Electric rear derailleur and bicycle

Abstract

The utility model discloses an electric rear derailleur and a bicycle. The electric rear derailleur comprises a base unit, an electric drive unit, a connecting unit and a movable guide chain unit. The electric drive unit is arranged on the base unit and comprises an electric drive piece and an electric drive transmission assembly. The electric drive transmission assembly is connected between the electric drive piece and the connecting unit and comprises a transmission shaft and an anti-collision clutch structure. The transmission shaft is rotationally connected; the anti-collision clutch structure is arranged between the transmission shaft and the connecting unit, and the anti-collision clutch structure is provided with safe torque; when the torque generated by external force impact is larger than the set safety torque, power transmission between the transmission shaft and the connecting unit is disconnected. According to the electric rear derailleur, the risk that the driving unit is damaged due to the fact that the electric rear derailleur is impacted can be avoided, the service life can be effectively prolonged, and the vehicle using cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to a rear derailleur, in particular to an electric rear derailleur and a bicycle. Background Art

[0002] The bicycle electronic rear derailleur is used to guide the chain to one of the toothed discs of the rear sprocket. Since each toothed disc of the rear sprocket has a different size, the bicycle can achieve the effect of changing gears through the cooperation between the chain and different toothed discs.

[0003] Since the bicycle electronic rear derailleur is often impacted by external forces during riding or during transportation and storage of the bicycle, the external force impact may be transmitted to the drive unit, thereby posing a risk of damaging the drive unit. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned problems and provide an electric rear derailleur, which can avoid the risk of damaging the drive unit due to collision, effectively prolong the service life and reduce the cost of using the vehicle.

[0005] Another object of the utility model is to provide a bicycle.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] An electric rear derailleur comprises a base unit, an electric drive unit, a connection unit and a movable chain guide unit;

[0008] The electric drive unit is arranged on the base unit, and the electric drive unit includes an electric drive member and an electric drive transmission assembly; the electric drive transmission assembly is connected between the electric drive member and the connection unit, and the electric drive transmission assembly includes a transmission shaft and an anti-collision clutch structure; the transmission shaft is rotatably connected; the anti-collision clutch structure is arranged between the transmission shaft and the connection unit, and a safety torque is provided on the anti-collision clutch structure;

[0009] When the torque generated by the external force impact is greater than the set safety torque, the power transmission between the transmission shaft and the connection unit is disconnected.

[0010] The working principle of the above electric rear derailleur is:

[0011] During vehicle use, when the vehicle is subjected to external impact and the torque generated by the impact is greater than the set safety torque, the anti-collision clutch structure disconnects the power connection between the transmission shaft and the connecting unit. At this time, the connecting unit and the transmission shaft are in a disconnected state, thereby preventing the external force on the movable chain guide unit or the connecting unit from being transmitted to the drive unit, greatly reducing the risk of damage to the drive unit, effectively extending the service life and reducing the cost of vehicle use.

[0012] Specifically, the torque of the driving connection unit to move and switch gears is less than a set safety torque to avoid a disconnection state when adjusting the gear.

[0013] In a preferred embodiment of the utility model, the anti-collision clutch structure includes two one-way clutches, the torque directions of the two one-way clutches are opposite; the one-way clutch is provided with a safety torque in the transmission direction; when the torque generated by the external force impact is greater than the safety torque, the one-way clutch loses the power transmission capability;

[0014] The connecting unit includes two groups of connecting rods, one group of connecting rods is connected between the base unit and the movable chain guide unit, and the other group of connecting rods is connected between the transmission shaft of the electric drive unit and the movable chain guide unit; the other group of connecting rods includes two connecting rods, and the two connecting rods are respectively connected to the two ends of the transmission shaft or to the same end of the transmission shaft through two one-way clutches. Through the above structure, when it is necessary to adjust the gear position, such as upshifting, the electric drive unit is driven by operating the speed change button. At this time, the transmission shaft rotates in the corresponding direction, and one of the one-way clutches corresponding to the direction is responsible for transmitting the power (the other clutch is idling), thereby completing the upshifting operation. On the contrary, when it is necessary to downshift, the transmission shaft rotates in the other direction, and at the same time drives the corresponding connecting rod of the connecting unit to swing through another clutch, thereby completing the downshifting operation. Similarly, when subjected to external impact and the torque generated by the impact is greater than the set safety torque, one of the one-way clutches corresponding to the direction of the impact loses the power transmission function in that direction, which is equivalent to the one-way clutch becoming a two-way clutch, while the other one-way clutch is in a free state in this direction, so the two one-way clutches will not transmit external force to the transmission shaft to protect the electric drive unit structure.

