Bicycle rear derailleur capable of preventing chain from falling off and bicycle
By setting up a chain guide device on the guide plate of the rear derailleur of the bicycle, the problem of the chain leaving the guide wheel after the in-place speed is solved, preventing the guide plate from being damaged and realizing in-place speed change.
Patent Information
- Application Number
- CN202420741242.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-04-10
AI Technical Summary
After the existing bicycle rear derailleur is shifted in place, the chain is prone to disengage from the guide wheel, resulting in the guide plate being deformed or damaged by the chain hinge.
An anti-chain-off-loading bicycle rear derailleur is designed. By providing a chain guide device on the guide plate, the chain is prevented from being disengaged from the guide wheel, and guide the chain back to position when riding, so that it cooperates with the guide wheel to achieve in-situ speed change.
Effectively prevent the chain from getting off the guide wheel and jamming the guide plate, avoiding damage to the guide plate, and realizing the function of changing the bicycle in situ.
Smart Images
Figure CN222780540U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bicycle derailleurs, in particular to an anti-chain-off bicycle rear derailleur and a bicycle. Background Art
[0002] The rear derailleur in a bicycle, also called the rear transmission, is an important component of the speed change system on variable-speed bicycles such as mountain bikes and road bikes. The rear derailleur is mainly used to guide the chain to one of the toothed discs of the rear sprocket. Since each toothed disc of the rear sprocket has different sizes, the bicycle can achieve the effect of changing gears by matching the chain with different toothed discs. After the chain comes out of the toothed disc, it will pass through the guide wheel and tension wheel of the rear derailleur. With the existing rear derailleur, after the bicycle changes speed in place, the chain will detach from the guide wheel of the rear derailleur. If you continue to ride, the chain will get stuck in the guide plate of the rear derailleur, causing the guide plate of the rear derailleur to be deformed or even damaged by the chain hinge. Utility Model Content
[0003] The utility model aims to overcome the above-mentioned problems and provide a chain-off-proof bicycle rear derailleur, which can realize in-situ speed change and prevent the chain from detaching from the guide wheel of the rear derailleur, thereby avoiding damage to the guide plate of the rear derailleur.
[0004] Another object of the utility model is to provide a bicycle comprising the above-mentioned anti-chain-off bicycle rear derailleur.
[0005] The purpose of the utility model is achieved through the following technical solutions:
[0006] A chain-off-proof bicycle rear derailleur comprises a base member, a movable member, a connecting rod mechanism arranged between the base member and the movable member, and a chain guide arranged on the movable member; one end of the connecting rod mechanism is hinged to the base member, and the other end is hinged to the movable member; wherein,
[0007] The chain guide comprises a guide plate rotatably arranged on the movable component, and a guide wheel and a tension wheel arranged on the guide plate; a chain guiding device for preventing the chain from being separated from the guide wheel is arranged on the guide plate.
[0008] The working principle of the above-mentioned anti-chain-off bicycle rear derailleur is:
[0009] The chain guide device can prevent the chain from detaching from the guide wheel. When the bicycle changes speed in place, the chain detaches from the guide wheel and gets stuck on the guide plate. When riding, the chain guide device guides the chain back to its original position, so that the chain cooperates with the guide wheel to achieve in-place speed change.
[0010] In a preferred embodiment of the utility model, the guide plate includes an inner guide plate and an outer guide plate; the outer guide plate is mounted on the movable member; and one side of the inner guide plate is connected to the outer guide plate through the chain guide device. In the above structure, the chain guide device can not only prevent the chain from falling off, but also fix the inner guide plate and the outer guide plate to each other.
[0011] Furthermore, the guide wheel and the tension wheel are arranged between the inner guide plate and the outer guide plate, the tension wheel is located on the end of the guide plate away from the movable component; the guide wheel is located on the end of the guide plate close to the movable component.
