Wheel-side running and parking integrated wet brake mechanism

Abstract

The invention discloses a wheel-side running and parking integrated wet-type braking mechanism which comprises a half shaft and a wheel-side speed reduction assembly arranged at the outer end of the half shaft, a sleeve is arranged outside the half shaft in a sleeving mode, a wheel core is rotationally arranged outside the sleeve in a sleeving mode, and a wet-type braking mechanism is arranged between the interior of the wheel-side speed reduction assembly and the wheel core. The wet brake mechanism comprises a spline connecting sleeve fixedly arranged on the sleeve in a sleeving mode, a gear ring abutting against one side of the spline connecting sleeve, a brake pad fixedly arranged on the spline connecting sleeve in a sleeving mode, friction plates located on the two sides of the brake pad, a service brake piston arranged corresponding to the friction plates and a brake cylinder fixedly arranged on the gear ring. And the parking brake piston is sleeved outside the brake cylinder body. The running and parking integrated wet brake mechanism is arranged between the wheel core and the wheel side speed reduction assembly, and the running brake oil inlet pipeline and the parking oil inlet pipeline are arranged on the sleeve, so that the space is reasonably utilized, the overall structure is compact, and the running brake and parking effects can be achieved in the narrow wheel side space.

Description

Technical Field

[0001] This invention belongs to the field of wheel-side braking technology for engineering machinery, and specifically relates to a wheel-side integrated wet braking mechanism for driving and parking. Background Technology

[0002] Currently, the domestic market for construction machinery axle products is still dominated by dry-type brake drive axles. Furthermore, dry-type drive axles use external dry brakes, which makes them highly susceptible to environmental factors such as humidity, freezing, and dust, resulting in unstable braking performance and a short service life. In contrast, wet brakes are built-in, typically located within the axle, and are largely unaffected by environmental factors. They offer a long service life and reliable braking safety, and are widely used in existing construction machinery. Currently, technologies are also emerging that place wet brakes at the wheel well.

[0003] For example, Chinese Patent Publication No. CN222933741U discloses a wet brake wheel-side reduction assembly and a new energy transmission device. The wet brake wheel-side reduction assembly includes a half-shaft, a support shaft, a hub, a wheel-side reducer housing, a sun gear, a planetary carrier, planetary gears, and a braking mechanism. The half-shaft is mounted on the support shaft, and the sun gear is connected to the half-shaft. The hub and the wheel-side reducer housing are rotatably fitted to the support shaft. An internal gear ring is provided on the wheel-side reduction housing. The planetary carrier is mounted on the support shaft, and the planetary gears are mounted on the planetary carrier, meshing with both the sun gear and the internal gear ring. The braking mechanism includes a brake cylinder, a service brake piston, and a friction pad assembly. The brake cylinder is sleeved on the support shaft. The service brake piston is sleeved on the brake cylinder and slidably fitted with the brake cylinder axially on the support shaft. The friction pad assembly is located between the service brake piston and the hub. By designing the internal gear ring and the brake cylinder independently, the structure is simplified, processing costs are reduced, stress is simplified, and operational stability is improved.

[0004] Although the aforementioned patent incorporates a wet brake within the wheel-side reduction assembly to achieve a safe and reliable braking effect, it still suffers from the following drawbacks: its built-in wet brake structure is simple, only providing service braking and failing to achieve automatic parking braking. Furthermore, due to the limited internal space of the wheel-side reduction assembly, finding a wet braking mechanism that integrates service and parking braking within the wheel-side reduction assembly is a pressing challenge that needs to be overcome.

[0005] In view of this, the applicant conducted in-depth research on the above-mentioned issues, which led to the occurrence of this case. Summary of the Invention

