Brake device
By introducing an adjustment assembly for the pawl and ratchet components into the braking system, the problem of needing a greater distance to fit the wheel hub after the shoe assembly wears out is solved, thus achieving a braking system design that maintains good braking performance under wear conditions.
Patent Information
- Application Number
- CN202423111419.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-17
AI Technical Summary
In existing technologies, after the shoe block assembly wears down, it needs to travel a greater distance to make contact with the wheel hub, which affects the braking effect of the braking device.
The brake device design includes a shoe block assembly, a cam component, a rocker arm, and an adjustment component. Through the cooperation of the pawl and ratchet components, the initial position of the cam component is adjusted to ensure that the distance between the shoe block assembly and the wheel hub does not increase, thus maintaining good braking performance.
After the shoe block assembly wears down, the initial position of the cam is automatically adjusted by the adjustment component to ensure that the distance between the shoe block assembly and the wheel hub remains unchanged, thus maintaining good braking performance. Effective braking can be achieved without increasing the movement distance of the shoe block assembly.
Smart Images
Figure CN223533626U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle braking technology, and in particular to a braking device. Background Technology
[0002] In two-wheeled vehicles such as bicycles and electric bicycles, the braking effect of the braking system has a significant impact on the vehicle's safety performance. Drum brakes are one type of braking system, which generally achieves braking by moving a shoe assembly to make it contact the wheel hub. After a period of use, the shoe assembly will experience some wear, requiring the shoe assembly to move a greater distance to make it contact the wheel hub, thus affecting the braking effect of the braking system. Utility Model Content
[0003] The purpose of this invention is to provide a braking device that aims to solve the problem that wear of the shoe assembly 10 affects the braking effect in the prior art.
[0004] This application provides a braking device, including a shoe block assembly (10), a cam (20), a rocker arm (30), and an adjustment assembly (40). One end of the cam (20) abuts against the shoe block assembly (10), and the other end of the cam (20) is connected to the rocker arm (30). The adjustment assembly (40) is mounted on the rocker arm (30) and includes a ratchet (41) and a pawl (42) engaged with the ratchet (41). The ratchet (41) is mounted on the cam (20) and is used to rotate synchronously with the rocker arm (30) under the action of the pawl (42) to drive the cam (20) to move in the braking direction. The pawl (42) is used to drive the ratchet (41) to rotate a preset angle when the rocker arm (30) moves to a preset position to adjust the initial position of the cam (20) moving in the braking direction.
[0005] In one embodiment, the pawl (42) includes a first pawl (421) and a second pawl (422). The first pawl (421) is used to drive the ratchet (41) to rotate when the rocker arm (30) moves to a preset position. The second pawl (422) is used to disengage from the ratchet (41) when the ratchet (41) rotates, and to re-engage on the ratchet (41) after the ratchet (41) has rotated a preset angle.
[0006] In one embodiment, the first pawl (421) includes a pawl portion (4211) and a drive portion (4212) connected to the pawl portion (4211). The drive portion (4212) is used to abut against a limiting member (51) when the rocker arm (30) moves to a preset position, so as to drive the pawl portion (4211) to move.
[0007] In one embodiment, the first pawl (421) further includes a connecting portion (4213) connected between the driving portion (4212) and the pawl portion (4211).
[0008] In one embodiment, one end of the connecting part (4213) is rotatably connected to the pawl part (4211), and the other end of the connecting part (4213) is rotatably connected to the rocker arm (30).
[0009] In one embodiment, the braking device further includes a housing (50), the cam member (20) passing through the housing (50), the shoe assembly (10) located inside the housing (50), and the rocker arm (30) and the adjusting assembly (40) located outside the housing (50).
[0010] In one embodiment, the limiting member (51) protrudes from the housing (50).
[0011] In one embodiment, the braking device further includes a first elastic element disposed between the housing (50) and the rocker arm (30) to provide a restoring torque to the rocker arm (30).
[0012] In one embodiment, the braking device further includes a second elastic element disposed between the rocker arm (30) and the second pawl (422) to provide a restoring torque to the second pawl (422).
[0013] In one embodiment, the ratchet member (41) has a square hole (411) and the ratchet member (41) is mounted on the cam member (20) through the square hole (411).
