Drum brake with protective structure

Abstract

The utility model discloses a drum brake with a protective structure, which comprises a drum brake shell, a movable groove is arranged on the side wall of the drum brake shell, a rocker arm is rotatably mounted in the drum brake shell, and one end of the rocker arm extends to the outside of the drum brake shell through the movable groove. Due to the arrangement of the movable groove, the rocker arm, the dustproof assembly and the like, when the drum brake is braked and the rocker arm on the drum brake is placed, the surface of one side of the rocker arm can extrude the fixed plate at one end of the group of arc-shaped movable rods to move towards the swinging direction; the telescopic springs are pressed to generate reverse acting force to extrude and push the fixing plate to be tightly attached to the surface of the rocker arm, and the fixing plate on the other side of the rocker arm is pushed by the other telescopic spring to enable the other fixing plate to be attached to the surface of the other side of the rocker arm, so that the movable groove is blocked, silt entering the rocker arm is reduced, and the service life of the rocker arm is prolonged. And the situation that the interior of the drum brake shell is exposed to the outside through the movable groove, and the brake effect is affected due to the fact that silt is poured into the drum brake shell is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of braking devices, in particular to a drum brake with a protection structure. Background Technique

[0002] The cost of drum brakes is relatively low and the absolute braking force is strong. Therefore, they have been used on vehicles for nearly a century. In the prior art, a drum brake includes a housing, two brake shoe linings and a push block. During braking, the push block pushes the brake shoe linings to move outwards and press against the housing, and generates friction with the housing so that the housing stops rotating, achieving the purpose of braking.

[0003] When the existing hub expansion brake brakes, the rocker arm rotates to drive the camshaft to rotate, so that the left and right brake shoe assemblies rotate left and right around the fixed axis to open, achieving the braking effect. And one end of the rocker arm needs to extend outside the drum brake to be fixedly installed with the brake cable. Some existing drum brakes have through slots opened on the side wall of the housing to facilitate the swing of the rocker. As a result, the inside of the drum brake is exposed outside through the through slots. During long-term use, the inside of the drum brake will be affected by the sand and mud poured in, affecting the braking effect. In addition, the spring between the existing rocker arm and the brake cable is generally exposed outside. During vehicle driving, sand and gravel particles get stuck inside the spring, affecting the braking of the drum brake. Therefore, the utility model designs a drum brake with a protection structure to solve the problems existing in the prior art. Content of the Utility Model

[0004] The purpose of the utility model is to provide a drum brake with a protection structure to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A drum brake with a protection structure, including: a drum brake housing, a movable groove is opened on the side wall of the drum brake housing, a rocker arm is rotatably installed inside the drum brake housing, and one end of the rocker arm extends outside the drum brake housing through the movable groove. Dust-proof components are arranged on both sides of the side wall of the drum brake housing. The two dust-proof components are symmetrically arranged, and one end of the dust-proof component is placed on the surface of the rocker arm;

[0006] An adjusting bolt is movably penetrated through the inside of one end of the rocker arm, and an adjusting nut is threadedly installed at one end of the adjusting bolt. The surface of one side of the adjusting nut is placed on the surface of one end of the rocker arm. The other end of the adjusting bolt is installed with a brake cable. A protection component is arranged on the surface of the adjusting bolt, and one end of the protection component is placed on the surface of the rocker arm. The other end of the protection component is placed on the surface of one end of the brake cable.

[0007] Preferably, the dust-proof component includes: a positioning block fixedly installed on the side wall of the drum brake housing. One end of the positioning block is movably penetrated by an arc-shaped protective plate, and one side of the arc-shaped protective plate is movably installed on the side wall of the drum brake housing. The other end of the positioning block is movably penetrated by an arc-shaped movable rod, and a fixing plate is fixedly connected between one end of the arc-shaped movable rod and one end of the arc-shaped protective plate. The surface of the fixing plate is placed on the surface of one side of the rocker arm. A telescopic spring is sleeved on the surface of the arc-shaped movable rod, and one end of the telescopic spring is fixedly connected to the surface of one side of the positioning block, and the other end of the telescopic spring is fixedly connected to the surface of the fixing plate.

[0008] Preferably, one side of the arc-shaped protective plate is fixedly connected with a slider, and a chute is opened on the side wall of the drum brake housing. One side of the arc-shaped protective plate is slidably installed in the chute on the side wall of the drum brake housing through the slider.

[0009] Preferably, four balls are equidistantly installed along the circumference inside the other end of the positioning block, and one side of the balls is placed on the surface of the arc-shaped movable rod.

