CN220281597U - Electric derailleur - Google Patents

Abstract

The application provides an electric derailleur, which comprises a fixed base, a driving device, a chain guide assembly and a connecting rod, wherein the chain guide assembly is configured to be movable relative to the fixed base, and two ends of the connecting rod are respectively and pivotally connected with the chain guide assembly and the fixed base; the driving device is configured on the connecting rod, and comprises a transmission shaft which is pivotally connected with the connecting rod and the chain guide assembly, and the transmission shaft is configured to drive the chain guide assembly and the connecting rod to move relative to the fixed base through applying force to the chain guide assembly. The electric derailleur provided by the application can improve the power transmission performance.

Description

Electric derailleur

Technical Field

The application relates to the technical field of bicycles, in particular to an electric derailleur.

Background

The derailleur is an important part of a speed-changing bicycle for shifting a chain over different sized sheaves to achieve a speed change. Existing derailleurs have a manual derailleur that is pulled by a wire rope and an electric derailleur that is driven by a motor. Existing electric derailleurs typically include a motor assembly, a linkage and a chain guide, the linkage and chain guide being pivotally connected, the chain passing through the chain guide, the motor assembly applying power to drive the chain guide to move, thereby shifting the chain to switch on different sheaves; the chain guide piece can be driven to move in opposite directions by forward and reverse rotation output by the motor assembly, so that the chain can be switched back and forth between different wheel discs. The Chinese patent application publication No. CN103707996A discloses an electric bicycle rear derailleur. However, in this prior art, the motor, that is, the motor unit is disposed on the base member, and the output end of the motor drives the movable member to move through the link, and thus drives the chain guide to move, so that the power transmission path is long, and the power transmission performance is not ideal.

In view of this, there is a need to propose a new solution to overcome the problems of the prior art.

Disclosure of Invention

The present application provides an electric derailleur that can improve power transmission performance.

In order to achieve the above purpose, the present application adopts the following technical scheme: an electric derailleur comprises a fixed base, a driving device, a chain guide assembly and a connecting rod, wherein the chain guide assembly is movably arranged relative to the fixed base, and two ends of the connecting rod are respectively and pivotally connected with the chain guide assembly and the fixed base; the driving device is configured on the connecting rod, and comprises a transmission shaft which is pivotally connected with the connecting rod and the chain guide assembly, and the transmission shaft is configured to drive the chain guide assembly and the connecting rod to move relative to the fixed base through applying force to the chain guide assembly.

As a further improved technical solution of the present application, the driving device comprises a motor, the motor is provided with an output end connected with the transmission shaft in a transmission way, and the output end is positioned at one end of the connecting rod, which faces the guide chain assembly.

As a further improved technical solution of the present application, the chain guide assembly comprises a movable member and a chain guide member, the movable member is pivotally connected with the connecting rod through the transmission shaft, and the chain guide member is rotatably connected with the movable member.

As a further improved technical solution of the present application, the link includes an upper link and a lower link pivotally connected to the fixed base and the movable member, respectively, the upper link and the lower link being moved in response to movement of the movable member relative to the fixed base.

As a further improved technical scheme of the application, the transmission shaft is provided with a buffer piece elastically abutted with the movable piece, and the transmission shaft drives the movable piece to rotate at least in one rotation direction through the buffer piece.

As a further improved technical solution of the present application, a biasing member is configured between the upper link and the fixed base, and the biasing member is configured to: the upper link is provided with a biasing force facilitating movement of the upper link in one rotational direction of the upper link relative to the fixed base.

As a further improved technical scheme of the present application, the biasing member is a torsion spring, one end of the torsion spring abuts against the upper connecting rod, and the other end abuts against the fixed base.

According to the technical scheme, the transmission shaft is provided with the stirring piece which is fixed relative to the transmission shaft in the circumferential direction, a load limiting device is arranged between the stirring piece and the guide chain assembly, and the load limiting device is configured to separate transmission connection between the stirring piece and the guide chain assembly when the load born by the guide chain assembly exceeds a load threshold.

