Brake axle with two-in-one brake for construction machines

Abstract

This utility model discloses a brake wheel axle with a two-in-one brake for engineering machinery, including a wheel support axle and a wheel hub. A parking brake is located at the right end of the wheel support axle, comprising a parking brake cylinder and a parking brake piston. A service brake is located at the left end of the wheel hub, comprising a service brake cylinder and a service brake piston. The left end of the parking brake cylinder is detachably and fixedly connected to a first flange, and the right end is fixedly connected to the service brake cylinder. The service brake cylinder is connected to a second flange via a first floating sealing ring assembly. A friction pad assembly is provided between the parking brake piston and the service brake piston, and a disc spring is installed inside the parking brake piston. This utility model frees up a significant amount of space by splitting the existing intermediate load-bearing axle into two separate brake wheel axles, facilitating the arrangement of structural and functional components. Simultaneously, by placing a parking brake and a service brake between the wheel support axle and the wheel hub, it solves the parking brake problem and improves vehicle safety performance.

Description

Technical Field

[0001] This utility model relates to the field of wheel-side braking technology for engineering machinery, and in particular to a brake wheel axle with a two-in-one brake for small container / cable car. Background Technology

[0002] Currently, existing small container / cable car systems use wet multi-disc brakes, where the friction pads are connected to the intermediate axle housing. This structure is complex, occupies a large space, and is inconvenient for arranging the overall structural and functional components. Furthermore, existing wet multi-disc brakes only provide a service brake and lack a parking brake, increasing the burden on the service brake. During prolonged parking, relying on the service brake to prevent vehicle movement accelerates wear, increases maintenance costs, and may lead to overheating of the service brake system, affecting braking performance. In emergency situations, such as service brake failure, without a parking brake, the driver cannot effectively stop the vehicle, increasing the risk of accidents. Utility Model Content

[0003] To address the issues of existing wet multi-disc brakes for small container / cable car vehicles occupying too much space, making it inconvenient to arrange structural and functional components, and lacking a parking brake, this invention provides a brake wheel axle with a two-in-one brake for engineering machinery. By splitting the existing intermediate load-bearing axle into two separate brake wheel axles and eliminating the intermediate axle housing connection, a significant amount of space is freed up, facilitating the arrangement of structural and functional components. Simultaneously, by installing both a parking brake and a driving brake between the wheel axle and the wheel hub, the parking brake problem is solved, improving vehicle safety performance, reducing the risk of accidents in emergency situations, lessening the burden on the driving brake, and extending its service life.

[0004] To achieve the above objectives, this utility model provides a brake wheel axle with a two-in-one brake for engineering machinery, including a wheel support axle and a wheel hub. The left end of the wheel support axle has a first flange for connection to the frame, and the right end of the wheel hub has a second flange for connection to the wheel rim. The wheel hub is fitted onto the outer side of the right end of the wheel support axle, away from the first flange. A first tapered roller bearing and a second tapered roller bearing are respectively provided at the left and right ends between the inner surface of the wheel hub and the outer surface of the wheel support axle. A parking brake is fitted onto the outer surface of the right end of the wheel support axle near the first flange, including a parking brake cylinder and a parking brake piston. A service brake is fitted onto the outer surface of the left end of the wheel hub, including a service brake cylinder and a service brake piston. The left side of the parking brake cylinder is detachably and fixedly connected to the right end of the first flange, and the right side is detachably and fixedly connected to the left side of the service brake cylinder. The right side of the body and the left end face of the second flange are sealed and connected by the first floating sealing ring assembly. The left end of the wheel hub is provided with an integrally formed external gear ring. The right end hole of the parking brake cylinder is provided with an internal gear ring. A friction plate assembly is sleeved between the parking brake piston and the service brake piston. The friction plate assembly includes multiple moving friction plates and multiple stationary friction plates that are staggered with the moving friction plates. The inner side wall of the moving friction plate is provided with internal teeth, and the outer side wall of the stationary friction plate is provided with external teeth. The internal teeth of the moving friction plate mesh with the external gear ring of the wheel hub, and the external teeth of the stationary friction plate mesh with the internal gear ring of the parking brake cylinder. The parking brake and the service brake share this friction plate assembly. The parking brake piston is provided with a first through hole. The left end of the first through hole is provided with a first layer hole. A disc spring is provided in the first layer hole. The wheel support shaft is provided with a shoulder at the corresponding position of the disc spring. The right end of the disc spring abuts against the bottom surface of the first layer hole, and the left end face abuts against the shoulder.

