TWI391294B - Derailleur for bicycle - Google Patents

Description

Bicycle transmission

The present invention relates to a bicycle transmission, and more particularly to a bicycle transmission that can be positioned in a plurality of positions according to changes in bicycle speed. The bicycle transmission of the present invention also includes a plurality of adjustment devices for restricting operation of the transmission between maximum and minimum actuation ranges. This is the innovative use of the transmission adjustment device.

Bicycle transmissions are typically located on a number of coaxially disposed chainrings, also known as bicycle sprocket wheels, which provide the bicycle rider with a choice of different gear mesh ratios to make it easier to operate the bicycle. Such a transmission includes a first joint, a second joint, and a coupling device that connects the first and second joints and drives the first and second joints. The first joint connects the transmission to the bicycle, and the second joint is provided with a chain guide corresponding to different bicycle speeds, and the hinge movement of the connecting device can position the chain guide in a plurality of different positions .

In general, the above-mentioned connecting device is a conventional four-bar linkage mechanism as disclosed in the "Derailleur" case of U.S. Patent No. 4,259,873. However, it is discussed in this U.S. case that conventionally implemented as a parallelogram joint has some disadvantages, so that the joint is implemented in a box shape and the components of the first and second joint transmission mechanisms are placed in the joint. Inside.

In view of the above-mentioned lack of conventional structure, the inventors have invented a "bike transmission" which provides a simple structure, space saving and aesthetically pleasing product.

The "bicycle transmission" of the present invention is mounted on a bicycle having a plurality of toothed discs, the transmission including a first joint and a connecting device connected to the first joint. The connecting device comprises a content setting portion, an outer receiving portion and a transmission device, and the inner and outer receiving portions are partially opened. The transmission includes a second joint that is coupled to the first and second joints by the connecting device. The transmission drives the first and second joints. The transmission additionally includes an adjustment device that controls the transmission to operate between a minimum to maximum range of actuation. In addition, the transmission is characterized in that the adjusting device is engaged with the inner and outer receiving portions, so that the inner and outer receiving portions are coupled to each other, and the transmission device is installed in the inner and outer receiving portions. .

Other objects, advantages and novel features of the invention will be apparent from the description and appended claims.

The technology, means and functions of the present invention are described in detail with reference to the accompanying drawings.

Referring to Figures 1 to 10, in a first embodiment of the bicycle transmission of the present invention, a plurality of toothed discs are provided on the bicycle to provide a choice of different gear ratios of the rider, which makes the operation of the bicycle more convenient. The plurality of spurs correspond to different bicycle speeds, and the transmission is positioned at different positions depending on the speed of the bicycle. The transmission includes a first joint 10, a connecting device 20, and a second joint 30. The connecting device 20 connects the first and second joints 10, 30 to each other. The first joint 10 is disposed on a bicycle frame, and the connecting device 20 and the second joint 30 are coupled to the bicycle by the first joint 10. The connecting device 20 is pivotally connected to the first joint 10 according to the first axis. In this embodiment, the first joint 10 includes a protrusion 11 , and the connecting device 20 is engaged with the first joint 10 by being disposed on the protrusion 11 . Furthermore, the connecting device 20 is pivotable relative to the projection 11, whereby the projection 11 extends along the first axis. The second joint 30 is pivotally connected to the connecting device 20 according to the second axis. In this embodiment, the connecting device 20 and the second joint 30 are coupled to each other by the cooperation of the bonding bolt 41 and the second coupling bolt 42. In addition, the second joint 30 can be pivoted relative to one of the first binding bolt 41 or the second binding bolt 42 , so that the first binding bolt 41 and the second binding bolt 42 are along the first The two axes extend. A chain guide 31 is coupled to the second joint 30 corresponding to each of the spurs for adjusting the speed of the bicycle. For example, the toothed disc corresponding to the chain guide 31 in FIG. 7 is different from the corresponding toothed disc in FIG. 9, so the bicycle speed corresponding to FIG. 7 is different from the vehicle speed corresponding to FIG. In this embodiment, two transmission guide wheels are disposed on the chain guide 31, which are a top transmission guide wheel and a bottom transmission guide wheel, and the top and bottom transmission guide wheels are engageable with a transmission chain. In addition, Figure 7 and Figure 9 respectively show that the transmission is limited to the maximum operating range and the minimum operating range. The transmission includes two adjusting devices 50 disposed on the connecting device 20, and one of the adjusting devices 50 is in contact with the first limiting portion 12 of the first joint 10 to limit the connecting device 20 relative to the first joint The pivoting of 10, so the transmission is limited to the maximum operating range. Another adjustment device 50 is in contact with the second limiting portion 32 of the second joint 30 to limit pivoting of the second joint 30 relative to the connecting device 20, so that the transmission is limited to a minimum actuation range. However, the present invention does not limit the number of adjustment devices 50, and one or more adjustment devices 50 can be equally applied to the embodiments. In the present embodiment, each adjusting device 50 includes an external thread that conforms to the internal thread of the connecting device 20.