[0006] The purpose of this invention is to provide a compact and reasonable wheel-side integrated wet braking mechanism.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A wheel-side integrated wet braking mechanism includes a half-shaft and a wheel-side reduction assembly disposed at the outer end of the half-shaft. A sleeve is fitted over the half-shaft, and a wheel core is rotatably fitted over the sleeve. The outer side of the wheel-side reduction assembly is fixedly connected to the outer side of the wheel core. A wet braking mechanism is disposed between the inner side of the wheel-side reduction assembly and the wheel core. The wet braking mechanism includes a spline connecting sleeve fixed to the sleeve, a gear ring abutting against one side of the spline connecting sleeve, a brake pad fixed to the spline connecting sleeve, friction pads slidably disposed on both sides of the brake pad, a service brake piston corresponding to the friction pads for pressing against the friction pads, a brake cylinder fixed to the gear ring, and a parking brake piston fitted outside the brake cylinder for pressing against the friction pads. The side of the gear ring closest to the spline connecting sleeve is fixed to the sleeve. Above, a service brake elastic element for pressing against the service brake piston is provided between the spline connecting sleeve and the service brake piston; a parking brake elastic element for pressing against the parking brake piston is provided between the gear ring and the parking brake piston; there is a gap between the friction pad and the brake pad; there is a service brake filling space between the service brake piston and the brake cylinder; there is a parking brake filling space between the parking brake piston and the brake cylinder; a service brake inlet channel is provided on the gear ring corresponding to the service brake filling space; parking brake inlet channels are provided on both the gear ring and the brake cylinder corresponding to the parking brake filling space; a service brake inlet pipe is provided on the sleeve corresponding to the service brake inlet channel; and a parking brake inlet pipe is provided on the sleeve corresponding to the parking brake inlet channel.

[0008] Furthermore, the gear ring has a hollow structure and includes an integrally formed fixing part, connecting part, and mounting part. The spline connecting sleeve is located near the wheel core. The fixing part is fitted onto the outside of the sleeve and abuts against the spline connecting sleeve on the side away from the wheel core. The parking brake oil inlet channel and the service brake oil inlet channel are both opened on the fixing part. The brake cylinder is fixedly connected to the connecting part. The parking brake piston is located at the position corresponding to the mounting part. The mounting part has a first mounting groove for mounting the parking brake elastic element on the side near the inner core.

[0009] Furthermore, the sleeve has an oil inlet and an exhaust port for the service brake oil inlet pipe on the periphery of the end away from the wheel-side reduction assembly, and the sleeve also has an oil inlet and an exhaust port for the parking oil inlet pipe on the periphery of the end away from the wheel-side reduction assembly.

[0010] Furthermore, a sealing sleeve is provided between the inner side of the fixing part and the sleeve, and the sealing sleeve has through holes at the positions corresponding to the parking brake oil inlet channel and the service brake oil inlet channel.

[0011] Furthermore, a fixing nut for pressing against the gear ring is provided on the outer side of the sleeve near the outer end of the half shaft. The fixing nut corresponds to the position of the fixing part, and the sealing sleeve is located between the gear ring and the fixing nut.

[0012] Furthermore, the parking brake oil inlet channel on the fixed part is arranged vertically, while the parking brake oil inlet channel on the brake cylinder is arranged obliquely.

[0013] Furthermore, the spline connecting sleeve has a second mounting groove on the side near the service brake piston for mounting the service brake elastic element.

[0014] Furthermore, sealing rings are provided between the service brake piston and the gear ring, between the service brake piston and the brake cylinder, and between the parking brake piston and the brake cylinder.

[0015] Furthermore, the outer end of the half-shaft has a sun gear, and the wheel-side reduction assembly includes an outer planetary carrier housing, an inner planetary gear, and a built-in part for mounting the planetary gear. The planetary gear meshes with the circumference of the sun gear, and the planetary carrier housing is fixedly connected to the outside of the wheel core.

[0016] Furthermore, it also includes an axle housing, with one end of the sleeve away from the wheel-side reduction assembly fixed to the axle housing.

[0017] By adopting the aforementioned design scheme, the beneficial effects of the present invention are: This invention features a wet braking mechanism that integrates driving and parking functions between the wheel hub and the wheel-side reduction assembly. Furthermore, it incorporates driving brake and parking brake oil inlet pipes on the sleeve, making efficient use of space. The overall structure is compact, enabling driving brake and parking functions to be achieved in the already limited wheel-side space.

[0018] Furthermore, the gear ring has a hollow structure and includes an integrally set fixing part, connecting part and mounting part. With this structure, the gear ring can mesh with the planetary gear and form a wet braking mechanism together with the service brake piston, parking brake piston and brake cylinder, making the overall structure more compact and applicable.

