TWI534039B - Bicycle of the transmission - Google Patents

Description

Bicycle transmission

The invention relates to bicycles, and more particularly to a bicycle transmission.

In order to be able to cope with different road conditions, the bicycle is usually equipped with a front derailleur and a rear derailleur, the front derailleur is mainly equipped with a large chainring, and the rear derailleur is mounted with the sprocket, so that by changing the large chainring and chain The gear ratio between the wheels is used to achieve the shifting effect.

As far as the conventional technology is concerned, for example, the French Patent No. 258079 is to drive the two parallel arms by the motor, so that the two arms together drive the chain guide to change the position of the chain guide to achieve the shifting effect. However, in the aforementioned conventional patent case, the motor needs to output a considerable torque to smoothly drive the two-arm lever, so that the long-term use can easily cause the motor to be overloaded and malfunction, and thus the conventional patent case can be known. It has the problem of poor durability and short service life.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a bicycle transmission that can reduce the load of a drive source to improve durability and extend service life.

To achieve the foregoing objectives, the transmission of the present invention includes a frame mount, a drive source, a linkage assembly, and a chain guide. The driving source has a driving arm; the linkage assembly has a first linkage and a second connection a movable base, the top end of the first connecting base is pivotally connected to the frame fixing base by a first shaft member, and the top end of the first connecting base extends an arm outwardly, and the end of the arm is supported by a second shaft One end of the driving arm is pivoted, so that the first connecting seat can be pivoted relative to the frame fixing seat by driving the driving arm, and the top end of the second connecting seat is pivotally connected by a third shaft member a frame fixing base; the chain link is pivotally connected to the bottom end of the first connecting seat by a fourth shaft member, and the bottom end of the second connecting seat is pivotally connected by a fifth shaft member, so that the chain guide The frame can be driven by the first and second linkages to change the position, so that the shifting effect can be achieved while reducing the load of the driving source.

Preferably, the inner side of the driving arm has a guiding groove, and the second shaft member is sleeved with a bearing, and the bearing is rotatably disposed in the guiding groove, so that the driving arm can stably and smoothly drive the first linkage seat.

Preferably, the driving source further has a mounting base and a motor, the mounting seat is fixed to the frame fixing seat, the motor is disposed in the mounting seat and has an output shaft, and the output shaft is connected to one end of the driving arm So that the drive arm can be driven by the power of the motor.

Preferably, the driving source further has a shifting wire fixing base and a shifting line fixed to the outer side of the driving arm, and one end of the shifting line is fixed to the shifting wire fixing seat, and the driving arm is One end of the frame is pivotally coupled to the frame so that the drive arm can be driven by the tension of the shift line.

Preferably, the mounting seat is provided with a Hall sensor, one side of the driving arm is connected to a magnet seat, and a magnet is disposed in the magnet holder, and the magnet corresponds to the Hall sensor, so that Sensing the shift position.

"First Embodiment"

10‧‧‧Transmission

20‧‧‧ frame mount

30‧‧‧ drive source

32‧‧‧ Mounting

34‧‧‧Motor

342‧‧‧ Output shaft

36‧‧‧ drive arm

362‧‧‧ Guide slot

40‧‧‧ linkage components

41‧‧‧First linkage

42‧‧‧ Arm

43‧‧‧ bearing

44‧‧‧Second joint seat

P1‧‧‧ first shaft

P2‧‧‧second shaft

P3‧‧‧third shaft

P4‧‧‧4th shaft

P5‧‧‧ fifth shaft

50‧‧‧Guide chain frame

60‧‧‧ gear position sensing device

62‧‧‧ Hall sensor

64‧‧‧ magnet

66‧‧‧ Magnet holder

"Second embodiment"

12‧‧‧Transmission

22‧‧‧ frame mount

45‧‧‧Torque spring

70‧‧‧ drive source

72‧‧‧ drive arm

722‧‧ ‧ guide slot

74‧‧‧Transmission line mount

76‧‧‧Transmission line

"Third embodiment"

14‧‧‧Transmission

52‧‧‧Guide frame

80‧‧‧ linkage components

81‧‧‧First linkage

82‧‧‧Second joint seat

"Fourth embodiment"

16‧‧‧Transmission

83‧‧‧ stretching spring

Fig. 1 is a perspective view showing a first embodiment of the present invention.

Fig. 2 is a plan view showing a first embodiment of the present invention.

Fig. 3 is another plan view showing the first embodiment of the present invention, mainly showing the state of the chain guide after the position is changed.

Fig. 4 is a perspective view showing a second embodiment of the present invention.

Figure 5 is a plan view showing a second embodiment of the present invention.

Fig. 6 is another plan view showing the second embodiment of the present invention, mainly showing the state of the chain guide after the position is changed.

Figure 7 is a perspective view showing a third embodiment of the present invention.

Figure 8 is a plan view showing a third embodiment of the present invention.

