A fixed seat structure for drum brake of automobile

Abstract

The utility model relates to the technical field of automobile brake equipment discloses a kind of automobile drum brake fixed seat structure, including backplate, two fixed shafts are fixedly arranged in backplate inner wall lower end, limit plate is fixedly arranged in the fixed shaft outer wall, connecting plate is fixedly arranged in the limit plate one side, brake shoe is rotatably arranged in the connecting plate one side both ends, two brake shoes one side fixedly arranged have friction lining, two friction linings one side fixedly arranged have friction plate, two brake shoes one side fixedly connected have piston, brake drum cylinder is fixedly arranged in the piston outer wall, connecting block is fixedly arranged in the brake drum cylinder one side both ends. In the utility model, brake drum cylinder is firmly fixed by connecting block, and is closely matched with clamping plate in the hole of backplate, to ensure that brake drum cylinder position is stable. Meanwhile, three fixed blocks are used to fix brake shoe at multiple points, which can effectively resist impact and friction reaction force generated during braking.

Description

Technical Field

[0001] This utility model relates to the field of automotive braking equipment technology, and in particular to a structure for a mounting bracket for an automotive drum brake. Background Technology

[0002] The drum brake mounting structure is widely used in the braking systems of heavy-duty vehicles and automobiles. It needs to withstand the high-intensity impact and frictional reaction force during braking, providing a stable mounting base for its core components. In the rear wheel braking systems of economy cars, its low cost and easy processing characteristics can balance manufacturing costs and basic braking requirements, making it suitable for daily commuting on urban roads. It is especially suitable for models with compact braking system space requirements and is a key structure to ensure the orderly operation of drum brake components.

[0003] However, the current shortcomings are quite significant. Maintenance requires disassembling the mounting bracket to inspect internal components, which is cumbersome and affects maintenance efficiency.

[0004] Therefore, this application provides a structure for mounting a drum brake for automobiles to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a new automotive drum brake mounting structure that is easy to install and has a clear structure.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A drum brake mounting structure for automobiles includes a back plate. Two fixed shafts are fixedly mounted on the lower end of the inner wall of the back plate. A limiting plate is fixedly mounted on the outer wall of the fixed shafts. A connecting plate is fixedly mounted on one side of the limiting plate. Brake shoes are rotatably mounted on both ends of one side of the connecting plate. Friction linings are fixedly mounted on one side of the two brake shoes. Friction pads are fixedly mounted on one side of the two friction linings. A piston is fixedly connected to one side of the two brake shoes. Brake wheel cylinders are fixedly mounted on the outer walls of the two pistons. Connecting blocks are fixedly mounted on both ends of one side of the brake wheel cylinders. Clamping plates are fixedly mounted on both ends of one side of the two connecting blocks.

[0008] Furthermore, a fluid injection pipe is fixedly installed in the middle of one side of the brake wheel cylinder, and a fixing ring is fixedly installed on the outer wall of the fluid injection pipe.

[0009] Furthermore, a connecting seat is fixedly provided on one side of the inner wall of the back plate, a first rotating shaft is rotatably provided on the inner wall of the connecting seat, a fixing screw is threaded on one side of the connecting seat, and a fixing bolt is threaded on one end of the fixing screw.

[0010] Furthermore, a locating pin spring is fixedly installed on one side of each of the two brake shoes.

[0011] Furthermore, a first return spring is connected to both sides of the upper end of the two brake shoes, and a second return spring is connected to both sides of the lower end of the two brake shoes.

[0012] Furthermore, three second rotating shafts are fixedly installed at one end of the two fixed shafts, and a fixed block is rotatably installed at one end of the outer wall of the three second rotating shafts, and a locking block is fixedly installed on the inner side of the fixed block.

[0013] Furthermore, three sliding grooves are provided at one end of each of the two fixed shafts.

[0014] This utility model has the following beneficial effects:

[0015] 1. This utility model proposes a drum brake mounting structure for automobiles. The brake wheel cylinder is fixed by a connecting block, and a locking plate engages with the cylinder within a hole in the back plate. This securely locks the brake wheel cylinder in place, preventing component displacement due to vibration during braking and ensuring stable operation of the braking system. It is adaptable to the braking requirements of different vehicle models. Furthermore, disassembly requires no tools; the brake wheel cylinder can be removed simply by squeezing the locking plate. This significantly simplifies the disassembly process, shortens the time required for inspection, repair, or component replacement, reduces the hassle of manually unscrewing traditional bolts, and improves maintenance efficiency.

