A parking brake forced release device and wheel reduction gear

Abstract

The utility model discloses a kind of parking brake forced release device and wheel edge reduction gear, belong to brake technical field. Including brake release bolt, brake release ejector rod, connecting hub, brake housing, piston, sealing assembly and anti-rotation unit. The piston is installed in the brake housing and abuts against the parking brake, and elastic member is equipped between the piston and the parking brake. The brake housing is equipped with light hole, the brake release ejector rod is installed in the light hole, and one end is in abutment with the piston. The connecting hub connects the opening of the light hole, the brake release bolt passes through the connecting hub, and tail portion is in abutment with the other end of the brake release ejector rod. The sealing assembly and the anti-rotation unit are respectively installed between the brake release ejector rod and the brake housing. The forced release device provided by the utility model is compact in structure, reliable in sealing and easy to install, and can quickly replace spare parts and maintain conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of brake technology, specifically relating to a parking brake forced release device and a wheel-side reducer. Background Technology

[0002] As a type of road machinery, tire rollers are widely used in road construction. Because their working principle relies on their own weight to compact the road surface, tire rollers are generally designed to be quite heavy. When a tire roller malfunctions and cannot move, it needs to be towed.

[0003] The wheel-side reducer is the transmission mechanism of the road roller. It is equipped with a parking brake device. The parking brake must be released before the road roller moves. Under normal operation, the parking brake is released by the piston being pushed open by the hydraulic oil. If the hydraulic system fails and cannot provide hydraulic oil, the parking brake is released by the forced release mechanism.

[0004] Patent CN115451094A discloses a wheel-side reducer with an integral T-shaped structure. In this structure, the brake release bolt is a single piece. During use, the brake release bolt undergoes both rotational and linear motion. The O-ring seal is simultaneously subjected to rotational and axial forces, making it highly susceptible to torque deformation and leading to leakage of the pressure oil chamber. To restore normal operation of the reducer, it is necessary to disassemble the reducer and replace the O-ring seal, which is cumbersome. Patent CN205401550U discloses a mechanical release brake device for a reducer. During use, rotating the inclined bolt drives the tail nut to perform linear motion, pulling the piston to release the brake. In this structure, the O-ring seal is located at the rotating inclined bolt, which is subject to rotational force and torque risk. Furthermore, this structure occupies a large space and is not suitable for existing wheel-side reducers. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a parking brake forced release device and a wheel-side reducer. The forced release device provided by this invention ensures that the sealing components only perform linear motion, reducing wear on the sealing components. It has a compact overall structure, reliable sealing, and simple installation, allowing for quick component replacement and convenient maintenance.

[0006] This utility model provides the following technical solution: In one aspect, a parking brake forced release device is provided, comprising a brake release bolt, a brake release push rod, a connecting hub, a brake housing, a piston, a sealing assembly, and an anti-rotation unit; The piston is installed inside the brake housing and abuts against the parking brake, and an elastic element is provided between the piston and the parking brake; The brake housing is provided with a light hole, and the brake release push rod is installed in the light hole, with one end abutting against the piston; The connecting hub connects to the opening of the light hole, the brake release bolt passes through the connecting hub, and its tail abuts against the other end of the brake release push rod; The sealing assembly and the anti-rotation unit are respectively installed between the brake release push rod and the brake housing.

[0007] Furthermore, the sealing assembly includes a first sealing ring and a second sealing ring. The side wall of the brake release push rod that contacts the light hole is provided with a first sealing groove and a second sealing groove. The first sealing ring is fitted inside the first sealing groove, and the second sealing ring is fitted inside the second sealing groove.

[0008] Furthermore, a first groove is provided on the side wall of the brake release push rod, and a second groove is provided on the inner wall of the light hole of the brake housing. One end of the anti-rotation unit is engaged in the first groove, and the other end is engaged in the second groove and slidably connected with the second groove.

[0009] Furthermore, the anti-rotation unit is an anti-rotation ball.

[0010] Furthermore, the brake release bolt is provided with an external thread and a first internal thread hole. The brake release bolt is threadedly connected to the connecting hub through the external thread, and the first internal thread hole is located at the end of the brake release bolt away from the brake release push rod.

[0011] Furthermore, the external thread of the brake release bolt is also provided with an anti-loosening nut.

[0012] Furthermore, the first internal threaded hole is equipped with a disassembly screw.

[0013] Furthermore, the side of the brake release push rod that contacts the brake release bolt is provided with a second internal threaded hole, and the thread parameters of the second internal threaded hole are the same as those of the first internal threaded hole.

[0014] Furthermore, the elastic element is a spring, and the piston has a spring mounting hole inside the side that abuts against the parking brake, and the spring is located in the spring mounting hole.