Furthermore, the connecting device 20 comprises a transmission 23 which drives the first and second joints 10, 30. The transmission 23 includes two mutually spaced transmission gears, which are a top transmission gear 231 and a bottom transmission gear 232, respectively. In this embodiment, the outer peripheral edges of the top and bottom transmission gears 231, 232 each have teeth. The transmission 23 also includes a drive belt 233 that engages the top and bottom drive gears 231, 232 and simultaneously drives the top and bottom drive gears 231, 232. In this embodiment, the belt 233 can be implemented in the form of a chain and made of an elastic material. The inner circumference of the belt 233 has teeth that mesh with the teeth of the inner circumference of the belt 233. In addition, the connecting device 20 includes a content portion 21 and an outer housing portion 22, wherein the inner and outer housing portions 21, 22 are coupled to each other but independent of each other, and the transmission device 23 is accommodated in the inner and outer housing portions. 21 and 22, the inner and outer housing portions 21 and 22 are respectively disposed on opposite sides of the transmission device 23. The innovative use of the present invention is that the adjusting device 50 simultaneously engages the inner and outer receiving portions 21, 22, and the adjusting device 50 is combined with the content setting portion 21 to prevent the inner and outer receiving portions 21, 22 from being separated from each other. . In this embodiment, the outer housing portion 22 includes two grip holes 221. When the outer housing portion 22 is combined with the content portion 21, the two adjusting devices 50 can respectively pass through the two grip holes 221 .

Figure 11 is a second embodiment of the bicycle shifter of the present invention, substantially the same as the first embodiment of the present invention, the only difference being that the embodiment of the transmission 23a is slightly different from the transmission 23 of the first embodiment. The components of the second embodiment that are similar to, but not identical to, the first embodiment are labeled with "a" to facilitate discrimination. The transmission 23a includes two transmission gears, a top transmission gear 231a and a bottom transmission gear 232a, and the top and bottom transmission gears 231a, 232a are spaced apart from each other. Unlike the first embodiment, the top and bottom transfer gears 231a, 232a do not have teeth thereon. A pull rod 233a is hinged and simultaneously drives the top and bottom drive gears 231a, 232a. Unlike the first embodiment, the tie rod 233a does not have teeth thereon.

Figure 12 is a third embodiment of the bicycle shifter of the present invention, substantially the same as the first embodiment of the present invention, the only difference being that the embodiment of the transmission 23b is slightly different from the transmission 23 of the first embodiment. In the third embodiment, members which are similar to the first embodiment but are not identical, and "b" are added after the labeling to facilitate discrimination. The transmission 23b includes two transmission gears, a top transmission gear 231b and a bottom transmission gear 232b, and the top and bottom transmission gears 231b, 232b are spaced apart from each other. As with the first embodiment, the outer peripheral edges of the top and bottom transfer gears 231b, 232b have teeth. A plurality of gears 233b selectively engage the top drive gear 231b or the bottom drive gear 232b and simultaneously drive the top and bottom drive gears 231b, 232b. Each of the outer edges of the gear 233b has a plurality of teeth.

The connecting device 20 can also be embodied as a conventional four-bar linkage.

As far as the above is concerned, it can be concluded that the present invention has the following advantages:

1. The "bike transmission" of the present invention, wherein the chain guides respectively correspond to two different toothed discs, so that the bicycle can be adjusted to two different speeds. The transmission includes two adjustment devices and is limited to the maximum actuation range and the minimum actuation range. The two adjusting devices are disposed on the connecting device, and one of the adjusting devices is in contact with the first joint to restrict pivoting of the connecting device relative to the first joint, so that the transmission is limited to a maximum operating range. Another adjustment device is in contact with the second joint to limit pivoting of the second joint relative to the attachment device, such that the transmission is limited to a minimum actuation range.