[0012] Preferably, the chain guide device is a screw or a rivet; one end of the screw is connected to the inner guide plate, and the other end of the screw is connected to the outer guide plate; one end of the rivet is riveted to the inner guide plate, and the other end of the rivet is riveted to the outer guide plate. When the chain guide device is a screw, the inner guide plate is directly connected to the outer guide plate by the screw, and the structure is very simple and compact, and the screw can prevent the chain from detaching from the guide wheel, playing the role of guiding the chain; when the chain guide device is a rivet, the structure is simplified, and the rivet can prevent the chain from detaching from the guide wheel, playing the role of guiding the chain.
[0013] Preferably, the chain guide device includes a screw and a nut column, one end of the screw is connected to the inner guide plate, one end of the nut column is connected to the outer guide plate, and the other end of the screw is connected to the other end of the nut column through threaded matching. The screw and the nut column are provided to facilitate installation and disassembly, and the outer surface of the nut column is a cylindrical surface, which can play a better guiding role on the chain.
[0014] Furthermore, the nut column includes a hexagonal column head and a column body; the column body is provided with an internal threaded hole, the hexagonal column head is pressed against the outer guide plate, and the screw is connected with the internal threaded hole. By setting the above structure, after the screw is connected to the nut column, the hexagonal column head will press against the outer guide plate to play a fixing role, and the column body can prevent the chain from detaching from the guide wheel and play a role in guiding the chain.
[0015] Preferably, the column is pressed against the side of the inner guide plate, so that the entire column is located in the gap between the inner guide plate and the outer guide plate, thereby preventing the screw from being damaged by the chain and providing a better guiding effect on the chain.
[0016] Preferably, the outer guide plate is provided with a hexagonal countersunk groove, the hexagonal countersunk groove is provided with a through hole, the column passes through the through hole, and the hexagonal countersunk groove is matched and connected with the hexagonal column head. By setting the above structure, the hexagonal countersunk groove is matched and connected with the hexagonal column head, which can prevent the hexagonal column head from protruding out of the outer guide plate, making the structure more compact, and when the screw is tightened, the nut column can be prevented from rotating, playing a limiting role.
[0017] Preferably, the screw is a hexagon socket screw, and the inner guide plate is provided with a conical countersunk groove, and the conical countersunk groove is matched and connected with the head of the screw, so as to ensure the compactness of the structure and prevent the screw from protruding from the inner guide plate.
[0018] Preferably, the chain guide device includes a screw and a nut column, one end of the screw is connected to the outer guide plate, one end of the nut column is connected to the inner guide plate, and the other end of the screw is connected to the other end of the nut column through threaded matching. The screw and the nut column are provided to facilitate installation and disassembly, and the outer surface of the nut column is a cylindrical surface, which can play a better guiding role on the chain.
[0019] A bicycle comprises the above-mentioned anti-chain-off bicycle rear derailleur.
[0020] Compared with the prior art, the utility model has the following beneficial effects:
[0021] 1. The chain-off-preventing bicycle rear derailleur of the utility model can prevent the chain from being separated from the guide wheel by arranging a chain guide device on the guide plate, and prevent the chain from being stuck on the guide plate after being separated from the guide wheel, thereby damaging the guide plate during riding.
[0022] 2. The chain-off-proof bicycle rear derailleur of the utility model, when the bicycle is shifted in situ, the chain is disengaged from the guide wheel and stuck to the guide plate. When riding, the chain guide device guides the chain back to its original position, so that the chain cooperates with the guide wheel to achieve in situ speed change. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a three-dimensional structural schematic diagram of a first specific implementation manner of an anti-chain-off bicycle rear derailleur in the utility model.
[0024] Figure 2 It is a three-dimensional structural schematic diagram of the chain-off-proof bicycle rear derailleur in the utility model from another viewing angle.
[0025] Figure 3 It is a schematic structural diagram of the rear derailleur in the utility model when the in-situ speed-changing chain is disengaged from the guide wheel.
[0026] Figure 4 The utility model is a schematic diagram of the structure of the rear derailleur during normal speed change riding.
[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the chain guide in the utility model.
