Automobile parking brake

Abstract

The utility model relates to the technical field of automobile parking, and discloses an automobile parking brake which comprises a brake drum, an inner cavity is formed in the brake drum, brake shoes are installed on the two sides of the interior of the inner cavity in a hinged mode through supporting pins, wheel cylinder pistons are arranged on the two sides of the interior of a brake wheel cylinder, and the brake wheel cylinder pistons are connected with the brake drum. A hole body is formed in the top end of the interior of the brake drum, an oil pipe is installed in the hole body, and the bottom end of the oil pipe is fixed to the top end of the brake wheel cylinder. Due to the arrangement of the guide groove, the guide block and other assemblies, when the brake is used, the brake shoe can rotate so that the friction plate on one side can be attached to the inner side wall of the brake drum to conduct braking work, and when the brake shoe rotates, the guide groove and the guide block are additionally arranged at one end of the brake shoe. Therefore, the brake shoe stably pushes the friction plate to be attached to the inner side wall of the brake drum according to a certain motion trail for stopping, and the stopping stability of the stopping device is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parking, in particular to an automobile parking brake. Background Art

[0002] Car parking refers to stopping the vehicle, which means stopping the moving vehicle and stopping it at the corresponding position. The parking brake is a mechanical device installed on the vehicle body, which controls the movement of the vehicle and stops it. The drum brake is a type of parking brake, which uses a transmission mechanism to press the brake friction pad against the inside of the brake drum, thereby generating braking force for braking.

[0003] When a traditional automobile parking brake is used, the brake shoe rotates to push the friction plate to fit the inner wall of the brake drum for parking. However, the rotation of the brake shoe lacks a certain stability. As the use time increases, its motion trajectory may change, affecting the stability of parking. Therefore, we propose an automobile parking brake to improve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a vehicle parking brake to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a kind of automobile parking brake, comprising a brake drum, an inner cavity is arranged inside the brake drum, brake shoes are hingedly installed on both sides of the inner cavity through support pins, a return spring is installed between the two groups of brake shoes, a friction plate is arranged on one side of the brake shoe, a guide block is fixed at one end of the brake shoe, a guide groove is arranged at one end of the guide block, and the guide groove is arranged inside the brake drum, a brake wheel cylinder is fixed at one end of the brake drum, and wheel cylinder pistons are arranged on both sides of the brake wheel cylinder, a hole body is arranged at the top end of the brake drum, an oil pipe is installed inside the hole body, and the bottom end of the oil pipe is fixed to the top end of the brake wheel cylinder.

[0006] Preferably, the cross section of the guide groove is larger than the cross section of the guide block, and a sliding structure is formed between the guide groove and the guide block.

[0007] Preferably, a sealing plug is fixed to the inner side wall of the hole body through colloid.

[0008] Preferably, the inner diameter of the sealing plug is larger than the cross-section of the oil pipe, and a snap-fit ​​structure is formed between the sealing plug and the oil pipe.

[0009] Preferably, the cross section of the sealing plug is smaller than the cross section of the hole body, and a snap-fit ​​structure is formed between the sealing plug and the hole body.

[0010] Preferably, mounting blocks are fixed at both ends of one side of the friction plate, one end of the mounting block is provided with a mounting groove, and the mounting groove is provided at one end inside the brake shoe, and fixing bolts are installed inside the mounting block.

[0011] Preferably, the cross section of the mounting block is smaller than the cross section of the mounting groove, and a snap-fit ​​structure is formed between the mounting block and the mounting groove.

[0012] Preferably, two groups of the mounting blocks are provided, and the two groups of mounting blocks are symmetrically distributed about the center axis of the friction plate.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the automobile parking brake not only guides the brake shoe, allows the brake shoe to maintain a certain stability for braking, and facilitates the disassembly and replacement of the friction plate, but also achieves the sealing between the hole body and the oil pipe;

[0014] (1) By providing components such as guide grooves and guide blocks, when the brake is used, the brake shoe will rotate so that the friction plate on one side is attached to the inner wall of the brake drum to perform braking. When the brake shoe rotates, because the guide groove and the guide block are added to one end of the brake shoe, the brake shoe can stably push the friction plate to attach to the inner wall of the brake drum according to a certain motion trajectory to perform parking, thereby making the parking stability of the parking device stronger;

