Guyed transmission

Abstract

The utility model discloses a stay wire type transmission which comprises a shell, and a rotatable winch is arranged in the shell. One end of the pull rope is connected to the winch, and the other end is connected with a sliding block; the pull rope is sleeved with an elastic piece, a limiting groove is formed in the shell, and the elastic piece and the sliding block are matched in the limiting groove. One end of the elastic piece abuts against the top of the limiting groove, and the other end of the elastic piece abuts against the sliding block. The speed change rope is connected to the sliding block, and the speed change rope extends out of the shell from the limiting groove. The variable-speed rope is not directly connected with the winch, the variable-speed rope and the winch are flexibly connected through the pull rope, the sliding block and the elastic piece, in the actual use process, the variable-speed rope is only subjected to pulling force, the variable-speed rope cannot be wound around the winch, and the variable-speed rope is not subjected to bending force, so that bending abrasion vibration of the variable-speed rope can be reduced, breakage of the variable-speed rope can be slowed down, and the service life of the variable-speed rope is prolonged. The service life of the speed change rope is prolonged. The variable-speed rope is not directly connected with the winch, so that the variable-speed rope is effectively prevented from being wound on the winch, and connection and disassembly of the variable-speed rope are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of bicycle gearbox technology, and more specifically to a cable-operated gearbox. Background Technology

[0002] The rear derailleur is mounted on the rear rack of a bicycle and works in conjunction with the bicycle's derailleur gears. By shifting gears, the derailleur engages the chain with gears of different sizes. Rear derailleurs are primarily installed on mountain bikes or cycling bikes to meet the needs of riders. When shifting gears, the cable-operated derailleur pulls the steel cable, causing the four-bar linkage of the derailleur to deform and move, thus shifting the chain guide and pushing the chain to engage different gears.

[0003] In current transmissions, the steel cable is directly connected to the winch, and the connection of the steel cable is not easy to operate. Due to the multiple turns and rotational bending of the steel cable on the winch, it is easy to cause fatigue breakage. At the same time, if the steel cable breaks, the broken steel cable will continue to bend and twist under the rotation of the winch, making the disassembly and replacement of the steel cable very cumbersome, time-consuming and labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to provide a cable-operated gearbox, in which the gear shift rope and the winch are flexibly connected by a pull rope, a slider, and an elastic element. In actual use, the gear shift rope is only subjected to tension and will not get tangled on the winch. The gear shift rope is not subjected to bending force, which can reduce bending wear and vibration of the gear shift rope, thereby effectively slowing down the breakage of the gear shift rope and extending its service life.

[0005] To address this, the present invention provides a cable-operated gearbox, comprising: a housing, wherein a rotatable winch is disposed within the housing; a pull rope, one end of which is connected to the winch and the other end of which is connected to a slider; an elastic element is sleeved on the pull rope, and a limiting groove is provided within the housing, wherein the elastic element and the slider cooperate within the limiting groove; one end of the elastic element abuts against the top of the limiting groove and the other end abuts against the slider; and a speed-changing rope, wherein the speed-changing rope is connected to the slider and extends out of the housing from the limiting groove.

[0006] Preferably, the limiting groove includes a first limiting groove and a second limiting groove that are connected to each other, the elastic element is clearance-fitted in the first limiting groove, and the slider is slidably fitted in the second limiting groove.

[0007] Preferably, a first limiting plate is provided at the top of the first limiting groove, and the first limiting plate is used to limit the elastic element.

[0008] Preferably, the first limiting plate is provided with a through hole, and the pull rope passes through the through hole and is connected to the winch.

[0009] Preferably, a second limiting plate is provided in the second limiting groove, and the second limiting plate is used to limit the slider.

[0010] Preferably, the second limiting plate is provided with a through hole, the diameter of the speed-changing rope is smaller than the diameter of the through hole, and the speed-changing rope extends out of the housing from the through hole.

[0011] Preferably, the top of the slider is provided with a connecting plate, and the bottom of the pull rope is connected and fixed to the connecting plate.