[0005] Starting from the right side of the second tapered bearing, a locking washer, a locking nut, and a floating seal seat are sequentially fitted onto the outer circular surface of the right end of the wheel support shaft. The floating seal seat and the locking nut are detachably and securely connected by a first O-ring seal. The right end face of the wheel hub and the left end face of the floating seal seat are sealed together by a second floating sealing ring assembly.

[0006] Furthermore, the parking brake cylinder body is provided with a second through hole, the left end of the second through hole is provided with a second layer hole, and the right end is provided with a third layer hole. The internal gear ring is provided on the inner wall of the third layer hole. The outer circular surface of the left end of the parking brake piston is provided with an outwardly extending first flange. The outer side of the first flange forms a movable sealing connection with the inner side of the second layer hole. The outer side of the right end of the parking brake piston forms a movable sealing connection with the inner side of the second through hole. A sealed parking brake hydraulic cavity is formed between the right end face of the first flange, the inner circular surface and bottom surface of the second layer hole, and the outer side of the right end of the parking brake piston. The outer circular surface of the parking brake cylinder body is provided with a radial parking brake release oil inlet at a position corresponding to the parking brake hydraulic cavity. The axis of the parking brake release oil inlet is flush with the bottom surface of the second layer hole, so that the parking brake release oil inlet is connected to the parking brake hydraulic cavity.

[0007] Furthermore, the service brake cylinder body is provided with a third through hole, and the left end of the third through hole is provided with a fourth layer hole. The inner diameter of the fourth layer hole is the same as the inner diameter of the second through hole. The outer side of the left end of the service brake piston is provided with an outwardly extending second flange. The outer side of the second flange forms a movable sealing connection with the inner side of the fourth layer hole. The outer circular surface of the right side of the service brake piston forms a movable sealing connection with the inner side of the third through hole. A sealed service brake hydraulic cavity is formed between the right end face of the second flange, the inner circular surface and bottom surface of the fourth layer hole, and the outer side of the right end of the service brake piston. The outer circular surface of the service brake cylinder body is provided with a radial service brake oil inlet at a position corresponding to the service brake hydraulic cavity. The axis of the service brake oil inlet is flush with the bottom surface of the fourth layer hole, so that the service brake oil inlet is connected to the service brake hydraulic cavity.

[0008] Furthermore, the parking brake cylinder has a radial brake lubricating oil inlet on the right end of its outer circular surface. The brake lubricating oil inlet is connected to the third layer hole, and the axis of the brake lubricating oil inlet is flush with the right end face of the third layer hole. The parking brake piston has a radial oil hole on its right outer circular surface, which is connected to the third layer hole and the first through hole.

[0009] Furthermore, a first annular sealing groove is provided on the outer circular surface of the first flange and the outer circular surface of the right side of the parking brake piston. A Y-shaped sealing ring is provided in the first annular sealing groove. The left and right connecting surfaces of the parking brake piston and the parking brake cylinder are sealed by two Y-shaped sealing rings.

[0010] Furthermore, a second annular sealing groove is provided on the outer circular surface of the second flange and the outer circular surface of the right side of the service brake piston. A combined sealing ring is provided in the second annular sealing groove. The connection surfaces of the service brake piston and the left and right sides of the service brake cylinder are sealed by two combined sealing rings.

[0011] Both the outer circular surface of the second flange and the outer circular surface of the right side of the service brake piston are provided with annular grooves, and a guide ring is provided in the annular grooves.

