Electric vehicle drum brake with cam rotating along with brake rod

Abstract

The electric vehicle drum brake with the cam rotating along with the brake rod comprises a cover body, the cover body is connected with two connecting discs in a rotating mode through a rotating rod, the outer surfaces of the two connecting discs are fixedly connected with brake pads, and the sides, close to each other, of the connecting discs are elastically connected in a hanging mode through a tension spring. When a new cam body needs to be replaced, a user only needs to disassemble the cover body, insert the second connecting rod into the connecting cylinder and slide the guide block on the inner surface of the guide groove, when the guide block slides to the deepest depth of the guide groove, namely, when the guide block is not pushed, the second connecting rod is rotated clockwise, and then the guide block slides on the inner surface of the annular groove; after the cam body is rotated by 90 degrees, namely when the first threaded hole corresponds to the second threaded hole, the second connecting rod and the connecting cylinder are connected only by connecting the mounting bolt with the inner surface of the first threaded hole and the inner surface of the second threaded hole in a threaded mode, then the brake rod body and the cam body are connected, only the cam body needs to be replaced, and finally the cover body is mounted.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric vehicle drum brakes, in particular to an electric vehicle drum brake whose cam rotates with a brake rod. Background Art

[0002] Electric vehicle drum brakes are a relatively simple and traditional braking method, commonly found on rear wheels. The braking principle is to reduce the vehicle speed until it reaches a standstill through the friction between the stationary brake pads in the brake drum and the rotating brake drum.

[0003] During braking, the brake lever drives the cam connected to it to prop up the bump on the brake disc hinge, thereby causing friction between the brake pad and the brake drum. Since the cam acts as a fulcrum and is a consumable part, the brake disc needs to be removed and replaced as a whole during maintenance and replacement, which causes inconvenience in installation and reduces the utilization rate of the drum brake. For this reason, we propose an electric vehicle drum brake in which the cam rotates with the brake lever. The above-mentioned shortcomings can be solved by only removing and replacing the cam. Utility Model Content

[0004] The utility model aims to provide an electric vehicle drum brake whose cam rotates with the brake rod, which is convenient for installing the cam, thereby improving the utilization rate of the drum brake and solving the above-mentioned background technical problems.

[0005] The utility model solves the above-mentioned technical problem with the following technical solution: an electric vehicle drum brake whose cam rotates with the brake rod, comprising a cover body, the cover body being rotatably connected to two connecting plates through a rotating rod, the outer surfaces of the two connecting plates being fixedly connected to brake pads, the adjacent sides of the connecting plates being elastically hung by tension springs, a brake rod body being arranged on the back of the cover body, a connecting rod one being fixedly connected to the front side of the brake rod body, the surface of the connecting rod one passing through the cover body and being rotatably supported by a bearing seat, the outer surface of the bearing seat being embedded and fixedly connected to the cover body, and a connecting tube being fixedly connected to the side of the connecting rod one away from the brake rod body. The inner surface of the connecting tube is provided with a guide groove in a transverse direction, and an annular groove connected with the guide groove is provided on one side of the inner cavity of the connecting tube. A connecting rod 2 is slidably provided on the inner surface of the connecting tube, and a guide block is fixedly connected to the surface of the connecting rod 2. The outer surface of the guide block is slidably connected to the inner surface of the guide groove. When the guide block rotates clockwise, it is slidably connected to the inner surface of the annular groove. A through threaded hole 1 is provided on the outer surface of the connecting rod 2, and a threaded hole 2 is provided on the outer surface of the connecting tube. The inner surfaces of the threaded hole 1 and the threaded hole 2 are threadedly connected with mounting bolts, and a cam body is fixedly connected to the surface of the connecting rod 2.

[0006] Preferably, a protrusion is fixedly connected to the bottom of the adjacent side of the two connecting plates, and the outer surface of the protrusion and the outer surface of the cam body are fitted and slidable with each other.

[0007] Preferably, an axial hole is provided at the axial center of the cover body.

[0008] Preferably, the annular groove is annularly provided on one side of the inner cavity of the connecting tube, and the annular groove and the guide groove are designed to be 90 degrees to each other.

[0009] Preferably, the initial positions of the threaded hole 1 and the threaded hole 2 are designed to be 90 degrees to each other with the axis point of the connecting tube, and after rotating 90 degrees clockwise, the threaded hole 1 and the threaded hole 2 correspond to each other.

[0010] 1. The beneficial effect of the utility model is that when a new cam body needs to be replaced, the cover body only needs to be removed, and the connecting rod 2 is inserted into the connecting tube, and the guide block slides on the inner surface of the guide groove. When the guide block slides to the deepest depth of the guide groove, that is, when the guide block cannot be pushed, the connecting rod 2 is rotated clockwise, and the guide block slides on the inner surface of the annular groove. After rotating ninety degrees, that is, when the threaded hole 1 corresponds to the threaded hole 2, at this time, it is only necessary to thread the mounting bolts with the inner surfaces of the threaded hole 1 and the threaded hole 2, so as to complete the connection between the connecting rod 2 and the connecting tube, and then complete the connection between the brake rod body and the cam body, so that only the cam body needs to be replaced, and finally the cover body is installed. By setting the above structure, it is convenient to install the cam, thereby improving the utilization rate of the drum brake.