[0010] Preferably, the width of the activity groove is smaller than the width of the arc-shaped protective plate.

[0011] Preferably, the protective component includes: a first sleeve and a return spring. The first sleeve is sleeved on the surface of the other end of the adjusting bolt, and one end of the first sleeve is placed on the surface of the rocker arm. The other end inside the first sleeve is slidably installed with a second sleeve, and one end of the second sleeve is placed on the surface of one end of the brake cable. The return spring is sleeved on the surface of the other end of the adjusting bolt. One end of the return spring is placed on the inner wall of one end of the first sleeve, and the other end of the return spring is placed on the surface of the other end of the second sleeve.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. Through the settings of components such as the activity groove, rocker arm and dust-proof component in the present utility model, during the braking of the drum brake, when the rocker arm on the drum brake is placed, the surface of one side of the rocker arm will squeeze the fixing plate at one end of a group of arc-shaped movable rods to move in the swinging direction, so that the telescopic spring is compressed to generate a reverse acting force to squeeze and push the fixing plate to closely fit the surface of the rocker arm. And for the fixing plate on the other side of the rocker arm, under the push of another group of telescopic springs, the other group of fixing plates are made to fit on the surface of the other side of the rocker arm, thereby playing a role in blocking the activity groove, reducing the entry of sediment inside, and preventing the inside of the drum brake housing from being exposed outside through the activity groove, resulting in sediment being poured into the inside of the drum brake housing and affecting the braking effect;

[0014] 2. By providing components such as a rocker arm, a brake cable, and a protection component, since the second sleeve is slidably installed inside the first sleeve at one end, the length between the first sleeve and the second sleeve can be contracted to different degrees after adjusting the length of the adjusting bolt, so that the first sleeve and the second sleeve protect the surfaces of the return spring and the adjusting bolt, avoiding sand and gravel particles getting stuck inside the return spring during the running of the electric vehicle and affecting the braking of the drum brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic front sectional view of the present utility model;

[0016] Figure 2 of the present utility model Figure 1 is an enlarged schematic view of the structure at A in

[0017] Figure 3 of the present utility model Figure 1 is an enlarged schematic view of the structure at B in

[0018] In the figure: 1, drum brake housing; 101, movable groove; 2, rocker arm; 3, dust-proof component; 301, positioning block; 302, arc-shaped protection plate; 303, arc-shaped movable rod; 304, fixing plate; 305, telescopic spring; 4, adjusting bolt; 5, adjusting nut; 6, brake cable; 7, protection component; 701, first sleeve; 702, second sleeve; 703, return spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1 - 3 , an embodiment provided by the present utility model: a drum brake with a protection structure, including: a drum brake housing 1, a movable groove 101 is opened on the side wall of the drum brake housing 1, a rocker arm 2 is rotatably installed inside the drum brake housing 1, and one end of the rocker arm 2 extends to the outside of the drum brake housing 1 through the movable groove 101. Dust-proof components 3 are provided on both sides of the side wall of the drum brake housing 1, and the two dust-proof components 3 are symmetrically arranged. One end of the dust-proof component 3 is placed on the surface of the rocker arm 2; through the setting of the dust-proof component 3, the arc-shaped protection plates 302 symmetrically arranged on both sides of the surface of the rocker arm 2 can block the movable groove 101, avoiding the inside of the drum brake housing 1 being exposed to the outside through the movable groove 101, resulting in sand and mud entering the inside of the drum brake housing 1 and affecting the braking effect, and improving the protection effect of the drum brake;

[0021] An adjusting bolt 4 is movably and penetratingly arranged inside one end of the rocker arm 2, and an adjusting nut 5 is threadedly installed at one end of the adjusting bolt 4. The surface of one side of the adjusting nut 5 is placed on the surface of one end of the rocker arm 2. The other end of the adjusting bolt 4 is installed with a brake wire 6. A protective component 7 is arranged on the surface of the adjusting bolt 4, and one end of the protective component 7 is placed on the surface of the rocker arm 2, and the other end of the protective component 7 is placed on the surface of one end of the brake wire 6. Through the arrangement of the protective component 7, protection is provided for the inside of the return spring 703 and the surface of the adjusting bolt 4, preventing sand and gravel particles from getting stuck inside the return spring 703 during the running of the electric vehicle and affecting the braking of the drum brake.