[0019] Furthermore, the installation of a sealing sleeve can enhance the sealing effect of the parking brake oil inlet channel and the service brake oil inlet channel, preventing hydraulic oil leakage. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural schematic diagram of the wet braking mechanism of the present invention.

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0022] Figure 3 This is a cross-sectional structural schematic diagram of the gear ring, service brake piston, brake cylinder, and parking brake piston in the wet braking mechanism of the present invention.

[0023] Figure 4 This is a cross-sectional structural schematic diagram of the sleeve in the wet braking mechanism of the present invention, showing the service brake oil inlet pipe and the parking brake oil inlet pipe respectively.

[0024] In the picture: 1-Sleeve; 10-Half-shaft; 11-Service brake oil inlet pipe; 12-Parking brake oil inlet pipe; 13-Sealing sleeve; 14-Fixing nut; 101-Wheel core; 2-Spline connecting sleeve; 20-Wheel-side reduction assembly; 21-Service brake elastic element; 201 - Planetary carrier housing; 202 - Internal components; 3-Gear ring; 30-Axle housing; 31-Service brake oil inlet passage; 32-Parking brake oil inlet passage; 33-Fixing part; 34-Connecting part; 35-Installation Section; 4-Brake pads; 5-Friction pads; 6-Service brake piston; 61-Service brake fluid filling space; 7-Brake cylinder body; 8-Parking brake piston; 81 - Parking brake fluid filling space; 82 - Parking brake elastic element; 9-Sealing ring. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figures 1 to 4As shown, a wheel-side integrated wet braking mechanism includes a half-shaft 10 and a wheel-side reduction assembly 20 disposed at the outer end of the half-shaft 10. A sleeve 1 is fitted over the half-shaft 10, with a gap between the half-shaft 10 and the sleeve 1. A wheel core 101 is rotatably fitted over the sleeve 1, and the wheel core 101 is used to mount the wheel-side reduction assembly 20. It should be noted that the wet braking mechanism of this invention is mounted on a conventional axle housing 30. The end of the half-shaft 10 away from the wheel-side reduction assembly 20 is connected inside the axle housing 30. The sleeve 1 is fixedly connected to the axle housing 30 by conventional bolts. The wheel core 101 is located away from the axle housing. One side of the axle housing 30 is fixedly connected to the outside of the wheel-side reduction assembly 20. The rotating connection structure between the wheel core 101 and the sleeve 1 is a conventional structure in the art, such as a bearing rotating connection. The outer end of the half shaft 10 has a sun gear. The wheel-side reduction assembly 20 can adopt a conventional wheel-side reduction assembly structure in the art. Specifically, the wheel-side reduction assembly 20 includes an outer planetary carrier housing 201, an inner planetary gear, and an inner part 202 for mounting the planetary gear. The planetary gear meshes with the circumference of the sun gear. The planetary carrier housing 201 is fixedly connected to the side of the wheel core 101 away from the axle housing 30.

[0027] The improvement of this invention lies in the fact that a wet braking mechanism integrating travel and parking is provided between the interior of the wheel-side reduction assembly 20 and the wheel core 101. The wet braking mechanism includes a spline connecting sleeve 2 fixed on the sleeve 1, a gear ring 3 abutting against one side of the spline connecting sleeve 2, a brake pad 4 fixed on the spline connecting sleeve 2, friction pads 5 slidably disposed on both sides of the brake pad 4, a travel brake piston 6 disposed corresponding to the friction pad 5 for pressing against the friction pad 5, a brake cylinder 7 fixed on the gear ring 3, and a parking brake piston 8 disposed outside the brake cylinder 7 for pressing against the friction pad 5. Specifically, the side of the gear ring 3 closest to the spline connecting sleeve 2 is fitted on the sleeve 1, and the outer side of the brake pad 4 engages with the inner side of the planetary carrier housing 201, ensuring that the brake pad 4 can rotate together with the planetary carrier housing 201. It should be noted that the connection method between the gear ring 3 and the sleeve 1, the connection method between the brake pad 4 and the spline connecting sleeve 2, and the connection method between the brake pad 4 and the inner side of the planetary carrier housing 201 are all important considerations. The connection method, as well as the connection method between the spline connecting sleeve 2 and the sleeve 1, can adopt conventional methods in the field. For example, a spline meshing connection can be used. The friction plate 5 is movably disposed in the planetary carrier housing 201 and located on both sides of the brake pad 4. There is a gap between the friction plate 5 and the brake pad 4. There is a service brake filling space 61 between the service brake piston 6 and the brake cylinder 7. When braking, the hydraulic oil enters the service brake filling space 61 and squeezes the service brake piston 6 towards the friction plate 5, pressing the brake pad 4 so that the planetary carrier housing 201 stops rotating. When the planetary carrier housing 201 stops rotating, it drives the entire wheel-side reduction assembly 20 and the half shaft 10 to stop rotating, thereby achieving the braking effect of the service brake. Correspondingly, a service brake elastic element 21 is provided between the spline connecting sleeve 2 and the service brake piston 6. The service brake elastic element 21 is used to push the service brake piston 6 back to its original position after the hydraulic oil leaves the service brake filling space 61, thereby releasing the braking effect.

