Drum brake device for electric vehicle

Abstract

The utility model provides a drum type brake device for an electric vehicle, which comprises a metal block, two brake shoes are oppositely arranged on the metal block, friction materials are arranged on the sides, deviating from each other, of the two brake shoes, a transparent plastic chassis is detachably arranged on the metal block, a driving piece is rotatably arranged on the metal block, and the driving piece is connected with the metal block. One end of the driving part is connected with the brake crank, the other end of the driving part is used for enabling the two brake shoes to be expanded along the sides away from each other, a reset tension spring is arranged between the two brake shoes, and a threading frame is detachably arranged on the metal block. The production cost of the brake disc is greatly reduced under the condition that the brake performance is not affected by the plastic chassis and the metal blocks arranged on the device.

Description

Technical Field

[0001] This utility model relates to the field of braking equipment design technology, and in particular to a drum brake device for electric vehicles. Background Technology

[0002] Drum brakes are a simple vehicle braking system, mainly composed of a brake drum and brake arms. When the brake pedal is pressed, the brake crank rotates, causing the brake shoes to come into contact with the inner wall of the brake drum, generating friction to achieve braking. Most existing battery-powered two-wheeled and three-wheeled vehicles use drum brake systems.

[0003] Existing drum brakes, such as those disclosed in the invention patent with publication number CN112780703A entitled "A Drum Brake Mechanism," include a housing, a brake shaft mounted on the housing, and a brake assembly. The housing also has a rocker arm, one end of which is connected to the brake shaft, and the other end is connected to a brake cable. The brake cable pulls the rocker arm to swing, thereby causing the brake shaft to drive the brake assembly to perform braking. The housing also has a rocker arm reset component, which includes a spring and a limiting component. The spring provides a reset force to the rocker arm after braking ends, and the limiting component limits the spring to extend and retract in a straight line.

[0004] The existing braking systems use brake chassis made of cast metal, which results in high overall quality and high manufacturing costs. Furthermore, the wear of the brake pads cannot be directly observed after the existing brake discs are installed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a drum brake device for electric vehicles, which solves the technical problems mentioned in the background art regarding the high production cost and difficulty in observing the wear of brake pads in existing brake devices.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A drum brake device for electric vehicles includes a metal block with two brake shoes facing each other on the metal block. Friction material is provided on the opposite side of each brake shoe. A transparent plastic chassis is detachably mounted on the metal block. A drive member is rotatably mounted on the metal block. One end of the drive member is connected to a brake crank, and the other end of the drive member is used to cause the two brake shoes to expand apart along the opposite side. A return spring is provided between the two brake shoes. A cable guide is detachably mounted on the metal block.

[0008] By adopting the above technical solution, the set drive component can effectively drive the brake crank to rotate when the brake pedal is pressed, so that the drive component connected to the brake crank drives the two brake shoes to expand in a direction away from each other on the metal block, and rub against the external brake drum to achieve braking. The set transparent plastic chassis not only makes it easy to directly observe the wear of the brake pads, but also helps to reduce the overall weight and production cost of the braking device.

[0009] The present invention is further configured such that: an installation hole is provided at the center of the plastic chassis shaft, and a metal sleeve with both ends passing through is fixed on the metal block, one end of the metal sleeve sliding through the installation hole.

[0010] By adopting the above technical solution, the combination of the metal sleeve and the mounting hole facilitates the connection and fixation of the metal block to the frame.

[0011] The present invention is further configured such that: a positioning block is fixed on the plastic chassis, a positioning groove is provided on the metal block, the positioning block slides against the side wall of the positioning groove, and a plurality of buckles are provided on the plastic chassis and on both sides of the metal block, and the plurality of buckles abut against the side wall and top surface of the metal block.

[0012] By adopting the above technical solution, the positioning slot and positioning block can facilitate the positioning of the metal sleeve on the plastic chassis, and the buckle can effectively fix the metal block on the plastic chassis.

[0013] The present invention is further configured such that: a first reinforcing rib is fixed on the side of the positioning block away from the metal block, and a second reinforcing rib is provided on the side of each of the several buckles away from the metal block.

