A rear-mounted precision speed shifting device based on wire transmission

Abstract

The present invention provides a rear-mounted precision speed shifting device based on linear transmission, characterized in that the device comprises a finger shifter installed on a bicycle handlebar, a shifting mechanism installed on a rear wheel of the bicycle, and a steel wire rope connected to the finger shifter at one end and to the shifting mechanism at the other end, wherein the shifting mechanism comprises a gear shifter connected to the steel wire rope and a transmission connected to the gear shifter; when a user shifts the finger shifter, the steel wire rope drives the gear shifter on the rear wheel, thereby driving the transmission connected to the gear shifter to shift gears, shortening the steel wire rope transmission distance between the gear shifter and the shifting mechanism, thereby avoiding precision errors caused by friction in the linear transmission process of the gear shifter, and having a greater fault tolerance value for the input of the gear shifter without modifying the gear shifting accuracy.

Description

[Technical field]

[0001] The invention relates to the technical field of bicycles, and in particular to a rear-mounted precise speed change gear shifting device based on wire transmission. [Background technology]

[0002] Bicycles with gear adjustment are a common means of transportation for people. By adjusting the gear of the bicycle, the purpose of shifting gears and changing speeds can be achieved. The existing bicycle gear shifter is usually set near the handlebars of the bicycle. The user uses his fingers to turn the gear shifter to make the shift mechanism located at the rear wheel and connected to the gear shifter through a wire rope to achieve gear shifting and changing speeds. The traditional gear shifter is a multi-stage speed adjustment. When the user turns the gear shifter, he can feel obvious jamming, so that he can know how many gears he has adjusted without visual judgment. However, during the transmission process of the wire rope, the gear shifter will produce precision errors due to friction, which often causes the user to clearly dial up 2 gears, but the gear shift mechanism actually only adjusts up 1 gear. Therefore, it is necessary to provide a precise speed shifting device that avoids the precision error of the gear shifter due to friction during the linear transmission process, and has a greater fault tolerance value for the input of the gear shifter without modifying the gear adjustment accuracy. [Summary of the invention]

[0003] The object of the present invention is to provide a rear-mounted precision speed change gear shifting device based on wire transmission.

[0004] The technical solution of the present invention is as follows: a rear-mounted precision speed shifting device based on wire transmission, the device includes a finger shifter installed on the handlebars of a bicycle, a shifting mechanism installed on the rear wheel of the bicycle, and a steel wire rope connected to the finger shifter at one end and to the shifting mechanism at the other end, the shifting mechanism includes a gear shifter connected to the steel wire rope, and a transmission connected to the gear shifter, when the user shifts the finger shifter, the steel wire rope drives the gear shifter located on the rear wheel, thereby driving the transmission connected to the gear shifter to shift gears.

[0005] More preferably, the gear shifter includes a gear shifter housing, an active seat connected to the wire rope, a driven seat arranged opposite to the active seat and connected to the transmission, a traction rope connecting the driven seat and the transmission, an axis connecting the active seat and the driven seat, a speed regulating ratchet having end ratchet teeth and side ratchet teeth and arranged between the active seat and the driven seat, a first pawl arranged near the active seat and cooperating with the end ratchet teeth of the speed regulating ratchet, and a second pawl arranged near the driven seat and cooperating with the side ratchet teeth of the speed regulating ratchet.

[0006] More preferably, the end face ratchet teeth of the speed regulating ratchet wheel extend in a direction close to the active seat, and the side face ratchet teeth of the speed regulating ratchet wheel extend in a direction away from the axis center, the first pawl includes a first meshing portion matched with the end face ratchet teeth, a first impact portion connected to the first meshing portion and extending in a direction close to the driven seat, a first rotating portion connected to the first impact portion and rotatably connected to the axis center along an axial direction perpendicular to the axis center, the second pawl includes a second meshing portion matched with the side face ratchet teeth, a second impact portion connected to the second meshing portion and extending in a direction away from the driven seat, a first rotating portion connected to the second impact portion and fixedly connected to the gear shifter housing, and A second rotating part rotatably connected to the gear shifter housing along an axial direction parallel to the axis, and a buffer part opposite to each other and with an inclined surface fitting therewith is respectively provided at one end of the first impact part close to the driven seat and one end of the second impact part close to the active seat. When the user moves the finger shifter, the first impact part rotates following the axis and collides with the second impact part. When the first impact part collides with the inclined surface side of the buffer part of the second impact part relative to each other, the first impact part rotates around the first rotating part to separate the first meshing part from the end face ratchet; when the first impact part collides with the buffer part of the second impact part away from the inclined surface side in the opposite direction, the second impact part rotates around the second rotating part to separate the second meshing part from the side face ratchet.

