Progressive adjustable drum brake structure

Abstract

A progressive adjustable drum brake structure is characterized in that two arc-shaped brake shoes are symmetrically arranged on a brake disc, friction plates are arranged on the outer arc surfaces of the brake shoes, shoe bodies of the two brake shoes are connected through a reset tension spring in a pulling mode, and a brake mechanism used for controlling the opening degree between the two brake shoes is arranged between one set of corresponding ends of the two brake shoes; an adjusting assembly is arranged between the other group of corresponding ends, the adjusting assembly can be adjusted up and down perpendicular to the two brake shoes, when the adjusting assembly is adjusted downwards, the adjusting assembly is expanded towards the two sides, the two brake shoes are expanded towards the two sides, and when the adjusting assembly is adjusted upwards, the two brake shoes are condensed towards the middle under the action of a reset tension spring. The brake mechanism is a hydraulic oil cylinder, the two ends of the hydraulic oil cylinder of the brake mechanism are connected with the two brake shoes respectively, and one end of the hydraulic oil cylinder is movably connected with one of the brake shoes through a cylindrical structure. The gap between the brake drum and the friction plate can be simply, conveniently and quickly adjusted, so that the friction plate is fully utilized, and the resource utilization rate is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of brake devices, in particular to a drum brake device. Background Art

[0002] The brake is the most important safety part on the vehicle, and the braking performance of the vehicle directly affects the driving safety of the vehicle. At present, the main braking methods of vehicles are disc brakes (disc brakes) and drum brakes (drum brakes). As a traditional design automatic structure, the drum brake is cheap and widely used. Its structure mainly includes brake drums, brake shoes, support pins, return springs and brake camshafts, etc. It relies on the brake camshaft to control the brake shoes to open outward, so that the friction pads on the brake shoes rub against the brake drum to achieve braking. When the brake drum or friction pad is worn, a brake gap will be formed. Once there is a brake gap, if the brake drum or friction pad is not replaced in time, it will easily cause the brake to be insensitive, resulting in safety hazards when emergency braking is required. In addition, frequent replacement of friction pads will inevitably increase the cost of use and cause waste of resources.

[0003] Chinese patent document CN202010677477.9 discloses "A Prismatic Adaptive Drum Brake Adjustment Device", in which a mechanism for adjusting the gap between drum brake shoes is disclosed, which facilitates the simple and quick adjustment of the gap between the brake drum and the friction plate through the adjustment component, so as to make full use of the friction plate and improve resource utilization. However, in this structure, the adjustment component is more difficult to process due to its complex structure.

[0004] In addition, the traditional drum brake has a limited rotation angle of the brake camshaft, which can only rotate within a specified angle range, and the effective braking eccentricity is fixed. For the worn friction pads and brake drums, it is impossible to further increase the distance of the friction pads to compensate for the brake clearance. Therefore, even if there is a clearance adjustment mechanism between the brake shoes, the effect that can be achieved is limited, and it is easy to cause eccentric wear of the friction pads and a decrease in the automatic effect. Summary of the invention

[0005] The utility model aims to provide a progressively adjustable drum brake structure to solve the technical problem of low utilization rate of brake shoes in drum brakes.

[0006] In order to solve the above technical problems, the specific technical solutions of the utility model are as follows:

[0007] A progressive adjustable drum brake structure comprises a brake disc, a reset spring and an adjusting component, wherein two arc-shaped brake shoes are symmetrically arranged on the brake disc, a friction plate is arranged on the outer arc surface of the brake shoe, the shoe bodies of the two brake shoes are connected by a reset spring, a brake mechanism for controlling the opening and closing degree between the two brake shoes is arranged between one group of corresponding ends of the two brake shoes, and an adjusting component is arranged between the other group of corresponding ends, the adjusting component can be adjusted up and down perpendicular to the two brake shoes, when the adjusting component is adjusted downward, the adjusting component opens the two brake shoes to both sides and expands them to both sides, when the adjusting component is adjusted upward, the two brake shoes shrink toward the middle under the action of the reset spring, and is characterized in that the brake mechanism is a hydraulic cylinder, the two ends of the hydraulic cylinder of the brake mechanism are respectively connected to the two brake shoes, and one end of the hydraulic cylinder is movably connected to one of the brake shoes through a cylindrical structure.