[0014] By adopting the above technical solution, the first reinforcing rib and several second reinforcing ribs can effectively increase the limiting and locking strength of the positioning block and several buckles on the metal sleeve.

[0015] The present invention is further configured such that: a plurality of mounting blocks are provided on the plastic chassis and on both sides of the metal block; a plurality of mounting slots corresponding one-to-one with the mounting blocks are provided on the metal block; the plurality of mounting blocks slide against the side walls of the corresponding plurality of mounting slots; a connecting block is provided on the plastic chassis and on both sides of the metal block; a connecting hole is provided on each of the two connecting blocks; and two snap-fit ​​parts are slidably provided on the metal block and respectively snap into the two connecting holes.

[0016] By adopting the above technical solution, the installation block and the corresponding installation slots and buckles are used to position the metal block, and the metal block is fixedly snapped between the two connecting blocks by the snap-fit ​​component.

[0017] The present invention is further configured such that: the snap-fit ​​component includes a snap-fit ​​rod and a spring; a snap-fit ​​groove is provided in the metal block; a snap-fit ​​hole corresponding to the connection hole is provided on the side wall of the snap-fit ​​groove; the snap-fit ​​rod is disposed in the snap-fit ​​groove; one end of the snap-fit ​​groove slides through the snap-fit ​​hole and extends into the connection hole; the spring is disposed in the snap-fit ​​groove and is fixedly connected to the side wall of the snap-fit ​​groove and the end of the snap-fit ​​rod, respectively.

[0018] By adopting the above technical solution, the locking rod is extended into the connecting hole by the thrust of the spring, and the metal block and the plastic base are fixed together.

[0019] The present invention is further configured such that: the metal block is provided with an elongated sliding hole, the extension direction of the sliding hole is parallel to the sliding direction of the locking rod, a slider is provided in the sliding hole, and one end of the slider is fixedly connected to the top of the locking rod.

[0020] By adopting the above technical solution, this setting can effectively allow the slider to slide within the sliding hole and drive the locking rod to slide within the locking hole, making it easy for the locking rod to extend out of the connection hole and complete the disassembly of the metal block from the plastic chassis.

[0021] The present invention is further configured such that: each of the plurality of mounting blocks is provided with a third reinforcing rib on the side away from the metal block, and each of the two connecting blocks is provided with a fourth reinforcing rib on the side away from the metal block.

[0022] By adopting the above technical solution, the addition of several third reinforcing ribs and two fourth reinforcing ribs effectively increases the connection strength between the mounting block and the connecting block on the plastic chassis.

[0023] Beneficial effects achieved:

[0024] This device is a drum brake for electric vehicles, mainly used for installation on electric vehicles to provide braking. The metal block and plastic chassis allow for effective observation of the wear of the brake shoes on the metal block through the plastic chassis. Furthermore, the detachable plastic chassis facilitates maintenance or replacement of the internal components of the brake device, significantly reducing operating costs compared to existing all-metal chassis. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0026] Figure 2 for Figure 1 Explosion-proof diagram of the structure;

[0027] Figure 3 This is a schematic diagram of the connection structure between the plastic chassis and the metal block in Example 1.

[0028] Figure 4A schematic diagram of the connection structure between the plastic chassis and the metal block for implementation two;

[0029] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A;

[0030] Figure 6 for Figure 5 A schematic diagram of the structural cross-section of the viewpoint.

[0031] In the above attached figures: 1. Plastic chassis; 2. Metal block; 3. Brake shoe; 4. Friction material; 5. Brake crank; 6. Return spring; 7. Cable guide; 8. Mounting hole; 9. Metal sleeve; 10. Positioning block; 11. Positioning groove; 12. Buckle; 13. First reinforcing rib; 14. Second reinforcing rib; 15. Mounting block; 16. Mounting groove; 17. Connecting block; 18. Connecting hole; 19. Snap-fit ​​rod; 20. Spring; 21. Snap-fit ​​groove; 22. Snap-fit ​​hole; 23. Sliding hole; 24. Slider; 25. Third reinforcing rib; 26. Fourth reinforcing rib; 27. Positioning shaft; 28. Rotating shaft. Detailed Implementation

[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0033] Example 1:

[0034] Reference Figures 1-3This utility model relates to a drum brake device for electric vehicles, comprising a metal block 2 made of aluminum alloy or cast iron. Two brake shoes 3 are arranged opposite each other on the metal block 2. Friction material 4 is provided on the opposite side of each brake shoe 3. This friction material 4 is a material commonly used in existing brakes, and will not be described in detail here. A transparent plastic chassis 1 is detachably mounted on the metal block 2. This plastic chassis 1 can be made of PP material. A mounting hole 8 is provided at the center of the plastic chassis 1. A metal sleeve 9 with both ends passing through it is fixed to the metal block 2. One end of the metal sleeve 9 slides through the mounting hole 8. This arrangement facilitates connection to an external vehicle frame via the metal sleeve 9. A positioning block 10 is fixedly mounted on the plastic base 1, and a positioning slot 11 is provided on the metal block 2. The positioning block 10 slides against the side wall of the positioning slot 11. Several buckles 12 are provided on both sides of the metal block 2 on the plastic base 1. Each buckle 12 abuts against the side wall and top surface of the metal block 2. A first reinforcing rib 13 is fixedly mounted on the side of the positioning block 10 facing away from the metal block 2, and a second reinforcing rib 14 is provided on the side of each buckle 12 facing away from the metal block 2. The combination of the positioning block 10 and the positioning slot 11 allows the metal block 2 to be positioned on the plastic base 1. The buckles 12 facilitate the snapping operation of the metal block 2. These buckles 12 are also made of plastic and have a certain degree of elasticity, abutting against the side wall and top surface of the metal block 2 during use.

[0035] A driving component is rotatably mounted on the metal block 2. One end of the driving component is connected to the brake crank 5, and the other end is used to cause the two brake shoes 3 to expand apart along their opposite sides. The driving component includes a positioning shaft 27 and a rotating shaft. The positioning shaft 27 is fixed to the plastic chassis 1 and slides through the metal block 2. The opposite ends of the two brake shoes 3 abut against the side wall of the positioning shaft 27 and rotate around the positioning shaft 27. The rotating shaft is rotatably mounted on the metal block 2, and one end of the rotating shaft is block-shaped and abuts against the ends of the two brake shoes 3 away from the positioning shaft 27. The other end of the rotating shaft slides through the plastic chassis 1 and is fixedly connected to one end of the brake crank 5. A return spring 6 is provided between the two brake shoes 3. A wire threader 7 is detachably mounted on the metal block 2 and is detachably connected to the metal block 2 by bolts.

[0036] Working principle:

[0037] During installation, the metal block 2 is first connected to the plastic chassis 1. Specifically, the metal sleeve 9 on the metal block 2 is first inserted into the mounting hole 8, and then the positioning slot 11 on the metal block 2 is aligned with the positioning block 10 on the plastic chassis 1. Then, the metal block 2 is snapped onto the plastic chassis 1. Next, the brake shoe 3 and the tension spring are installed in sequence. Finally, the metal sleeve 9 on the metal block 2 is connected to the frame. During the installation process, the brake drum is directly installed on the frame, and the plastic chassis 1 is placed on top of it. The plastic chassis 1 has no other connection with the brake drum.

[0038] Example 2:

[0039] The difference between Embodiment 2 and Embodiment 1 is that: The plastic base 1 has several mounting blocks 15 on both sides of the metal block 2; the metal block 2 has several mounting slots 16 corresponding to the mounting blocks 15; the mounting blocks 15 slide against the sidewalls of the corresponding mounting slots 16; the plastic base 1 has connecting blocks 17 on both sides of the metal block 2; each connecting block 17 has a connecting hole 18; and two connecting holes slidably connect to the metal block 2. The metal block 2 has a locking component that engages with the two connecting holes 18. The locking component includes a locking rod 19 and a spring 20. A locking groove 21 is formed within the metal block 2. A locking hole 22 corresponding to the connecting hole 18 is formed on the side wall of the locking groove 21. The locking rod 19 is located within the locking groove 21. One end of the locking groove 21 slides through the locking hole 22 and extends into the connecting hole 18. The spring 20 is located within the locking groove 21 and is fixedly connected to both the side wall of the locking groove 21 and the end of the locking rod 19. The metal block 2 has an elongated sliding hole 23. The extension direction of the sliding hole 23 is parallel to the sliding direction of the locking rod 19. A slider 24 is located within the sliding hole 23, and one end of the slider 24 is fixedly connected to the top of the locking rod 19. Several mounting blocks 15 each have a third reinforcing rib 25 on the side opposite to the metal block 2, and two connecting blocks 17 each have a fourth reinforcing rib 26 on the side opposite to the metal block 2. This configuration allows the slider 24 to effectively move the locking rod 19 within the locking hole 22, enabling connection and separation with the connection hole 18. This facilitates the installation and removal of the metal block 2 from the plastic chassis 1.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A drum brake device for electric vehicles, characterized in that: The device includes a metal block (2), on which two brake shoes (3) are provided opposite each other. Friction material (4) is provided on the opposite side of the two brake shoes (3). A transparent plastic chassis (1) is detachably provided on the metal block (2). A drive member is rotatably provided on the metal block (2). One end of the drive member is connected to the brake crank (5). The other end of the drive member is used to cause the two brake shoes (3) to expand along the opposite side. A return spring (6) is provided between the two brake shoes (3). A wire guide (7) is detachably provided on the metal block (2).

2. The drum brake device for electric vehicles according to claim 1, characterized in that: The plastic chassis (1) has an installation hole (8) at its axis, and a metal sleeve (9) with both ends passing through it is fixed on the metal block (2). One end of the metal sleeve (9) slides through the installation hole (8).

3. The drum brake device for electric vehicles according to claim 1, characterized in that: A positioning block (10) is fixed on the plastic chassis (1), and a positioning groove (11) is provided on the metal block (2). The positioning block (10) slides against the side wall of the positioning groove (11). Several buckles (12) are provided on the plastic chassis (1) and on both sides of the metal block (2). Several buckles (12) abut against the side wall and top surface of the metal block (2).

4. A drum brake device for an electric vehicle according to claim 3, characterized in that: The positioning block (10) is fixed with a first reinforcing rib (13) on the side away from the metal block (2), and each of the several buckles (12) is provided with a second reinforcing rib (14) on the side away from the metal block (2).

5. A drum brake device for an electric vehicle according to claim 1, characterized in that: The plastic chassis (1) is provided with a number of mounting blocks (15) on both sides of the metal block (2). The metal block (2) is provided with a number of mounting slots (16) that correspond one-to-one with the mounting blocks (15). The mounting blocks (15) slide against the side walls of the corresponding mounting slots (16). The plastic chassis (1) is provided with a connecting block (17) on both sides of the metal block (2). Both connecting blocks (17) are provided with connecting holes (18). The metal block (2) is provided with two snap-fit ​​parts that are respectively snapped into the two connecting holes (18).

6. A drum brake device for an electric vehicle according to claim 5, characterized in that: The snap-fit ​​component includes a snap-fit ​​rod (19) and a spring (20). A snap-fit ​​groove (21) is provided in the metal block (2). A snap-fit ​​hole (22) corresponding to the connecting hole (18) is provided on the side wall of the snap-fit ​​groove (21). The snap-fit ​​rod (19) is located in the snap-fit ​​groove (21). One end of the snap-fit ​​groove (21) slides through the snap-fit ​​hole (22) and extends into the connecting hole (18). The spring (20) is located in the snap-fit ​​groove (21) and is fixedly connected to the side wall of the snap-fit ​​groove (21) and the end of the snap-fit ​​rod (19), respectively.

7. A drum brake device for an electric vehicle according to claim 6, characterized in that: The metal block (2) is provided with an elongated sliding hole (23), the extension direction of the sliding hole (23) is parallel to the sliding direction of the snap-fit ​​rod (19), and a slider (24) is provided inside the sliding hole (23), one end of the slider (24) is fixedly connected to the top of the snap-fit ​​rod (19).

8. A drum brake device for an electric vehicle according to claim 5, characterized in that: Each of the mounting blocks (15) is provided with a third reinforcing rib (25) on the side away from the metal block (2), and each of the two connecting blocks (17) is provided with a fourth reinforcing rib (26) on the side away from the metal block (2).

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