[0007] More preferably, the axis of the gear selector includes an axis seat connected to the active seat at one end and connected to the driven seat at the other end, a bearing arranged between the active seat and the speed regulating ratchet, a first torsion spring arranged between the bearing and the speed regulating ratchet, a second torsion spring arranged at the end of the driven seat away from the active seat, an upper end cover arranged at the end of the active seat away from the driven seat, and a lower end cover arranged at the end of the driven seat away from the active seat.

[0008] More preferably, the transmission includes a first fixed portion fixed to the gear shifter, a first swing arm rotatably connected to the first fixed portion, a second swing arm rotatably connected to the first fixed portion and arranged opposite to the first swing arm, a second fixed portion rotatably connected to the first swing arm and the second swing arm respectively, a guide wheel fixing portion fixedly connected to the second fixed portion, and a guide wheel connected to the guide wheel fixing portion.

[0009] More preferably, a guide wheel is provided on the second swing arm, and the traction rope is fixed to the first swing arm after being wound around the guide wheel.

[0010] More preferably, the finger shifter includes a finger shifter, a winder for gathering the steel wire rope, and a fixing seat connecting the winder and the bicycle handlebar, and the finger shifter is connected to the steel wire rope.

[0011] Preferably, the device further comprises a wire rope protective sleeve, one end of which is connected to the winder, and the other end of which is fixed to the first fixing portion.

[0012] The beneficial effect of the present invention is that the present invention shortens the wire rope transmission distance between the gear selector and the gear shift mechanism by placing the gear selector at the rear end, thereby avoiding the precision error of the gear selector due to friction during the linear transmission process, and has a greater fault tolerance value for the input of the gear selector without modifying the gear shift accuracy.

Brief Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the device of the present invention;

[0014] Figure 2 It is an exploded view of the device structure of the present invention;

[0015] Figure 3 It is a schematic diagram of the three-dimensional structure of the gear shifter of the present invention;

[0016] Figure 4 It is a three-dimensional schematic diagram of one side of the shift mechanism of the present invention;

[0017] Figure 5 It is a three-dimensional schematic diagram of the other side of the shift mechanism of the present invention. [Specific implementation method]

[0018] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0019] See also Figure 1-Figure 5 The present embodiment provides a rear-mounted precision speed shifting device 100 based on wire transmission, and the device 100 includes a finger shifter 10, a shift mechanism 20, a steel wire rope 30, and a steel wire rope protective cover 40.

[0020] Specifically, the finger shifter 10 is mounted on a bicycle handlebar 200 , the gear shifting mechanism 20 is mounted on a bicycle rear wheel, one end of the steel wire 30 is connected to the finger shifter 10 , and the other end of the steel wire 30 is connected to the gear shifting mechanism 20 .

[0021] Specifically, the shift mechanism 20 includes a shifter 50 and a transmission 60 .

[0022] Specifically, the shifter 50 is connected to the wire rope 30, and the transmission 60 is connected to the shifter 50. When the user turns the finger shifter 10, the wire rope 30 drives the shifter 50 located on the rear wheel, thereby driving the transmission 60 connected to the shifter 50 to shift gears. Since the shifter 50 is arranged on the shift mechanism 20, the transmission distance of the wire rope 30 between the shifter 50 and the shift mechanism 20 is shortened, thereby avoiding the precision error of the shifter 50 due to friction during the linear transmission process. Without modifying the shift accuracy, the input of the shifter 50 has a greater fault tolerance value.

[0023] Specifically, the gear selector 50 includes a gear selector housing 51 , an active seat 52 , a driven seat 53 , a traction rope 54 , an axis 55 , a speed regulating ratchet 56 , a first pawl 57 , and a second pawl 58 .

[0024] Specifically, the active seat 52 is connected to the steel wire rope 30, the driven seat 53 is arranged opposite to the active seat 52, and the driven seat 53 is connected to the transmission 60. The traction rope 54 connects the driven seat 53 and the transmission 60. The shaft 55 connects the active seat 52 and the driven seat 53.

