Bicycle electric drive rear derailleur and bicycle

Abstract

The utility model discloses a bicycle electric drive rear derailleur and a bicycle. The 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 arranged and is connected with the connecting unit through the anti-collision clutch structure; when the external impact force is larger than the set resistance moment and the external impact amplitude is larger than the set resistance amplitude, the anti-collision clutch structure disconnects power transmission between the transmission shaft and the connecting unit. The electric-drive rear derailleur of the bicycle can avoid the risk that the driving unit is damaged due to collision, the service life can be effectively prolonged, and the bicycle using cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to a rear derailleur, in particular to an electric-driven rear derailleur for a bicycle 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. Since the bicycle electronic rear derailleur is often hit by external forces during the rider's riding process or during the transportation and storage of the bicycle, the external force collision can be transmitted to the drive unit, thereby posing a risk of damaging the drive unit. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned problems and provide a bicycle electric drive 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 bicycle.

[0004] Another object of the utility model is to provide a bicycle.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A bicycle electric drive rear derailleur comprises a base unit, an electric drive unit, a connecting unit and a movable chain guide unit;

[0007] The electric drive unit is arranged on the base unit, and the electric drive unit includes an electric drive component and an electric drive transmission assembly; the electric drive transmission assembly is connected between the electric drive component 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 arranged and connected to the connection unit through the anti-collision clutch structure; when the external impact force is greater than the set resistance torque and the external impact amplitude is greater than the set resistance amplitude, the anti-collision clutch structure disconnects the power transmission between the transmission shaft and the connection unit.

[0008] The working principle of the above bicycle electric drive rear derailleur is as follows:

[0009] During operation, when the external impact force is greater than the set resistance torque and the external impact amplitude is greater than the set resistance amplitude, 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.

[0010] In a preferred embodiment of the utility model, the anti-collision clutch structure includes an anti-collision clutch shaft, a docking cylinder, a power connection rod and a reset spring;

[0011] The two ends of the inner cavity of the docking cylinder are respectively provided with a first power connection groove and a second power connection groove; the first power connection groove is provided with two inclined and symmetrically arranged disconnection transmission side surfaces;

[0012] The power connection rod comprises a first power connection rod and a second power connection rod;

[0013] The anti-collision clutch shaft is rotatably connected, one end of the anti-collision clutch shaft is fixedly connected to the connection unit, and the other end of the anti-collision clutch shaft extends to one end of the inner cavity of the docking cylinder; one end of the first power connection rod is fixedly connected to the other end of the anti-collision clutch shaft, and in the engaged state, the other end of the first power connection rod extends to the first power connection groove; when the external force drives the anti-collision clutch shaft to rotate, the first power connection rod drives the docking cylinder to move axially through the disconnection transmission side to move away from the anti-collision clutch shaft;

[0014] One end of the transmission shaft extends to the other end of the inner cavity of the docking cylinder; one end of the second power connection rod is fixedly connected to the end of the transmission shaft extending to the inner cavity of the docking cylinder, and the other end of the second power connection rod extends to the second power connection groove;

[0015] The return spring is sleeved on the transmission shaft, one end of the return spring presses against the docking cylinder, and the other end of the return spring presses against the fixed part of the transmission shaft or other electric drive transmission components.

[0016] Through the above structure, when the external impact force is greater than the set resistance torque and the external impact amplitude is greater than the set resistance amplitude, the connection unit drives the anti-collision clutch shaft and the first power connection rod to rotate; because the first power connection groove matched with the first power connection rod is provided with two inclined and symmetrically arranged disconnection transmission side surfaces, when the first power connection rod rotates around the axis of the anti-collision clutch shaft, the first power connection rod is squeezed on the inclined disconnection transmission side surface, generating a component force parallel to the axis of the anti-collision clutch shaft, and under the limiting guide of the second power connection rod, the docking cylinder is driven to move axially (at this time, the reset spring is compressed and stored) to move it away from the anti-collision clutch shaft (first power connection rod); during this period, the first power connection rod gradually rotates in the corresponding direction until the first power connection groove is completely separated from the first power connection rod, and at this time it is in a disconnected state, thereby avoiding damage to the drive unit caused by external force, and the structure is very clever. When the external force disappears, by manual operation or operating the speed change button, the first power connection rod can be driven by the reset spring to enter the first power connection groove again and return to the engaged state. Specifically, the force acting on the driving connection unit to move and switch gears should be smaller than the set resistance force to avoid disconnection when adjusting the gears.

