Drum brake of electric vehicle

Abstract

The utility model discloses a drum brake of an electric vehicle. The drum brake comprises a brake box assembly, a brake shoe, a rocker arm and a cam shaft, the brake box assembly comprises a brake box body, a middle shaft sleeve, cam seats symmetrically arranged on the two sides of the middle shaft sleeve and a fixed core rotating shaft. The brake shoe is installed on the inner side of the brake box assembly through the cam shaft and the fixed-core rotating shaft. A frame limiting structure and a brake cable supporting structure are further arranged on the side, close to the fixed core rotating shaft, of the brake box body, and one end of the brake cable supporting structure outwards extends out of the brake box body and corresponds to the rocker arm. The drum brake solves the problems that an existing drum brake cannot be suitable for safe driving of rapid and large-load vehicles, and how to ensure the performance of the brake, reduce the product cost, achieve environmental protection and energy conservation, optimize the product structure and enhance the market competitiveness.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle brake technology, and in particular to an electric vehicle drum brake. Background Technology

[0002] Drum brakes, with their simple structure and convenient and flexible braking, have become an indispensable safety component for bicycles and electric bicycles. Their reliability and sensitivity are directly related to people's safety.

[0003] In existing technologies, drum brakes are mostly made of aluminum alloy die-casting for the brake housing. However, to achieve the same strength as a steel brake housing, the aluminum alloy housing must be thickened, leading to an increase in the amount of aluminum used. For example, CN217056065U, a self-adjusting drum brake for electric vehicles, requires a large amount of aluminum for the brake cover. According to national requirements for energy conservation and environmental protection, die-casting of cast alloys will become a restricted process due to high energy consumption and environmental issues, and the price of aluminum alloy materials remains high. Iron drum brakes, such as CN201258068Y, are expansion brakes for light electric motorcycles. When riding at high speeds or under heavy loads, the impact during braking can damage the housing, thus affecting driving safety.

[0004] Therefore, improving existing drum brakes to ensure braking performance, while also being suitable for safe use in fast-moving and heavily loaded vehicles, and achieving environmental protection and energy saving, product optimization, cost reduction, and enhanced market competitiveness has become an urgent task. Utility Model Content

[0005] This utility model provides a drum brake for electric vehicles, which solves the problems that existing drum brakes for electric vehicles cannot be used for safe driving of fast and heavily loaded vehicles, and how to ensure brake performance while reducing product costs, achieving environmental protection and energy saving, optimizing product structure, and enhancing market competitiveness.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model relates to a drum brake for electric vehicles, comprising a brake box assembly, brake shoes, a rocker arm for driving the brake shoes to open and close, and a camshaft. The brake box assembly includes a brake box body, a central sleeve located at the center of the brake box body, cam seats symmetrically arranged on both sides of the central sleeve, and a centering shaft. One end of the camshaft is pivotally connected to the cam seat and detachably connected to the rocker arm on the outside of the brake box assembly. The brake shoes are mounted on the inside of the brake box assembly via the camshaft and the centering shaft. The brake box body near the centering shaft also has a frame limiting structure and a brake cable support structure, one end of which extends outward beyond the brake box body and is correspondingly arranged with the rocker arm.

[0008] Furthermore: the brake box body is configured as a disc-shaped structure, and the outer periphery of the disc-shaped structure is also surrounded by an inwardly folded flange structure. The brake cable support structure includes a support part fixedly connected to the inwardly folded flange structure and a connection hole provided on the support part that is adapted to the brake cable tail sleeve.

[0009] Furthermore, the support portion is also provided with a bending reinforcement portion, one side of which is adapted and connected to the inward folding flange structure.

[0010] Furthermore, the brake cable support structure also includes a fixing part and a transition connection part connecting the fixing part and the support part. The fixing part is fixedly connected to the brake box body through a core-fixing shaft and a limiting structure.

[0011] Furthermore: the fixing part is configured as an arc-shaped fan structure, and the arc-shaped fan structure is also provided with a positioning protrusion, a mounting hole adapted to the centering shaft and a mounting hole groove adapted to the frame limiting structure. The transition connection part is bent upward from one end of the fixing part and extends radially outward along one side of the fixing part to connect with the support part.

