Double-drive wet type electric axle with split type shell braking device

Abstract

The utility model discloses a double-drive wet-type electric axle with a split-type shell brake device, which comprises two motors, a brake device and a hub assembly, and the opposite wall surfaces of the two motors are inner end surfaces; a protruding positioning block is formed in the middle of the inner end face of one motor, a positioning groove is formed in the middle of the end face of the protruding positioning block, an annular protruding part is formed in the middle of the inner end face of the other motor, the annular protruding part is inserted into the positioning groove in a sleeved mode, and the outer side wall of the annular protruding part is close to or tightly attached to the inner side wall of the positioning groove. The two motors are fixed; double motors are adopted for driving, and wheels connected with the two hub assemblies can rotate differently through different rotating speeds of the two motors, so that steering is achieved; the motor and the hub assembly are connected through the parking brake shell and the service brake shell which are split, machining and installation are convenient, the liquid leakage problem is few, and disassembly, repair and maintenance are convenient.

Description

Technical field:

[0001] The utility model relates to the technical field related to drive axles, and more specifically to a double-drive wet electric axle with a split housing brake device. Background technology:

[0002] With the development of the domestic forklift industry, the design and manufacture of wet drive axles have gradually matured. As one of the main drive systems of forklifts, drive axles are used in various types of forklifts. Their braking systems are generally divided into service brakes and parking brakes. The function of service brakes is to apply braking force to the wheels, thereby slowing down or stopping the vehicle; the function of parking brakes is to ensure that the vehicle can be parked on flat ground or on a slope, and can also be used for braking in emergency situations.

[0003] An electric drive axle assembly with Chinese patent application number 202311404674.3 includes a motor, a bridge housing, a differential and a hub unit assembly; two bridge housings are respectively installed on both sides of the motor, and two hub unit assemblies are respectively installed on two bridge housings; a differential is installed in one bridge housing, and the motor transmits power to the sun gear shafts of the two hub unit assemblies through the differential;

[0004] A driving brake structure and a parking brake structure are both installed in the bridge housing, and both the driving brake structure and the parking brake structure require oil to realize the movement of the driving brake piston and the parking brake piston therein. The parking oil cylinder body and the driving oil cylinder body for installing the driving brake piston and the parking brake piston must be installed therein first, and then the driving brake piston and the parking brake piston are installed in the driving oil cylinder body and the parking oil cylinder body. For the circulation of oil, it is necessary to process the circulation holes on the parking oil cylinder body and the driving oil cylinder body. At the same time, it is also necessary to process the oil holes on the bridge housing. It must be ensured that the oil holes of the bridge housing correspond to the circulation holes of the parking oil cylinder body or the driving oil cylinder body, and a connector must be installed between the two for oil circulation. The installation and processing are troublesome and require high precision. In addition, due to the large number of connected parts, the assembly requirements are high. If the assembly or processing is not in place, leakage will occur. In addition, this structure increases the difficulty of disassembly and assembly during maintenance, and maintenance is troublesome.

[0005] Meanwhile, the existing ones are generally driven by a single motor, which requires a differential structure, making the overall structure complex. Utility model content:

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a dual-drive wet electric axle with a split housing brake device, which is driven by dual motors. Through the different rotation speeds of the two motors, the wheels connected to the two hub assemblies can rotate differently to achieve steering; the motor and the hub assembly are connected by a split parking brake housing and a service brake housing, which is easy to process and install, has few leakage problems, and is convenient to disassemble, repair and maintain.

[0007] The solution of the utility model to solve the technical problem is:

[0008] A dual-drive wet electric bridge with a split housing brake device comprises two motors, a brake device and a hub assembly, wherein the opposite walls of the two motors are inner end faces; a raised positioning block is formed in the middle of the inner end face of one motor, a positioning groove is formed in the middle of the end face of the raised positioning block, and an annular raised portion is formed in the middle of the inner end face of the other motor, the annular raised portion is inserted into the positioning groove, the outer side wall of the annular raised portion is close to or tightly attached to the inner side wall of the positioning groove, and the two motors are fixed;

[0009] The outer ends of the two motors are both equipped with brake devices, and the outer ends of the two brake devices are both equipped with wheel hub assemblies;

