JPS6218394B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a first drive system that drives a rear wheel by a foot-operated pedal crank, and a roller that can be pressed against and separated from the outer periphery of the rear wheel. The present invention relates to a bicycle with an auxiliary engine that includes a second drive system that drives a rear wheel by an auxiliary engine.

[Prior art]

In this type of bicycle with an auxiliary engine, the second drive system is engaged and disengaged only by manually pressing and separating a roller against the rear wheel.

[Problem that the invention seeks to solve]

However, such pressure contact and separation of the rollers is not only troublesome as it has to be carried out each time a temporary stop or start is made at an intersection, etc., and it is generally not possible to start from a stopped state using only a small-output auxiliary engine. 1 The vehicle speed is brought up to a certain level by pedal running using the drive system, and then the rollers are pressed against each other and the auxiliary engine is used to drive the vehicle. However, manual pressure contact operation of the rollers while the pedals are running requires delicate and sophisticated techniques. In other words, if pressure is applied at low speeds, the load on the auxiliary engine becomes excessive, causing the engine to stop, and if pressure is applied at high speeds, engine braking causes a shocking reduction in vehicle speed. Some models use a centrifugal clutch to engage and release the driving force in engines that do not use a chain or the like to press and separate the rollers, but such systems have a part that is directly connected to the rear wheel. Therefore, if this is used in combination with the first drive system of the present invention, a problem arises in that the load becomes large when driving using the foot pedal.

The present invention provides a bicycle with an auxiliary engine in which the second drive system is engaged and disengaged by manually pressing and separating a roller from the rear wheel, and by providing a centrifugal clutch appropriately placed in the power transmission mechanism of the bicycle, the second drive system is engaged and disengaged by manually pressing and separating a roller from the rear wheel. The second drive system is sandwiched between the left and right arms of the pedal crank. The vehicle is made compact and the width between the arms is narrowed to make it easier to travel using foot pedals.

[Means for solving problems]

For this purpose, the bicycle with an auxiliary engine according to the present invention has a first drive system 2 that drives the rear wheel 13 by a pedal crank 21 rotatably supported on the body frame 10, as illustrated in the embodiment of the accompanying drawings.
0, the auxiliary engine 31, and the vehicle body frame 10.
The rear wheel 13 is rotatably supported by a free end of a swinging member 103 that is swingably supported on the rear wheel 13.
a roller 32 that can be pressed against and separated from the outer periphery of the engine; and a transmission mechanism 3 that connects this roller to the auxiliary engine 31.
In the bicycle with an auxiliary engine, the transmission mechanism 33 is provided on one side of the roller 32 coaxially with the roller 32 and rotatable with respect to the roller 32, and is supported by the swinging member 103. a rotating body 334 that rotates in conjunction with the auxiliary engine 31, and this rotating body and the roller 3.
2, the centrifugal clutch 331 engages when the rotating body rotates at a high speed higher than a predetermined speed, and transmits the driving force from the auxiliary engine 32 to the roller 32. It is something.

[Operation and effect of the invention]

When starting from a stopped state, the centrifugal clutch 331 is activated by increasing the speed of the vehicle by pedaling with the rollers 32 in pressure contact with the rear wheels 13 and increasing the rotation speed by increasing the output of the auxiliary engine 31. It is automatically engaged and the vehicle starts running using the auxiliary engine 31. The bicycle with an auxiliary engine of the present invention is easy to operate since there is no need to press and separate the rollers when stopping temporarily at an intersection, etc., and even beginners can easily operate the bicycle. When running with a type pedal crank, the rollers are isolated from the rear wheels, which reduces the load and makes running easier. Furthermore, since the centrifugal clutch is placed on one side of the roller, which is smaller and has a simpler structure than the auxiliary engine, the width of the auxiliary engine can be reduced by the amount of the centrifugal clutch, but the width of the roller side is reduced. The auxiliary engine is not wider than the auxiliary engine, so the second drive system, which is sandwiched between the left and right arms of the pedal crank, can be made compact. can be made even easier.