Figure 9 is another plan view showing a third embodiment of the present invention, mainly showing the state of the chain guide after the position is changed.

Figure 10 is a perspective view showing a fourth embodiment of the present invention.

Figure 11 is a plan view showing a fourth embodiment of the present invention.

Fig. 12 is another plan view showing the fourth embodiment of the present invention, mainly showing the state of the chain guide after the position is changed.

Referring to Figures 1 and 2, the transmission 10 of the first embodiment of the present invention is mainly driven electrically and used in conjunction with a large toothed disc (not shown) of a bicycle. The transmission 10 of this embodiment includes a frame mount 20, a drive source 30, a linkage assembly 40, and a chain guide 50.

The frame mount 20 is mounted to one of the bicycle frames (not shown) for use as a primary structural support.

The drive source 30 has a mount 32, a motor 34, and a drive arm 36 in this embodiment. The mounting seat 32 is fixed to the top surface of the frame fixing base 20. The motor 34 is mounted in the mounting base 32 and has an output shaft 342 extending outside the mounting base 32. The top end of the driving arm 36 is coupled to the output shaft 342 of the motor 34, so that the mounting shaft 32 is attached to the output shaft 342 of the motor 34. The driving arm 36 can be pivoted by the driving of the output shaft 342 of the motor 34. Further, the inner side of the bottom end of the driving arm 36 has a guide groove 362.

The linkage assembly 40 has a first linkage seat 41. The top end of the first linkage housing 41 is pivotally connected to the frame holder 20 by a first shaft member P1, and the top end of the first linkage housing 41 extends outwardly from the arm 42. A second shaft member P2 is disposed at the end of the arm 42. The second shaft member P2 is sleeved with a bearing 43. The bearing 43 is rotatably disposed in the guiding groove 362 of the driving arm 36, so that the first connecting seat 41 is supported. A pivotal connection is formed between the arm 42 and the drive arm 36. In addition, the linkage assembly 40 has a second linkage 44, and the top end of the second linkage 44 is pivotally coupled to the frame mount 20 by a third shaft member P3.

The guide frame 50 is pivotally connected to the bottom end of the first linkage seat 41 by a fourth shaft member P4, and is pivotally connected to the bottom end of the second linkage base 44 by a fifth shaft member P5.

According to the above structure, when the motor 34 starts to output power, as shown in FIGS. 2 and 3, the output shaft 342 of the motor 34 drives the driving arm 36 to pivot, and then the driving arm 36 passes through one end wall of the guiding groove 362. Pushing the bearing 43 sleeved on the second shaft member P2 to pivot the first linkage seat 41 relative to the frame fixing base 20, and driving the chain guide frame 50 to change position during the pivoting process, and actuating on the chain guide frame 50 During the process, the second linkage 44 is pivoted relative to the frame fixing seat 20, so that the shifting effect can be achieved.

On the other hand, in order to obtain the correct shift position in the electric drive mode, the transmission 10 of the present invention further includes a gear sensing device 60. As shown in FIG. 2, the gear sensing device 60 has a The sensor 62 and a magnet 64 are disposed in the mounting seat 32. The magnet 64 is disposed in a magnet holder 66 and corresponds to the Hall sensor 62. One end of the magnet holder 66 is connected to the driver. One side of the arm 36. Thereby, when the driving arm 36 pivots, the magnet 64 is simultaneously rotated relative to the Hall sensor 62, so that the Hall sensor 62 can transmit a gear sensing signal to a controller by the change of the magnetic field ( The interpretation is not shown in the figure.

4 and 5, in addition to the second embodiment of the present invention, the transmission 12 of the second embodiment of the present invention has almost the same structural configuration as the first embodiment. The main difference is the driving source used. different.

In this embodiment, the driving source 70 has a driving arm 72, a shifting wire fixing base 74, and a shifting line 76. The top end of the driving arm 72 is pivotally connected to the frame fixing seat 22, and the inner side of the bottom end of the driving arm 72. There is a guide groove 722, and the guide groove 722 is sleeved on the bearing 43 of the arm 42 of the first linkage seat 41. The shift line fixing seat 74 is fixed to the outer side of the drive arm 72, and one end of the shift line 76 is fixed to the shift line fixing seat. 74.

In addition, the linkage assembly 40 further has a torsion spring 45. The torsion spring 45 is sleeved on the third shaft member P3 and abuts against the frame fixing seat 22 and the second linkage seat 44 at opposite ends thereof for the second linkage. Block 44 provides the power to recover.

