Variable-radius pull rod structure and wire pull disc brake

Abstract

The utility model relates to a variable-radius pull rod structure and a linear pull disc brake. The variable-radius pull rod structure is matched with a brake caliper body, the brake caliper body is composed of a first caliper body and a second caliper body, a brake cavity with an opening in one side is formed in the middle of the brake caliper body, a brake part is arranged in the brake cavity, and a driving part used for pushing the brake part to move so as to clamp a brake disc is arranged in the first caliper body. The first end of the first clamp body is rotationally assembled with the upper end of the first clamp body and is connected with the driving end of the driving part; the adjusting piece comprises a base, a first connecting piece and a second connecting piece, the base is fixed to the brake caliper body, and an outer inserting hole and an inner inserting hole are formed in the base; the first end of the threading pin column is inserted and assembled in the outer insertion hole or the inner insertion hole, a threading hole is formed in the second end of the threading pin column, a pull wire penetrates through the threading hole, and the first end of the pull wire is connected to the second end of the pull rod. The disc brake assembly can adapt to bicycle brake handles with different braking force requirements and assembly requirements, and the disc brake assembly adaptability is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle accessories, in particular to a variable radius pull rod structure and a wire-pull disc brake. Background Art

[0002] There are currently two control transmission methods for disc brakes, namely cable disc brakes and hydraulic disc brakes. Hydraulic disc brakes are more expensive, so they are mostly installed on high-end bicycles or professional racing bikes. Compared with hydraulic disc brakes, cable disc brakes have a simpler structure and lower cost. Limited by the production cost of bicycles, cable disc brakes are still widely installed and used on bicycles.

[0003] The positions of the pull rod and the pull cable of the cable-pull disc brakes currently on the market are fixed, that is, the torque radius generated by the pull cable during braking is fixed, but the brake handles have different lever ratios and cable travels. The same brake caliper body has two different disadvantages when matched with different brake handles. One is that the spacing between the brake pad and the disc is sufficient, which is convenient for installation, but the braking torque is small and the braking force is poor; the other is that the braking force is strong, but the spacing between the brake pad and the disc is too small, which makes assembly difficult and there is a risk of rubbing the disc. For this reason, we proposed a variable radius pull rod structure and a cable-pull disc brake. Utility Model Content

[0004] The embodiments of the present application provide a variable radius pull rod structure and a cable-pull disc brake to at least solve the problems in the prior art where the same brake caliper body is matched with different brake handles. Firstly, the spacing between the brake pad and the disc is sufficient, which makes installation convenient, but the braking torque is small and the braking force is poor; secondly, the braking force is strong, but the spacing between the brake pad and the disc is too small, which makes assembly difficult and there is a risk of scratching the disc.

[0005] In a first aspect, an embodiment of the present application provides a variable radius pull rod structure, which is arranged in conjunction with a brake caliper body, wherein the brake caliper body is composed of a first caliper body and a second caliper body and a brake cavity with one side open is opened in the middle thereof, a brake member is arranged in the brake cavity, and a driving member for pushing the brake member to move so as to clamp the brake disc is arranged in the first caliper body, including:

[0006] A pull rod, a first end of which is rotatably assembled with the upper end of the first caliper body and connected with the driving end of the driving member;

[0007] The adjusting member comprises: a base, which is fixed to the brake caliper body and is provided with an outer plug hole and an inner plug hole; a threading pin, a first end of which is inserted and assembled in the outer plug hole or the inner plug hole, and a second end of which is provided with a threading hole, a pull wire is passed through the threading hole, and the first end of the pull wire is connected to the second end of the pull rod.

[0008] In some embodiments, a wire pressing plate is provided at the second end of the pull rod, and the wire pressing plate is assembled to the second end of the pull rod via a wire pressing screw to fix the first end of the pull wire.

[0009] In some embodiments, a trumpet-shaped wire drawing groove is integrally formed on one side of the second end of the pull rod corresponding to the threading pin to adapt to the movement trajectory of the pull wire at different working radii.