As a further improved technical solution of the present application, the load limiting device includes a protruding member that connects the stirring member and the chain guide assembly at the same time, and the protruding member is configured to be capable of transmitting power to the chain guide assembly in a rotation direction of the stirring member.

As a further improved technical scheme of the application, the protruding piece is a ball, and the poking piece is provided with a hemispherical groove for accommodating a part of the ball.

As a further improved technical solution of the present application, the load limiting device includes an elastic member elastically abutting against the ball toward the toggle member.

As a further improved technical scheme of the application, the battery module for providing power for the driving device is detachably attached to the fixed base, and the electric derailleur further comprises a wireless communicator, wherein the wireless communicator is configured in the battery module.

The electric derailleur provided by the application is characterized in that a driving device is arranged on a connecting rod, a transmission shaft of the driving device is pivotally connected to the connecting rod and a chain guide assembly, and driving force provided by rotation of the transmission shaft is applied to the chain guide assembly so as to drive the chain guide assembly and the connecting rod to move relative to a fixed base; therefore, the power of the driving device is not transmitted to the guide chain assembly through the connecting rod, but is directly applied to the guide chain assembly, so that the power transmission path can be shortened, and the power transmission performance can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present application and are not limiting of the present application.

FIG. 1 is a perspective view of an electric derailleur of the present application.

FIG. 2 is an exploded perspective view of the electric derailleur of the present application.

FIG. 3 is a perspective view of the lower link and the drive device of the electric derailleur of the present application.

FIG. 4 is a perspective view of the electric derailleur of the present application with the chain guide removed.

FIG. 5 is an exploded perspective view of the electric derailleur of the present application with the chain guide removed.

FIG. 6 is an exploded perspective view of the electric derailleur of the present application from another perspective with the chain guide removed.

FIG. 7 is a perspective view of the lower link, the drive unit and the movable member of the electric derailleur of the present application.

Reference numerals illustrate: a 100-derailleur; 1-a fixed base; 11-a first rotating shaft; 12-a second rotating shaft; 13-a third rotating shaft; 14-a mounting part; 2-upper connecting rod; 3-a lower link; 31-an inner shell; 32-a middle frame; 33-a housing; 34-gear cover; 4-a movable member; 41-mounting slots; 42-a load limiting device; 421-balls; 422-elastic member; 5-a driving device; 51-a motor; 52-gear set; 53-screw; 54-worm gear; 55-transmission shafts; 551-toggle; 5510-hemispherical grooves; 552-a buffer; 6-a chain guide; 7-a battery module; 8-biasing member.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Unless defined otherwise, technical or scientific terms used in this patent document should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object being described changes, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the apparatus or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.

Referring to FIGS. 1-7, an electric derailleur 100 is provided for shifting a chain to shift on different sized sheaves to achieve a shift. The derailleur 100 includes a fixed base 1, a driving device 5, a link, a chain guide assembly, and a battery module 7. The links include an upper link 2 and a lower link 3. The chain guide assembly includes a movable member 4 and a chain guide 6.

Referring to fig. 1 and 2, the fixed base 1 is used as a base body to which the upper link 2, the lower link 3, the movable member 4, the driving device 5, the chain guide assembly and the battery module 7 are directly or indirectly mounted. While the fixed base 1 is configured and adapted to be mounted to a frame of a bicycle such that the derailleur 100 is mounted to the frame of the bicycle via the fixed base 1. In this embodiment, the fixing base 1 is provided with a mounting portion 14, the fixing base 1 and the entire derailleur 100 are connected to the frame of the bicycle through the mounting portion 14, and the mounting portion 14 may be a screw, a buckle, a strap, etc., which is sufficient to connect the fixing base 1 to the frame of the bicycle.

The movable member 4 is configured to be movable relative to the fixed base 1, and the chain guide 6 is rotatably coupled to the movable member 4. The chain guide 6 is configured to be movable with respect to the fixed base 1, the chain guide 6 including two side plates arranged substantially in parallel and a guide sprocket connected between the two side plates. The chain of the bicycle is arranged in the two side plates of the chain guide 6 in a penetrating way and wound on the chain guide wheel. When a gear shift and a speed change are needed, the chain guide 6 can be driven to move, so that the chain guide 6 pushes the chain to move, the chain is switched on the wheel discs with different sizes, the speed change is realized, and meanwhile, the tensioning of the chain can be realized through the guide chain wheels.

