JPH0524572A - Bicycle - Google Patents

Abstract

PURPOSE:To make a bicycle compact and to improve its travelling stability. CONSTITUTION:A front wheel 2 and a rear wheel 3 are held through bearings on a plural number of points of a main body frame 1 and arranged in parallel as parts of them are overlapped in the longitudinal direction. A drive part with a transmission wheel 6 the outer periphery of which makes contact with at least one of the inner peripheries of the front wheel 2 and the rear wheel 3 at the overlapped part. Consequently, it comes to be possible to shorten wheel base between the front wheel 2 and the rear wheel 3 and to increase diameters of the front wheel 2 and the rear wheel 3, and accordingly, it is possible to make a bicycle compact and to improve travel stability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-wheeled vehicle such as a manually driven bicycle and a bicycle with a driving mechanism.

[0002]

2. Description of the Related Art Bicycles as shown in FIGS. 8 and 9 have been generally known. This bicycle has a main body frame 20 formed of a pipe, and the main body frame 2
On the front side of 0, there is provided a bifurcated hawk 22 that is integrally connected to the rotation shaft of the handle 21 and extends downward and forward. The tip of the hawk 22 has both ends of its rotation shaft. A front wheel 23 supported by a hawk 22 is rotatably attached. On the other hand, on the rear side of the main body frame 20, a rear wheel 24, which is spaced apart from the front wheel 23 in the front-rear direction and arranged in a straight line with the front wheel 23, is provided on the main body frame 20 in which both ends of its rotation shaft are bifurcated. It is rotatably mounted on a bearing. A front gear 26 is coaxially arranged between the front wheel 23 and the rear wheel 24 on a drive shaft rotated by the left and right pedals 25.
A chain 28 is installed between 3 and a rear gear 27 provided on the rotary shaft of the rear wheel 24.

In this bicycle, when a passenger who rides on the saddle 29 depresses both pedals 25 with both feet to rotate the drive shaft, the rotational force of the bicycle drives the front gear 26 to the chain 28 and the rear gear 27. It is transmitted to the rear wheel 24 via the rear wheel 24, and the rear wheel 24 rotates to travel.

[0004]

By the way, in the above-mentioned conventional bicycle, since the pedal 25, the front gear 26 and the like, which are the driving portions, are arranged between the front wheel 23 and the rear wheel 24, the structure thereof is There is a limit to how short the wheelbase can be. Therefore, there is a limit to the reduction of the total length, and it is difficult to make it compact. Further, when the wheel base and the total length are shortened by reducing the diameters of the front wheels 23 and the rear wheels 24, there arises a problem that the running stability is deteriorated.

The present invention has been devised in view of the above circumstances, and an object to be solved is to make it possible to achieve compactness and improvement of running stability in a two-wheeled vehicle.

[0006]

In order to solve the above problems, a first aspect of the present invention is directed to a main body frame and a plurality of main body frames which are held via bearings, and are partially overlapped in the front-rear direction in parallel. Are arranged between the front wheels and the rear wheels arranged in a shape, and the inner peripheral surfaces of the front wheels and the rear wheels that are opposed to each other in the front-rear direction at the overlapping portions, and are provided on at least one of the inner peripheral surfaces of the front wheels and the rear wheels. A novel configuration is adopted in which a transmission wheel to be engaged is provided, and a drive unit that rotates the front wheel and the rear wheel by rotationally driving the transmission wheel is provided.

According to a second aspect of the present invention, the front wheels and the rear wheels according to the first aspect of the invention have a maximum ground contact diameter toward the inner side in the width direction,
It adopts a new configuration in which the diameter is reduced to the outside.

[0008]

In the two-wheeled vehicle of the present invention, the drive portions for driving at least one of the front wheels and the rear wheels are arranged in the front and rear wheels at the overlapping portions in the front-rear direction. As a result, the wheel bases of the front wheels and the rear wheels are shortened and the size can be reduced. Further, since the wheel base is shortened, the diameters of the front wheels and the rear wheels can be increased, and good traveling stability can be ensured.

When the maximum ground contact diameters of the front wheels and the rear wheels are formed on the inner side in the width direction, the ground contact portions of the front wheels and the rear wheels approach the center line of the vehicle body, respectively, so that the front wheels and the rear wheels are arranged in parallel. Alleviates the discomfort that is arranged in a shape. Further, when the vehicle body is tilted in the left-right direction during traveling, a difference occurs in the ground contact diameter of the front wheels and the rear wheels, that is, the peripheral speed, so that the two-wheeled vehicle can turn in the tilting direction.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. A side view of the motorcycle according to the present embodiment is shown in FIG. 1, a front view thereof is shown in FIG. 2, a plan view thereof is shown in FIG.
A cross-sectional view of a portion along the line IV-IV is shown in FIG.
FIG. 5 shows a sectional view of a portion along the line V, and FIG. 6 shows an exploded perspective view of a portion corresponding to FIG.