[0012] Furthermore: both the brake cable support structure and the brake box body are integral sheet metal structures, and the brake cable support structure and the brake box body are fixed by riveting and / or welding.

[0013] Furthermore: the center of the brake box body is provided with a central shaft hole adapted to the central shaft sleeve, and symmetrically provided on both sides of the central shaft hole are a central shaft hole adapted to the central shaft and a cam shaft hole adapted to the cam seat. The central shaft hole is provided in correspondence with the mounting hole. On one side of the central shaft hole, there is also a limiting through hole adapted to the frame limiting structure and a positioning hole adapted to the fixing part. The positioning hole is provided in correspondence with the positioning protrusion.

[0014] Furthermore: the central shaft hole and the cam shaft hole protrude outward from the outside of the gate box body, and the cam seat is riveted and fixed inside the gate box body.

[0015] Furthermore: the bottom of the frame limiting structure is provided with limiting bosses that are adapted to and correspond to the limiting through holes and mounting slots respectively; the core rotating shaft is riveted and fixed to the brake box body and the fixing part; and the frame limiting structure is a sheet metal integral molding structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This application utilizes common sheet metal stamping, welding, or riveting processes to ensure that the main structure of the gate box is simple, robust, and reliable. Compared with aluminum alloy die-cast gate box shells, it can bear a greater load, and the manufacturing equipment is simple, with lower investment, reducing environmental pollution and overall energy consumption. It also eliminates the equipment and processes that limit the production of aluminum alloy die-casting, thereby optimizing the product structure, reducing costs, and enhancing market competitiveness.

[0018] By setting a support part on the brake cable support structure, and further providing a bent reinforcement part on the support part, which is then welded and fixed to the inward folded flange structure of the brake box body, the stress support of the brake cable support structure is ensured to be stable and the structure is firm.

[0019] By setting a fixing part on the brake cable support structure and fixing the fixing part to the brake box body through the core shaft, the brake cable support structure and the brake box body are firmly connected and the support is stable. It can also improve the ability of the brake cable support structure and the core shaft on the brake box body to withstand greater impact loads without bending, deformation or tearing damage, so that the brake can meet the safety braking requirements of vehicles with high speed and heavy load. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 3 This is an exploded view of the gate box assembly of this utility model;

[0023] Figure 4 This is a three-dimensional structural diagram of the brake line support structure of this utility model.

[0024] Attached image labels:

[0025] Brake box assembly - 10, brake box body - 11, center shaft hole - 112, camshaft hole - 113, center shaft hole - 114, limit through hole - 115, positioning hole - 116, center shaft sleeve - 12, cam seat - 13, center shaft - 14, frame limit structure - 15, limit boss - 151, brake cable support structure - 16, support part - 161, connecting hole - 162, transition connection part - 163, bending reinforcement part - 164, fixing part - 165, mounting hole groove - 166, mounting hole - 167, positioning protrusion - 168, brake shoe - 20, arm - 30, camshaft - 40. Detailed Implementation

