JPH07315280A - Bicycle - Google Patents

Abstract

PURPOSE:To surely transmit driving force of a power driving device without complicating any structure. CONSTITUTION:In a bicycle provided with a manual driving device 3, which has a drive transmitting system consisting of chain 33 and the like, and a power driving device 4 consisting of a driving small wheel, which is brought into pressure contact with a wheel 2 and is rotationally driven by a motor mounted in a vehicle body, a transmission unit 5, in which a gear ratio is set to be equal to a rotation ratio between the wheel 2 and a driving small wheel in the power driving device 4, is connected to the driving small wheel, and a chain 33 and the like in the manual driving device 3 is suspended in the transmission unit 5.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a bicycle. More specifically, it relates to an improvement relating to a drive transmission structure of a bicycle including both a human power drive device and a power drive device.

[0002]

2. Description of the Related Art Conventionally, as a bicycle, for example, FIG.
The one shown in FIG. 5 is known.

In this conventional bicycle, a front wheel 1 is a steered wheel and a rear wheel 2 is a drive wheel, and a human power drive device 3 having a rear wheel 2 as a drive source and a power drive device having a power source as a drive source. 4 and 4 are linked.

The human power drive device 3 includes a pedal crank 31 of a foot pedal type, a drive sprocket 32 coaxially fixed to a rotation shaft of the pedal crank 31, and a drive sprocket 32.
And a chain 33 mounted endlessly on the driven sprocket 21 of the rear wheel 2. The chains 33 are roller chains, grooved belts, or the like.

The power drive device 4 is a driving small wheel that is rotationally driven by a prime mover 41 mounted on a vehicle body near the rear wheel 2 and a tread 22 of the rear wheel 2 in pressure contact with the prime mover 41 by a rotary shaft 42. And 43. The prime mover 41 includes a small electric motor, a small gasoline engine, and the like. Further, the driving small wheel 43 is fitted with a wheel 43a fixed to the rotary shaft 42, and a surface material 43b formed in a ring shape with a taper groove made of a material such as rubber having a high friction coefficient and elasticity. It becomes.

In this conventional bicycle, the human power drive device 3,
In order that the power drive device 4 can be selected and traveled, a clutch mechanism or the like is provided between the prime mover 41 and the drive small wheel 43 of the power drive device 4, and when the human power drive device 3 is driven, The drive device 4 may be configured so as not to become a load. Further, the human power drive device 3 may be configured to function only as a starting crank of the power drive device 4.

In such a conventional bicycle, when mud, water, oil or the like adheres to the tread 22 of the rear wheel 2, the surface material 43 of the tread 22 of the rear wheel 2 and the driving small wheel 43 of the power drive unit 4 is used.
There is a problem that the driving force of the power drive device 4 is not reliably transmitted because a slip occurs between the power drive device 4 and b.

As a structure for reliably transmitting the driving force of the power drive device 4, it is conceivable to use various structures adopted in a motorcycle. However, the use of such a structure causes a new problem that the structure of the power drive device 4 becomes complicated and the function as a bicycle is lost.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and provides a bicycle in which the driving force of a power drive device is reliably transmitted without complicating the structure. Is an issue.

[0010]

In order to solve the aforementioned problems, the bicycle according to the present invention employs the following means.

That is, according to the first aspect, in addition to the human-powered drive device having a drive transmission system including chains, there is provided a power drive device including a drive small wheel which is pressed against the wheels and rotationally driven by a prime mover mounted on the vehicle body. In the equipped bicycle, the transmission part, which was set to the same gear ratio as the rotation ratio between the wheels and the small drive wheels of the power drive, was connected to the small drive wheels, and the chains of the human power drive were mounted on the transmission part. It is characterized by

According to a second aspect of the present invention, in the bicycle according to the first aspect, the transmission portion includes a pinion gear coaxially fixed to a driving small wheel of the power drive device, an internal gear meshed with the pinion gear, and an internal gear. It is characterized by comprising a sprocket that is coaxially fixed and on which chains of a human power drive device are mounted.

[0013]

According to the above-mentioned means, in addition to the system in which the drive transmission system of the power drive device is composed of the rear wheels and the driving small wheels, the rear wheels without slippage, the chains, the transmission portion, the driving small wheels are provided. Since the added system has been added, and the added system also serves as a chain that is part of the human-powered drive unit to prevent an increase in the number of members, the drive force of the power drive unit is not complicated. The problem of providing a bicycle with reliable transmission is solved.

