Self-energizing drum brake

Abstract

The utility model relates to the technical field of drum brakes, and discloses a self-energizing drum brake which comprises a back plate, a connecting hole is formed in the back plate, the back plate is fixedly connected with a transmission shaft through the connecting hole, a brake drum is detachably installed on the back plate, a first pin rod is fixedly installed on the front side of the back plate, and a first brake shoe is rotatably installed on the first pin rod. The brake device has the advantages that the bottom ends of the first brake shoe and the second brake shoe can be controlled to be far away from each other, the two brake pads abut against the brake drum, the braking purpose is achieved, the L-shaped connecting rod can be controlled to rotate through unfolding of the first brake shoe, then the top supporting rod is driven to push the second brake shoe to be tightly attached to the brake drum, and braking is achieved. The extrusion force of the brake pad on the brake drum is enhanced, the contact area of the brake pad and the brake drum is increased, the brake force is enhanced, meanwhile, the abrasion of the brake pad is more uniform, and the service life of the brake pad is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of drum brakes, in particular to a self-energizing drum brake. Background Art

[0002] A drum brake consists of a brake drum, a support plate positioned within the drum, and a pair of brake shoes with friction linings. One end of each brake shoe is connected to a support pin inserted into a pinhole in the support plate. The other end of each brake shoe rests against an actuator, which drives the two brake shoes to rotate outward around the support pin and press against the inner cylindrical surface of the brake drum, generating braking force. However, existing drum brakes often suffer from insufficient braking force. While increasing the driving force of the actuator is the most direct solution, this requires high technical requirements and significantly increases the cost of the drum brake.

[0003] Therefore, it is necessary to design a self-energizing drum brake that can improve braking force without significantly increasing production costs. Utility Model Content

[0004] The purpose of the utility model is to provide a self-energizing drum brake, which has the effect of improving the braking force without significantly increasing the production cost.

[0005] The above-mentioned technical purpose of the present utility model is achieved through the following technical solutions: a self-amplifying drum brake, comprising a back plate, a connecting hole is opened on the back plate, the back plate is fixedly connected to the transmission shaft through the connecting hole, a brake drum is detachably mounted on the back plate, a first pin is fixedly mounted on the front side of the back plate, a first brake shoe is rotatably mounted on the first pin, a second pin is slidably mounted on the front side of the back plate, a second brake shoe is rotatably mounted on the second pin, brake pads are fixedly mounted on the first brake shoe and the second brake shoe, an actuating mechanism for controlling the two brake pads to conflict with the brake drum is provided on the back plate, and a top support assembly for controlling the first brake shoe and the second brake shoe to move away from each other is also provided on the back plate.

[0006] By adopting the above technical solution, the two brake pads can be controlled to move away from each other and conflict with the brake drum when braking is required, and the friction force is used to achieve the purpose of braking. The second brake shoe is pushed close to the brake drum through the top support rod, so that the squeezing force of the brake pad on the brake drum is enhanced, and the contact area between the brake pad and the brake drum is increased. While enhancing the braking force, the wear of the brake pad is more even, thereby increasing the service life of the brake pad.

[0007] The utility model is further configured as follows: the actuating mechanism includes a motor and a cam, the motor is fixedly mounted on the front side of the back plate and is located below the connecting hole, the cam is fixedly mounted on the output shaft end of the motor and is located between the first brake shoe and the second brake shoe, and the cam is in sliding contact with the first brake shoe and the second brake shoe respectively.

[0008] By adopting the above technical solution, the cam can be controlled to rotate, thereby controlling the bottom ends of the first brake shoe and the second brake shoe to move away from each other, so that the two brake pads come into contact with the brake drum, thereby achieving the purpose of braking.

[0009] The present invention is further configured as follows: a mounting tube is fixedly installed in the connecting hole, and a plurality of mounting holes that are evenly distributed are opened on the mounting tube.

[0010] By adopting the above technical solution, the back plate and the transmission shaft can be conveniently connected and fixed.

[0011] The present invention is further configured as follows: a first through hole is provided on each of the first brake shoe and the second brake shoe, the two first through holes are both located above the connecting hole and are symmetrically distributed, and a first return spring is provided in the two first through holes.

[0012] By adopting the above technical solution, the second pin rod can be controlled to return to the initial position after braking is completed.

[0013] The present invention is further configured as follows: a second through hole is provided on each of the first brake shoe and the second brake shoe, the two second through holes are both located below the connecting hole and are symmetrically distributed, and a second return spring is provided in the two second through holes.

