A dual-piston parking brake

Abstract

This utility model relates to a dual-piston parking brake, belonging to the field of automotive braking technology. Parking mechanism one and parking mechanism two are respectively assembled in the brake caliper body. Friction pad assembly one is fixedly connected to both the brake caliper body and parking mechanism one, and friction pad assembly two is fixedly connected to both the brake caliper body and parking mechanism two. Connecting structure one and connecting structure two are fixedly connected to both sides of the brake caliper body. The advantages are its novel structure; when parking, the parking spring inside the brake pushes the piston and brake pads to clamp the brake disc, implementing parking braking. When driving, hydraulic pressure pushes the piston to compress the parking spring, causing the brake pads to disengage from the brake disc and release the parking brake. This solves the problem of insufficient braking force in single-piston parking brakes. It has a compact structure and features high braking force, small size, and high braking stability, improving the performance and reliability of parking brake products.

Description

Technical Field

[0001] This utility model belongs to the field of automotive braking technology, specifically relating to a dual-piston parking brake. Background Technology

[0002] As commercial vehicles develop towards high-speed and heavy-load operation, there is a need to equip them with safe and reliable parking brakes. Currently, most heavy-duty vehicles in China use air brakes or single-piston parking brakes. However, air brakes have drawbacks such as complex structure, large size, poor braking stability, and difficulty in gap adjustment, while single-piston parking brakes suffer from insufficient braking force. Summary of the Invention

[0003] This utility model provides a dual-piston parking brake to solve the problems existing when using air brakes or single-piston parking brakes for parking heavy-duty vehicles: air brakes have disadvantages such as complex structure, large size, poor braking stability, and difficulty in gap adjustment, while single-piston parking brakes have insufficient braking force.

[0004] The technical solution adopted by this utility model includes a brake caliper body, a parking mechanism one, a parking mechanism two, a friction pad assembly one, a friction pad assembly two, a connecting structure one, and a connecting structure two. The parking mechanism one and the parking mechanism two are respectively assembled in the brake caliper body. The friction pad assembly one is fixedly connected to the brake caliper body and the parking mechanism one, respectively. The friction pad assembly two is fixedly connected to the brake caliper body and the parking mechanism two, respectively. The connecting structure one and the connecting structure two are fixedly connected to both sides of the brake caliper body.

[0005] A sealing ring and a large retaining ring are installed in the rear groove of the brake caliper body.

[0006] A sealing ring 2 and a small retaining ring are installed in the front groove of the brake caliper body.

[0007] A sealing ring is installed at the front end of the brake caliper body.

[0008] The parking mechanism one and parking mechanism two have the same structure. Parking mechanism one includes a second piston, a first piston, an adjusting bolt, a parking spring and an end cap. The first piston is installed in the cylinder hole of the brake caliper body. The parking spring is installed between the first piston and the end cap with its concave surface facing each other. The end cap is threadedly connected to the brake caliper body. The second piston is installed in the hole of the first piston. The adjusting bolt is threadedly connected to the first piston and abuts against the second piston.

[0009] The adjusting bolt is fitted with a sealing ring.

[0010] The end cap is equipped with a sealing ring.

[0011] The first piston is fitted with a sealing ring six.

[0012] The friction pad assembly one and friction pad assembly two have the same structure. Friction pad assembly one includes an inner friction pad, an inner friction pad liner, an inner friction pad liner fixing magnet, an outer friction pad, an outer friction pad liner, and an outer friction pad liner fixing magnet. The inner friction pad is fixedly connected to the inner friction pad liner. The inner friction pad liner fixing magnet is installed in the hole of the second piston, and the inner friction pad liner is connected to the second piston through it. The outer friction pad is fixedly connected to the outer friction pad liner. The outer friction pad liner fixing magnet is installed in the hole of the front claw of the brake caliper, and the outer friction pad liner is connected to the brake caliper through it.

[0013] The first and second connection structures are identical. The first connection structure includes a guide bolt, a first retaining ring, a rubber pad, a second retaining ring, a connecting body, and a connecting nut. The rubber pad wraps around the first and second retaining rings on both sides. The guide bolt passes through the first retaining ring, the rubber pad, the second retaining ring, and the connecting body, and is threadedly connected to the connecting nut. The connecting body is fixedly connected to the brake caliper body.