Therefore, when the shifting line 76 is pulled, as shown in FIGS. 5 and 6, the shifting line 76 will drive the driving arm 72 to pivot, and then the driving arm 72 will be pushed to the second by the one end wall of the guiding groove 362. The bearing 43 of the shaft member P2 makes the first The linkage 41 pivots relative to the frame fixing seat 22, and drives the chain guide 50 to change position during the pivoting process. During the operation of the chain guide 50, the second linkage 44 is further driven relative to the frame fixing seat 22 Pivot, so that the shifting effect can be achieved. When the pulling force applied to the shifting line 76 is released, the second connecting seat 44 is urged by the return spring of the torsion spring 45 to push the chain guide 50, causing the chain link 50 to change position again.

Referring to Figures 7 to 9, a transmission 14 according to a third embodiment of the present invention, the transmission 14 of the present embodiment is identical in structural configuration to the first embodiment described above, the most important difference being that the guide frame 52 is fitted with a bicycle. One of the rear sprocket is used, however, in order to fit the installation with the rear sprocket, in the present embodiment, the driving arm 36 of the driving source 30, the first and second linking blocks 81, 82 of the linking assembly 80, and the guide The chain frame 52 is somewhat different in structure from the first embodiment, but is not functionally changed. Therefore, in order to save space, the operation of the embodiment will not be repeated here.

Finally, please refer to FIGS. 10 to 12, which are a transmission 16 according to a fourth embodiment of the present invention. The transmission 16 of the present embodiment also adopts the same structural configuration as that of the third embodiment described above in conjunction with the rear sprocket, but with the foregoing The main difference of the third embodiment is that the present embodiment is driven manually, that is, the same drive source 70 as that of the second embodiment (that is, the combination of the drive arm 72, the shift mount 74 and the shift line 76). Since the manual driving process has been disclosed in the foregoing second embodiment, in order to save space, no further details are provided herein.

In addition, the interlocking assembly 80 of the present embodiment replaces the torsion spring 45 of the second embodiment with a tension spring 83. The two ends of the tension spring 83 are respectively hooked to the third shaft member P3 and the fourth shaft member P4. To release the shift line 76 The first and second linkages 81, 82 are provided with a restoring force to drive the chain guide 52 to change position.

In summary, the transmission of the present invention can be used with a large or rear sprocket according to actual needs, and the driving source can be used to reduce the load of the driving source during use, so as to improve overall durability and extend service life. the goal of.

10‧‧‧Transmission

20‧‧‧ frame mount

30‧‧‧ drive source

32‧‧‧ Mounting

34‧‧‧Motor

342‧‧‧ Output shaft

36‧‧‧ drive arm

362‧‧‧ Guide slot

40‧‧‧ linkage components

41‧‧‧First linkage

42‧‧‧ Arm

43‧‧‧ bearing

44‧‧‧Second joint seat

P1‧‧‧ first shaft

P2‧‧‧second shaft

P3‧‧‧third shaft

P4‧‧‧4th shaft

P5‧‧‧ fifth shaft

50‧‧‧Guide chain frame

60‧‧‧ gear position sensing device

62‧‧‧ Hall sensor

64‧‧‧ magnet

66‧‧‧ Magnet holder

Claims (7)

A bicycle transmission includes: a frame fixing base; a driving source having a driving arm; a linkage assembly having a first linkage seat and a second linkage seat, the top end of the first linkage seat being The first shaft member is pivotally connected to the frame fixing base, and the top end of the first connecting seat extends an arm outwardly, and the end of the arm is pivotally connected to the driving arm by a second shaft member, and the second connecting seat is The top end is pivotally connected to the frame fixing seat by a third shaft member; and a guide chain frame pivotally connected to the bottom end of the first connecting seat by a fourth shaft member and pivotally connected by a fifth shaft member The bottom end of the second linkage. The bicycle transmission of claim 1, wherein the driving source further has a mounting seat and a motor, the mounting seat is fixed to the frame fixing base, the motor is disposed in the mounting seat and has an output shaft, The output shaft is coupled to one end of the drive arm. The bicycle transmission as claimed in claim 2, further comprising a gear sensing device, wherein the gear sensing device has a Hall sensor and a magnet, and the Hall sensor is disposed in the mounting seat. The magnet is disposed in a magnet holder and corresponds to the Hall sensor, and the magnet holder is coupled to one side of the driving arm. The bicycle transmission of claim 1, wherein one end of the driving arm is pivotally connected to the frame fixing base, the driving source further has a shifting wire fixing base and a shifting line, and the shifting wire fixing base is fixed to the driving arm On the outer side, one end of the shift line is fixed to the shift line mount. The bicycle transmission of claim 4, wherein the linkage assembly further has a tension spring, and the two ends of the tension spring are respectively hooked to the third shaft member and the fourth shaft member. The bicycle transmission of claim 4, wherein the linkage assembly further has a torsion spring, the torsion spring is sleeved on the third shaft member, and the two ends of the torsion spring respectively abut the frame fixing seat and the The second linkage seat. The bicycle transmission of claim 1, wherein the inner side of the driving arm has a guiding groove, and the second shaft member is sleeved with a bearing, and the bearing is rotatably disposed in the guiding groove.