Brake structure and vehicle

Abstract

This application provides a braking structure, including a brake drum mounted on a wheel and a transition mechanism mounted on a vehicle frame. The brake drum contains a rotating cam and friction pads. When the rotating cam rotates, it actuates the friction pads to contact the brake drum. The rotating cam is connected to a brake swing arm. The transition mechanism includes a drive shaft mounted on the vehicle frame. One end of the drive shaft is connected to a second transition swing arm, and the other end is connected to a first transition swing arm. The second transition swing arm is longer than the first transition swing arm, and the second transition swing arm is also connected to the brake swing arm. The first transition swing arm is connected to an output push rod. An air chamber mounted on the vehicle frame drives the output push rod to extend or retract. This application also includes a vehicle that includes the above-described braking structure.

Description

Technical Field

[0001] This application belongs to the field of vehicle braking technology, specifically relating to a braking structure and a vehicle including the braking structure. Background Technology

[0002] In related technologies, braking methods mainly include disc brakes and drum brakes. Drum brakes, in particular, achieve braking by having two brake shoes extend outwards to press against a rotating hollow disc.

[0003] Among them, pneumatic drive is a common technical means in the field for drum brakes. For example, Chinese invention patent CN210397514U discloses a pneumatic brake device, including a brake drum installed on the wheel and a brake disc installed on the frame. Two support shafts are installed on the outer side wall of the brake disc, and curved brake plates are rotatably installed on both support shafts. A connecting gear (rotation fulcrum) is fixedly installed on the end of the curved brake plate near the support shaft, and the two connecting gears mesh with each other. A rotating protrusion is arranged between the two curved brake plates. The end of the through shaft away from the rotating protrusion extends through the brake disc to the outside and is equipped with an eccentric wheel. The eccentric wheel is connected to a drive cylinder. The pneumatic drive cylinder can drive the eccentric wheel to rotate by extending the output rod. After the eccentric wheel rotates, it can drive the rotating protrusion to rotate through the through shaft. During the rotation of the rotating protrusion, it can simultaneously drive the two curved brake plates to rotate outward around the corresponding support shaft. The brake surface on the outer side of the curved brake plate presses against the inner side of the brake drum to generate braking.

[0004] In the aforementioned invention patent, the rotating protrusion needs to rotate at a certain angle to achieve the braking function. The rotating protrusion rotates by extending the output rod of the driving cylinder. However, when there is air leakage in the cylinder or insufficient air pressure due to other reasons, the output rod may not extend long enough, resulting in the rotating protrusion not rotating properly and causing brake failure. Summary of the Invention

[0005] This application aims to solve the problem of brake failure caused by cylinder air pressure issues in the prior art, and adopts the following technical solution:

[0006] A braking structure includes a brake drum mounted on a wheel and a transition mechanism mounted on a vehicle frame;

[0007] The brake drum is equipped with a rotating cam and a friction plate. When the rotating cam rotates, it can push the friction plate to contact the brake drum. The rotating cam is connected to a brake swing arm.

[0008] The transition mechanism includes a drive shaft mounted on the frame, one end of which is connected to a second transition arm, and the other end of which is connected to a first transition arm. The second transition arm is longer than the first transition arm. The second transition arm is also connected to the brake arm. The first transition arm is connected to an output push rod. An air chamber is mounted on the frame to drive the output push rod to extend or retract.

[0009] Furthermore, the output push rod and the transition swing arm are connected by a pin;

[0010] Furthermore, the transition swing arm is fixedly connected to the transmission shaft;

[0011] Furthermore, the second transition swing arm is connected to the transmission shaft by a spline connection;

[0012] Furthermore, the transition swing arm 2 and the brake swing arm are connected by a pin.

[0013] Furthermore, a strip-shaped hole is provided at one end of the connection between the brake swing arm and the transition swing arm 2.

[0014] Furthermore, a rotating bearing is installed on the frame, and the drive shaft is fitted into the rotating bearing.

[0015] Furthermore, the rotating bearing is a needle roller bearing.

[0016] This application also includes a vehicle that includes the above-described braking structure.

[0017] The beneficial effects of this application are:

[0018] This application includes a transition mechanism that serves as a transmission mechanism. The length of the second transition arm is greater than that of the first transition arm, enabling the first transition arm to rotate a small distance while the output push rod extends a small distance. This allows the first transition arm to rotate a large distance, thereby enabling the brake arm and the rotary cam to rotate at large angles. This effectively avoids brake failure caused by insufficient air pressure in the air chamber leading to insufficient extension of the output push rod. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a braking structure according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the internal structure of a brake drum in a braking structure according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of a brake swing arm structure in a braking structure according to an embodiment of this application;

[0022] In the diagram: 1 Brake swing arm, 2 Air chamber, 3 Output push rod, 4 Transition swing arm one, 5 Transition swing arm two, 6 Drive shaft, 7 Rotary bearing, 8 Brake drum, 9 Flange, 10 Rotary cam, 11 Camshaft, 12 Support frame, 13 Friction plate, 14 Return spring, 15 Roller, 16 Frame. Detailed Implementation

[0023] To make the above-mentioned features and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] Reference Figure 1-3 This application provides a braking structure, including a brake drum 8 mounted on a wheel and a transition mechanism mounted on a frame 16;

[0025] The brake drum 8 is equipped with a rotating cam 10 and a friction plate 13. When the rotating cam 10 rotates, it can push the friction plate 13 to contact the brake drum 8. The rotating cam 10 is connected to a brake swing arm 1.

