Drum brake provided with buffer piece

Abstract

The drum brake comprises an end cover, rotating rods are rotationally connected to the two sides of the back face of an inner cavity of the end cover through bearing seats, connecting blocks are fixedly connected to the surfaces of the rotating rods, brake shoes are fixedly connected to the bottoms of the connecting blocks, and brake pads are fixedly connected to the outer surfaces of the brake shoes. When the elastic force of the reset spring is insufficient, a first limiting nut and a second limiting nut rotate on the surface of the limiting bolt in a threaded mode according to the situation to be loosened, so that the positions of the limiting blocks are adjusted by adjusting the penetrating position of the limiting bolt on the inner surface of the supporting base, and the elastic force of the buffer spring between the limiting blocks is changed; and after the brake shoe is adjusted to a proper position, the limiting nut I and the limiting nut II are rotated, so that the limiting nut I and the limiting nut II are tightly attached to the surface of the supporting seat, the position of the limiting block is limited, the elastic force can be adjusted, and the situation that the gap between the convex block connected with the brake shoe and the convex block of the driving rod is too large after resetting is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of drum brakes, in particular to a drum brake provided with a buffer piece. Background Art

[0002] The drum brake is fixed to the tire and rotates at the same speed. When braking, oil pressure is used to push the brake shoe to contact the inner edge of the brake drum. The friction generated by the contact is used to suppress the rotation of the tire to achieve the purpose of braking.

[0003] Driven by the brake lever, the two brake shoes are reset through the springs connected to them after driving the brake pads to brake. Due to the long-term stretching and resetting of the reset spring, the reset spring will have insufficient elastic force, which will cause a large gap between the protrusions connected to the brake shoes and the protrusions of the driving rod, thereby reducing the braking effect. For this reason, we propose a drum brake with a buffer that can adjust the elastic force between the brake shoes to avoid excessive gaps, so as to solve the above-mentioned shortcomings. Utility Model Content

[0004] The utility model aims to provide a drum brake provided with a buffer member, which can adjust the elastic force to avoid excessive clearance between the convex block connected to the brake shoe and the convex block of the driving rod, so as to solve the above-mentioned background technical problems.

[0005] The technical solution of the utility model for solving the above-mentioned technical problems is as follows: a drum brake provided with a buffer component comprises an end cover, both sides of the back side of the inner cavity of the end cover are rotatably connected with a rotating rod through a bearing seat, the surface of the rotating rod is fixedly connected with a connecting block, the bottom of the connecting block is fixedly connected with a brake shoe, the outer surface of the brake shoe is fixedly connected with a brake pad, the two brake pads are elastically hung on the adjacent sides through a return spring, the top of the connecting block is fixedly connected with a support seat, the inner surface of the support seat passes through a sliding limiting bolt, the opposite side of the two limiting bolts is fixedly connected with a limiting block, the opposite side of the limiting block is hung with a buffer spring, the surface of the limiting bolt is threadedly connected with a limiting nut one and a limiting nut two, and the surfaces of the limiting nut one and the limiting nut two are tightly fitted with the surface of the support seat.

[0006] Preferably, the back side of the inner cavity of the end cover is rotatably connected to a driving rod via a bearing seat, and the surface of the driving rod is fixedly connected to a driving protrusion.

[0007] Preferably, a fixed protrusion is fixedly connected to the bottom of the two brake shoes on the adjacent side, the surface of the driving protrusion slides in contact with the surface of the fixed protrusion, and the two fixed protrusions are centrally symmetrically arranged with the driving rod as the center point.

[0008] Preferably, a hollow through-going axial hole is embedded and fixedly connected at the axial center of the end cover.

[0009] Preferably, a hole is formed on the inner surface of the limit block, and the inner surface of the hole is connected to both ends of the buffer spring.

[0010] 1. The beneficial effect of the utility model is that when the elastic force of the reset spring is insufficient, the utility model only needs to make the limit nut 1 and the limit nut 2 rotate on the surface thread of the limit bolt according to the situation to loosen it, thereby adjusting the position of the limit block by adjusting the penetration position of the limit bolt on the inner surface of the support seat, so that the elastic force of the buffer spring between the limit blocks changes. When adjusted to the appropriate position, the limit nut 1 and the limit nut 2 are rotated again to make the limit nut 1 and the limit nut 2 fit tightly on the surface of the support seat, thereby limiting the position of the limit block. By setting the above structure, the elastic force can be adjusted, and the situation that the gap between the convex block connected to the brake shoe and the convex block of the drive rod is too large after resetting is avoided.

