Drum brake device with adjustable brake pad

Abstract

The utility model discloses a brake pad adjustable drum brake device which comprises a brake drum, one end of the brake drum is provided with a fixing disc, the fixing disc is provided with two brake shoes capable of rotating outwards in a mirror image mode, the brake shoes are provided with brake pads, one end of the top of each brake shoe is provided with an adjusting mechanism, and the other end of each brake shoe is provided with a brake pad adjusting mechanism. The piston of the wheel cylinder pushes the extrusion plate to the two ends to extrude the two brake shoes, the brake shoes are opened to drive the brake pads to rub the brake drum to achieve braking, and after the brake pads are abraded to a certain degree, the extrusion plate extends outwards by a certain distance, so that the brake pads are closer to the inner wall of the brake drum in the initial state, and braking is achieved. Therefore, when the brake pedal is treaded for braking, the problem that the brake stroke is lengthened due to the fact that the brake pad is abraded too much can be effectively avoided, the brake pad does not need to be replaced when abraded to a certain degree, the maintenance cost of a vehicle is reduced, and meanwhile the service life of the brake pad is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to drum brake braking technical field, concretely is a brake pad adjustable drum brake braking device. BACKGROUND

[0002] Drum brake braking is a kind of traditional braking system, and the core components of drum brake braking system are brake drum and brake shoe, brake drum is a metal component fixed on the wheel and rotates with the wheel, and brake shoe is the component fixed in the inside of wheel, when driver steps on brake pedal, brake force is transmitted to brake shoe by hydraulic system (hydraulic brake) or mechanical transmission (mechanical brake), makes it expand outward, and friction is generated with brake drum inner wall, thereby generating braking force, and the wheel is reduced or stopped rotation.

[0003] At present, the brake pedal of drum brake will be long in the pressing stroke after the brake pad wears certain thickness, at this time, the solution is to replace the brake pad, and the distance between brake pad and brake drum cannot be adjusted, thereby improving the maintenance cost of automobile.

[0004] Therefore, a brake pad adjustable drum brake braking device is provided to solve the above problems. UTILITY MODEL CONTENTS

[0005] 1. Technical problem to be solved by the utility model

[0006] In view of the defects in the prior art, the utility model aims at providing a brake pad adjustable drum brake braking device, and aims at solving the problem that the brake pedal of drum brake will be long in the pressing stroke after the brake pad wears certain thickness in the prior art, at this time, the solution is to replace the brake pad, and the distance between brake pad and brake drum cannot be adjusted, thereby improving the maintenance cost of automobile.

[0007] 2. Technical scheme

[0008] To achieve the above object, the utility model provides the following technical scheme:

[0009] A brake pad adjustable drum brake braking device, including brake drum, one end of brake drum is equipped with fixed disc, two brake shoes that can rotate outward are installed on the fixed disc in mirror image, brake pad is installed on brake shoe, adjusting mechanism is installed at the top of one end of brake shoe, wheel cylinder is installed between two adjusting mechanisms on the top of one side of fixed disc, wheel cylinder can drive brake shoe to rotate through adjusting mechanism, extrusion plate is installed on adjusting mechanism, and the position of extrusion plate can be adjusted.

[0010] As the preferred scheme of the utility model, the bottom one end of the brake shoe is installed with a rotating shaft between the fixed disc, a tension spring is installed between the inner side surfaces of the two brake shoes on the fixed disc, and the tension spring provides inward stretching force for the two brake shoes.

[0011] As the preferred scheme of the utility model, a circular ring is installed on the adjusting mechanism, the circular ring is embedded and installed at the top one end of the brake shoe, one end of the circular ring is installed with a screw rod, a nut is threadedly connected on the screw rod, and the nut is located at the inner side surface of one end of the brake shoe.

[0012] As the preferred scheme of the utility model, one end of the screw rod is a smooth circular rod, and the circular rod part is slidingly connected on the inner side of the circular ring, and one end of the extrusion plate is fixedly connected with the circular rod part of the screw rod.

[0013] As the preferred scheme of the utility model, a spring is installed between the inner side surface of the extrusion plate and the outer side surface of the circular ring, the spring is sleeved on the outer surface of the circular rod part of the screw rod, and one end of the extrusion plate is attached to one end of the wheel cylinder.