[0014] The beneficial effects of the braking device provided by this utility model are as follows: The braking device includes a shoe block assembly 10, a cam member 20, a rocker arm 30, and an adjustment component 40. The adjustment component 40 is mounted on the rocker arm 30 and includes a ratchet member 41 and a pawl member 42 engaged with the ratchet member 41. The ratchet member 41 is mounted on the cam member 20 and is used to rotate synchronously with the rocker arm 30 under the action of the pawl member 42, so as to drive the cam member 20 to move in the braking direction, thereby driving the shoe block assembly 10 to move in the braking direction, thus achieving braking. When the shoe block assembly 10 wears, the distance between the shoe block assembly 10 and the wheel hub increases, and the rocker arm 30 needs to drive the shoe block assembly 10 to move a greater distance to make the shoe block assembly 10 contact the wheel hub, thereby moving the rocker arm 30 to a preset position. The pawl 42 drives the ratchet 41 to rotate by a preset angle when the rocker arm 30 moves to a preset position, thereby adjusting the initial position of the cam 20 in the braking direction. This allows for adjustment of the initial position of the cam 20 even when the shoe assembly 10 is worn, thus adjusting the initial position of the shoe assembly 10 and preventing an increase in the distance between the shoe assembly 10 and the wheel hub. During the next braking operation, since the distance between the shoe assembly 10 and the wheel hub does not increase, braking can be achieved without increasing the movement distance of the shoe assembly 10, ensuring that the braking effect is not affected even when the shoe assembly 10 is worn. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 A schematic diagram of the braking device provided in an embodiment of this utility model;
[0017] Figure 2 A schematic diagram of the braking device provided in an embodiment of this utility model from another perspective;
[0018] Figure 3 A schematic diagram of the braking device provided in this embodiment of the present invention when the shoe assembly is worn;
[0019] Figure 4 An exploded view of the braking device provided in an embodiment of this utility model;
[0020] Figure 5 A schematic diagram of the first pawl provided in an embodiment of this utility model.
[0021] The following are the labeling elements in the figure:
[0022] 10. Shoe assembly; 11. Brake shoe; 20. Cam component; 30. Rocker arm; 40. Adjustment component; 41. Ratchet component; 411. Square hole; 42. Pawl component; 421. First pawl; 4211. Pawl part; 4212. Drive part; 4213. Connecting part; 422. Second pawl; 50. Housing; 51. Limiting component. Detailed Implementation
[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0024] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.
[0025] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 device 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.
[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.
[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0028] Please refer to Figures 1 to 5 The braking device in the embodiments of this utility model will now be described.
[0029] like Figure 1 As shown, the braking device includes a shoe block assembly 10, a cam member 20, a rocker arm 30, and an adjustment assembly 40. One end of the cam member 20 abuts against the shoe block assembly 10, and the other end of the cam member 20 is connected to the rocker arm 30. The adjustment assembly 40 is mounted on the rocker arm 30 and includes a ratchet member 41 and a pawl member 42 engaged with the ratchet member 41. The ratchet member 41 is mounted on the cam member 20 and is used to rotate synchronously with the rocker arm 30 under the action of the pawl member 42 to drive the cam member 20 to move in the braking direction. The pawl member 42 is used to drive the ratchet member 41 to rotate a preset angle when the rocker arm 30 moves to a preset position to adjust the initial position of the cam member 20 moving in the braking direction.
[0030] Specifically, one end of the rocker arm 30 is connected to the cam member 20, and the other end is connected to the brake cable. By pulling the brake cable, the rocker arm 30 can be moved, thereby causing the cam member 20 to move in the braking direction. The movement of the cam member 20 in the braking direction will drive the shoe assembly 10 to move in the braking direction, thereby causing the shoe assembly 10 to contact the wheel hub and brake the wheel hub. During the movement of the rocker arm 30, the adjusting component 40 rotates synchronously with the rocker arm 30. The rocker arm 30 can drive the cam member 20 to move by driving the adjusting component 40, or it can directly drive the cam member 20 to move. The movement of the rocker arm 30 can be either a circumferential rotation or a linear sliding. The movement of the cam member 20 in the braking direction can also be either a circumferential rotation or a linear sliding.
[0031] When the shoe block assembly 10 wears down, the distance between the shoe block assembly 10 and the wheel hub increases. During the process of the rocker arm 30 driving the cam 20 to move, and consequently driving the shoe block assembly 10 to move, the rocker arm 30 needs to move a greater distance to bring the shoe block assembly 10 into contact with the wheel hub, thus moving the rocker arm 30 to a preset position. For example... Figure 3As shown, when the rocker arm 30 moves to the preset position, it triggers the pawl 42 to move. The pawl 42 drives the ratchet 41 to rotate, and the ratchet 41 then drives the cam 20 to rotate, thereby adjusting the initial position of the cam 20 in the braking direction. Simultaneously, the rotation of the cam 20 drives the shoe assembly 10 to move in the braking direction. The change in the initial position of the cam 20 leads to a change in the initial position of the shoe assembly 10 in the braking direction. That is, adjusting the initial position of the cam 20 changes the initial position of the shoe assembly 10 in the braking direction, bringing the shoe assembly 10 closer to the wheel hub. During the next braking, the cam 20, driven by the rocker arm 30, moves from the adjusted initial position, and the shoe assembly 10 also moves from the adjusted initial position. The rocker arm 30 drives the shoe assembly 10 to move a small distance to make it contact the wheel hub, achieving braking. This ensures good braking performance even after the shoe assembly 10 has worn down.
