CN111846100A - Rear chain shifter of bicycle - Google Patents
Rear chain shifter of bicycle Download PDFInfo
- Publication number
- CN111846100A CN111846100A CN201910359392.3A CN201910359392A CN111846100A CN 111846100 A CN111846100 A CN 111846100A CN 201910359392 A CN201910359392 A CN 201910359392A CN 111846100 A CN111846100 A CN 111846100A
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- China
- Prior art keywords
- spring
- movable member
- disc
- chain guide
- cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
- B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
- B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
- B62M9/121—Rear derailleurs
- B62M9/124—Mechanisms for shifting laterally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
- B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
- B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
- B62M9/121—Rear derailleurs
- B62M9/124—Mechanisms for shifting laterally
- B62M9/1242—Mechanisms for shifting laterally characterised by the linkage mechanisms
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
An embodiment of the present invention provides a bicycle rear derailleur, comprising: a base member adapted to be mounted on a bicycle frame; a movable member movably connected to the base member; a chain guide rotatably connected to the movable member and rotatable relative to the movable member about a rotation axis. The bicycle rear derailleur further comprises: a spring and a disc disposed inside the movable member, one end of the spring being connected to the disc, the other opposite end of the spring being fixedly connected to the chain guide or the movable member. The invention provides a bicycle rear derailleur, which can prevent a chain from loosening and separating from the rear derailleur due to bumpy road when riding on rough terrain.
Description
Technical Field
The present invention relates to the field of bicycle technology, and more particularly, to a bicycle rear derailleur and a bicycle having the same.
Background
A rear derailleur mounted near a rear axle of a bicycle generally includes: the shift lever includes a base member, a movable member movably coupled to the base member via a linkage mechanism, and a chain guide that moves laterally relative to the base member for shifting gears under the action of a control cable on the bicycle shift lever.
The chain guide of the rear derailleur is typically rotatably mounted on the movable member and is spring biased in a clockwise direction to allow the chain guide to adjust the slack of the chain as the chain is adjusted from a larger diameter sprocket to a smaller diameter sprocket.
With the further development of bicycle movement, and particularly with the wider and wider range of mountain bikes, typical rear derailleurs have several disadvantages. During riding over rough terrain, bumps and shocks can cause the chain guide to rotate counterclockwise, creating undesirable slack in the chain, which can cause the chain to disengage from the sprocket, creating an unpredictable risk to the rider. There is room for further improvement in typical rear derailleurs.
Disclosure of Invention
In view of the above, the present invention is directed to a bicycle rear derailleur that does not easily loosen the chain.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme to realize:
a bicycle rear derailleur in accordance with one embodiment of the present invention includes: a base member adapted to be mounted on a bicycle frame; a movable member movably connected to the base member; a chain guide rotatably connected to the movable member and rotatable relative to the movable member about a rotation axis.
The bicycle rear derailleur further comprises: a spring and a disc disposed inside the movable member, one end of the spring being connected to the disc, the other opposite end of the spring being fixedly connected to the chain guide or the movable member;
wherein the spring applies a resistance to rotational movement of the chain guide in a direction; and, the disc is operable to rotate a distance about the axis of rotation, causing the one end of the spring to move relative to the movable member as the disc rotates.
Optionally, the movable member has a first cavity within which the spring and the disc are housed, and the disc is located above the spring;
the disc is provided with end pin holes, one end of the spring is connected with the disc, and the connection of the first end pin of the spring to the end pin holes comprises the installation of the first end pin of the spring to the end pin holes; and a second end leg of the spring opposite the first end leg is fixedly attached to the chain guide.
Optionally, the bicycle rear derailleur further comprises an adjustment worm, the movable member is provided with a mounting hole, and the adjustment worm is rotatably mounted in the mounting hole. Fan-shaped teeth are arranged on the outer circumference of the disc; part of the mounting hole is communicated with the first cavity of the movable component, and part of the fan-shaped teeth are meshed with the teeth of the adjusting worm.
Optionally, one or more notch portions are provided on the disc, and one or more protruding portions matched with the one or more notch portions are provided on the first cavity of the movable member. The one or more convex portions slide a distance relatively within the corresponding notch portion as the disk rotates.
Optionally, the first cavity of the movable member has a cylinder formed therein with a height, the rotating shaft being disposed inside the cylinder. The first cavity and the outer circumference of the cylinder form an annular cavity space, and the spring is arranged in the annular cavity space around the cylinder.
Optionally, the cylinder extends through the spring and the inner ring of the disc, such that the disc is rotatable about the cylinder. The one or more notched portions comprise one or more opposing arcuate notched portions disposed on the inner annular wall of the disk. The one or more raised portions comprise one or two opposing arcuate raised portions disposed on the top wall of the annular cavity space.
