JP2002308174A - Shaft frame for two-wheeler and two-wheeler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansible shaft frame for a two-wheeler eliminating rattling during traveling. SOLUTION: This shaft frame for two-wheeler connects a front-part frame 1, which is provided with a wheel pedestal 3 supporting a front-wheel support body 9 rotatably retaining the front wheel 5 in the front end, to a rear frame 4 rotatably retaining the rear wheel 6. The front-part frame 1 is provided with the wheel pedestal 3, a rear-part frame fitting part 12, and a shaft body provided between the wheel pedestal and the rear-part frame fitting part. The shaft body is provided with multiple pipe parts which are so disposed and constituted as to enable the telescopic rod type expanding/contracting operation, and an adjustment means adjusting and retaining the longitudinal lengths of the multiple pipes, so that the distance between the saddle and the handle can be set to an optimal position by adjusting the length of the shaft body in getting on the two-wheeler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a shaft frame and a motorcycle. In particular, it relates to a shaft frame of a folding bicycle.

[0002]

2. Description of the Related Art A foldable bicycle can be stored, for example, by folding the bicycle body or expanding the bicycle body in accordance with a use condition. Folding reduces the size, so that there is an advantage that extra space is not required for storage.

[0003] Japanese Utility Model Laid-Open No. 5-1683 discloses a compact bicycle in which a shaft connecting a front wheel and a rear wheel is configured to be able to expand and contract.
The shaft is composed of two cylindrical pipes, one of which is inserted through the other. When using the bicycle, the fittings for tightening the two pipes are loosened to extend the shaft, and the pipes are tightened with the fittings. When the bicycle is stored, the fittings are loosened to contract the shaft. This makes it possible to reduce the size of the bicycle when storing it.

[0004]

In the case of a folding bicycle having a shaft extending / contracting function having such a conventional structure, the metal fittings for tightening the two pipes are loosened due to irregularities on the road surface during running of the bicycle, and the shaft is removed. There was a problem of rattling and noise. If the shaft connecting the front and rear wheels rattled, the entire bicycle fluctuated and running was not stable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shaft frame for a two-wheeled vehicle, which can be adjusted for expansion and contraction and does not rattle during running.

[0006]

In order to achieve the above object, a motorcycle frame according to the present invention comprises a front wheel support for rotatably holding a front wheel, and a handlebar disposed above the front wheel support. A shaft frame for a motorcycle connecting a front frame provided at a front end thereof with a wheel pedestal supporting a steering column having an upper end with a rear frame supporting a rear wheel rotatably and supporting a pedal and a saddle. The front frame includes the wheel pedestal, a rear frame mounting portion connected to the rear frame, and a shaft body provided between the wheel pedestal and the rear frame mounting portion and connecting these. The shaft body is arranged and extended so as to be capable of extending and retracting in the form of a swing-out rod, and the plurality of pipe portions and the longitudinal lengths of the plurality of pipe portions are adjusted and held at a predetermined length. And a regulating means, the cross section perpendicular to the longitudinal direction of each pipe section is characterized in that it comprises a V-shape.

[0007] According to such a motorcycle shaft frame, it is possible to adjust the length of the shaft body when riding on the motorcycle so that the distance between the saddle and the steering wheel can be set to an optimum position. When the rider's weight is put on the saddle,
Each pipe portion is formed so that a cross section perpendicular to the longitudinal direction has a V-shape, and a gap is provided between a lower end portion on the inner cylinder side and a lower end portion on the outer cylinder side where a plurality of pipe portions each overlap. Therefore, the lower end of the inner cylinder is fitted into the V-shaped valley of the lower end of the outer cylinder so as to bite into the V-shaped valley, so that the movement between the pipes is restricted and a shaft frame without rattling is realized.

When the two-wheeled vehicle is not used, the shaft body is most contracted to reduce the size of the two-wheeled vehicle. In this contracted state, when the frame is folded from the middle with the front and rear wheels at both ends, the minimum folding size can be achieved. .