[0008] Furthermore, the adjustment assembly includes an adjustment rod and two sliding blocks, the adjustment rod passes through the brake disc and is fixed by an adjustment nut, the sliding block is clamped on the end of the brake shoe, and the sliding blocks are slidably connected to both sides of the adjustment rod;

[0009] The adjusting rod is provided with a pair of wedge-shaped side plates, which are matched and connected with the sliding block. The middle part of the adjusting rod is a positioning section, which is a polygonal column. A threaded section is connected below the positioning section, and the threaded section is connected with the adjusting nut.

[0010] Furthermore, the sliding block is provided with a sliding groove, which is an inclined groove. The exterior of the sliding block is in a semi-arc column shape, and a side edge is provided on the top.

[0011] Furthermore, the positioning section is a rectangular parallelepiped structure, which is matched and connected with the square hole on the brake disc.

[0012] Furthermore, a first connection portion and a second connection portion are provided on the brake disc, and the first connection portion and the second connection portion extend to the outside of the brake disc for connection with the vehicle body.

[0013] The technical solution of the utility model has the following advantages:

[0014] 1. The gap between the brake drum and the friction pad can be adjusted simply and quickly through the adjustment component to make full use of the friction pad, improve resource utilization, and ensure the braking effect.

[0015] The hydraulic cylinder avoids the problem of limited rotation angle of the camshaft of the traditional drum brake, further increases the braking stroke of the drum brake, and fully utilizes the friction plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2It is a structural schematic diagram of the adjustment component of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the sliding block of the utility model;

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of AA of the utility model;

[0020] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0021] Figure 6 This is a schematic diagram of the combined structure of Embodiment 2 of the present utility model;

[0022] Figure 7 This is a schematic diagram of the bottom structure of Example 2 of the utility model. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a progressive adjustable drum brake structure of the utility model in conjunction with the accompanying drawings.

[0024] Example 1

[0025] like Figure 1 As shown, a progressively adjustable drum brake structure of the utility model comprises a brake disc 1, a reset tension spring 4 and an adjusting assembly 6, two arc-shaped brake shoes 2 are symmetrically arranged on the brake disc 1, a friction plate 3 is arranged on the outer arc surface of the brake shoe 2, the shoe bodies of the two brake shoes 2 are connected by a reset tension spring 4, a brake mechanism 5 for controlling the opening and closing degree between the two brake shoes 2 is arranged between one group of corresponding ends of the two brake shoes 2, and an adjusting assembly 6 is arranged between the other group of corresponding ends.

[0026] In the actual application of the technical solution of the present application, the adjustment component 6 can be adjusted vertically to the two brake shoes 2. When the adjustment component is adjusted downward, the adjustment component 6 opens the two brake shoes 2 to both sides and expands them. When the adjustment component 6 is adjusted upward, the two brake shoes 2 are condensed to the middle under the action of the reset tension spring 4. The gap between the friction plate 3 on the brake shoe 2 and the inner side of the brake drum is controlled by the adjustment component 6. After the friction plate 3 is worn and thinned after long-term use, the gap between the friction plate 3 and the inner side of the brake drum becomes larger, and the brake forms a side length. The gap is narrowed by adjusting the component 6 to ensure that the friction plate 3 is fully utilized.

[0027] In the actual application of the technical solution of the present application, the brake mechanism 5 is a hydraulic cylinder, and the two ends of the hydraulic cylinder of the brake mechanism 5 are respectively connected to the two brake shoes 2, and one end of the hydraulic cylinder is movably connected to one of the brake shoes 2 through a cylindrical structure. The cylindrical structure can ensure a certain angle of deflection when the two brake shoes 2 are spread apart, so as to prevent the hydraulic cylinder from receiving axial bending stress.

[0028] Specifically, in this embodiment, the adjustment component 6 includes an adjustment rod 62 and two sliding blocks 61, wherein the adjustment rod 62 passes through the brake disc 1 and is fixed on the other side by an adjusting nut, and the sliding block 61 is clamped on the end head of the brake shoe 2, and a slide groove 611 is provided on the sliding block 61, and the slide groove 611 is an inclined groove, which can be matched and connected with the wedge-shaped side plate 621, and the wedge-shaped side plate 621 is fixed on both sides of the adjustment rod 62. The sliding block 61 can slide up and down on the wedge-shaped side plates 621 on both sides of the adjustment rod 62. During the sliding process, the distance between the sliding block 61 and the axis of the adjustment rod 62 gradually changes, thereby adjusting the gap of the brake shoe 2.