[0032] In one embodiment, the pawl member 42 includes a first pawl 421 and a second pawl 422. The first pawl 421 drives the ratchet member 41 to rotate when the rocker arm 30 moves to a preset position. The second pawl 422 disengages from the ratchet member 41 when it rotates and re-engages with it after the ratchet member 41 has rotated a preset angle. This allows the ratchet member 41 to stop rotating after rotating a preset angle, thus achieving adjustment of the cam member 20. By using the first pawl 421 and the second pawl 422 to drive the ratchet member 41 to rotate a preset angle, the rotation angle of the ratchet member 41 can be better controlled, improving the adjustment accuracy.
[0033] In one embodiment, the ratchet member 41 is provided with multiple ratchet teeth. A first pawl 421 and a second pawl 422 are both engaged with the ratchet teeth. When the rocker arm 30 moves to a preset position, the first pawl 421 pushes the ratchet member 41 to rotate, and the rotation of the ratchet member 41 pushes away the second pawl 422. After the ratchet member 41 rotates by a preset angle (e.g., the angle corresponding to one or more ratchet teeth), the second pawl 422 re-engages with another ratchet tooth of the ratchet member 41, stopping the ratchet member 41 from rotating, thereby achieving adjustment of the ratchet member 41. The first pawl 421 can rotate under the drive of a motor, or it can rotate under the reverse force of the limiting member 51 when the rocker arm 30 moves to the preset position and contacts the limiting member 51.
[0034] In one embodiment, such as Figure 3 As shown, the first pawl 421 includes a pawl portion 4211 and a drive portion 4212 connected to the pawl portion 4211. The drive portion 4212 is used to abut against the limiting member 51 when the rocker arm 30 moves to the preset position, so as to drive the pawl portion 4211 to move. This allows for a better design of the position of the first pawl 421, so as to more stably drive the ratchet member 41 to rotate.
[0035] In one embodiment, such as Figure 5 As shown, the first pawl 421 also includes a connecting part 4213, which is connected between the driving part 4212 and the pawl part 4211. This allows for a more reasonable design of the positions of the driving part 4212 and the pawl part 4211, reducing the space occupied by the first pawl 421.
[0036] In one embodiment, one end of the connecting part 4213 is rotatably connected to the pawl part 4211, and the other end of the connecting part 4213 is rotatably connected to the rocker arm 30, thereby effectively transmitting torque from one end of the connecting part 4213 to the other end and improving the stability of the first pawl 421 during the movement of the pawl part 4211.
[0037] Specifically, such as Figure 3 As shown, an elastic element (such as a spiral spring) connects the connecting part 4213 to the rocker arm 30. Under the action of the brake cable, the rocker arm 30 rotates counterclockwise. The first pawl 421, the second pawl 422, and the ratchet 41 rotate synchronously with the rocker arm 30 until the driving part 4212 contacts the limiting member 51. Afterward, the rocker arm 30 continues to rotate counterclockwise under the action of the brake cable. The driving part 4212 and the connecting part 4213 rotate counterclockwise under the action of the limiting member 51, while the elastic element is compressed. The counterclockwise rotation of the connecting part 4213 drives the pawl part 4211 to rotate counterclockwise, thereby engaging with the adjacent ratchet teeth of the ratchet 41. When the brake cable is released, the rocker arm 30 rotates clockwise, and the connecting part 4213 rotates clockwise under the action of the elastic element, thereby driving the pawl part 4211 to rotate clockwise, which in turn drives the ratchet 41 to rotate counterclockwise. The ratchet 41 rotates counterclockwise to push the second pawl 422 away. After the ratchet 41 rotates, the second pawl 422 re-engages with the adjacent ratchet teeth of the ratchet 41. Therefore, after the ratchet 41 rotates a preset angle, it continues to rotate synchronously with the rocker arm 30 under the action of the first pawl 421 and the second pawl 422. The rotation of the ratchet 41 by the preset angle causes the cam 20 to rotate by the preset angle, thereby achieving the adjustment of the initial position of the cam 20.
[0038] In another embodiment, the first pawl 421 can also be an escapement fork, which includes two pawls. When the rocker arm 30 moves to a preset position, the escapement fork releases the ratchet 41. The ratchet 41 rotates under the action of the elastic member and pushes away the second pawl 422. After the ratchet 41 rotates at a preset angle, the escapement fork and the second pawl 422 re-engage on the ratchet 41.
[0039] In one embodiment, the braking device further includes a housing 50, a cam member 20 passing through the housing 50, a shoe assembly 10 located inside the housing 50, and a rocker arm 30 and an adjustment assembly 40 located outside the housing 50. Placing the rocker arm 30 and the adjustment assembly 40 outside the housing 50 simplifies the structure of the adjustment assembly 40 and reduces manufacturing difficulty.