It is desirable that one or a plurality of cuts are formed in the pipe at a certain distance in the axial direction from the end. The cut portion functions as a spring, and the shaft body is flexed, so that it is possible to reduce the impact load from the road surface.

[0010] It is desirable that either the outer surface or the inner surface of the pipe is subjected to a surface treatment having low friction and excellent wear resistance. Examples of the surface treatment include fluororesin composite nickel plating and fluororesin coating. Thereby, the length of the shaft body is adjusted by reducing the friction between the pipes, and the cross section of the pipe is V
Despite the letter shape, it becomes smooth and is advantageous in preventing wear caused by friction and in rust resistance.

Further, a motorcycle according to the present invention is provided with the shaft frame described above. According to such a two-wheeled vehicle, a two-wheeled vehicle that does not rattle during traveling or the like is realized.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an overall view of a foldable bicycle in which a shaft frame according to an embodiment is incorporated. The frame of the folding bicycle includes a front wheel support 9 for rotatably holding the front wheel 5 and a wheel base 3 disposed above the front wheel support 9 and supporting a steering column 10 having a handlebar 2 at an upper end. A front frame 1 provided at the front end, a rear wheel 6, a pedal 8 for rotating the rear wheel 6, and a rear frame 4 for supporting the saddle 7 are each provided with a mounting portion 12 for the front frame and the rear frame shown in FIG. , 41 are placed side by side, and the mounting portions of each other are joined by a hinge so that these portions can be folded in a state of being arranged side by side. The front frame 1 is provided so as to be capable of extending and retracting in the form of a swing-out rod, and includes a plurality of pipe portions and an adjusting means 30 for adjusting and holding the lengths of the plurality of pipe portions in the longitudinal direction.
According to 1, it is possible to extend and contract in the axial direction in the manner of a swinging rod, and when riding a motorcycle, the length of the shaft frame can be adjusted so that the distance between the saddle and the steering wheel can be set to an optimum position.
When the foldable bicycle is not used, it can be contracted and downsized. If it is miniaturized, it is convenient because it does not take up space for storage.

FIG. 2 is an overall view of a front frame according to the embodiment. FIG. 3 is a side sectional view of the front frame 1 and the adjusting means 30. The shaft body 11 is provided between the wheel pedestal 3 of the front frame 1 and a rear frame mounting portion 12 connected to the rear frame 4. The components of the shaft body 11 are made of metal such as iron and aluminum. The shaft main body 11 includes first and second pipe sections 13 and 14 arranged and configured to be capable of extending and retracting movement of a swinging rod type, and first and second pipe sections 1.
And adjusting means 30 for adjusting and holding the lengths 3 and 14 at a predetermined length. The first pipe portion 13 is slidably inserted into the second pipe portion 14.

The first and second pipe sections 13, 1
4 are both triangular prism-shaped, and the cross section perpendicular to the longitudinal direction has a shape including a V-shape. Therefore, when the rider's weight is applied to the saddle 7, the gap 19 is provided between the valleys of the overlapping first and second pipe portions 13, 14, so that the first pipe is provided. Since the V-shaped end of the portion 13 fits into the V-shape of the second pipe portion 14 and comes into contact with the bite, the movement between the respective pipes is restricted, and the rattling during running is restricted. A shaft frame that does not occur is realized. The conventional shaft is composed of two cylindrical pipes, one of which is inserted into the other pipe, the metal fittings that tighten the two pipes are loosened, the shaft is extended, and the pipe is connected with the metal fittings. When tightening, the metal fittings are loosened due to unevenness of the road surface during running and the like, causing the frame to rattle and making the running unstable, but in the present embodiment, by providing this V-shape, Such defects are eliminated.

Further, either the outer surface of the first pipe portion 13 or the inner surface of the second pipe portion 14 of these slidably inserted pipes is coated with a fluororesin coating or a fluororesin composite nickel. Plating is applied. This makes it possible to adjust the length of the shaft body by reducing the friction between the pipes, so that the pipe has a V-shaped cross section without lubricating oil or the like, and is smooth and wear caused by friction. It is also advantageous for prevention of rust and rust resistance.

