Single-pin non-uniform-thickness brake pad braking system

Abstract

The utility model relates to the technical field of drum brakes, in particular to a single-pin non-equal-thickness brake pad braking system which comprises a braking bottom plate, a brake shoe pin is fixed on the braking bottom plate, a cam is rotatably connected with the braking bottom plate, and two brake shoes are coaxially arranged in a center hole of the braking bottom plate. One end of the brake shoe is clamped with the brake shoe pin through a cotter pin hole, the other end of the brake shoe abuts against the S-shaped concave arc of the cam through a roller, and the brake shoe is pulled through a limiting spring and a return spring. Two brake pads are attached to the outer arc face of the brake shoe, and the two brake pads are gradually thickened from the two ends to the middle. According to the brake system, the brake shoe is connected through the single pin, so that the product structure is simplified, the product weight is reduced, the brake pad is thickest in the middle position of the brake shoe surface, namely a brake point during braking, and is gradually thinned towards the two ends, the brake area can be effectively kept for a long time, and light weight of the product is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of drum brakes, in particular to a single-pin unequal-thickness brake pad braking system. Background Art

[0002] The brake system of a car is related to driving safety and needs to maintain good braking performance at all times. However, since the brake pads are wearable parts, they need to be replaced after being worn to a certain extent. In addition, due to the wear of the brake pads, after a period of use, the contact area between the brake shoe and the brake drum is reduced due to the limit of the brake shoe's extension, which will reduce the braking effect. In addition, the replacement of the brake pads requires the removal of the brake shoe together, so the installation method of the brake shoe will greatly affect the difficulty and efficiency of its removal. Utility Model Content

[0003] The utility model aims to provide a single-pin non-uniform thickness brake pad braking system to address the deficiencies of the prior art. The system adopts a brake shoe with open ends and is installed with a single pin to facilitate installation and removal. The center of the arc surface of the brake shoe coincides with the center of the brake base plate, and a non-uniform thickness brake pad is used, so that when the brake shoe is extended outward for braking, the brake pad has more contact area with the brake drum.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a single-pin non-uniform thickness brake pad braking system, including a brake base plate, the brake base plate is fixedly equipped with a brake shoe pin and rotatably connected to a camshaft, the camshaft is fixed with a cam, the brake base plate is coaxial and its center hole is provided with two brake shoes, the two ends of the brake shoes are open pin holes, one end of the two brake shoes are engaged with the brake shoe pin through the open pin hole, the other ends of the two brake shoes are engaged with rollers through the open pin hole, the two rollers respectively resist the S-shaped concave arc of the cam, the upper and lower parts of the brake shoe pin are respectively provided with a limit spring for tightening the two brake shoes, a return spring for tightening the two brake shoes is provided near the cam, the outer arc surface of the brake shoe is fitted with two brake pads, and the two brake pads are gradually thickened from the two ends to the middle.

[0005] Preferably, the brake shoe includes an arc plate, a pair of parallel webs arranged on the inner side of the arc plate and perpendicular thereto, the web is an arc-shaped plate coaxial with the arc plate, a rib plate connecting the two webs and the arc plate at the same time is arranged between the two webs, and there are two rib plates which are parallel to each other.

[0006] Preferably, the open pin holes are arranged at both ends of the web, the open pin hole at one end of the web is an arc groove with a central angle less than 180°, and the open pin hole at the other end of the web is U-shaped.

[0007] Preferably, the brake base plate is fixed with a camshaft sleeve with an integrated air chamber bracket.

[0008] Preferably, a dust cover is fixed to the back side of the brake base plate, and the dust cover is provided with two observation holes.

[0009] The utility model has the following beneficial effects: a single pin non-uniform thickness brake pad braking system, which includes a brake base plate, the brake base plate is fixed with a brake shoe pin and is rotatably connected with a camshaft, the camshaft is fixed with a cam, the brake base plate is coaxial with a center hole thereof and is provided with two brake shoes, the two ends of the brake shoes are split pin holes, one end of the two brake shoes are engaged with the brake shoe pin through the split pin hole, the other end of the two brake shoes are engaged with rollers through the split pin hole, the two rollers respectively resist the S-shaped concave arc of the cam, the upper and lower parts of the brake shoe pin are respectively provided with a limit spring for tightening the two brake shoes, a return spring for tightening the two brake shoes is provided near the cam, the outer arc surface of the brake shoe is attached with two brake pads, and the two brake pads are gradually thickened from the two ends to the middle. The brake system adopts a single pin to connect the brake shoes, thereby simplifying the product structure and reducing the product weight, the brake pad is thickest at the middle position of the brake shoe surface, that is, the braking point when braking, and gradually thins toward the two ends, which can effectively maintain the braking area for a long time and realize product lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional diagram of the single-pin non-uniform thickness brake pad braking system of the utility model;

[0011] Figure 2 It is a front view of the single-pin non-uniform thickness brake pad braking system of the utility model;

[0012] Figure 3 yes Figure 2 Bottom view of .