[0012] Furthermore, the parking brake cylinder body is provided with a first inner stop on the left side, and the first flange is provided with a first outer stop on the right side that mates with the first inner stop. A first sealing groove is provided at the root of the first outer stop on the right side of the first flange, and a second O-ring is provided in the first sealing groove. The parking brake cylinder body and the first flange are connected to each other through the first inner stop and the first outer stop, and are sealed by the first O-ring.

[0013] The parking brake cylinder body has a fifth layer hole on the right side of the third layer hole, and the service brake cylinder body has a second outer stop on the left side surface. The service brake cylinder body has a second sealing groove at the root of the second outer stop on the left side surface. The second sealing groove has a third O-ring seal. The parking brake cylinder body and the service brake cylinder body are connected to the fifth layer hole through the second outer stop and sealed by the second O-ring seal.

[0014] The right side of the service brake cylinder body and the left side of the second flange are both provided with annular grooves on the end face that cooperate with the first floating sealing ring assembly, and the first floating sealing ring assembly is located in the annular groove on the end face.

[0015] Furthermore, the wheel support shaft is provided with an exhaust channel, which includes a first exhaust hole, a second exhaust hole, and a third exhaust hole. The first exhaust hole is located at the center of the wheel support shaft and is coaxial with the wheel support shaft. The left end of the first exhaust hole is provided with a countersunk threaded hole, and an internal hexagon screw is connected to the countersunk threaded hole. A copper washer is provided at the connection between the internal hexagon screw and the bottom surface of the countersunk hole. The upper end face of the first flange is set as a tangent plane. The second exhaust hole is a radial hole located on the tangent plane and communicates with the first exhaust hole. The third exhaust hole is a radial hole located on the outer circular surface of the right end of the wheel support shaft, between the first tapered roller bearing and the second tapered roller bearing, and communicates with the first exhaust hole.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: by splitting the existing intermediate load-bearing bridge into two separate brake wheel axles and removing the intermediate bridge housing connection part, a large amount of space is freed up, which facilitates the arrangement of the overall structural and functional components; at the same time, by setting a parking brake and a service brake between the wheel axle and the wheel hub, the parking brake problem is solved, the vehicle safety performance is improved, the risk of accidents in emergency situations is reduced, the burden on the service brake is reduced, and the service life of the service brake is extended.

[0017] 1. The present invention provides a guide ring on the connection surface between the service brake piston and the service brake cylinder, which makes the linear movement of the service brake piston more stable, less prone to tilting, and improves the service braking efficiency.

[0018] 2. The service brake and parking brake of this utility model use the same friction pad assembly, which makes the structure more compact and saves costs;

[0019] 3. The parking brake piston and parking brake cylinder are sealed with a Y-type sealing ring, and the service brake piston and service brake cylinder are sealed with a combined sealing ring, which improves the pressure resistance and service life of the parking brake and service brake.

[0020] 4. The present invention adopts a floating sealing ring assembly for sealing between the service brake cylinder body and the wheel hub, and between the wheel hub and the floating seal seat. This can better address the problem of large coaxiality after the assembly of various components, effectively prevent lubricating oil leakage, and improve sealing performance. Attached Figure Description

[0021] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the left-side structure of an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of the upper end of the parking brake cylinder in an embodiment of the present invention.

[0024] Figure 4 This is a cross-sectional view of the upper end of the parking brake piston in an embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional view of the upper end of the service brake cylinder body according to an embodiment of the present utility model;

[0026] Figure 6 This is a cross-sectional view of the upper end of the service brake piston in an embodiment of this utility model.