A dust cover may be provided on the outer periphery of the joint between the plurality of pipes. This makes it possible to prevent foreign matter from entering the joint.

As shown in FIG. 3, the first and second pipe sections 13 and 14 are provided with escape prevention means which can be extended and retracted in the form of a swing-out rod and which prevent them from falling off each other. The structure of the slip-off prevention means is the first pipe portion 13.
A plate-like projection 17 is provided on the outer upper surface of the first and second plate portions 14, and a plate-like projection 18 is provided on the inner upper surface of the second pipe portion 14 at positions where the first and second pipes do not fall out of each other. The bodies 17 and 18 serve as stoppers for each other to prevent falling off. The plate-like projections 17 and 18 are preferably made of a resin such as bakelite to prevent damage to the pipe. When the plate-like projections 17 and 18 are made of a metal such as aluminum, it is desirable that the surface is subjected to a surface treatment with low friction and excellent wear resistance. Examples of the surface treatment include fluororesin composite nickel plating and fluororesin coating. This makes it possible to reduce friction between the pipes and prevent abrasion caused by friction, and it is also advantageous for rust resistance.

As shown in FIG. 3, the length adjusting means 30 of the shaft frame is provided at a position where the first pipe portion 13 and the second pipe 14 overlap and is inserted into the second pipe portion 14. This is a structure in which the first pipe portion 13 is pressed in the direction of the V-shaped valley and bites. The first configuration
Press bolt 2 for pressing pipe portion 13 in the above direction
5 is inserted through a hole provided on the upper surface of the second pipe portion 14 where the plate-like projection 18 is provided, and the screw hole 2
6, a knob 24 for turning the pressing bolt 25 and a cover 22 for preventing the pressing bolt 25 from coming off by turning the pressing bolt 25 in the opposite direction to the pressing are provided. A pressing body 23 made of a material such as resin is attached to the tip of the pressing bolt 25 to prevent the first pipe portion 13 from being damaged. Knob 24
Is turned, and the pressing bolt 25 is screwed in.
Hits the upper surface of the first pipe portion 13 and presses the upper surface of the first pipe portion 13 to cause the first pipe portion 13 to bite into the valley direction of the second pipe 14 so that the first and second pipe portions 13
14 can be held in place.

FIG. 4 is an enlarged view of a main part of the first pipe section. Cut portions 50 are formed at two positions, that is, a V-shaped top portion and a center portion of the upper surface, at a fixed distance from the end portion along the axial direction. As described above, the V of the first pipe portion 13
The V-shape fits into the V-shape of the second pipe portion 14 and has the effect of eliminating rattling. However, the cut portion 50 is cut when further force is applied from the fitted state. The bent portion is bent inward to absorb the bent portion, so that the entire shaft body 11 is flexed. This bending returns to normal when the applied force is released. Since the shaft main body 11 is disposed between the front wheel 5 of the bicycle and the shaft main body 11, the shaft main body 11 has a great influence on traveling. In this embodiment, the shaft main body 11 functions as a spring by the cutout portion 50, so that the folding type bicycle is provided with a riding comfort that is not provided by an ordinary bicycle. Incidentally, the cut portion 50 formed in the first pipe portion 13 also has an effect of easily releasing from this state when the first pipe portion 13 bites into the second pipe portion 14 and comes into contact therewith. .

FIG. 5 is an overall view of a bicycle incorporating a shaft frame according to another embodiment. Frame 5
Reference numeral 2 denotes a front wheel support 3 that rotatably holds the front wheel 5 and a wheel base 3 disposed above the front wheel support 9 and supporting a steering column 10 having a handlebar 2 at an upper end, at a front end.
A saddle support 51 for supporting the saddle 7 is provided at the rear end. The rear wheel 6 is rotatably held, and a rear wheel support 53 having a pedal 8 for rotating the rear wheel 6 is connected to a lower rear side. ing. Wheel pedestal 3 of frame 52 and saddle support 51
A shaft body 1 having a plurality of pipe portions arranged and configured to be capable of extending and retracting in the form of a swinging rod and adjusting means 30 for adjusting and holding the longitudinal lengths of the plurality of pipe portions.
By means of 1, the frame 52 can be extended and contracted in the axial direction in the form of a swing-out rod, and the distance between the saddle and the steering wheel can be set at an optimum position by adjusting the length of the shaft frame when riding a motorcycle. When the bicycle is not used, the bicycle can be contracted and downsized. If it is miniaturized, it is convenient because it does not take up space for storage.

