JP3001770U - Bicycle drive - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bicycle drive device having a simple and inexpensive structure that does not use gears and can be driven with a sufficiently increased rotational torque on a slope. [Structure] A loading platform-shaped fixed base, a hanging plate 4 pivotally supported by a front portion on one side of the fixed base, and a first clutch lever 12 for raising a rear end of the hanging plate. An engine 5 mounted and fixed to the hanging plate, a first sprocket roller 7 connected to the rotation output shaft, a first pulley 9 connected to the rotation output shaft, and a front end hanging down via a swing shaft. An operating plate 6 that is swingably attached to the rear end of the plate and is always biased upward at the rear end, a second sprocket roller 8 that is rotatably attached to the operating plate, and is rotatable on the operating plate. Second attached
And a second clutch lever for moving the actuating plate up and down. A bicycle drive device comprising: a first pulley and a second pulley; and a belt 11 spanning between a first pulley and a second pulley.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive device for a bicycle, which can be easily attached to an ordinary bicycle to form a bicycle with a motor.

[0002]

[Prior art]

 Bicycles are very convenient for driving on flat roads, downhills and relatively short distances, but driving uphill and driving long distances puts an excessive amount of effort on the driver. Therefore, various types of bicycles with a driving device have been proposed in which a simple driving device (auxiliary power device) is attached while maintaining the original function of the bicycle.

However, the conventional bicycle drive device has the following drawbacks. (1) In a bicycle drive device using a gear reducer, the drive mechanism is complicated, the cost is high, and foreign matter is caught between the gears, and the device is easily damaged. (2) In a device configured to transmit the rotational force of the engine to the wheels via the sprocket rollers, sufficient rotational torque cannot be obtained on a slope, which causes a problem in drivability. Also, when driving on a rainy day, mud adheres between the sprocket rollers and the wheels and slips easily.

[0004]

[Problems to be solved by the device]

 The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and has the following object. (1) To provide a bicycle drive device that has a simple and inexpensive structure that does not use gears and that can be driven with a sufficiently increased rotational torque on a slope. (2) To provide a bicycle drive device in which slippage between a sprocket roller and a wheel is prevented on a rainy day or the like.

[0005]

[Means for Solving the Problems] According to the present invention, in order to solve the above-mentioned problems, one of (a) a loading platform-like fixed platform to be mounted on a bicycle body in place of the loading platform and (b) a stationary platform Side plate, which is pivotally supported with its front part pivotally supported, and whose rear end is always pulled downward by the first spring, and (c) the rear plate against the first spring. The first clutch lever that should be raised, (d) the engine that is attached and fixed to the drooping plate with the rotary output shaft inserted through the cutout hole formed in the drooping plate, and (e) the rotary output shaft. The first sprocket roller connected to, (f) the first pulley connected to the rotation output shaft, and (g) the front end is swingably attached to the rear end of the hanging plate via the swing shaft. At the same time, an operating plate whose rear end is constantly urged upward by a second spring, and (h) a second plate rotatably attached to the operating plate. Between the sprocket roller, (i) a second pulley having a diameter different from that of the first pulley and rotatably attached to the working plate, and (j) between the first pulley and the second pulley. There is provided a bicycle drive device comprising: a belt that is bridged over; and (k) a second clutch lever for lowering a rear end of the actuation plate against a second spring. Further, according to the present invention, in the above-mentioned configuration, the first sprocket roller and the second sprocket roller are each formed of a pipe-shaped body, and have a plurality of through holes in a peripheral wall portion. A drive is provided. Also, according to the present invention, there is provided a bicycle drive device characterized in that, in the above structure, the second clutch lever is connected to the actuation plate via a wire. Further, according to the present invention, in the above structure, the second pulley is moved in the vertical direction by the operation of the second clutch lever, and the distance between the first pulley and the second pulley is changed. A bicycle drive device is provided.