[0014] As the preferred scheme of the utility model, an oil delivery pipe is connected on the outer side surface of the fixed disc, one end of the oil delivery pipe is connected with the brake oil pump, the other end of the oil delivery pipe is connected with the wheel cylinder by extending into the inner side of the fixed disc, and the pistons at both ends of the wheel cylinder are respectively attached to one end of the two extrusion plates.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] The utility model discloses through the piston of wheel cylinder to push to both ends, make the extrusion plate on the adjusting mechanism extrude two brake shoes, make two brake shoes rotate and open simultaneously drive brake pad friction brake drum realizes the brake, can be through the telescopic length of adjusting extrusion plate after brake pad wears to a certain degree, and the extrusion plate is elongated to one end distance outward, the other end of adjusting mechanism will extrude brake shoe and open a certain angle at this moment, make brake pad more close to the inner wall of brake drum under the initial state, thereby when stepping on brake brake pedal brake, can effectively avoid the problem that brake stroke becomes long because brake pad wears more, need not replace when brake pad wears to a certain degree, reduce the maintenance cost of vehicle, improve the use cycle of brake pad simultaneously. ACCURACY OF DRAWINGS

[0018] Figure 1 It is the overall structure schematic view of the utility model discloses a brake pad adjustable drum brake brake device;

[0019] Figure 2 It is the fixed disc structure schematic view of the utility model discloses a brake pad adjustable drum brake brake device.

[0020] Figure 3 It is a brake shoe adjustable drum brake device brake shoe structure schematic view of the utility model;

[0021] Figure 4 It is a brake shoe adjustable drum brake device adjusting mechanism amplification structure schematic view of the utility model.

[0022] In the figure: 1, brake drum; 2, fixed disc; 21, brake shoe; 22, brake pad; 23, wheel cylinder; 3, oil pipe; 4, adjusting mechanism; 41, circular ring; 42, screw rod; 43, nut; 44, extrusion plate; 45, spring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] Embodiment:

[0025] Please refer to Figures 1-4 The embodiment provides a brake shoe adjustable drum brake device, which comprises a brake drum 1, one end of the brake drum 1 is provided with a fixed disc 2, two brake shoes 21 capable of rotating outward are symmetrically arranged on the fixed disc 2, brake pads 22 are arranged on the brake shoes 21, adjusting mechanisms 4 are arranged at the top of one end of the brake shoes 21, a wheel cylinder 23 is arranged on the top of one side of the fixed disc 2 between the two adjusting mechanisms 4, the wheel cylinder 23 can drive the brake shoes 21 to rotate through the adjusting mechanisms 4, extrusion plates 44 are arranged on the adjusting mechanisms 4, the position of the extrusion plates 44 can be adjusted in extension and retraction mode. When the brake shoe adjustable drum brake device is used, the extrusion plates 44 on the adjusting mechanisms 4 are extruded by the pistons of the wheel cylinder 23 to extrude the two brake shoes 21, so that the two brake shoes 21 are simultaneously rotated and opened to drive the brake pads 22 to frictionally brake the brake drum 1. When the brake pads 22 are worn to a certain degree, the extension length of the extrusion plates 44 can be adjusted, and the extrusion plates 44 are extended outward by a certain distance. At this time, the other end of the adjusting mechanisms 4 extrudes the brake shoes 21 to open a certain angle, so that the brake pads 22 are closer to the inner wall of the brake drum 1 in the initial state. Therefore, when the brake pedal is stepped on, the problem that the brake stroke is lengthened due to the wear of the brake pads 22 can be effectively avoided. The brake pads 22 do not need to be replaced when they are worn to a certain degree, the maintenance cost of the vehicle is reduced, and the service life of the brake pads is prolonged.

[0026] In the embodiment, as Figure 2As shown, the bottom end of the brake shoe 21 and the fixed disc 2 are installed with a rotating shaft, and a tension spring is installed between the inner side surfaces of the two brake shoes 21 on the fixed disc 2, which provides an inward tension force for the two brake shoes 21, thereby assisting the two brake shoes 21 to quickly return.

[0027] In the embodiment, as shown in Figure 3 , Figure 4 , one end of the screw rod 42 is a smooth round rod, and the round rod part is slidingly connected to the inner side of the circular ring 41, and one side surface of the extrusion plate 44 is fixedly connected to one end of the round rod part of the screw rod 42, so that when the nut 43 rotates on the screw rod 42, one end of the screw rod 42 can drive the extrusion plate 44 to move in position, realizing telescopic adjustment.

