JPH07125674A - Power plant for bicycle with prime mover - Google Patents

Abstract

PURPOSE:To provide a power plant applicable to the wheel of either of a manual type and a pedal start type bicycle by having a free-wheel insertedly provided between a wheel hub which is rotatably supported on a rear wheel shaft through a bearing and a driven sprocket. CONSTITUTION:When a pedal 104 is pressed down without other operation, rotary drive is caused on a.pedal crank shaft 106 by a pedal crank 105, and transmitted to a driven sprocket 108 and further to a wheel hub 630 through a free-wheel 632 to rotate a rear wheel 103 for running it. In this case, a rear wheel shaft 601, therefore the second reduction shaft 520, rotates with the driven sprocket 108, but since the rotation of the shaft 601 is cut off by an one-way clutch, a large spur wheel 521 does not rotate. When a bicycle with a prime mover runs by inertia, the wheel hub 630 rotates with the rear wheel 103, and the said rotation is cut off by a free-wheel one-way clutch 632, and does not transmit to the driven sprocket 108. Thus the bicycle with a prime mover can run by inertia as the pedal crank 105 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit for a motor-powered bicycle which has an engine mounted on the body of a bicycle and can be driven manually and powered by the engine.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 59-45281 has been proposed as a conventional example of a motorized bicycle in which an engine is arranged near the rear wheel shaft.

[0003]

In the conventional example, the engine is arranged in the vicinity of the rear wheel shaft, the case of the power unit is incorporated into the frame structure of the bicycle, and the power assists the traveling only when the kick starter is provided and the pedal is depressed. It is a high-quality bicycle with a prime mover. On the other hand, this type of motorized bicycle has a persistent need for a simple structure and low cost. SUMMARY OF THE INVENTION An object of the present invention is to provide a low-priced power plant for a prime mover which is mounted on a bicycle wheel and can be applied to both a manual type and a pedal starting type.

[0004]

In the case of the method of starting the engine by hand of the first invention (hereinafter referred to as the manual start type), it is a power unit for a motor-powered bicycle that can be driven manually and driven by power. Engine 300 having the manual starters 314 and 315, the crankshafts of which are placed parallel to the left and right symmetrical planes of the bicycle body, and the crankshaft 311 of the engine.
Centrifugal automatic clutch 410 directly connected to, and at least one set of bevel gears 415 and 511 and one set of spur gears 512 and 52.
1, through which a speed reducer 500 that performs axial conversion and deceleration and outputs, and a wheel hub 630 of the rear wheel 103 are penetrated, one end is directly connected to the output shaft of the speed reducer 500, and the driven sprocket 108 is fixed to the other end. Bearing unit 610, 62
It is interposed between a rear wheel shaft 601 which is rotatably attached to the bicycle body 91 via 0, an output shaft 520 of the speed reducer, and a large spur gear 521 for speed reduction fitted on the output shaft. A one-way clutch 522, and a free wheel 632 interposed between the wheel hub 630 rotatably supported on the rear wheel shaft 601 via bearings 610 and 620 and the driven sprocket 108. It is characterized by becoming.

A method of starting an engine by depressing a pedal of the second invention (hereinafter, referred to as a pedal starting method is a power unit for a motor-operated bicycle which is capable of manual driving and engine-driven driving, and includes a crankshaft. An engine 300 in which is placed parallel to the left and right symmetry planes of the bicycle body, and a centrifugal automatic clutch 410 that is directly connected to the crankshaft 311 of the engine and has a one-way clutch 418 between the input shaft and the output shaft. , At least one set of bevel gears 415, 513 and one set of spur gears 512, 521 performs reduction and output by performing axial conversion and deceleration, and a wheel hub 630 of the rear wheel 103, and one end of which is described above. The bicycle body 9 is directly connected to the output shaft of the speed reducer 500, and the driven sprocket 108 is fixed to the other end of the reducer 500 so as to be rotatable via bearing units 610 and 620.
1, a rear wheel shaft 601 attached to the vehicle 1, and the speed reducer 500.
One-way clutch 522 interposed between the output shaft 520 of the vehicle and the large spur gear 521 for reduction mounted on the output shaft.
And the large spur gear 52 by means of a manual clutch shifter 529 which is formed between the output shaft 520 and the large spur gear 521 and engages with an annular groove 521b provided in the large spur gear 521.
1 is slid in the axial direction to engage and disengage the meshing clutch 528, and the rear wheel shaft 601 has bearings 610,
The wheel hub 630 is rotatably supported via the 620, and the free wheel 632 is interposed between the driven sprocket 108 and the sprocket 108.