[0017] Furthermore, the axis of the first power connection rod is perpendicular to the axis of the transmission shaft; the axis of the second power connection rod is perpendicular to the axis of the transmission shaft.

[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] 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.

[0020] In a preferred embodiment of the present invention, the connecting unit comprises two groups of connecting rods, one group of connecting rods is connected between the electric drive unit and the movable chain guide unit, and the other group of connecting rods is connected between the base unit and the movable chain guide unit.

[0021] Furthermore, one of the groups of connecting rods includes two connecting rods, one end of one of the connecting rods is fixedly connected to the anti-collision clutch shaft of the electric drive unit, and the other end of one of the connecting rods is rotatably connected to the movable chain guide unit; one end of the other connecting rod is rotatably connected to the transmission shaft of the electric drive unit, and the other end of the other connecting rod is rotatably connected to the movable chain guide unit.

[0022] A bicycle comprises the above-mentioned bicycle electric drive rear derailleur.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The utility model of the bicycle electric drive rear derailleur adds an anti-collision clutch structure between the transmission shaft and the connection unit of the electric drive transmission assembly. When the external impact force is greater than the set resistance torque and the external impact amplitude is greater than the set resistance amplitude, the anti-collision clutch structure automatically disconnects the power transmission between the transmission shaft and the connection unit, thereby preventing the external force on the movable chain guide unit or the connection 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

[0025] Figure 1-2 The three-dimensional structure diagrams of the bicycle electric drive rear derailleur of the utility model are shown in two different viewing angles.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of one group of connecting rods of the electric drive unit and the connecting unit of the utility model.

[0027] Figure 4 The figure is a side view of the electric drive unit of the utility model after the shell is hidden.

[0028] Figure 5 The utility model is a schematic diagram of the three-dimensional structure of the electric drive unit after the shell is hidden.

[0029] Figure 6 It is a three-dimensional structural schematic diagram of the transmission shaft and the anti-collision clutch structure of the electric drive unit of the utility model in the engaged state.

[0030] Figure 7 It is a three-dimensional structural schematic diagram of the transmission shaft and the anti-collision clutch structure of the electric drive unit of the utility model in the disconnected state. DETAILED DESCRIPTION

[0031] 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.

[0032] See also Figure 1-2 The bicycle of this embodiment includes a bicycle electric drive rear derailleur, and the bicycle electric drive rear derailleur includes a base unit 1, an electric drive unit 2, a connecting unit 3 and a movable chain guide unit 4.

[0033] See also Figure 1-3The 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 (motor) 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 rotatably arranged and connected to the connecting unit 3 through the anti-collision clutch structure; when the external impact force is greater than the set resistance torque and the external impact amplitude is greater than the set resistance amplitude, the anti-collision clutch structure disconnects the power transmission between the transmission shaft 2-3 and the connecting unit 3.