[0027] In the diagram: 1. Wheel support shaft; 101. First flange; 102. Second vent; 103. First vent; 104. Third vent; 105. Cutting plane; 2. Parking brake; 201. Parking brake cylinder body; 2011. Second through hole; 2012. Second layer hole; 2013. First inner stop; 2014. Third layer hole; 2015. Internal gear ring; 2016. Fifth layer hole; 2017. Release parking brake. 2018. Oil inlet; 202. Lubricating oil inlet; 202. Parking brake piston; 2021. First through hole; 2022. First layer hole; 2023. First flange; 2024. First annular sealing groove; 2025. Oil inlet hole; 3. Friction pad assembly; 301. Dynamic friction pad; 302. Static friction pad; 4. Service brake; 401. Service brake cylinder body; 4011. Third through hole; 4012. Fourth layer hole; 40 13. Outer stop; 4014. Service brake oil inlet; 4015. End face sealing groove; 4016. Second sealing groove; 402. Service brake piston; 4021. Fourth through hole; 4022. Sixth layer hole; 4023. Second flange; 4024. Annular groove; 4025. Second annular sealing groove; 5. Wheel hub; 501. Second flange; 6. Disc spring; 7. First floating sealing ring assembly; 8. Floating seal. 9. Seat, 10. First O-ring seal, 11. Locking nut, 12. Second floating sealing ring assembly, 13. Locking washer, 14. First tapered roller bearing, 15. Guide ring, 16. Combined sealing ring, 17. Third O-ring seal, 18. Second tapered roller bearing, 19. Y-ring seal, 20. Plug, 21. Copper gasket, 22. Parking brake hydraulic chamber, 23. Service brake hydraulic chamber, 24. Second O-ring seal. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figures 1-6As shown, this embodiment of the utility model includes a wheel support shaft 1 and a wheel hub 5. The left end of the wheel support shaft 1 is provided with a first flange 101 for connection to the frame. The right end of the wheel hub 5 is provided with a second flange 501 for connection to the wheel rim. The wheel hub 5 is fitted onto the outer side of the right end of the wheel support shaft 1, away from the first flange 101. A first tapered roller bearing 13 and a second tapered roller bearing 17 are respectively provided at the left and right ends between the inner surface of the wheel hub 5 and the outer surface of the wheel support shaft 1. A wheel hub 5 is fitted onto the outer surface of the right end of the wheel support shaft 1 near the first flange 101. A parking brake 2 is provided, comprising a parking brake cylinder 201 and a parking brake piston 202. A service brake 4 is fitted onto the outer circumference of the left end of the wheel hub 5, comprising a service brake cylinder 401 and a service brake piston 402. The left side of the parking brake cylinder 401 is detachably and fixedly connected to the right end face of the first flange 101, and the right side is detachably and fixedly connected to the left side of the service brake cylinder 402. The right side of the service brake cylinder 402 is connected to the left end face of the second flange 501 via a first... A floating sealing ring assembly 7 provides a sealing connection. The left end of the wheel hub 5 has an integrally formed external gear ring. An internal gear ring 2015 is located inside the hole at the right end of the parking brake cylinder 201. A friction pad assembly 3 is fitted between the parking brake piston 202 and the service brake piston 402. The friction pad assembly 3 includes six moving friction pads 301 and seven stationary friction pads 302 that are interleaved with the moving friction pads 301. The inner sidewall of the moving friction pads 301 has internal teeth, and the outer sidewall of the stationary friction pads 302 has external teeth. The internal teeth of the moving friction pads are connected to the wheel hub 5. The external gear ring meshes with the static friction pad, and the external gear of the static friction pad meshes with the internal gear ring 2015 of the parking brake cylinder 201. The parking brake and the service brake share the friction pad assembly 3. The parking brake piston 202 is provided with a first through hole 2021. The left end of the first through hole 2021 is provided with a first layer hole 2022. The first layer hole 2022 is provided with a disc spring 6. The wheel support shaft 1 is provided with a shoulder at the corresponding position of the disc spring 6. The right end of the disc spring 6 abuts against the bottom surface of the first layer hole 2022, and the left end abuts against the shoulder.

[0030] Starting from the right side of the second tapered bearing 17, a locking washer 12, a locking nut 10, and a floating seal seat 8 are sequentially fitted on the outer circular surface of the right end of the wheel support shaft 1. The floating seal seat 8 and the locking nut 10 are detachably sealed and fixedly connected by the first O-ring seal 9. The right end face of the wheel hub 5 and the left end face of the floating seal seat 10 are sealed and connected by the second floating sealing ring assembly 11.