[0006]

【Example】

 Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a perspective view showing a structure of a main part of a bicycle drive device according to an embodiment of the present invention, and FIG. 2 is a side view showing a state in which the drive device is attached to a bicycle. In these figures, 1 is a bicycle body, and 2 is a drive device. The drive device 2 basically comprises a fixed mount 3, a hanging plate 4, an engine 5, an operating plate 6, a first sprocket roller 7, a second sprocket roller 8, a first pulley 9, a second pulley 10, It comprises a V-belt 11, a first clutch lever 12, and a second clutch lever 13.

The fixed mount 3 is a mount-shaped mount that is attached to the bicycle main body instead of the load carrier, and may have an appropriate structure such as the structure described in Japanese Utility Model Application Laid-Open No. 57-174293. A pipe 14 to be fitted to the horizontal shaft fixed to the fixed base 3 is welded to an appropriate position on the front side surface of the hanging plate 4, and an engine mounting hole 15 and a cutout hole for mounting the first sprocket roller 7 are attached. 16 are provided on each side, and 12 first clutch levers are fixed to the upper edge toward the front. A fixing member 17 having an L-shaped cross section is further welded to the lower rear portion of the hanging plate 4 so as to extend further rearward. A spring mounting hole 18 is formed in the fixing member 17, and one end of a first spring 19 is mounted in the spring mounting hole 18. The other end of the first spring 19 is attached to a spring attachment member (not shown) provided at a proper position of the bicycle main body 1, and the first spring 19 causes the hanging plate 4 to always pull downward. It is designed so that it can be eaten.

The engine 5 is fixed to the hanging plate 4 by mounting bolts 20. As the engine 5, for example, a small engine such as a two-cycle engine can be used. The output of the engine 5, that is, the number of rotations, can be controlled by a throttle lever (not shown) attached to the handle portion of the bicycle.

An output shaft (not shown) of the engine 5 is connected to a first sprocket roller 7, and a first pulley 9 is attached to a position of the first sprocket roller 7 near the hanging plate 4. The first sprocket roller 7 and the first pulley 9 may have an integrated structure from the beginning, or may be a combination of separate members by an appropriate method. A plurality of through holes 21 are formed in the peripheral wall portion of the first sprocket roller 7.

A front end of the actuating plate 6 is attached to the rear end of the hanging plate 4 via a swing shaft 22 as shown in the figure. A second sprocket roller 8 and a second pulley 10 are rotatably attached to the side surface of the operation plate 6. The second sprocket roller 8 and the second pulley 10 may be an integrated structure from the beginning, or may be a combination of separate members by an appropriate method. A plurality of through holes 23 are formed in the peripheral wall portion of the second sprocket roller 8. A V-belt 11 is stretched between the first pulley 9 and the second pulley 10. The diameter of the second pulley 10 is preferably about 2 to 3 times the diameter of the first pulley 8. A second spring 24 is attached between the lower rear end of the operating plate 6 and the rear end of the L-shaped member 17, and the second spring 24 constantly pushes the operating plate 6 upward. It is like this. Further, one end of a wire 25 is attached to the lower portion of the rear end of the operation plate 6, and the other end of the wire 25 is connected to the second clutch lever 13. By operating the second clutch lever 13, the operating plate 6 moves up and down against the second spring 24 or by the biasing force of the second spring 24, but the operating plate 6 contacts the lower position of the bicycle wheel. In this position, the first sprocket roller 7, the second sprocket roller 8 and the swing shaft 22 are arranged so that the positional relationship between them is on a straight line. When the wheels are separated from each other, the positional relationship of the above three members deviates from the straight line, and the distance between the first sprocket roller 7 and the second sprocket roller 8 is lower than that of the operating plate 6. It is configured to be slightly shorter than the distance when in position. The second clutch lever 13 may have a structure similar to that of a hand brake of an automobile, for example.

