JPH0867288A - Starter device for bicycle with prime mover - Google Patents

Abstract

PURPOSE: To provide a starter device for a bicycle with prime mover having a purpose that running can be switched to the power running with the prime mover-provided bicycle left as in a running attitude during the artificial running, to prevent a pedal from becoming heavy further to reduce a cost with a simple structure. CONSTITUTION: In a bicycle with prime mover mounting a power device in a rear wheel, the bicycle has a drive friction wheel 26b fixedly provided in the rear wheel 3, driven friction wheel 31 mounted through a one-way clutch in a crankshaft, draw friction wheel 33 and a draw mechanism 113 supporting the draw friction wheel by a cantilever pin 39, draw lever 34, supporting piece 36, pin 38 and a leaf spring 38 to be always contactlessly energized by a spring 40 and swiveled by a start lever to bring the draw friction wheel into contact with the drive friction wheel 26b and the driven friction wheel 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting device for a power unit of a motorbike which is equipped with an engine on the body of a bicycle and can be driven manually and powered by the engine.

[0002]

2. Description of the Related Art As a motorized bicycle equipped with an engine and capable of both manpowered driving and powered driving, the output of a high-speed two-cycle engine is decelerated and used.
Conventionally, various structures have been proposed in which an engine and a speed reducer are integrated as a power unit and are mounted on a bicycle body via a bracket or incorporated in a part of the body. An example of a power unit for a motor-driven bicycle introduced in Japanese Patent Laid-Open No. 59-45280 is an engine equipped with a kick pedal for starting at one end of a rear wheel shaft that is a drive wheel, and a rear wheel shaft sandwiching the wheel. By arranging the transmission on the other end side and arranging the engine and the speed reducer outside the rotation range of the crank pedal, it is possible to narrow the left and right space between the crank pedal and the power transmission device and the width of the motor-powered bicycle, This is a compact design and improved transmission efficiency.

In addition to the above, as a known engine starting method, a recoil starter is provided in the engine in place of the kick pedal, the grip of the recoil starter is pulled by hand, and the bicycle is run by pedaling with the foot. However, there is a method in which the clutch is engaged and the crankshaft is rotated through the speed reducer.

[0004]

SUMMARY OF THE INVENTION In order to drive a bicycle with a prime mover by a power transmission device, it is necessary to start an engine. When starting with the kick pedal method and recoil starter method, it is necessary to stop the motorized bicycle and kick the kick pedal with your foot, or pull the grip of the recoil starter with your hand, which can not be done while running, and this method There is a problem in that the power plant generally has a complicated structure, a large size, and a high cost.

Further, in a system in which a clutch is engaged and started during manual running, the force applied to the pedal and the inertia force are input from the rear axle to open the speed reducer in reverse and the crankshaft is actuated via a one-way clutch. Since the engine is rotated and started, the rotational speed of the input is greatly increased, the pedal becomes heavy, and the structure becomes complicated. This type of motorized bicycle has a persistent need for a simple structure and low cost.

It is an object of the present invention to provide a starter device for a motorized bicycle which can be switched to power running while the driving posture is maintained during manual driving of the motorized bicycle, the pedals do not become heavy, and the structure is simple and inexpensive. It is in.

[0007]

According to a first aspect of the present invention, a power unit in which an engine and a speed reducer are integrated in a case is attached to rear wheels,
In a power plant for a motorized bicycle that is capable of manpowered travel by pedals and powered by an engine, a driving friction wheel that is concentrically fixed to the rear wheels and a one-way clutch that is concentric with the crankshaft of the engine that protrudes outside the case are used. Driven friction wheel mounted on the drive friction wheel, an approach friction wheel provided so that the drive friction wheel and the driven friction wheel can contact each other, and the drive friction wheel and the driven friction wheel supported by the approach friction wheel. It is characterized in that it has an approaching mechanism that can be brought into contact with or detached from.