[0012] Preferably, the slider has a connecting cavity, and the bottom of the slider has a second connecting hole that communicates with the connecting cavity; the top of the speed-changing rope is connected to a fixing block, the fixing block is fitted inside the connecting cavity, and the speed-changing rope extends out of the slider from the second connecting hole.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This utility model provides a cable-operated gearbox, including a housing, in which a rotatable winch is provided; a pull rope, one end of which is connected to the winch and the other end of which is connected to a slider; an elastic element is sleeved on the pull rope, and a limiting groove is provided in the housing, in which the elastic element and the slider cooperate within the limiting groove; one end of the elastic element abuts against the top of the limiting groove and the other end abuts against the slider; a speed-changing rope is connected to the slider and extends out of the housing from the limiting groove.

[0014] The speed change rope is not directly connected to the winch. Instead, it is flexibly connected to the winch via a pull rope, slider, and elastic element. In actual use, the speed change rope is only subjected to tension and will not wrap around the winch or bend. This reduces bending wear and vibration, effectively slows down breakage, extends the rope's service life, and makes the speed change process smoother, more efficient, and more accurate.

[0015] In addition, the speed change rope is directly connected to the slider, and is not directly connected to the winch, which effectively avoids the speed change rope from getting tangled on the winch and makes it easy to connect and disconnect the speed change rope.

[0016] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is one of the structural schematic diagrams of an embodiment of the cable-operated transmission of this utility model;

[0018] Figure 2This is a second schematic diagram of the structure of one embodiment of the cable-operated transmission of this utility model;

[0019] Figure 3 This is the third structural schematic diagram of an embodiment of the cable-operated transmission of this utility model;

[0020] Figure 4 This is a schematic diagram of one embodiment of the first housing of this utility model;

[0021] Figure 5 This is a second schematic diagram of the structure of one embodiment of the first housing of this utility model;

[0022] Figure 6 This is the fourth structural schematic diagram of one embodiment of the cable-operated transmission of this utility model;

[0023] Figure 7 This is the fifth schematic diagram of an embodiment of the cable-operated transmission of this utility model;

[0024] Figure 8 This is the sixth structural schematic diagram of one embodiment of the cable-operated transmission of this utility model;

[0025] Figure 9 This is a schematic diagram of one embodiment of the slider of this utility model. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] This invention provides a cable-operated derailleur that can be applied to the derailleur of cycling equipment to provide power for shifting gears and enable derailleur operation. The shift rope on the derailleur can be threaded into the housing of the cable-operated derailleur and connected to a winch. The rotation of the winch pulls the shift rope, causing the derailleur to shift the chain, thus achieving the shifting effect.

[0028] like Figures 1-9 As shown, in one embodiment of this utility model, the cable-operated gearbox includes: a housing, in which a rotatable winch 20 is provided; a pull rope 30, one end of which is connected to the winch 20 and the other end of which is connected to a slider 40; an elastic element 50 is sleeved on the pull rope 30, and a limiting groove 11 is provided in the housing, wherein the elastic element 50 and the slider 40 are fitted in the limiting groove 11; one end of the elastic element 50 abuts against the top of the limiting groove 11 and the other end is connected to the slider 30; and a speed-changing rope 60, which is connected to the slider 30 and extends out of the housing from the limiting groove 11.

[0029] The housing includes a first housing 12 and a second housing 13 that are interlocked. Circuit boards, motors, and other components can be installed within the space where the first housing 12 and the second housing 13 are interlocked, and no specific limitations are imposed here. The first housing 12 and the second housing 13 are sealed together, and the sealing and interlocking connection method can be a method common in the art, and no specific limitations are imposed here.

[0030] The outer side of the first housing 12 is provided with a winch mounting groove 14, and the winch 20 is rotatably mounted in the winch mounting groove 14. The mounting method can be a rotatable mounting method commonly used in this technical field, and no specific limitation is made here. The winch 20 can be driven to rotate by a motor inside the housing, and no specific limitation is made here.

[0031] The limiting groove 11 is provided on the outside of the first housing 12, and the limiting groove 11 is located below the winch mounting groove 14.

[0032] A dust cover 15 is also installed on the outside of the first housing 12. The dust cover 15 is used to cover and shield components such as the winch 20, the pull rope 30, and the elastic element 50, making the housing components look beautiful and elegant. It can also play a role in dust and water protection, protecting components such as the winch 20, the pull rope 30, and the elastic element 50.