[0010] The brake device comprises a service brake housing and a parking brake housing, wherein the inner end of the service brake housing is fixed to a corresponding end face of the motor, the parking brake housing is fixed to the outer end of the service brake housing, and the inner end of the housing of the wheel hub assembly is fixed to the outer end of the parking brake housing;

[0011] A positioning and mounting sleeve portion extending outward is formed in the middle of the outer end of the service brake housing, the service brake piston is inserted into the positioning and mounting sleeve portion, and the parking brake piston is sleeved on the outside of the positioning and mounting sleeve portion;

[0012] A stepped through hole extending outward is formed in the middle of the right end surface of the parking brake housing, and the parking brake piston is inserted into the stepped through hole;

[0013] A first sealing ring and a second sealing ring are sandwiched between the service brake piston and the positioning and mounting sleeve body, a first oil through hole is formed on the inner side wall of the positioning and mounting sleeve body between the first sealing ring and the second sealing ring, and the outer end of the first oil through hole extends out of the outer side wall of the service brake housing;

[0014] A third sealing ring and a fourth sealing ring are sandwiched between the parking brake piston and the inner side wall of the stepped through hole, and a second oil through hole extending outwardly from the outer side wall of the parking brake housing is formed on the inner side wall of the stepped through hole between the third sealing ring and the fourth sealing ring.

[0015] An annular groove is formed on the inner side wall of the outer end of the positioning and mounting sleeve body, a radial extension portion is formed on the outer side wall of the middle part of the service brake piston, the radial extension portion is inserted into the annular groove, the outer side wall of the inner end of the service brake piston is close to or close to the inner side wall of the inner end of the positioning and mounting sleeve body, the outer side wall of the radial extension portion is close to or close to the inner side wall of the annular groove, a first sealing ring is nested in the sealing groove formed on the inner side wall of the annular groove, the inner wall surface of the first sealing ring is pressed against the outer side wall of the radial extension portion, a second sealing ring is nested in the sealing groove formed on the inner side wall of the inner end of the positioning and mounting sleeve body, and the inner wall surface of the second sealing ring is pressed against the outer side wall of the inner end of the service brake piston;

[0016] A main radial extension edge is formed on the outer side wall of the outer end of the service brake piston, and the main radial extension edge is inserted into the outer end of the central through hole of the parking brake piston, and the inner end of the main radial extension edge faces the outer end surface of the positioning and mounting sleeve body.

[0017] The stepped through hole is formed with a first hole segment, a second hole segment, a third hole segment, a fourth hole segment and a fifth hole segment in sequence from the inside to the outside, and the inner diameter thereof gradually decreases from the inside to the outside;

[0018] The parking brake piston is inserted into the first hole section and the second hole section, and a first radially extending edge is formed on the outer wall of the inner end of the parking brake piston. The outer wall of the first radially extending edge is close to or close to the inner wall of the first hole section, and the outer wall of the parking brake piston is close to or close to the inner wall of the second hole section. A third sealing ring is nested in the sealing groove on the outer wall of the outside of the parking brake piston, and a fourth sealing ring is nested in the sealing groove on the outer wall of the first radially extending edge. The outer wall surface of the third sealing ring is pressed against the inner wall of the second hole section, and the outer wall surface of the fourth sealing ring is pressed against the inner wall of the first hole section.

[0019] The right end surface of the parking brake piston is formed with a plurality of concave holes, and the return spring is inserted into the corresponding concave holes, the outer end of the return spring is pressed against the inner end surface of the corresponding concave hole, and the inner end of the return spring is pressed against the outer end surface of the service brake housing;

[0020] The third hole section has a brake pressure disc inserted in it, and the fourth hole section has a plurality of inner friction plates and outer friction plates inserted in it, all of which are arranged at intervals, wherein the innermost end and the outermost end are both outer friction plates, the outer end surface of the brake pressure disc is pressed against the inner end surface of the innermost outer friction plate, and the inner end surface of the brake pressure disc is pressed against the outer end surface of the parking brake piston;

[0021] The end of the output shaft of the motor extends into the middle through hole and the positioning and mounting sleeve portion of the corresponding service brake housing and is connected to the output shaft. The middle through hole and the positioning and mounting sleeve portion of the service brake housing are communicated with each other. The output shaft is located in the parking brake housing. The middle part of the output shaft is movably connected to the fifth hole section of the parking brake housing through a bearing, and the outer end of the output shaft extends into the housing of the corresponding wheel hub assembly.