[0011] 2. The utility model provides a driving rod, which drives the driving protrusion to rotate through the action of an external driving force.

[0012] 3. The utility model sets the surface of the driving protrusion to slide in contact with the surface of the fixed protrusion, and the two fixed protrusions are arranged symmetrically with the driving rod as the center point, so that when the driving protrusion rotates, the convex design can drive the fixed protrusion to support the brake shoes on both sides.

[0013] 4. The utility model provides holes on the inner surface of the limit block, and the inner surfaces of the holes are connected to the two ends of the buffer spring. The arrangement of the holes facilitates the connection of the buffer spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] in:

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

[0016] Figure 2 It is a schematic diagram of the buffer spring structure of the utility model;

[0017] Figure 3 It is a back view of the end cover structure of the utility model.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] 1. End cover; 2. Turning rod; 3. Connecting block; 4. Brake shoe; 5. Brake pad; 6. Reset spring; 7. Support seat; 8. Limit bolt; 9. Limit block; 10. Buffer spring; 11. Limit nut 1; 12. Limit nut 2; 13. Driving rod; 14. Driving bump; 15. Fixed bump; 16. Shaft hole. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of a drum brake provided with a buffer member according to the present invention will be described with reference to the accompanying drawings.

[0021] Embodiment 1:

[0022] Figure 1-3 A drum brake with a buffer member in one embodiment of the utility model is shown, comprising an end cover 1, a driving rod 13 is rotatably connected to the back of the inner cavity of the end cover 1 through a bearing seat, a driving protrusion 14 is fixedly connected to the surface of the driving rod 13, the driving protrusion 14 is driven to rotate by the action of an external driving force by setting the driving rod 13, both sides of the back of the inner cavity of the end cover 1 are rotatably connected to a rotating rod 2 through a bearing seat, a connecting block 3 is fixedly connected to the surface of the rotating rod 2, a brake shoe 4 is fixedly connected to the bottom of the connecting block 3, and a fixed protrusion is fixedly connected to the bottom of the side where the two brake shoes 4 are close to each other 15, the surface of the driving protrusion 14 fits and slides with the surface of the fixed protrusion 15, and the two fixed protrusions 15 are centrally symmetrically arranged with the driving rod 13 as the center point. By setting the surface of the driving protrusion 14 to fit and slide with the surface of the fixed protrusion 15, the two fixed protrusions 15 are centrally symmetrically arranged with the driving rod 13 as the center point, the driving protrusion 14 can use the convex design to drive the fixed protrusion 15 to support the brake shoes 4 on both sides when rotating, and the outer surface of the brake shoe 4 is fixedly connected with a brake pad 5, and the side of the two brake pads 5 close to each other is elastically hung by a return spring 6 , the top of the connecting block 3 is fixedly connected with a support seat 7, the inner surface of the support seat 7 passes through a sliding limit bolt 8, the opposite side of the two limit bolts 8 is fixedly connected to a limit block 9, the opposite side of the limit block 9 is hung with a buffer spring 10, the surface of the limit bolt 8 is threadedly connected with a limit nut 11 and a limit nut 2 12, the surfaces of the limit nut 11 and the limit nut 2 12 are tightly fitted with the surface of the support seat 7, when the elastic force of the reset spring 6 is insufficient, it is only necessary to make the limit nut 11 and the limit nut 2 12 screw on the surface of the limit bolt 8 according to the situation. The groove is rotated to loosen it, thereby adjusting the position of the limit block 9 by adjusting the penetration position of the limit bolt 8 on the inner surface of the support seat 7, so that the elastic force of the buffer spring 10 between the limit blocks 9 changes. When adjusted to the appropriate position, the limit nut 11 and the limit nut 2 12 are rotated again to make the limit nut 11 and the limit nut 2 12 fit tightly against the surface of the support seat 7, thereby limiting the position of the limit block 9. By setting the above structure, the elastic force can be adjusted to avoid the situation where the gap between the protrusion connected to the brake shoe and the protrusion of the drive rod is too large after resetting.