〔Example〕

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows an embodiment of a bicycle with an auxiliary engine according to the present invention.
A front fork 12 is attached to the front of the body frame 10 to support the front wheel 11, and a pair of support arms 1 are attached to the upper and lower tops of the vehicle body frame 10 to support the rear wheel 13.
4, 14, a first drive system 20 attached to the lower top of the vehicle body frame 10, and a first drive system 20 attached to the vehicle body frame 10.
A second drive system 30 is installed adjacent to the drive system 20. The first drive system 20 includes a pedal crankshaft 211 that is rotatably supported by a bearing boss 10a provided at the lower top of the vehicle body frame 10, and a pedal crankshaft 211 that protrudes in opposite directions from both parts of the pedal crankshaft 211. A pedal crank 21 consisting of a pair of arms 212, 212 and foot pedals 213, 213 rotatably attached to the protruding ends of the arms 212, 212, a large chain wheel 22 fixed to the pedal crankshaft 211, and a large chain wheel 22 fixed to the pedal crankshaft 211. It is composed of a chain wheel 22 and a chain 23 wound between a small chain wheel 131 provided on the rear wheel 13, so that the rear wheel 13 is driven when the pedal crank 21 is rotated in the counterclockwise direction shown in the figure. It's summery. In the figure, reference numeral 15 indicates a steering handle, and reference numeral 16 indicates a saddle.

A second drive system 30 is disposed between the arms 212, 212 of the rotating pedal crank 21. The second drive system 30 includes an auxiliary engine 31, a roller 32 that can be pressed against and separated from the outer periphery of the rear wheel 13, and a transmission mechanism 33 that connects the auxiliary engine 31 and the roller 32.
The auxiliary engine 31 is rotatably supported by a bracket 101 attached to the lower top of the vehicle body frame 10, and is biased to rotate clockwise in the drawing by a tension spring 102 that is fixed at one end to the bracket 101. Note that the auxiliary engine 31 has a crankshaft 311 serving as its output shaft arranged parallel to the pedal crankshaft 211. In addition, the roller 32
is rotatably supported by the free end of an arm 103 which is swingably pivoted and suspended from a bracket 104 fixed to a support arm 14 provided on the vehicle body frame 10, and the arm 103 is fixed near its base end. The roller 32 is rotated by a rod-shaped spring 17 to elastically and detachably press the roller 32 against the outer peripheral front surface of the rear wheel 13. That is, a knob 171 is attached to the free end of the rod-shaped spring 17, and when this is lifted upward, the arm 103 rotates counterclockwise in the figure, the roller 32 comes into contact with the rear wheel 13, and the knob 171 is attached to the free end of the bar spring 17. 1
When 71 is further lifted upward, the rod-shaped spring 17
is curved in an arched shape, and its elasticity presses the roller 32 against the rear wheel 13, so that the rotation of the roller 32 is transmitted to the rear wheel 13, and the rotation of the rear wheel 13 is transmitted to the rear wheel 13.
2. Further, the rod-shaped panel 17 cooperates with a locking member 18 fixed to the support arm 14 of the vehicle body frame 10 to hold the roller 32 at least at a position separated from the position where it is pressed against the rear wheel 13. ing. The locking plate 18 has, as shown in FIG.
A recess 181a that holds the bar spring 17 at a position where the roller 32 presses against the rear wheel 13, and a recess 181 that holds the rod spring 17 at a position where the roller 32a is separated from the rear wheel 13.
A groove 181 having a diameter b is formed.