[0015] (2) By providing the components such as the mounting block, the mounting groove and the fixing bolts, when the brake is used, the friction plate inside the brake will be deformed and damaged as the use time increases. At this time, the friction plate needs to be replaced. Due to the addition of the above components, the friction plate can be quickly disassembled and installed from one side of the brake shoe, so that the friction plate is easy to disassemble, install and replace, and is more convenient to use;

[0016] (3) By providing components such as a sealing plug and a colloid, when the parking brake is in use, the oil pipe will extend through the hole body into the interior of the brake for use. After the oil pipe passes through the hole body, a sealing plug and a colloid are added inside the hole body to seal the gap between the sealing plug and the hole body, thereby ensuring the sealing of the brake. Subsequently, external dust and water are not easy to penetrate into the interior of the brake and cause damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a partial cross-sectional structure of the utility model in a front view;

[0018] Figure 2 It is a side view structural diagram of the friction plate of the utility model;

[0019] Figure 3 For the utility model Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0020] Figure 4 It is a rear view structural schematic diagram of the guide block of the utility model.

[0021] In the figure: 1, inner cavity; 2, friction plate; 3, brake shoe; 4, brake drum; 5, oil pipe; 6, hole body; 7, brake wheel cylinder; 8, wheel cylinder piston; 9, return spring; 10, guide groove; 11, mounting block; 12, mounting groove; 13, fixing bolt; 14, support pin; 15, sealing plug; 16, colloid; 17, guide block. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1: Please refer to Figure 1-4 , a parking brake for an automobile, comprising a brake drum 4, an inner cavity 1 is provided inside the brake drum 4, brake shoes 3 are hingedly installed on both sides of the inner cavity 1 through a support pin 14, a return spring 9 is installed between the two groups of brake shoes 3, a friction plate 2 is provided on one side of the brake shoe 3, a guide block 17 is fixed at one end of the brake shoe 3, a guide groove 10 is provided at one end of the guide block 17, and the guide groove 10 is provided inside the brake drum 4, a brake wheel cylinder 7 is fixed at one end of the brake drum 4, and wheel cylinder pistons 8 are provided on both sides of the brake wheel cylinder 7, a hole body 6 is provided at the top of the brake drum 4, an oil pipe 5 is installed inside the hole body 6, and the bottom end of the oil pipe 5 is fixed to the top of the brake wheel cylinder 7, the cross section of the guide groove 10 is larger than the cross section of the guide block 17, and a sliding structure is formed between the guide groove 10 and the guide block 17, which has a better guiding effect on the brake shoe 3;

[0024] Specifically, Figure 1 and Figure 3 As shown, when the brake shoe 3 rotates under the action of the wheel cylinder piston 8 to push the friction plate 2 to fit the inner wall of the brake drum 4 for braking, the guide block 17 at one end of the brake shoe 3 will rotate together in the guide groove 10 inside the brake drum 4 during the rotation of the brake shoe 3, guiding the rotation of the brake shoe 3, so that the brake shoe 3 always maintains a certain trajectory and stably pushes the friction plate 2 to fit the inner wall of the brake drum 4 for parking.

[0025] Embodiment 2: Both ends of one side of the friction plate 2 are fixed with mounting blocks 11, one end of the mounting blocks 11 is provided with mounting grooves 12, and the mounting grooves 12 are provided at one end inside the brake shoe 3, and fixing bolts 13 are installed inside the mounting blocks 11, and the cross section of the mounting blocks 11 is smaller than the cross section of the mounting grooves 12, and a snap-fit ​​structure is formed between the mounting blocks 11 and the mounting grooves 12, and two groups of mounting blocks 11 are provided, and the two groups of mounting blocks 11 are symmetrically distributed about the central axis of the friction plate 2, and the design of the symmetrically distributed mounting blocks 11 and the snap-fit ​​structure makes the installation connection between the friction plate 2 and the quasi-brake shoe 3 more stable;

[0026] Specifically, Figure 1 As shown, when the friction plate 2 is replaced, the fixing bolt 13 is screwed out, and then the friction plate 2 is pulled toward one end so that the mounting block 11 on one side moves out from the inside of the mounting groove 12 to remove the old friction plate 2. Then a new friction plate 2 is taken out and the mounting block 11 on one side is aligned with the mounting groove 12 inside the brake shoe 3 to engage and install it. Then the fixing bolt 13 is screwed in to fix the mounting block 11 and thus the friction plate 2 is fixed.