Optionally, the engagement of the notched portion with the corresponding first projecting portion is arranged such that one end surface of each notched portion abuts one end surface of the corresponding first projecting portion to determine an initial position of the spring with respect to the movable member.
Optionally, a stop pin is provided on the chain guide, the stop pin defining an initial position of the movable member relative to the chain guide.
Alternatively, a rotation shaft that rotates the chain guide with respect to the movable member is non-rotatably fixed to the link guide plate of the chain guide, the rotation shaft rotates with the chain guide, and the inside of the cylinder penetrates and the top of the rotation shaft engages with the inner circumference of the cylinder.
Optionally, an installation groove is further formed at an inlet of the installation hole, a limit snap spring is installed in the installation groove, and the limit snap spring limits the adjusting worm to rotate around a rotation axis of the adjusting worm, but cannot be displaced along an axial direction of the rotation axis. The mounting hole is provided at an end of the movable member remote from the chain guide.
Optionally, the bicycle rear derailleur further comprises a tension force display device including a movable indicating member, wherein the movable indicating member is coupled to the first end of the spring and moves synchronously with the first end of the spring when the resistance of the spring is adjusted by the adjustment member.
Alternatively, the movable indicating member is connected to the adjusting member and moves in synchronization with the adjusting member when the resistance of the spring is adjusted by the adjusting member.
Optionally, the movable member further has a second cavity located above the first cavity. The tension force display device is installed in the second cavity, a through groove is formed in the bottom of the second cavity, the indicating component is provided with a spring installation hole matched with the first end of the spring, and the first end of the spring extends through the through groove and is installed in the spring installation hole.
Optionally, the tension display device further comprises a display part fixedly installed in the second cavity, the display part is provided with a through hole, and the surface of the display part is provided with indication scales. The indicating part has a tension indicating portion mounted to a through hole of the display part, the indicating part being rotatable when resistance applied by the spring is adjusted by the adjusting member such that the tension indicating portion rotates within the through hole.
Optionally, the display part is provided with one or more first protruding portions, and the movable member is provided with one or more grooves matched with the one or more first protruding portions, so that the display part is fixedly connected in the second cavity of the movable member.
There is also provided, in accordance with another embodiment of the present invention, a bicycle rear derailleur, including: a base member adapted to be mounted on a bicycle frame; a movable member movably connected to the base member; a chain guide rotatably connected to the movable member by a rotating shaft and rotatable relative to the movable member about a rotational axis of the rotating shaft.
The bicycle rear derailleur further comprises: a spring disposed within the first cavity of the movable member about the axis of rotation, the spring having a first end movably mounted within the movable member and a second end opposite the first end, the second end fixedly connected to the chain guide, the spring applying a resistance to rotational movement of the chain guide in a direction; an adjustment member coupled to the first end of the spring and operable to adjust the position of the first end of the spring relative to the movable member to vary the amount of resistance applied by the spring to the chain guide; and a tension display device including a movable indicating member connected to the adjusting member and moving in synchronization with the adjusting member to indicate the resistance applied by the spring to the chain guide.
Optionally, the adjustment member comprises: a disc rotatably disposed within the first cavity of the movable member and above the spring, the disc having a terminal pin bore into which a first terminal pin of the spring is mounted.
Optionally, the bicycle rear derailleur further comprises an adjustment worm, the movable member is provided with a mounting hole, and the adjustment worm is rotatably mounted in the mounting hole. Fan-shaped teeth are arranged on the outer circumference of the disc; part of the mounting hole is communicated with the first cavity of the movable component, and part of the fan-shaped teeth are meshed with the teeth of the adjusting worm.
Optionally, one or more notch portions are provided on the disc, and one or more protruding portions matched with the one or more notch portions are provided on the first cavity of the movable member. The one or more convex portions slide a distance relatively within the corresponding notch portion as the disk rotates.
Optionally, the first cavity of the movable member has a cylinder formed therein with a height, the rotating shaft being disposed inside the cylinder. The first cavity and the outer circumference of the cylinder form an annular cavity space, and the spring is arranged in the annular cavity space around the cylinder.
Optionally, the cylinder extends through the spring and the inner ring of the disc, such that the disc is rotatable about the cylinder. The one or more notched portions comprise one or more opposing arcuate notched portions disposed on the inner annular wall of the disk. The one or more raised portions comprise one or two opposing arcuate raised portions disposed on the top wall of the annular cavity space.
Optionally, the engagement of the notched portion with the corresponding first projecting portion is arranged such that one end surface of each notched portion abuts one end surface of the corresponding first projecting portion to determine an initial position of the spring with respect to the movable member.
Optionally, a stop pin is provided on the chain guide, the stop pin defining an initial position of the movable member relative to the chain guide.
Alternatively, a rotation shaft that rotates the chain guide with respect to the movable member is non-rotatably fixed to the link guide plate of the chain guide, the rotation shaft rotates with the chain guide, and the inside of the cylinder penetrates and the top of the rotation shaft engages with the inner circumference of the cylinder.