[0022] A transmission gear is installed in the middle of the output shaft, the corresponding inner friction plate and outer friction plate are inserted into the transmission gear, and the protrusion formed on the inner wall of the corresponding outer friction plate is inserted into the tooth groove of the corresponding transmission gear.

[0023] The outer wall of the end of the output shaft of the motor is formed with a spline, and the middle part of the inner end of the output shaft is formed with a spline hole. The end of the output shaft of the motor is inserted into the corresponding spline hole, and the spline is inserted into the spline groove on the inner wall of the corresponding spline hole and matches with each other.

[0024] The outstanding effects of the utility model are:

[0025] 1. It adopts dual motor drive. Through the different speeds of the two motors, the wheels connected to the two hub assemblies can rotate differently to achieve steering;

[0026] 2. It is connected between the motor and the wheel hub assembly through a split parking brake housing and a service brake housing. It only needs to directly process the first oil through hole and the second oil through hole on the parking brake housing and the service brake housing to push the internal parking brake piston and the service brake piston to achieve the corresponding effect. It is easy to process and install, has few leakage problems, and is easy to disassemble, repair and maintain. Description of the drawings:

[0027] Figure 1 It is a partial structural schematic diagram of the utility model;

[0028] Figure 2 yes Figure 1 A partial enlarged view of . Specific implementation method:

[0029] For example, see Figure 1 to Figure 2As shown, it includes two motors 10, a brake device 20 and a hub assembly 30, wherein the opposite wall surfaces of the two motors 10 are inner end surfaces; a raised positioning block 18 is formed in the middle of the inner end surface of one motor 10, and a positioning groove is formed in the middle of the end surface of the raised positioning block 18; an annular protrusion 19 is formed in the middle of the inner end surface of the other motor 10, and the annular protrusion 19 is inserted into the positioning groove, and the outer side wall of the annular protrusion 19 is close to or tightly attached to the inner side wall of the positioning groove, and the positioning is achieved by the cooperation between the raised positioning block 18 and the annular protrusion 19; the inner end surfaces of the two motors 10 are close to each other and can be fixed on the same external connecting frame or connecting plate for fixing (since the connecting frame or connecting plate connected to the outside at the same time is an existing conventional method, it will not be described in detail, and the connecting frame or connecting plate is omitted and not shown in the accompanying drawings);

[0030] The outer ends of the two motors 10 are both equipped with brake devices 20, and the outer ends of the two brake devices 20 are both equipped with hub assemblies 30;

[0031] The braking device 20 includes a service brake housing 21 and a parking brake housing 22. The inner end of the service brake housing 21 is fixed to a corresponding end face of the motor 10; the parking brake housing 22 is fixed to the outer end of the service brake housing 21, and a sealing ring is clamped between the two; the inner end of the housing of the wheel hub assembly 30 is fixed to the outer end of the parking brake housing 22; the wheel hub assembly 30 has the same structure as the existing one and is not described in detail here.

[0032] The service brake housing 21 is formed with a positioning and mounting sleeve 211 extending outward at the middle of the outer end thereof, the service brake piston 23 is inserted into the positioning and mounting sleeve 211, and the parking brake piston 24 is sleeved on the outer portion of the positioning and mounting sleeve 211;

[0033] A stepped through hole 221 extending outward is formed in the middle of the right end surface of the parking brake housing 22, and the parking brake piston 24 is inserted into the stepped through hole 221;

[0034] A first sealing ring 1 and a second sealing ring 2 are sandwiched between the service brake piston 23 and the positioning and mounting sleeve body 211. A first oil through hole 100 is formed on the inner side wall of the positioning and mounting sleeve body 211 between the first sealing ring 1 and the second sealing ring 2. The outer end of the first oil through hole 100 extends out of the outer side wall of the service brake housing 21.

[0035] The third sealing ring 3 and the fourth sealing ring 4 are sandwiched between the parking brake piston 24 and the inner side wall of the stepped through hole 221 , and a second oil through hole 200 extending outwardly from the outer side wall of the parking brake housing 22 is formed on the inner side wall of the stepped through hole 221 between the third sealing ring 3 and the fourth sealing ring 4 .