[0011] 2. The utility model provides a convex block which can cooperate with the cam body, so as to lift up the connecting plates on both sides, thereby achieving the function of lifting up the brake pad.

[0012] 3. The utility model sets the initial positions of the threaded hole 1 and the threaded hole 2 so that the axis points of the connecting tube are 90 degrees to each other. After rotating 90 degrees clockwise, the threaded hole 1 and the threaded hole 2 correspond to each other, so that the positions of the threaded hole 1 and the threaded hole 2 can be quickly matched, which is convenient for inserting the installation bolt, thereby reducing the time for finding the corresponding holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] in:

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the brake lever and cam structure of the utility model;

[0016] Figure 3 It is a partial enlarged view of point A of the utility model;

[0017] Figure 4It is a schematic diagram of the ring groove structure of the utility model.

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

[0019] 1. Cover body; 2. Rotating rod; 3. Connecting plate; 4. Brake pad; 5. Tension spring; 6. Brake rod body; 7. Connecting rod 1; 8. Bearing seat; 9. Connecting tube; 10. Guide groove; 11. Connecting rod 2; 12. Threaded hole 1; 13. Guide block; 14. Threaded hole 2; 15. Mounting bolt; 16. Ring groove; 17. Cam body; 18. Shaft hole; 19. Bump. DETAILED DESCRIPTION

[0020] Hereinafter, an embodiment of an electric vehicle drum brake in which a cam rotates with a brake lever according to the present invention will be described with reference to the accompanying drawings.

[0021] Example:

[0022] Figure 1-4The utility model shows an electric vehicle drum brake in which the cam rotates with the brake rod of an embodiment of the utility model, comprising a cover body 1, an axial hole 18 is opened at the axis center of the cover body 1, the cover body 1 is rotatably connected to two connecting plates 3 through a rotating rod 2, the outer surfaces of the two connecting plates 3 are fixedly connected to brake pads 4, and the adjacent sides of the connecting plates 3 are elastically hung through a tension spring 5, a brake rod body 6 is arranged on the back of the cover body 1, a connecting rod 7 is fixedly connected to one side of the front of the brake rod body 6, the surface of the connecting rod 7 passes through the cover body 1 and is rotatably supported by a bearing seat 8, the outer surface of the bearing seat 8 is embedded and fixedly connected to the cover body 1, a connecting tube 9 is fixedly connected to the side of the connecting rod 7 away from the brake rod body 6, a guide groove 10 is opened in a transverse manner on the inner surface of the connecting tube 9, and a guide groove 10 is opened on one side of the inner cavity of the connecting tube 9 An annular groove 16 connected to the groove 10 is annularly arranged on one side of the inner cavity of the connecting tube 9. The annular groove 16 and the guide groove 10 are designed to be 90 degrees to each other. A connecting rod 2 11 is slidably arranged on the inner surface of the connecting tube 9. A guide block 13 is fixedly connected to the surface of the connecting rod 2 11. The outer surface of the guide block 13 is slidably connected to the inner surface of the guide groove 10. The guide block 13 is slidably connected to the inner surface of the annular groove 16 when rotating clockwise. A through threaded hole 12 is arranged on the outer surface of the connecting rod 2 11. A threaded hole 2 14 is arranged on the outer surface of the connecting tube 9. The inner surfaces of the threaded hole 12 and the threaded hole 2 14 are threadedly connected with mounting bolts 15. The initial positions of the threaded hole 12 and the threaded hole 2 14 are designed to be 90 degrees to each other with the axis point of the connecting tube 9. After rotating ninety degrees clockwise, the threaded hole 12 and the threaded hole 2 14 correspond to each other. By setting the initial positions of the threaded hole 12 and the threaded hole 2 14 to be ninety degrees to each other with the axis points of the connecting tube 9, after rotating ninety degrees clockwise, the threaded hole 12 and the threaded hole 2 14 correspond to each other, so that the positions of the threaded hole 12 and the threaded hole 2 14 can be quickly matched, which is convenient for the insertion of the installation bolt 15, thereby reducing the time for finding the corresponding holes. The surface of the connecting rod 2 11 is fixedly connected with a cam body 17, and the bottom of the two connecting plates 3 on the side close to each other is fixedly connected with a protrusion 19, and the outer surface of the protrusion 19 and the outer surface of the cam body 17 fit and slide with each other. By setting the protrusion 19, it can cooperate with the cam body 17, so that the connection on both sides of the jacking The receiving plate 3 can lift up the brake pad 4. When a new cam body 17 needs to be replaced, the cover body 1 only needs to be removed, and the connecting rod 11 is inserted into the connecting tube 9, and the guide block 13 slides on the inner surface of the guide groove 10. When the guide block 13 slides to the deepest depth of the guide groove 10, that is, when the guide block 13 cannot be pushed, the connecting rod 11 is rotated clockwise, and the guide block 13 slides on the inner surface of the annular groove 16. After rotating ninety degrees, that is, when the threaded hole 12 corresponds to the threaded hole 14, at this time, it is only necessary to thread the mounting bolt 15 with the inner surface of the threaded hole 12 and the threaded hole 14, so as to complete the connection between the connecting rod 11 and the connecting tube 9, and then complete the connection between the brake rod body 6 and the cam body 17.Therefore, only the cam body 17 needs to be replaced, and finally the cover body 1 is installed. By setting the above structure, the cam can be easily installed, thereby improving the utilization rate of the drum brake.