Optionally, an installation groove is further formed at an inlet of the installation hole, a limit snap spring is installed in the installation groove, and the limit snap spring limits the adjusting worm to rotate around a rotation axis of the adjusting worm, but cannot be displaced along an axial direction of the rotation axis. The mounting hole is provided at an end of the movable member remote from the chain guide.
Optionally, the bicycle rear derailleur further comprises a tension force display device including a movable indicating member, wherein the movable indicating member is coupled to the first end of the spring and moves synchronously with the first end of the spring when the resistance of the spring is adjusted by the adjustment member.
Alternatively, the movable indicating member is connected to the adjusting member and moves in synchronization with the adjusting member when the resistance of the spring is adjusted by the adjusting member.
Optionally, the movable member further has a second cavity located above the first cavity. The tension force display device is installed in the second cavity, a through groove is formed in the bottom of the second cavity, the indicating component is provided with a spring installation hole matched with the first end of the spring, and the first end of the spring extends through the through groove and is installed in the spring installation hole.
Optionally, the tension display device further comprises a display part fixedly installed in the second cavity, the display part is provided with a through hole, and the surface of the display part is provided with indication scales. The indicating part has a tension indicating portion mounted to a through hole of the display part, the indicating part being rotatable when resistance applied by the spring is adjusted by the adjusting member such that the tension indicating portion rotates within the through hole.
Optionally, the display part is provided with one or more first protruding portions, and the movable member is provided with one or more grooves matched with the one or more first protruding portions, so that the display part is fixedly connected in the second cavity of the movable member.
According to yet another embodiment of the present invention, there is also provided a bicycle including a bicycle frame and the bicycle rear derailleur of the foregoing various embodiments. The bicycle rear derailleur is mounted to the bicycle frame.
The various embodiments of the invention have the following beneficial effects:
the present invention provides a spring within the movable member that applies a torsional force to the chain guide such that rotational movement of the chain guide in one direction (e.g., counterclockwise) continues to be resisted by the spring. Therefore, the invention can prevent the condition that the chain is loosened and separated from the rear derailleur due to the bumpy road when the speed-changing bicycle is ridden on the rugged terrain.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is an exploded view of a chain guide and a movable member according to embodiment 1 of the present invention;
FIG. 2 is a sectional view of the movable member of embodiment 1 of the present invention, taken along the horizontal diameter of the mounting hole;
fig. 3 is a view of the movable member seen from below in embodiment 1 of the present invention;
FIG. 4 is a schematic view of a disk structure of example 1 of the present invention;
FIG. 5 is a structural assembly view of the chain guide and the movable member of embodiment 1 of the invention;
FIG. 6 is an assembly view of the whole structure of embodiment 1 of the present invention;
FIG. 7 is an exploded view of the chain guide and the movable member according to embodiment 2 of the present invention;
fig. 8 is a view of the movable member seen from below in embodiment 2 of the present invention;
fig. 9 is an assembly view of the movable member and the tension indicating device according to embodiment 2 of the present invention;
fig. 10 is an exploded view of a movable member and a tension force display device according to embodiment 2 of the present invention;
FIG. 11 is a schematic view of the tension indicating apparatus of embodiment 2 of the present invention after its removal;
Fig. 12 is a schematic view of a tension display device of embodiment 2 of the present invention.
Reference numerals:
10-a rear derailleur; 20-a base member; 30-a first link member; 40-a second link member; 50-a movable member; 60-a chain guide; 70-a disc; 80-adjusting the worm; 90-limiting clamp springs; 100-a spring; 101-a first terminal pin; 102-a second terminal pin; 50 a-a first cavity; 50 b-a second cavity; 50 c-bottom end face; 50 d-groove; 50 e-through groove; 51-a raised portion; 52-a fixed shaft; 53-set screws; 54-mounting holes; 55-cylinder; 56-mounting grooves; 61-a first chain guide plate; 62-a second chain guide plate; 63-a tension wheel; 64-a guide wheel; 71-end pin holes; 72-sector teeth; 73-a notched portion; 201-a display component; 201 a-display member raised portion; 201 b-a through hole; 202 denotes a component; 202 a-spring mounting hole.
Detailed Description
The invention is further described below with reference to the following examples in conjunction with the accompanying drawings.
Example 1:
FIG. 1 illustrates the linkage relationship between the movable member and the chain guide, and the various components; FIG. 2 illustrates the connection of the adjustment worm to the disc, and the connection of the disc, spring and movable member; FIG. 3 illustrates the structure of the movable member first cavity; FIG. 4 illustrates the configuration of the scallops, end pin holes, and notch portions of the disk; FIG. 5 illustrates the assembled structure of the chain guide and the movable member; FIG. 6 illustrates an overall structure of the rear derailleur.
