Clearance-adjustable drum brake

Abstract

The utility model discloses a drum brake capable of adjusting clearance, which comprises a brake bottom plate, a shoe plate mounting seat is fixedly connected to the bottom of the middle position of the front end of the brake bottom plate, brake shoes are respectively and movably hinged to two sides of the shoe plate mounting seat, and a clearance adjusting structure is arranged between the two groups of brake shoes. According to the gap-adjustable drum brake, the traction springs, the adjusting nuts, the adjusting rods, the positioning seats and the adjusting holes are arranged, when the gap-adjustable drum brake is used, the brake shoes are synchronously reset under the traction of the traction springs, and when the gap between the two groups of brake shoes and the brake drum needs to be adjusted, the adjusting rods on the two sides of the traction springs are pushed or pulled along the adjusting holes in the positioning seats, so that the gap between the two groups of brake shoes and the brake drum is adjusted. The tension of the traction spring is changed, after the proper gap is adjusted, the adjusting nut is screwed down, the position of the adjusting nut tightly attached to the positioning seat and the brake shoe is determined, the function of conveniently adjusting the gap is achieved, and the problem that the device does not have the function of conveniently adjusting the gap is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of brakes, in particular to a drum brake with adjustable clearance. Background Art

[0002] Drum brakes utilize a brake transmission mechanism to cause the brake shoe to press the brake friction pad against the inside of the brake drum, thereby generating braking force to slow down the wheels or stop the car in the shortest distance as needed, to ensure driving safety and to ensure that the car is parked securely and cannot slip automatically.

[0003] The common drum brakes on the market are mostly similar in structure. The main shell is divided into a brake drum and a brake base plate, in which the brake drum is connected to the car wheel hub, and the main structure of the brake is installed in the brake base plate. The brake shoe is pushed to move by the brake wheel cylinder, and the friction plate on the outside of the brake shoe is close to the inner wall of the brake drum. There are some functional deficiencies in actual use and there is room for improvement. For example, the position between the two sets of brake shoes is determined by springs. As the brakes age, the elastic force of the springs decays, and the gap between the brake shoes and the brake drums will change, which in turn affects the response speed of the brakes. The current solution is to directly replace the springs, which is costly, and the gap cannot be directly adjusted, and the function of facilitating the adjustment of the gap is not available.

[0004] Now, a novel clearance-adjustable drum brake is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a drum brake with adjustable clearance, so as to solve the problem that the above-mentioned background technology does not have the function of facilitating clearance adjustment.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a drum brake with adjustable clearance, comprising a brake base plate, a shoe mounting seat fixedly connected to the bottom at the middle position of the front end of the brake base plate, brake shoes are movably hinged on both sides of the shoe mounting seat, a friction plate is fixedly connected to one side of the brake shoe, a brake wheel cylinder is installed at the top at the middle position of the front end of the brake base plate, a reserved groove is provided inside the front end of the brake shoe, a dust cover is provided at the front end of the reserved groove, a mounting plate is installed at the middle position of the front end of the brake shoe, and a clearance adjustment structure is provided between the two groups of brake shoes.

[0007] The gap adjustment structure includes four groups of positioning seats, which are respectively fixedly connected to the upper and lower ends of the front ends of the two groups of brake shoes. A traction spring is transversely arranged between one side of the two groups of positioning seats, and adjustment rods are transversely arranged on both sides of the traction spring. The outside of the adjustment rod is sleeved with an adjustment nut, and the inside of the positioning seat is provided with an adjustment eye.

[0008] Preferably, the traction spring and the adjusting rod are made of the same material, and the adjusting rod is provided with threads on its exterior.

[0009] Preferably, the threads on the outside of the adjusting rod match the threads on the inside of the adjusting nut, and one side of the adjusting nut fits with one side of the positioning seat.

[0010] Preferably, the outer diameter of the adjusting rod is consistent with the inner diameter of the adjusting eye, and the adjusting rod can slide left and right along the inside of the adjusting eye.

[0011] Preferably, an RFID chip is horizontally placed inside the reserved groove, and the rear end of the dustproof cover plate is connected to the inside of the reserved groove.

