Bicycle caliper brake

Abstract

This utility model relates to the field of bicycle brake technology and discloses a bicycle caliper brake, including a left arm, a right arm, a central shaft, a return spring, a brake pad assembly, a side shaft, and a connecting arm. The left arm and one end of the connecting arm are pivotally connected via the central shaft. The other end of the right arm and the connecting arm are rotatably connected to one side of the central shaft via the side shaft, with one end of the left arm positioned between the right arm and the connecting arm. The brake pad assembly is symmetrically arranged at the lower ends of the left and right arms. The other end of the right arm has a brake cable fastening structure that corresponds to the brake cable threading structure on the left arm. The return spring is located at the front end of the central shaft, with both ends abutting and limiting the movement of the left arm and the connecting arm, respectively. This design solves the problem that existing caliper brakes, where both brake arms use a single central rod as the rotation center, require riders to exert significant braking force to achieve the desired braking effect.

Description

Technical Field

[0001] This utility model relates to the field of bicycle brake technology, specifically to a bicycle caliper brake. Background Technology

[0002] Clamp brakes are commonly used on bicycles and cyclists as braking components and are an important safety component of vehicles. Existing caliper brakes widely used in the market, such as an improved caliper brake disclosed in CN219687544U and a bicycle braking device disclosed in CN2049209U, mainly consist of a left brake fork assembly, a right brake fork assembly, a central shaft, and a spring. The left brake fork assembly and the right brake fork assembly are connected by a central shaft, and the two ends of the spring are connected to the left brake arm and the right brake arm respectively to drive and reset.

[0003] The two brake arms of the aforementioned clamp brake both use a single center rod as the center of rotation. At the same time, due to the limited installation space, the dimensions of the left brake fork and the right brake arm cannot be increased indefinitely to reduce the braking force. Therefore, it is difficult to achieve the ideal value for the ratio of the power arm to the resistance arm of the clamp brake, and riders often need a large braking force to achieve the desired braking effect. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a bicycle clamp brake that overcomes the problem that in existing clamp brakes, both brake arms use a single center rod as the rotation center, requiring riders to apply significant braking force to achieve the desired braking effect.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] This utility model relates to a bicycle caliper brake, comprising a left arm, a right arm, a central shaft, a return spring, a brake pad assembly, a side shaft, and a connecting arm. The left arm and one end of the connecting arm are pivotally connected via the central shaft. The other end of the right arm and the connecting arm are rotatably connected to one side of the central shaft via the side shaft, with one end of the left arm positioned between the right arm and the connecting arm. The brake pad assembly is symmetrically arranged at the lower ends of the left and right arms. The other end of the right arm has a brake cable fastening structure that corresponds to the brake cable threading structure on the left arm. The return spring is located at the front end of the central shaft, with both ends abutting and limiting the movement of the left arm and the connecting arm, respectively.

[0007] Further: The left arm includes: a first pivot part adapted to the central axis, a first braking part adapted to the brake pad assembly and disposed on one side of the first pivot part, a limiting part disposed on the other side of the first pivot part, and a first driving part adapted to the brake cable threading structure and disposed on one side of the pivot connection part. A limiting cavity groove adapted to the return spring is provided on the upper rear side of the braking part.

[0008] Furthermore: The right arm is provided with a second pivot part adapted to and connected to the side shaft. One end of the second pivot part is provided with a second braking part adapted to the brake pad assembly, and the other end is provided with a second driving part adapted to the brake cable fastening structure.

[0009] Furthermore, the brake cable fastening structure is designed as an eccentric adjustable structure.

[0010] Furthermore, the bottom end of the brake assembly is also provided with a downwardly extending drainage section.

[0011] Furthermore: the connecting arm is designed as an arc-shaped planar structure, with a central shaft hole at one end and a side shaft hole at the other end. The rear side of the connecting arm near the central shaft hole is also provided with a limiting groove adapted to a return spring. The central shaft passes through the pivot connection part and the central shaft hole in sequence and is connected to the rear side of the limiting groove by a nut.

[0012] Furthermore, a T-shaped spacer is provided between the central shaft and the pivot connection, and the T-shaped spacer is a one-piece molded plastic structure.

[0013] Furthermore: the other end of the left arm abuts against the rear side of the right arm for a limiting position, and a limiting protrusion adapted to and abuts against the limiting part is also provided on the rear side of the right arm above the second pivot part.

[0014] Furthermore, a rolling mechanism is provided at the contact point between the left and right arms. The rolling mechanism includes an adjustable rolling element disposed at the limiting part and a sliding reinforcement structure disposed on the limiting boss that is adapted to and corresponds to the adjustable rolling element.

