TWI577602B - Powerless Bicycle Stepless Speed ​​Transmitter - Google Patents

Description

Stepless speed change device for electric power assisted bicycle

The invention relates to a stepless speed change device for a power assisted bicycle, in particular to a stepless speed change device suitable for an electric bicycle, which can achieve the dual functions of saving manpower and saving electricity.

Cycling is a fashionable sport in many advanced countries. Therefore, various professional sports bicycles have appeared on the market. Men's physical fitness is good, riding the aforementioned sports bike can be used for medium and long distance sports. Today, when you choose to travel on a holiday, you must consider that women and children do not have the physical strength to ride in the middle and long distances. To this end, there are electric-assisted bicycles for women and children to ride.

Commercially available electric bicycles are driven by a motor-driven bicycle. The electric bicycle can travel with a human foot on the foot pedal when there is no power. Such an electric bicycle is mainly electric, so that no shifting mechanism is provided in the pedal driving mechanism, which makes it more laborious to drive the pedal.

There is also a bicycle equipped with electric power. When people ride this kind of bicycle, they mostly use human foot drive and electric drive at the same time. People with poor physical strength are equipped with electric-assisted bicycles, which are more labor-saving and can ride long distances and achieve the purpose of exercise. When such an electric-assisted bicycle is driven without electric power, its performance must be similar to that of a general bicycle to meet the requirements of the user. Therefore, this type of bicycle is equipped with a variable speed change Speed mechanism. Multi-speed shifting devices require skilled techniques in operation, and this technique is practiced. Moreover, the operation at the time of using electric power assistance and the shifting operation at the time of the human foot pedal can make the user feel inconvenient in operation.

SUMMARY OF THE INVENTION The main object of the present invention is to provide a stepless speed change device for a power assisted bicycle, which can automatically adjust the speed ratio of the pedal drive in response to the speed of the electric drive bicycle, which is more labor-saving and more convenient in operation.

Still another object of the present invention is to provide a stepless speed change device for a power assisted bicycle that can control an appropriate amount of power output in response to the speed of the bicycle to achieve power saving.

In order to achieve the above object, the present invention provides a stepless speed change device for a power assisted bicycle that is coupled to a pedal drive mechanism of a bicycle. The shifting device comprises: an annular V-belt, an active opening and closing wheel set, and a driven opening and closing wheel set. The active opening and closing wheel set is driven by the pedal driving mechanism of the bicycle. The driven opening and closing wheel set can drive the rear wheel of the bicycle to rotate. The active opening and closing wheel set drives the driven opening and closing wheel set to rotate by the V-belt.

The active opening and closing wheel set includes: a first positioning turntable, a first movable turntable, a first compression spring, and a first spring carrier. The first positioning turntable and the first movable turntable can be rotated by a rotating shaft of the pedal driving mechanism. The V-belt is sleeved between the first positioning turntable and the first movable turntable. The first compression spring is pressed between the first movable turntable and the first spring carrier to push the first movable turntable toward the first positioning turntable to clamp the V-belt.

The driven opening and closing wheel set comprises: a second positioning turntable, a second movable turntable, a second anti-pressure spring, and a second spring support plate. The V-belt is sleeved on the second positioning dial Between the second activity carousel. The second compression spring is pressed between the second movable carousel and the second spring plate to push the second movable carousel toward the second positioning carousel to clamp the V-belt. The second positioning turntable is fixed on the rotating shaft of the rear wheel of the bicycle, so that the second positioning turntable and the second movable turntable can drive the rear wheel to rotate.

When the rotating shaft of the pedal driving mechanism drives the first positioning turntable of the active opening and closing wheel set and the first movable turntable rotates, the second positioning turntable and the second activity of the driven opening and closing wheel set can be driven by the V-belt The turntable turns.

10‧‧‧V belt

11‧‧‧Transmission box

20‧‧‧Active opening and closing wheel set

21‧‧‧First fixed turntable

22‧‧‧First activity turntable

23‧‧‧First compression spring

24‧‧‧First spring plate

30‧‧‧Driver opening and closing wheel set

31‧‧‧Second fixed turntable

32‧‧‧Second activity carousel

33‧‧‧Second pressure spring

34‧‧‧Second spring plate

40‧‧‧ pedal drive mechanism

41‧‧‧ shaft

42‧‧‧ pedal

43‧‧‧ crank

50‧‧‧ shaft

51‧‧‧ Rear wheel

FIG. 1 is an external view of an embodiment of the present invention.

Figure 2 is an exploded view of the active opening and closing wheel set in the embodiment of Figure 1.

Figure 3 is an exploded view of the driven opening and closing wheel set in the embodiment of Figure 1.

Figure 4 is a cross-sectional view of the active opening and closing wheel set.