[0014] By adopting the above technical solution, the second brake shoe can be controlled to return to the initial position after braking is completed.

[0015] The present invention is further configured as follows: the top support assembly includes a first support rod, an L-shaped connecting rod, a second support rod, a third support rod and a top support rod, the first support rod is fixedly mounted on the front side of the back plate and is located on the left side of the connecting hole, the L-shaped connecting rod is rotatably mounted on the first support rod and is located in front of the first brake shoe, the second support rod is fixedly mounted on the first brake shoe and is slidably connected to the L-shaped connecting rod, the third support rod is fixedly mounted on the second brake shoe, the top support rod is rotatably mounted on the third support rod, and the end of the top support rod away from the third support rod is rotatably connected to the L-shaped connecting rod.

[0016] By adopting the above technical solution, the expansion of the first brake shoe can be used to control the rotation of the L-shaped connecting rod, thereby driving the top support rod to push the second brake shoe close to the brake drum, thereby enhancing the squeezing force of the brake pad on the brake drum and increasing the contact area between the brake pad and the brake drum.

[0017] The present invention is further configured as follows: a telescopic hole is provided on the L-shaped connecting rod, and the second supporting rod is slidably installed in the telescopic hole.

[0018] By adopting the above technical solution, the L-shaped connecting rod can be easily rotated, thereby avoiding conflict between the rotation of the L-shaped connecting rod and the first brake shoe.

[0019] The utility model is further configured as follows: an adjustment slot is provided on the front side of the back plate and is located on the right side of the first pin rod; the rear end of the second pin rod is slidably installed in the adjustment slot.

[0020] By adopting the above technical solution, the second pin rod can be easily moved left and right.

[0021] The utility model is further configured as follows: two limiting grooves are provided on the front side of the back plate; limiting rods are fixedly mounted on the first brake shoe and the second brake shoe; and rear ends of the two limiting rods are respectively slidably mounted in the two limiting grooves.

[0022] By adopting the above technical solution, the rotation range of the first brake shoe and the second brake shoe can be limited.

[0023] The present invention is further configured as follows: a temperature sensor is fixedly mounted on the front side of the back plate.

[0024] By adopting the above technical solution, the temperature of the brake drum can be detected, thereby reducing the probability of accidents.

[0025] The beneficial effects of the utility model are:

[0026] 1. The utility model utilizes an actuating mechanism composed of a motor and a cam to control the bottom ends of the first brake shoe and the second brake shoe to move away from each other, so that the two brake pads come into contact with the brake drum, thereby achieving the purpose of braking.

[0027] 2. The utility model utilizes a top support assembly consisting of a first support rod, an L-shaped connecting rod, a second support rod, a third support rod and a top support rod. It can utilize the expansion of the first brake shoe to control the rotation of the L-shaped connecting rod, thereby driving the top support rod to push the second brake shoe close to the brake drum, thereby enhancing the squeezing force of the brake pad on the brake drum and increasing the contact area between the brake pad and the brake drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0030] Figure 2 It is a schematic diagram of the main cross-sectional structure of this embodiment.

[0031] Figure 3It is a schematic diagram of the three-dimensional structure of the top support assembly.

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the back panel.

[0033] In the figure, 1. back plate; 2. connecting hole; 3. brake drum; 4. first pin rod; 5. first brake shoe; 6. second pin rod; 7. second brake shoe; 8. brake pad; 9. motor; 10. cam; 11. mounting tube; 12. first through hole; 13. first return spring; 14. second through hole; 15. second return spring; 16. first support rod; 17. L-shaped connecting rod; 18. second support rod; 19. third support rod; 20. top support rod; 21. telescopic hole; 22. adjustment slot; 23. limit slot; 24. limit rod; 25. temperature sensor. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0035] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The utility model provides a self-amplifying drum brake, including a back plate 1, a connecting hole 2 is opened on the back plate 1, a mounting tube 11 is fixedly installed in the connecting hole 2, a plurality of evenly distributed mounting holes are opened on the mounting tube 11, which can be conveniently connected and fixed with the drive shaft through the mounting tube 11, the back plate 1 is fixedly connected to the drive shaft through the connecting hole 2, a brake drum 3 is detachably mounted on the back plate 1, a first pin rod 4 is fixedly mounted on the front side of the back plate 1, a first brake shoe 5 is rotatably mounted on the first pin rod 4, a second pin rod 6 is slidably mounted on the front side of the back plate 1, a second brake shoe 7 is rotatably mounted on the second pin rod 6, a brake pad 8 is fixedly mounted on the first brake shoe 5 and the second brake shoe 7, an actuating mechanism for controlling the two brake pads 8 to conflict with the brake drum 3 is provided on the back plate 1, and a top support assembly for controlling the first brake shoe 5 and the second brake shoe 7 to move away from each other is also provided on the back plate 1.