[0010] In some embodiments, the first end of the threading pin is clamped and limited with an elastic opening retaining ring to assemble the threading pin in the outer plug hole or the inner plug hole.

[0011] In some embodiments, the brake member comprises:

[0012] The brake pad spring has a U-shaped structure;

[0013] Brake pads, two in number, symmetrically arranged on the two side arms of the brake pad spring to elastically return to their original position after braking;

[0014] A guide pin is inserted into the brake pad spring and fixed on the brake caliper body to fix the brake pad spring in the brake cavity and prevent it from interfering with the movement of the pull rod.

[0015] In some embodiments, the driving member includes:

[0016] A first push rod, which is axially rotated in the movable cavity in the middle of the first caliper body, and the upper end of which is fixedly assembled with the first end of the pull rod by a pull rod screw;

[0017] An elastic member, which is sleeved on the first push rod, and whose two ends abut against the first clamp body and the pull rod respectively;

[0018] A pressing portion, which is integrally formed at the lower end of the first push rod and has a plurality of first water drop ball paths at the upper end;

[0019] A second push rod is disposed on the upper part of the pressing portion and fixedly assembled with the movable chamber, and its bottom end abuts against the brake member, and the lower end of the second push rod has a plurality of second water drop ball paths that match and correspond to the first water drop ball paths;

[0020] There are several transmission balls, and their rolling limit is within the complete water drop ball track formed by the combination of the first water drop ball track and the second water drop ball track.

[0021] In some embodiments, the first caliper body is integrally formed with assembly wings for assembling the brake caliper body on a bicycle frame.

[0022] In a second aspect, an embodiment of the present application provides a wire-pull disc brake, comprising the variable radius pull rod structure described in the first aspect, and:

[0023] There are two brake handles, which are symmetrically mounted on both sides of the bicycle handlebar and connected to the second end of the pull line. When the brake handle is held, the brake member is driven to clamp and brake the brake disc.

[0024] Compared with the related art, the variable radius pull rod structure and the cable-pull disc brake provided by the embodiments of the present application have at least the following technical effects:

[0025] By adjusting the assembly of the threading pin in the outer hole and the inner hole, and thereby changing the distance from the pull cable to the rotation axis of the pull rod, the bicycle brake handle is adjusted to suit different braking force requirements and assembly requirements. In this way, the adaptability of the disc brake assembly is optimized.

[0026] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The three-dimensional structure of the variable radius tie rod structure is shown according to an exemplary embodiment. Figure 1 .

[0029] Figure 2 The three-dimensional structure of the variable radius tie rod structure is shown according to an exemplary embodiment. Figure 2 .

[0030] Figure 3 The figure is a cross-sectional structural diagram of a wire-pull disc brake according to an exemplary embodiment.

[0031] Figure 4 It is a schematic diagram of a first movement radius of a variable radius pull rod structure according to an exemplary embodiment.

[0032] Figure 5 It is a schematic diagram of a second movement radius of a variable radius pull rod structure according to an exemplary embodiment.

[0033] Description of reference numerals: brake caliper body 10: first caliper body 101, second caliper body 102, assembly wing 103;

[0034] Pull rod 20, wire pressing plate 201, wire pressing screw 202, wire pulling groove 203;

[0035] Adjusting member 30: base 301, external plug hole 302, internal plug hole 303, threading pin 304, threading hole 305, elastic opening retaining ring 306;

[0036] Driving member 40: pull rod screw 401, first push rod 402, push portion 403, elastic member 404, second push rod 405, transmission ball 406;

[0037] Braking component 50: brake pad spring 501, brake pad 502, guide pin 503; pull wire 60. DETAILED DESCRIPTION

[0038] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the related art, the position of the pull rod and the pull cable of the cable-operated disc brake is fixed, that is, the torque radius generated by the pull cable during braking is fixed, but the brake handle has different lever ratios and cable travels. The same brake caliper body will produce two different disadvantages when matching different brake handles. One is that the distance between the brake pad and the disc is sufficient, which is convenient for installation, but the braking torque is small and the braking force is poor; the other is that the braking force is strong, but the distance between the brake pad and the disc is too small, which makes assembly difficult and there is a risk of rubbing the disc.