[0028] Figure 6 It is an exploded view of the guide plate and chain guide device in the utility model.
[0029] Figure 7 It is a schematic diagram of the three-dimensional structure of the outer guide plate in the utility model.
[0030] Figure 8 It is a three-dimensional structural schematic diagram of the nut column in the utility model.
[0031] Fig. 9 The utility model is a three-dimensional structural schematic diagram of a bicycle. DETAILED DESCRIPTION
[0032] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described below in conjunction with embodiments and drawings, but the implementation methods of the utility model are not limited thereto.
[0033] Example 1
[0034] See also Figure 1-Figure 2 This embodiment discloses an anti-chain-off bicycle rear derailleur, comprising a base member 1, a movable member 2, a connecting rod mechanism 3 arranged between the base member 1 and the movable member 2, and a chain guide arranged on the movable member 2; one end of the connecting rod mechanism 3 is hinged to the base member 1, and the other end is hinged to the movable member 2.
[0035] See also Figure 1-Figure 5 The chain guide includes a guide plate 4 rotatably arranged on the movable member 2 and a guide wheel 5 and a tension wheel 6 arranged on the guide plate 4; the guide plate 4 is provided with a chain guiding device 7 for preventing the chain 9 from escaping from the guide wheel 5.
[0036] See also Figure 1-Figure 4 , the connecting rod mechanism 3 includes a first connecting rod 3-1 and a second connecting rod 3-2; wherein one end of the first connecting rod 3-1 is hinged to the base member 1, and the other end is hinged to the movable member 2; one end of the second connecting rod 3-2 is hinged to the base member 1, and the other end is hinged to the movable member 2. In the above structure, the base member 1, the first connecting rod 3-1, the second connecting rod 3-2 and the movable member 2 constitute a four-bar connecting rod mechanism, which can realize the movable connection between the base member 1 and the movable member 2. The movable member 2 moves relative to the base member 1, driving the chain guide to move, and the chain 9 is transferred from one wheel disc of the rear sprocket 10 to another wheel disc, thereby realizing the adjustment of the gear position.
[0037] See also Figure 1-Figure 4 , the base component 1 is installed on a bicycle frame 8.
[0038] See also Figure 1-Figure 6 , the guide plate 4 includes an inner guide plate 4-1 and an outer guide plate 4-2; one side of the inner guide plate 4-1 and the outer guide plate 4-2 is connected through the chain guide device 7. In the above structure, the chain guide device 7 can not only prevent the chain from falling off, but also fix the inner guide plate 4-1 and the outer guide plate 4-2 to each other. In the case that the chain 9 escapes from the guide wheel 5 and falls back, the chain guide device 7 can prevent the chain 9 from getting stuck on the inner guide plate 4-1, and guide the chain 9 back to its original position when the bicycle is pedaled forward, thereby preventing the chain from falling off and protecting the rear derailleur from being damaged.
[0039] See also Figure 1-Figure 6 , the outer guide plate 4 - 2 is installed on the movable component 2.
[0040] See also Figure 1-Figure 5 The guide wheel 5 and the tensioning wheel 6 are arranged between the inner guide plate 4-1 and the outer guide plate 4-2. The tensioning wheel 6 is located on the end of the guide plate 4 away from the movable component 2; the guide wheel 5 is located on the end of the guide plate 4 close to the movable component 2.
[0041] See also Figure 2-Figure 6 The chain guide device 7 includes a screw 7-1 and a nut column 7-2. One end of the screw 7-1 is connected to the inner guide plate 4-1, one end of the nut column 7-2 is connected to the outer guide plate 4-2, and the other end of the screw 7-1 is connected to the other end of the nut column 7-2 through threaded matching. The screw 7-1 and the nut column 7-2 are provided to facilitate installation and disassembly, and the outer surface of the nut column 7-2 is a cylindrical surface, which can play a better guiding role on the chain 9.
