Rear derailleur of bicycle
By adding an L-shaped limiting plate to the positioning bolts of the rear derailleur of the bicycle, using the annular limiting part and the arc transition surface, the wear problem caused by the direct contact of the adjustment bolts is solved, and more accurate positioning and more High versatility.
Patent Information
- Application Number
- CN202421324463.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-06-12
AI Technical Summary
The existing bicycle rear derailleur adjustment bolts are in direct contact with the frame surface, resulting in wear and additional machining of the contact surfaces of the adjustment bolts on the frame, increasing production costs and unnecessary wear.
A bicycle rear derailleur was designed. By adding an annular limiting member of the L-shaped limiting plate to the positioning bolt, the adjustment bolt does not directly contact the frame, and the angle adjustment is achieved using the L-shaped limiting plate and the arc-shaped transition surface. , avoiding additional contact surface processing.
The adjustment bolts do not directly contact the frame surface to avoid wear, and at the same time, there is no need to process the contact surface of the adjustment bolts on the frame, improving positioning accuracy and versatility.
Smart Images
Figure CN222329938U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a rear derailleur for a bicycle. Background Art
[0002] The rear derailleur, or rear derailleur for short, is an important component of the speed change system on variable-speed bicycles such as mountain bikes and road bikes. It is responsible for the chain shifting on different flywheels to cope with different road conditions, allowing the rider to use his body more reasonably to drive the bicycle forward. The rear derailleur generally includes a base member, a connecting member, and a chain guide, etc., wherein the base member is usually provided with an adjustment bolt. After the rear derailleur is fixed to the frame, the end of the adjustment bolt directly rests on the frame. The angle between the rear derailleur and the frame can be adjusted by rotating the adjustment bolt. This adjustment method has disadvantages: first, the frame needs to be machined with an abutment surface to ensure that the end of the adjustment bolt can contact the frame and support it stably, which invisibly increases the production cost; second, the adjustment bolt directly contacts the surface of the frame, and when the adjustment bolt rotates, it will cause wear on the contact surface. Utility Model Content
[0003] In view of the shortcomings existing in the above problems, the utility model provides a bicycle rear derailleur.
[0004] To achieve the above object, the utility model provides a bicycle rear derailleur, comprising a base, one end of the base is processed with a positioning hole and connected to the bicycle frame through a positioning bolt, and the other end of the base is connected to a chain guide mechanism through a connecting rod mechanism;
[0005] After the positioning bolt passes through the positioning hole, an annular limiting piece is sleeved and an axial limit is formed through the shaft clamp. The edge of the annular limiting piece is bent to form an integrated L-shaped limiting plate. A positioning seat is provided in the middle of the base. A threaded hole is processed on the positioning seat and an adjusting bolt is installed. The adjusting bolt passes through the rear end of the positioning seat and abuts against the side wall of the L-shaped limiting plate.
[0006] After the base is screwed and fixed to the frame by the positioning bolt, the side of the L-shaped limit plate away from the adjusting bolt abuts against the end of the frame, and the adjusting bolt is used to adjust the angular position of the chain guide mechanism and the frame.
[0007] As a further improvement of the utility model, the positioning bolt includes an optical axis segment and a threaded segment, an annular groove is processed at the connection between the optical axis segment and the threaded segment, the shaft clamp is installed in the annular groove, the outer diameter of the optical axis segment matches the inner diameter of the positioning hole and the annular limit member, and the end of the positioning bolt away from the threaded segment radially extends to form an annular flange, and the annular flange abuts against the edge of the positioning hole.
[0008] As a further improvement of the utility model, the interior of the positioning bolt is hollow to form a through hole, and one end of the through hole close to the annular convex edge is processed to form a hexagonal hole.
[0009] As a further improvement of the utility model, the L-shaped limiting plate is processed on one side facing the adjusting bolt to form an arc-shaped transition surface.
[0010] As a further improvement of the utility model, the central axis of the adjusting bolt and the central axis of the positioning bolt are perpendicular to each other.