[0031] This utility model uses a disc spring 6, which can increase the parking brake torque and the pressure to release the parking brake, thereby ensuring reliable release of the parking brake, reducing vehicle wear, and improving driving safety.

[0032] Furthermore, the parking brake cylinder body 201 is provided with a second through hole 2011. The left end of the second through hole 2011 is provided with a second layer hole 2012, and the right end is provided with a third layer hole 2014. The internal gear ring 2015 is provided on the inner side wall of the third layer hole 2014. The outer circumference of the left end of the parking brake piston 202 is provided with an outwardly extending first flange 2023. The outer side of the first flange 2023 forms a movable sealing connection with the inner side of the second layer hole 2012. The outer side of the right end of the parking brake piston 202 is connected to the inner side of the second through hole 2011. A movable sealing connection is formed, and a sealed parking brake hydraulic cavity 21 is formed between the right end face of the first flange 2023, the inner circular surface and bottom surface of the second layer hole 2012, and the outer side of the right end of the parking brake piston 202. A radial parking brake release oil inlet 2017 is provided on the outer circular surface of the parking brake cylinder 201 at a position corresponding to the parking brake hydraulic cavity 21. The axis of the parking brake release oil inlet 2017 is flush with the bottom surface of the second layer hole 2012, so that the parking brake release oil inlet 2017 is connected to the parking brake hydraulic cavity 21.

[0033] When driving, the parking brake inlet 2017 continuously supplies oil to the parking brake hydraulic chamber 21, keeping the oil pressure in the parking brake hydraulic chamber 21 constant at the system's required pressure value. Under this constant oil pressure, the parking brake piston 202 moves to the left, releasing the friction pad assembly 3 and completely releasing the parking brake. When parking brake is needed after driving brake is applied, the parking brake inlet 2017 stops supplying oil, the oil pressure in the parking brake hydraulic chamber 21 drops, and the parking brake piston 202 moves linearly to the right under the rebound force of the disc spring 6, squeezing the friction pad assembly 3. The parking brake 2 generates braking torque, thus parking the entire vehicle.

[0034] Furthermore, the service brake cylinder 401 has a third through hole 4011, and a fourth layer hole 4012 is provided at the left end of the third through hole 4011. The inner diameter of the fourth layer hole 4012 is the same as the inner diameter of the second through hole 2011. The service brake piston 402 has a fourth through hole 4021, and a sixth layer hole 4022 is provided on the left side of the fourth through hole 4021. A second flange 4023 extending outward is provided on the outer surface of the left end of the service brake piston 402. The outer surface of the second flange 4023 forms a movable sealing connection with the inner surface of the fourth layer hole 4012. The outer circular surface on the right side forms a movable sealing connection with the inner surface of the third through hole 4011. The right end face of the second flange 4023, the inner circular surface and bottom surface of the fourth layer hole 4012, and the outer surface of the right end of the service brake piston 402 form a sealed service brake hydraulic cavity 22. A radial service brake oil inlet 4014 is provided on the outer circular surface of the service brake cylinder 402 at a position corresponding to the service brake hydraulic cavity 22. The axis of the service brake oil inlet 4014 is flush with the bottom surface of the fourth layer hole 4012, so that the service brake oil inlet 4014 is connected to the service brake hydraulic cavity 22.

[0035] When the vehicle brakes, hydraulic oil enters the service brake hydraulic chamber 22 from the service brake inlet 4014. The inlet pressure pushes the service brake piston 402 to move linearly to the left, squeezing the friction pad assembly 3. The service brake 4 generates braking torque, causing the vehicle to stop.

[0036] Furthermore, the parking brake cylinder body 201 has a radial brake lubricating oil inlet 2018 on the right end of its outer circular surface. The brake lubricating oil inlet 2018 is connected to the third layer hole 2014, and the axis of the brake lubricating oil inlet 2018 is flush with the right end face of the third layer hole 2014. The parking brake piston 202 has a radial oil hole 2025 on its right outer circular surface. The radial oil hole 2025 is connected to the third layer hole 2014 and the first through hole 2021.