[0036] Further, an annular groove is formed on the inner side wall of the outer end of the positioning and mounting sleeve body 211, and a radial extension portion 212 is formed on the outer side wall of the middle part of the service brake piston 23. The radial extension portion 212 is inserted into the annular groove, and the outer side wall of the inner end of the service brake piston 23 is close to or close to the inner side wall of the inner end of the positioning and mounting sleeve body 211, and the outer side wall of the radial extension portion 212 is close to or close to the inner side wall of the annular groove. A first sealing ring 1 is nested in the sealing groove formed on the inner side wall of the annular groove, and the inner side wall of the first sealing ring 1 is pressed against the outer side wall of the radial extension portion 212. A second sealing ring 2 is nested in the sealing groove formed on the inner side wall of the inner end of the positioning and mounting sleeve body 211, and the inner side wall of the second sealing ring 2 is pressed against the outer side wall of the inner end of the service brake piston 23. A first oil through hole 100 is formed on the inner side wall and inner end surface of the inner end surface of the annular groove;

[0037] A main radial extension edge 213 is formed on the outer side wall of the outer end of the service brake piston 23, and the main radial extension edge 213 is inserted into the outer end of the middle through hole of the parking brake piston 24, and the inner end of the main radial extension edge 213 faces the outer end surface of the positioning and mounting sleeve body 211.

[0038] Furthermore, the stepped through hole 221 is formed with a first hole segment 2211, a second hole segment 2212, a third hole segment 2213, a fourth hole segment 2214 and a fifth hole segment 2215 from the inside to the outside, and the inner diameter thereof gradually decreases from the inside to the outside;

[0039] The parking brake piston 24 is inserted into the first hole section 2211 and the second hole section 2212, and a first radial extension edge 241 is formed on the outer wall of the inner end of the parking brake piston 24. The outer wall of the first radial extension edge 241 is close to or close to the inner wall of the first hole section 2211, and the outer wall of the parking brake piston 24 is close to or close to the inner wall of the second hole section 2212. A third sealing ring 3 is nested in the sealing groove on the outer wall of the outside of the parking brake piston 24, and a fourth sealing ring 4 is nested in the sealing groove on the outer wall of the first radial extension edge 241. The outer wall surface of the third sealing ring 3 is pressed against the inner wall of the second hole section 2212, and the outer wall surface of the fourth sealing ring 4 is pressed against the inner wall of the first hole section 2211. A second oil through hole 200 is formed on the inner wall and outer end surface of the outer end surface of the first hole section 2211.

[0040] Furthermore, a plurality of concave holes are formed on the right end surface of the parking brake piston 24, and the return spring 5 is inserted into the corresponding concave holes, and the outer end of the return spring 5 is applied to the inner end surface of the corresponding concave hole, and the inner end of the return spring 5 is applied to the outer end surface of the service brake housing 21;

[0041] The third hole section 2213 is inserted with a brake pressure disc 25, and the edge of the brake pressure disc 25 has an insertion hole, on which a positioning pin is inserted, the outer end of the positioning pin is clamped and fixed on the outer end surface of the third hole section 2213, and the inner end of the positioning pin is inserted into the corresponding insertion hole on the outer end surface of the parking brake piston 24, and the outer end of the main radial extension edge 213 faces the inner end surface of the corresponding brake pressure disc 25. A plurality of inner friction plates 26 and outer friction plates 27 are inserted in the fourth hole section 2214, and all the inner friction plates 26 and outer friction plates 27 are arranged at intervals, wherein the innermost end and the outermost end are both outer friction plates 27, the outer end surface of the brake pressure disc 25 is pressed against the inner end surface of the innermost outer friction plate 27, and the inner end surface of the brake pressure disc 25 is pressed against the outer end surface of the parking brake piston 24;

[0042] There is a displacement distance 6 between the outer end surface of the first radially extending edge 241 and the outer end surface of the first hole section 2211 .