[0015] In a second aspect, a wheel-side speed reducer is provided, including the parking brake forced release device described in any one of the first aspects.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model provides a brake release device. On the one hand, during the tightening of the brake release bolt and the connecting hub, the brake release bolt simultaneously rotates axially, pushing the brake release push rod to move linearly in the radial direction, thereby squeezing the piston and finally closing the parking brake. On the other hand, an anti-rotation unit is provided between the brake release push rod and the brake housing, which can prevent the brake release push rod from rotating during linear movement, effectively avoiding the twisting and deformation of the sealing component. 2. This utility model features a double sealing ring between the brake release push rod and the light hole in the brake housing, which enhances the overall sealing reliability of the structure. The device of this utility model occupies little radial space, has a compact structure, is easy to disassemble and assemble, and can replace the seal without disassembling the wheel-side reducer, making maintenance convenient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the parking brake forced release device in Embodiment 1 of this utility model.

[0018] The markings in the diagram are as follows: 1. Brake release bolt; 2. Anti-loosening nut; 3. Brake release push rod; 4. First sealing ring; 5. Second sealing ring; 6. Disassembly screw; 7. Connecting hub; 8. Brake housing; 9. Piston; 10. Spring; 11. Anti-rotation unit; 12. First groove; 13. Second groove. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0020] It should be noted that in the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "comprising," "including," "having," "containing," etc., as used herein are open-ended terms, meaning they include but are not limited to.

[0022] Example 1

[0023] like Figure 1 As shown, this embodiment provides a parking brake forced release device, including a brake release bolt 1, a brake release push rod 3, a connecting hub 7, a brake housing 8, a piston 9, a sealing assembly, and an anti-rotation unit 11.

[0024] A light hole is provided inside the brake housing 8. A connecting hub 7 is installed at the opening of the light hole in the brake housing 8. A brake release push rod 3 is installed inside the brake housing 8. One end of the brake release push rod 3 contacts the brake release bolt 1, and the other end of the brake release push rod 3 abuts against one end of the piston 9. The piston 9 is mounted on the brake housing 8, and its other end abuts against the parking brake. An elastic element 10 is provided between the piston 9 and the parking brake. In this embodiment, the elastic element 10 is a spring. A spring mounting hole is provided inside the piston 9 on the side that contacts the parking brake, and the spring is located in the spring mounting hole.

[0025] The brake release bolt 1 passes through the anti-loosening nut 2 and the connecting hub 7 and is inserted into the light hole of the brake housing 8, abutting against the brake release push rod 3. In this embodiment, the brake housing 8 is provided with two light holes, and there are two brake release devices. The two devices share a connecting hub 7, which is provided with two threaded holes.

[0026] A sealing assembly is provided between the brake release push rod 3 and the aperture of the brake housing 8. The sealing assembly includes a first sealing ring 4 and a second sealing ring 5. In this embodiment, both the first sealing ring 4 and the second sealing ring 5 are O-rings. In this embodiment, a first sealing groove and a second sealing groove are provided on the side wall where the brake release bolt 1 contacts the aperture of the brake housing 8. The first sealing ring 4 and the second sealing ring 5 are respectively fitted into the first sealing groove and the second sealing groove, and contact the inner wall of the aperture of the brake housing 8. Providing a sealing assembly between the brake release push rod 3 and the aperture of the brake housing 8 can prevent pressure oil leakage and enhance the overall sealing reliability of the structure.

[0027] An anti-rotation unit 11 is also provided between the brake release push rod 3 and the light hole of the brake housing 8. A first groove 12 is provided on the side wall of the brake release push rod 3, and a second groove 13 is provided on the inner wall of the light hole of the brake housing 8. One end of the anti-rotation unit 11 is engaged in the first groove 12, and the other end is engaged in the second groove 13, and is slidably connected with the second groove 13. In this embodiment, the anti-rotation unit 11 is an anti-rotation steel ball, the first groove 12 is a semi-circular groove, the size of which is the same as the diameter of the anti-rotation steel ball, and the second groove 13 is a semi-circular elongated groove, the length direction of which is the same as the movement direction of the brake release push rod 3, and the diameter of which is the same as the diameter of the anti-rotation steel ball. The anti-rotation steel ball is precisely engaged in the second groove 13 and can slide along the length direction of the second groove 13.

[0028] The brake release bolt 1 has an external thread and a first internal threaded hole. The brake release bolt 1 is threadedly connected to the lock nut 2 and the connecting hub 7 through the external thread. The first internal threaded hole is located at the end of the brake release bolt 1 away from the brake release push rod 3, and a disassembly screw 6 is installed in the first internal threaded hole. A second internal threaded hole is provided on the side of the brake release push rod 3 that contacts the brake release bolt 1. The thread parameters of the second internal threaded hole are the same as those of the first internal threaded hole, and the disassembly screw 6 can be inserted into the second internal threaded hole.

[0029] This embodiment provides the working principle of the device: When the forced release device is activated, the anti-loosening nut 2 is loosened, and the brake release bolt 1 is tightened to the connecting hub 7. During the tightening process, the brake release bolt 1 rotates axially, presses against the brake release push rod 3, and pushes the brake release push rod 3 towards the piston 9 until it overcomes the spring force of the spring 10 and pushes the piston 9 open, and the brake temporarily closes the parking brake function.