Referring to fig. 1 and 6, a rear derailleur 10 of a bicycle includes a base member 20 mounted to a frame of the bicycle, a movable member 50 movably coupled to the base member 20, and a chain guide 60, the chain guide 60 being rotatably coupled to the movable member 50 by a rotating shaft. In one embodiment, the rear derailleur 10 further includes a first link member 30 and a second link member 40.
The rear derailleur 10 generally has a four-sided structure with the base member 20, the first link member 30, the second link member 40 and the movable member 50 coupled together by 4 pins, with the movable member 50 being movably coupled to the base member 20 by the first link member 30 and the second link member 40.
The chain guide 60 comprises a first chain guide plate 61, a second chain guide plate 62, a tension pulley 62 and a guide pulley 63, wherein the first chain guide plate 61 and the second chain guide plate 62 are arranged oppositely, and two axial sides of the tension pulley 62 are respectively connected with one end of the first chain guide plate 61 and one end of the second chain guide plate 62; the guide wheel 63 is connected at both axial sides thereof to the other end of the first chain guide plate 61 and the other end of the second chain guide plate 62, respectively
In one embodiment, as shown in fig. 1 and 4, the threaded set screw 53 is non-rotatably secured to the first link plate 61 of the chain guide 60. The movable member 50 is rotatably coupled to the chain guide 60 via a rotation shaft formed by a fixed shaft 52 threadedly engaged with a fixed screw 53. When the rear derailleur 10 with features of the present invention is installed on a bicycle, the chain guide 60 rotates or swings relative to the movable member 50 in the clockwise and counterclockwise directions by the rotational axis of the locked assembly about the fixed axle 52 and the set screw 53, driven by the chain. Thus, the chain guide 60 can rotate about the rotation axis P1 of the rotation shaft 52 with respect to the movable member 50. It will be understood by those skilled in the art that the rotation shaft may be other structure for rotating the chain guide 60 with respect to the movable member 50 than illustrated in the present invention.
As seen in fig. 1 and 2, the inner portion of the movable member 50 of the rear derailleur 10 is provided with a spring 100 and a disc 70, with the disc 70 being disposed above the spring 100. One end of the spring 100 is connected to the disc 70 and the other opposite end of the spring 100 is fixedly connected to the first link plate 61 of the chain guide 60. The spring 100 can apply resistance to the rotation of the chain guide 60 in a certain direction (e.g., counterclockwise direction), preventing the chain guide 60 from rotating, and the chain guide 60 can apply a tension to the chain, so that the chain is not easily dropped. The greater the resistance experienced by the chain guide 60, the greater the tension experienced by the chain.
In other embodiments, the disc 70 may be disposed below the spring 100. One end of the spring 100 is connected to the disc 70 and the other end of the spring 100 is fixedly connected to the inside of the movable member 50. The disc 70 may be movably or fixedly disposed within the movable member 50.
In the embodiment of the present invention, when the disc 70 is movably provided inside the movable member 50, the initial position of one end of the spring 100 connected to the disc 70 with respect to the movable member 50 can be adjusted by exclusively operating the movement of the disc 70 through the operating means, and thus the resistance of the spring 100 to the rotational movement of the chain guide 60 can be increased or decreased. Once adjusted, the disc 70 and spring 100 will be fixed in this position during riding without changing unless the movement of the disc 70 and spring 100 is again operated by the operating member.
With the present embodiment, in the case where the chain guide 60 is rotated counterclockwise due to the bumps and shocks on the road, and the chain wound around the chain guide 60 is loosened or even dropped, the spring 100 can apply resistance to the chain guide 60 by disposing the spring 100 in the movable member 50, so that the chain guide 60 is subjected to resistance in the counterclockwise rotational movement, and the chain guide 60 is not easily rotated counterclockwise, and the chain is not easily loosened or dropped.
According to an embodiment of the present invention, as shown in fig. 1, the movable member 50 has a first cavity 50a, and a rotation shaft composed of a fixing shaft 52 and a fixing screw 53 extends from the chain guide 60 to the first cavity 50 a. The spring 100 is a torsion spring, is received in the first cavity 50a, and is disposed around the rotation axis.
The disc 70 is provided with a leg hole 71, and a first leg 101 of the spring 100 is installed in the leg hole 71 to complete the connection of one end of the spring 100 with the disc 70. While a second end foot 102, opposite the first end foot 101, of the spring 100 is fixedly arranged on the chain guide 60. The connection of the spring 100 to the disc 70, respectively the chain guide 60, can be achieved in other ways, such as welding.
The disc 70 is operable to rotate a distance about the axis of rotation P1 of the pivot shaft and the first end leg 101 of the spring 100 moves relative to the movable member 50 as the disc 70 rotates, thereby varying the resistance exerted by the spring 100 against the chain guide 60.