2. The "bike transmission" of the present invention, wherein the connecting device comprises a content setting portion and an outer receiving portion, wherein the inner and outer receiving portions are coupled to each other but independent of each other, and the transmission device is accommodated in the inner and outer housing portions The inner and outer housing portions are respectively disposed on opposite sides of the transmission device.

3. The "bike transmission" of the present invention, wherein the adjusting device simultaneously engages with the inner and outer receiving portions, so that the adjusting device is combined with the content setting portion and the content setting portion is prevented from being separated from the outer receiving portion.

The above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, so that the numerical value is changed or the equivalent element is replaced, or the equivalent of the scope of the patent application of the present invention. Changes and modifications are still within the scope of the invention patent.

10. . . First joint

11. . . Bulge

12. . . First limit

20. . . Connecting device

twenty one. . . Content department

twenty two. . . External design department

221. . . Grip hole

twenty three. . . transmission

231. . . Top drive gear

232. . . Bottom drive gear

233. . . Transmission belt

23a. . . transmission

231a. . . Top drive gear

232a. . . Bottom drive gear

233a. . . Pull rod

23b. . . transmission

231b. . . Top drive gear

232b. . . Bottom drive gear

233b. . . gear

30. . . Second joint

31. . . Chain guide

32. . . Second limit

41. . . First combined plug

42. . . Second combined plug

50. . . Adjustment device

Figure 1 is an external view of a bicycle shifter according to a first embodiment of the present invention.

Figure 2 is a partial exploded view of Figure 1 of the present invention.

Fig. 3 is another external view of the bicycle transmission according to the first embodiment of the present invention, which is viewed from a different perspective from Fig. 1.

Figure 4 is a cross-sectional view of the bicycle transmission of the present invention taken along line 4-4 of Figure 1.

Figure 5 is a cross-sectional view of the bicycle transmission of the present invention taken along line 5-5 of Figure 1.

Figure 6 is a cross-sectional view of the bicycle transmission of the present invention taken along line 6-6 of Figure 1.

Figure 7 is a schematic illustration of the bicycle transmission of the present invention being limited to its maximum operating range.

Figure 8 is a cross-sectional view of Figure 7 of the present invention, showing the position of the transmission at the transmission.

Figure 9 is a schematic illustration of the bicycle transmission of the present invention being limited to its minimum operating range.

Figure 10 is a cross-sectional view of Figure 9 of the present invention, showing the state of the transmission at the transmission.

Figure 11 is a partially exploded view of a bicycle shifter in accordance with a second embodiment of the present invention.

Figure 12 is a partially exploded view of a bicycle shifter in accordance with a third embodiment of the present invention.

10. . . First joint

20. . . Connecting device

30. . . Second joint

Claims (6)

A transmission that can be mounted on a bicycle, the bicycle is provided with a plurality of toothed discs, the transmission includes: a first joint; a connecting device includes a content setting portion, an outer receiving portion and a transmission device, the inner and outer parts a partial opening arrangement, the connecting device is coupled to the first joint; a second joint, the connecting device combining the first and second joints; a first limiting portion; a second limiting portion; and a Adjusting device; wherein the transmission drives the first and second joints; wherein, when the transmission is limited to a maximum operating range, the adjusting device is in contact with the first limiting portion; when the transmission is limited to a minimum operating range, The adjusting device is in contact with the second limiting portion; wherein the adjusting device is engaged with the inner and outer receiving portions, so that the inner and outer receiving portions are coupled to each other, and the transmitting device is accommodated in the inner and outer receiving portions Wherein the transmission includes a top drive gear and a bottom drive gear spaced from each other. The bicycle transmission of claim 1, wherein the outer periphery of the top and bottom transmission gears have teeth. The bicycle transmission of claim 2, wherein the transmission comprises a belt that engages and transmits the top and a bottom drive gear; wherein the inner circumference of the drive belt has a plurality of teeth, the teeth of the outer periphery of the top and bottom drive gears meshing with a plurality of teeth of the inner circumference of the drive belt. The bicycle transmission of claim 2, wherein the transmission comprises a plurality of gears, the plurality of gears selectively meshing with the top drive gear or the bottom drive gear to drive the top drive gear or the bottom Transmission gear; each of the gears has teeth on the outer circumference. The bicycle transmission of claim 1, wherein the transmission includes a tie rod hinge that drives the top and bottom transmission gears. The bicycle transmission of claim 1, wherein the adjusting device comprises an external thread that conforms to an internal thread of the connecting device.