[0033] The limiting groove 11 includes a first limiting groove 111 and a second limiting groove 112 that are arranged from top to bottom and connected to each other. The elastic element 50 is fitted with a clearance in the first limiting groove 111, and the slider 40 is slidably fitted in the second limiting groove 112.

[0034] In one embodiment of this utility model, the elastic element 50 can be a helical spring, which is cylindrical in shape. The cross-sectional shape of the first limiting groove 111 can be arc-shaped. The first limiting groove 111 is adapted to the elastic element 50, and the elastic element 50 is fitted with the first limiting groove 111 with a gap. The first limiting groove 111 can limit the elastic element 50, so that the elastic element 50 can be effectively compressed or stretched.

[0035] The top of the first limiting groove 111 is provided with a first limiting plate 113. The first limiting plate 113 is used to limit the elastic member 50 and can limit the elastic member 50 by contact. When the pull rope 30 is wound on the winch 20, the elastic member 50 is pressed and compressed below the first limiting plate 113.

[0036] The first limiting plate 113 has a through hole 114. The pull rope 30 passes through the through hole 114 and is connected to the winch 20. The pull rope 30 can slide through the through hole 114 and be wound around the winch 20.

[0037] The bottom of the first limiting groove 111 is open, and the bottom of the first limiting groove 111 is connected to the second limiting groove 112.

[0038] In one embodiment of the present invention, the second limiting groove 112 can be a hollow cylinder, with both the top and bottom of the second limiting groove 112 being open, and the top of the second limiting groove 112 being connected to the bottom of the first limiting groove 111.

[0039] The slider 40 is cylindrical in shape and can slide up and down within the second limiting groove 112. The second limiting groove 112 is provided with a second limiting plate 115, which is used to limit the slider 40 and prevent the slider 40 from leaving the second limiting groove 112.

[0040] The second limiting plate 115 is provided with a through hole 116. The diameter of the speed change rope 60 is smaller than the diameter of the through hole 116, and the speed change rope 60 extends out of the housing through the through hole 116.

[0041] In one embodiment of this utility model, the top of the pull rope 30 is connected to the winch 20. Specifically, the winch 20 has a winding groove 21 circumferentially arranged around its edge, allowing the pull rope 30 to wind around the winding groove 21 by rotating the winch 20. The winch 20 has a notch, forming an installation step 22, and a connecting groove connecting the installation step 22 and the winding groove 21 is also provided inside the winch 20. The top of the pull rope 30 extends from the connecting groove into the installation step 22, and a fixing block 31 is provided on the top of the pull rope 30 to connect the pull rope 30 to the winch 20.

[0042] In one embodiment of this utility model, the bottom of the pull rope 30 is connected to the slider 40. Specifically, the top of the slider 40 is provided with a connecting plate 41, and the connecting plate 41 is provided with a first connecting hole 42. The bottom of the pull rope 30 passes through the first connecting hole 42 and is fixed to the connecting plate 41 by a fastening block (not shown in the figure), thereby allowing the bottom of the pull rope 30 to be connected to the slider 40. The fastening block can be circular, and the diameter of the fastening block is larger than the diameter of the first connecting hole 42, which can effectively prevent the fastening block from passing through the first connecting hole 42, thereby effectively limiting the connection of the pull rope 30, so that the bottom of the pull rope 30 can be effectively connected to the slider 40. In other preferred embodiments, the fastening block can be rectangular, and the side length of the fastening block is larger than the diameter of the first connecting hole 42.

[0043] The slider 40 is cylindrical in shape, and its outer diameter is larger than that of the elastic element 50, so that the bottom of the elastic element 50 can abut against the slider 40. As the slider 40 moves upward, it can effectively push the elastic element 50 upward.

[0044] The slider 40 has a hollow interior with a connecting cavity 43, and the bottom of the slider 40 has a second connecting hole 44 that communicates with the connecting cavity 43. The top of the speed change rope 60 is connected to a fixing block 61, which fits inside the connecting cavity 43. The speed change rope 60 passes through the second connecting hole 44, so that the speed change rope 60 can be connected to the slider 40.

[0045] The length of the pull rope 30 is greater than the circumference of the winch 20, which allows the pull rope 30 to be effectively wound around the winch 20, and also allows the pull rope 30 to have enough slack to fit the elastic element 50.