According to an embodiment of the present invention, the disc 70 may be provided with one or more notched portions or grooves, and the first cavity 50a of the movable member 50 is provided with one or more protruding portions engaged with the one or more notched portions. When the disc 70 is operated to rotate by the operating member, the convex portion can slide relatively within the notched portion corresponding thereto by a certain distance. For example, the notched portions or grooves may be provided on the side or top surface of the disk. In another embodiment, it is also possible that a groove portion is provided in the first cavity of the movable member and a protrusion portion is provided on the disk.
According to an embodiment of the present invention, as shown in fig. 2 to 4, a cylinder 55 having a certain height is formed in the first cavity 50a of the movable member 50, and the rotating shaft 52 is disposed inside the cylinder 55. In an embodiment, the height of the cylinder may be lower than the height of the rotation axis, e.g. half the rotation axis. In another embodiment, the cylinder 55 is internally perforated, and the height of the cylinder may be set to extend from a position near the chain guide to or beyond the height of the rotating shaft such that the top of the rotating shaft is engaged with the inner circumference of the cylinder 55.
The height of the cylinder 55 extends at least through the spring 100 and the inner ring of the disc 70 so that the disc 70 can rotate about the cylinder 55. At this time, an annular chamber space is formed between the first chamber 50a and the outer circumference of the cylinder 55, and the spring 100 is disposed around the cylinder 55 in the annular chamber space. Two opposing arcuate notched portions 73 are provided in the inner annular wall of the disc 70. Two opposite arc-shaped convex parts are arranged on the top wall of the annular cavity space. In the illustration, the number of the notch portions 73 and the projection portions 51 is two, but may be one or more.
The notch portion 73 provided on the disc 70 and the protrusion portion 51 provided at the first cavity 50a of the movable member 50 opposite to the notch portion 73 define an initial position of the disc 70 at the first cavity 50a of the movable member 50 and a rotatable range of the disc 70.
It may be arranged that one end surface of each of the arc-shaped notched portions 73 and one end surface of the corresponding arc-shaped convex portion 51 are fitted together, thereby determining the initial position of the spring 100.
Since the first leg 101 of the spring 100 is mounted on the disc 70, one end surface of the notch portion 73 of the inner hole wall of the disc 70 is tightly fitted with one end surface of the protruding portion of the first cavity 50a of the movable member 50, respectively, under the torsion of the spring, and there is no relative rotation between the disc 70 and the movable member 50, so that the torsion spring 100 can provide a certain torsion force to the chain guide 60. By the arrangement of the notched portion 73 and the projecting portion 51, the rotational limit position of the disc 70 can be defined, thereby defining the maximum resistance of the spring 100 against the chain guide 60 according to this limit position.
According to an embodiment of the present invention, a stopper pin 65 may be provided on the chain guide 60. In assembly, after the movable member 50 is rotated to a predetermined position about the rotational axis, an initial position of the movable member 50 with respect to the chain guide 60 is defined by the stopper pins 65.
As seen in fig. 1 and 2, in one embodiment, the rear derailleur 10 further includes an adjustment worm 80. The disc 70 and the adjustment worm 80 constitute an adjustment mechanism. The movable member 50 is provided with a mounting hole 54. A portion of the mounting hole 54 communicates with the first cavity 50 a. The adjustment worm 80 is rotatably mounted in the mounting hole 54 in the movable member 50. The disk 70 is provided with sector-shaped teeth 72 on the outer circumference thereof, and part of the sector-shaped teeth 72 are engaged with the teeth of the adjusting worm 80.
In one embodiment, a mounting groove 56 is formed at the inlet end of the mounting hole 54, and a limit clamp spring 90 is arranged in the mounting groove 56. Under the action of the limit circlip 90, the adjusting worm 80 can only rotate clockwise and counterclockwise around its own rotation axis P2, and cannot be displaced in the direction of the rotation axis P2.
In general, the resistance provided by the preset spring torsion to the chain guide or the chain tension of the chain can meet the riding requirements of common road conditions. However, when a user rides on a rough road, the chain greatly shakes due to the impact caused by the large fall when the user passes through a large fluctuated and uneven road, and meanwhile, the chain guide piece can rotate around the rotating shaft in the direction of loosening the chain, and the originally preset spring torsion cannot provide enough resistance for the chain guide piece, so that the chain can be loosened, and even fall off from the chain wheel, and the user is accidentally injured.
When a user needs to pass through bad road conditions, the adjusting worm 80 can be rotated clockwise by a tool, the disc 70 is driven to rotate clockwise by the sector-shaped teeth 72 meshed with the adjusting worm, so that one end leg 101 of the torsion spring 100 fixed on the disc 70 is driven to rotate clockwise relative to the movable member 50 from the initial position, and after the disc 70 is rotated to a proper position by the adjusting worm 80, any end face of the annular notch 73 on the inner hole wall of the disc 70 is not contacted with any end face of the convex part 51 inside the movable member 50.
