Drum brake for automobile

Abstract

The utility model relates to the technical field of drum brakes, and discloses a drum brake for an automobile, which comprises a brake bottom plate and a brake drum, brake shoes are rotatably mounted on the left side and the right side of the front end of the brake bottom plate, a hub is rotatably mounted at the axis of the brake bottom plate, and the brake drum is fixed outside the hub through bolts; the inner ring is fixed to the inner axis of the brake drum through a screw, and fan blades evenly distributed in the annular direction are installed on the outer portion of the inner ring; the heat conducting plate is fixed to the inner side of the brake shoe through screws, and heat conducting fins are integrally formed on the inner side of the heat conducting plate; the second air guide groove is annularly formed in the side, close to the fan blades, of the outer portion of the brake drum, and the first air guide groove is formed in one side of the lower end face of the interior of the brake bottom plate. The heat conduction fins are arranged on the inner sides of the brake shoes and matched with the fan blades on the inner side of the brake drum, the fan blades rotate to generate airflow so as to dissipate heat of the brake shoes, and the brake performance is prevented from being affected by high temperature.

Description

Technical Field

[0001] This utility model relates to the field of drum brake technology, specifically to drum brakes for automobiles. Background Technology

[0002] In automotive braking systems, drum brakes are widely used in many vehicles due to their simple structure, low cost, and large braking torque. Traditional automotive drum brakes mainly consist of components such as brake backing plate, brake shoes, brake drum, and wheel hub. During operation, the friction between the brake shoes and the brake drum is used to decelerate or stop the vehicle.

[0003] However, existing automotive drum brakes have significant drawbacks in practical use. When a vehicle brakes frequently or for extended periods, the large amount of heat generated by the friction between the brake shoes and the brake drum is difficult to dissipate quickly, causing the temperature of the brake drum and brake shoes to rise sharply. High temperatures not only degrade the performance of the brake friction materials and reduce braking efficiency, but may also lead to serious safety hazards such as brake failure. At the same time, the thermal expansion caused by high temperatures can cause changes in the brake clearance, affecting the stability and reliability of braking. In addition, traditional drum brakes lack effective heat dissipation structures and rely solely on natural heat dissipation, which cannot meet the heat dissipation requirements of vehicles under complex operating conditions. Therefore, automotive drum brakes have been proposed. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a drum brake for automobiles to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a drum brake for automobiles, comprising:

[0006] The brake base plate and brake drum are provided. Brake shoes are rotatably mounted on both the left and right sides of the front end of the brake base plate. A wheel hub is rotatably mounted at the axis of the brake base plate. The brake drum is fixed to the outside of the wheel hub by bolts.

[0007] The inner ring is fixed to the inner axis of the brake drum by screws, and fan blades are evenly distributed along the ring on the outside of the inner ring.

[0008] A heat-conducting plate is fixed to the inner side of the brake shoe by screws, and heat-conducting fins are integrally formed on the inner side of the heat-conducting plate.

[0009] The second air guide groove is circumferentially formed on the outside of the brake drum near the fan blade, and the first air guide groove is formed on the lower inner surface of the brake base plate.

[0010] Preferably, the first air guide channel is integrally formed with the brake base plate, and a first dustproof ventilation net is installed inside the first air guide channel, and the first dustproof ventilation net is fixed to the first air guide channel by screws.

[0011] Preferably, the second air guide groove is integrally formed with the brake drum, and a second dustproof ventilation mesh is installed inside the second air guide groove, and the second dustproof ventilation mesh is fixed to the second air guide groove by screws.

[0012] Preferably, a return spring is provided on the upper front side of the brake shoe, and the return spring is fixedly connected to the brake shoe.

[0013] Preferably, a brake wheel cylinder is provided on the upper front side of the brake base plate, and the brake wheel cylinder is positioned between the two brake shoes.

[0014] Preferably, the inner diameter of the inner ring is larger than the outer diameter of the hub, and the fan blade is fixedly connected to the inner ring.

[0015] Compared with the prior art, this utility model provides a drum brake for automobiles, which has the following advantages:

[0016] This invention provides a heat-conducting plate on the inner side of the brake shoe, which facilitates heat conduction. Combined with heat-conducting fins on the inner side of the plate, the heat dissipation efficiency is improved by increasing the contact area with the surrounding medium. Furthermore, fan blades mounted on the inner ring of the brake drum generate airflow as the drum rotates. This airflow passes through the heat-conducting fins and is then discharged, thus dissipating heat from the brake shoe and brake drum and preventing heat from affecting braking performance. Attached Figure Description

[0017] Figure 1 This is a perspective view of the overall structure of this utility model;

[0018] Figure 2 This is a three-dimensional view of the brake base plate structure of this utility model;

[0019] Figure 3 This is a three-dimensional view of the internal structure of the brake drum of this utility model.

[0020] In the diagram: 1. Brake base plate; 2. Brake shoe; 3. Brake wheel cylinder; 4. Heat-conducting plate; 5. Heat-conducting fins; 6. Return spring; 7. Wheel hub; 8. First air guide groove; 9. First dustproof ventilation mesh; 10. Brake drum; 11. Inner ring; 12. Fan blade; 13. Second air guide groove; 14. Second dustproof ventilation mesh. Detailed Implementation

[0021] 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.