[0027] Embodiment 3: A sealing plug 15 is fixed to the inner wall of the hole body 6 through a colloid 16. The inner diameter of the sealing plug 15 is larger than the cross section of the oil pipe 5. A snap-fit ​​structure is formed between the sealing plug 15 and the oil pipe 5. The cross section of the sealing plug 15 is smaller than the cross section of the hole body 6. A snap-fit ​​structure is formed between the sealing plug 15 and the hole body 6, so that the sealing performance between the sealing plug 15 and the hole body 6 and the oil pipe 5 is better.

[0028] Specifically, Figure 1 and Figure 3 As shown, the inside of the hole body 6 is fixed with a colloid 16 through a sealing plug 15, and then the oil pipe 5 is inserted into the inside of the sealing plug 15 and fits tightly with the sealing plug 15, so that the sealing plug 15 forms a seal between the oil pipe 5 and the sealing plug 15, thereby preventing external dust and water from penetrating into the interior of the brake.

[0029] Working principle: When the utility model is in use, the brake drum 4 is connected to the axle, the brake shoe 3 is connected to the vehicle chassis, and the brake shoe 3 is installed inside the brake drum 4. When the vehicle is driving, the externally installed brake pedal is stepped on, and liquid is used as an intermediary to make the liquid inside the master cylinder connected to the outside of the brake flow to the oil pipe 5, and then flow to the brake wheel cylinder 7 through the oil pipe 5. The brake wheel cylinder 7 converts the energy of the liquid into physical movement to push the wheel cylinder piston 8 to move to both sides, so that the wheel cylinder piston 8 pushes the brake shoe 3 to rotate stably inside the guide groove 10 through the guide block 17. The rotating brake shoe 3 rotates and pushes the friction plate 2 to fit the inner wall of the brake drum 4 to complete the braking work.

[0030] 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 parking brake for an automobile, comprising a brake drum (4), characterized in that: The brake drum (4) is provided with an inner cavity (1), and brake shoes (3) are hingedly installed on both sides of the inner cavity (1) through support pins (14). A return spring (9) is installed between the two groups of brake shoes (3). A friction plate (2) is provided on one side of the brake shoe (3). A guide block (17) is fixed at one end of the brake shoe (3), and a guide groove (10) is provided at one end of the guide block (17). The guide groove (10) is arranged inside the brake drum (4). A brake wheel cylinder (7) is fixed at one end of the brake drum (4), and wheel cylinder pistons (8) are provided on both sides of the brake wheel cylinder (7). A hole body (6) is provided at the top of the brake drum (4), and an oil pipe (5) is installed inside the hole body (6), and the bottom end of the oil pipe (5) is fixed to the top of the brake wheel cylinder (7).

2. The automobile parking brake according to claim 1, characterized in that: The cross section of the guide groove (10) is larger than the cross section of the guide block (17), and a sliding structure is formed between the guide groove (10) and the guide block (17).

3. The automobile parking brake according to claim 1, characterized in that: A sealing plug (15) is fixed to the inner side wall of the hole body (6) via a colloid (16).

4. The automobile parking brake according to claim 3, characterized in that: The inner diameter of the sealing plug (15) is larger than the cross-section of the oil pipe (5), and a clamping structure is formed between the sealing plug (15) and the oil pipe (5).

5. The automobile parking brake according to claim 3, characterized in that: The cross section of the sealing plug (15) is smaller than the cross section of the hole body (6), and a snap-fit ​​structure is formed between the sealing plug (15) and the hole body (6).

6. The automobile parking brake according to claim 1, characterized in that: Both ends of one side of the friction plate (2) are fixed with mounting blocks (11), one end of the mounting block (11) is provided with a mounting groove (12), and the mounting groove (12) is arranged at one end inside the brake shoe (3), and a fixing bolt (13) is installed inside the mounting block (11).

7. The automobile parking brake according to claim 6, characterized in that: The cross section of the mounting block (11) is smaller than the cross section of the mounting groove (12), and a snap-fit ​​structure is formed between the mounting block (11) and the mounting groove (12).

8. The automobile parking brake according to claim 6, characterized in that: Two groups of the mounting blocks (11) are provided, and the two groups of the mounting blocks (11) are symmetrically distributed about the central axis of the friction plate (2).

Images