[0006]

In the case of the manual start type, when a pedal is depressed, a rotational driving force is generated on the driving sprocket by the pedal crank, and this rotational driving force is transmitted to the chain, the driven sprocket, the free wheel and the wheel hub to drive the rear wheels to drive. . Transmission of the rotational driving force to the engine side is blocked by a one-way clutch 522 interposed between the output shaft of the reduction gear and the large spur gear. When driving manually, the engine can be started manually, and then the throttle can be opened to increase the engine speed.The centrifugal automatic clutch can be engaged at a certain speed and the engine speed can be reduced by the reducer. Then, the rotational driving force is transmitted to the wheel hub via the rear wheel shaft, and the rear wheel is driven to travel as in the case of the human power traveling.
Transmission of the rotational driving force to the pedal side is blocked by the freewheel.

When the pedal-driven type is used for manual driving, it can be driven manually by stepping on the pedal as in the manual-driven type. When the vehicle is powered by a pedal-starting type, when the starter lever is pulled, the dog clutch is connected and the output shaft of the reduction gear engages with the large spur gear fitted thereto. Next, when the pedal is depressed, the vehicle travels in the same way as in the case of the human power traveling, and the rotational driving force is transmitted to the large spur gear through the meshing clutch, and then the one-way clutch 41 interposed in the centrifugal automatic clutch.
It is transmitted to the crankshaft of the engine through 8 and rotates the crankshaft to start the engine. When the engine starts moving, the rotational speed of the input shaft of the centrifugal automatic clutch increases and the one-way clutch is disengaged. Here, when the starter lever is returned, the meshing clutch is disengaged, and then when the throttle is opened, the rotation of the engine becomes faster and the centrifugal automatic clutch is connected at a certain speed and the crankshaft is connected to the speed reducer,
The engine is decelerated and transmitted to the rear wheel shafts, and becomes in a state similar to the power running in the manual start type.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the first invention is shown in FIGS.
5 will be described. 1 is a left side view of a motorized bicycle equipped with the power unit of the embodiment, FIG. 2 is a side view of the power unit of the embodiment, and FIG. 3 is an arrow A in FIG. 2 of the manually started power unit of the first embodiment. FIG. 5 is a perspective view of a rear wheel shaft right end mounting portion of the embodiment. In the figure, reference numeral 91 is a vehicle body frame of a motorbike, and 92 is a head tube, which is the foremost portion of the vehicle body. A front fork 93 is fitted in the head tube 92 to support the front wheel. Reference numeral 102 denotes a front wheel, the wheel hub of which is supported by a front fork 93. An upper tube 94 is fixed to the head tube 92. A lower tube 95 is fixed to the head tube 93 below the upper tube 94. 9
A seat post frame 6 is fixed to the upper tube 94 and the lower tube 95, and the seat 101 is attached to the upper end thereof.

Reference numeral 97 denotes a rear fork which is bifurcated and has its front end fixed to the lower end of the seat post claim 96. There are two back stays 98 on the left and right, which are fixed to the rear end of the rear fork 97 and the upper end of the seat post frame 96. Reference numeral 99 denotes a bracket which is provided at a connecting portion between the rear fork 97 and the back stay 98.
The details are shown in. Reference numeral 100 denotes a steering wheel mounted on the front fork. A front wheel 102 has a wheel hub rotatably supported by a front fork. Reference numeral 103 denotes a rear wheel, the wheel hub of which is supported by the rear wheel shaft. Reference numeral 104 is a pedal, 105 is a pedal crank, and the pedal 104 is vertically attached to the end. Reference numeral 106 denotes a pedal crank shaft, which is supported by bearings perpendicular to a plane including the lower tube and the seat post frame via a bearing, and pedal cranks 105 are vertically attached to the left and right ends thereof. 107 is a drive sprocket and a pedal crankshaft 10
It is attached to the pedal crank 105 on the right side of 6 via a free wheel (not shown). A driven sprocket 108 is attached to the rear wheel shaft.

A chain 109 is a drive sprocket 10.
7 and the driven sprocket 108.
A power unit 200 is attached to the left backstay 98. A throttle grip 201 is provided on the steering handle 100. A starter lever 202 is provided on the steering wheel. 203
Is a fuel tank provided after the seat 101. Three
A starter grip 15 is provided on the upper portion of the power unit 200. The power unit 200 includes an engine, a clutch, a speed reducer, and an axle portion, and is housed in a separable one-body casing. 300 is an engine part and a power unit 200 is provided at the end.
An attachment arm 220 for attaching the to the vehicle body is provided. 221 is a band for attaching the attachment arm 220 to the back stay 98. Reference numeral 210 denotes a casing, which houses the axle portion and the speed reducer portion and is connected to a crankcase. A clutch unit 400 is connected to the engine unit 300. Fifty
Reference numeral 0 denotes a speed reducer unit which is connected to the clutch unit 400. 6
Reference numeral 00 denotes an axle portion which is connected to the speed reducer portion 500.