[0022] Please refer to Figures 1 - 2 In the embodiment of the present utility model: The dust-proof component 3 includes: a positioning block 301, which is fixedly installed on the side wall of the drum brake housing 1. One end of the positioning block 301 is movably and penetratingly provided with an arc-shaped protective plate 302, and one side of the arc-shaped protective plate 302 is movably installed on the side wall of the drum brake housing 1. The other end of the positioning block 301 is movably and penetratingly provided with an arc-shaped movable rod 303, and a fixing plate 304 is fixedly connected between one end of the arc-shaped movable rod 303 and one end of the arc-shaped protective plate 302. The surface of the fixing plate 304 is placed on the surface of one side of the rocker arm 2. A telescopic spring 305 is sleeved on the surface of the arc-shaped movable rod 303, and one end of the telescopic spring 305 is fixedly connected to the surface of one side of the positioning block 301, and the other end of the telescopic spring 305 is fixedly connected to the surface of the fixing plate 304. Through the fixing plates 304 at one ends of the two symmetric arc-shaped movable rods 303 being placed on the surface of the rocker arm 2, during the braking of the drum brake, the rocker arm on the drum brake will be placed. When the rocker arm 2 swings to one side, at this time, the surface of one side of the rocker arm 2 squeezes the fixing plate 304 at one end of a group of arc-shaped movable rods 303 to move in the swinging direction, causing the fixing plate 304 to squeeze the telescopic spring 305 to contract, so that the telescopic spring 305 generates a reverse acting force to squeeze and push the fixing plate 304 to closely fit with the surface of the rocker arm 2. And for the fixing plate 304 on the other side of the rocker arm 2, under the push of the other group of telescopic springs 305, the other group of fixing plates 304 are made to fit on the surface of the other side of the rocker arm 2, thereby playing a role in blocking the movable groove 101, preventing the inside of the drum brake housing 1 from being exposed to the outside through the movable groove 101 and causing sand and mud to pour into the inside of the drum brake housing 1 and affecting the braking effect.

[0023] Please refer to Figures 1 - 2 In the embodiment of the present utility model: One side of the arc-shaped protective plate 302 is fixedly connected with a slider, and a sliding groove is opened on the side wall of the drum brake housing 1. One side of the arc-shaped protective plate 302 is slidably installed in the sliding groove on the side wall of the drum brake housing 1 through the slider. By slidably installing the arc-shaped protective plate 302 on the side wall of the drum brake housing 1, the stability of the movement of the arc-shaped protective plate 302 is further improved.

[0024] Please refer to Figures 1 - 2, in the embodiment of the present utility model: Four balls are equidistantly installed along the circumference inside the other end of the positioning block 301, and one side of the balls is placed on the surface of the arc-shaped movable rod 303. Through the arrangement of the balls, the contact area between the inside of the positioning block 301 and the surface of the arc-shaped movable rod 303 is reduced, the friction between the two is lowered, and the stability of the movement of the arc-shaped movable rod 303 is improved.

[0025] Please refer to Figure 1 , in the embodiment of the present utility model: The width of the movable groove 101 is smaller than the width of the arc-shaped protective plate 302. Since the width of the arc-shaped protective plate 302 is greater than the width of the movable groove 101, the arc-shaped protective plate 302 can completely cover the movable groove 101, improving the protection effect.

[0026] Please refer to Figure 1 and Figure 3 , in the embodiment of the present utility model: The protection component 7 includes: a first sleeve 701 and a return spring 703. The first sleeve 701 is sleeved on the surface of the other end of the adjusting bolt 4, and one end of the first sleeve 701 is placed on the surface of the rocker arm 2. The other end inside the first sleeve 701 is slidably installed with a second sleeve 702, and one end of the second sleeve 702 is placed on the surface of one end of the brake wire 6. The return spring 703 is sleeved on the surface of the other end of the adjusting bolt 4. One end of the return spring 703 is placed on the inner wall of one end of the first sleeve 701, and the other end of the return spring 703 is placed on the surface of the other end of the second sleeve 702. Through the arrangement of the first sleeve 701 and the second sleeve 702, the length between the first sleeve 701 and the second sleeve 702 can be contracted to different degrees after adjusting the length of the adjusting bolt 4, so that the first sleeve 701 and the second sleeve 702 play a protective role on the surface of the adjusting bolt 4, preventing sand and gravel particles from getting stuck inside the return spring 703 during the running of the electric vehicle and affecting the braking of the drum brake.