[0014] The advantages of this utility model are its novel structure. The brake caliper body adopts two cylinder holes and two sets of spring-brake hydraulic release parking mechanism components. The parking spring, piston, end cap, and caliper body are installed together, and the parking brake clearance is adjusted using pistons, adjusting bolts, and other parts. When parking, the parking spring inside the brake pushes the piston and brake pads to clamp the brake disc, thus applying the parking brake. When driving, hydraulic pressure pushes the piston to compress the parking spring, causing the brake pads to disengage from the brake disc and release the parking brake. When the guide bolt and rubber pad are connected, the brake caliper floats axially. When the friction pads wear, the adjusting bolt can be rotated to move axially, adjusting the clearance between the piston and the friction pads to provide reliable parking force. This solves the problem of insufficient braking force in single-piston parking brakes. It has a compact structure and features high braking force, small size, and high braking stability, improving the performance and reliability of parking brake products. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is an axial view of the present invention. Detailed Implementation

[0017] See Figure 1 , 2 As shown, the system includes a brake caliper body 1, a parking mechanism 1 2, a parking mechanism 2 3, a friction pad assembly 1 4, a friction pad assembly 2 5, a connecting structure 1 6, and a connecting structure 2 7. The parking mechanism 1 2 and the parking mechanism 2 3 are respectively assembled in the brake caliper body 1. The friction pad assembly 1 4 is fixedly connected to the brake caliper body 1 and the parking mechanism 1 2, respectively. The friction pad assembly 2 5 is fixedly connected to the brake caliper body 1 and the parking mechanism 2 3, respectively. The connecting structure 1 6 and the connecting structure 2 7 are fixedly connected to both sides of the brake caliper body 1, respectively.

[0018] The brake caliper 1 has a sealing ring 101 and a large retaining ring 102 installed in the rear groove, which can provide sealing support for the movement of the first piston.

[0019] The front groove of the brake caliper 1 is equipped with a sealing ring 2 103 and a small retaining ring 104, which can provide sealing support for the movement of the first piston.

[0020] A sealing ring 3105 is installed at the front end of the brake caliper body 1.

[0021] The parking mechanism 2 and parking mechanism 3 have the same structure. Parking mechanism 2 includes a second piston 201, a first piston 202, an adjusting bolt 203, a parking spring 204, and an end cap 205. The first piston 202 is installed in the cylinder bore of the brake caliper 1. The parking spring 204 is installed concave-convexly between the first piston 202 and the end cap 205. The end cap 205 is threadedly connected to the brake caliper 1. The second piston 201 is installed in the bore of the first piston 202. The adjusting bolt 203 is threadedly connected to the first piston 202 and abuts against the second piston 201. By rotating the adjusting bolt 203, the second piston 201 and the friction pad are pushed forward, adjusting the gap between the friction pad and the brake disc. The gap size is smaller than the distance between the first piston 202 and the end face of the brake caliper 1. When the friction pad and brake disc wear, the spring braking and hydraulic release parking brake can be achieved by adjusting the fit between the piston and the adjusting bolt.

[0022] The adjusting bolt 203 is fitted with a sealing ring 20301.

[0023] The end cap 205 is equipped with a sealing ring 20501.

[0024] The first piston 202 is equipped with a sealing ring 6 20201.

[0025] The friction plate group 4 and the friction plate group 5 have the same structure. The friction plate group 4 includes an inner friction plate 401, an inner friction plate liner 402, an inner friction plate liner fixing magnet 403, an outer friction plate 404, an outer friction plate liner 405, and an outer friction plate liner fixing magnet 406. The inner friction plate 401 is fixedly connected to the inner friction plate liner 402. The inner friction plate liner fixing magnet 403 is installed in the hole of the second piston 201, and the inner friction plate liner 402 is connected to the second piston through it. The outer friction plate 404 is fixedly connected to the outer friction plate liner 405. The outer friction plate liner fixing magnet 406 is installed in the hole of the front claw of the brake caliper 1, and the outer friction plate liner 405 is connected to the brake caliper 1 through it.

[0026] The first connection structure 6 and the second connection structure 7 have the same structure. The first connection structure 6 includes a guide bolt 601, a first retaining ring 602, a rubber pad 603, a second retaining ring 604, a connecting body 605, and a connecting nut 606. The rubber pad 603 wraps around the first retaining ring 602 and the second retaining ring 604 on both sides. The guide bolt 601 passes through the first retaining ring 602, the rubber pad 603, the second retaining ring 604, and the connecting body 605, and is threadedly connected to the connecting nut 606. The connecting body 605 is fixedly connected to the brake caliper body 1.

[0027] The brake caliper body is made of 42CrMo, the piston is made of 40Cr, the retaining ring is made of PTFE (polytetrafluoroethylene), and the sealing ring is made of nitrile rubber.