Reference numeral 310 denotes an engine body, which has a normal structure. Reference numeral 311 denotes a crankshaft, which is a known element of an engine and is arranged in parallel to the left and right symmetry planes of the body frame of the motorbike, and its end portion is shown. 312 is a vaporizer,
313 is an air cleaner, 314 is a recoil starter, 3
A starter grip 15 is a known element of the engine. An extension shaft 401 is connected to the crank shaft 311 by a taper shaft. Reference numeral 402 denotes a bolt that pushes the tapered hole of the extension shaft 401 into the taper of the crankshaft. 410
Is a centrifugal automatic clutch. An inner rotor 411 is attached to the extension shaft 401. A contact piece 412 is pin-coupled to the inner rotor 411 with its center of gravity removed. An outer rotor 413 has a trough shape provided outside the contact piece 412. A small bevel gear shaft 414 is fixed to the center of the outer rotor 410 to form the shaft. Four
A small bevel gear 15 is attached to the end of the small bevel gear shaft 414. Reference numeral 416 denotes a bearing, and two ball bearings are arranged in series to support the bevel gear shaft 415.

Reference numeral 510 denotes a first reduction shaft, which is supported by the casing 210 perpendicularly to the bevel gear shaft 414 via a bearing. A large bevel gear 511 is fixed to the first reduction shaft 510 and meshes with the small bevel gear 415. There are two bearings 513, the first
Supports the reduction shaft 510. The second reduction shaft 520 is hollow and has a tapered hole at the end, and is supported by the casing 210 in parallel with the first reduction shaft 510 via a bearing. A small spur gear 512 is provided on the first reduction shaft 510. 521
Is a large spur gear and is attached to the second reduction shaft 520 via a one-way clutch 522, and meshes with the small spur gear 512. 523
A pair of bearings is provided on the casing 210 to support the second reduction shaft 520. A bolt 524 penetrates the second reduction shaft 520. 525 is a cap 210
The end of the second reduction shaft 520 provided on the above is closed.

A rear wheel shaft 601 is drawn into the taper hole of the second reduction shaft 520 with a bolt 524. A right bearing unit 610 supports the right end of the rear wheel shaft 601. 620
The left bearing unit supports the left side of the rear wheel shaft 601. 6
A rear wheel hub 30 is supported by a rear wheel shaft 601 via a bearing. Two bearings 631 are provided on the rear wheel shaft and support the rear wheel hub 630. The driven sprocket 108
Is screwed near the right end of the rear wheel shaft 601 and is connected to the rear wheel hub 630 via a free wheel (one-way clutch) 632. The right bearing unit 610 is a bearing 61.
As shown in FIG. 5, an end portion 612a, which is composed of a housing 612 and a cap 613, and which is left in the housing 612 with two planes that are symmetric with respect to the axis, is fitted to the lid or the portion of the bracket 99, and is inserted through a washer 614. It is fastened to the bracket 99 by a nut 615. 61
Reference numeral 2b is a threaded rod provided at the right end of the housing 612 and fitted with a nut 615. Reference numeral 614 is a chain pull and is screwed after the housing 612. The left bearing unit 620 has a structure similar to that of the right bearing unit 610.
Housing 622 Cap consists of housing 622
There is a through hole in the rear wheel shaft 601 and there is no chain pulling. 109 is a chain, and the driven sprocket 108 is
It is wound around the drive sprocket 107.

The operation of the first embodiment of the first invention will be described. When the pedal 104 is depressed without any operation, the pedal crank 105 causes rotational movement of the pedal crank shaft 106, which is transmitted to the driven sprocket 108 via the drive sprocket 107 and the chain 109 and further to the wheel hub 630 through the free wheel 632. After being transmitted, the rear wheels 103 are rotated to run. At this time, the rear wheel shaft 601 and thus the second reduction shaft 52 together with the driven sprocket 108.
Although 0 rotates, the rotation is blocked by the one-way clutch 522 and the large spur gear 521 does not rotate. When the motorized bicycle runs by inertia, the wheel hub 630 rotates together with the rear wheel 103, and the rotation of the wheel hub 630 causes the freewheel one-way clutch 6 to rotate.
32 is blocked and does not reach the driven sprocket 108.
Therefore, it is possible to run by inertia with the pedal crank 105 stopped.