[0026] The transition mechanism includes a drive shaft 6 mounted on the frame 16. One end of the drive shaft 6 is connected to a second transition swing arm 5, and the other end of the drive shaft 6 is connected to a first transition swing arm 4. The length of the second transition swing arm 5 is greater than the length of the first transition swing arm 4. The second transition swing arm 5 is also connected to the brake swing arm 1. The first transition swing arm 4 is connected to an output push rod 3. An air chamber 2 is mounted on the frame 16 to drive the output push rod 3 to extend or retract.

[0027] Specifically, the brake drum 8 is bolted to a flange 9, on which two support frames 12 are mounted. One end of each support frame 12 is rotatably mounted on the flange 9, and the other end is fitted with a roller 15. Friction plates 13 are mounted on each of the two support frames 12, and a return spring 14 connects the two support frames 12. The rotating cam 10 is rotatably mounted on the flange 9 via a camshaft 11. When the rotating cam 10 rotates, it can push the two support frames 12 to rotate, causing the friction plates 13 to contact and rub against the brake drum 8, thereby generating braking force. In this application, when braking, the air chamber 2 drives the output push rod 3 to extend, causing the transition arm 4 to rotate. The transition arm 4 drives the transition arm 5 to rotate via the transmission shaft 6. The transition arm 5 drives the rotating cam 10 to rotate via the brake arm 1, thereby forming a brake. The length of the transition arm 5 is greater than the length of the transition arm 4. The transition arm 4 and the transition arm 5 rotate coaxially. When the transition arm 4 rotates a small distance, the transition arm 5 can rotate a large distance, thereby achieving a large angle rotation of the rotating cam 10. This effectively increases the output range of the output push rod 3. Even if the air chamber 2 has insufficient pressure, causing the output push rod 3 to not extend sufficiently, the rotating cam 10 can still be rotated to the correct position to achieve effective braking.

[0028] It should be understood that the insufficient air pressure mentioned in this application means that the air pressure in the air chamber 2 is insufficient to allow the output push rod 3 to extend to the original designed extension position. It should not be interpreted as the air chamber 2 completely losing air pressure, otherwise no braking action can be completed.

[0029] It is understood that the output push rod 3 and the transition swing arm 4 are connected by a pin.

[0030] It is understood that the transition swing arm 4 is fixedly connected to the transmission shaft 6. Specifically, the fixed connection may be welded.

[0031] It is understood that the transition swing arm 2 5 and the transmission shaft 6 are connected by a spline.

[0032] It is understood that the transition swing arm 2 5 and the brake swing arm 1 are connected by a pin.

[0033] It is understood that a strip-shaped hole is provided at one end of the connection between the brake swing arm 1 and the transition swing arm 2 5.

[0034] Specifically, the brake swing arm 1 and the transition swing arm 2 5 are connected by a pin, which passes through the strip hole. When the transition swing arm 2 5 drives the brake swing arm 1 to swing, the strip hole can effectively compensate for the distance change caused by the swing.

[0035] It is understood that a rotating bearing 7 is mounted on the frame 16, and the drive shaft 6 is fitted into the rotating bearing 7.

[0036] Furthermore, the rotating bearing 7 is a needle roller bearing.

[0037] This application also includes a vehicle that includes the above-described braking structure.

[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A braking structure, characterized in that, This includes the brake drums mounted on the wheels and the transition mechanism mounted on the frame; The brake drum is equipped with a rotating cam and a friction plate. When the rotating cam rotates, it can push the friction plate to contact the brake drum. The rotating cam is connected to a brake swing arm. The transition mechanism includes a drive shaft mounted on the frame, one end of which is connected to a second transition arm, and the other end of which is connected to a first transition arm. The second transition arm is longer than the first transition arm. The second transition arm is also connected to the brake arm. The first transition arm is connected to an output push rod. An air chamber is mounted on the frame to drive the output push rod to extend or retract.

2. The braking structure according to claim 1, characterized in that, The output push rod and the transition swing arm are connected by a pin.

3. The braking structure according to claim 1, characterized in that, The transition swing arm is fixedly connected to the transmission shaft.

4. The braking structure according to claim 1, characterized in that, The transition swing arm 2 is connected to the transmission shaft by a spline.

5. A braking structure according to claim 1, characterized in that, The transition swing arm 2 and the brake swing arm are connected by a pin.

6. A braking structure according to claim 1, characterized in that, A strip-shaped hole is provided at one end of the connection between the brake swing arm and the transition swing arm 2.

7. A braking structure according to any one of claims 1-6, characterized in that, A rotating bearing is installed on the frame, and the drive shaft is fitted into the rotating bearing.

8. A braking structure according to claim 7, characterized in that, The rotating bearing is a needle roller bearing.

9. A vehicle, characterized in that, Includes the braking structure as described in claim 8.

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