According to a second aspect of the present invention, in a starter for a motor-assisted bicycle according to claim 1, the moving friction wheel is configured so as to be swingable in a direction perpendicular to the moving direction of the friction wheel, and the frictional force received from the driving and driven friction wheels is reduced. The feature is that it is a harmony type that acts in the direction.

According to a third aspect of the present invention, in a starting device for a motor-assisted bicycle according to claim 1, the shifting mechanism urges the shifting friction wheel to a non-contact position, and the shifting friction wheel swings against the spring. It is characterized by having a starter lever for making it.

[0010]

When the vehicle is driven manually, the friction wheel is always in a non-contact state due to the urging force of the spring, so the pedal sprocket and the chain are driven by the rotational force generated on the pedal crankshaft by depressing the pedal like a normal bicycle. , Tell the rear wheel through the driven sprocket. At this time, the driving force is cut off from the engine side by a one-way claw clutch provided between the hub and the output shaft cylinder of the speed reducer. If inertia is input from the rear wheels, the driven sprocket is disconnected from the pedal crankshaft by the one-way claw clutch and from the engine by the one-way (roller) clutch provided on the engine crankshaft.

In the case of power traveling, as in the case of manpower traveling, the vehicle is stepped on by pedaling and when the speed comes out, the starter lever is pulled to actuate the pulling mechanism against the spring force to swing the pulling friction wheel. It is moved to make contact with both the driving friction wheel and the driven friction wheel, and the inertia force of the vehicle body is transmitted from the driving friction wheel to the driven friction wheel via the friction friction wheel, and the crankshaft is rotated to start the engine. When the engine starts, the rotation speed of the crankshaft increases, but the rotational force of the engine is not transmitted to the driven friction vehicle due to the one-way clutch of the driven friction vehicle. When the engine starts, return the starter lever. Then, the pulling mechanism brings the pulling friction wheel into non-contact with the biasing force of the spring. When the throttle grip is turned to open the throttle and the engine speed rises, the centrifugal clutch works to transmit the rotational force to the speed reducer, which reduces the speed and drives the rear axle to drive the vehicle. The torque of the rear wheel is not transmitted to the driven sprocket by the one-way claw clutch of the driven sprocket.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic left side view of a motor-equipped bicycle equipped with a power unit having a starter according to the present invention, FIG. 2 is a vertical sectional view taken along the line AA of FIG. 1, and FIG. 4 is a front view of a starting device for a motorbike according to the present invention, FIG. 5 is a view taken in the direction of arrow B in FIG. 4, and FIG. 6 is a view taken in the direction of arrow C in FIG. The main body of the motorbike shown in the figure has a structure similar to that of a general rotation, so only the essential parts will be described. In the figure, 1 is a body frame of a motorbike, 2 is a rear fork of the body frame 1, 3 is a rear wheel, 4 is a pedal, 5 is a drive sprocket directly connected to a shaft (pedal crank) of the pedal 4, and 6 is one direction. A driven sprocket attached to the rear wheel 3 via a claw clutch, 7 a chain wound around a drive sprocket 5 and a driven sprocket 6, 8 a throttle grip, 9 a starter lever 10, and an engine and a speed reducer integrated together. It is a power unit.

In FIG. 3, 11 is a positioning nut 12
And a rear axle fixed to the rear forks by a lock nut 13, 14 is a gear case of a speed reducer integrally formed with an engine crankcase, 15 is an engine crankshaft (output shaft), and 16 is attached to the crankshaft 15. The centrifugal automatic clutch 17 is formed integrally with the outer rotor of the centrifugal automatic clutch 16 and is externally fitted to the crankshaft 15 via the one-way (roller) clutch 18, and the small gear 17a is formed on the outer peripheral surface. Hollow input shaft (input shaft of the reduction gear), 19 is an intermediate shaft integrally formed with a small gear 19a,
Reference numeral 20 is a large gear that meshes with a small gear 17a fixed to the intermediate shaft 19.