Next, the operation will be described. When it is desired to drive a bicycle using the bicycle drive device, the switch of the drive device is turned on to drive the engine 5, and the first clutch lever 12 is pushed upward. As a result, the drooping plate 4 to which the engine 5 is attached and fixed rotates by a predetermined angle around the pipe 14 fitted to the horizontal shaft fixedly mounted on the fixed base 3, and as shown in FIG. The sprocket roller 7 is in contact with the wheels. This state is maintained by the action of the first spring 19. At this time, the second sprocket roller 8 is separated from the wheel by the action of the second spring 24, and the distance between the first sprocket roller 7 and the second sprocket roller 8 is Is slightly shorter than the distance when the wheel touches the wheel. As a result, the tension applied to the V-belt 11 is relaxed and the load is reduced. Driving in this state is suitable for flat roads and gentle slopes.

When driving on a steep slope, the first clutch lever 13 is pushed up while the first clutch lever 12 is pushed up. As a result, as shown in FIG. 4, the working plate 6 is pulled downward, the second sprocket roller 8 comes into contact with the wheel, and the seesaw motion of the working plate 6 causes the first sprocket roller 7 to separate from the wheel. To do. Then, the first sprocket roller 7, the second sprocket roller 8 and the swing shaft 22 are aligned with each other, and the distance between the first sprocket roller 7 and the second sprocket roller 8 is longer than in the above case. Then, tension is automatically applied to the V belt 11. In this state, due to the difference in diameter between the first pulley 9 and the second pulley 10, the engine rotation is decelerated 2-3 times more than in the above case and the torque is 2-3 times larger, and the climbing force is increased. Get higher

When it is desired to use the bicycle as a normal bicycle, both the first clutch lever 12 and the second clutch lever 13 may be turned off.

[0014]

[Effect of device]

 As described above in detail, according to the present invention, the above-mentioned configuration allows the engine to be operated with a large engine rotation on a flat road and with a large rotation torque on a slope. Moreover, since the structure is simple without using gears, the device can be provided at low cost, and it can be easily attached to a normal bicycle, and is excellent in operability. Furthermore, by forming a plurality of through holes in the sprocket roller, slip between the sprocket roller and the wheel can be effectively prevented on a rainy day.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of a main part of a bicycle drive device according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which the drive device is attached to a bicycle body.

FIG. 3 is an operation explanatory diagram of the embodiment of the present invention.

FIG. 4 is an operation explanatory diagram of the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bicycle main body 2 Bicycle drive device 3 Fixed mount 4 Hanging plate 5 Engine 6 Operating plate 7 1st sprocket roller 8 2nd sprocket roller 9 1st pulley 10 2nd pulley 11 V belt 12 1st clutch lever 13 second clutch lever 14 pipe 17 fixing member 19 first spring 22 swing shaft 24 second spring

Claims (4)

[Scope of utility model registration request] 1. A loading platform-shaped fixed mount, which is attached to a bicycle main body in place of a loading platform, and (b) a front part is pivotally supported on one side of the fixed mount so as to be swingable. A hanging plate whose rear end is always pulled downward by a spring, and (c) a hanging plate which should lift the rear end against the first spring.
Clutch lever, (d) an engine mounted and fixed to the drooping plate with the rotary output shaft being inserted through the cutout hole formed in the drooping plate, and (e) the first sprocket connected to the rotary output shaft. The roller, (f) the first pulley connected to the rotation output shaft, (g) the front end is swingably attached to the rear end of the hanging plate via the swing shaft, and the second spring constantly An operating plate whose rear end is biased upward, (h) a second sprocket roller rotatably attached to the operating plate, and (i) a diameter different from that of the first pulley. A freely attached second pulley, (j) a belt spanned between the first pulley and the second pulley, and (k) the operating plate is lowered against the second spring at the rear end. And a second clutch lever to be rotated. Use the drive device. 2. The bicycle drive according to claim 1, wherein each of the first sprocket roller and the second sprocket roller is formed of a pipe-shaped body and has a plurality of through holes in a peripheral wall portion. apparatus. 3. The bicycle drive device according to claim 1, wherein the second clutch lever is connected to the actuation plate via a wire. 4. The second clutch lever is operated to operate the second clutch lever.
4. The bicycle drive device according to claim 1, wherein the pulley moves vertically, and the distance between the first pulley and the second pulley changes.