[0046] The material of the pull rope 30 can be a low-elongation flexible material commonly used in this technical field, such as polytetrafluoroethylene, which has the characteristics of flexibility, low elongation, high load ratio and bending resistance. When the winch 20 rotates, the pull rope 30, due to its flexibility, makes the load-bearing stress distribution more balanced, which can greatly reduce the friction when the pull rope 30 is wound around the winch 20.

[0047] The slider 40 can be made of a lightweight metal, such as aluminum alloy, making it lightweight and wear-resistant. An elastic element 50 is fitted over the pull rope 30. In actual use, the pull rope 30 and the elastic element 50 will form two equal components of force at 180 degrees along the force axis, allowing the slider 40 to maintain a self-centering, suspended state. During its reciprocating motion, the slider 40 will not rub against the housing, thus reducing overall contact wear of the cable-operated gearbox and extending its service life by more than 800,000 cycles.

[0048] In one embodiment of this invention, when the winch 20 rotates clockwise, it pulls the pull rope 30 and winds it around the winch 20. Simultaneously, it pulls the slider 40 and the speed-changing rope 60 upwards, and pushes the elastic element 50 upwards, compressing it. The movement of the speed-changing rope 60 enables the derailleur to move. When the winch 20 rotates counterclockwise, the elastic force of the elastic element 50 pushes the slider 40 and the speed-changing rope 60 downwards to reset. The downward reset of the speed-changing rope 60 enables the derailleur to move.

[0049] The material of the speed-changing rope 60 can be any steel wire rope commonly used in this technical field, and no specific restrictions are imposed here. The speed-changing rope 60 is not directly connected to the winch 20. The speed-changing rope 60 and the winch 20 are flexibly connected through the pull rope 30, the slider 40, and the elastic element 50. In actual use, the speed-changing rope 60 is only subjected to tension. The speed-changing rope 60 will not wrap around the winch 20, and the speed-changing rope 60 is not subjected to bending force, thereby reducing bending wear and vibration of the speed-changing rope 60. This can effectively slow down the breakage of the speed-changing rope 60, extend the service life of the speed-changing rope 60, and make the speed-changing process smoother, more efficient, and more accurate.

[0050] In addition, the speed change rope 60 is directly connected to the slider 40, and the speed change rope 60 is not directly connected to the winch 20, which effectively avoids the speed change rope 60 from getting tangled on the winch 20, and makes it easy to connect and disconnect the speed change rope 60.

[0051] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A cable shift, characterized in that, The utility model relates to a pull-cord type transmission device, which comprises a shell, a rotatable winch arranged in the shell, a pull cord having one end connected to the winch and the other end connected to a sliding block, an elastic member sleeved on the pull cord, a limiting groove arranged in the shell, the elastic member and the sliding block being fitted in the limiting groove, one end of the elastic member abutting against the top of the limiting groove and the other end abutting against the sliding block, and a variable-speed rope connected to the sliding block and extending out of the shell from the limiting groove.

2. The pull-cord type transmission device according to claim 1, wherein the limiting groove comprises a first limiting groove and a second limiting groove connected to each other, the elastic member being clearance-fitted in the first limiting groove and the sliding block being slidably fitted in the second limiting groove.

3. The pull-cord type transmission device according to claim 2, wherein the top of the first limiting groove is provided with a first limiting plate for limiting the elastic member.

4. The pull-cord type transmission device according to claim 3, wherein the first limiting plate is provided with a through hole, the pull cord passing through the through hole and being connected to the winch.

5. The pull-cord type transmission device according to claim 2, wherein the second limiting groove is provided with a second limiting plate for limiting the sliding block.

6. The pull-cord type transmission device according to claim 5, wherein the second limiting plate is provided with a through hole, the diameter of the variable-speed rope being smaller than the diameter of the through hole, and the variable-speed rope extending out of the shell from the through hole.

7. The pull-cord type transmission device according to claim 1, wherein the top of the sliding block is provided with a connecting plate, and the bottom of the pull cord is fixedly connected to the connecting plate.

8. The pull-cord type transmission device according to claim 1, wherein the sliding block is provided with a connecting cavity, the bottom of the sliding block is provided with a second connecting hole connected to the connecting cavity, the top of the variable-speed rope is connected to a fixing block, the fixing block being fitted in the connecting cavity, and the variable-speed rope extending out of the sliding block from the second connecting hole. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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