Since the worm gear 80 and the sector gear of the disc 70 are meshed in real time, the meshed worm gear 80 cannot rotate according to the working characteristics of the worm gear, so that the disc 70 is prevented from returning to the initial position under the action of the torsional force of the spring, and the initial position of one end pin of the spring mounted on the disc is correspondingly changed relative to the movable member 50 due to the change of the initial position of the disc 70 relative to the movable member 50.
Thus, depending on the characteristics of the torsion spring, the change in the initial position may increase the spring torsion. The resistance provided to the chain guide after increasing the initial torque force is also correspondingly greater and the corresponding chain guide can provide sufficient chain tension to the chain. Thereby achieving the purpose of preventing the chain from generating unexpected slack condition when riding on rugged ground.
When the user does not require a particularly high chain tension, the adjustment worm 80 is rotated counterclockwise by a tool, causing the disc 70 engaged therewith to rotate counterclockwise, so that the disc 70 is rotated back to the initial position relative to the movable member 50, and the first end leg 101 of the spring 100 is also rotated back to the initial position relative to the movable member 50. Depending on the characteristics of the torsion spring, the resistance provided by the spring to the chain guide during riding use is correspondingly reduced after the initial torsion force is reduced.
The initial position of the spring relative to the movable member 50 as installed can be set such that the spring provides a certain initial torque to the chain guide such that the chain guide 60 is subjected to the initial torque applied by the spring during rotational movement in the opposite direction (e.g., clockwise rotation) to prevent the chain guide from slowing down its rotation without being forced during rotational movement in the opposite direction.
Example 2:
this embodiment adds a tension display device to the previous embodiment, as shown in fig. 7-12. The same or similar parts in this embodiment as in fig. 1-6 are given the same reference numerals.
Referring to fig. 7-12, the rear derailleur 10 includes a base member 20 adapted to be mounted to a bicycle frame, a movable member 50 movably coupled to the base member 20, and a chain guide 60 rotatably coupled to the movable member 50 by a rotating shaft 52 and rotatable relative to the movable member 50 about the axis of the rotating shaft 52.
The movable member 50 has a first cavity 50 a. The elastic member is received in the first cavity 50a of the movable member 50, and includes a first end movably installed in the movable member 50 and a second end opposite to the first end and fixedly connected to the chain guide 60 such that the chain guide 60 is subjected to a resistance force applied by the elastic member when rotationally moved in a certain direction.
The rear derailleur 10 includes an adjustment member. The adjustment member is connected to the first end of the elastic member. The adjustment member is operable to adjust the position of the first end of the resilient member relative to the movable member 50 to vary the amount of resistance the spring exerts against the chain guide 60. In the illustrated embodiment, the resilient member is shown as a torsion spring.
The rear derailleur 10 also includes a tension force display device 200. As shown in fig. 9, 10 and 12, the tension indicating apparatus 200 includes a rotatable indicating member 202, and the rotatable indicating member 202 is connected to a first end of the elastic member and moves in synchronization with the first end of the elastic member when the resistance is adjusted by the adjusting member.
The indicating member 202 is connected to one end of the elastic member or to the adjusting member. When the elastic component moves, the indicating component 202 moves along with the elastic component, and the magnitude or the value of the tension can be indicated. Alternatively, the indicator part (202) moves in synchronization with the adjustment member when the tension of the elastic part (100) is adjusted by the adjustment member. Although the present embodiment shows a rotating indicator member, it is possible that the indicator member moves in other ways to reflect the amount of chain tension.
When different riding environments are met and the tensioning force of the chain needs to be adjusted to obtain the best riding feeling, a rider can clearly know the condition of the tensioning force provided by the spring for the chain according to the indication change of the tensioning force display device 200, and after the proper chain tensioning force is determined, the rider can adjust the tensioning force to the proper size through the adjusting member.
In the various embodiments illustrated herein, the resilient member is shown as a spring 100, however, one skilled in the art will recognize that other resilient members capable of providing resistance to the chain guide are possible. It will be appreciated by those skilled in the art that although the feedback chain tension is considered to be based on the intuitive perspective of the rider, it is also reflected in the spring torsion or resistance applied to the chain guide, and thus may be referred to as a spring torsion or resistance display, and such is within the scope of the claimed invention.
As shown in fig. 7 to 12, the movable member 50 further has a second cavity 50b located above the first cavity 50a, and the tension indicating device 200 is installed in the second cavity 50b, and the first terminal pin 101 of the spring 100 extends through a through slot 50e provided at the bottom of the second cavity 50b and is installed to a spring installation hole 202a of the indicating member 202, which is engaged with the first terminal pin 101.
In one embodiment, the synchronous movement of the indicator member 202 and the first end of the resilient member is achieved by the engagement of the spring mounting hole 202a with the first end leg 101. In another embodiment, the indicating member 202 may be, for example, coupled to the disc 70 to effect synchronous movement of the indicating member 202 and the adjustment member.