Referring to fig. 4, two ends of the connecting rod are pivotally connected to the movable member 4 and the fixed base 1, that is, two ends of the upper connecting rod 2 and the lower connecting rod 3 are pivotally connected to the fixed base 1 and the movable member 4, and the fixed base 1, the upper connecting rod 2, the lower connecting rod 3 and the movable member 4 form a four-bar mechanism. In this embodiment, the upper link 2 is substantially a plate body and is located at a position above the lower link 3. One end of the upper connecting rod 2 is pivotally connected to the fixed base 1 through a second rotating shaft 12, and the other end is pivotally connected to the movable member 4 through a third rotating shaft 13. The lower link 3 is configured as a mounting seat for mounting the driving device 5, one end of the lower link 3 is pivotally connected to the fixed base 1 through the first rotating shaft 11, and the other end is pivotally connected to the movable member 4 through a transmission shaft 55 of the driving device 5. Referring to fig. 3, specifically, the lower link 3 includes an inner shell 31, a middle frame 32, an outer shell 33, and a gear cover 34. The inner shell 31 is internally provided with a space for installing the driving device 5, the middle frame 32 is fixed on the inner shell 31, one end part of the middle frame 32 is pivoted on the fixed base 1, the outer shell 33 is covered on the inner shell 31 and the middle frame 32 and used for covering the driving device 5, and the gear cover 34 is covered on the gear set 52 of the driving device 5 to play a role of protecting the gear set 52.

As shown in fig. 2 and 3, the driving device 5 is disposed on the link, specifically, the driving device 5 is disposed on the lower link 3. The driving device 5 comprises a motor 51, a gear set 52 driven by the output end of the motor 51 to move, a screw 53 driven by the gear set 52 to rotate, a worm wheel 54 in meshed transmission connection with the screw 53, a transmission shaft 55 driven by the worm wheel 54 to rotate and a poking piece 551 sleeved on the transmission shaft 55. The transmission shaft 55 is configured to drive the movable member 4 and the link to move relative to the fixed base 1, and the transmission shaft 55 is pivotally connected to the lower link 3 and the movable member 4. The stirring piece 551 and the transmission shaft 55 are relatively and fixedly arranged in the circumferential direction of the transmission shaft 55, that is, the transmission shaft 55 drives the stirring piece 551 to synchronously rotate. The stirring piece 551 is driven to rotate by the transmission shaft 55, and drives the movable piece 4 and the connecting rod to move by applying force to the movable piece 4. The output end of the motor 51 is in driving connection with the transmission shaft 55, and the output end is positioned at one end of the lower connecting rod 3 facing the movable member 4. The output end of the motor 51 is arranged towards the movable part 4, so that the connection with the transmission shaft 55 can be facilitated, and meanwhile, compared with the position where the lower connecting rod 3 is connected with the fixed base 1, the position where the lower connecting rod 3 is connected with the movable part 4 has a larger operable space, and the installation of components such as the gear set 52, the screw 53, the worm wheel 54 and the like is facilitated. When the device works, the motor 51 is started, the transmission shaft 55 is driven to rotate through the gear set 52, the screw 53 and the worm wheel 54, the transmission shaft 55 rotates to drive the stirring piece 551 to rotate, the stirring piece 551 pushes the movable piece 4 to move relative to the fixed base 1, and the upper connecting rod 2 and the lower connecting rod 3 rotate around the second rotating shaft 12 and the first rotating shaft 11 in response to the movement of the movable piece 4 relative to the fixed base 1.