[0037] Brake lubricating oil enters from the brake lubricating oil inlet 2018, passes through the third layer hole 2014 and the radial oil hole 2025, and flows into the inner cavity of the brake to lubricate various components in the inner cavity, such as the friction pad assembly 3, the outer gear ring of the hub 5, the first tapered roller bearing 13, the second tapered roller bearing 17, and the disc spring 6.

[0038] Furthermore, a first annular sealing groove 2024 is provided on the outer circular surface of the first flange 2023 and the outer circular surface of the right side of the parking brake piston 202. A Y-shaped sealing ring 18 is provided in the first annular sealing groove 2024. The left and right connecting surfaces of the parking brake piston 202 and the parking brake cylinder 201 are sealed by two Y-shaped sealing rings 18.

[0039] Furthermore, a second annular sealing groove 4025 is provided on the outer circular surface of the second flange 4023 and the outer circular surface of the right side of the service brake piston 402. A combined sealing ring 15 is provided in the second annular sealing groove 4025. The connection surfaces of the service brake piston 402 and the left and right sides of the service brake cylinder 401 are sealed by two combined sealing rings 15.

[0040] Both the outer circular surface of the second flange 4023 and the outer circular surface of the right side of the service brake piston 402 are provided with annular grooves 4024, and guide rings 14 are provided in the annular grooves 4024.

[0041] Furthermore, the parking brake cylinder body 201 has a first inner stop 2013 on its left side surface, and the first flange 101 has a first outer stop that mates with the first inner stop 2013 on its right side surface. The first flange 101 has a first sealing groove at the root of the first outer stop on its right side surface, and a second O-ring seal 23 is provided in the first sealing groove. The parking brake cylinder body 201 and the first flange 101 are connected to each other through the first inner stop 2013 and the first outer stop, and are sealed by the second O-ring seal 23.

[0042] The parking brake cylinder body 201 has a fifth layer hole 2016 on the right side of the third layer hole 2014. The service brake cylinder body 401 has a second outer stop 4013 on its left side surface. The service brake cylinder body 401 has a second sealing groove 4016 at the root of the second outer stop 4013 on its left side surface. The second sealing groove 4016 has a third O-ring seal 16. The parking brake cylinder body 201 and the service brake cylinder 401 are connected to the fifth layer hole 2016 through the second outer stop 4013 and sealed by the third O-ring seal 16.

[0043] The right side of the service brake cylinder body 401 and the left side of the second flange 501 are provided with an annular groove 4015 that cooperates with the first floating sealing ring assembly 7. The first floating sealing ring assembly 7 is located in the annular groove 4015.

[0044] Furthermore, the wheel support shaft 1 is provided with an exhaust channel, which includes a first exhaust hole 103, a second exhaust hole 102, and a third exhaust hole 104. The first exhaust hole 103 is located at the center of the wheel support shaft 1 and is coaxial with the wheel support shaft 1. The left end of the first exhaust hole 103 is provided with a countersunk threaded hole, and an internal hexagon screw 20 is connected to the internal thread of the countersunk threaded hole. A copper washer 19 is provided at the connection between the internal hexagon screw and the bottom surface of the countersunk hole. The upper end face of the first flange 101 is provided as a tangent plane 105. The second exhaust hole 102 is a radial hole located on the tangent plane 105 and communicates with the first exhaust hole 103. The third exhaust hole 104 is a radial hole located on the outer circular surface of the right end of the wheel support shaft 1, located between the first tapered roller bearing 13 and the second tapered roller bearing 17, and communicates with the first exhaust hole 103.

[0045] During operation, the lubricating oil inside the brake cavity will generate fumes due to the increased temperature of the working parts, and the exhaust passage is used to discharge these fumes.