[0043] Furthermore, the end of the output shaft of the motor 10 extends into the middle through hole and the positioning and mounting sleeve body 211 of the corresponding service brake housing 21 and is connected to the output shaft 28. The middle through hole and the positioning and mounting sleeve body 211 of the service brake housing 21 are communicated with each other. The output shaft 28 is located in the parking brake housing 22. The middle part of the output shaft 28 is movably connected to the fifth hole section 2215 of the parking brake housing 22 through a bearing, and the outer end of the output shaft 28 extends into the housing of the corresponding wheel hub assembly 30.

[0044] Furthermore, a transmission gear 281 is installed in the middle of the output shaft 28, and the corresponding inner friction plate 26 and outer friction plate 27 are inserted into the transmission gear 281. The protrusion formed on the inner wall of the corresponding outer friction plate 27 is inserted into the tooth groove of the corresponding transmission gear 281, and a spline groove is formed on the outer wall of the corresponding inner friction plate 26. A spline protrusion is formed on the inner wall of the fourth hole section 2214, which is inserted into the spline groove, and the two match each other.

[0045] Furthermore, a spline is formed on the outer wall of the end of the output shaft of the motor 10, and a spline hole is formed in the middle of the inner end of the output shaft 28. The end of the output shaft of the motor 10 is inserted into the corresponding spline hole, and the spline is inserted into the spline groove on the inner wall of the corresponding spline hole and matches with each other.

[0046] Furthermore, an annular extension portion 239 extending radially inward is formed on the inner side wall of the inner end of the service brake piston 23, and a plurality of through holes are formed on the annular extension portion 239. The rods of a plurality of fixing bolts are inserted into the corresponding through holes, and the threaded connection portion formed at the end of the rod of the fixing bolt is threadedly connected to the middle portion of the outer end of the service brake housing 21. The compression spring 9 is inserted into the rod of the fixing bolt, and one end of the compression spring is applied to the rotating portion of the fixing bolt, and the other end of the compression spring is applied to the outer end surface of the annular extension portion 239 (only one of this structure is shown in the accompanying drawings).

[0047] In this embodiment, the brake device 20 includes a service brake housing 21 and a parking brake housing 22. The two housings can be disassembled, which greatly reduces the difficulty of processing. Moreover, the two are spliced ​​together for easy disassembly and installation, and also for easy repair and maintenance.

[0048] Similarly, the service brake housing 21 and the parking brake housing 22 are split structures, so it is also very convenient to install the service brake piston 23 and the parking brake piston 24 therein. Correspondingly, it is only necessary to process the first oil through hole 100 on the inner wall of the positioning and mounting sleeve 211 between the first sealing ring 1 and the second sealing ring 2, and the outer end of the first oil through hole 100 extends out of the outer wall of the service brake housing 21; and process the second oil through hole 200 extending outwardly from the outer wall of the parking brake housing 22 on the inner wall of the stepped through hole 221 between the third sealing ring 3 and the fourth sealing ring 4. The first oil through hole 100 and the second oil through hole 200 are easy to process, and only the first oil through hole 100 and the second oil through hole 200 need to be processed to realize the movement control of the service brake piston 23 and the parking brake piston 24, which greatly reduces the processing difficulty and also reduces the oil leakage problem.

[0049] When this embodiment is in use, it can control the output shafts of the two motors 10 to rotate at different speeds, so that the wheels connected to the two hub assemblies 30 (which are conventional structures and will not be described in detail here) rotate at different speeds, thereby meeting the steering needs of the vehicle and achieving steering.

[0050] When the present embodiment is in use, during driving, the second oil through hole 200 is always filled with oil, so that all the return springs 5 ​​are compressed, and the parking brake piston 24 moves inward so that it does not press against the brake pressure plate 25. At this time, the inner friction plate 26 and the outer friction plate 27 are not pressed against each other, so that the left output shaft 282 and the output shaft 283 rotate normally, and the normal operation of the vehicle is realized;

[0051] When service braking is required, oil flows into the first oil through hole 100, so that the service brake piston 23 moves outward, the compression spring is compressed, and the service brake piston 23 presses against the brake pressure plate 25, so that it moves outward and presses against the innermost outer friction plate 27, pressing all the corresponding inner friction plates 26 and outer friction plates 27, thereby achieving braking;

[0052] When braking is required for parking, oil stops flowing into the first oil through hole 100 and the second oil through hole 200, and all the return springs 5 ​​elastically recover, so that the parking brake piston 24 moves outward and presses against the brake pressure disc 25, so that it moves outward and presses against the innermost outer friction plate 27, pressing all the corresponding inner friction plates 26 and outer friction plates 27 to achieve braking.

