A brake gap self-compensation hub brake

Abstract

The utility model relates to non - motor vehicle brake technology field discloses a kind of brake gap self-compensation hub brakes, including shell and the brake shoe being arranged at the one side of shell, the brake shoe one end is connected by pivot rotation, and the other end is abutted in the two sides of the one end of driving assembly and is driven brake shoe opening and closing brake by driving assembly, the driving assembly includes: camshaft, rocker arm being arranged at the one end of camshaft and adjusting assembly being arranged at the one end of brake shoe and with the other end of camshaft abutted, the rocker arm rotation drives camshaft to rotate an angle, and driving adjusting assembly and brake shoe open brake together, the adjusting assembly is configured as when brake shoe wear makes brake gap increase to a preset value adjusting brake shoe abutted end moves out and opens a distance to compensate. Solve the problem that the gap between brake shoe and wheel hub becomes larger after brake shoe wears after long time use in prior art, causes brake performance to drop or brake failure, causes the problem of security risk to the travel of vehicle.

Description

Technical Field

[0001] This utility model relates to the field of non-motorized vehicle brake technology, specifically to a self-compensating hub brake for brake clearance. Background Technology

[0002] As urban traffic pressure increases, using bicycles, electric bikes, or electric scooters as basic modes of transportation is gradually becoming a common habit. The braking system in these vehicles is crucial for ensuring safe travel.

[0003] Drum brakes are widely used in the aforementioned vehicles due to their good cost performance. For example, CN216715038U discloses an improved drum brake, whose main working principle is as follows: the rocker arm rotates to drive the camshaft to rotate, which drives the brake shoes on both sides to open and press against the brake drum. The friction between the brake drum and the shoe assembly stops the wheel from rotating. After long-term use, the gap between the brake shoes and the wheel hub increases due to long-term wear, which may cause a decrease in braking performance or brake failure, posing a safety hazard to the vehicle. Common adjustment methods at this time are: First, replace the brake or brake shoes. However, replacing the brake or brake shoes when the braking performance is slightly reduced is time-consuming and laborious, and the wear is not sufficient, resulting in a waste of resources. Second, manually adjust the brake cable screw to tighten the brake cable. However, it is difficult to ensure timeliness and accuracy when adjusting the brake clearance manually.

[0004] To this end, our company has disclosed, for example, CN217056065U a self-adjusting drum brake for electric vehicles. However, although this structure can achieve self-adjustment of brake wear clearance, it is inconvenient and time-consuming to install in actual assembly. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a self-compensating drum brake with a simple structure. It can automatically and promptly adjust the appropriate brake clearance of the drum brake without manual operation, ensuring that the brake shoes can quickly and accurately contact the brake drum during braking, thus enabling the vehicle to stop in a timely and reliable manner. This overcomes the problem in existing technologies where, after prolonged use, the gap between the brake shoes and the wheel hub increases due to wear, resulting in decreased braking performance or brake failure, which poses a safety hazard to the vehicle.

[0006] To achieve the above objectives, this application adopts the following technical solution.

[0007] This utility model is a self-compensating hub brake for brake clearance, including a housing and a brake shoe disposed on one side of the housing. One end of the brake shoe is pivotally connected, and the other end abuts against both sides of one end of a drive assembly. The drive assembly drives the brake shoe to open and close for braking. The drive assembly includes a camshaft, a rocker arm disposed at one end of the camshaft, and an adjustment assembly disposed at one end of the brake shoe and abutting against the other end of the camshaft. The rotation of the rocker arm causes the camshaft to rotate at an angle, and drives the adjustment assembly and the brake shoe to open and close together for braking. The adjustment assembly is configured to adjust the brake shoe abutting end to move outward and open by a distance to compensate when the brake shoe wears and the brake clearance increases to a preset value.

[0008] A further improvement is that the adjustment assembly includes: an adjustment rod symmetrically arranged at the end of the brake shoe, a toggle structure and an elastic structure arranged at one end of the camshaft, the adjustment rod having an adjustment ratchet adapted to the toggle structure, one end of the adjustment rod having a threaded adjustment part adapted to the brake shoe, and the other end having a limiting part adapted to abut against a cam part at one end of the camshaft, the toggle structure being movably sleeved on the cam part, and an elastic structure being provided below the toggle structure to allow the toggle structure to abut against the adjustment ratchet.

[0009] A further improvement is that the actuating structure is symmetrically provided with pawls adapted to the adjusting ratchet, and a stop hole adapted to the cam is provided at the center position.