[0015] Furthermore, the one-way clutch is a one-way bearing, which is coaxially sleeved on the transmission shaft and connected to the connecting rod of the connecting unit.

[0016] In a preferred embodiment of the present invention, the electric drive unit further comprises an electric drive housing; the electric drive member and the electric drive transmission assembly are arranged in the electric drive housing.

[0017] Furthermore, the transmission shaft is rotatably connected to the electric drive housing, and both ends of the transmission shaft extend outside the electric drive housing.

[0018] In a preferred embodiment of the utility model, the electric drive transmission assembly further comprises a gear transmission structure and a worm gear structure, and the gear transmission structure and the worm gear structure are connected between the electric drive member and the transmission shaft.

[0019] A bicycle comprises the above-mentioned electric rear derailleur.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] In the electric rear derailleur of the utility model, when it is subjected to external impact and the torque generated by the impact is greater than the set safety torque, the anti-collision clutch structure disconnects the power connection between the transmission shaft and the connecting unit. At this time, the connecting unit and the transmission shaft are in a disconnected state, thereby preventing the external force on the movable chain guide unit or the connecting unit from being transmitted to the drive unit, greatly reducing the risk of damage to the drive unit, effectively extending the service life and reducing the cost of using the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1-2 The three-dimensional structural schematic diagrams of the electric rear derailleur of the utility model are shown in two different viewing angles.

[0023] Figure 3 It is a side view of one set of connecting rods of the electric drive unit and the connecting unit of the utility model.

[0024] Figure 4 It is a side exploded view of one set of connecting rods of the electric drive unit and the connecting unit of the utility model.

[0025] Figure 5 This is a three-dimensional structural schematic diagram of one group of connecting rods of the electric drive unit and the connecting unit of the utility model, in which the electric drive housing is hidden. DETAILED DESCRIPTION

[0026] 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.

[0027] See also Figure 1-2 The bicycle of this embodiment includes an electric rear derailleur, which includes a base unit 1, an electric drive unit 2, a connecting unit 3 and a movable chain guide unit 4.

[0028] See also Figure 1-5 The electric drive unit 2 is arranged on the base unit 1, and the electric drive unit 2 includes an electric drive housing 2-1, an electric drive component 2-2 and an electric drive transmission assembly; the electric drive component 2-2 and the electric drive transmission assembly are arranged in the electric drive housing 2-1; the electric drive transmission assembly is connected between the electric drive component 2-2 and the connecting unit 3, and the electric drive transmission assembly includes a transmission shaft 2-3 and an anti-collision clutch structure; the transmission shaft 2-3 is rotationally connected to the electric drive housing 2-1, and both ends of the transmission shaft 2-3 extend outside the electric drive housing 2-1; the anti-collision clutch structure is arranged between the transmission shaft 2-3 and the connecting unit 3, and a safety torque is provided on the anti-collision clutch structure; when the torque generated by the external force impact is greater than the set safety torque, the power transmission between the transmission shaft 2-3 and the connecting unit 3 is disconnected.

[0029] See also Figure 3-5 , the anti-collision clutch structure includes two one-way clutches 2-4, the torque directions of the two one-way clutches 2-4 are opposite; the one-way clutch 2-4 is provided with a safety torque in the transmission direction; when the torque generated by the external force impact is greater than the safety torque, the one-way clutch 2-4 loses the power transmission capability; the connection unit 3 includes two groups of connecting rods 3-1, one of which is connected between the base unit 1 and the movable chain guide unit 4, and the other group of connecting rods 3-1 is connected between the transmission shaft 2-3 of the electric drive unit 2 and the movable chain guide unit 4; the other group of connecting rods 3-1 includes two connecting rods 3-1, and the two connecting rods 3-1 are respectively connected to the two ends of the transmission shaft 2-3 through two one-way clutches 2-4. Through the above structure, when the gear position needs to be adjusted, such as shifting, the electric drive unit 2 is driven by operating the speed change button, and the transmission shaft 2-3 rotates in the corresponding direction, and one of the one-way clutches 2-4 corresponding to the direction is responsible for transmitting the power (the other clutch is idling), thereby completing the shifting operation. On the contrary, when downshifting is required, the transmission shaft 2-3 rotates in the other direction, and at the same time drives the connecting rod 3-1 corresponding to the connecting unit 3 to swing through another clutch, thereby completing the downshifting operation. Similarly, when subjected to external impact and the torque generated by the impact is greater than the set safety torque, one of the one-way clutches 2-4 corresponding to the impact direction loses the power transmission function in that direction, which is equivalent to the one-way clutch 2-4 becoming a two-way clutch, and the other one-way clutch 2-4 is in a free state in this direction, so the two one-way clutches 2-4 will not transmit external force to the transmission shaft 2-3 to protect the structure of the electric drive unit 2.