[0012] Preferably, the shape and size of the outer part of the dust cover plate are consistent with the shape and size of the inner part of the reserved groove, and the front end of the dust cover plate is consistent with the vertical plane where the front end of the brake shoe is located.

[0013] Preferably, a sensor holder is provided at the middle position of the front end of the mounting plate, an infrared temperature sensor is fixedly connected inside the sensor holder, and the mounting plate is symmetrically distributed about the vertical center line of the brake base plate.

[0014] Preferably, two sets of mounting screws are respectively inserted at the upper and lower ends of the front of the mounting plate, and the mounting screws penetrate the front end of the mounting plate and extend into the interior of the brake shoe.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the clearance-adjustable drum brake not only realizes the function of facilitating the clearance adjustment and the function of facilitating the reading and storage of maintenance information, but also realizes the function of measuring the internal temperature;

[0016] (1) By providing a traction spring, an adjusting nut, an adjusting rod, a positioning seat and an adjusting eye, when in use, the matching brake drum is fixed on the wheel hub of the automobile, and the brake wheel cylinder extends outward, which can push the brake shoe to expand outward with the shoe plate mounting seat as a fulcrum. The friction plate on one side of the brake shoe is in close contact with the inner wall of the brake drum, and the rotation speed of the brake drum is reduced by friction. As the brake wheel cylinder retracts, the brake shoe is synchronously reset under the traction of the traction spring. When it is necessary to adjust the gap between the two groups of brake shoes and the brake drum, the adjusting rods on both sides of the traction spring are pushed or pulled along the adjusting eyes in the positioning seat to change the pulling force of the traction spring. After adjusting to a suitable gap, the adjusting nut is tightened to make it close to the positioning seat, and the position of the brake shoe is determined, thereby realizing the function of facilitating the adjustment of the gap.

[0017] (2) By providing a reserved slot, an RFID chip and a dust cover, when adjusting the gap or replacing the friction plate, the corresponding repair information can be entered into the RFID chip through a storage and reading device. When the vehicle is maintained in the later stage, the engineer can directly check it externally through the storage and reading device to determine whether it needs to be disassembled for maintenance, which can reduce the workload. The reserved slot and the dust cover can protect the RFID chip from damage, realizing the function of facilitating the reading and reading of maintenance information;

[0018] (3) By providing a mounting plate, a sensor holder, mounting screws and an infrared temperature sensor, when in use, during the braking process, the friction between the friction plate and the brake drum will generate a large amount of heat. If the handbrake is forgotten to be released, the friction plate will be in a friction state for a long time, and the braking performance of the friction plate itself will decay as the temperature rises. The driver in the car cannot feel it. The infrared temperature sensor on the sensor holder can monitor the temperature inside the brake in real time and feed it back to the vehicle system, which can remind the driver in time. The mounting plate and mounting screws provide physical support for the installation and fixation of the infrared temperature sensor, thereby realizing the function of measuring the internal temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view structural schematic diagram of the utility model;

[0020] Figure 2 It is a side-view enlarged structural schematic diagram of the positioning seat of the utility model;

[0021] Figure 3 For the utility model Figure 1 A partial cross-section at the center is an enlarged structural diagram;

[0022] Figure 4 It is a schematic diagram of an enlarged side view of the mounting plate of the utility model.

[0023] In the figure: 1. Brake base plate; 2. Shoe plate mounting seat; 3. Brake shoe; 4. Friction plate; 5. Traction spring; 6. Adjusting nut; 7. Adjusting rod; 8. Positioning seat; 9. Adjusting eye; 10. Brake wheel cylinder; 11. Reserved groove; 12. RFID chip; 13. Dust cover; 14. Mounting plate; 15. Sensor holder; 16. Mounting screws; 17. Infrared temperature sensor. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example 1: Please refer to Figure 1-4 A drum brake with adjustable clearance comprises a brake base plate 1, a shoe plate mounting seat 2 is fixedly connected to the bottom of the front middle position of the brake base plate 1, brake shoes 3 are respectively movably hinged on both sides of the shoe plate mounting seat 2, a friction plate 4 is fixedly connected to one side of the brake shoe 3, a brake wheel cylinder 10 is installed on the top of the front middle position of the brake base plate 1, and a clearance adjustment structure is arranged between the two groups of brake shoes 3;