A large gear 21 is rotatably fitted to the rear wheel shaft 11 via a bearing 22 and meshes with a small gear 19a. A large gear 23 is fitted to the rear wheel shaft 11 and rotatably supported via balls 24. An output shaft cylinder having a driven sprocket 6 fixedly mounted on one end thereof, and 25 is formed by a claw 21a provided at one end of the buzz portion of the large gear 21 and an inner claw wheel 23a provided at one end of the output shaft cylinder 23. The one-way claw clutch 26 is a hub that is serrated to the output shaft cylinder 23. The hub 26 has a cylindrical portion 26a that serves as an outer cylinder of the brake and a cylindrical driving friction wheel 26b of the starter.

Reference numeral 27 is an expandable brake shoe, 28 is a band-shaped spoke connecting the hub 26 and the rim of the rear wheel 3, and the spoke 28 is formed in a funnel shape. The gear case 14 has one end rotatably fitted to and supported by the rear wheel shaft 11 via the bearing 29 and the output shaft cylinder 23 via the bearing 30, and the other end fixed to the rear fork 2 by a mounting bracket (not shown). It is designed so that it will not rotate due to the reaction force during driving.

Reference numeral 31 is a driven friction wheel which is externally fitted to one end of the crankshaft 15 protruding from the gear case 14 via a one-way (roller) clutch 32, and 33 is a shifting friction wheel, the details of which are shown in FIG. In FIGS. 4 to 6, 34 is the gear case 1.
A pulling lever 36 pivotally supported by a pin 35 fixedly mounted at 4 is rotatably supported at one end of a pulling lever 34 by a pin 37, and normally the end face is pushed by a leaf spring 38 to push the pulling lever 34. Reference numeral 39 denotes a cantilever pin which is held at a right angle to the supporting piece 36 and which is fixed to the supporting piece 36 and rotatably and axially supports the friction wheel 33.

Reference numeral 40 denotes a tension spring for biasing the shifting lever 34, one end of which is fixed to the gear case 14, in the counterclockwise direction in FIG. 4, and 41 and 41a are stopped at one end of the shifting lever 34, and are moved by the operation of the starter lever 9. The Bowden rope and the Bowden rope terminal piece for swinging the lever 34, 42 is a guide tube of the Bowden rope 41 whose end is stopped by the gear case 14, and 33a (FIG. 6) is a pulling friction wheel 3 for increasing friction.
3 is a hard rubber tube that is fixed to the outer peripheral surface. The members form the shifting mechanism 43. The drive friction wheel 2 is shown in FIG.
6b, driven friction wheel 31, crankshaft 15, intermediate shaft 19,
The rear wheel shaft 11 is shown by a two-dot chain line.

The operation of the first embodiment will be described. The pulling lever 34 is always pulled by the spring 40, and the pulling friction wheel 33 is separated from the driving friction wheel 26b and the driven friction wheel 31. When driving manually, the driving torque generated on the pedal shaft (pedal crankshaft) when the pedal 4 is depressed is transmitted to the rear wheel 3 through the driving sprocket 5, the chain 7 and the driven sprocket 6 as in a general bicycle. . The driving force due to human power is interrupted by the one-way claw clutch 25 between the output shaft cylinder 23 and the large gear 21 and is not transmitted to the speed reducer side. The rotational force input from the rear wheel 3 side during coasting is transmitted to the driven sprocket 6. The mounted one-way claw clutch disconnects from the pedal 4 side and the one-way claw clutch 25 from the speed reducer side.