[0010] A further improvement is that a limiting ring groove is provided on the other side of the toggle structure.

[0011] A further improvement is that a concave clearance portion is provided on the corresponding side of the claw.

[0012] A further improvement is that the adjustment assembly also includes a drive reinforcement structure, one end of which is rotatably connected to the adjustment rod and the other end of which abuts against the cam portion. The drive reinforcement structure has a reinforcing block adapted to the cam portion on one side and a limiting support portion on the other side. The limiting support portion is adapted to and rotatably connected to a limiting hole provided at one end of the adjustment rod.

[0013] A further improvement is that the drive reinforcement structure is made of wear-resistant material.

[0014] A further improvement is that a limiting top cover is provided on the top of the cam section, and the limiting top cover is detachably connected by connecting bolts.

[0015] Compared with the prior art, the advantages of this utility model are: This application provides a drive assembly with a self-compensation function for adjusting the wear clearance of the brake shoe by setting a drive assembly at one end of the brake shoe. The drive assembly has a toggle structure on the camshaft that rotates with the camshaft, which actuates the adjusting ratchet on the adjusting rod at the end of the brake shoe. The rotation of the adjusting ratchet drives the adjusting rod to rotate, adjusting the brake shoe to move outward and expand, thereby achieving self-compensation for the wear clearance. The adjustment is convenient and does not require manual operation, allowing for timely self-adjustment of the wear clearance. When the wear clearance is not reached, the actuating structure reciprocates with the camshaft under the action of the elastic structure, without performing clearance adjustment compensation, so that the brake shoe and brake drum maintain a reasonable braking fit clearance and will not get stuck due to the brake clearance being too small; when the wear clearance reaches the preset wear amount, the actuating structure, driven by the camshaft, passes one adjusting ratchet tooth of the adjusting ratchet and engages with the next ratchet tooth, thereby driving the threaded adjusting part of the other end of the adjusting rod to rotate outward relative to the adjusting hole adapted to the brake shoe, so that one end of the brake shoe is opened to perform clearance compensation. The structure is simple, the adjustment is timely, accurate and convenient; The reinforced drive structure improves the wear resistance of the adjusting rod that abuts the camshaft, preventing excessive wear from affecting the clearance adjustment accuracy. At the same time, the reinforced drive structure has a columnar limit support that is adapted to the limit hole at one end of the adjusting rod for rotatable connection. When adjustment is required, it ensures that the adjusting rod can rotate for adjustment, while the reinforced drive structure and the cam remain relatively stationary, making the adjustment smoother and effectively improving the service life and adjustment accuracy of the adjusting rod. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is an exploded view of the component of this utility model.

[0018] Figure 3 This is an exploded view of the drive component of this utility model.

[0019] Figure 4 This is a schematic diagram of the installation of one side of the drive component of this utility model.

[0020] Figure 5 This is a three-dimensional schematic diagram of the adjusting rod and the drive reinforcement structure of this utility model.

[0021] Figure 6 This is a three-dimensional schematic diagram of one side of the toggle structure of this utility model.

[0022] Figure 7 This is a three-dimensional structural diagram of the other side of the toggle structure of this utility model.

[0023] Attached image labels: 10 housing; 12 camshaft hole; 11 central shaft mounting hole; 20 brake shoe; 21 adjusting hole; 30 pivot; 40 rocker arm; 50 drive assembly; 51 camshaft; 511 cam section; 512 limiting top cover; 513 connecting bolt; 52 adjusting assembly; 53 adjusting rod; 531 adjusting ratchet; 532 threaded adjusting section; 533 limiting section; 54 actuating structure; 541 pawl; 542 stop hole; 544 limiting ring groove; 543 concave clearance section; 55 elastic structure; 56 drive reinforcement structure; 561 reinforcing block; 562 limiting support section. Detailed Implementation