[0025] Specifically, the speed regulating ratchet 56 has an end face ratchet 561 and a side face ratchet 562, and the speed regulating ratchet 56 is disposed between the active seat 52 and the driven seat 53. The first pawl 57 is disposed close to the active seat 52 and cooperates with the end face ratchet 561 of the speed regulating ratchet 56. The second pawl 58 is disposed close to the driven seat 53 and cooperates with the side face ratchet 562 of the speed regulating ratchet 56.

[0026] Specifically, the end face ratchet teeth 561 of the speed regulating ratchet 56 are extended in a direction close to the active seat 52 , and the side face ratchet teeth 562 of the speed regulating ratchet 56 are extended in a direction away from the axis 55 .

[0027] Specifically, the first pawl 57 includes a first meshing portion 571, a first impact portion 572, and a first rotating portion 573, and the second pawl 58 includes a second meshing portion 581, a second impact portion 582, and a second rotating portion 583. An end of the first impact portion 572 close to the driven seat 53 and an end of the second impact portion 582 close to the active seat 52 are respectively provided with buffer portions 59 that are opposite and in contact with the inclined surfaces 591.

[0028] Specifically, the first meshing portion 571 cooperates with the end face ratchet 561, the first impact portion 572 is connected to the first meshing portion 571 and extends toward the driven seat 53. The first rotating portion 573 is connected to the first impact portion 572 and is rotatably connected to the shaft 55 along an axial direction perpendicular to the shaft 55.

[0029] Specifically, the second meshing portion 581 cooperates with the side ratchet teeth 562, and the second striking portion 582 is connected to the second meshing portion 581 and extends away from the driven seat 53. The second rotating portion 583 is connected to the second striking portion 582, and is fixedly connected to the gear shifter housing 51, and is rotatably connected to the gear shifter housing 51 along an axial direction parallel to the shaft center 55.

[0030] Specifically, when the user moves the finger shifter 10, the first impact portion 572 rotates with the axis 55 and collides with the second impact portion 582. When the first impact portion 572 collides with the inclined surface 591 side of the buffer portion 59 of the second impact portion 582, the first impact portion 572 rotates around the first rotating portion 573, so that the first meshing portion 571 is separated from the end face pawl; when the first impact portion 572 collides with the buffer portion 59 of the second impact portion 582 away from the inclined surface 591, the second impact portion 582 rotates around the second rotating portion 583, so that the second meshing portion 581 is separated from the side face pawl, thereby utilizing the end face ratchet 561 and the side face ratchet 562 of the speed regulating ratchet 56 to achieve gear shifting, which is simpler and more stable than the traditional speed regulating structure.

[0031] Specifically, the axis 55 of the gear selector 50 includes an axis seat 551 , a bearing 552 , a first torsion spring 553 , a second torsion spring 554 , an upper end cover 555 , and a lower end cover 556 .

[0032] Specifically, the transmission 60 includes a first fixing portion 61 , a first swing arm 62 , a second swing arm 63 , a second fixing portion 64 , a guide wheel fixing portion 65 , and a guide wheel 66 .

[0033] Specifically, the first fixed portion 61 is fixed to the gear selector 50, the first swing arm 62 is rotatably connected to the first fixed portion 61, the second swing arm 63 is rotatably connected to the first fixed portion 61, and is arranged opposite to the first swing arm 62. The second fixed portion 64 is rotatably connected to the first swing arm 62 and the second swing arm 63, respectively, the guide wheel fixed portion 65 is fixedly connected to the second fixed portion 64, and the guide wheel 66 is connected to the guide wheel fixed portion 65. When the user moves the finger shifter 10, the steel wire rope 30 drives the gear selector 50 located at the rear wheel to shift gears, and the gear selector 50 drives the second fixed portion 64 on the transmission 60 to move relative to each other through the traction rope 54, thereby driving the guide wheel 66 to move, and then driving the chain connected to the guide wheel 66 to move, thereby achieving the purpose of shifting gears.

[0034] Specifically, a guide wheel 631 is provided on the second swing arm 63 , and the traction rope 54 is fixed to the first swing arm 62 after being wound around the guide wheel 631 .

[0035] Specifically, the finger shifter 10 includes a finger shifter 11, a winder 12, and a fixing seat 13. The finger shifter 11 is connected to the wire rope 30, the winder 12 gathers the wire rope 30, and the fixing seat 13 connects the winder 12 and the bicycle handlebar.

[0036] Specifically, one end of the wire rope protective cover 40 is connected to the winder 12 , and the other end is fixed to the first fixing portion 61 .