[0040] In one embodiment, the limiting member 51 protrudes from the housing 50. When the rocker arm 30 moves to the preset position, the first pawl 421 abuts against the limiting member 51, thereby reducing the number of parts and reducing assembly complexity.
[0041] In another embodiment, the limiting member 51 may also be provided on the bicycle where the braking device is located.
[0042] In one embodiment, the braking device further includes a first elastic element disposed between the housing 50 and the rocker arm 30, providing a restoring torque to the rocker arm 30. For example, when the brake cable is tightened, the rocker arm 30 compresses the first elastic element, and when the brake cable is released, the elastic element provides a restoring torque to the rocker arm 30, thereby improving the stability of the rocker arm 30 during movement.
[0043] In one embodiment, the braking device further includes a second elastic element disposed between the rocker arm 30 and the second pawl 422, providing a restoring torque to the second pawl 422. For example, when the ratchet 41 pushes the second pawl 422 away, it compresses the second elastic element. Subsequently, the second pawl 422 engages again with the ratchet 41 under the action of the second elastic element, thereby improving the adjustment sensitivity of the adjustment assembly 40.
[0044] In one embodiment, a square hole 411 is provided on the ratchet member 41, and the ratchet member 41 is mounted on the cam member 20 through the square hole 411. Specifically, the ratchet member 41 is fixedly mounted on the cam member 20 through the square hole 411, and the rocker arm 30 is rotatably mounted on the cam member 20. The first pawl 421 and the second pawl 422 are engaged on the cam member 20, so that when the rocker arm 30 moves, it drives the ratchet member 41 to rotate, thereby driving the cam member 20 to rotate, thus achieving braking of the wheel hub.
[0045] In one embodiment, the shoe assembly 10 includes two brake shoes 11, one end of which is hinged and the other end of which abuts against the cam member 20. When the cam member 20 rotates, it simultaneously drives the two brake shoes 11 to move toward the wheel hub, thereby improving the braking performance of the braking device.
[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A braking device, characterized in that, The system includes a shoe block assembly (10), a cam (20), a rocker arm (30), and an adjustment assembly (40). One end of the cam (20) abuts against the shoe block assembly (10), and the other end of the cam (20) is connected to the rocker arm (30). The adjustment assembly (40) is mounted on the rocker arm (30) and includes a ratchet (41) and a pawl (42) engaged with the ratchet (41). The ratchet (41) is mounted on the cam (20) and is used to rotate synchronously with the rocker arm (30) under the action of the pawl (42) to drive the cam (20) to move in the braking direction. The pawl (42) is used to drive the ratchet (41) to rotate a preset angle when the rocker arm (30) moves to a preset position to adjust the initial position of the cam (20) moving in the braking direction.
2. The braking device according to claim 1, characterized in that, The pawl (42) includes a first pawl (421) and a second pawl (422). The first pawl (421) is used to drive the ratchet (41) to rotate when the rocker arm (30) moves to a preset position. The second pawl (422) is used to disengage from the ratchet (41) when the ratchet (41) rotates, and re-engage with the ratchet (41) after the ratchet (41) rotates a preset angle.
3. The braking device according to claim 2, characterized in that, The first pawl (421) includes a pawl portion (4211) and a drive portion (4212) connected to the pawl portion (4211). The drive portion (4212) is used to abut against the limiting member (51) when the rocker arm (30) moves to a preset position, so as to drive the pawl portion (4211) to move.
4. The braking device according to claim 3, characterized in that, The first pawl (421) further includes a connecting portion (4213), which is connected between the driving portion (4212) and the pawl portion (4211).
5. The braking device according to claim 4, characterized in that, One end of the connecting part (4213) is rotatably connected to the pawl part (4211), and the other end of the connecting part (4213) is rotatably connected to the rocker arm (30).
6. The braking device according to claim 3, characterized in that, The braking device further includes a housing (50), the cam (20) is mounted on the housing (50), the shoe assembly (10) is located inside the housing (50), and the rocker arm (30) and the adjusting assembly (40) are located outside the housing (50).
7. The braking device according to claim 6, characterized in that, The limiting member (51) protrudes from the housing (50).
8. The braking device according to claim 6, characterized in that, The braking device further includes a first elastic element disposed between the housing (50) and the rocker arm (30) to provide a restoring torque to the rocker arm (30).
9. The braking device according to claim 2, characterized in that, The braking device further includes a second elastic element disposed between the rocker arm (30) and the second pawl (422) to provide a restoring torque to the second pawl (422).
10. The braking device according to claim 1, characterized in that, The ratchet component (41) has a square hole (411) and the ratchet component (41) is mounted on the cam component (20) through the square hole (411).