[0028] There is a parking brake filling space 81 between the parking brake piston 8 and the brake cylinder 7. A parking brake elastic element 82 is provided between the gear ring 3 and the parking brake piston 8 to press against the parking brake piston 8. During normal driving, the engine pressurizes the oil circuit of the parking brake filling space 81 when it is running, automatically and continuously inputting hydraulic oil into the parking brake filling space 81, so that the parking brake filling space 81 is always full of hydraulic oil. The hydraulic oil in the parking brake filling space 81 overcomes the elastic force of the parking brake elastic element 82 and squeezes the parking brake piston 8 away from the friction pad 5. When the vehicle stops, the oil filling pressure of the engine on the parking brake filling space 81 is released, the hydraulic oil in the parking brake filling space 81 flows back, and the parking brake elastic element 82 squeezes the parking brake piston 8 towards the friction pad 5, pressing the brake pad 4 and stopping the planetary carrier housing 201 from rotating. The planetary carrier housing 201 stops rotating, which drives the entire wheel-side reduction assembly 20 and half shaft 10 to stop rotating, thereby achieving the parking brake effect.

[0029] Accordingly, in this invention, the gear ring 3 is provided with a service brake oil inlet channel 31 at the position corresponding to the service brake oil filling space 61, and the sleeve 1 is provided with a service brake oil inlet pipe 11 at the position corresponding to the service brake oil inlet channel 31. The sleeve 1 has an oil inlet and an exhaust port of the service brake oil inlet pipe 11 on its periphery at the end away from the wheel-side reduction assembly 20. When the service brake is applied, hydraulic oil enters the service brake oil inlet pipe 11 from the oil inlet and then enters the service brake oil filling space 61 through the service brake oil inlet channel 31. The gear ring 3 and the brake cylinder 7 are both provided with parking brake oil inlet channels 32 at the positions corresponding to the parking brake oil filling space 81, and the sleeve 1 is provided with a parking brake oil inlet channel 32 at the position corresponding to the parking brake oil inlet channel 32. The oil inlet pipe 12, the service brake oil inlet pipe 11, and the parking brake oil inlet pipe 12 are independently set. Correspondingly, the circumference of the end of the sleeve 1 away from the wheel-side reduction assembly 20 is provided with the oil inlet and exhaust port of the parking brake oil inlet pipe 12. When driving, the hydraulic oil enters the parking brake oil inlet pipe 12 from the oil inlet and then enters the parking brake filling space 81 through the parking brake oil inlet channel 32. The present invention sets up a wet braking mechanism integrating driving and parking between the wheel core 101 and the wheel-side reduction assembly 20, and opens the service brake oil inlet pipe 11 and the parking brake oil inlet pipe 12 on the sleeve 1. It makes reasonable use of space and the overall structure is compact, so that the already narrow wheel-side space can realize the driving brake and parking brake effects.