[0036] Specifically, the actuating mechanism includes a motor 9 and a cam 10. The motor 9 is fixedly mounted on the front side of the back plate 1 and is located below the connecting hole 2. It should be noted that the motor 9 is a forward and reverse rotating motor. The cam 10 is fixedly mounted on the output shaft end of the motor 9 and is located between the first brake shoe 5 and the second brake shoe 7. The cam 10 is in sliding contact with the first brake shoe 5 and the second brake shoe 7 respectively.

[0037] Specifically, a first through hole 12 is provided on the first brake shoe 5 and the second brake shoe 7, and the two first through holes 12 are both located above the connecting hole 2 and are symmetrically distributed. A first return spring 13 is provided in the two first through holes 12. A second through hole 14 is provided on the first brake shoe 5 and the second brake shoe 7, and the two second through holes 14 are both located below the connecting hole 2 and are symmetrically distributed. A second return spring 15 is provided in the two second through holes 14. By utilizing the first return spring 13 and the second return spring 15, the first brake shoe 5 and the second brake shoe 7 can be controlled to move away from the brake drum 3 and return to the initial position after braking.

[0038] Specifically, the top support assembly includes a first support rod 16, an L-shaped connecting rod 17, a second support rod 18, a third support rod 19 and a top support rod 20. The first support rod 16 is fixedly mounted on the front side of the back plate 1 and is located on the left side of the connecting hole 2. The L-shaped connecting rod 17 is rotatably mounted on the first support rod 16 and is located in front of the first brake shoe 5. The second support rod 18 is fixedly mounted on the first brake shoe 5 and is slidably connected to the L-shaped connecting rod 17. The third support rod 19 is fixedly mounted on the second brake shoe 7. The top support rod 20 is rotatably mounted on the third support rod 19. The end of the top support rod 20 away from the third support rod 19 is rotatably connected to the L-shaped connecting rod 17. A telescopic hole 21 is provided on the L-shaped connecting rod 17. The second support rod 18 is slidably mounted in the telescopic hole 21. The telescopic hole 21 can facilitate the rotation of the L-shaped connecting rod 17 to avoid conflict with the first brake shoe 5 when the L-shaped connecting rod 17 rotates.

[0039] Specifically, an adjustment slot 22 is provided on the front side of the back plate 1 and is located on the right side of the first pin rod 4. The rear end of the second pin rod 6 is slidably installed in the adjustment slot 22. Two limit slots 23 are provided on the front side of the back plate 1. Limit rods 24 are fixedly installed on the first brake shoe 5 and the second brake shoe 7. The rear ends of the two limit rods 24 are respectively slidably installed in the two limit slots 23. The moving range of the first brake shoe 5 and the second brake shoe 7 can be limited and constrained through the two limit slots 23. A temperature sensor 25 is fixedly installed on the front side of the back plate 1. The temperature sensor 25 can detect the temperature of the brake drum 3 to reduce the probability of accidents.

[0040] In this embodiment, a control switch is installed on the vehicle center console or at a suitable position next to the center console. The motor 9 and the control switch are electrically connected to the external power line through wires in sequence to form a loop. The control switch can control the start and stop and forward and reverse operation of the motor 9.

[0041] Through the above structure, the self-energizing drum brake provided by the present invention can control the bottom ends of the first brake shoe 5 and the second brake shoe 7 to move away from each other, so that the two brake pads 8 conflict with the brake drum 3 to achieve the purpose of braking. It can also use the expansion of the first brake shoe 5 to control the rotation of the L-shaped connecting rod 17, thereby driving the top support rod 20 to push the second brake shoe 7 close to the brake drum 3, so that the extrusion force of the brake pad 8 on the brake drum 3 is enhanced, and the contact area between the brake pad 8 and the brake drum 3 is increased, thereby enhancing the braking force and making the wear of the brake pad 8 more uniform, thereby improving the service life of the brake pad 8. In specific use, when braking is required, the motor 9 is controlled to rotate forward. The motor 9 drives the cam 10 to rotate, and the cam 10 squeezes the bottom ends of the first brake shoe 5 and the second brake shoe 7, so that the bottom ends of the first brake shoe 5 and the second brake shoe 7 expand outward, driving the two brake pads 8 to contact the annular inner wall of the brake drum 3, and using friction to achieve the purpose of deceleration and braking. At the same time, the first brake shoe 5 drives the L-shaped connecting rod 17 to rotate, and then the top support rod 20 controls the top end of the second brake shoe 7 to move to the right and close to the brake drum 3, so that the squeezing force of the brake pad 8 on the brake drum 3 is enhanced, and the contact area between the brake pad 8 and the brake drum 3 is increased, thereby enhancing the braking force and making the wear of the brake pad 8 more uniform, thereby improving the service life of the brake pad 8.