According to an embodiment, the tension display device 200 further includes a display part 201 fixedly installed in the second cavity 50b, the display part 201 has a through hole 201b, the through hole 201b is nested by the indication portion of the indication part 202, and the surface of the display part 201 is marked with indication scales. In one embodiment, the indicating scale includes "MIN, MID, MAX" indicia, and the top end surface of the indicating portion of the indicating member 202 is provided with triangular indicating indicia.
According to an embodiment of the present invention, the disc 70 is rotated a certain distance about the rotation axis P1 of the rotation shaft 52 when the tension is adjusted by adjusting the worm 80, and the first end of the spring 100 is moved relative to the movable member 50 according to the rotation of the disc 70.
The movement of the spring 100 or the disc 70 drives the indicating member 202 to rotate around the rotation axis P1, and the indicating portion thereof rotates inside the through hole 201b to point to different indicating scales when rotating to different angles, which indicates different magnitudes of the tension at the same time.
To connect the disc 70 to the rotatable indicator member 202 of the chain tension indicating device 200, a through slot 50e, shown as an arc-shaped slot, is provided in the bottom end surface 50c of the second chamber 50b of the movable member 50, and one of the end legs 101 of the spring 100 connected to the disc 70 is elongated such that, after being mounted inside the movable member 50, the elongated portion passes through the end leg hole 70a of the disc and the through slot 50e and is higher than the bottom end surface 50c of the second chamber 50b of the movable member 50. The indication component 202a is provided with a spring mounting hole 202a, and the end pin 101 of the spring 100 is mounted in the spring mounting hole 202a after passing through the through slot 50 e.
According to an embodiment of the present invention, the display part 200 is provided with one or more display part protruding portions 201a, the movable member 50 is provided with one or more grooves 50d engaged with the display part protruding portions 201a, and the tension display part 200 is fixed in the second cavity 50b of the movable member 50 by the engagement of the display part protruding portions 201a and the grooves 50 d. In one embodiment, two display member convex portions 201a and two grooves 50d are provided.
How to adjust the chain tension is described in detail in embodiment 1, and is not described in detail in this embodiment.
The resistance force applied by the spring to the chain guide is adjusted by the adjustment member. This is reflected in chain tension on the chain mounted to the chain guide. The rider need not be concerned with the internal structure of the bicycle rear derailleur due to the intuitive and convenient perspective based on the user. Thus, by providing a chain tension display on the bicycle rear derailleur, the user only needs to focus on the amount of chain tension, albeit in essence the resistance applied by the spring to the chain guide and thus the tension provided to the chain. The tension display device enables a rider to intuitively know the tension degree of the chain, and adjusts the tension of the chain through the adjusting member according to different riding environments to achieve the best riding feeling.
When the rider adjusts the worm gear 80 engaged with the disc 70 clockwise or counterclockwise, the indicating member 202 rotates synchronously with the disc 70, and since the display member 201 is fixed to the movable member 50, the rider can determine the required chain tension based on the position of the triangular mark on the end surface of the indicating member 201 corresponding to the corresponding chain tension level (MIN, MID, MAX) on the display member.
While various embodiments which incorporate the features of the present invention have been described in detail above, other modifications may be employed without departing from the spirit and scope of the invention. For example, the size, shape, or location of the various components may be changed. The functions of one element may be performed by two, and vice versa. It will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the detailed description of the embodiments of the present disclosure is to be construed as merely illustrative, and not limitative of the remainder of the disclosure, but rather to limit the scope of the disclosure to the full extent set forth in the appended claims.
Claims (10)
1. A bicycle rear derailleur, comprising: a base member (20) adapted to be mounted on a bicycle frame; a movable member (50) movably connected to the base member (20); a chain guide (60), said chain guide (60) being rotatably connected to said movable member (50) and being rotatable relative to said movable member (50) about a rotation axis (P1); characterized in that, the bicycle rear derailleur still includes:
a spring (100) and a disc (70) disposed inside the movable member (50), one end of the spring (100) being connected to the disc (70), the other opposite end of the spring (100) being fixedly connected to the chain guide (60) or the movable member (50);
Wherein the spring (100) applies a resistance to rotational movement of the chain guide (60) in a direction; and the number of the first and second groups,
the disc (70) is operable to rotate a distance about the axis of rotation (P1) to cause the one end of the spring (100) to move relative to the movable member (50) as the disc (70) rotates.
2. The bicycle rear derailleur according to claim 1, wherein:
the movable member (50) having a first cavity (50a), the spring (100) and the disc (70) being housed within the first cavity (50a), and the disc (70) being located above the spring (100);
the disc (70) is provided with a terminal pin hole (71), one end of the spring (100) is connected with the disc (70) and a first terminal pin (101) of the spring (100) is installed in the terminal pin hole (71); and the number of the first and second groups,
a second end leg (102) of the spring (100) opposite the first end leg (101) is fixedly connected to the chain guide (60).