In the drawings, reference numeral 1 denotes a dome-shaped main body frame which is open at the lower side and extends in the front-rear direction, and side frames 11 which are curved and hang down in a tapered shape are integrally formed at the central portions of both sides thereof. Has been done. A saddle 1 on which an occupant sits is provided on the upper surface of the main body frame 1 substantially in the center thereof.
2 is formed, and a pair of handles 13 that bend forward and extend in the horizontal direction are attached to both front side portions thereof.

Inside the body frame 1, front wheels 2 and rear wheels 3 are arranged side by side in a partially overlapping manner in the front-rear direction, and the ground contact diameter gradually increases from the inner side to the outer side in the width direction. It is formed to have a reduced diameter. The front wheel 2 and the rear wheel 3 are held at a plurality of positions on the main body frame 1 while being sandwiched by three bearings 15 that are in contact with the inner peripheral surface, the outer peripheral surface and the side surface of the front wheel 2 and the rear wheel 3, respectively.

An elongated hole 16 extending in the vertical direction is formed at the center of each side frame 11, and the drive shaft 4 rotatably held by a pair of holding rods 7 described later has both ends elongated. It is fitted in the hole 16 and is arranged so as to be vertically movable. At the left and right ends of the drive shaft 4 protruding outside the side frame 11, disc-shaped pedal plates 5 are respectively provided.
Are coaxially fixed, and each pedal plate 5 is integrally provided with a pedal 51 projecting outward in the left and right directions at a position symmetrical with respect to the drive shaft 4. Also, the drive shaft 4
Two disc-shaped transmission wheels 6 arranged in parallel inside the side frame 11 are coaxially fixed to each other via a one-way clutch 61. Both transmission vehicles 6
It has a width almost equal to the width of the inner peripheral surface of the front wheel 2 and the rear wheel 3,
The outer peripheral surface portion is made of a hard rubber material having a large friction coefficient. The outer peripheral surface of one transmission wheel 6 is in contact with the inner peripheral surface of the front wheel 2, and the outer peripheral surface of the other transmission wheel 6 is in contact with the inner peripheral surface of the rear wheel 3. The one-way clutch 61
Is configured to transmit the rotational force to the transmission wheel 6 only when the drive shaft 4 rotates in the forward direction of the two-wheeled vehicle (direction of arrow a in the figure).

The drive unit constructed around the drive shaft 4 as described above is held by a pair of holding rods 7 which rotatably support both ends of the drive shaft 4 via bearings 71 at their lower ends. The upper end of each of the holding rods 7 is linearly held by a holding portion 73 formed on the main body frame 1, and between the holding portion 73 and a stopper 74 provided at a substantially central portion of the holding rod 7. Spring member 7 interposed in the
5 is always urged downward. As a result, both transmission wheels 6 are constantly in pressure contact with the inner peripheral surfaces of the front wheels 2 and the rear wheels 3.

Further, at predetermined positions corresponding to the front wheels 2 and the rear wheels 3 of the body frame 1, a brake pad 17 for pressing the front wheels 2 and the rear wheels 3 from both sides to stop the rotation of the wheels.
And a brake lever 18 for operating each brake pad 17 via a wire (not shown) is attached to the left and right handles 13. The two-wheeled vehicle of the present embodiment configured as described above is used as follows. The passenger straddles the saddle 12 and alternately depresses each pedal 51 forward with both feet to rotate the pedal plate 5. As a result, the drive shaft 4 rotates and both transmission wheels 6
Is rotated, and the rotational force is transmitted to the front wheels 2 and the rear wheels 3 that are in contact with the outer peripheral surfaces of the two transmission wheels 6, and the front wheels 2 and the rear wheels 3 rotate in the same direction as the two transmission wheels 6, thereby the two-wheeled vehicle. Runs forward. When the vehicle body is tilted during traveling, a difference in contact diameter between the front wheels 2 and the rear wheels 3 occurs depending on the tilt angle, and this causes the two-wheeled vehicle to turn to the tilt side with a difference in peripheral speed.

