Drum brake return spring leaf

Abstract

The utility model provides drum type brake return spring piece belongs to brake accessory technical field, it includes brake backplate, sets up the drum type brake assembly and return subassembly of brake backplate near wheel side, drum type brake assembly is located brake inner race place of wheel, with brake inner race of wheel and can contact connection, drum type brake assembly includes two brake shoes, the upper end of two brake shoes is hinged with the connecting portion in common, return subassembly includes reset spring and two connecting hook head, two connecting hook head are located reset spring both ends respectively, with reset spring integral molding, the lateral wall of two brake shoes is provided with the plug -in board symmetrically, the lateral wall of plug -in board is fixed with the spring piece block perpendicular to plug -in board surface, spring piece block is provided with reset pull hole corresponding with connecting hook head, connecting hook head hooks on reset pull hole. The utility model discloses through the connecting unit between spring and brake shoe can effectively improve reset spring and brake shoe stability when returning.

Description

Technical Field

[0001] This utility model belongs to the technical field of brake accessories, and relates to a brake return spring, especially a drum brake return spring. Background Technology

[0002] Drum brakes are widely used in braking systems of various vehicles due to their simple structure and low manufacturing cost. The return spring is one of the core components of a drum brake, and its performance directly affects the braking effect and service life. However, existing springs are prone to problems such as uneven return and loosening during long-term use. The connection between the spring and the brake shoes is usually a hook connection, which can easily lead to loosening of the return spring, reducing the stability of the brake during post-braking reset.

[0003] Therefore, it is necessary to provide a return spring plate that provides a stable connection between the spring and the brake shoe, thereby ensuring the stability of the brake's return to its original position after braking. Utility Model Content

[0004] The purpose of this utility model is to provide a return spring plate for a drum brake, so as to solve the technical problem in the prior art that the connection between the spring and the brake shoe is not stable enough, which will reduce the stability of the brake when returning to its original position after braking.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: A drum brake return spring includes a brake backing plate, a drum brake assembly and a return assembly disposed on the brake backing plate near the wheel. The drum brake assembly is located at the inner brake ring of the wheel and is in contact with the inner brake ring of the wheel. The drum brake assembly includes two brake shoes, and the upper ends of the two brake shoes are hinged together with a connecting part. The return assembly includes a return spring and two connecting hooks. The two connecting hooks are located at both ends of the return spring and are integrally formed with the return spring. Insert plates are symmetrically arranged on the side walls of the two brake shoes. Spring plates perpendicular to the surface of the insert plates are fixed on the side walls of the insert plates. The spring plates are provided with return pull holes corresponding to the connecting hooks. The connecting hooks are hooked on the return pull holes.

[0006] The brake shoe has a mounting base for mounting a plate on its side wall. The mounting base has a slot on its side wall that corresponds to the thickness of the plate. The plate is slidably inserted into the slot. A locking screw is provided on the outside of the mounting base. The plate and the mounting base have threaded holes on their side walls that correspond to the locking screw. The plate is fixed to the slot of the mounting base by the locking screw.

[0007] The drum brake assembly includes four brake pads and a brake wheel cylinder. The four brake pads are symmetrically arranged on the outer side walls of the two brake shoes, and the brake wheel cylinder is kinetically connected to the brake shoes.

[0008] The two ends of the mounting base are detachably fixed to the outer wall of the brake shoe by mounting bolts.

[0009] The return spring is made of a high-elasticity alloy material, and its surface is coated with an anti-corrosion and wear-resistant coating.

[0010] The beneficial effects of this utility model are as follows: By providing a return spring plate for a drum brake and setting a return assembly, the return spring is simultaneously stretched during the process of the brake assembly expanding the two brake shoes outward and completing the deceleration of the wheel. After the brake shoes stop opening and lose the power to continue expanding, the return spring begins to rebound. This rebound pulls the two connecting hooks in the two return pull holes inward, and the rebound of the two connecting hooks drives the spring plate block to pull the two brake shoes back to their original positions. By making the connection unit between the spring and the brake shoes a separate installation of a plug, a spring plate block, a mounting base, and a slot, this utility model can effectively improve the stability of the return spring and brake shoes during return.

[0011] This utility model, by setting up an installation base, allows for the fixed installation of the spring plate block and the reset pull hole, which are matched with the new specification reset spring and the connecting hooks at both ends, on the outer wall of the brake shoe when the specification of the reset spring needs to be changed according to the usage environment. This improves the adjustability of the reset spring in the back plate assembly and the ease of installing and disassembling the spring plate block. Attached Figure Description

[0012] Figure 1 This is a front structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the braking assembly and the backplate assembly in this utility model; Figure 3 This is a schematic diagram of the structure of the insert plate and the mounting base in this utility model; Figure 4 for Figure 2 A magnified view of a portion of point A in the middle.