[0042] See also Figure 6-Figure 8 The nut column 7-2 includes a hexagonal column head 7-21 and a column body 7-22; the column body 7-22 is provided with an internal threaded hole 7-23, the hexagonal column head 7-21 is pressed against the outer guide plate 4-2, and the screw 7-1 is connected with the internal threaded hole 7-23. By setting the above structure, after the screw 7-1 is connected to the nut column 7-2, the hexagonal column head 7-21 will press against the outer guide plate 4-2 to fix it, and the column body 7-22 can prevent the chain 9 from detaching from the guide wheel 5, and play a role in guiding the chain 9.
[0043] See also Figure 6-Figure 8The column 7-22 is pressed against the side of the inner guide plate 4-1. The purpose is to make the entire column 7-22 located in the gap between the inner guide plate 4-1 and the outer guide plate 4-2, thereby preventing the screw 7-1 from being damaged by the chain 9 and at the same time, providing a better guiding effect on the chain 9.
[0044] See also Figure 6-Figure 8 The outer guide plate 4-2 is provided with a hexagonal countersunk groove 4-21, and the hexagonal countersunk groove 4-21 is provided with a through hole 4-22. The column 7-22 passes through the through hole 4-22, and the hexagonal countersunk groove 4-21 is connected with the hexagonal column head 7-21. By setting the above structure, the hexagonal countersunk groove 4-21 is connected with the hexagonal column head 7-21, which can prevent the hexagonal column head 7-21 from protruding out of the outer guide plate 4-2, making the structure more compact. When the screw 7-1 is turned, the nut column 7-2 can be prevented from rotating, which plays a limiting role.
[0045] See also Figure 6-Figure 8 The screw 7-1 is a hexagon socket screw, and the inner guide plate 4-1 is provided with a conical countersunk groove 4-11, and the conical countersunk groove 4-11 is connected with the head of the screw 7-1. The conical countersunk groove 4-11 is provided with a round hole 4-12, and the screw 7-1 passes through the round hole 4-12. The purpose is to ensure the compactness of the structure and prevent the screw 7-1 from protruding from the inner guide plate 4-1. The diameter of the round hole 4-12 is smaller than the diameter of the column 7-22, so that the end of the column 7-22 can be pressed against the side of the inner guide plate 4-1 when fixed.
[0046] See also Figure 1-Figure 6 The working principle of the above-mentioned anti-chain-off bicycle rear derailleur is:
[0047] The chain guide device 7 can prevent the chain 9 from detaching from the guide wheel 5. When the bicycle changes speed in place, the chain 9 detaches from the guide wheel 5 and gets stuck on the guide plate 4. When riding forward, the chain guide device 7 guides the chain 9 back to its original position, so that the chain 9 cooperates with the guide wheel 5 to achieve in-place speed change.
[0048] Example 2
[0049] The other structures in this embodiment are the same as those in Embodiment 1, except that:
[0050] The chain guide device 7 includes a screw 7-1 and a nut column 7-2, one end of the screw 7-1 is connected to the outer guide plate 4-2, one end of the nut column 7-2 is connected to the inner guide plate 4-1, and the other end of the screw 7-1 is connected to the other end of the nut column 7-2 through threaded matching. The screw 7-1 and the nut column 7-2 are provided to facilitate installation and disassembly, and the outer surface of the nut column 7-2 is a cylindrical surface, which can play a better guiding role on the chain 9.
[0051] The hexagonal countersunk groove 4-21 is arranged on the inner guide plate 4-1, and the conical countersunk groove 4-11 is arranged on the outer guide plate 4-2.
[0052] Example 3
[0053] The other structures in this embodiment are the same as those in the embodiment 1, except that: the chain guide device 7 is a screw 7-1, one end of the screw 7-1 is connected to the inner guide plate 4-1, and the other end is connected to the outer guide plate 4-2. The inner guide plate 4-1 is directly connected to the outer guide plate 4-2 by the screw 7-1, and the structure is very simple and compact, and the screw 7-1 can prevent the chain 9 from detaching from the guide wheel 5, and plays a role in guiding the chain 9.