When the depression of each pedal 51 is stopped during traveling, the rotational force transmitted from the rotating front wheel 2 and rear wheel 3 to the transmission wheel 6 is not transmitted to the drive shaft 4 by the one-way clutch 61. , The two-wheeled vehicle runs forward as it is due to inertia. As described above, according to the two-wheeled vehicle of this embodiment, the front wheels 2 and the rear wheels 3 are arranged in parallel so as to partially overlap in the front-rear direction, and the drive wheel 6 and the like are arranged in the overlapping portions. Since the parts are provided, the wheel bases of the front wheels 2 and the rear wheels 3 can be shortened to achieve compactness. This makes it possible to reduce the parking space and reduce the weight.

Further, since the wheel base is shortened, the diameters of the front wheels 2 and the rear wheels 3 can be increased correspondingly, so that the running stability can be improved. And front wheel 2
Since the maximum contact diameter of the rear wheel 3 is formed closer to the inner side in the axial direction, the contact portions of the rear wheel 3 approach the center line of the vehicle body, and the front wheel 2 and the rear wheel 3 are arranged in parallel. Can be alleviated, and further, by tilting the vehicle body in the left-right direction during traveling, the two-wheeled vehicle can turn in the tilting side direction.

The two-wheeled vehicle of the above embodiment is constructed so that both the front wheels 2 and the rear wheels 3 are driven by providing two transmission wheels 6, but as shown in FIG.
Only one of the front wheel 2 and the rear wheel 3 may be driven by one transmission wheel 6. FIG. 7 shows the case where only the rear wheel 3 is driven. In this case, the elongated hole 16 of the side frame 11 is formed to be long in the lateral direction so that the drive shaft 4 is movable in the lateral direction. The shaft 4 is attached to the spring member 71.
The holding rod 7 which is pressed by the urging force of is arranged laterally. With this configuration, the front wheels 2 and the rear wheels 3
It is possible to further shorten the wheel base of.

Further, in the above-described embodiment, the structure in which the transmission wheel 6 is substantially a friction wheel has been described, but it may be replaced with a gear transmission method by meshing the internal and external gears. Further, in the two-wheeled vehicle of the above embodiment, the occupant turns both pedals 51 to drive the drive shaft 4, but the present invention is also applied to a two-wheeled vehicle in which the drive shaft 4 is driven by a driving machine such as a motor. be able to.

[0020]

According to the present invention, the main body frame and a plurality of portions of the main body frame are held via bearings,
The front wheels and the rear wheels, which are partially overlapped in the front-rear direction and are arranged in parallel, and the front wheels and the rear wheels, which are disposed between the inner circumferential surfaces facing each other in the front-rear direction at the overlapping portions of the front wheels and the rear wheels, And a transmission wheel engaging with at least one inner peripheral surface of the rear wheel,
Since the drive unit is configured to include a drive unit that rotates the front wheels and the rear wheels by the rotational drive of the transmission vehicle, the wheelbases of the front wheels and the rear wheels are shortened, thereby achieving compactness and improving traveling stability. it can.

Further, by configuring the maximum ground contact diameters of the front wheels and the rear wheels to be closer to the inner side in the width direction, it is possible to alleviate the uncomfortable feeling that the front wheels and the rear wheels are arranged side by side and to drive the vehicle. By tilting the motorcycle inside, it becomes possible to turn in the tilting direction.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle according to an embodiment.

FIG. 2 is a front view of the motorcycle according to the embodiment.

FIG. 3 is a plan view of the motorcycle according to the embodiment.

FIG. 4 is a sectional view of a portion taken along the line IV-IV in FIG.

5 is a cross-sectional view of a portion taken along the line VV of FIG.

FIG. 6 is an exploded perspective view of a portion corresponding to FIG.

FIG. 7 is a side view of a motorcycle according to another embodiment.

FIG. 8 is a side view of a conventional motorcycle.

FIG. 9 is a plan view of a conventional motorcycle.

[Explanation of symbols]

1 ... Main body frame 2 ... Front wheel 3 ... Rear wheel 4 ... Drive shaft 6 ... Transmission wheel 15 ... Bearing

Claims (2)

[Claims] 1. A main body frame, front wheels and rear wheels, which are held in a plurality of places of the main body frame via bearings and are arranged in parallel in a partially overlapping manner in the front-rear direction, and the front wheels and rear wheels. Has a transmission wheel that is disposed between the inner circumferential surfaces that face each other in the front-rear direction at the overlapping portion of and that engages with the inner circumferential surface of at least one of the front wheel and the rear wheel. A two-wheeled vehicle comprising: a drive unit that rotates a front wheel and a rear wheel. 2. The two-wheeled vehicle according to claim 1, wherein the front wheel and the rear wheel have a maximum ground contact diameter on the inner side in the width direction and are reduced toward the outer side.