[0030] Preferably, the gear ring 3 has a hollow structure and includes an integrally formed fixing part 33, connecting part 34, and mounting part 35. The spline connecting sleeve 2 is located near the wheel core 101. The fixing part 33 is fitted onto the outside of the sleeve 1 and abuts against the side of the spline connecting sleeve 2 away from the wheel core 101. Correspondingly, the parking brake oil inlet channel 32 and the service brake oil inlet channel 31 are both opened on the fixing part 33. The brake cylinder 7 is located at the position corresponding to the connecting part 34 and is fixedly connected to the connecting part 34, for example, by conventional bolt fasteners. There is a space between the inner part 202 of the wheel-side reduction assembly 20 and the inner side of the planetary carrier housing 201 for the mounting part 35 to extend into. Correspondingly, the mounting part 35 meshes with the inner side wall of the planetary gear. The parking brake piston 8 is located at the position corresponding to the mounting part 35. The mounting part 35 is provided with a first mounting groove for mounting the parking brake elastic element 82 on the side near the wheel core 101. One end of the parking brake elastic element 82 abuts against the first mounting groove, and the other end abuts against the parking brake piston 8. The gear ring 3 adopts this structure, which can mesh with the planetary gear on the one hand, and form a wet braking mechanism together with the service brake piston 6, the parking brake piston 8 and the brake cylinder 7 on the other hand, making the overall structure more compact and applicable. It should be noted that in actual use, multiple parking brake elastic elements 82 need to be arranged along the circumference of the mounting part 35 to achieve sufficient abutting elastic force. The number of parking brake elastic elements 82 can be set according to actual needs. This embodiment does not limit it. The parking brake elastic element 82 of the present invention can be a conventional spring or disc spring in the art.

[0031] Preferably, a sealing sleeve 13 is provided between the inner side of the fixing part 33 and the sleeve 1. The sealing sleeve 13 is fitted on the sleeve 1 at the positions corresponding to the parking brake oil inlet channel 32 and the service brake oil inlet channel 31. Correspondingly, the sealing sleeve 13 is provided with through holes for hydraulic oil to pass through at the positions corresponding to the parking brake oil inlet channel 32 and the service brake oil inlet channel 31. This arrangement can enhance the sealing effect of the parking brake oil inlet channel 32 and the service brake oil inlet channel 31 and prevent hydraulic oil leakage. Several sealing rings are provided between the sealing sleeve 13 and the toothed ring 3, and between the sealing sleeve 13 and the sleeve 1.

[0032] Preferably, a fixing nut 14 for pressing against the gear ring 3 is provided on the outer side of the sleeve 1 near the outer end of the half shaft 10. The fixing nut 14 corresponds to the position of the fixing part 33. The sealing sleeve 13 is located between the gear ring 3 and the fixing nut 14. Preferably, in this embodiment, the fixing nut 14 is provided with an internal thread corresponding to the side wall of the half shaft 10, and the outer side of the sleeve 1 near the outer end of the half shaft 10 is provided with an external thread that mates with the internal thread. By tightening the fixing nut 14 onto the sleeve 1, the sealing sleeve 13 and the gear ring 3 can be pressed and fixed.

[0033] Preferably, the parking brake oil inlet channel 32 on the fixing part 33 is arranged vertically, and the parking brake oil inlet channel 32 on the brake cylinder body 7 is arranged obliquely, so as to facilitate the hydraulic oil to enter the parking brake oil filling space 81.

[0034] Preferably, the spline connecting sleeve 2 has a second mounting groove for mounting the service brake elastic element 21 on the side near the service brake piston 6. One end of the service brake elastic element 21 abuts against the second mounting groove, and the other end abuts against the service brake piston 6. Accordingly, in actual use, multiple service brake elastic elements 21 need to be arranged along the circumference of the spline connecting sleeve 2 to achieve sufficient abutting elastic force. The number of service brake elastic elements 21 can be set according to actual needs. This embodiment does not limit this. The service brake elastic element 21 of the present invention can be a conventional spring or disc spring in the art.