The present invention is not limited to the above-described embodiment which merely shows the best mode for carrying out the present invention, but encompasses all modifications of the invention falling within the scope of the claims of the present invention. The shape, size, arrangement, and the like can be changed.

[0023]

According to the motorcycle shaft frame of the present invention, since the lengths of the plurality of pipes can be adjusted, the length of the shaft body is adjusted when the motorcycle is mounted, so that the distance between the saddle and the steering wheel is increased. Can be set to the optimum position. When the motorcycle is not used, the motorcycle can be contracted and downsized.

Further, since each pipe portion is formed such that an arbitrary cross section perpendicular to the longitudinal direction has a V-shape, a shaft frame in which movement between the respective pipes is restricted and no play is realized is realized.

[Brief description of the drawings]

FIG. 1 is an overall view of a foldable bicycle in which a shaft frame according to an embodiment is incorporated.

FIG. 2 is an overall view of a shaft frame according to the embodiment.

FIG. 3 is a side sectional view of the front frame 1 and the frame length adjusting means 30 according to the embodiment.

FIG. 4 is an enlarged view of a main part of a first pipe section.

FIG. 5 is an overall view of a foldable bicycle incorporating a shaft frame according to another embodiment.

[Explanation of symbols]

5 front wheel, 6 rear wheel, 3 wheel base, 4 rear frame, 1 front frame, 12 rear frame mounting part, 1
DESCRIPTION OF SYMBOLS 1 ... Shaft main body, 13 ... 1st pipe part, 14 ... 2nd
Pipe part, 30 adjustment means, 19 gap, 51 saddle support, 52 frame, 53 rear wheel support, 50
Notch,

Claims (8)

[Claims] 1. A front part provided at a front end thereof with a front wheel support for rotatably holding a front wheel, and a wheel seat disposed above the front wheel support and supporting a steering column having a handlebar at an upper end thereof. A motorcycle frame connecting a frame and a rear frame rotatably holding a rear wheel and supporting a pedal and a saddle, wherein the front frame includes the wheel pedestal and a rear portion connected to the rear frame. A frame mounting portion, comprising a shaft main body provided between the wheel pedestal and the rear frame mounting portion, wherein the shaft main body is arranged and configured to be capable of extending and retracting operation of a swing rod type, and a plurality of configured pipe portions. Adjusting means for adjusting and holding the lengths of the plurality of pipe portions in the longitudinal direction, wherein a cross section perpendicular to the longitudinal direction of each of the pipe portions includes a V-shape. Home. 2. A rear frame mounting portion of the front frame and a front frame mounting portion of the rear frame can be joined by a hinge, and these portions can be folded in a state of being arranged side by side. 2. The shaft frame for a motorcycle according to 1. 3. The motorcycle shaft frame according to claim 1, wherein a gap is provided at each of the overlapping portions of the plurality of pipe portions. 4. The shaft frame for a motorcycle according to claim 1, wherein the pipe portion has one or more cut portions formed axially from an end thereof. 5. A lengthwise length of each of the plurality of pipe portions is adjusted and maintained at a predetermined length by pressing the lower portion of the inner cylinder side where the plurality of pipe portions overlap each other so as to bite into the lower portion of the outer cylinder side. The motorcycle frame according to claim 1, further comprising an adjusting unit that adjusts. 6. The motorcycle frame according to claim 1, wherein one of an outer surface and an inner surface of the pipe portion is subjected to a surface treatment having low friction and excellent wear resistance. 7. The motorcycle shaft frame according to claim 6, wherein the surface treatment is a surface treatment in which a solid lubricant is dispersed in plating of nickel or the like or a surface treatment in which a fluororesin is coated. 8. A motorcycle comprising the shaft frame according to claim 1.