As shown in FIG. 3, the transmission mechanism 33 includes a driving pulley 333 fixed to the crankshaft 311, and a driven pulley 333 provided on one side of the roller 32 coaxially with the roller 32 and rotatable with respect to the roller 32 and supported by the arm 103. 334, a V-belt 335 stretched between both pulleys 333, 334, and first and second centrifugal clutches 331 and 332 provided between the driven pulley 334 and the roller 32. The first centrifugal clutch 331 is composed of a first centrifugal weight 331a pivotally supported by a driven pulley 334 and a first drum 331b fixed to the roller 32, and is configured to rotate at a predetermined rotation speed ratio with respect to the auxiliary engine 31. When the rotating driven pulley 334 reaches a predetermined high speed or higher, the first centrifugal weight 331a comes into pressure contact with the inner periphery of the first drum 331b surrounding it, and transfers the driving force from the auxiliary engine 31 through the roller 32. The power is then transmitted to the rear wheels 13. The second centrifugal clutch 332 also includes a second centrifugal weight 332a pivotally supported by the roller 32, and a second drum 332 formed protruding toward the roller 32 side of the driven pulley 324.
b, and the roller 32 is connected to the rear wheel 1.
3, when the second centrifugal weight 332a reaches a predetermined high speed or higher, the second centrifugal weight 332a is driven by the second drum 332b.
The rotation of the rear wheel 13 is controlled by the roller 3.
2. The signal is transmitted to the auxiliary engine 31 via the driven pulley 334, V-belt 335, and drive pulley 333, so that the auxiliary engine 31 can be started. The second drive system 30 has a roller 32 pressed against and separated from the outer periphery of the rear wheel 13 so that the driving force between the auxiliary engine 31 and the rear wheel 13 that constitute the second drive system 30 can be transmitted to each other. Second drive system 30
can be configured compactly. Note that the reference numeral 40 in FIG.
It is attached via rubber bands 41, 41 between them.

FIG. 4 shows a minicycle which is another embodiment of the bicycle with an auxiliary engine according to the present invention.
The body frame 10 of this minicycle is made by press forming steel plates and assembling them by welding, and the upper support arm of the pair of support arms 14 is attached above the body frame 10 via a shock absorber 51.
Further, the lower support arms are each rotatably supported below the vehicle body frame 10, and the rear wheel 13 is formed to be movable up and down.

Therefore, in this embodiment, the second drive system 30 is
The structure is similar to that shown in FIG. 3, and as shown in FIGS. 4 and 5, the rotating pedal crank 2
It is accommodated between the arms 212, 212 of 1. That is, the auxiliary engine 31 constituting the second drive system 30 is arranged above the pedal crankshaft 211, and the roller 32 is arranged immediately after the pedal crankshaft 211. This arrangement increases the minimum ground clearance of the second drive system, thereby reducing soiling of the second drive system 30 by mud and the like. As in the first embodiment, the roller 32 is pivotally supported at the tip of an arm 103 that is swingably suspended from a bracket 104, and is elastically and detachably connected to the front surface of the outer circumference of the rear wheel 13 by a bar spring 17. is pressed against. In addition, the roller 3
2 is connected to an auxiliary engine 31. In addition,
The front fork 12 in this embodiment employs a so-called simple telescopic shock absorber, and this minicycle is equipped with shock absorbers for both the front and rear wheels 11 and 13.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a bicycle with an auxiliary engine according to the present invention, and FIG.
FIG. 3 is an enlarged sectional view taken along line - in FIG. 1, and FIG. 4 is a side view showing another embodiment of the bicycle with an auxiliary engine according to the present invention. FIG. 5 is a rear view taken along the - line in FIG. 4. Explanation of symbols, 10...Vehicle frame, 11...
Front wheel, 13... Rear wheel, 20... First drive system, 21
... Pedal crank, 30 ... Second drive system, 31
... Auxiliary engine, 32 ... Roller, 33 ... Transmission mechanism, 103 ... Swinging member (arm), 331
...Centrifugal clutch (first centrifugal clutch), 334
...Rotating body (driven pulley).

Claims (1)

[Claims] 1. A first drive system that drives the rear wheels by a pedal crank rotatably supported on the vehicle body frame;
an auxiliary engine; a roller that is rotatably supported by a free end of a swinging member that is swingably supported on the vehicle body frame and that can be manually pressed against and separated from the outer periphery of the rear wheel; and this roller is connected to the auxiliary engine; In the bicycle with an auxiliary engine, the transmission mechanism is provided on one side of the roller so as to be coaxial with the roller and rotatable with respect to the roller, and is supported by the swinging member. a rotating body that rotates in conjunction with the auxiliary engine;
A centrifugal clutch is provided between the rotating body and the roller and engages when the rotating body rotates at a high speed higher than a predetermined speed to transmit the driving force from the auxiliary engine to the roller. A bicycle with an auxiliary engine.