[0042] Based on the above situation, an embodiment of the utility model provides a variable radius pull rod structure and a wire-pull disc brake, which are described in detail below in conjunction with specific embodiments and drawings.

[0043] Example 1

[0044] An embodiment of the utility model provides a variable radius pull rod structure. Figure 1 The three-dimensional structure of the variable radius tie rod structure is shown according to an exemplary embodiment. Figure 1 . Figure 2 The three-dimensional structure of the variable radius tie rod structure is shown according to an exemplary embodiment. Figure 2 .like Figure 1-2 As shown, the variable radius pull rod structure is arranged in conjunction with a brake caliper body 10, the brake caliper body 10 is composed of a first caliper body 101 and a second caliper body 102, and a brake cavity with one side open is opened in the middle thereof, a brake member 50 is arranged in the brake cavity, and a driving member 40 for pushing the brake member 50 to move so as to clamp the brake disc is arranged in the first caliper body 101, including:

[0045] A pull rod 20, a first end of which is rotatably assembled with the upper end of the first clamp body 101 and connected to the driving end of the driving member 40;

[0046] The adjusting member 30 comprises: a base 301, which is fixed to the brake caliper body 10 and is provided with an outer plug hole 302 and an inner plug hole 303; a threading pin 304, a first end of which is inserted and assembled in the outer plug hole 302 or the inner plug hole 303, and a threading hole 305 is provided at the second end, a pull wire 60 is passed through the threading hole 305, and the first end of the pull wire 60 is connected to the second end of the pull rod 20; the first end of the threading pin 304 is clamped and limited with an elastic open retaining ring 306 to assemble the threading pin 304 in the outer plug hole 302 or the inner plug hole 303.

[0047] Optionally, a wire pressing plate 201 is provided at the second end of the pull rod 20, and the wire pressing plate 201 is assembled to the second end of the pull rod 20 through a wire pressing screw 202 to fix the first end of the pull wire 60; a trumpet-shaped wire pulling groove 203 is integrally formed on one side of the second end of the pull rod 20 corresponding to the threading pin 304 to adapt to the movement trajectory of the pull wire 60 under different working radii.

[0048] In the technical solution of the above embodiment, Figure 4 It is a schematic diagram of a first movement radius of a variable radius pull rod structure according to an exemplary embodiment. Figure 5 FIG. 1 is a schematic diagram of a second movement radius of a variable radius pull rod structure according to an exemplary embodiment. Figure 1-2 4-5, by adjusting the assembly of the threading pin 304 in the outer plug hole 302 and the inner plug hole 303, the distance between the pull wire 60 and the rotation axis of the pull rod 20 can be changed to adjust the bicycle to be adapted to different braking force requirements and assembly requirements; specifically:

[0049] See attached Figure 4 The threading pin 304 is assembled in the outer plug hole 302. The pull rod 20 has a first end as a rotation axis and a second end as a traction end. The first movement radius of its rotation is R1. The rotation angle of the pull rod 20 required for braking is b, and the wire pulling stroke is L1. Figure 5 , the threading pin 304 is assembled in the inner plug hole 303, the pull rod 20 takes the first end as the rotation axis, the second end as the traction end, the second movement radius of its rotation is R2, the rotation angle of the pull rod 20 required for braking is b, and the wire pulling stroke is L2;

[0050] Combined with Figure 4 and 5 , the first movement radius R1>the second movement radius R2; the wire pulling stroke L1>the wire pulling stroke L2, therefore under the same pulling force conditions, when the threading pin 304 is assembled in the external plug hole 302, the pulling force torque of the wire 60 is large, and the braking force is strong, but in this process, the wire 60 is slowly tensioned, and the brake component 50 is pushed slowly, which is suitable for brake handles with a small lever ratio and a large wire pulling stroke; when the threading pin 304 is assembled in the internal plug hole 303, the pulling force torque of the wire 60 is small, and the braking force is poor, but in this process, the wire 60 is quickly tensioned, and the brake component 50 is pushed quickly, which is suitable for brake handles with a large lever ratio and a small wire pulling stroke.