[0037] In this way, the present invention shortens the transmission distance of the wire rope 30 between the gear selector 50 and the gear shift mechanism 20 by placing the gear selector 50 at the rear end, thereby avoiding the precision error of the gear selector 50 due to friction during the linear transmission process. Without modifying the gear shifting accuracy, the input of the gear selector 50 has a greater fault tolerance value.

[0038] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A rear-mounted precision speed shifting device based on wire transmission, characterized in that: The device comprises a shifter mounted on the handlebar of the bicycle, a shift mechanism mounted on the rear wheel of the bicycle, and a steel wire rope connected to the shifter at one end and connected to the shift mechanism at the other end. The shift mechanism comprises a shifter connected to the steel wire rope and a transmission connected to the shifter. When the user shifts the shifter, the steel wire rope drives the shifter on the rear wheel, thereby driving the transmission connected to the shifter to shift gears. The gear shifter includes a gear shifter housing, an active seat connected to the wire rope, a driven seat arranged opposite to the active seat and connected to the transmission, a traction rope connecting the driven seat and the transmission, an axis connecting the active seat and the driven seat, a speed regulating ratchet having end face ratchet teeth and side face ratchet teeth and arranged between the active seat and the driven seat, a first pawl arranged near the active seat and matched with the end face ratchet teeth of the speed regulating ratchet, and a second pawl arranged near the driven seat and matched with the side face ratchet teeth of the speed regulating ratchet.

2. A rear-mounted precision speed shifting device based on wire transmission according to claim 1, characterized in that: The end face ratchet teeth of the speed regulating ratchet wheel are extended in a direction close to the active seat, and the side face ratchet teeth of the speed regulating ratchet wheel are extended in a direction away from the axis center. The first pawl includes a first meshing portion matched with the end face ratchet teeth, a first impact portion connected to the first meshing portion and extending in a direction close to the driven seat, a first rotating portion connected to the first impact portion and rotatably connected to the axis center along an axial direction perpendicular to the axis center, and the second pawl includes a second meshing portion matched with the side face ratchet teeth, a second impact portion connected to the second meshing portion and extending in a direction away from the driven seat, a first rotating portion connected to the second impact portion and fixedly connected to the gear selector housing and extending in a plane A second rotating part is connected to the gear shifter housing in an axial direction of the axis, and a buffer part is provided opposite to each other and with an inclined surface fitting therewith at one end of the first impact part close to the driven seat and at one end of the second impact part close to the active seat. When the user moves the finger shifter, the first impact part rotates with the axis and collides with the second impact part. When the first impact part collides with the inclined surface side of the buffer part of the second impact part, the first impact part rotates around the first rotating part to separate the first meshing part from the end face ratchet. When the first impact part collides with the buffer part of the second impact part away from the inclined surface side, the second impact part rotates around the second rotating part to separate the second meshing part from the side face ratchet.

3. A rear-mounted precision speed shifting device based on wire transmission according to claim 2, characterized in that: The axis of the gear selector includes an axis seat connected to the active seat at one end and connected to the driven seat at the other end, a bearing arranged between the active seat and the speed regulating ratchet, a first torsion spring arranged between the bearing and the speed regulating ratchet, a second torsion spring arranged at an end of the driven seat away from the active seat, an upper end cover arranged at an end of the active seat away from the driven seat, and a lower end cover arranged at an end of the driven seat away from the active seat.

4. The rear-mounted precision speed change gear shifting device based on wire transmission according to claim 3, characterized in that: The transmission includes a first fixed part fixed to the gear shifter, a first swing arm rotatably connected to the first fixed part, a second swing arm rotatably connected to the first fixed part and arranged opposite to the first swing arm, a second fixed part rotatably connected to the first swing arm and the second swing arm respectively, a guide wheel fixing part fixedly connected to the second fixed part, and a guide wheel connected to the guide wheel fixing part.

5. The rear-mounted precision speed change gear shifting device based on wire transmission according to claim 4, characterized in that: The second swing arm is provided with a guide wheel, and the traction rope is fixed to the first swing arm after being wound around the guide wheel.

6. A rear-mounted precision speed change gear shifting device based on wire transmission according to claim 5, characterized in that: The finger shifter comprises a finger shifter, a winder for gathering the steel wire rope, and a fixing seat connecting the winder and the bicycle handlebar, and the finger shifter is connected to the steel wire rope.

Images