[0015] Further: The adjustable rolling element is an adjusting bolt adapted to and connected to the threaded adjusting hole provided on the limiting part. One end of the adjusting bolt is provided with an internal hexagon countersunk groove, and the other end is provided with a hemispherical structure. The sliding reinforcement structure is a flat-head rivet adapted to and connected to the mounting through hole provided on the limiting boss. The flat head of the flat-head rivet abuts and slides against the hemispherical structure.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This application features a left arm pivotally connected to the central axis, with one end of the linkage arm connected to the central axis and the other end of the linkage arm connected to the right arm via a side axis. A brake cable fastening structure is located at one end of the right arm, corresponding to a brake cable threading structure on the left arm. One end of the brake cable passes through the brake cable threading structure and is fixedly connected via the brake cable fastening structure. The rear side of the central axis is fixed to the bicycle's front or rear fork with fasteners. When braking, pulling the brake cable causes the right arm to rotate around the side axis to brake, simultaneously driving the left arm to rotate around the central axis to brake. The linkage arm design extends the length of the braking power arm, thereby adjusting and improving the ratio of the power arm to the resistance arm. This overcomes the problem of high braking force required when using a single central rod as the rotation center, allowing the rider to achieve ideal braking with minimal braking force. A return spring is located at the front end of the central axis, with both ends abutting and limiting the movement of the left arm and linkage arm respectively. When the brake cable is released, the right arm returns to its original position synchronously under the action of the linkage arm.

[0018] By abutting and limiting the limiting part at the other end of the left arm and the limiting protrusion on the rear side of the right arm, a rotation fulcrum is provided for the opening and closing movement of the left and right arms, ensuring that the left and right arms can move in sync and improving the braking stability of the two arms. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the front and side three-dimensional structure of this utility model;

[0020] Figure 2 This is a three-dimensional structural diagram of the rear side of this utility model;

[0021] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 4 This is a perspective view of the rear side of the connecting arm of this utility model;

[0023] Figure 5 This is a schematic diagram of the rear side of the right arm of this utility model;

[0024] Figure 6 This is a schematic diagram of the rear side of the left arm of this utility model.

[0025] Attached image labels:

[0026] Left arm 1; First pivot part 11; First braking part 12; Limiting part 13; Threaded adjustment hole 131; First driving part 14; Limiting cavity groove 15; Right arm 2; Second pivot part 21; Second braking part 22; Limiting boss 23; Mounting through hole 231; Second driving part 24; Central shaft 3; T-shaped spacer 31; Return spring 4; Brake skin assembly 5; Side shaft 6; Connecting rod arm 7; Central shaft hole 71; Side shaft hole 72; Limiting groove 73; Brake cable fastening structure 8; Rolling mechanism 9; Adjustable rolling element 91; Sliding reinforcement structure 92. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1-3 The diagram shows a bicycle caliper brake, including a left arm 1, a right arm 2, a central shaft 3, a return spring 4, a brake pad assembly 5, a side shaft 6, and a connecting arm 7. The left arm 1 and one end of the connecting arm 7 are pivotally connected via the central shaft 3. The right arm 2 and the other end of the connecting arm 7 are rotatably connected to one side of the central shaft 3 via the side shaft 6, with one end of the left arm 1 positioned between the right arm 2 and the connecting arm 7. The brake pad assembly 5 is symmetrically arranged at the lower ends of the left arm 1 and the right arm 2. The other end of the right arm 2 has a brake cable fastening structure 8 that corresponds to the brake cable threading structure on the left arm 1. The return spring 4 is located at the front end of the central shaft 3, with both ends abutting and limiting the movement of the left arm 1 and the connecting arm 7, respectively. The left arm 1 is pivotally connected to one end of the connecting arm 7, and the other end of the connecting arm 7 is connected to the right arm 2 via the side shaft 6. The brake cable fastening structure 8 at one end of the right arm 2 corresponds to the brake cable threading structure on the left arm 1. The brake cable threading structure is appropriately matched, with one end of the brake cable passing through the brake cable threading structure and being fixedly connected through the brake cable fastening structure 8. The rear side of the central shaft 3 is fixed to the bicycle front or rear fork by fasteners. When braking, pulling the brake cable causes the right arm 2 to rotate inward around the side shaft 6, and the brake pad assembly brakes the inner circle of the wheel. At the same time, it drives the left arm 1 to rotate around the central shaft to brake. The pivotal connection of the central shaft 3 and the side shaft 6, along with the setting of the linkage arm 7, extends the length of the braking force arm, thereby adjusting and optimizing the ratio of the force arm to the resistance arm. Compared with the existing single central rod as the rotation center, the braking force required is smaller, meeting the rider's requirement to achieve the ideal braking effect with very little braking force. By setting a return spring 4 at the front end of the central shaft 3, with both ends abutting and limiting the left arm 1 and the linkage arm 7 respectively, when the brake cable is released, the right arm 2 returns to its original position synchronously under the drive of the linkage arm 7.