According to the second aspect of the present invention, in the operation of the first aspect, the transmission portion, which is relatively large and complicated, is made compact by using the internal gear.

[0015]

EXAMPLES Examples of a bicycle according to the present invention will be described below with reference to FIGS.
A description will be given based on FIG.

In this embodiment, as is apparent from FIG. 1, in addition to the structure of the conventional example described above, a transmission section 5, an idler sprocket 6 and a tension sprocket 7 are added to mount the chains 33 of the human power drive device 3. The rack line has been changed.

The transmission unit 5 is, as shown in detail in FIGS. 2 and 3, the drive small wheel 43 of the power drive unit 4.
To the vehicle body, a support plate 51 fixed to the vehicle body, a pinion gear 52 fixed to the rotary shaft 42 of the power drive device 4 coaxially with the axis line X, a pinion gear 52 and a rotary shaft 42 of the power drive device 4, An attachment 53 that connects the driving small wheel 43 (wheel 43a) and a bearing 54 that is incorporated in the support plate 51 and supports the pinion gear 52.
And an internal gear 55 that meshes with the pinion gear 52.
An internal gear hub 56 fixed to the internal gear 55 coaxially with the axis Y, a bearing 57 incorporated in the support plate 51 to support the internal gear hub 56, and a one-way fixed coaxially to the internal gear hub 56. Clutch 58 and one-way clutch 5
8 and a sprocket 59 coaxially assembled.

The gear ratio between the pinion gear 52 and the internal gear 55 of the transmission unit 5 is set to be the same as the rotation ratio between the drive small wheel 43 and the rear wheel 2 of the power drive device 4.

Further, the one-way clutch 58 of the transmission unit 5 causes high-speed rotation of the prime mover 41 of the power drive unit 4 when the rear wheel 2 rotates at a higher speed than the rotary shaft 42 of the power drive unit 4 on a slope or the like. The structure is such that it does not transmit and damage the prime mover 41. Further, when the rear wheels 2 rotate backward (reverse) and the chains 33 of the human power drive device 3 move in the reverse direction, the reverse rotation of the sprocket 59 is not transmitted to the internal gear hub 56.

As the sprocket 59 of the transmission unit 5, a gear, a sheave or the like is selected according to the structure of the chains 33 of the human power drive device 3. The sprocket 59 is used for the chains 33 of the human power drive device 3.
It is located outside the endless mount.

The idler sprocket 6 is provided close to the sprocket 59 of the transmission section 5 and between the idler sprocket 6 and the drive sprocket 32 of the human-powered drive unit 3, and inside the endless-shaped mounting of the chains 33 of the human-powered drive unit 3. This position prevents the sprocket 59 and the chains 33 from coming off. In addition, this idler sprocket 6
A gear, a sheave, or the like is selected according to the structure of the chains 33 of the human power drive device 3.

Two tension sprockets 7 are provided adjacent to each other between the sprocket 59 of the transmission section 5 and the driven sprocket 21 of the rear wheel 2, and are included in the endless-shaped mounting of the chains 33 of the human power drive device 3. Located on the outside, a tension is applied to the chains 33 in cooperation with a spring or the like (not shown) so that the sprocket 59 and the chains 33 are meshed smoothly and securely. The tension sprocket 7 is selected from gears, sheaves, etc. according to the structure of the chains 33 of the human power drive device 3.

Further, in this embodiment, the human power drive device 3 is used.
The one-way clutch 8 is provided on the drive sprocket 32. In this one-way clutch 8, when the chains 33 of the human-powered drive 3 are moved in the forward direction by the drive of the power-driven drive 4, the normal rotation of the drive sprocket 32 of the human-powered drive 3 causes the pedal crank 31 of the human-powered drive 3 to rotate. It has a structure that does not transmit to.

According to this embodiment, the chains 33 of the human-powered drive 3 which are also provided in the conventional example are directly used for the transmission section 5 only by changing the mounting line. Therefore, the increase in the number of members is prevented,
The structure is not so complicated as compared with the conventional example.