In the case of power running, the pedal 4 is stepped on as in the case of human power running, and when the starter lever 9 is pulled when the speed is obtained, the pulling lever 34 causes the Bowden cable 41 to move.
And is swung in the clockwise direction in the figure against the force of the spring 40, and the pulling friction wheel 33 resists the force of the leaf spring 38.
The pin 37 of No. 6 swings around the shaft to contact both the driving friction wheel 26b and the driven friction wheel 31, and the rotational force due to the inertia of the driving friction wheel 26b causes the shifting friction wheel 33, the driven friction wheel 31, and the one-way roller clutch. It is transmitted to the crankshaft via 32 and turns to start the engine. Release the starter lever 9 when the engine starts. Then, the biasing force of the spring 40 causes the pulling lever 34 to swing counterclockwise, so that the pulling friction wheel 33 is separated from the driving friction wheel 26b and the driven friction wheel 31. The engine rotates idling. If the rotational speed of the engine is increased, the centrifugal automatic clutch 16 is engaged, and the rotational force of the engine is transmitted to the rear wheels via the reduction gear and drives the rear wheels.

Since the shifting friction wheel 33 can swing its head in the direction perpendicular to the moving direction, it can contact both the driving friction wheel 26b and the driven friction wheel 31 with equal pressure, and the shifting friction wheel When the wheels 33 are brought into contact with each other, the frictional forces received from the friction wheels 26b and 31 are of a summing type acting in the pulling direction. Therefore, the force for operating the starter lever 9 is reduced, and the stumbling causes a large impact load at the time of connection. Does not occur.

[0021]

INDUSTRIAL APPLICABILITY The present invention is a power plant of a type directly connected to a rear wheel of a motorized bicycle, in which the engine can be started without causing an impact load while manually driving the motorized bicycle and the structure is simple. It is possible to provide a starting device that is low in cost and that can determine the pedaling force by using an appropriate power ratio for starting without being restricted by the reduction ratio of the speed reducer for traveling.

[Brief description of drawings]

FIG. 1 is a schematic left side view of a motorbike equipped with a power unit having a starter according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a main portion of the power plant according to the first embodiment of the present invention.

FIG. 4 is a sectional view of the starting device of the first embodiment according to the present invention.

FIG. 5 is a view on arrow B of FIG.

FIG. 6 is a view on arrow C of FIG.

[Explanation of symbols]

3 ... rear wheel, 4 ... pedal, 14 ... gear case, 15 ... crankshaft, 26b ... driving friction wheel, 31 ... driven friction wheel, 32
... one-way clutch, 33 ... shifting friction wheel, 34 ... shifting lever, 35 ... pin, 36 ... support piece, 37 ... pin, 38 ... leaf spring, 39 ... cantilever pin, 40 ... spring, 43 ... shifting mechanism.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuyuki Uenoyama, Kazuyuki Uenoyama, No. 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya, Aichi Mitsubishi Heavy Industries, Ltd. Nagoya Machinery Works (72) Kenji Yamazaki 399, Matsunagacho, Fukuyama-shi, Hiroshima No. 49 Stock Company Yamazaki Factory

Claims (3)

[Claims] 1. A bicycle with a motor, in which a power unit (10) in which an engine and a speed reducer are combined in one case is mounted on a rear wheel (3), and can be manually driven by a pedal (4) and powered by an engine. In the power plant of the above, the drive friction wheel (26b) fixed concentrically with the rear wheel (3) and the engine crankshaft (15) protruding outside the case are concentrically mounted via the one-way clutch (32). Driven friction wheel (3
1), an approaching friction wheel (33) provided so that the driving friction wheel can contact the driven friction wheel, and the driving friction wheel and the driven friction wheel are supported and swung. A starting device for a motor-operated bicycle, comprising: a pulling mechanism (43) capable of contacting or separating. 2. The wobbling type wherein the friction wheel is swingable in a direction perpendicular to the moving direction and frictional force received from driving and driven friction wheels acts in the pulling direction.
Starting device for a bicycle with a motor as described. 3. The prime mover according to claim 1, wherein the pulling mechanism includes a spring that biases the pulling friction wheel to a non-contact position, and a starter lever that swings the pulling friction wheel against the spring. Bicycle starting device.