[0054] Example 4
[0055] The other structures in this embodiment are the same as those in the embodiment 1, except that: the chain guide device 7 is a guide pin, one end of which is connected to the inner guide plate 4-1, and the other end is connected to the outer guide plate 4-2. The guide pin can also fix the inner guide plate 4-1 and prevent the chain 9 from detaching from the guide wheel 5.
[0056] Example 5
[0057] The other structures in this embodiment are the same as those in the embodiment 1, except that: the chain guide device 7 is a rivet; one end of the rivet is riveted to the inner guide plate, and the other end of the rivet is riveted to the outer guide plate. By providing the rivet, the structure is simplified, and the rivet can prevent the chain from detaching from the guide wheel, thereby playing the role of guiding the chain.
[0058] Example 6
[0059] See also Fig. 9 This embodiment discloses a bicycle, including a bicycle body 11 and an anti-chain-off bicycle rear derailleur as described in any one of Embodiments 1-4, which is arranged on the bicycle body 11, and the bicycle body 11 includes the bicycle frame 8.
[0060] The above is a preferred implementation mode of the present invention, but the implementation mode of the present invention is not limited by the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.
Claims
1. A chain-off-proof bicycle rear derailleur, comprising a base member, a movable member, a connecting rod mechanism disposed between the base member and the movable member, and a chain guide disposed on the movable member; one end of the connecting rod mechanism is hinged to the base member, and the other end is hinged to the movable member; characterized in that: The chain guide comprises a guide plate rotatably arranged on the movable component, and a guide wheel and a tension wheel arranged on the guide plate; a chain guiding device for preventing the chain from being separated from the guide wheel is arranged on the guide plate.
2. The anti-chain-off bicycle rear derailleur according to claim 1, characterized in that: The guide plate includes an inner guide plate and an outer guide plate; the outer guide plate is installed on the movable component; and one side of the inner guide plate is connected to the outer guide plate through the chain guide device.
3. The anti-chain-off bicycle rear derailleur according to claim 2, characterized in that: The chain guiding device is a screw or a rivet; one end of the screw is connected to the inner guide plate, and the other end of the screw is connected to the outer guide plate; one end of the rivet is riveted to the inner guide plate, and the other end of the rivet is riveted to the outer guide plate.
4. The anti-chain-off bicycle rear derailleur according to claim 2, characterized in that: The chain guiding device comprises a screw and a nut column, one end of the screw is connected to the inner guide plate, one end of the nut column is connected to the outer guide plate, and the other end of the screw is connected to the other end of the nut column through threaded cooperation.
5. The anti-chain-off bicycle rear derailleur according to claim 4, characterized in that: The nut column includes a hexagonal column head and a column body; the column body is provided with an internal threaded hole, the hexagonal column head is pressed tightly against the outer guide plate, and the screw is matched and connected with the internal threaded hole.
6. The anti-chain-off bicycle rear derailleur according to claim 5, characterized in that: The column is pressed against the side surface of the inner guide plate.
7. The anti-chain-off bicycle rear derailleur according to claim 5, characterized in that: The outer guide plate is provided with a hexagonal countersunk groove, the hexagonal countersunk groove is provided with a through hole, the column passes through the through hole, and the hexagonal countersunk groove is matched and connected with the hexagonal column head.
8. The anti-chain-off bicycle rear derailleur according to claim 4, characterized in that: The screw is a hexagon socket screw, and the inner guide plate is provided with a conical countersunk groove, and the conical countersunk groove is matched and connected with the head of the screw.
9. The anti-chain-off bicycle rear derailleur according to claim 2, characterized in that: The chain guiding device comprises a screw and a nut column, one end of the screw is connected to the outer guide plate, one end of the nut column is connected to the inner guide plate, and the other end of the screw is connected to the other end of the nut column through threaded cooperation.
10. A bicycle, characterized in that: The invention comprises the chain-off-preventing bicycle rear derailleur as claimed in any one of claims 1 to 9.