[0034] See also Figure 4-7 The anti-collision clutch structure includes an anti-collision clutch shaft 2-4, a docking cylinder 2-5, a power connection rod and a reset spring 2-6; the two ends of the inner cavity of the docking cylinder 2-5 are respectively provided with a first power connection groove 2-5-1 and a second power connection groove 2-5-2; the first power connection groove 2-5-1 is provided with two inclined and symmetrically arranged disconnecting transmission side surfaces; the power connection rod includes a first power connection rod 2-7 and a second power connection rod 2-8; the anti-collision clutch shaft 2-4 is rotatably connected, one end of the anti-collision clutch shaft 2-4 is fixedly connected to the connecting unit 3, and the other end of the anti-collision clutch shaft 2-4 extends to one end of the inner cavity of the docking cylinder 2-5; one end of the first power connection rod 2-7 is fixedly connected to the other end of the anti-collision clutch shaft 2-4, and in the engaged state, the first power connection rod 2 -7 extends to the first power connection groove 2-5-1; when the external force drives the anti-collision clutch shaft 2-4 to rotate, the first power connection rod 2-7 drives the docking cylinder 2-5 to move axially away from the anti-collision clutch shaft 2-4 through the disconnected transmission side; one end of the transmission shaft 2-3 extends to the other end of the inner cavity of the docking cylinder 2-5; one end of the second power connection rod 2-8 is fixedly connected to one end of the transmission shaft 2-3 extending to the inner cavity of the docking cylinder 2-5, and the other end of the second power connection rod 2-8 extends to the second power connection groove 2-5-2; the reset spring 2-6 is sleeved on the transmission shaft 2-3, one end of the reset spring 2-6 is against the docking cylinder 2-5, and the other end of the reset spring 2-6 is against the fixed part of the transmission shaft 2-3 or other electric drive transmission components.

[0035] Through the above structure, when the external impact force is greater than the set resistance torque and the external impact amplitude is greater than the set resistance amplitude, the connecting unit 3 drives the anti-collision clutch shaft 2-4 and the first power connecting rod 2-7 to rotate; since the first power connecting groove 2-5-1 matched with the first power connecting rod 2-7 is provided with two inclined and symmetrically arranged disconnecting transmission side surfaces, when the first power connecting rod 2-7 rotates around the axis of the anti-collision clutch shaft 2-4, the first power connecting rod 2-7 is squeezed on the inclined disconnecting transmission side surface, generating a parallel to the anti-collision clutch shaft 2-4. The force acting on the axis of the collision clutch shaft 2-4 drives the docking cylinder 2-5 to move axially (the reset spring 2-6 is compressed and stores energy) under the limiting guidance of the second power connection rod 2-8, so that it is away from the anti-collision clutch shaft 2-4 (the first power connection rod 2-7); during this period, the first power connection rod 2-7 gradually rotates in the corresponding direction until the first power connection groove 2-5-1 is completely separated from the first power connection rod 2-7, and it is in a disconnected state at this time, thereby avoiding damage to the drive unit caused by external forces. The structure is very clever. When the external force disappears, by manual operation or operation of the speed change button, the first power connection rod 2-7 can be driven by the reset spring 2-6 to re-enter the first power connection groove 2-5-1 and return to the engaged state. Specifically, the force or amplitude of the drive connection unit 3 to move and switch gears must be less than the set resistance to avoid a disconnected state when adjusting the gear.

[0036] Furthermore, the axis of the first power connecting rod 2-7 is perpendicular to the axis of the transmission shaft 2-3; the axis of the second power connecting rod 2-8 is perpendicular to the axis of the transmission shaft 2-3.

[0037] 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.

[0038] See also Figure 3-4 The connecting unit 3 includes two groups of connecting rods 3-1, one group of connecting rods 3-1 is connected between the electric drive unit 2 and the movable chain guide unit 4, and the other group of connecting rods 3-1 is connected between the base unit 1 and the movable chain guide unit 4.

[0039] Furthermore, one of the groups of connecting rods 3-1 includes two connecting rods 3-1, one end of one of the connecting rods 3-1 is fixedly connected to the anti-collision clutch shaft 2-4 of the electric drive unit 2, and the other end of one of the connecting rods 3-1 is rotatably connected to the movable chain guide unit 4; one end of the other connecting rod 3-1 is rotatably connected to the transmission shaft 2-3 of the electric drive unit 2, and the other end of the other connecting rod 3-1 is rotatably connected to the movable chain guide unit 4.