[0013] Description of reference numerals:

[0014] 1 - brake base plate, 2 - brake shoe pin, 3 - camshaft, 4 - cam, 5 - brake shoe, 51 - arc plate, 52 - belly plate, 53 - rib plate, 6 - roller, 7 - limit spring, 8 - return spring, 9 - brake pad, 10 - camshaft sleeve, 11 - dust cover. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the scope of implementation of the present invention is not limited thereto.

[0016] like Figures 1 to 3As shown, the single-pin non-uniform thickness brake pad braking system of this embodiment includes a brake base plate 1, the brake base plate 1 is equipped with a brake shoe pin 2 and is rotatably connected to a camshaft 3, the camshaft 3 is fixed with a cam 4, the brake base plate 1 is coaxially provided with two brake shoes 5 in its center hole, both ends of the brake shoes 5 are open pin holes, one end of the two brake shoes 5 are engaged with the brake shoe pin 2 through the open pin hole, the other ends of the two brake shoes 5 are engaged with rollers 6 through the open pin hole, the two rollers 6 respectively resist the S-shaped concave arc of the cam 4, the upper and lower parts of the brake shoe pin 2 are respectively provided with a limit spring 7 for tightening the two brake shoes 5, and a return spring 8 for tightening the two brake shoes 5 is provided near the cam 4, the outer arc surface of the brake shoe 5 is attached with two brake pads 9, and the two brake pads 9 are gradually thickened from both ends to the middle.

[0017] The brake shoe 5 includes a curved panel 51, a pair of webs 52 arranged on the inner side of the curved panel 51 and perpendicular thereto, the web 52 is an arc-shaped plate coaxial with the curved panel 51, and a rib 53 is arranged between the two webs 52 to simultaneously connect the two webs 52 and the curved panel 51, and there are two ribs 53 that are parallel to each other.

[0018] This embodiment makes comprehensive structural optimization and improvement on the existing drum brake system: 1. The two brake shoes 5 share a brake shoe pin 2, which can make the outer arc surface of the brake shoe 5 longer, and increase the contact area between the brake pad 9 and the brake drum when braking; 2. The two ends of the brake shoe 5 are installed with split pin holes, so as to facilitate installation and removal; 3. The web 52 of the brake shoe 5 is made of two parallel steel plates, and the two rib plates 53 are also parallel to each other, so that the parting surface of the brake shoe 5 in this embodiment during casting is the outer arc surface of the arc plate 51, thereby reducing or eliminating the outer arc surface processing of the arc plate 51; 4. The brake base plate 1 is fixed with a camshaft sleeve 10 with an integrated air chamber bracket, and the air chamber bracket is integrated into the brake system and does not need to be welded to the axle; 5. The brake shoe 5 is riveted with two brake pads 9 of non-equal thickness, and the thickest point of the brake pad 9 is located at the braking point during braking, so as to maintain the effective friction area during braking while reducing the weight of the brake pad 9.

[0019] A dust cover 11 is fixed to the back of the brake bottom plate 1, and the dust cover 11 is provided with two observation holes. The two observation holes are directly facing the middle of the brake pad 9, so that the wear condition of the brake pad 9 is convenient to observe.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, and for the convenience of describing the technical solution, the front, rear, left, right, top, middle, and bottom directions adopted are based on the settings in the accompanying drawings, rather than limiting the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. Single pin non-uniform thickness brake pad braking system, characterized by: It includes a brake base plate, which is equipped with a brake shoe pin and is rotatably connected to a camshaft, a cam is fixed to the camshaft, and the brake base plate is coaxially provided with two brake shoes in its center hole, both ends of the brake shoes are open pin holes, one end of the two brake shoes are engaged with the brake shoe pin through the open pin hole, and the other ends of the two brake shoes are engaged with rollers through the open pin hole, and the two rollers respectively resist the S-shaped concave arc of the cam, and the upper and lower parts of the brake shoe pin are respectively provided with a limit spring for tightening the two brake shoes, and a return spring for tightening the two brake shoes is provided near the cam, and the outer arc surface of the brake shoe is fitted with two brake pads, and the two brake pads gradually thicken from both ends to the middle.

2. The single-pin non-uniform thickness brake pad braking system according to claim 1, characterized in that: The brake shoe includes a curved plate, and a pair of parallel webs arranged on the inner side of the curved plate and perpendicular thereto. The web is an arc-shaped plate coaxial with the curved plate. A rib plate connecting the two webs and the curved plate is arranged between the two webs. There are two rib plates that are parallel to each other.

3. The single-pin non-uniform thickness brake pad braking system according to claim 2, characterized in that: The open pin holes are arranged at both ends of the web, the open pin hole at one end of the web is an arc groove with a central angle less than 180°, and the open pin hole at the other end of the web is U-shaped.

4. The single-pin non-uniform thickness brake pad braking system according to claim 1, characterized in that: The brake base plate is fixed with a camshaft sleeve with an integrated air chamber support.

5. The single-pin non-uniform thickness brake pad braking system according to claim 1, characterized in that: A dust cover is fixed on the back side of the brake bottom plate, and the dust cover is provided with two observation holes.

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