In the case of traveling with power, when the starter grip 315 is pulled by hand, the engine 300 starts and rotates with no load. Next, when the throttle grip 201 is rotated, the rotation of the engine becomes faster, the rotation of the inner rotor 411 becomes faster, and the contact piece 412 is centrifugally rotated at a certain rotation speed by the outer rotor 413.
The centrifugal automatic clutch 410 is connected to the speed reducer unit 500 by pressure contact with the rotation of the small bevel gear 415 and the large bevel gear 513.
The rotation is transmitted to the first reduction shaft 510 by the small spur gear 512 and the large spur gear 521, and the rotation is transmitted to the second reduction shaft 520 via the free wheel 522. After that, it is transmitted to the rear wheels 103 in the same manner as in the case of the manual driving. At this time, the rotational driving force of the engine is blocked by the freewheel and is not transmitted to the pedal 104, and even if the rotational driving force from the driven sprocket 108 is generated, it is blocked by the one-way clutch 522 and transmitted to the engine side. Absent. Therefore, the pedal 104 can be freely used under the same conditions as when the engine is not used.

A second embodiment of the second invention is shown in FIGS.
This will be described with reference to 4 and 5. FIGS. 1, 2 and 5 have been described in the first embodiment in common with the first embodiment, and therefore only different points will be described without being repeated. The recoil starter is not attached to the engine 300. In the centrifugal automatic clutch, reference numeral 401 denotes an extension shaft, which is longer than the counterpart of the first embodiment. An inner rotor 412 is fixed to the extension shaft 401. A sleeve 417 is screwed to the extension shaft 401. Numeral 402 is a bolt that penetrates the extension shaft 401 to fasten the sleeve 417 and the extension shaft 401 to the crankshaft 311. A one-way clutch 418 is interposed between the sleeve 417 and the small bevel gear 414. A sleeve 527 has a flange and is screwed to the second reduction shaft 520. 5
27a is a claw for engagement and is provided on the back side of the flange of the sleeve 527. 521a is a large spur gear 521
Is provided on the end surface of the boss so as to face the claw 527a. An annular groove 521b is provided on the outer periphery of the boss of the large spur gear 521.

522 is a one-way clutch, which is a large spur gear 521.
The large spur gear 521 provided between the sleeve and the sleeve 527 is slidable in the axial direction. Reference numeral 530 denotes a swing shaft for the casing 21.
It is set to 0. Reference numeral 531 is a pin that is eccentrically attached to the inner end surface of the swing shaft 530 and is loosely fitted in the annular groove 521b. 529 is the end ring 53 with clutch
2, consisting of a swing shaft 530 and a pin 531. An end ring 532 is attached to the outer end of the swing shaft 530. 532a is an arm and is provided on the end ring 532. Reference numeral 533 denotes a Bowden cable attachment which is a two-pronged joint and is pin-connected to the arm 532a.

The operation of the second embodiment of the second invention will be described. The manpower running is the same as in the first embodiment. When the starter lever 202 is pulled, the clutch shifting 529 causes the large spur gear 521 to slide in the axial direction by a Bowden cable (not shown) to engage the meshing clutch 528. Next pedal 10
When stepping on 4 and driving the motorized bicycle, the rear wheel shaft 6
The rotation of 01 passes through the meshing clutch 528 and the large spur gear 5
21 and then to the small bevel gear shaft 414 after being accelerated by the first reduction shaft 510 and further transmitted to the crank shaft 311 through the sleeve 417 and the extension shaft 401 by the one-way clutch 418, and the engine 310 is rotated. Will start.

When the engine starts, the starting lever 202 is returned. Then, the dog clutch 528 is disengaged. When the engine 310 starts, the crankshaft 311 and hence the sleeve 4
Since the rotation speed of 17 is faster than that of the small bevel gear shaft 414,
The one-way clutch 418 disengages the engine 3
The rotational driving force of 10 is not transmitted to the reduction gear unit 500. Next, when the throttle grip 201 is turned, the rotation of the engine 310 becomes faster, and the centrifugal automatic clutch 410 is rotated at a certain speed.
Is connected and the rotational driving force is transmitted to the small bevel gear shaft 414, and the following description is omitted because it is the same as the traveling by the engine power of the first embodiment.