[0026] See also Figure 1-4 A clearance-adjustable drum brake also includes a clearance adjustment structure, which includes four groups of positioning seats 8, which are respectively fixedly connected to the upper and lower ends of the front ends of the two groups of brake shoes 3, and a traction spring 5 is transversely arranged between one side of the two groups of positioning seats 8. Adjustment rods 7 are respectively transversely arranged on both sides of the traction spring 5, and the outer side of the adjustment rod 7 is sleeved with an adjustment nut 6, and the inner side of the positioning seat 8 is provided with an adjustment eye 9;

[0027] The traction spring 5 and the adjusting rod 7 are made of the same material. The adjusting rod 7 is provided with a thread on the outside. The thread on the outside of the adjusting rod 7 matches the thread on the inside of the adjusting nut 6. One side of the adjusting nut 6 matches one side of the positioning seat 8. The outer diameter of the adjusting rod 7 is consistent with the inner diameter of the adjusting eye 9. The adjusting rod 7 can slide left and right along the inside of the adjusting eye 9. The gap can be adjusted by adjusting the tightness of the spring.

[0028] Specifically, Figure 1 and Figure 2 As shown, the adjusting rods 7 on both sides of the traction spring 5 are pushed or pulled along the adjusting eyes 9 in the positioning seat 8 to change the tension of the traction spring 5. After adjusting to a suitable gap, the adjusting nut 6 is tightened to make it close to the positioning seat 8, and the position of the brake shoe 3 is determined.

[0029] Embodiment 2: A reserved groove 11 is provided inside the front end of the brake shoe 3, a dust cover 13 is provided at the front end of the reserved groove 11, an RFID chip 12 is horizontally placed inside the reserved groove 11, a rear end of the dust cover 13 is connected to the inside of the reserved groove 11, the shape and size of the outside of the dust cover 13 are consistent with the shape and size of the inside of the reserved groove 11, the front end of the dust cover 13 is consistent with the vertical plane where the front end of the brake shoe 3 is located, and maintenance information is stored and read, which is convenient for later reading and query;

[0030] Specifically, Figure 1 and Figure 3 As shown, the repair information can be entered into the RFID chip 12 through a storage and reading device. When the vehicle is maintained at a later stage, the engineer can directly check it externally through the storage and reading device to determine whether it needs to be disassembled for inspection, which can reduce the workload. The reserved slot 11 and the dust cover 13 can protect the RFID chip 12 from damage.

[0031] Embodiment 3: A mounting plate 14 is installed at the middle position of the front end of the brake shoe 3, a sensor holder 15 is provided at the middle position of the front end of the mounting plate 14, an infrared temperature sensor 17 is fixedly connected inside the sensor holder 15, the mounting plate 14 is symmetrically distributed about the vertical center line of the brake base plate 1, two sets of mounting screws 16 are respectively inserted at the upper and lower ends of the front of the mounting plate 14, the mounting screws 16 penetrate the front end of the mounting plate 14 and extend into the interior of the brake shoe 3, and the driving safety can be improved through temperature feedback;

[0032] Specifically, Figure 1 and Figure 4 As shown, the infrared temperature sensor 17 on the sensor holder 15 can monitor the temperature inside the brake in real time and feed it back to the vehicle system, which can promptly remind the driver. The mounting plate 14 and the mounting screws 16 provide physical support for the installation and fixation of the infrared temperature sensor 17.