[0024] To enhance understanding of this utility model, it will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain this utility model and does not constitute a limitation on the scope of protection of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", 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 simplifying the description, and do not indicate or imply that the combination or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1-7The diagram shows a self-compensating hub brake, comprising a housing 10 and a brake shoe 20 disposed on one side of the housing 10. One end of the brake shoe 20 is rotatably connected via a pivot 30, and the other end abuts against both sides of one end of a drive assembly 50. The drive assembly 50 drives the brake shoe 20 to open and close for braking. The drive assembly 50 includes: a camshaft 51, a rocker arm 40 disposed at one end of the camshaft 51, and an adjustment assembly 52 disposed at one end of the brake shoe 20 and abutting against the other end of the camshaft 51. Rotation of the rocker arm 40 causes the camshaft 51 to rotate by an angle, and drives the adjustment assembly 52 and the brake shoe 20 to open the brake together. The adjustment assembly 52 is configured to compensate for the increased brake clearance caused by wear of the brake shoe 20 to a preset value by adjusting the outward movement of the abutting end of the brake shoe 20 by a distance. The adjustment assembly 52 includes: an adjustment rod 53 symmetrically disposed at the end of the brake shoe 20, and a... The camshaft 51 has a toggle structure 54 and an elastic structure 55 at one end. The adjusting rod 53 is equipped with an adjusting ratchet 531 that is adapted to the toggle structure 54. One end of the adjusting rod 53 is equipped with a threaded adjusting part 532 that is adapted to connect with the brake shoe 20. The other end is equipped with a limiting part 533 that is adapted to abut against the cam part 511 at one end of the camshaft 51. The toggle structure 54 is movably sleeved on the cam part 511. The elastic structure 55 is provided below the toggle structure 54 so that the toggle structure 54 and the adjusting ratchet 531 are adapted to abut against each other. The pivot 30 is fixed inside the housing 10. The housing 10 is a circular structure. The center position is provided with a central shaft mounting hole 11 that is adapted to the central shaft of the motor. The pivot 30 and the camshaft hole 12 are symmetrically arranged on both sides of the central shaft mounting hole 11. The camshaft 51 is inserted into the camshaft hole 12. The rocker arm 40 and the camshaft 51 are detachably connected to the other side of the housing 10.

[0028] The above-mentioned drive assembly 50 with a self-compensation function for adjusting the wear clearance of the brake shoe 20 is provided at one end of the brake shoe 20. The drive assembly 50 has a toggle structure 54 on the camshaft 51 that rotates with the camshaft 51. The toggle structure 54 actuates the adjusting ratchet 531 on the adjusting rod 53 at the end of the brake shoe 20. The rotation of the adjusting ratchet 531 drives the adjusting rod 53 to rotate, adjusting the brake shoe 20 to move outward and expand, thus achieving self-compensation for the wear clearance. The adjustment is convenient and can be prepared in time for self-adjustment of the wear clearance without manual operation. When the wear clearance is not reached, the toggle structure... Under the action of the elastic structure 55, the camshaft 51 reciprocates without gap adjustment compensation, so that the brake maintains a normal and reasonable braking gap and does not cause brake jamming. When the wear gap reaches the preset wear amount, the actuating structure 54, driven by the camshaft 51, passes over one adjusting ratchet tooth of the adjusting ratchet 531 and engages with the next ratchet tooth, thereby driving the threaded adjusting part 532 at the other end of the adjusting rod 53 to rotate outward relative to the adjusting hole 21 adapted to the brake shoe 30, so that one end of the brake shoe is opened to perform gap compensation. The structure is simple, the adjustment is timely, accurate and convenient.

[0029] An alternative implementation: such as Figure 3-4As shown in Figures 6-7, the actuating structure 54 is symmetrically provided with pawls 541 adapted to the adjusting ratchet 531, and a stop hole 542 adapted to the cam part 511 is provided at the center position; preferably, the actuating structure 54 is a circular plate structure, the pawls 541 are protruding outward and provided on one side of the circular plate structure, and the stop hole 542 is a slightly circular structure.

[0030] An alternative implementation: such as Figure 7 As shown, a limiting ring groove 544 is also provided on the other side of the actuating structure 54. The limiting ring groove 544 plays a guiding, limiting and retaining role for the elastic structure 55 provided below. The elastic structure 55 is preferably a compression spring, which is sleeved below the cam part 511, and one end abuts against the end face of the camshaft hole 12 provided on the housing 10. Figure 4 As shown.

[0031] An alternative implementation: such as Figure 6-7 As shown, the pawl 541 is also provided with a concave relief portion 543 on the corresponding side. The concave relief portion 543 can ensure that the pawl 541 moves smoothly and reliably with the camshaft 51 without interference, and the structure is more reasonable.