[0028] In the embodiment, as shown in Figure 2 , Figure 3 and Figure 4 , a spring 45 is installed between the inner side surface of the extrusion plate 44 and the outer side surface of the circular ring 41, the spring 45 is sleeved on the outer surface of the round rod part of the screw rod 42, and one end of the extrusion plate 44 is attached to one end of the wheel cylinder 23, so that when the extrusion plate 44 is subjected to the pushing force of the piston of the wheel cylinder 23, the extrusion plate 44 will apply pressure to the brake shoe 21, causing the brake shoe 21 to expand.

[0029] Working principle: when the brake pad adjustable drum brake device is used, the oil inlet pipe 3 inputs brake oil to the wheel cylinder 23, the piston of the wheel cylinder 23 pushes to the two ends, causing the extrusion plate 44 on the adjusting mechanism 4 to extrude the two brake shoes 21, the two brake shoes 21 simultaneously rotate and expand to drive the brake pad 22 to frictionally brake the drum 1, when the thickness of the brake pad 22 is worn to a certain degree, causing the travel of the brake pedal to become longer or the braking effect to weaken, a helper can rotate the nut 43, when the nut 43 rotates on the screw rod 42, one end of the screw rod 42 can drive the extrusion plate 44 to move in position, causing one end of the extrusion plate 44 to extend outward by a distance, since the position of the wheel cylinder 23 does not change, the brake shoe 21 expands by a certain angle under the action of the reaction force, causing the brake pad 22 to be closer to the inner wall of the drum 1 in the initial state, thereby effectively avoiding the problem of longer brake travel caused by excessive wear of the brake pad 22 when the brake pedal is stepped on, without the need to replace the brake pad 22 when it is worn to a certain degree, reducing the maintenance cost of the vehicle and prolonging the service life of the brake pad.

[0030] All the technical features in the embodiment can be freely combined according to actual needs.

[0031] The above embodiment is a preferred implementation scheme of the utility model, in addition to this, the utility model can be realized in other ways, and any obvious replacement without departing from the technical scheme concept is within the protection scope of the utility model.

Claims

1. A brake shoe adjustable drum brake assembly comprising a brake drum (1) characterised in that: One end of the brake drum (1) is provided with a fixed disc (2), two brake shoes (21) are symmetrically installed on the fixed disc (2) and can rotate outward, brake pads (22) are installed on the brake shoes (21), an adjusting mechanism (4) is installed at the top of each brake shoe (21), a wheel cylinder (23) is installed on the top of one side of the fixed disc (2) between the two adjusting mechanisms (4), the wheel cylinder (23) can drive the brake shoes (21) to rotate through the adjusting mechanism (4), and an extrusion plate (44) is installed on the adjusting mechanism (4) and can be positionally adjusted.

2. A brake pad adjustable drum brake assembly according to claim 1 wherein: A rotating shaft is installed between the bottom of each brake shoe (21) and the fixed disc (2), and a tension spring is installed between the inner sides of the two brake shoes (21) on the fixed disc (2), which provides an inward tension force for the two brake shoes (21).

3. A brake pad adjustable drum brake assembly as defined in claim 1 wherein: A circular ring (41) is installed on the adjusting mechanism (4) and is embedded at the top of each brake shoe (21), one end of the circular ring (41) is provided with a screw rod (42), a nut (43) is threadedly connected to the screw rod (42), and the nut (43) is located at the inner side of one end of the brake shoe (21).

4. A brake pad adjustable drum brake assembly according to claim 3 wherein: One end of the screw rod (42) is a smooth round rod, and the round rod part is in sliding connection with the inner side of the circular ring (41), and one end of the extrusion plate (44) is fixedly connected with the round rod part of the screw rod (42).

5. The brake pad adjustable drum brake assembly of claim 1 wherein: A spring (45) is installed between the inner side of the extrusion plate (44) and the outer side of the circular ring (41), the spring (45) is sleeved on the outer surface of the round rod part of the screw rod (42), and one end of the extrusion plate (44) is in contact with one end of the wheel cylinder (23).

6. A brake pad adjustable drum brake assembly as defined in claim 1 wherein: An oil delivery pipe (3) is connected to the outer side of the fixed disc (2), one end of the oil delivery pipe (3) is connected to a brake oil pump, the other end of the oil delivery pipe (3) extends into the inner side of the fixed disc (2) and is connected to the wheel cylinder (23), and the pistons at both ends of the wheel cylinder (23) are in contact with one end of the two extrusion plates (44).

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