[0046] Furthermore, the parking brake oil inlet 2017, the service brake oil inlet 4014, and the brake lubricant filler 2018 are all equipped with American standard pipe threads, which are used to connect to the corresponding oil pipes respectively; the upper end of the first vent hole 102 is equipped with an American standard pipe thread, which is used to connect to an external vent pipe.

[0047] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A brake wheel axle with a two-in-one brake for engineering machinery, comprising a wheel support axle and a wheel hub, wherein a first flange is provided at the left end of the wheel support axle for connection to a frame, and a second flange is provided at the right end of the wheel hub for connection to a wheel rim, the wheel hub being fitted onto the outer side of the right end of the wheel support axle, far from the first flange end, and a first tapered roller bearing and a second tapered roller bearing are respectively provided at the left and right ends between the inner circular surface of the wheel hub and the outer circular surface of the wheel support axle, characterized in that: A parking brake is fitted onto the outer surface of the right end of the wheel axle near the first flange. The parking brake includes a parking brake cylinder and a parking brake piston. A service brake is fitted onto the outer surface of the left end of the wheel hub. The service brake includes a service brake cylinder and a service brake piston. The left side of the parking brake cylinder is detachably and fixedly connected to the right end of the first flange, and the right side is detachably and fixedly connected to the left side of the service brake cylinder. The right side of the service brake cylinder is sealed to the left end of the second flange via a first floating sealing ring assembly. The left end of the wheel hub has an integrally formed external gear ring, and the right end of the parking brake cylinder has an internal gear ring. The parking brake piston and the service brake piston... A friction plate assembly is fitted between the plugs. The friction plate assembly includes multiple moving friction plates and multiple stationary friction plates that are interleaved with the moving friction plates. The inner sidewall of the moving friction plate is provided with internal teeth, and the outer sidewall of the stationary friction plate is provided with external teeth. The internal teeth of the moving friction plate mesh with the outer gear ring of the wheel hub, and the external teeth of the stationary friction plate mesh with the internal gear ring of the parking brake cylinder. The parking brake and the service brake share this friction plate assembly. The parking brake piston is provided with a first through hole, and the left end of the first through hole is provided with a first layer hole. A disc spring is provided in the first layer hole. The wheel support shaft is provided with a shoulder at the position corresponding to the disc spring. The right end of the disc spring abuts against the bottom surface of the first layer hole, and the left end abuts against the shoulder. Starting from the right side of the second tapered bearing, a locking washer, a locking nut, and a floating seal seat are sequentially fitted onto the outer circular surface of the right end of the wheel support shaft. The floating seal seat and the locking nut are detachably and securely connected by a first O-ring seal. The right end face of the wheel hub and the left end face of the floating seal seat are sealed together by a second floating sealing ring assembly.

2. The brake wheel axle with a two-in-one brake for engineering machinery according to claim 1, characterized in that: The parking brake cylinder body is provided with a second through hole, the left end of the second through hole is provided with a second layer hole, and the right end is provided with a third layer hole. The internal gear ring is provided on the inner wall of the third layer hole. The outer circular surface of the left end of the parking brake piston is provided with an outwardly extending first flange. The outer side of the first flange forms a movable sealing connection with the inner side of the second layer hole. The outer side of the right end of the parking brake piston forms a movable sealing connection with the inner side of the second through hole. A sealed parking brake hydraulic cavity is formed between the right end face of the first flange, the inner circular surface and bottom surface of the second layer hole, and the outer side of the right end of the parking brake piston. The outer circular surface of the parking brake cylinder body is provided with a radial parking brake release oil inlet at a position corresponding to the parking brake hydraulic cavity. The axis of the parking brake release oil inlet is flush with the bottom surface of the second layer hole, so that the parking brake release oil inlet is connected to the parking brake hydraulic cavity.