[0023] Working principle: When the utility model is used, the brake rod body 6 drives the connecting rod 1 7 to rotate inside the bearing seat 8, thereby driving the connecting rod 2 11 connected to its connecting tube 9 to rotate, and then driving the cam body 17 to lift the corresponding protrusions 19, and finally lift the connecting plate 3, and stretch the tension spring 5. The connecting plate 3 rotates with the rotating rod 2 as the rotation point, thereby lifting the brake pad 4 and rubbing against the brake drum to achieve the braking effect.

[0024] When it is necessary to replace the cam body 17 with a new one, it is only necessary to remove the cover body 1, insert the connecting rod 2 11 into the connecting tube 9, and slide the guide block 13 on the inner surface of the guide groove 10. When the guide block 13 slides to the deepest depth of the guide groove 10, that is, when the guide block 13 cannot be pushed, rotate the connecting rod 2 11 clockwise. At this time, the guide block 13 slides on the inner surface of the annular groove 16. After rotating ninety degrees, that is, when the threaded hole 12 corresponds to the threaded hole 2 14, at this time, it is only necessary to thread the mounting bolt 15 with the inner surface of the threaded hole 12 and the threaded hole 2 14 to complete the connection between the connecting rod 2 11 and the connecting tube 9, and then complete the connection between the brake rod body 6 and the cam body 17. Only the cam body 17 needs to be replaced, and finally the cover body 1 is installed, which is convenient for installing the cam and improving the utilization rate of the drum brake.

Claims

1. An electric vehicle drum brake with a cam rotating with a brake lever, comprising a cover body (1), wherein the cover body (1) is rotatably connected to two connecting plates (3) via a rotating rod (2), the outer surfaces of the two connecting plates (3) are fixedly connected with brake pads (4), and the adjacent sides of the connecting plates (3) are elastically connected via a tension spring (5), characterized in that: A brake rod body (6) is arranged on the back of the cover body (1), and a connecting rod (7) is fixedly connected to one side of the front of the brake rod body (6). The surface of the connecting rod (7) passes through the cover body (1) and is rotatably supported by a bearing seat (8). The outer surface of the bearing seat (8) is embedded and fixedly connected to the cover body (1). A connecting tube (9) is fixedly connected to the side of the connecting rod (7) away from the brake rod body (6). A guide groove (10) is horizontally provided on the inner surface of the connecting tube (9). An annular groove (16) connected to the guide groove (10) is provided on one side of the inner cavity of the connecting tube (9). The inner surface of the connecting tube (9) slides A connecting rod 2 (11) is provided, and a guide block (13) is fixedly connected to the surface of the connecting rod 2 (11), and the outer surface of the guide block (13) is slidably connected to the inner surface of the guide groove (10). When the guide block (13) rotates clockwise, it is slidably connected to the inner surface of the annular groove (16). A through threaded hole 1 (12) is provided on the outer surface of the connecting rod 2 (11), and a threaded hole 2 (14) is provided on the outer surface of the connecting tube (9). The inner surfaces of the threaded hole 1 (12) and the threaded hole 2 (14) are threadedly connected with mounting bolts (15), and a cam body (17) is fixedly connected to the surface of the connecting rod 2 (11).

2. The electric vehicle drum brake with a cam rotating with a brake lever according to claim 1, characterized in that: A protrusion (19) is fixedly connected to the bottom of the adjacent side of the two connection plates (3), and the outer surface of the protrusion (19) and the outer surface of the cam body (17) fit and slide against each other.

3. The electric vehicle drum brake with a cam rotating with a brake lever according to claim 1, characterized in that: An axial hole (18) is provided at the axial center of the cover body (1).

4. The electric vehicle drum brake with a cam rotating with a brake lever according to claim 1, characterized in that: The annular groove (16) is formed in an annular shape and is arranged on one side of the inner cavity of the connecting tube (9). The annular groove (16) and the guide groove (10) are designed to be 90 degrees apart from each other.

5. The electric vehicle drum brake with a cam rotating with a brake lever according to claim 1, characterized in that: The initial positions of the threaded hole 1 (12) and the threaded hole 2 (14) are designed to be 90 degrees relative to each other with the axis point of the connecting tube (9). After rotating 90 degrees clockwise, the threaded hole 1 (12) and the threaded hole 2 (14) correspond to each other.

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