[0016] 2. This utility model proposes a multi-point fixing structure for automotive drum brakes, using three fixing blocks to fix the brake shoes. Compared to single-point fixing, this provides more even force distribution, effectively resisting the impact and frictional reaction forces during braking, preventing overall misalignment of the brake shoes, and ensuring precise contact between the friction lining and the backing plate, making it suitable for high-frequency braking scenarios. Simultaneously, the inclined arc-shaped sliding groove on the fixing shaft, combined with the end groove design, allows for easy installation by simply rotating the fixing block, causing the locking block to slide along the groove and engage with the groove. Furthermore, the inclined arc-shaped sliding groove facilitates the sliding of the fixing block, eliminating the need for complex alignment or tool assistance, simplifying the installation process, solving the problems of difficult and time-consuming alignment in traditional fixing methods, improving assembly efficiency, and reducing installation difficulty during production and maintenance. Attached Figure Description

[0017] Figure 1 This is an axonometric schematic diagram of the automotive drum brake mounting structure of this utility model;

[0018] Figure 2 This is a schematic axial sectional view of the automotive drum brake mounting structure of this utility model;

[0019] Figure 3 This is an enlarged schematic diagram of section A of the automotive drum brake mounting structure of this utility model;

[0020] Figure 4 This is a schematic axial sectional view of the fixed shaft mechanism of the automotive drum brake mounting structure of this utility model.

[0021] Legend:

[0022] 1. Back plate; 2. Friction lining; 3. Friction pad; 4. Locating pin spring; 5. Brake wheel cylinder; 6. Piston; 7. First return spring; 8. Fixing screw; 9. Connecting seat; 10. Second return spring; 11. Brake shoe; 12. Connecting plate; 13. First rotating shaft; 14. Connecting block; 15. Clamping plate; 16. Fixing ring; 17. Injection pipe; 18. Fixing bolt; 19. Slide groove; 20. Second rotating shaft; 21. Fixing block; 22. Limiting plate; 23. Clamping block; 24. Fixing shaft. Detailed Implementation

[0023] 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.

[0024] Reference Figure 1 , Figure 2 , Figure 4 One embodiment provided by this utility model:

[0025] A drum brake mounting structure for automobiles includes a back plate 1. Two fixed shafts 24 are fixedly installed on the lower end of the inner wall of the back plate 1. A limiting plate 22 is fixedly installed on the outer wall of the fixed shafts 24. A connecting plate 12 is fixedly installed on one side of the limiting plate 22. Brake shoes 11 are rotatably installed at both ends of one side of the connecting plate 12. Friction linings 2 are fixedly installed on one side of the two brake shoes 11. Friction pads 3 are fixedly installed on one side of the two friction linings 2. A piston 6 is fixedly connected to one side of the two brake shoes 11. Brake wheel cylinders 5 are fixedly installed on the outer wall of the two pistons 6. Connecting blocks 14 are fixedly installed at both ends of one side of the brake wheel cylinders 5. Clamping plates 15 are fixedly installed at both ends of one side of the two connecting blocks 14.

[0026] Specifically, the back plate 1 is the basic support component of the entire fixed base structure, used to install all components and provide a stable mounting carrier for the braking system; the fixed shaft 24 is vertically fixed to the inner wall of the back plate 1, providing an installation reference for the limiting plate 22 and the connecting plate 12, ensuring structural stability; the limiting plate 22 is fitted onto the outer wall of the fixed shaft 24, restricting the lateral position of the connecting plate 12 and preventing displacement; the connecting plate 12 is welded to one side of the limiting plate 22, and its end is rotatably connected to the brake shoe 11, providing a rotation fulcrum for the brake shoe 11, facilitating flexible opening and closing; the brake shoe 11 has an arc-shaped structure and can rotate around the fixed shaft 24, causing the friction components to conform to the external brake drum (not shown in the figure). The friction lining 2 is made of nitrile rubber and is bonded between the brake shoe 11 and the friction pad 3 to buffer frictional impact and reduce component wear. The friction pad 3 is a semi-metallic friction material that contacts the inner wall of the external brake drum during braking and decelerates the vehicle through friction. The piston 6 is made of aluminum alloy and is embedded in the brake wheel cylinder 5. It is hydraulically driven to open the brake shoe 11. The brake wheel cylinder 5 adopts a double-piston design to provide hydraulic power to the piston 6. The connecting block 14 is symmetrically fixed on both sides of the brake wheel cylinder 5. The clamping plate 15 is made of 65Mn spring steel and can be inserted into the preset hole of the back plate 1 to firmly fix the brake wheel cylinder 5 on the back plate 1 and prevent vibration and displacement during braking.