3. A brake wheel axle with a two-in-one brake for engineering machinery according to claim 2, characterized in that: The service brake cylinder body is provided with a third through hole, and a fourth layer hole is provided at the left end of the third through hole. The inner diameter of the fourth layer hole is the same as the inner diameter of the second through hole. A second flange extending outward is provided on the outer side of the left end of the service brake piston. The outer side of the second flange forms a movable sealing connection with the inner side of the fourth layer hole. The outer circular surface of the right side of the service brake piston forms a movable sealing connection with the inner side of the third through hole. A sealed service brake hydraulic cavity is formed between the right end face of the second flange, the inner circular surface and bottom surface of the fourth layer hole, and the outer side of the right end of the service brake piston. A radial service brake oil inlet is provided on the outer circular surface of the service brake cylinder body at a position corresponding to the service brake hydraulic cavity. The axis of the service brake oil inlet is flush with the bottom surface of the fourth layer hole, so that the service brake oil inlet is connected to the service brake hydraulic cavity.

4. A brake wheel axle with a two-in-one brake for engineering machinery according to claim 2, characterized in that: The parking brake cylinder has a radial brake lubricating oil inlet on the right end of its outer circular surface. The brake lubricating oil inlet is connected to the third layer hole, and the axis of the brake lubricating oil inlet is flush with the right end face of the third layer hole. The parking brake piston has a radial oil hole on its right outer circular surface, which is connected to the third layer hole and the first through hole.

5. A brake wheel axle with a two-in-one brake for engineering machinery according to claim 2, characterized in that: The first flange outer circular surface and the parking brake piston right outer circular surface are both provided with a first annular sealing groove. A Y-shaped sealing ring is provided in the first annular sealing groove. The left and right connecting surfaces of the parking brake piston and the parking brake cylinder are sealed by two Y-shaped sealing rings.

6. A brake wheel axle with a two-in-one brake for engineering machinery according to claim 3, characterized in that: The second flange outer circular surface and the right outer circular surface of the service brake piston are both provided with a second annular sealing groove. A combined sealing ring is provided in the second annular sealing groove. The connection surfaces of the service brake piston and the left and right sides of the service brake cylinder are sealed by two combined sealing rings. Both the outer circular surface of the second flange and the outer circular surface of the right side of the service brake piston are provided with annular grooves, and a guide ring is provided in the annular grooves.

7. A brake wheel axle with a two-in-one brake for engineering machinery according to claim 2, characterized in that: The parking brake cylinder body is provided with a first inner stop on the left side, and the first flange is provided with a first outer stop on the right side that mates with the first inner stop. The first flange is provided with a first sealing groove at the root of the first outer stop on the right side, and a second O-ring is provided in the first sealing groove. The parking brake cylinder body and the first flange are connected to each other through the first inner stop and the first outer stop, and are sealed by the first O-ring. The parking brake cylinder body has a fifth layer hole on the right side of the third layer hole, and the service brake cylinder body has a second outer stop on the left side surface. The service brake cylinder body has a second sealing groove at the root of the second outer stop on the left side surface. The second sealing groove has a third O-ring seal. The parking brake cylinder body and the service brake cylinder body are connected to the fifth layer hole through the second outer stop and sealed by the second O-ring seal. The right side of the service brake cylinder body and the left side of the second flange are both provided with annular grooves on the end face that cooperate with the first floating sealing ring assembly, and the first floating sealing ring assembly is located in the annular groove on the end face.

8. A brake wheel axle with a two-in-one brake for engineering machinery according to claim 1, characterized in that: The wheel support shaft has an internal exhaust channel, which includes a first exhaust hole, a second exhaust hole, and a third exhaust hole. The first exhaust hole is located at the center of the wheel support shaft and is coaxial with the wheel support shaft. The left end of the first exhaust hole has a countersunk threaded hole, and an internal hexagon screw is connected to the countersunk threaded hole. A copper washer is provided at the connection between the internal hexagon screw and the bottom surface of the countersunk hole. The upper end face of the first flange is a tangent plane. The second exhaust hole is a radial hole located on the tangent plane and communicates with the first exhaust hole. The third exhaust hole is a radial hole located on the outer circular surface of the right end of the wheel support shaft, between the first tapered roller bearing and the second tapered roller bearing, and communicates with the first exhaust hole.

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