[0026] To enhance understanding of this utility model, it will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain this utility model and does not constitute a limitation on the scope of protection of this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the combination or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0029] like Figure 1-4 An embodiment of an electric vehicle drum brake is provided, including a brake box assembly 10, brake shoes 20, a rocker arm 30 for driving the brake shoes 20 to open and close, and a camshaft 40. The brake box assembly 10 includes a brake box body 11, a central bushing 12 disposed at the center of the brake box body 11, cam seats 13 symmetrically disposed on both sides of the central bushing 12, and a centering shaft 14. One end of the camshaft 40 is pivotally connected to the cam seat 13 and detachably connected to the rocker arm 30 on the outside of the brake box assembly 10. The brake shoes 20 are mounted on the inside of the brake box assembly 10 via the camshaft 40 and the centering shaft 14. The brake box body 11 has a central shaft hole 112 adapted to the central bushing 12 at its center, and centering shaft holes 114 adapted to the centering shaft 14 and camshaft holes 113 adapted to the cam seat 13 are symmetrically disposed on both sides of the central shaft hole 112. The brake box body 11 is positioned closer to the centering shaft 14. The system also includes a frame limiting structure 15 and a brake cable support structure 16. The frame limiting structure 15 is fixedly connected to the brake box body 11 through a limiting through hole 115 on one side of the mandrel hole 114. One end of the brake cable support structure 16 is connected to the brake box body 11 on one side of the frame limiting structure 15, and the other end extends outward beyond the brake box body 11 and is correspondingly set with the rocker arm 30. The frame limiting structure 15, the brake cable support structure 16, and the brake box body 11 are all integral sheet metal structures. The central bushing 12, the cam seat 13, the brake cable support structure 16, and the brake box body 11 are fixedly connected to the brake box body 11 by riveting and / or welding. The brake box body 11 is a disc-shaped structure, and the outer periphery of the disc-shaped structure is also surrounded by an inward folded flange structure. The brake cable support structure 16 includes a support part 161 fixedly connected to the inward folded flange structure and a connecting hole 162 on the support part 161 that is adapted to the brake cable tail sleeve. By using common sheet metal stamping, welding, or riveting processes, the main structure of the gate box is ensured to be simple, robust, and reliable. Compared with aluminum alloy die-cast gate box shells, it can bear a greater load, and the manufacturing equipment is simple, the investment is low, reducing environmental pollution and overall energy consumption. The equipment and processes that limit the production of aluminum alloy die-casting are eliminated, thereby optimizing the product structure, reducing costs, and enhancing market competitiveness.

[0030] An alternative implementation: such as Figure 1-4As shown, the support part 161 is also provided with a bending reinforcement part 164. One side of the bending reinforcement part 164 is adapted to the inner folded flange structure and welded and fixed. Preferably, the bending reinforcement part 164 is arranged perpendicularly to the bottom edge of the support part 161 and its inner side is welded and fixed after abutting against the inner folded flange structure of the brake box body 11, so as to ensure that the brake line support structure 16 is stable under stress and the structure is firm.

[0031] An alternative implementation: such as Figure 3-4 As shown, the brake cable support structure 16 also includes a fixing part 165 and a transition connection part 163 connecting the fixing part 165 and the support part 161. The fixing part 165 is fixedly connected to the brake box body 11 through the centering shaft 14 and the limiting structure 15. The setting of the fixing part 165 makes the brake cable support structure 16 and the brake box body 11 firmly connected and stable, and can improve the ability of the brake cable support structure 16 and the centering shaft 14 on the brake box body 11 to withstand greater impact loads without bending, deformation or tearing damage, so that the brake can meet the safety braking requirements of vehicles with high speed and heavy load.

[0032] An alternative implementation: such as Figure 3-4 As shown, the fixing part 165 is designed as an arc-shaped fan structure. The arc-shaped fan structure also includes a positioning protrusion 168, a mounting hole 167 adapted to the core shaft 14, and a mounting groove 166 adapted to the frame limiting structure 15. The mounting hole 167 corresponds to the core shaft hole 114. Preferably, the core shaft 14 passes through the core shaft hole 114 and the mounting hole 167 and is riveted to the brake box body 11 and the fixing part 165, ensuring a firm connection of the fixing part 165 and stable, impact-resistant support for the core shaft 14. The frame limiting structure 165... 5. The bottom is provided with a limiting boss 151, which is adapted to and corresponds to the limiting through hole 115 and the mounting hole groove 166 respectively. When connecting, the connection strength can be strengthened by riveting first and then welding. The transition connection part 163 is bent and protruded from one end of the fixing part 165, and extends radially outward along one side of the fixing part 165 to connect with the support part 161. The side of the core shaft hole 114 is also provided with a positioning hole 116 adapted to the positioning protrusion 168. The positioning protrusion 168 and the positioning hole 116 are used to facilitate the positioning and assembly of the brake cable support structure 16 and the brake box body 11.