[0030] Further, the one-way clutch 2-4 is a one-way bearing, which is coaxially sleeved on the transmission shaft 2-3 and connected to the connecting rod 3-1 of the connecting unit 3. Specifically, the structure of the one-way bearing can refer to the prior art, such as a one-way bearing in a rear derailleur with an additional rotation resistance function disclosed in application publication number CN106741556A; or other clutches capable of achieving similar functions can be used.

[0031] Furthermore, the electric drive transmission assembly also includes a gear transmission structure and a worm gear structure, and the gear transmission structure and the worm gear structure are connected between the electric drive member 2-2 and the transmission shaft 2-3.

[0032] See also Figure 1-4 The working principle of the electric rear derailleur of this embodiment is as follows:

[0033] During vehicle use, when the vehicle is subjected to external impact and the torque generated by the impact is greater than the set safety torque (the safety torque can be selected according to actual needs, and it is more appropriate to be slightly larger than the torque for switching gears), the anti-collision clutch structure disconnects the power connection between the transmission shaft 2-3 and the connecting unit 3. At this time, the connecting unit 3 and the transmission shaft 2-3 are in a disconnected state, thereby preventing the external force on the movable chain guide unit 4 or the connecting unit 3 from being transmitted to the drive unit, greatly reducing the risk of damage to the drive unit, effectively extending the service life and reducing the cost of using the vehicle.

[0034] Specifically, the torque for driving the connection unit 3 to move and switch gears is less than a set safety torque to avoid a disconnection state when adjusting the gear.

[0035] 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. An electric rear derailleur, comprising a base unit, an electric drive unit, a connecting unit and a movable chain guide unit; characterized in that: The electric drive unit is arranged on the base unit, and the electric drive unit includes an electric drive member and an electric drive transmission assembly; the electric drive transmission assembly is connected between the electric drive member and the connection unit, and the electric drive transmission assembly includes a transmission shaft and an anti-collision clutch structure; the transmission shaft is rotationally connected; the anti-collision clutch structure is arranged between the transmission shaft and the connection unit, and the anti-collision clutch structure is provided with a safety torque; When the torque generated by the external force impact is greater than the set safety torque, the power transmission between the transmission shaft and the connection unit is disconnected.

2. The electric rear derailleur according to claim 1, characterized in that: The anti-collision clutch structure includes two one-way clutches, the torque directions of the two one-way clutches are opposite; the one-way clutch is provided with a safety torque in the transmission direction; when the torque generated by the external force impact is greater than the safety torque, the one-way clutch loses the power transmission capability; The connecting unit includes two groups of connecting rods, one group of connecting rods is connected between the base unit and the movable chain guide unit, and the other group of connecting rods is connected between the transmission shaft of the electric drive unit and the movable chain guide unit; the other group of connecting rods includes two connecting rods, and the two connecting rods are respectively connected to the two ends of the transmission shaft or to the same end of the transmission shaft through two one-way clutches.

3. The electric rear derailleur according to claim 2, characterized in that: The one-way clutch is a one-way bearing, which is coaxially sleeved on the transmission shaft and connected to the connecting rod of the connecting unit.

4. The electric rear derailleur according to claim 1, characterized in that: The electric drive unit also includes an electric drive housing; the electric drive component and the electric drive transmission assembly are arranged in the electric drive housing.

5. The electric rear derailleur according to claim 4, characterized in that: The transmission shaft is rotatably connected to the electric drive housing, and both ends of the transmission shaft extend outside the electric drive housing.

6. The electric rear derailleur according to claim 1, characterized in that: The electric drive transmission assembly also includes a gear transmission structure and a worm gear structure, and the gear transmission structure and the worm gear structure are connected between the electric drive member and the transmission shaft.

7. A bicycle, characterized in that: The electric rear derailleur comprises the electric rear derailleur according to any one of claims 1 to 6.

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