[0023] Embodiment 2:

[0024] Figure 1-3A drum brake with a buffer member in one embodiment of the utility model is shown, comprising an end cover 1, a hollow through-going axial hole 16 is embedded and fixedly connected at the axis center of the end cover 1, both sides of the back side of the inner cavity of the end cover 1 are rotatably connected to a rotating rod 2 through a bearing seat, a connecting block 3 is fixedly connected to the surface of the rotating rod 2, a brake shoe 4 is fixedly connected to the bottom of the connecting block 3, a brake pad 5 is fixedly connected to the outer surface of the brake shoe 4, and the two brake pads 5 are elastically connected on one side by a return spring 6, a support seat 7 is fixedly connected to the top of the connecting block 3, and a sliding limit bolt 8 is passed through the inner surface of the support seat 7, and the two The side opposite to the limit bolt 8 is fixedly connected to the limit block 9, the inner surface of the limit block 9 is provided with a hole, and the inner surface of the hole is hung with the two ends of the buffer spring 10. By setting the inner surface of the limit block 9 with a hole, and the inner surface of the hole is hung with the two ends of the buffer spring 10, the setting of the hole facilitates the hanging of the buffer spring 10, and the buffer spring 10 is hung on the side opposite to the limit block 9. The surface of the limit bolt 8 is threadedly connected to the limit nut 11 and the limit nut 2 12, and the surfaces of the limit nut 11 and the limit nut 2 12 are tightly fitted with the surface of the support seat 7.

[0025] Working principle: When the utility model is used, the driving protrusion 14 is driven to rotate under the drive of the driving rod 13, thereby driving the fixed protrusion 15 to support the brake shoe 4, and then driving the brake pad 5 to be propped up, and then contacting the brake drum to achieve braking, and reset through the reset spring 6.

[0026] When the elastic force of the reset spring 6 is insufficient, it is only necessary to rotate the limit nut 11 and the limit nut 2 12 on the surface thread of the limit bolt 8 to loosen it, thereby adjusting the position of the limit block 9 by adjusting the penetration position of the limit bolt 8 on the inner surface of the support seat 7, so that the elastic force of the buffer spring 10 between the limit blocks 9 changes. When adjusted to the appropriate position, rotate the limit nut 11 and the limit nut 2 12 again, so that the limit nut 11 and the limit nut 2 12 fit tightly against the surface of the support seat 7, thereby limiting the position of the limit block 9, thereby achieving adjustable elastic force and avoiding the situation where the gap between the protrusion connected to the brake shoe and the protrusion of the drive rod is too large after resetting.

Claims

1. A drum brake provided with a buffer, comprising an end cover (1), characterized in that: Both sides of the back side of the inner cavity of the end cover (1) are rotatably connected to a rotating rod (2) through a bearing seat, the surface of the rotating rod (2) is fixedly connected to a connecting block (3), the bottom of the connecting block (3) is fixedly connected to a brake shoe (4), the outer surface of the brake shoe (4) is fixedly connected to a brake pad (5), the two brake pads (5) are elastically connected on the side close to each other through a return spring (6), the top of the connecting block (3) is fixedly connected to a support seat (7), the inner surface of the support seat (7) passes through a sliding limiting bolt (8), the opposite side of the two limiting bolts (8) is fixedly connected to a limiting block (9), the opposite side of the limiting block (9) is hung with a buffer spring (10), the surface of the limiting bolt (8) is threadedly connected to a limiting nut 1 (11) and a limiting nut 2 (12), the surfaces of the limiting nut 1 (11) and the limiting nut 2 (12) are tightly fitted with the surface of the support seat (7).

2. A drum brake with a buffer member according to claim 1, characterized in that: The back side of the inner cavity of the end cover (1) is rotatably connected to a driving rod (13) via a bearing seat, and the surface of the driving rod (13) is fixedly connected to a driving protrusion (14).

3. A drum brake with a buffer member according to claim 2, characterized in that: A fixed protrusion (15) is fixedly connected to the bottom of the adjacent side of the two brake shoes (4), the surface of the driving protrusion (14) and the surface of the fixed protrusion (15) are fitted and slid, and the two fixed protrusions (15) are centrally symmetrically arranged with the driving rod (13) as the center point.

4. A drum brake with a buffer member according to claim 1, characterized in that: A hollow through-going shaft hole (16) is embedded and fixedly connected at the axis center of the end cover (1).

5. A drum brake with a buffer member according to claim 1, characterized in that: The inner surface of the limit block (9) is provided with a hole, and the inner surface of the hole is connected to the two ends of the buffer spring (10).

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