[0011] As a further improvement of the utility model, a receiving groove is formed at the connection between the base and the positioning seat for accommodating the adjusting bolt, and a compression spring is sleeved on the adjusting bolt.
[0012] The beneficial effects of the utility model are:
[0013] The derailleur structure adds an annular limiting piece with an L-shaped limiting plate on the positioning bolt, and an adjusting bolt is arranged on the base. After the positioning bolt is screwed and fixed to the bicycle frame, the L-shaped limiting plate abuts against the end of the frame, and the adjusting bolt is rotated to adjust the angle between the chain guide mechanism and the frame. The adjusting bolt does not directly contact the frame and will not damage the surface of the frame. There is no need to additionally process the contact surface of the adjusting bolt on the frame, so the derailleur has good versatility and more accurate positioning. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 The utility model is a three-dimensional bicycle rear derailleur Figure Ⅰ ;
[0015] Figure 2 The utility model is a three-dimensional bicycle rear derailleur Figure II ;
[0016] Figure 3 is a three-dimensional diagram of the base 1;
[0017] Figure 4 It is the front view of the positioning bolt 2;
[0018] Figure 5 It is a front view of the annular limiting member 3;
[0019] Figure 6 It is a side view of the annular limiting member 3;
[0020] Figure 7 It is a schematic diagram of the structure of the shaft card 4.
[0021] In the figure: 1. base; 11. positioning hole; 12. positioning seat; 13. threaded hole; 14. accommodating groove; 2. positioning bolt; 21. annular convex edge; 22. optical axis section; 23. annular groove; 24. threaded section; 25. through hole; 26. hexagonal hole; 3. annular limiter; 31. L-shaped limiter plate; 32. arc-shaped transition surface; 4. shaft clamp; 5. adjusting bolt; 6. compression spring; 7. connecting rod mechanism; 8. chain guide mechanism. DETAILED DESCRIPTION
[0022] like Figure 1-2 As shown, a bicycle rear derailleur described in the utility model comprises a base 1, a positioning hole 11 is processed at one end of the base 1 and is connected to the bicycle frame through a positioning bolt 2, and the other end of the base 1 is connected to a chain guide mechanism 8 through a connecting rod mechanism 7;
[0023] After the positioning bolt 2 passes through the positioning hole 11, an annular limiting piece 3 is sleeved and axially limited by the shaft clamp 4. The edge of the annular limiting piece 3 is bent to form an integrated L-shaped limiting plate 31. A positioning seat 12 is provided in the middle of the base 1. A threaded hole 13 is processed on the positioning seat 12 and an adjusting bolt 5 is installed. The adjusting bolt 5 passes through the rear end of the positioning seat 12 and abuts against the side wall of the L-shaped limiting plate 31. The L-shaped limiting plate 31 is processed to form an arc-shaped transition surface 32 on one side of the adjusting bolt 5. The central axis of the adjusting bolt 5 and the central axis of the positioning bolt 2 are perpendicular to each other.
[0024] After the base 1 is screwed and fixed to the frame by the positioning bolt 2, the side of the L-shaped limit plate 31 away from the adjusting bolt 5 abuts against the end of the frame. The adjusting bolt 5 is used to adjust the angular position of the chain guide mechanism 8 and the frame.
[0025] The positioning bolt 2 includes an optical axis section 22 and a threaded section 24. An annular groove 23 is processed at the connection between the optical axis section 22 and the threaded section 24. The shaft clamp 4 is installed in the annular groove 23. The outer diameter of the optical axis section 22 matches the inner diameter of the positioning hole 11 and the annular limit member 3. The end of the positioning bolt 2 away from the threaded section 24 radially extends to form an annular convex edge 21. The annular convex edge 21 abuts against the edge of the positioning hole 11. The interior of the positioning bolt 2 is hollow to form a through hole 25. The end of the through hole 25 close to the annular convex edge 21 is processed to form a hexagonal hole 26. A accommodating groove 14 is formed at the connection between the base 1 and the positioning seat 12 for accommodating the adjusting bolt 5. The adjusting bolt 5 is sleeved with a compression spring 6.