3. A bicycle rear derailleur, comprising: a base member (20) adapted to be mounted on a bicycle frame; a movable member (50) movably connected to the base member (20); a chain guide (60) rotatably connected to the movable member (50) by a rotating shaft, and rotatable relative to the movable member (50) about a rotational axis (P1) of the rotating shaft; characterized in that, the bicycle rear derailleur still includes:
A spring (100) disposed within a first cavity of the movable member (50) about the axis of rotation, the spring (100) having a first end movably mounted within the movable member (50) and a second end opposite the first end fixedly connected to the chain guide (60), the spring (100) applying resistance to rotational movement of the chain guide (60) in a direction;
an adjustment member coupled to a first end of the spring (100) and operable to adjust a position of the first end of the spring (100) relative to the movable member (50) to vary an amount of resistance applied by the spring (100) to the chain guide (60); and the number of the first and second groups,
a tension display device (200) comprising a movable indicator member (202), said indicator member (202) being connected to said adjustment member and moving synchronously with said adjustment member to indicate the tension applied by said spring (100) to a chain mounted on said chain guide (60).
4. The bicycle rear derailleur according to claim 3, wherein said adjustment member includes: a disc (70), the disc (70) being rotatably disposed within the first cavity (50a) of the movable member (50) and above the spring (100), the disc (70) being provided with a terminal pin hole (71), a first terminal pin (101) of the spring (100) being fitted into the terminal pin hole (71).
5. The bicycle rear derailleur according to claim 1 or 4, further comprising an adjustment worm (80), wherein said movable member (50) is provided with a mounting hole (54), and wherein said adjustment worm is rotatably mounted in said mounting hole (54);
fan-shaped teeth (72) are arranged on the outer circumference of the disc (70);
part of the mounting hole (54) communicates with the first cavity (50a) of the movable member (50), and part of the sector-shaped teeth (72) meshes with the teeth of the adjustment worm (80).
6. The bicycle rear derailleur according to any one of claims 1, 4 or 5, wherein the disc (70) is provided with one or more notched portions (73), and the first cavity (50a) of the movable member (50) is provided with one or more first protruding portions (51) that mate with the one or more notched portions (73);
wherein the one or more first raised portions (51) slide a distance relative within the respective notch portion (73) as the disc (70) rotates.
7. The bicycle rear derailleur according to claim 1, wherein: the bicycle rear derailleur further comprises a tension force display device (200) including a movable indicating member (202), wherein the movable indicating member (202) is coupled to the first end of the spring (100) and moves synchronously with the first end of the spring (100) when the resistance applied by the spring is adjusted by the adjustment member; alternatively, the movable indicating member (202) is connected to the adjustment member and moves in synchronism with the adjustment member when the resistance exerted by the spring (100) is adjusted by the adjustment member.
8. The bicycle rear derailleur according to claim 7 or 3, wherein;
the movable member (50) further having a second cavity (50b) located above the first cavity (50 a);
the tension force display device (200) is installed in the second cavity (50b), a through groove (50e) is formed in the bottom of the second cavity (50b), the indicating component (202) is provided with a spring installation hole (202a) matched with the first end of the spring (100), and the first end of the spring (100) extends through the through groove (50e) and is installed in the spring installation hole (202 a).
9. The bicycle rear derailleur according to claim 8, wherein said tension force display device (200) further includes a display member (201) fixedly mounted in said second cavity (50b), said display member having a through hole (201b), and a surface of said display member (201) being provided with indication scales; and the number of the first and second groups,
the indicating part (202) has a tension indicating portion mounted to a through hole (201b) of the display part (201), and the indicating part (202) is rotatable so that the tension indicating portion rotates in the through hole (201b) when the resistance force applied by the spring (100) is adjusted by the adjusting member.
10. A bicycle comprising a bicycle frame and a bicycle rear derailleur as claimed in any one of claims 1 to 9 mounted on the bicycle frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910359392.3A CN111846100B (en) | 2019-04-30 | 2019-04-30 | Rear chain shifter of bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910359392.3A CN111846100B (en) | 2019-04-30 | 2019-04-30 | Rear chain shifter of bicycle |
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| CN111846100A true CN111846100A (en) | 2020-10-30 |
| CN111846100B CN111846100B (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910359392.3A Active CN111846100B (en) | 2019-04-30 | 2019-04-30 | Rear chain shifter of bicycle |
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Cited By (1)
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|---|---|---|---|---|
| TWI801249B (en) * | 2022-05-27 | 2023-05-01 | 台灣微轉股份有限公司 | Rear derailleur |
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| CN111846100B (en) | 2022-08-16 |
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