Figure 5 is a cross-sectional view of the driven opening and closing wheel set.

Figure 6 is a schematic view showing the state of the reduction drive of the present invention.

Figure 7 is a schematic view showing the state of the high speed transmission of the present invention.

Please refer to Figure 1 to Figure 3. The stepless speed change device of the power assisted bicycle disclosed in the present invention is coupled to the pedal driving mechanism of the bicycle and can be automatically shifted by the man pedaling the pedal of the pedal driving mechanism. The shifting device comprises: an annular V-belt 10, an active opening and closing wheel set 20, and a driven opening and closing wheel set 30. In conjunction with FIG. 4, the active opening and closing wheel set 20 is disposed on the rotating shaft 41 of the pedal driving mechanism 40. In conjunction with FIG. 5, the driven opening and closing wheel set 30 is disposed on the rear wheel shaft 50 of the bicycle. The V-belt 10 is simultaneously placed on the active opening and closing wheel set 20 With the driven opening and closing wheel set 30. When the user steps on the footrest 42 to rotate the active opening and closing wheel set 20, the driven opening and closing wheel set 30 can be rotated by the V-belt 10. The driven opening and closing wheel set 30 can drive the rotating shaft 50 of the bicycle rear wheel to rotate.

The active opening and closing wheel set 20 includes a first positioning turntable 21, a first movable turntable 22, a first anti-pressure spring 23, and a first spring retaining plate 24. The first positioning turntable 21 and the first movable turntable 22 can be rotated by the rotating shaft 41 of the pedal driving mechanism 40. The first positioning turntable 21 can be disposed in a form fixed to the rotating shaft 41 of the pedal driving mechanism 40. Then, the first positioning turntable 21 is rotated at a fixed position of the rotating shaft 41. The first movable turntable 22 is laterally movable on the rotating shaft 41 of the pedal driving mechanism 40. The disk surfaces of the first positioning turntable 21 and the first movable turntable 22 are all inclined, and the two are disposed back to back, so that the distance between the first positioning turntable 21 and the first movable turntable 22 is increased from the axis. . The V-belt 10 is sleeved between the first positioning turntable 21 and the first movable turntable 22. The first spring carrier plate 24 is fixed to the rotating shaft 41 of the pedal driving mechanism 40. The first anti-pressure spring 23 is pressed between the first movable turntable 22 and the first spring retainer 24 to push the first movable turntable 22 toward the first positioning turntable 21 to clamp the V. Type belt 10.

The driven opening and closing wheel set 30 includes a second positioning turntable 31, a second movable turntable 32, a second anti-pressure spring 33, and a second spring receiving plate 34. The second positioning turntable 31 is fixed to the rotating shaft 50 of the bicycle rear wheel 51. The second positioning turntable 31 is rotatable at a fixed position on the rotating shaft 50. The second movable turntable 32 is capable of lateral movement on the rotating shaft 50. The second positioning turntable 31 and the second movable turntable 32 are capable of driving the rotation shaft 50 of the bicycle rear wheel 51 to rotate. The disk surfaces of the second positioning turntable 31 and the second movable turntable 32 are all beveled, and the two are disposed back to back, so that the distance between the second positioning turntable 31 and the second movable turntable 32 is outwardly transferred from the axis. increase. The V-belt 10 is sleeved between the second positioning turntable 31 and the second movable turntable 32. The second spring carrier plate 34 is fixed to the rotating shaft 50. The second anti-pressure spring 33 is pressed between the second movable turntable 32 and the second spring retainer 34 to push the second movable turntable 32 toward the second positioning turntable 31 to clamp the V. Type belt 10.

The pedal driving mechanism 40 includes a rotating shaft 41, two cranks 43 disposed at both ends of the rotating shaft, and two pedals 42 disposed on the two cranks 43. When the user steps on the two-legged pedal 42, the rotating shaft 41 can be rotated. The rotation of the rotating shaft 41 can drive the first positioning turntable 21 and the first movable turntable 22 of the active opening and closing wheel set 20 to rotate at the same time. The second positioning turntable 31 and the second movable turntable 32 of the driven opening and closing wheel set 30 are simultaneously rotated by the V-belt 10. The rotation of the second positioning turntable 31 and the second movable turntable 32 can drive the rotation of the rotating shaft 50 of the rear wheel 51.

When the user wants to ride the bicycle by manpower (foot pedal), a large torque is required, and the V-belt 10 automatically traps between the first positioning turntable 21 and the first movable turntable 22, as shown in FIG. . Then, the first movable turntable 22 is moved toward the first spring platen 24 to increase the compression amount of the first pressure-resistant spring 23, so that the compression spring 23 can provide a larger driving torque. Since the length of the V-belt 10 is fixed, the V-belt 10 at the moment will automatically expand the inner diameter at the driven opening and closing wheel set 30, and open to the second positioning turntable 31, the second activity. The larger outer diameter between the turntables 32.