[0027] Reference Figure 2 A fluid injection pipe 17 is fixedly installed in the middle of one side of the brake wheel cylinder 5, and a fixing ring 16 is fixedly installed on the outer wall of the fluid injection pipe 17.

[0028] Specifically, the injection pipe 17 is a brass conduit, with one end connected to the inside of the brake wheel cylinder 5 and the other end connected to the vehicle's brake line. It is used to inject brake fluid into the brake wheel cylinder 5 to provide a medium for hydraulic braking. The fixing ring 16 is a ring-shaped metal part, which is welded to the connection between the injection pipe 17 and the back plate 1 to enhance the interface strength between the injection pipe 17 and the brake wheel cylinder 5, prevent the injection pipe 17 from falling off or leaking under high pressure of brake fluid, and ensure stable brake hydraulic pressure.

[0029] Reference Figure 1 , Figure 2 A connecting seat 9 is fixedly installed on one side of the inner wall of the back plate 1. A first rotating shaft 13 is rotatably installed on the inner wall of the connecting seat 9. A fixing screw 8 is threaded on one side of the connecting seat 9, and a fixing bolt 18 is threaded on one end of the fixing screw 8.

[0030] Specifically, the connecting seat 9 is a block-shaped metal component used to install the first rotating shaft 13; the first rotating shaft 13 is a cylindrical metal shaft that can rotate freely within the connecting seat 9, and one end of it is adapted to the rotating shaft assembly of the brake drum to transmit the rotational torque of the brake drum and ensure the stable rotation of the brake drum. The fixing screw 8 and the fixing bolt 18 cooperate to tighten from the outside of the connecting seat 9, firmly locking the connecting seat 9 onto the back plate 1 to prevent the connecting seat 9 from loosening during braking and to ensure the support stability of the first rotating shaft 13.

[0031] Reference Figure 1 The two brake shoes 11 are fixedly equipped with positioning pin springs 4 on one side.

[0032] Specifically, the positioning pin spring 4 is a compression spring, with one end fixed in the preset mounting hole of the brake shoe 11 and the other end extending to the preset contact point of the external brake drum (not marked in the figure). It maintains slight contact with the brake drum through the elastic force of the spring itself. Its core function is to limit the radial displacement of the brake shoe 11, prevent the brake shoe 11 from tilting and shaking due to vehicle bumps in the non-braking state, ensure that the gap between the friction pad 3 and the inner wall of the brake drum is uniform, and avoid unilateral friction or excessive gap affecting the braking effect.

[0033] Reference Figure 1 The upper ends of the two brake shoes 11 are connected to the first return spring 7, and the lower ends of the two brake shoes 11 are connected to the second return spring 10.

[0034] Specifically, both the first return spring 7 and the second return spring 10 are stainless steel tension springs, each with hooks at both ends: the two ends of the first return spring 7 are hooked into the upper preset holes of the two brake shoes 11, and the two ends of the second return spring 10 are hooked into the lower preset holes of the two brake shoes 11. During braking, the brake shoes 11 open to both sides, and the springs are stretched and stored. After braking, the springs pull the two brake shoes 11 back to the center through their own elasticity, so that the friction pads 3 are completely separated from the inner wall of the brake drum, avoiding continuous friction and wear, while ensuring that the brake shoes 11 are in contact with the piston 6 and return to their initial position, preparing for the next braking.

[0035] Reference Figure 3 , Figure 4 Two fixed shafts 24 are fixedly provided with three second rotating shafts 20 at one end. A fixed block 21 is rotatably provided at one end of the outer wall of the three second rotating shafts 20. A locking block 23 is fixedly provided on the inner side of the fixed block 21.