The driving device 5 is arranged on the lower connecting rod 3, a transmission shaft 55 included in the driving device 5 is pivotally connected to the lower connecting rod 3 and the movable piece 4, and a toggle piece 551 driven by the transmission shaft 55 is applied to the movable piece 4 to drive the movable piece 4 and the connecting rod to move; the power of the driving device 5 is directly applied to the movable member 4 instead of being transmitted to the movable member 4 through the connecting rod, so that the power transmission path can be shortened, and the power transmission performance can be improved.

Referring to fig. 5 to 7, a load limiting device 42 is disposed between the toggle member 551 and the movable member 4, and the position where the lower link 3 is connected to the movable member 4 has a larger operable space than the position where the lower link 3 is connected to the fixed base 1, so that the load limiting device 42 can be conveniently disposed. The load limiting device 42 is configured to disengage the transmission connection between the toggle member 551 and the movable member 4 when the load carried by the movable member 4 exceeds a load threshold. Specifically, the load limiting device 42 includes a protruding member that connects the stirring member 551 and the movable member 4 at the same time, and an elastic member 422 that elastically abuts against the protruding member toward the stirring member 551. The protruding member is configured to be able to transmit power to the movable member 4 in the rotation direction of the toggle member 551. In this embodiment, the protruding member is a ball 421, and the striking member 551 is provided with a hemispherical groove 5510 for accommodating a portion of the ball 421. That is, approximately half of the balls 421 are accommodated in the stirring member 551, and approximately the other half of the balls 421 are accommodated in the moving member 4, and when the stirring member 551 rotates, the balls 421 can apply force to the moving member 4 to urge the moving member 4 to move. The elastic member 422 elastically pushes against the ball 421 toward the striking member 551, so that the ball 421 is kept accommodated in the hemispherical groove 5510 of the striking member 551 when the load on the movable member 4 does not exceed the load threshold; when the load on the movable member 4 exceeds the load threshold, the balls 421 compress the elastic member 422 to elastically deform, and the balls 421 are separated from the hemispherical grooves 5510, so that the driving connection between the toggle member 551 and the movable member 4 through the balls 421 is separated. The load threshold can be adjusted by changing the elasticity of the elastic member 422 or the matching depth of the ball 421 and the hemispherical groove 5510, and the size of the load threshold can be preset in factory production according to actual needs.

Further, a buffer member 552 elastically abutting against the movable member 4 is disposed on the transmission shaft 55, and the transmission shaft 55 rotates at least in one rotation direction by pulling the movable member 4 through the buffer member 552. Specifically, the buffer member 552 is disposed between the stirring member 551 and the movable member 4, and the stirring member 551 stirs the movable member 4 to rotate through the buffer member 552 in at least one movement direction. The buffer member 552 is a torsion spring, the torsion spring is sleeved on the transmission shaft 55, one end of the torsion spring abuts against the stirring member 551, and the other end abuts against the movable member 4. The buffer member 552 is in a torsion compression state and is arranged between the stirring member 551 and the movable member 4, and the buffer member 552 can play a role in buffering between the stirring member 551 and the movable member 4, so that impact caused by hard contact is avoided, and the action of the derailleur 100 and the service life are influenced.

Referring again to fig. 2, a biasing member 8 is disposed between the upper link 2 and the fixed base 1, and the biasing member 8 is configured to: in one rotational direction of the upper link 2 with respect to the fixed base 1, a biasing force facilitating movement of the upper link 2 is provided to the upper link 2. In this embodiment, the biasing member 8 is a torsion spring, and one end of the torsion spring abuts against the upper link 2, and the other end abuts against the fixed base 1. When the upper connecting rod 2, the movable piece 4 and the chain guide 6 move in one direction, for example, the chain is driven to move from the small wheel disc to the large wheel disc or the chain is driven to move from the large wheel disc to the small wheel disc, the biasing member 8 is compressed to store force; when the upper link 2 moves in the opposite direction to the movable member 4 and the chain guide 6, the compressed biasing member 8 releases the elastic force, thereby facilitating the derailleur action.