Further, according to this embodiment, the transmission unit 5 newly added to the conventional example is also made compact by using the internal gear 55 and the like, so that it has a volumetric and weight structure as compared with the conventional example. Not upsized.

Further, according to this embodiment, the transmission unit 5 and the like are additionally provided to the human power drive device 3 and the power drive device 4 without changing the structures of the conventional human power drive device 3 and the power drive device 4. Because of the structure, existing products can be easily modified.

Using this embodiment, the power drive 4
By driving the drive small wheel 43 of the power drive device 4.
The drive transmission system that drives the rear wheels 2 by driving the chains 33 of the human-powered drive device 3 can be additionally operated with respect to the drive transmission system that drives the rear wheels 2 by rotating. That is, when the prime mover 41 of the power drive device 4 operates to rotate the rotary shaft 42 and the drive small wheel 43, the pinion gear 52 moves in the same direction as the rotary shaft 42 and the drive small wheel 43 via the attachment 53 of the transmission unit 5. Rotate. Then, the pinion gear 5 of the transmission unit 5
The rotation of 2 rotates the meshing internal gear 55 in the same direction as the pinion gear 52, and further rotates the internal gear hub 56 and the sprocket 59 integrated with the internal gear 55. As a result, the chains 33 of the human power drive device 3 mounted on the sprocket 59 of the transmission unit 5 also move, and the driven sprocket 21 drives the rear wheels 2 to travel.

In the drive system for the rear wheels 2 having the above-described two systems, an unbalanced drive transmission such as knocking does not occur due to the same setting of the gear ratio and the rotation ratio of both systems.

Further, since the drive transmission system newly added in this embodiment does not cause the slip by utilizing the chains 33 of the human power drive device 3, the drive transmission to the rear wheels 2 is surely performed. Be seen. In this drive transmission system, the pinion gear 52 of the transmission unit 5 and the internal gear hub 56 are supported by bearings 54 and 57 incorporated in the support plate 51 fixed to the vehicle body, so that the drive rotation is smooth and reliable. To be done.

Further, the other drive transmission system, which is also provided in the above-mentioned conventional example, has the transmission assisting function of the newly added drive transmission system. The small drive wheels 43 of the power drive device 4 remaining in the drive transmission system facilitate starting when the prime mover 41 of the power drive device 4 is a small gasoline engine or the like.

In addition to the illustrated embodiment, an embodiment in which the front wheel 1 is used as a driving wheel and the human power drive device 3 is of a row type is also possible.

[0032]

As described above, in the bicycle according to the present invention, since the driving force of the power drive device is transmitted even by chains that do not slip, the transmission force of the power drive device can be reliably transmitted. Has the effect of

Further, in common with claims 1 and 2, a drive transmission system also serving as a chain which is a part of the human power drive device is provided to prevent an increase in the number of members, so that the structure is not complicated. There is.

Further, since the structure is such that the power transmission device is additionally provided with the transmission section as in the first and second aspects, it is possible to easily modify the existing product.

Further, according to claim 2, since the transmission portion is made compact by utilizing an internal gear or the like, there is an effect that the structure is not enlarged.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a bicycle according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

3 is a cross-sectional view of FIG.

FIG. 4 is a front view showing a conventional example.

5 is an enlarged cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Front Wheel 2 Rear Wheel 3 Human Power Drive 33 Chains 4 Power Drive 41 Drive Motor 42 Rotation Shaft 43 Drive Small Wheel 5 Transmission 52 Pinion Gear 55 Internal Gear 59 Sprocket

Claims (2)

[Claims] 1. A bicycle equipped with a human-powered drive device having a drive transmission system including chains, and a power drive device including small drive wheels that are pressed against wheels to be rotationally driven by a prime mover mounted on a vehicle body, It is characterized in that the transmission unit, which is set to the same gear ratio as the rotation ratio between the wheels and the drive small wheels of the power drive unit, is connected to the drive small wheels, and the transmission unit is mounted with chains of the human power drive unit. bicycle. 2. The bicycle according to claim 1, wherein the transmission portion is coaxially fixed to a driving small wheel of the power drive device, an internal gear meshed with the pinion gear, and coaxially fixed to the internal gear. A bicycle characterized by comprising a sprocket on which chains of a drive device are mounted.