[0031] Specifically: such as Figure 3 , 6As shown, the left arm 1 includes: a first pivot part 11 adapted to the central shaft 3; a first braking part 12 adapted to the brake assembly 5 on one side of the first pivot part 11; a limiting part 13 on the other side of the first pivot part 11; and a first driving part 14 adapted to the brake cable threading structure on one side of the pivot connection part 11. A limiting cavity 15 adapted to the return spring 4 is provided above the rear side of the braking part 12. One end of the return spring 4 can directly abut against one side of the limiting cavity 15 for limiting, effectively preventing the return spring 4 from slipping and affecting the reset. A limiting post can also be provided in the limiting cavity 15 to abut against one end of the return spring 4 and slide. The limiting post is a steel structure and can also be provided with an annular limiting groove. The pivot connection part 11 has a countersunk step hole adapted to the head of the central shaft 3 to ensure that it does not interfere with the rotation of the right arm 2 on the front side. Figure 3 , 5 As shown, the right arm 2 is provided with a second pivot part 21 that is adapted to and connected to the side shaft 6. The second pivot part 21 is provided with a connecting through hole. The side shaft 6 is a bolt with a smooth upper end and a threaded lower end. The side shaft 6 is passed through the second pivot part 21 and one end of the connecting rod arm 7 in sequence and locked with a nut. One end of the second pivot part 21 is provided with a second braking part 22 adapted to the brake pad assembly 5, and the other end is provided with a second driving part 24 adapted to the brake cable fastening structure 8. The brake cable fastening structure 8 can use the combination structure of a cable tightening screw and a locking nut commonly used in brakes to fasten the brake cable end. Figure 3-4 As shown, the connecting arm 7 is designed as an arc-shaped planar structure. One end is provided with a central shaft hole 71 adapted to the central shaft 3, and the other end is provided with a side shaft hole 72. The rear side of the connecting arm 7 near the central shaft hole 71 is also provided with a limiting groove 73 adapted to the return spring 4. The central shaft 3 passes through the pivot connection part 11 and the central shaft hole 71 in sequence and is fastened by a washer and nut and abuts against the rear side of the limiting groove 73.

[0032] An optional implementation: the brake cable fastening structure 8 is an eccentrically adjustable structure, which allows the brake cable to be loosened by simply rotating the eccentrically adjustable brake cable fastening structure 8 without removing the brake and brake cable, thus facilitating the disassembly and assembly of the wheel; specifically: the brake cable fastening structure 8 consists of an eccentric adjustment component pivotally connected to a through hole at one end of the right arm 2 and a cable fastening component connected to one side of the eccentric adjustment component.

[0033] An alternative implementation: The bottom end of the brake pad assembly 5 is also provided with a downwardly extending drainage section; this facilitates the drainage of mud and water as quickly as possible during rainy weather, reducing the impact of mud and water on the braking effect of the brake pads.

[0034] An optional implementation: To improve the rotational flexibility of the left arm, a T-shaped spacer 31 is provided between the central shaft 3 and the pivot connection 11. The T-shaped spacer 31 is a one-piece molded plastic structure. The flange surface of the T-shaped spacer 31 is located between the left arm 1 and the connecting rod arm 7, thereby reducing the friction and wear between the central shaft 3, the pivot connection 11 and the connecting rod arm 7.

[0035] An alternative implementation: such as Figure 1 , 3 As shown in Figures 5 and 6, the limiting part 13 at the other end of the left arm 1 abuts against the rear side of the right arm 2 for limiting. The rear side of the right arm 2 and above the second pivot part 21 are also provided with a limiting boss 23 that is adapted to abut against the limiting part 13. The limiting part 13 and the limiting boss 23 are abutted against for limiting, providing a rotation fulcrum for the relative movement of the left and right arms, ensuring braking balance and stability, and the left and right arms can move in conjunction at the same time.