[0051] Optionally, Figure 3 is a cross-sectional view of a wire-pull disc brake according to an exemplary embodiment. Figure 3The brake component 50 includes: a brake pad spring 501, which is U-shaped; two brake pads 502, which are symmetrically arranged on the two side arms of the brake pad spring 501 to elastically reset after braking; a guide pin 503, which is inserted into the brake pad spring 501 and fixed on the brake caliper body 10 to fix the brake pad spring 501 in the brake cavity and does not interfere with the movement of the pull rod 20.

[0052] Optionally, refer to Figure 1-3 , the driving member 40 includes: a first push rod 402, which is axially rotated in the active cavity in the middle of the first clamp body 101, and the upper end of which is fixedly assembled with the first end of the pull rod 20 through a pull rod screw 401; an elastic member 404, which is sleeved on the first push rod 402, and its two ends respectively abut the first clamp body 101 and the pull rod 20. In this embodiment, the elastic member 404 is a compression spring; a pressing portion 403, which is integrally formed at the lower end of the first push rod 402, and has a plurality of first water drop ball paths at its upper end; a second push rod 405, which is arranged at the upper part of the pressing portion 403 and fixedly assembled with the active cavity, and its bottom end abuts the brake member 50, and the lower end of the second push rod 405 has a plurality of second water drop ball paths matching the first water drop ball paths; a plurality of transmission balls 406, whose rolling limit is located in a complete water drop ball path of the combination of the first water drop ball path and the second water drop ball path.

[0053] In the technical scheme of the above embodiment, during braking, the first push rod 402 is pulled by the pull rod 20 to rotate axially in the movable cavity, driving the transmission ball 406 to roll in the first water drop ball track, and the top pressure part 403 and the transmission ball 406 change position, and the rolling of the transmission ball 406 will also change position along the second water drop ball track. The two are combined, and the top pressure part 403, the first push rod 402, and the pull rod 20 are all displaced downward, and the brake member 50 is pressed to brake the brake disc; when the force is applied, the elastic force of the elastic member 404 pushes the first push rod 402 to reset upward, and the transmission ball 406 rolls in the opposite direction to drive the first push rod 402 and the pull rod 20 to reset at the same time, thereby ensuring the stable drive of the driving member 40 and the pull rod 20.

[0054] Optionally, refer to the attached Figure 1-2 The first caliper body 101 is integrally formed with an assembly wing 103 for assembling the brake caliper body 10 on a bicycle frame.

[0055] To summarize, the variable radius pull rod structure provided by the embodiment of the utility model can adjust the assembly of the threading pin 304 in the outer plug hole 302 and the inner plug hole 303, thereby changing the distance from the pull wire 60 to the rotation axis of the pull rod 20, and adjusting the bicycle brake handle to adapt to different braking force requirements and assembly requirements; specifically, when the threading pin 304 is assembled in the outer plug hole 302, the pulling torque of the pull wire 60 is large and the braking force is strong, but in this process, the pull wire 60 is slowly tightened and the brake component 50 is pushed slowly, which is suitable for brake handles with a small lever ratio and a large pull wire stroke; when the threading pin 304 is assembled in the inner plug hole 303, the pulling torque of the pull wire 60 is small and the braking force is poor, but in this process, the pull wire 60 is quickly tightened and the brake component 50 is pushed quickly, which is suitable for brake handles with a large lever ratio and a small pull wire stroke.

[0056] Example 2

[0057] The difference between this embodiment and embodiment 1 is that embodiment 2 of the utility model provides a wire-pull disc brake, including the variable radius pull rod structure described in embodiment 1 above, and:

[0058] There are two brake handles, which are symmetrically mounted on both sides of the bicycle handlebar and connected to the second end of the pull wire 60. When the brake handle is held, the brake member 50 is driven to clamp and brake the brake disc.