[0026] The derailleur structure adds an annular limiting piece with an L-shaped limiting plate on the positioning bolt, and an adjusting bolt is arranged on the base. After the positioning bolt is screwed and fixed to the bicycle frame, the L-shaped limiting plate abuts against the end of the frame, and the adjusting bolt is rotated to adjust the angle between the chain guide mechanism and the frame. The adjusting bolt does not directly contact the frame and will not damage the surface of the frame. There is no need to additionally process the contact surface of the adjusting bolt on the frame, so the derailleur has good versatility and more accurate positioning.
[0027] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;
[0028] This application is mainly aimed at improving the positioning bolt structure connecting the base and the frame. The connecting rod mechanism and the chain guide mechanism both adopt the existing relevant technical solutions, which will not be elaborated in detail;
[0029] An annular limiting piece with an L-shaped limiting plate is added to the positioning bolt, and the positioning bolt forms an axial limit through the shaft clamp. During installation, the base is connected to the frame of the bicycle through the positioning bolt, and the L-shaped limiting plate of the annular limiting piece abuts against the end of the frame, and the adjusting bolt in the middle of the base abuts against the other side of the L-shaped limiting plate. The distance between the positioning seat and the L-shaped limiting plate can be adjusted by simply rotating the adjusting bolt. When the adjusting bolt rotates, the base as a whole rotates a certain angle with the positioning bolt as the center, and the connecting rod mechanism and the chain guide mechanism connected to the base rotate synchronously, thereby adjusting the angular position of the chain guide mechanism and the frame.
[0030] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A bicycle rear derailleur, characterized in that: It comprises a base (1), one end of which is processed with a positioning hole (11) and is connected to a bicycle frame via a positioning bolt (2), and the other end of which is connected to a chain guide mechanism (8) via a connecting rod mechanism (7); After the positioning bolt (2) passes through the positioning hole (11), an annular limiting piece (3) is sleeved thereon and axial limiting is formed through an axle clamp (4); the edge of the annular limiting piece (3) is bent to form an integrated L-shaped limiting plate (31); a positioning seat (12) is provided in the middle of the base (1); a threaded hole (13) is machined on the positioning seat (12) and an adjusting bolt (5) is installed thereon; the adjusting bolt (5) passes through the positioning seat (12) and the rear end thereof abuts against the side wall of the L-shaped limiting plate (31); After the base (1) is screwed and fixed to the frame by means of the positioning bolt (2), the side of the L-shaped limit plate (31) away from the adjusting bolt (5) abuts against the end of the frame, and the adjusting bolt (5) is used to adjust the angular position of the chain guide mechanism (8) and the frame.
2. A bicycle rear derailleur according to claim 1, characterized in that: The positioning bolt (2) comprises an optical axis section (22) and a threaded section (24); an annular groove (23) is processed at the connection between the optical axis section (22) and the threaded section (24); the shaft clamp (4) is installed in the annular groove (23); the outer diameter of the optical axis section (22) matches the inner diameter of the positioning hole (11) and the annular limiting member (3); one end of the positioning bolt (2) away from the threaded section (24) radially extends to form an annular convex edge (21); and the annular convex edge (21) abuts against the edge of the positioning hole (11).
3. A bicycle rear derailleur according to claim 2, characterized in that: The interior of the positioning bolt (2) is hollow to form a through hole (25), and one end of the through hole (25) close to the annular convex edge (21) is processed to form a hexagonal hole (26).
4. A bicycle rear derailleur according to claim 1, characterized in that: The side of the L-shaped limiting plate (31) facing the adjusting bolt (5) is processed to form an arc-shaped transition surface (32).
5. A bicycle rear derailleur according to claim 1, characterized in that: The central axis of the adjusting bolt (5) and the central axis of the positioning bolt (2) are perpendicular to each other.
6. A bicycle rear derailleur according to claim 1, characterized in that: A receiving groove (14) is formed at the connection between the base (1) and the positioning seat (12) for accommodating the adjusting bolt (5), and a compression spring (6) is sleeved on the adjusting bolt (5).