[0020]

Since the present invention is constructed as described above, its effects are as follows. (1) Each part of the engine, centrifugal automatic clutch, and speed reducer is housed in one casing, and the output shaft is directly connected to the rear wheel shaft, so it can be easily installed without changing the structure of conventional general bicycles. it can. (2) It can be applied to both a manual starting type and a pedal starting type, and the structure is simple, which can contribute to weight reduction and cost reduction of the device.
In particular, the pedal-starting device has a structure with few additional parts. (3) Since bevel gears and spur gears with little slippage are used as reduction gears, mechanical efficiency is good.

[Brief description of drawings]

FIG. 1 is a left side view of a motorbike equipped with a power unit of the present invention.

FIG. 2 is a side view of the power unit according to the present invention.

FIG. 3 is a cross-sectional view of the manually started power plant of the first embodiment of the first invention as seen in the direction of arrow A in FIG.

FIG. 4 is a sectional view of the pedal-starting type power plant according to the second embodiment of the second aspect of the invention as viewed in the direction of arrow A in FIG.

FIG. 5 is a perspective view of a rear wheel shaft right end mounting portion of the embodiment.

[Explanation of symbols]

91 ... motorcycle bicycle body, 103 ... rear wheel, 107 ...
Drive sprocket, 108 ... Driven sprocket, 200
... power plant, 310 ... engine, 311 ... crankshaft,
314 ... Manual starter (recoil starter) 315 ...
Manual starter grip, 400 ... Clutch, 410 ...
Centrifugal automatic clutch, 414 ... small bevel gear shaft, 417 ... sleeve, 418 ... one-way clutch, 415 ... small bevel gear,
500 ... Reduction gear part, 511 ... Large bevel gear, 512 ... Small spur gear, 521 ... Large spur gear, 510 ... First reduction shaft, 520 ...
Second reduction shaft, 521b ... annular groove, 527 ... sleeve, 5
28 ... engagement clutch, 527a ... claw, 521a ... claw,
529 ... Clutch shift, 600 ... Wheel shaft part, 601 ... Rear wheel shaft, 610 ... Bearing unit, 620 ... Bearing unit, 630 ... Wheel hub, 632 ... Free wheel.

 ─────────────────────────────────────────────────── ─── 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 (2)

[Claims] 1. A power unit of a bicycle with a motor, which is capable of being driven manually and driven by power, and comprising a manual starter (3).
14) (315), an engine (300) having a crankshaft parallel to the left and right symmetry planes of the bicycle body, and a centrifugal automatic clutch (410) directly connected to the crankshaft (311) of the engine, At least one set of bevel gears (41
5) (511) and a set of spur gears (512) and (521) to reduce the speed in the axial direction and reduce and output the speed reduction gear (500), and the wheel hub (63) of the rear wheel (103).
0), one end of which is directly connected to the output shaft of the speed reducer (500) and the other end of which is fitted with a driven sprocket (108), which is rotatably attached to the bicycle body (91) via bearing units (610) (620). A rear wheel shaft (601) attached, a one-way clutch (522) interposed between the output shaft (520) of the reduction gear and a reduction spur gear (521) externally fitted to the output shaft. ), The wheel hub (630) rotatably supported on the rear wheel shaft (601) via bearings (610) (620), and the driven sprocket (1).
08) and a freewheel (632) interposed between the powertrain and the motor. 2. A power unit for a motor-operated bicycle, which can be driven manually and powered by an engine. An engine (300) having a crankshaft parallel to left and right symmetrical planes of a bicycle body, and an engine (300) for the engine. Centrifugal automatic clutch (410) directly connected to the crankshaft (311) and having a one-way clutch (418) interposed between an input shaft and an output shaft
A speed reducer (500) that performs axial conversion and deceleration by at least one set of bevel gears (415) (513) and one set of spur gears (512) (521), and outputs the rear wheel (1).
03) through the wheel hub (630), one end of which is directly connected to the output shaft of the speed reducer (500) and the other end of which is fitted with a driven sprocket (108), and bearing units (610) (62).
0), a rear wheel shaft (601) rotatably attached to the bicycle body (91), an output shaft (520) of the speed reducer (500), and a reduction gear mounted on the output shaft. One-way clutch (5) interposed between the gear (521)
22), the output shaft (520) and the large spur gear (52)
1) a manual clutch shifter (52) that engages with an annular groove (521b) formed in the large spur gear (521).
9) A meshing clutch (528) for sliding the large spur gear (521) in the axial direction to disengage the mesh.
And the bearings (610) (62) on the rear wheel shaft (601).
0) A power plant for a motorized bicycle having a wheel hub (630) rotatably supported via a free wheel (632) interposed between the driven sprocket (108).