[0036] An alternative implementation: such as Figure 1 , 3 As shown, to improve the smoothness and strength of the contact point between the left arm 1 and the right arm 2, a rolling mechanism 9 is also provided at the contact point between the left arm 1 and the right arm 2. The rolling mechanism 9 includes an adjustable rolling element 91 disposed on the limiting part 13 and a sliding reinforcement structure 92 disposed on the limiting boss 23 and adapted to the adjustable rolling element 91. The adjustable rolling element 91 is an adjusting bolt adapted to and connected to the threaded adjusting hole 131 provided on the limiting part 13. The setting of the adjusting bolt can adjust the limiting part 13 relative to the limiting boss. At the position of platform 23, the upper end of the adjusting bolt is provided with an internal hexagon countersunk groove, and the lower end is provided with a hemispherical structure; the sliding reinforcement structure 92 is a flat-head rivet that is adapted to and connected to the mounting through hole 231 provided on the limiting boss 23, and the flat head of the flat-head rivet slides against the hemispherical structure; the flat-head rivet is preferably a large flat-head rivet made of stainless steel, and the left arm 1, right arm 2 and connecting rod arm 7 are preferably aluminum alloy die-cast structures, wherein the flat-head rivet can also be made of stainless steel inserts that are directly embedded during die casting.

[0037] 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 bicycle clamp brake, characterized in that: It includes a left arm (1), a right arm (2), a central shaft (3), a return spring (4), a brake pad assembly (5), a side shaft (6), and a connecting arm (7). The left arm (1) and one end of the connecting arm (7) are pivotally connected through the central shaft (3). The other end of the right arm (2) and the connecting arm (7) are rotatably connected to one side of the central shaft (3) through the side shaft (6), and one end of the left arm (1) is placed between the right arm (2) and the connecting arm (7). The brake pad assembly (5) is symmetrically arranged at the lower ends of the left arm (1) and the right arm (2). The other end of the right arm (2) is provided with a brake cable fastening structure (8) that is compatible with the brake cable threading structure provided on the left arm (1). The return spring (4) is located at the front end of the central shaft (3) and its two ends are respectively in contact with and limited by the left arm (1) and the connecting arm (7).

2. The bicycle clamp brake according to claim 1, characterized in that: The left arm (1) includes: a first pivot part (11) adapted to the central shaft (3), a first braking part (12) adapted to the brake assembly (5) on one side of the first pivot part (11), a limiting part (13) on the other side of the first pivot part (11), and a first driving part (14) adapted to the brake cable threading structure on one side of the pivot connection part (11). A limiting cavity (15) adapted to the return spring (4) is provided above the rear side of the braking part (12).

3. The bicycle clamp brake according to claim 1, characterized in that: The right arm (2) is provided with a second pivot part (21) adapted to and connected to the side shaft (6). One end of the second pivot part (21) is provided with a second braking part (22) adapted to the brake pad assembly (5), and the other end is provided with a second driving part (24) adapted to the brake cable fastening structure (8).

4. The bicycle clamp brake according to claim 3, characterized in that: The brake cable fastening structure (8) is configured as an eccentric adjustable structure.

5. The bicycle clamp brake according to claim 3, characterized in that: The bottom end of the brake assembly (5) is also provided with a downwardly extending drainage section.

6. The bicycle clamp brake according to claim 1, characterized in that: The connecting arm (7) is designed as an arc-shaped planar structure. One end is provided with a central shaft hole (71) adapted to the central shaft (3), and the other end is provided with a side shaft hole (72). The connecting arm (7) is also provided with a limiting groove (73) adapted to the return spring (4) at the rear side near the central shaft hole (71). The central shaft (3) passes through the pivot connection part (11) and the central shaft hole (71) in sequence and is connected to the rear side of the limiting groove (73) by a nut.

7. The bicycle clamp brake according to claim 6, characterized in that: A T-shaped spacer (31) is also provided between the central shaft (3) and the pivot connection (11), and the T-shaped spacer (31) is a one-piece plastic molded structure.

8. The bicycle clamp brake according to any one of claims 1-7, characterized in that: The other end of the left arm (1) abuts against the rear side of the right arm (2) and is limited. The rear side of the right arm (2) and above the second pivot (21) are provided with a limiting boss (23) that is adapted to abut against the limiting part (13).

9. The bicycle clamp brake according to claim 8, characterized in that: The left arm (1) and the right arm (2) are further provided with a rolling mechanism (9). The rolling mechanism (9) includes an adjustable rolling body (91) provided on the limiting part (13) and a sliding reinforcement structure (92) provided on the limiting boss (23) and adapted to the adjustable rolling body (91).

10. The bicycle clamp brake according to claim 9, characterized in that: The adjustable rolling element (91) is an adjusting bolt that is adapted to and connected to the threaded adjusting hole (131) provided on the limiting part (13). One end of the adjusting bolt is provided with an internal hexagon countersunk groove, and the other end is provided with a hemispherical structure. The sliding reinforcing structure (92) is a flat-head rivet that is adapted to and connected to the mounting through hole (231) provided on the limiting boss (23). The flat head of the flat-head rivet slides against the hemispherical structure.

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