[0022] This utility model provides a technical solution: a drum brake for automobiles. Please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 ,include:

[0023] Brake base plate 1 and brake drum 10, brake shoes 2 are rotatably mounted on both the left and right sides of the front end of brake base plate 1, wheel hub 7 is rotatably mounted at the axis of brake base plate 1, and brake drum 10 is fixed to the outside of wheel hub 7 by bolts.

[0024] The inner ring 11 is fixed to the inner shaft of the brake drum 10 by screws, and the outer side of the inner ring 11 is equipped with fan blades 12 that are evenly distributed along the ring.

[0025] The heat-conducting plate 4 is fixed to the inner side of the brake shoe 2 by screws, and the inner side of the heat-conducting plate 4 is integrally formed with heat-conducting fins 5.

[0026] The second air guide groove 13 is circumferentially opened on the side of the brake drum 10 near the fan blade 12, and the first air guide groove 8 is opened on the lower inner surface of the brake base plate 1.

[0027] Please see Figure 2 The first air guide slot 8 is integrally formed with the brake base plate 1. The first dustproof ventilation net 9 is installed inside the first air guide slot 8, and the first dustproof ventilation net 9 is fixed to the first air guide slot 8 by screws. The first dustproof ventilation net 9 is used to provide dustproof ventilation for the first air guide slot 8.

[0028] Please see Figure 1 and Figure 3 The second air guide slot 13 is integrally formed with the brake drum 10. The second dustproof ventilation net 14 is installed inside the second air guide slot 13, and the second dustproof ventilation net 14 is fixed to the second air guide slot 13 by screws. The second dustproof ventilation net 14 is used to provide dustproof ventilation for the second air guide slot 13.

[0029] Please see Figure 2 A return spring 6 is provided on the upper front side of the brake shoe 2, and the return spring 6 is fixedly connected to the brake shoe 2. The return spring 6 enables the brake shoe 2 to automatically reset.

[0030] Please see Figure 2 A brake wheel cylinder 3 is provided on the upper front side of the brake base plate 1, and the brake wheel cylinder 3 is positioned between the two brake shoes 2. The brake wheel cylinder 3 is used to push out the brake shoes 2.

[0031] Please see Figure 2 and Figure 3 The inner diameter of the inner ring 11 is larger than the outer diameter of the hub 7, and the fan blade 12 is fixedly connected to the inner ring 11.

[0032] In this design, the brake drum 10 is fixed to the wheel hub 7 with bolts. When the brake pedal is pressed, the brake wheel cylinder 3 is controlled by the braking system to lift the brake shoe 2. The brake shoe 2 and the inner wall of the brake drum 10 are in contact and rub against each other to brake.

[0033] Under the action of friction, the brake shoe 2 and the brake drum 10 convert mechanical energy into heat energy. The heat energy is transferred to the heat-conducting fins 5 through the heat-conducting plate 4. The heat-conducting fins 5 diffuse the heat-conducting area. When the brake drum 10 rotates, the inner ring 11 drives the fan blades 12 to rotate. The rotation of the fan blades 12 generates airflow, which in turn allows the outside air to pass through the first air guide groove 8 into the space between the brake base plate 1 and the brake drum 10 and then through the second air guide groove 13 to be discharged, thereby carrying away the heat at the heat-conducting fins 5.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drum brake for automobiles, characterized in that, include: Brake base plate (1) and brake drum (10), brake shoes (2) are rotatably installed on both the left and right sides of the front end of the brake base plate (1), and a wheel hub (7) is rotatably installed at the axis of the brake base plate (1). The brake drum (10) is fixed to the outside of the wheel hub (7) by bolts. The inner ring (11) is fixed to the inner axis of the brake drum (10) by screws, and the outer side of the inner ring (11) is equipped with fan blades (12) evenly distributed along the ring. The heat-conducting plate (4) is fixed to the inner side of the brake shoe (2) by screws. The inner side of the heat-conducting plate (4) is integrally formed with heat-conducting fins (5). The second air guide groove (13) is opened in a ring on the side of the brake drum (10) near the fan blade (12), and the first air guide groove (8) is opened on the lower inner surface of the brake base plate (1).

2. The automotive drum brake according to claim 1, characterized in that: The first air guide groove (8) is integrally formed with the brake base plate (1). The first dustproof ventilation mesh (9) is installed inside the first air guide groove (8), and the first dustproof ventilation mesh (9) is fixed to the first air guide groove (8) by screws.

3. The automotive drum brake according to claim 1, characterized in that: The second air guide groove (13) is integrally formed with the brake drum (10). The second dustproof ventilation mesh (14) is installed inside the second air guide groove (13), and the second dustproof ventilation mesh (14) is fixed to the second air guide groove (13) by screws.

4. The automotive drum brake according to claim 1, characterized in that: A return spring (6) is provided on the upper front side of the brake shoe (2), and the return spring (6) is fixedly connected to the brake shoe (2).

5. The automotive drum brake according to claim 1, characterized in that: A brake wheel cylinder (3) is provided on the upper front side of the brake base plate (1), and the brake wheel cylinder (3) is located between the two brake shoes (2).

6. The automotive drum brake according to claim 1, characterized in that: The inner diameter of the inner ring (11) is larger than the outer diameter of the hub (7), and the fan blade (12) is fixedly connected to the inner ring (11).

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