[0036] Specifically, the second rotating shaft 20 is a short cylindrical shaft, welded to the end of the fixed shaft 24 near the brake shoe 11, providing a fulcrum for the fixed block 21 to rotate; the fixed block 21 is a metal block that can rotate around the second rotating shaft 20. After rotation, it can fit against the outer wall of the brake shoe 11, providing multi-point support and fixation for the brake shoe 11, resisting the impact and friction reaction force generated during braking, and preventing the brake shoe 11 from deforming or shifting; the locking block 23 is a protruding metal block, fixed inside the fixed block 21, used to lock into the groove 19 of the fixed shaft 24, locking the position of the fixed block 21 and preventing it from rotating during braking.

[0037] Reference Figure 3 , Figure 4 The two fixed shafts 24 have three sliding grooves 19 at one end.

[0038] Specifically, the slide groove 19 is an arc-shaped groove opened at the end of the fixed shaft 24, which is adapted to the size of the locking block 23 of the fixed block 21: during installation, the fixed block 21 is rotated so that the locking block 23 slides along the slide groove 19 to the bottom of the groove, and the locking block 23 can be locked in the slide groove 19, completing the quick positioning of the fixed block 21; the arc design of the slide groove 19 facilitates the sliding of the locking block 23 without the need for precise alignment, simplifying the installation process; at the same time, the slide groove 19 can limit the movement range of the locking block 23, ensuring that the fixed block 21 accurately supports the brake shoe 11.

[0039] Working principle: When the driver presses the brake pedal, the vehicle's master cylinder generates high-pressure brake fluid, which enters the brake wheel cylinder 5 through the injection pipe 17. The high-pressure brake fluid pushes the piston 6 to extend to both sides, and the piston 6 pushes the brake shoe 11 to rotate around the connecting plate 12 and open to both sides. During this process, the return spring is stretched and stored. The brake shoe 11 drives the friction pad 3 to adhere to the inner wall of the brake drum, and the friction force resists the rotation of the brake drum, thereby slowing down or stopping the vehicle.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure for mounting a drum brake for automobiles, comprising a back plate (1), characterized in that: Two fixed shafts (24) are fixedly installed at the lower end of the inner wall of the back plate (1). A limit plate (22) is fixedly installed on the outer wall of the fixed shaft (24). A connecting plate (12) is fixedly installed on one side of the limit plate (22). Brake shoes (11) are rotatably installed at both ends of one side of the connecting plate (12). Friction linings (2) are fixedly installed on one side of the two brake shoes (11). Friction plates (3) are fixedly installed on one side of the two friction linings (2). A piston (6) is fixedly connected to one side of the two brake shoes (11). A brake wheel cylinder (5) is fixedly installed on the outer wall of the two pistons (6). A connecting block (14) is fixedly installed at both ends of one side of the brake wheel cylinder (5). A clamping plate (15) is fixedly installed at both ends of one side of the two connecting blocks (14).

2. The automotive drum brake mounting structure according to claim 1, characterized in that: A liquid injection pipe (17) is fixedly installed in the middle of one side of the brake wheel cylinder (5), and a fixing ring (16) is fixedly installed on the outer wall of the liquid injection pipe (17).

3. The automotive drum brake mounting structure according to claim 1, characterized in that: A connecting seat (9) is fixedly provided on one side of the inner wall of the back plate (1). A first rotating shaft (13) is rotatably provided on the inner wall of the connecting seat (9). A fixing screw (8) is threaded on one side of the connecting seat (9). A fixing bolt (18) is threaded on one end of the fixing screw (8).

4. The automotive drum brake mounting structure according to claim 1, characterized in that: A positioning pin spring (4) is fixedly installed on one side of each of the two brake shoes (11).

5. The automotive drum brake mounting structure according to claim 1, characterized in that: The upper ends of the two brake shoes (11) are connected to a first return spring (7), and the lower ends of the two brake shoes (11) are connected to a second return spring (10).

6. The automotive drum brake mounting structure according to claim 1, characterized in that: Three second rotating shafts (20) are fixedly installed at one end of the two fixed shafts (24), and a fixed block (21) is rotatably installed at one end of the outer wall of the three second rotating shafts (20). A locking block (23) is fixedly installed on the inner side of the fixed block (21).

7. The automotive drum brake mounting structure according to claim 1, characterized in that: Three grooves (19) are provided at one end of each of the two fixed shafts (24).

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