[0053] When no oil enters the first oil through hole 100 , the compression spring 9 presses the annular extension 239 of the service brake piston 23 against the middle of the outer end surface of the service brake housing 21 , so that it does not press against the brake pressure disc 25 .

[0054] The outer ends of the first oil through hole 100 and the second oil through hole 200 are sealed with plugs when not connected.

Claims

1. A dual-drive wet electric axle with a split housing brake device, comprising two motors (10), a brake device (20) and a hub assembly (30), characterized in that: The opposing wall surfaces of the two motors (10) are inner end surfaces; a raised positioning block (18) is formed in the middle of the inner end surface of one motor (10), a positioning groove is formed in the middle of the end surface of the raised positioning block (18), and an annular raised portion (19) is formed in the middle of the inner end surface of the other motor (10), the annular raised portion (19) is inserted into the positioning groove, the outer side wall of the annular raised portion (19) is close to or tightly attached to the inner side wall of the positioning groove, and the two motors (10) are fixed; The outer ends of the two motors (10) are both equipped with brake devices (20), and the outer ends of the two brake devices (20) are both equipped with wheel hub assemblies (30); The brake device (20) comprises a service brake housing (21) and a parking brake housing (22), wherein the inner end of the service brake housing (21) is fixed to a corresponding end face of the motor (10), the parking brake housing (22) is fixed to the outer end of the service brake housing (21), and the inner end of the housing of the wheel hub assembly (30) is fixed to the outer end of the parking brake housing (22); A positioning and mounting sleeve (211) extending outward is formed in the middle of the outer end of the service brake housing (21), the service brake piston (23) is inserted into the positioning and mounting sleeve (211), and the parking brake piston (24) is sleeved on the outside of the positioning and mounting sleeve (211); A stepped through hole (221) extending outward is formed in the middle of the right end surface of the parking brake housing (22), and the parking brake piston (24) is inserted into the stepped through hole (221); A first sealing ring (1) and a second sealing ring (2) are clamped between the service brake piston (23) and the positioning and mounting sleeve body (211); a first oil through hole (100) is formed on the inner side wall of the positioning and mounting sleeve body (211) between the first sealing ring (1) and the second sealing ring (2); and an outer end of the first oil through hole (100) extends out of the outer side wall of the service brake housing (21); A third sealing ring (3) and a fourth sealing ring (4) are sandwiched between the parking brake piston (24) and the inner side wall of the stepped through hole (221); a second oil through hole (200) is formed on the inner side wall of the stepped through hole (221) between the third sealing ring (3) and the fourth sealing ring (4) and extends outward from the outer side wall of the parking brake housing (22).

2. A dual-drive wet electric axle with a split housing brake device according to claim 1, characterized in that: An annular groove is formed on the inner side wall of the outer end of the positioning and mounting sleeve (211), and a radial extension portion (212) is formed on the outer side wall of the middle part of the service brake piston (23). The radial extension portion (212) is inserted into the annular groove. The outer side wall of the inner end of the service brake piston (23) is close to or in close contact with the inner side wall of the inner end of the positioning and mounting sleeve (211). The outer side wall of the radial extension portion (212) is close to or in close contact with the inner side wall of the annular groove. A first sealing ring (1) is embedded in the sealing groove formed on the inner side wall of the annular groove. The inner wall surface of the first sealing ring (1) is pressed against the outer side wall of the radial extension portion (212). A second sealing ring (2) is embedded in the sealing groove formed on the inner side wall of the inner end of the positioning and mounting sleeve (211), and the inner wall surface of the second sealing ring (2) is pressed against the outer side wall of the inner end of the service brake piston (23). A main radial extension edge (213) is formed on the outer side wall of the outer end of the service brake piston (23), and the main radial extension edge (213) is inserted into the outer end of the middle through hole of the parking brake piston (24), and the inner end of the main radial extension edge (213) faces the outer end surface of the positioning and mounting sleeve body (211).