Referring to fig. 1 and 2, a battery module 7 for supplying power to the driving device 5 is detachably attached to the fixed base 1. The battery module 7 is arranged as a relatively independent module, and can be conveniently disassembled for maintenance, inspection, replacement and other operations. Wherein the removable attachment includes, but is not limited to, by snap connection, by screw connection, magnetically attracted connection, and the like. In one embodiment, the motorized derailleur 100 is coupled to a user's operating device in a wireless communication, such as a wireless communication with a user's thumb device for operating the derailleur 100, and the motorized derailleur 100 includes a wireless communicator that receives a wireless signal from the thumb device to send a derailleur command to activate the driving device 5 to operate to effect a derailleur. In this embodiment, the wireless communicator is disposed in the battery module 7, so that the wireless communicator is closer to the outside, which is beneficial to receiving and transmitting wireless signals, and is more sensitive to control. In one embodiment, the derailleur 100 is a rear bicycle derailleur.

As can be seen from the above description of the specific embodiments, the electric derailleur 100 provided in the present application has the driving device 5 disposed on the connecting rod, the driving device 5 includes a driving shaft 55 pivotally connected to the connecting rod and the movable member 4, and the toggle member 551 driven by the driving shaft 55 drives the movable member 4 and the connecting rod to move by exerting a force on the movable member 4; the power of the driving device 5 is directly applied to the movable member 4 instead of being transmitted to the movable member 4 through the connecting rod, so that the power transmission path can be shortened, and the power transmission performance can be improved.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (12)

1. An electric derailleur comprises a fixed base, a driving device, a chain guide assembly and a connecting rod, wherein the chain guide assembly is movably arranged relative to the fixed base, and two ends of the connecting rod are respectively and pivotally connected with the chain guide assembly and the fixed base; the driving device is arranged on the connecting rod, and comprises a transmission shaft which is pivotally connected with the connecting rod and the chain guide assembly, and the transmission shaft is arranged to drive the chain guide assembly and the connecting rod to move relative to the fixed base by applying force to the chain guide assembly.

2. The motorized derailleur of claim 1, wherein the drive arrangement includes a motor having an output drivingly connected to the drive shaft, the output being located at an end of the linkage toward the chain guide assembly.

3. The electric derailleur of claim 2, wherein the chain guide assembly includes a movable member pivotally coupled to the connecting rod by the drive shaft and a chain guide rotatably coupled to the movable member.

4. The electric derailleur of claim 3, wherein the linkage includes an upper linkage and a lower linkage pivotally coupled to the fixed base and the movable member, respectively, the upper and lower linkages moving in response to movement of the movable member relative to the fixed base.

5. The motorized derailleur of claim 4, wherein the drive shaft is provided with a buffer member in resilient abutment with the movable member, and the drive shaft rotates the movable member via the buffer member in at least one rotational direction.

6. The electric derailleur of claim 4, wherein a biasing member is disposed between the upper link and the fixed base, the biasing member being configured to: the upper link is provided with a biasing force facilitating movement of the upper link in one rotational direction of the upper link relative to the fixed base.

7. The electric derailleur of claim 6, wherein the biasing member is a torsion spring with one end abutting the upper link and the other end abutting the fixed base.

8. The motorized derailleur of claim 1, wherein the drive shaft is provided with a toggle member that is circumferentially fixed relative to the drive shaft, and wherein a load limiting device is disposed between the toggle member and the chain guide assembly, the load limiting device being configured to disengage the drive connection between the toggle member and the chain guide assembly when the chain guide assembly is subjected to a load exceeding a load threshold.

9. The motorized derailleur of claim 8, wherein the load limiting device includes a protrusion that connects the toggle member and the chain guide assembly at the same time, the protrusion being configured to transmit power to the chain guide assembly in a rotational direction of the toggle member.

10. The motorized derailleur of claim 9, wherein the protruding member is a ball, and wherein the toggle member is provided with a hemispherical recess for receiving a portion of the ball.

11. The motorized derailleur of claim 10, wherein the load limiting device includes an elastic member that elastically abuts the ball bearing toward the toggle member.

12. The motorized derailleur of claim 1, wherein the stationary base has a battery module removably attached thereto that provides power to the driving device, and further comprising a wireless communicator disposed in the battery module.