[0059] To summarize, the variable radius pull rod structure and cable-pull disc brake provided by the embodiment of the utility model can adjust the assembly of the threading pin 304 in the outer plug hole 302 and the inner plug hole 303, thereby changing the distance from the pull wire 60 to the rotation axis of the pull rod 20, and adjusting the bicycle brake handle to adapt to different braking force requirements and assembly requirements; specifically, when the threading pin 304 is assembled in the outer plug hole 302, the pulling torque of the pull wire 60 is large and the braking force is strong, but in this process, the pull wire 60 is slowly tensioned and the brake component 50 is pushed slowly, which is suitable for brake handles with a small lever ratio and a large pull wire stroke; when the threading pin 304 is assembled in the inner plug hole 303, the pulling torque of the pull wire 60 is small and the braking force is poor, but in this process, the pull wire 60 is quickly tensioned and the brake component 50 is pushed quickly, which is suitable for brake handles with a large lever ratio and a small pull wire stroke. In this way, the adaptability of the disc brake assembly is optimized.

[0060] For other structures not described, refer to Example 1.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A variable radius pull rod structure, which is arranged in conjunction with a brake caliper body, the brake caliper body is composed of a first caliper body and a second caliper body, and a brake cavity with one side open is opened in the middle thereof, a brake member is arranged in the brake cavity, and a driving member for pushing the brake member to move so as to clamp the brake disc is arranged in the first caliper body, characterized in that: Included are: A pull rod, a first end of which is rotatably assembled with the upper end of the first caliper body and connected with the driving end of the driving member; The adjusting member comprises: a base, which is fixed to the brake caliper body and is provided with an outer plug hole and an inner plug hole; a threading pin, a first end of which is inserted and assembled in the outer plug hole or the inner plug hole, and a second end of which is provided with a threading hole, a pull wire is passed through the threading hole, and the first end of the pull wire is connected to the second end of the pull rod.

2. The variable radius tie rod structure according to claim 1, characterized in that: A wire pressing plate is provided at the second end of the pull rod, and the wire pressing plate is assembled on the second end of the pull rod through a wire pressing screw to fix the first end of the pull wire.

3. The variable radius tie rod structure according to claim 2, characterized in that: A trumpet-shaped wire drawing groove is integrally formed on one side of the second end of the pull rod corresponding to the threading pin to adapt to the movement trajectory of the pull wire under different working radii.

4. The variable radius tie rod structure according to claim 1, characterized in that: The first end of the threading pin is clamped and limited with an elastic opening retaining ring to assemble the threading pin in the outer plug hole or the inner plug hole.

5. The variable radius tie rod structure according to claim 1, characterized in that: The brake member comprises: The brake pad spring has a U-shaped structure; Brake pads, two in number, symmetrically arranged on the two side arms of the brake pad spring to elastically return to their original position after braking; A guide pin is inserted into the brake pad spring and fixed on the brake caliper body to fix the brake pad spring in the brake cavity and prevent it from interfering with the movement of the pull rod.

6. The variable radius tie rod structure according to claim 5, characterized in that: The driving member comprises: A first push rod, which is axially rotated in the movable cavity in the middle of the first caliper body, and the upper end of which is fixedly assembled with the first end of the pull rod by a pull rod screw; An elastic member, which is sleeved on the first push rod, and whose two ends abut against the first clamp body and the pull rod respectively; A pressing portion, which is integrally formed at the lower end of the first push rod and has a plurality of first water drop ball paths at the upper end; A second push rod is disposed on the upper part of the pressing portion and fixedly assembled with the movable chamber, and its bottom end abuts against the brake member, and the lower end of the second push rod has a plurality of second water drop ball paths that match and correspond to the first water drop ball paths; There are several transmission balls, and their rolling limit is within the complete water drop ball track formed by the combination of the first water drop ball track and the second water drop ball track.

7. The variable radius tie rod structure according to claim 1, characterized in that: The first caliper body is integrally formed with an assembly wing for assembling the brake caliper body on a bicycle frame.

8. A wire-pull disc brake, characterized in that: A variable radius tie rod structure according to any one of claims 1 to 7, and There are two brake handles, which are symmetrically mounted on both sides of the bicycle handlebar and connected to the second end of the pull line. When the brake handle is held, the brake member is driven to clamp and brake the brake disc.

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