2. The drive axle of claim 1, wherein, The brake assembly comprises a service brake assembly, the service brake assembly comprises a service brake piston located at a side of the second friction member away from the first friction member and movable in an axial direction of the first input shaft, and a piston driving mechanism used for driving the service brake piston to press the second friction member and the first friction member, so that the second friction member and the first friction member abut against each other and are fixed relative to the brake housing; and / or The brake assembly comprises a parking brake assembly, the parking brake assembly comprises a parking brake piston located at a side of the second friction member away from the first friction member and movable in an axial direction of the first input shaft, and a parking elastic member, opposite ends of the parking elastic member being in abutment with a side of the parking brake piston away from the second friction member and the brake housing respectively, the parking brake piston being pressed to press the second friction member and the first friction member by an acting force of the parking elastic member, so that the second friction member and the first friction member abut against each other and are fixed relative to the brake housing.

3. The drive axle of claim 2, wherein, The piston driving mechanism comprises a service brake piston cavity formed by an outer surface of the service brake piston and an inner surface of the brake housing, the service brake piston cavity being used for being filled with liquid to drive the service brake piston to press the second friction member and the first friction member.

4. The drive axle of claim 2, wherein, The brake assembly comprises a service brake assembly, the brake further comprises a return elastic member and a guide member penetrating the return elastic member, the guide member is connected with the brake shell, the return elastic member can be elastically deformed along the axial direction of the first input shaft, and the return elastic member is used to drive the service brake piston away from the second friction member when the piston driving mechanism stops driving the service brake piston to press the second friction member and the first friction member, so that the second friction member is separated from the first friction member and can rotate relative to the brake shell, thereby stopping the service brake assembly from braking the motor output shaft and the first input shaft.

5. The drive axle of claim 4, wherein, The brake further comprises a spacer, the spacer is located on the side of the service brake piston close to the second friction member and is fixed in the circumferential direction with the brake shell, the guide member penetrates the return elastic member and the spacer, the service brake piston and / or the parking brake piston is used to press against the spacer, the second friction member and the first friction member, so that the second friction member and the first friction member are pressed against each other and fixed relative to the brake shell, and the return elastic member is used to drive the service brake piston away from the second friction member when the piston driving mechanism stops driving the service brake piston to press the second friction member and the first friction member, so that the second friction member, the first friction member and the spacer are separated, and the second friction member can rotate relative to the brake shell.

6. The drive axle of claim 5, wherein, The spacer comprises a first spacer and a second spacer, the first spacer is sleeved on the motor output shaft and fixed in the circumferential direction with the brake shell, the second spacer is sleeved on a preset portion of the first input shaft and fixed in the circumferential direction with the brake shell, and the guide member penetrates the first spacer, the second spacer and the return elastic member.

7. The drive axle of claim 6, wherein, The return elastic member comprises at least two, the first spacer comprises at least two, the first spacer and the first friction member are arranged alternately, and the return elastic member is arranged between adjacent two first spacers; and / or the second spacer comprises at least two, the second spacer and the second friction member are arranged alternately, and the return elastic member is arranged between adjacent two second spacers.

8. The drive axle of claim 5 wherein, The outer periphery of the spacer is provided with a first circumferential limiting portion, the inner periphery of the brake shell is provided with a second circumferential limiting portion, the first circumferential limiting portion and the second circumferential limiting portion are matched to fix the spacer and the brake shell in the circumferential direction, and the guide member penetrates the return elastic member, the first circumferential limiting portion and the second circumferential limiting portion.

9. The drive axle of claim 2, wherein, The brake assembly includes the parking brake assembly, an outer surface of the parking brake piston and an inner surface of the brake shell form a parking brake piston cavity, the parking brake piston cavity is used to fill liquid to drive the parking brake piston away from the second friction piece and compress the parking elastic piece, so that the second friction piece is separated from the first friction piece and rotatable relative to the brake shell, so that the parking brake assembly stops braking the motor output shaft and the first input shaft, wherein when the parking brake piston cavity releases liquid, the parking elastic piece drives the parking brake piston to press the second friction piece, so that the second friction piece and the first friction piece are tightly contacted with each other and fixed relative to the brake shell.

10. The drive axle of claim 1, wherein, The first input shaft includes a rotating shaft, a gear shaft and a shaft sleeve, the rotating shaft is arranged through and extends out of the motor output shaft, the rotating shaft includes the preset part, the shaft sleeve is sleeved on the preset part and the gear shaft and fixed circumferentially with the rotating shaft and the gear shaft, the shaft sleeve is arranged spaced apart from the motor output shaft, the gear shaft is used to be connected in transmission with a wheel, the second friction piece is sleeved on the shaft sleeve and fixed circumferentially with the shaft sleeve, so as to be fixed circumferentially with the first input shaft.

11. The drive axle of claim 10, wherein, The brake further includes a partition plate between the first friction piece and the second friction piece, the partition plate is sleeved on the shaft sleeve and fixed circumferentially with the shaft sleeve, the brake assembly is used to press the second friction piece, the partition plate and the first friction piece, so that the second friction piece, the partition plate and the first friction piece are tightly contacted with each other and fixed relative to the brake shell.

12. A vehicle characterized by comprising: The vehicle includes the drive axle as claimed in any one of claims 1-11.

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