[0042] The above describes in detail the self-energizing drum brake provided by the present invention. Specific embodiments are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may, without departing from the principles of the present invention, make various improvements and modifications to the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A self-energizing drum brake, characterized in that: The invention comprises a back plate (1), a connecting hole (2) is provided on the back plate (1), the back plate (1) is fixedly connected to the transmission shaft through the connecting hole (2), a brake drum (3) is detachably mounted on the back plate (1), a first pin rod (4) is fixedly mounted on the front side of the back plate (1), a first brake shoe (5) is rotatably mounted on the first pin rod (4), a second pin rod (6) is slidably mounted on the front side of the back plate (1), a second brake shoe (7) is rotatably mounted on the second pin rod (6), brake pads (8) are fixedly mounted on both the first brake shoe (5) and the second brake shoe (7), an actuating mechanism for controlling the two brake pads (8) to contact the brake drum (3) is provided on the back plate (1), and a supporting assembly for controlling the first brake shoe (5) and the second brake shoe (7) to move away from each other is also provided on the back plate (1).

2. A self-energizing drum brake according to claim 1, characterized in that: The actuating mechanism comprises a motor (9) and a cam (10), wherein the motor (9) is fixedly mounted on the front side of the back plate (1) and is located below the connecting hole (2), and the cam (10) is fixedly mounted on the output shaft end of the motor (9) and is located between the first brake shoe (5) and the second brake shoe (7), and the cam (10) is in sliding contact with the first brake shoe (5) and the second brake shoe (7), respectively.

3. A self-energizing drum brake according to claim 2, characterized in that: A mounting tube (11) is fixedly installed in the connecting hole (2), and a plurality of evenly distributed mounting holes are provided on the mounting tube (11).

4. The self-energizing drum brake according to claim 1, characterized in that: The first brake shoe (5) and the second brake shoe (7) are both provided with a first through hole (12), the two first through holes (12) are both located above the connecting hole (2) and are symmetrically distributed, and a first return spring (13) is provided in the two first through holes (12).

5. The self-energizing drum brake according to claim 1, characterized in that: The first brake shoe (5) and the second brake shoe (7) are both provided with a second through hole (14), the two second through holes (14) are both located below the connecting hole (2) and are symmetrically distributed, and a second return spring (15) is provided in the two second through holes (14).

6. The self-energizing drum brake according to claim 1, characterized in that: The top support assembly comprises a first support rod (16), an L-shaped connecting rod (17), a second support rod (18), a third support rod (19) and a top support rod (20), wherein the first support rod (16) is fixedly mounted on the front side of the back plate (1) and is located on the left side of the connecting hole (2), the L-shaped connecting rod (17) is rotatably mounted on the first support rod (16) and is located in front of the first brake shoe (5), the second support rod (18) is fixedly mounted on the first brake shoe (5) and is slidably connected to the L-shaped connecting rod (17), the third support rod (19) is fixedly mounted on the second brake shoe (7), the top support rod (20) is rotatably mounted on the third support rod (19), and one end of the top support rod (20) away from the third support rod (19) is rotatably connected to the L-shaped connecting rod (17).

7. The self-energizing drum brake according to claim 6, characterized in that: A telescopic hole (21) is provided on the L-shaped connecting rod (17), and the second supporting rod (18) is slidably installed in the telescopic hole (21).

8. The self-energizing drum brake according to claim 1, characterized in that: The front side of the back plate (1) is provided with an adjustment slot (22) located on the right side of the first pin rod (4), and the rear end of the second pin rod (6) is slidably installed in the adjustment slot (22).

9. The self-energizing drum brake according to claim 1, characterized in that: Two limiting grooves (23) are provided on the front side of the back plate (1); limiting rods (24) are fixedly mounted on the first brake shoe (5) and the second brake shoe (7); and rear ends of the two limiting rods (24) are slidably mounted in the two limiting grooves (23) respectively.

10. The self-energizing drum brake according to claim 1, characterized in that: A temperature sensor (25) is fixedly mounted on the front side of the back plate (1).

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