[0027] Working principle: In a drum brake, the rocker arm on the drum brake is arranged. When the rocker arm 2 swings to one side, the surface on one side of the rocker arm 2 squeezes the fixing plate 304 at one end of a set of arc-shaped movable rods 303 to move in the swinging direction, causing the fixing plate 304 to squeeze the telescopic spring 305 to contract. As a result, the telescopic spring 305 generates a reverse acting force to squeeze and push the fixing plate 304 to closely fit the surface of the rocker arm 2. And the fixing plate 304 on the other side of the rocker arm 2, under the push of another set of telescopic springs 305, makes the other set of fixing plates 304 fit on the surface of the other side of the rocker arm 2, thereby playing a role in blocking the movable groove 101 and preventing sediment from entering the drum brake housing 1 and affecting the braking effect. In addition, the length between the first sleeve 701 and the second sleeve 702 can be contracted to different degrees after adjusting the length of the adjusting bolt 4, and under the squeezing and pushing of the return spring 703, one end of the first sleeve 701 abuts against the surface of the rocker arm 2, and one end of the second sleeve 702 abuts against the end of the brake cable 6, playing a protective role for the surface of the adjusting bolt 4 and avoiding sand and gravel particles getting stuck inside the return spring 703 during the running of the electric vehicle and affecting the braking of the drum brake. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0028] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent substitution on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A drum brake with a protective structure, comprising: Drum brake housing (1), characterized in that: a movable groove (101) is provided on the side wall of the drum brake housing (1), a rocker arm (2) is rotatably installed inside the drum brake housing (1), and one end of the rocker arm (2) extends to the outside of the drum brake housing (1) through the movable groove (101), dust-proof components (3) are provided on both sides of the side wall of the drum brake housing (1), the two dust-proof components (3) are symmetrically arranged, and one end of the dust-proof component (3) is placed on the surface of the rocker arm (2); An adjusting bolt (4) is movably penetrated through the inside of one end of the rocker arm (2), and an adjusting nut (5) is threadedly installed at one end of the adjusting bolt (4), the surface of one side of the adjusting nut (5) is placed on the surface of one end of the rocker arm (2), the other end of the adjusting bolt (4) is installed with a brake cable (6), a protective component (7) is provided on the surface of the adjusting bolt (4), and one end of the protective component (7) is placed on the surface of the rocker arm (2), and the other end of the protective component (7) is placed on the surface of one end of the brake cable (6).

2. The drum brake with a protection structure according to claim 1, characterized in that: The dust-proof component (3) includes: a positioning block (301), the positioning block (301) is fixedly installed on the side wall of the drum brake housing (1), an arc-shaped protective plate (302) is movably penetrated through one end of the positioning block (301), and one side of the arc-shaped protective plate (302) is movably installed on the side wall of the drum brake housing (1), an arc-shaped movable rod (303) is movably penetrated through the other end of the positioning block (301), and a fixing plate (304) is fixedly connected between one end of the arc-shaped movable rod (303) and one end of the arc-shaped protective plate (302), the surface of the fixing plate (304) is placed on the surface of one side of the rocker arm (2), a telescopic spring (305) is sleeved on the surface of the arc-shaped movable rod (303), and one end of the telescopic spring (305) is fixedly connected to the surface of one side of the positioning block (301), and the other end of the telescopic spring (305) is fixedly connected to the surface of the fixing plate (304).

3. The drum brake with a protective structure according to claim 2, characterized in that: A slider is fixedly connected to one side of the arc-shaped protective plate (302), a chute is provided on the side wall of the drum brake housing (1), and one side of the arc-shaped protective plate (302) is slidably installed in the chute on the side wall of the drum brake housing (1) through the slider.

4. A drum brake with a protective structure according to claim 3, characterized in that: Four balls are equidistantly installed along the circumference inside the other end of the positioning block (301), and one side of the balls is placed on the surface of the arc-shaped movable rod (303).

5. A drum brake with a protective structure according to claim 1, characterized in that: The width of the movable groove (101) is smaller than the width of the arc-shaped protective plate (302).

6. The drum brake with a protection structure according to claim 1, characterized in that: The protection component (7) includes: a first sleeve (701) and a return spring (703). The first sleeve (701) is sleeved on the surface of the other end of the adjusting bolt (4), and one end of the first sleeve (701) is placed on the surface of the rocker arm (2). The other end inside the first sleeve (701) is slidably installed with a second sleeve (702), and one end of the second sleeve (702) is placed on the surface of one end of the brake wire (6). The return spring (703) is sleeved on the surface of the other end of the adjusting bolt (4). One end of the return spring (703) is placed on the inner wall of one end of the first sleeve (701), and the other end of the return spring (703) is placed on the surface of the other end of the second sleeve (702).

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