3. The dual-drive wet electric axle with a split housing brake device according to claim 1, characterized in that: The stepped through hole (221) is formed with a first hole segment (2211), a second hole segment (2212), a third hole segment (2213), a fourth hole segment (2214) and a fifth hole segment (2215) in sequence from the inside to the outside, and the inner diameter thereof gradually decreases from the inside to the outside; The parking brake piston (24) is inserted into the first hole section (2211) and the second hole section (2212); a first radial extension edge (241) is formed on the outer wall of the inner end of the parking brake piston (24); the outer wall of the first radial extension edge (241) is close to or in close contact with the inner wall of the first hole section (2211); the outer wall of the parking brake piston (24) is close to or in close contact with the inner wall of the second hole section (2212); a third sealing ring (3) is embedded in the sealing groove on the outer wall of the outside of the parking brake piston (24); a fourth sealing ring (4) is embedded in the sealing groove on the outer wall of the first radial extension edge (241); the outer wall surface of the third sealing ring (3) is pressed against the inner wall of the second hole section (2212); and the outer wall surface of the fourth sealing ring (4) is pressed against the inner wall of the first hole section (2211).

4. A dual-drive wet electric axle with a split housing brake device according to claim 3, characterized in that: The right end surface edge of the parking brake piston (24) is formed with a plurality of concave holes, and the return spring (5) is inserted into the corresponding concave holes, the outer end of the return spring (5) is pressed against the inner end surface of the corresponding concave hole, and the inner end of the return spring (5) is pressed against the outer end surface of the service brake housing (21); A brake pressure disc (25) is inserted into the third hole section (2213), and a plurality of inner friction plates (26) and outer friction plates (27) are inserted into the fourth hole section (2214), wherein all inner friction plates (26) and outer friction plates (27) are arranged at intervals, wherein the innermost end and the outermost end are both outer friction plates (27), the outer end surface of the brake pressure disc (25) is pressed against the inner end surface of the innermost outer friction plate (27), and the inner end surface of the brake pressure disc (25) is pressed against the outer end surface of the parking brake piston (24); There is a displacement distance (6) between the outer end surface of the first radially extending edge (241) and the outer end surface of the first hole section (2211).

5. The dual-drive wet electric axle with a split housing brake device according to claim 4, characterized in that: The end of the output shaft of the motor (10) extends into the middle through hole and the positioning and mounting sleeve body (211) of the corresponding service brake housing (21) and is connected to the output shaft (28); the middle through hole and the positioning and mounting sleeve body (211) of the service brake housing (21) are in communication; the output shaft (28) is located in the parking brake housing (22); the middle of the output shaft (28) is movably connected to the fifth hole section (2215) of the parking brake housing (22) through a bearing; and the outer end of the output shaft (28) extends into the housing of the corresponding wheel hub assembly (30).

6. A dual-drive wet electric axle with a split housing brake device according to claim 5, characterized in that: A transmission gear (281) is installed in the middle of the output shaft (28), the corresponding inner friction plate (26) and the outer friction plate (27) are inserted into the transmission gear (281), and the protrusion formed on the inner wall of the corresponding outer friction plate (27) is inserted into the tooth groove of the corresponding transmission gear (281).

7. The dual-drive wet electric axle with a split housing brake device according to claim 5, characterized in that: A spline is formed on the outer wall of the end of the output shaft of the motor (10), and a spline hole is formed in the middle of the inner end of the output shaft (28). The end of the output shaft of the motor (10) is inserted into the corresponding spline hole, and the spline is inserted into the spline groove on the inner wall of the corresponding spline hole and matches with each other.

8. The dual-drive wet electric axle with a split housing brake device according to claim 5, characterized in that: An annular extension portion (239) extending radially inward is formed on the inner side wall of the inner end of the service brake piston (23), and a plurality of through holes are formed on the annular extension portion (239). The rods of a plurality of fixing bolts are inserted into the corresponding through holes. The threaded connection portion formed at the end of the rod of the fixing bolt is threadedly connected to the middle portion of the outer end of the service brake housing (21). A compression spring (9) is inserted into the rod of the fixing bolt, one end of which is applied to the rotating portion of the fixing bolt, and the other end of the compression spring is applied to the outer end surface of the annular extension portion (239).

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