[0033] Working principle: When the utility model is in use, first, the matching brake drum is fixed on the automobile wheel hub, and the brake wheel cylinder 10 extends outward, which can push the brake shoe 3 to expand outward with the shoe plate mounting seat 2 as the fulcrum. The friction plate 4 on one side of the brake shoe 3 is close to the inner wall of the brake drum, and the rotation speed of the brake drum is reduced by friction. As the brake wheel cylinder 10 retracts, the brake shoe 3 is reset synchronously under the traction of the traction spring 5. When it is necessary to adjust the gap between the two groups of brake shoes 3 and the brake drum, the adjusting rods 7 on both sides of the traction spring 5 are pushed or pulled along the adjusting eyes 9 in the positioning seat 8 to change the pulling force of the traction spring 5. After adjusting to the appropriate gap, tighten the adjusting nut 6 to make it close to the positioning seat 8, and the position of the brake shoe 3 is determined. When adjusting the gap or replacing the friction plate 4, the corresponding repair information can be entered into the RFID chip 12 through the storage and reading device. When the vehicle is maintained in the later stage, the engineer can directly check it externally through the storage and reading device to determine whether it needs to be disassembled for inspection, which can reduce the workload. The reserved groove 11 and the dust cover 13 can protect the RFID chip 12 from damage. During the braking process, the friction between the friction plate 4 and the brake drum will generate a lot of heat. For example, if the handbrake is forgotten to be released, the friction plate 4 is in a friction state for a long time. The braking performance of the friction plate 4 itself will decay with the increase of temperature. The driver cannot feel it in the car. The infrared temperature sensor 17 on the sensor holder 15 can monitor the temperature inside the brake in real time and feedback it to the vehicle system, which can remind the driver in time. The installation plate 14 and the installation screws 16 provide physical support for the installation and fixation of the infrared temperature sensor 17.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A drum brake with adjustable clearance, comprising a brake base plate (1), characterized in that: The bottom of the front middle position of the brake base plate (1) is fixedly connected with a shoe mounting seat (2), the two sides of the shoe mounting seat (2) are respectively movably hinged with brake shoes (3), one side of the brake shoe (3) is fixedly connected with a friction plate (4), the top of the front middle position of the brake base plate (1) is installed with a brake wheel cylinder (10), the front end of the brake shoe (3) is provided with a reserved groove (11) inside, the front end of the reserved groove (11) is provided with a dust cover (13), the middle position of the front end of the brake shoe (3) is installed with a mounting plate (14), and a gap adjustment structure is provided between the two groups of brake shoes (3); The clearance adjustment structure comprises four groups of positioning seats (8), the four groups of positioning seats (8) are respectively fixedly connected to the upper and lower ends of the front ends of the two groups of brake shoes (3), a traction spring (5) is transversely arranged between one side of the two groups of positioning seats (8), and adjustment rods (7) are respectively transversely arranged on both sides of the traction spring (5), the outside of the adjustment rod (7) is sleeved with an adjustment nut (6), and the inside of the positioning seat (8) is provided with an adjustment eye (9).

2. A clearance-adjustable drum brake according to claim 1, characterized in that: The traction spring (5) and the adjustment rod (7) are made of the same material, and the outside of the adjustment rod (7) is provided with a thread.

3. The clearance-adjustable drum brake according to claim 1, characterized in that: The external thread of the adjusting rod (7) matches the internal thread of the adjusting nut (6), and one side of the adjusting nut (6) matches one side of the positioning seat (8).

4. The clearance-adjustable drum brake according to claim 1, characterized in that: The outer diameter of the adjusting rod (7) is consistent with the inner diameter of the adjusting eye (9), and the adjusting rod (7) can slide left and right along the inside of the adjusting eye (9).

5. The clearance-adjustable drum brake according to claim 1, characterized in that: An RFID chip (12) is horizontally placed inside the reserved slot (11), and the rear end of the dustproof cover plate (13) is connected to the inside of the reserved slot (11).

6. The clearance-adjustable drum brake according to claim 1, characterized in that: The shape and size of the outside of the dust cover plate (13) are consistent with the shape and size of the inside of the reserved groove (11), and the front end of the dust cover plate (13) is consistent with the vertical plane where the front end of the brake shoe (3) is located.

7. The clearance-adjustable drum brake according to claim 1, characterized in that: A sensor holder (15) is provided at the middle position of the front end of the mounting plate (14), an infrared temperature sensor (17) is fixedly connected inside the sensor holder (15), and the mounting plate (14) is symmetrically distributed about the vertical center line of the brake base plate (1).

8. The clearance-adjustable drum brake according to claim 1, characterized in that: Two groups of mounting screws (16) are respectively inserted at the upper and lower ends of the front of the mounting plate (14), and the mounting screws (16) penetrate the front end of the mounting plate (14) and extend into the interior of the brake shoe (3).

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