[0033] An alternative implementation: such as Figure 2-3 As shown, the central shaft hole 112 and the camshaft hole 113 protrude outward from the outside of the gate box body 11, and the cam seat 13 is riveted and fixed to the inside of the gate box body 11. The central shaft hole 112 and the camshaft hole 113 protrude outward from the outside of the gate box body 11, which increases the overall strength of the gate box body. At the same time, the camshaft hole 113 can also simplify the structure of the cam seat 13, eliminating the need to set protruding structures on both sides of the gate box body, thus saving costs.

[0034] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A drum brake for an electric vehicle, comprising a brake box assembly (10), brake shoes (20), a rocker arm (30) for driving the brake shoes (20) to open and close, and a camshaft (40); the brake box assembly (10) comprises a brake box body (11), a central bushing (12) disposed at the center of the brake box body (11), cam seats (13) symmetrically disposed on both sides of the central bushing (12), and a centering shaft (14); one end of the camshaft (40) is pivotally connected in the cam seat (13) and detachably connected to the rocker arm (30) on the outside of the brake box assembly (10); the brake shoes (20) are mounted on the inside of the brake box assembly (10) via the camshaft (40) and the centering shaft (14); characterized in that: The brake box body (11) is also provided with a frame limiting structure (15) and a brake cable support structure (16) on the side near the center pivot shaft (14). One end of the brake cable support structure (16) extends outward beyond the brake box body (11) and is correspondingly set with the rocker arm (30).

2. The drum brake according to claim 1, characterized in that: The main body (11) of the brake box is configured as a disc-shaped structure, and the outer periphery of the disc-shaped structure is also surrounded by an inner folded flange structure. The brake cable support structure (16) includes a support part (161) fixedly connected to the inner folded flange structure and a connection hole (162) provided on the support part (161) to be adapted to the brake cable tail sleeve.

3. The drum brake according to claim 2, characterized in that: The support part (161) is also provided with a bending reinforcement part (164), one side of which is adapted to and connected to the inner folded flange structure.

4. The drum brake according to claim 3, characterized in that: The brake line support structure (16) further includes a fixing part (165) and a transition connection part (163) connecting the fixing part (165) and the support part (161). The fixing part (165) is fixedly connected to the brake box body (11) through the core rotating shaft (14) and the limiting structure (15).

5. The drum brake according to claim 4, characterized in that: The fixing part (165) is configured as an arc-shaped fan structure. The arc-shaped fan structure is also provided with a positioning protrusion (168), a mounting hole (167) adapted to the centering shaft (14), and a mounting hole groove (166) adapted to the frame limiting structure (15). The transition connection part (163) is bent upward from one end of the fixing part (165) and extends radially outward along one side of the fixing part (165) to connect with the support part (161).

6. The drum brake according to any one of claims 1-5, characterized in that: The brake line support structure (16) and the brake box body (11) are both integral sheet metal structures, and the brake line support structure (16) and the brake box body (11) are fixed by riveting and / or welding.

7. The drum brake according to claim 6, characterized in that: The center of the brake box body (11) is provided with a central shaft hole (112) adapted to the central shaft sleeve (12). On both sides of the central shaft hole (112), there are symmetrically provided a central shaft hole (114) adapted to the central shaft (14) and a cam shaft hole (113) adapted to the cam seat (13). The central shaft hole (114) is correspondingly provided with the mounting hole (167). On one side of the central shaft hole (114), there is also a limiting through hole (115) adapted to the frame limiting structure (15) and a positioning hole (116) adapted to the fixing part (165). The positioning hole (116) is correspondingly provided with the positioning protrusion (168).

8. The drum brake according to claim 7, characterized in that: The central shaft hole (112) and the cam shaft hole (113) protrude outward from the outside of the gate box body (11), and the cam seat (13) is riveted and fixed to the inside of the gate box body (11).

9. The drum brake according to claim 7, characterized in that: The bottom of the frame limiting structure (15) is provided with a limiting boss (151) which is adapted to and corresponds to the limiting through hole (115) and the mounting hole groove (166). The core rotating shaft (14) is riveted and fixed to the brake box body (11) and the fixing part (165). The frame limiting structure (15) is a sheet metal integral molding structure.

Images