[0029] Specifically, the middle of the adjustment rod 62 is a positioning section 622, which is in the shape of a polygonal prism, and in this embodiment, a quadrangular prism is selected, and the positioning section 622 cooperates with the hole on the brake disc 1 to prevent the adjustment rod 62 and the brake disc 1 from rotating relative to each other. The positioning section 622 is connected to a threaded section 623 below, and the threaded section 623 is connected to the adjustment nut for fixing.

[0030] Specifically, in this embodiment, the sliding block 61 is semi-circular columnar, ensuring that the sliding block 61 can rotate relative to the brake shoe 2 in the horizontal direction. At the same time, a side edge 612 is provided on the top of the sliding block 61 to prevent the sliding block 61 from slipping off the brake shoe 2.

[0031] Specifically, the positioning section 622 is a rectangular parallelepiped structure, and is connected to the square hole on the brake disc 1 in cooperation.

[0032] Specifically, the brake disc 1 is provided with a first connection portion 11 and a second connection portion 12 , and the first connection portion 11 and the second connection portion 12 extend to the outside of the brake disc 1 for connection with a vehicle body.

[0033] Example 2

[0034] like Figure 5~Figure 7 As shown, in this embodiment, the wedge-shaped side plate 621 and the adjusting rod 62 are an integral structure. The advantage of this design is that the mechanism strength is higher and the processing difficulty of the adjusting rod 62 is lower.

[0035] In this embodiment, a threaded hole 624 is provided below the adjusting rod 62, and the threaded hole 624 is used to replace the connecting threaded section 623. During installation, the threaded hole 624 is used to fix the connection with the screw.

[0036] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A progressively adjustable drum brake structure, comprising a brake disc (1), a reset spring (4) and an adjustment component (6), wherein the brake disc (1) is symmetrically provided with two arc-shaped brake shoes (2), the outer arc surface of the brake shoe (2) is provided with a friction plate (3), the shoe bodies of the two brake shoes (2) are connected by a reset spring (4), a brake mechanism (5) for controlling the opening and closing degree between the two brake shoes (2) is provided between one set of corresponding ends of the two brake shoes (2), and an adjustment component (6) is provided between the other set of corresponding ends, the adjustment component (6) can be adjusted vertically to the two brake shoes (2), when the adjustment component is adjusted downward, the adjustment component (6) opens the two brake shoes (2) to both sides and expands them to both sides, when the adjustment component (6) is adjusted upward, the two brake shoes (2) are condensed toward the middle under the action of the reset spring (4), characterized in that The brake mechanism (5) is a hydraulic cylinder, the two ends of the hydraulic cylinder of the brake mechanism (5) are respectively connected to the two brake shoes (2), and one end of the hydraulic cylinder is movably connected to one of the brake shoes (2) via a cylindrical structure.

2. The progressively adjustable drum brake structure according to claim 1, characterized in that: The adjustment assembly (6) comprises an adjustment rod (62) and two sliding blocks (61); the adjustment rod (62) passes through the brake disc (1) and is fixed by an adjustment nut; the sliding block (61) is clamped on the end of the brake shoe (2); and the sliding block (61) is slidably connected to both sides of the adjustment rod (62); The adjusting rod (62) is provided with a pair of wedge-shaped side plates (621), the wedge-shaped side plates (621) are cooperatively connected to the sliding block (61), the middle part of the adjusting rod (62) is a positioning section (622), the positioning section (622) is in a polygonal column shape, a threaded section (623) is connected below the positioning section (622), and the threaded section (623) is connected to the adjusting nut.

3. The progressively adjustable drum brake structure according to claim 2, characterized in that: The sliding block (61) is provided with a sliding groove (611), and the sliding groove (611) is an inclined groove. The sliding block (61) is externally in the shape of a semi-circular arc column, and a side edge (612) is provided on the top.

4. The progressively adjustable drum brake structure according to claim 3, characterized in that: The positioning section (622) is a rectangular parallelepiped structure and is matched and connected with the square hole on the brake disc (1).

5. The progressively adjustable drum brake structure according to claim 4, characterized in that: A first connecting portion (11) and a second connecting portion (12) are provided on the brake disc (1); the first connecting portion (11) and the second connecting portion (12) extend toward the outside of the brake disc (1) and are used to be connected to a vehicle body.

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