[0035] Preferably, sealing rings 9 are provided between the service brake piston 6 and the gear ring 3, between the service brake piston 6 and the brake cylinder 7, and between the parking brake piston 8 and the brake cylinder 7, to further enhance the sealing between the various components. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wheel-side parking and integrated wet brake mechanism, comprising a half shaft and a wheel-side reduction assembly arranged at an outer end of the half shaft, characterized in that, The half shaft sleeve is provided with a sleeve, the sleeve is provided with a wheel core outside the rotating sleeve, the outside of the wheel edge reduction assembly is fixedly connected with the outside of the wheel core, the inside of the wheel edge reduction assembly and the wheel core are provided with a wet brake mechanism, the wet brake mechanism comprises a spline connection sleeve fixed on the sleeve, a gear ring abutting on one side of the spline connection sleeve, a brake pad fixed on the spline connection sleeve, a friction plate slidably arranged on both sides of the brake pad, a driving brake piston corresponding to the friction plate for pressing the friction plate, a brake cylinder body fixed on the gear ring, and a parking brake piston outside the brake cylinder body for pressing the friction plate, one side of the gear ring close to the spline connection sleeve is fixed on the sleeve, the spline connection sleeve and the driving brake piston are provided with a driving brake elastic element for pressing the driving brake piston, the gear ring and the parking brake piston are provided with a parking brake elastic element for pressing the parking brake piston, the friction plate and the brake pad have a gap, the driving brake piston and the brake cylinder body have a driving brake oil injection space, the parking brake piston and the brake cylinder body have a parking brake oil injection space, the gear ring is provided with a driving brake oil inlet channel corresponding to the position of the driving brake oil injection space, the gear ring and the brake cylinder body are provided with a parking brake oil inlet channel corresponding to the position of the parking brake oil injection space, the sleeve is provided with a driving brake oil inlet pipe corresponding to the position of the driving brake oil inlet channel, and the sleeve is provided with a parking brake oil inlet pipe corresponding to the position of the parking brake oil inlet channel.

2. The wheel-side integrated wet brake mechanism according to claim 1, characterized by, The gear ring is in a hollow structure, the gear ring comprises a fixed part, a connecting part and a mounting part arranged integrally, the spline connection sleeve is arranged close to the wheel core, the fixed part is fixed on the outside of the sleeve and abuts on one side of the spline connection sleeve away from the wheel core, the parking brake oil inlet channel and the driving brake oil inlet channel are arranged on the fixed part, the brake cylinder body is fixedly connected with the connecting part, the parking brake piston is arranged corresponding to the position of the mounting part, and the mounting part is provided with a first mounting groove for mounting the parking brake elastic element on one side close to the inner core.

3. The wheel-side integrated wet brake mechanism according to claim 1, characterized by, The periphery of one end of the sleeve away from the wheel edge reduction assembly is provided with an oil inlet and an exhaust port corresponding to the driving brake oil inlet channel, and the periphery of one end of the sleeve away from the wheel edge reduction assembly is provided with an oil inlet and an exhaust port corresponding to the parking brake oil inlet channel.

4. The wheel-side integrated wet brake mechanism according to claim 2, characterized by, The inside of the fixed part and the sleeve are further provided with a sealing sleeve, and the sealing sleeve is provided with a through hole corresponding to the positions of the parking brake oil inlet channel and the driving brake oil inlet channel.

5. The wheel-side integrated wet brake mechanism according to claim 4, wherein The outside of the sleeve close to the outer end of the half shaft is further provided with a fixed nut for pressing the gear ring, the fixed nut corresponds to the position of the fixed part, and the sealing sleeve is located between the gear ring and the fixed nut.

6. The wheel-side integrated wet brake mechanism according to claim 2, wherein The parking brake oil inlet channel on the fixed part is vertically arranged, and the parking brake oil inlet channel on the brake cylinder body is obliquely arranged.

7. The wheel-side integrated wet brake mechanism according to claim 1, wherein The spline connection sleeve is provided with a second installation groove for installing the service brake elastic element on the side close to the service brake piston.

8. The wheel-side integrated wet brake mechanism according to claim 1, characterized by, Sealing rings are arranged between the service brake piston and the gear ring, between the service brake piston and the brake cylinder body, and between the parking brake piston and the brake cylinder body.

9. The wheel-side integrated wet brake mechanism according to claim 1, wherein The outer end of the half shaft is provided with a sun gear, the wheel edge reduction assembly comprises an outer planetary carrier shell and an inner planetary gear, and an inner part for mounting the planetary gear, the planetary gear is engaged with the circumference of the sun gear, and the planetary carrier shell is fixedly connected with the outer part of the wheel core.

10. The wheel-side integrated wet brake mechanism according to claim 1, characterized by, The sleeve is fixedly arranged on a bridge shell at the end away from the wheel edge reduction assembly.

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