[0013] The markings in the diagram are as follows: 1. Brake backplate; 2. Wheel; 3. Brake shoe; 4. Connecting part; 5. Connecting hook; 6. Brake pad; 7. Brake wheel cylinder; 8. Return spring; 9. Insert plate; 10. Spring plate; 11. Return pull hole; 12. Mounting base; 13. Slot; 14. Mounting bolt; 15. Locking screw. Detailed Implementation

[0014] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0015] like Figures 1 to 4 As shown, this utility model provides a return spring for a drum brake, which includes a brake back plate 1, a drum brake assembly and a return assembly disposed on the brake back plate 1 near the wheel. The drum brake assembly is located at the inner brake ring of the wheel 2 and is in contact with the inner brake ring of the wheel 2. The three together constitute the main body of the drum brake. The drum brake assembly includes two brake shoes 3, and the upper ends of the two brake shoes 3 are hinged together with a connecting part 4. In addition, the return assembly in this embodiment specifically includes a return spring 8 and two connecting hooks 5. The two connecting hooks 5 are located at both ends of the return spring 8 and are integrally formed with the return spring 8, and are used to return the brake shoes 3. Insert plates 9 are symmetrically arranged on the side walls of the two brake shoes 3. Spring plates 10 perpendicular to the surface of the insert plates 9 are fixed on the side walls of the insert plates 9. The spring plates 10 are provided with return pull holes 11 corresponding to the connecting hooks 5, and the connecting hooks 5 are hooked on the return pull holes 11.

[0016] After the drum brake assembly expands the two brake shoes 3 outwards until they contact the inner brake ring of the wheel 2 to complete the deceleration, the brake shoes 3 lose their expansion power. The return spring 8, which is driven by the brake shoes 3 to stretch synchronously, begins to return to its original position. The return spring 8 indirectly drives the brake shoes 3 to return to their original position by driving the spring plate 10 and the insert plate 9 through the connecting hook head 5. Under the action of the spring plate 10 and the insert plate 9, the stability of the brake shoes 3 during the return process can be effectively guaranteed.

[0017] To further improve the stability of the spring plate 10 and the insert plate 9 during the reset process, in this embodiment, a mounting base 12 for mounting the insert plate 9 is also provided on the side wall of the brake shoe 3. The two ends of the mounting base 12 are detachably fixed to the outer side wall of the brake shoe 3 by mounting bolts 14. A slot 13 corresponding to the thickness of the insert plate 9 is opened on the side wall of the mounting base 12. The insert plate 9 is slidably inserted into the slot 13. A locking screw 15 is provided on the outside of the mounting base 12. Threaded holes corresponding to the locking screw 15 are opened on the side wall of the insert plate 9 and the mounting base 12. The insert plate 9 is fixed to the slot 13 of the mounting base 12 by the locking screw 15.

[0018] Furthermore, the drum brake assembly in this embodiment also includes four brake pads 6 and a brake wheel cylinder 7. The four brake pads 6 are symmetrically arranged on the outer side walls of the two brake shoes 3, and the brake wheel cylinder 7 is connected to the brake shoes 3 in a transmission manner.

[0019] The return spring 8 is made of a high-elasticity alloy material, and the surface of the return spring 8 is provided with an anti-corrosion and wear-resistant coating.

[0020] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A return spring plate for a drum brake, characterized in that: It includes a brake backplate (1), a drum brake assembly and a return assembly disposed on the brake backplate (1) near the wheel. The drum brake assembly is located at the brake inner ring of the wheel (2) and is in contact with the brake inner ring of the wheel (2). The drum brake assembly includes two brake shoes (3), and the upper ends of the two brake shoes (3) are hinged together with a connecting part (4). The return assembly includes a return spring (8) and two connecting hooks (5). The two connecting hooks (5) are located at both ends of the return spring (8) and are integrally formed with the return spring (8). Insert plates (9) are symmetrically arranged on the side walls of the two brake shoes (3). Spring plates (10) perpendicular to the surface of the insert plates (9) are fixed on the side walls of the insert plates (9). The spring plates (10) are provided with return pull holes (11) corresponding to the connecting hooks (5). The connecting hooks (5) are hooked on the return pull holes (11).

2. The return spring plate of the drum brake according to claim 1, characterized in that: The brake shoe (3) has a mounting base (12) for mounting the insert plate (9) on its side wall. The mounting base (12) has a slot (13) on its side wall that corresponds to the thickness of the insert plate (9). The insert plate (9) is slidably inserted into the slot (13). The mounting base (12) has a locking screw (15) on its outside. The insert plate (9) and the mounting base (12) have threaded holes corresponding to the locking screw (15) on their side walls. The insert plate (9) is fixed to the slot (13) of the mounting base (12) by the locking screw (15).

3. The return spring plate of the drum brake according to claim 1, characterized in that: The drum brake assembly also includes four brake pads (6) and a brake wheel cylinder (7). The four brake pads (6) are symmetrically arranged on the outer side walls of the two brake shoes (3). The brake wheel cylinder (7) is connected to the brake shoes (3) in a transmission manner.

4. The return spring plate of the drum brake according to claim 2, characterized in that: The two ends of the mounting base (12) are detachably fixed to the outer wall of the brake shoe (3) by mounting bolts (14).

5. The return spring plate of the drum brake according to claim 1, characterized in that: The return spring (8) is made of a high-elasticity alloy material, and the surface of the return spring (8) is provided with an anti-corrosion and wear-resistant coating.

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