[0032] An alternative implementation: such as Figure 3 , 5 As shown, the adjustment assembly 52 also includes a drive reinforcement structure 56. One end of the drive reinforcement structure 56 is rotatably connected to the adjustment rod 53, and the other end abuts against the cam portion 511. A reinforcing block 561 adapted to the cam portion 511 is provided on one side of the drive reinforcement structure 56, and a limiting support portion 562 is provided on the other side. The limiting support portion 562 is rotatably connected to a limiting hole 534 at one end of the adjustment rod 53. The drive reinforcement structure 56 improves the wear resistance of the adjustment rod 53 abutting against the camshaft 51, preventing excessive wear from affecting the clearance adjustment accuracy. Simultaneously, the columnar limiting support portion 562 on the drive reinforcement structure 56 is rotatably connected to the limiting hole 534 at one end of the adjustment rod 53. When adjustment is required, it ensures that the adjustment rod 53 rotates for adjustment, while the drive reinforcement structure 56 and the cam portion 511 remain relatively stationary, making adjustment smoother and effectively improving the service life and adjustment accuracy of the adjustment rod 53.

[0033] Preferably, the drive reinforcement structure 56 is made of wear-resistant material; the drive reinforcement structure 56 can also be carburized or heat-treated to improve its wear resistance.

[0034] An alternative implementation: such as Figure 3 , 5 As shown, the cam part 511 is also provided with a limiting top cover 512, which is detachably connected by connecting bolts 513; the setting of the limiting top cover 512 can ensure smooth and reliable driving and prevent the brake shoe 20 from becoming unstable and climbing.

[0035] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A self-compensating hub brake for brake clearance, comprising a housing (10) and a brake shoe (20) disposed on one side of the housing (10), wherein one end of the brake shoe (20) is rotatably connected via a pivot (30), and the other end abuts against both sides of one end of a drive assembly (50), and the drive assembly (50) drives the brake shoe (20) to open and close for braking, characterized in that: The drive assembly (50) includes: a camshaft (51), a rocker arm (40) disposed at one end of the camshaft (51), and an adjustment assembly (52) disposed at one end of the brake shoe (20) and abutting against the other end of the camshaft (51). The rocker arm (40) rotates to drive the camshaft (51) to rotate by an angle, and drives the adjustment assembly (52) and the brake shoe (20) to open the brake together. The adjustment assembly (52) is configured to adjust the abutting end of the brake shoe (20) to move outward by a distance to compensate when the brake shoe (20) wears and the brake clearance increases to a preset value.

2. The self-compensating hub brake for brake clearance according to claim 1, characterized in that: The adjustment assembly (52) includes: an adjustment rod (53) symmetrically arranged at the end of the brake shoe (20), a toggle structure (54) and an elastic structure (55) arranged at one end of the camshaft (51). The adjustment rod (53) is provided with an adjustment ratchet (531) adapted to the toggle structure (54). One end of the adjustment rod (53) is provided with a threaded adjustment part (532) adapted to connect with the brake shoe (20), and the other end is provided with a limiting part (533) adapted to abut against the cam part (511) provided at one end of the camshaft (51). The toggle structure (54) is movably sleeved on the cam part (511). The elastic structure (55) is provided below the toggle structure (54) so ​​that the toggle structure (54) adapts to abut against the adjustment ratchet (531).

3. The self-compensating hub brake for brake clearance according to claim 2, characterized in that: The actuation structure (54) is symmetrically provided with pawls (541) adapted to the adjusting ratchet (531), and a stop hole (542) adapted to the cam part (511) is provided at the center.

4. The self-compensating hub brake for braking clearance according to claim 3, characterized in that: The other side of the actuating structure (54) is also provided with a limiting ring groove (544).

5. The self-compensating hub brake for braking clearance according to claim 3, characterized in that: The claw (541) is also provided with a concave relief portion (543) on the corresponding side.

6. The self-compensating hub brake for braking clearance according to any one of claims 1-5, characterized in that: The adjustment assembly (52) further includes a drive reinforcement structure (56), one end of which is rotatably connected to the adjustment rod (53), and the other end abuts against the cam part (511). The drive reinforcement structure (56) has a reinforcement block (561) adapted to the cam part (511) on one side and a limiting support part (562) on the other side. The limiting support part (562) is adapted to and rotatably connected to the limiting hole (534) provided at one end of the adjustment rod (53).

7. The self-compensating hub brake for brake clearance according to claim 6, characterized in that: The drive reinforcement structure (56) is made of wear-resistant material.

8. The self-compensating hub brake for brake clearance according to claim 6, characterized in that: The cam portion (511) is also provided with a limiting top cover (512), which is detachably connected by a connecting bolt (513).

Images