[0040] See also Figure 1-3The working principle of the bicycle electric drive rear derailleur of this embodiment is as follows:

[0041] When working, in the absence of external force or when the external force is small, the anti-collision clutch structure engages the power connection between the transmission shaft 2-3 of the electric drive transmission assembly and the connection unit 3. At this time, the corresponding speed change operation can be completed by operating the speed change button. When the external impact force is greater than the set resistance torque (the resistance force is related to the strength of the reset spring and the depth of the first power connection groove, and can be set according to actual needs) and the external impact amplitude is greater than the set resistance amplitude (the resistance amplitude is equivalent to the depth of the first power connection groove), the anti-collision clutch structure disconnects the power connection between the transmission shaft 2-3 and the connection unit 3. At this time, the connection 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 connection 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.

[0042] 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 bicycle electric drive 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 component and an electric drive transmission assembly; the electric drive transmission assembly is connected between the electric drive component 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 arranged and connected to the connection unit through the anti-collision clutch structure; when the external impact force is greater than the set resistance torque and the external impact amplitude is greater than the set resistance amplitude, the anti-collision clutch structure disconnects the power transmission between the transmission shaft and the connection unit.

2. The bicycle electric drive rear derailleur according to claim 1, characterized in that: The anti-collision clutch structure includes an anti-collision clutch shaft, a docking cylinder, a power connection rod and a return spring; The two ends of the inner cavity of the docking cylinder are respectively provided with a first power connection groove and a second power connection groove; the first power connection groove is provided with two inclined and symmetrically arranged disconnection transmission side surfaces; The power connection rod comprises a first power connection rod and a second power connection rod; The anti-collision clutch shaft is rotatably connected, one end of the anti-collision clutch shaft is fixedly connected to the connection unit, and the other end of the anti-collision clutch shaft extends to one end of the inner cavity of the docking cylinder; one end of the first power connection rod is fixedly connected to the other end of the anti-collision clutch shaft, and in the engaged state, the other end of the first power connection rod extends to the first power connection groove; when the external force drives the anti-collision clutch shaft to rotate, the first power connection rod drives the docking cylinder to move axially through the disconnection transmission side to move away from the anti-collision clutch shaft; One end of the transmission shaft extends to the other end of the inner cavity of the docking cylinder; one end of the second power connection rod is fixedly connected to the end of the transmission shaft extending to the inner cavity of the docking cylinder, and the other end of the second power connection rod extends to the second power connection groove; The return spring is sleeved on the transmission shaft, one end of the return spring presses against the docking cylinder, and the other end of the return spring presses against the fixing part of the transmission shaft.

3. The bicycle electric drive rear derailleur according to claim 2, characterized in that: The axis of the first power connecting rod is perpendicular to the axis of the transmission shaft; the axis of the second power connecting rod is perpendicular to the axis of the transmission shaft.

4. The bicycle electric drive 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.

5. The bicycle electric drive 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.

6. The bicycle electric drive rear derailleur according to claim 1, characterized in that: The connection unit comprises two groups of connecting rods, one group of connecting rods is connected between the electric drive unit and the movable chain guide unit, and the other group of connecting rods is connected between the base unit and the movable chain guide unit.

7. The bicycle electric drive rear derailleur according to claim 6, characterized in that: One of the groups of connecting rods includes two connecting rods, one end of one of the connecting rods is fixedly connected to the anti-collision clutch shaft of the electric drive unit, and the other end of one of the connecting rods is rotatably connected to the movable chain guide unit; one end of the other connecting rod is rotatably connected to the transmission shaft of the electric drive unit, and the other end of the other connecting rod is rotatably connected to the movable chain guide unit.

8. A bicycle, characterized in that: The invention comprises the bicycle electric drive rear derailleur as claimed in any one of claims 1 to 7.

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