[0030] When the forced release device is turned off, the brake release bolt 1 is loosened. The brake release bolt 1 moves axially away from the brake release push rod 3, the brake release push rod 3 is released, the spring 10 presses the piston 9 to push the brake release push rod 3 back to the initial position, and finally the anti-loosening nut 2 is tightened, and the brake restores the parking brake function.

[0031] During the opening and closing of the forced release device, the brake release bolt 1 simultaneously rotates axially, generating a radial rotational force on the brake release push rod 3. The anti-rotation unit 11 restricts the rotation of the brake release push rod 3. Simultaneously, the anti-rotation unit 11 moves linearly within the second groove 13 along with the brake release push rod 3, ensuring that the brake release push rod 3 only moves in a linear motion. The first sealing ring 4 and the second sealing ring 5, disposed between the brake release push rod 3 and the aperture of the brake housing 8, reciprocate linearly along with the brake release push rod 3. In this embodiment, the range of motion of the sealing assembly is very small, not exceeding 5 mm.

[0032] When the sealing assembly reaches its lifespan limit after prolonged use and needs replacement, remove the disassembly screw 6 from the brake release bolt 1, loosen the lock nut 2, loosen and remove the brake release bolt 1, screw the disassembly screw 6 into the first internal threaded hole of the brake release push rod 3, pull out the brake release push rod 3, and replace the sealing assembly. After replacement, reinstall the brake release push rod 3, brake release bolt 1, and lock nut 2 in sequence, and finally tighten the lock nut 2.

[0033] This utility model adopts a split structure design. By restricting the rotation of the brake release top rod 3, it ensures that the sealing component only performs linear motion, which can solve the problem of easy deformation and wear of the sealing component. The device provided has a simple structure, is easy to disassemble and assemble, and is also convenient for later maintenance.

[0034] Example 2

[0035] This embodiment provides a wheel-side speed reducer, including the parking brake forced release device provided in Embodiment 1.

[0036] With the parking brake forced release device of this utility model, the sealing components can be replaced without removing the wheel-side reducer, making maintenance very convenient.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A parking brake forced release device, characterized in that, Includes brake release bolt (1), brake release push rod (3), connecting hub (7), brake housing (8), piston (9), sealing assembly and anti-rotation unit (11); The piston (9) is installed inside the brake housing (8) and abuts against the parking brake. An elastic element (10) is provided between the piston (9) and the parking brake. The brake housing (8) is provided with a light hole, and the brake release push rod (3) is installed in the light hole, with one end abutting against the piston (9); The connecting hub (7) is connected to the opening of the light hole, the brake release bolt (1) passes through the connecting hub (7), and its tail abuts against the other end of the brake release push rod (3); The sealing assembly and the anti-rotation unit (11) are respectively installed between the brake release push rod (3) and the brake housing (8).

2. The parking brake forced release device according to claim 1, characterized in that, The sealing assembly includes a first sealing ring (4) and a second sealing ring (5). The side wall of the brake release push rod (3) that contacts the light hole is provided with a first sealing groove and a second sealing groove. The first sealing ring (4) is fitted in the first sealing groove, and the second sealing ring (5) is fitted in the second sealing groove.

3. The parking brake deactivation device according to claim 1, characterized in that The brake release push rod (3) has a first groove (12) on its side wall, and the brake housing (8) has a second groove (13) on its inner wall of the light hole. One end of the anti-rotation unit (11) is engaged in the first groove (12), and the other end is engaged in the second groove (13), and is slidably connected with the second groove (13).

4. The parking brake deactivation device according to claim 3, characterized in that The anti-rotation unit is an anti-rotation ball.

5. The parking brake deactivation device of claim 1, wherein The brake release bolt (1) is provided with an external thread and a first internal thread hole. The brake release bolt (1) is threadedly connected to the connecting hub (7) through the external thread. The first internal thread hole is located at the end of the brake release bolt (1) away from the brake release push rod (3).

6. The parking brake deactivation device according to claim 5, characterized in that The brake release bolt (1) is also provided with a lock nut (2) on its external thread.

7. The parking brake forced release device according to claim 5, characterized in that, A disassembly screw (6) is provided in the first internal threaded hole.

8. The parking brake deactivation device according to claim 7, characterized in that The brake release push rod (3) has a second internal thread hole on the side that contacts the brake release bolt (1), and the thread parameters of the second internal thread hole are the same as those of the first internal thread hole.

9. The parking brake deactivation device of claim 1, wherein, The elastic element (10) is a spring, and the piston (9) has a spring mounting hole inside the side that abuts against the parking brake, and the spring is located in the spring mounting hole.

10. A wheel reduction unit characterized by, Includes the parking brake forced release device as described in any one of claims 1 to 9.

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