[0028] Working principle

[0029] The brake caliper is connected to the vehicle wheel end via guide bolt 601 and connecting nut 606. During assembly, the guide bolt contacts the rubber pad, causing the rubber pad to compress and deform. The retaining ring restricts the radial deformation of the rubber pad, thus allowing the brake caliper to float axially during operation. Four friction pads are used, with each cylinder bore in the brake cylinder corresponding to a single friction pad. The friction pads can move axially to provide braking. When parking, the parking spring inside the brake system pushes the piston and brake pads to clamp the brake disc, implementing the parking brake. When driving, hydraulic pressure pushes the first piston to compress the parking spring, causing the friction pads to disengage from the brake disc and releasing the parking brake. Specifically:

[0030] When the vehicle is off and not in operation, the spring force of the parking springs 204 in the two cylinder bores pushes the first piston 202. The first piston then pushes the adjusting bolt 203 to move the second piston 201 forward. The second piston 201 in the two cylinder bores pushes the two inner friction pads 401 to press against one side of the brake disc to generate friction. The reaction force causes the brake caliper 1 to move axially, which drives the two outer friction pads 404 to press against the other side of the brake disc to generate friction. This friction prevents the brake disc from rotating, and the brake disc then prevents the wheels from rotating to implement the parking brake, which is the spring brake.

[0031] Before the vehicle moves, the hydraulic system fills the space between the first piston 202 and the brake caliper 1 in the two cylinder holes of the brake caliper 1 with pressurized oil. The first piston 202 is compressed by the hydraulic pressure to the parking spring 204. At this time, the second piston 201 is no longer pushed by the adjusting bolt 203 and the first piston 202, the friction plate 401 no longer presses against the brake disc, the parking brake is released, that is, the hydraulic system is released.

[0032] During vehicle operation, the space between the first piston 202 and the sealed cavity of the brake caliper 1 is filled with hydraulic oil, and the first piston 202 is compressed by hydraulic pressure to release the parking spring 204 and release the brake.

Claims

1. A dual piston parking brake characterized by: It includes a brake caliper body, a parking mechanism 1, a parking mechanism 2, a friction pad assembly 1, a friction pad assembly 2, a connecting structure 1, and a connecting structure 2. The parking mechanism 1 and the parking mechanism 2 are respectively assembled in the brake caliper body. The friction pad assembly 1 is fixedly connected to the brake caliper body and the parking mechanism 1, respectively. The friction pad assembly 2 is fixedly connected to the brake caliper body and the parking mechanism 2, respectively. The connecting structure 1 and the connecting structure 2 are fixedly connected to both sides of the brake caliper body.

2. A dual piston parking brake according to claim 1 wherein: A sealing ring and a large retaining ring are installed in the rear groove of the brake caliper body.

3. A dual piston parking brake according to claim 1 wherein: A sealing ring 2 and a small retaining ring are installed in the front groove of the brake caliper body.

4. A dual piston parking brake according to claim 1 wherein: A sealing ring is installed at the front end of the brake caliper body.

5. A dual piston parking brake according to claim 1 wherein: The parking mechanism one and parking mechanism two have the same structure. Parking mechanism one includes a second piston, a first piston, an adjusting bolt, a parking spring and an end cap. The first piston is installed in the cylinder hole of the brake caliper body. The parking spring is installed between the first piston and the end cap with its concave surface facing each other. The end cap is threadedly connected to the brake caliper body. The second piston is installed in the hole of the first piston. The adjusting bolt is threadedly connected to the first piston and abuts against the second piston.

6. A dual piston parking brake according to claim 5 wherein: The adjusting bolt is fitted with a sealing ring.

7. A dual piston parking brake according to claim 5 wherein: The end cap is equipped with a sealing ring.

8. A dual piston parking brake according to claim 5 wherein: The first piston is equipped with a sealing ring six.

9. A dual piston parking brake according to claim 1 wherein: The friction pad assembly one and friction pad assembly two have the same structure. Friction pad assembly one includes an inner friction pad, an inner friction pad liner, an inner friction pad liner fixing magnet, an outer friction pad, an outer friction pad liner, and an outer friction pad liner fixing magnet. The inner friction pad is fixedly connected to the inner friction pad liner. The inner friction pad liner fixing magnet is installed in the hole of the second piston, and the inner friction pad liner is connected to the second piston through it. The outer friction pad is fixedly connected to the outer friction pad liner. The outer friction pad liner fixing magnet is installed in the hole of the front claw of the brake caliper, and the outer friction pad liner is connected to the brake caliper through it.

10. A dual piston parking brake according to claim 1 wherein: The first and second connection structures are identical. The first connection structure includes a guide bolt, a first retaining ring, a rubber pad, a second retaining ring, a connecting body, and a connecting nut. The rubber pad wraps around the first and second retaining rings on both sides. The guide bolt passes through the first retaining ring, the rubber pad, the second retaining ring, and the connecting body, and is threadedly connected to the connecting nut. The connecting body is fixedly connected to the brake caliper body.

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