When the bicycle is advanced to the high speed, the V-belt 10 gradually increases the inner diameter at the active opening and closing wheel set 20, so that the V-belt 10 is at the maximum of the first positioning turntable 21 and the first movable turntable 22. The outer diameter is shown in Figure 7. At this moment, the V-belt 10 is relatively narrowed in inner diameter at the driven opening and closing wheel set 30.

The shifting device of the invention is a stepless automatic shifting, which automatically adjusts according to the speed of the vehicle. The speed ratio allows the user to operate the shifting mechanism. That is, the user can focus on the power control to make the operation easier. When the user feels that the speed is too fast, the user can control the power output to reduce power consumption. With the bicycle of the foregoing reduction gear, a power generating device (not shown) can be disposed on the front wheel, and the electric device (not shown) can be charged. When the bicycle travels under the assistance of electric power, and the user simultaneously rides the bicycle by pedaling, the shifting device automatically adjusts to the optimal speed ratio according to the speed of the vehicle, thereby making the user more labor-saving.

A transmission body 11 capable of accommodating the transmission can be disposed on the bicycle body to provide protection to the transmission.

In summary, the bicycle provided with the transmission device provided by the invention is more labor-saving in manpower riding, and can also control the output according to the vehicle speed in the power supply and transmission, thereby achieving the purpose of power saving. In addition, the user can focus on controlling the amount of power output, which is easier to use and relatively safer.

The above description of the present invention is intended to be illustrative of the preferred embodiments of the invention. It will be apparent to those skilled in the art that such changes and modifications may be made without departing from the spirit and scope of the invention.

10‧‧‧V belt

11‧‧‧Transmission box

20‧‧‧Active opening and closing wheel set

21‧‧‧First fixed turntable

22‧‧‧First activity turntable

23‧‧‧First compression spring

24‧‧‧First spring plate

30‧‧‧Driver opening and closing wheel set

31‧‧‧Second fixed turntable

32‧‧‧Second activity carousel

41‧‧‧ shaft

50‧‧‧ shaft

Claims (3)

A stepless speed change device for a power assisted bicycle is coupled to a pedal driving mechanism of a bicycle; the shifting device comprises: a V-belt, which is an endless belt; and an active opening and closing wheel set, comprising: a first a positioning turntable, a first movable turntable, a first anti-pressure spring, and a first spring bearing plate; the first positioning turntable and the first movable turntable can be rotated by a rotating shaft of the pedal driving mechanism; The positioning dial can be rotated at a fixed position on the rotating shaft of the pedal driving mechanism; the first movable rotating disc can be laterally moved on the rotating shaft of the pedal driving mechanism; the first positioning rotating disc and the first movable rotating disc have a disc surface Is a beveled shape, and the two are arranged back to back, such that the distance between the first positioning turntable and the first movable turntable is increased outward from the axis; the V-shaped belt is sleeved on the first positioning turntable and the first activity The first spring bearing plate is fixed on the rotating shaft of the pedal driving mechanism; the first compression spring is pressed between the first movable rotating plate and the first spring bearing plate to push the first One live The turntable is adjacent to the first positioning turntable and clamps the V-belt; and a driven open/close wheel set includes: a second positioning turntable, a second movable turntable, a second anti-pressure spring, and a a second spring carrier; the second positioning turntable and the second movable turntable can drive the rotating shaft of the bicycle rear wheel; the second positioning turntable can rotate at a fixed position on the power output shaft; the second movable turntable The lateral movement of the second positioning turntable and the second movable turntable are both beveled, and the two are back-to-back, so that the second positioning turntable and the second movable turntable are The spacing is increased outward from the axis; the V-belt is sleeved between the second positioning turntable and the second movable turntable; the second spring carrier is fixed on the rotating shaft of the rear wheel; the second compression spring Be pressed in the second Between the movable turntable and the second spring carrier plate, the second movable turntable is pushed toward the second positioning turntable to clamp the V-shaped belt; the rotating shaft of the pedal driving mechanism drives the active opening and closing wheel set When the first positioning turntable and the first movable turntable rotate, the second positioning turntable and the second movable turntable of the driven open and close wheel set can be rotated by the V-belt. The stepless speed change device of the power assisted bicycle according to claim 1, wherein the first positioning turntable of the active opening and closing wheel set is fixed on a rotating shaft of the pedal driving mechanism. The stepless speed change device of the power assisted bicycle according to claim 1, wherein the second positioning turntable of the driven open/close wheel set is fixed on a rotating shaft of the rear wheel of the bicycle.