JPS632389Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to bicycles.

The objective was to provide a front-wheel drive bicycle, which had never been put into practical use before, and which would allow for extremely unique bicycle designs as it would not be restricted by the size of the rear wheel, and would also The purpose is to greatly simplify the structure of a three-wheeled bicycle with two wheels arranged in parallel.

Traditionally, it was common knowledge that bicycles were rear-wheel drive, and front-wheel drive was considered impossible.

The reason for this is that the front wheels turn left and right when the steering wheel is operated, so it is difficult to tension the chain, and the chain twists, making it difficult to drive. The main theory was that when installed and driven, the chain's tensile force would always cause the steering wheel to swing in the direction where the gear was attached.

However, these are only theoretical problems, and no prototypes have been produced or tested.

The inventor believes that if a front-wheel drive bicycle were to be put into practical use, the restrictions on rear wheel size would be freed and a very unique bicycle could be designed. Thinking that the structure of bicycles would be extremely simplified, he dared to go beyond conventional wisdom and fixed concepts and conducted prototype experiments and succeeded in producing the bicycle of this invention.

That is, a freewheel gear is attached to the side of the center of the front wheel of the bicycle, an idle gear is installed to the side of the head pipe of the bicycle, and a tension gear is installed above the idle gear, and a large gear is used to drive the chain by the pedal. While meshing with the upper side of the tension gear from the upper side, it is guided from the upper side of the freewheel gear to the lower side, further meshing with the upper side of the idle gear, and stretched so as to circulate to the lower side of the large gear. He came up with the idea of a front-wheel drive bicycle featuring these features.

The invention will be explained with reference to the drawings.

FIG. 1 is a schematic side view of one embodiment of the bicycle of the present invention.

As shown in this figure, according to the present invention, a freewheel gear 2 is attached to the center side of the front wheel 1 of a bicycle (on the right side in this figure) to use the front wheel 1 as a driving wheel. Further, an idle gear 4 is installed on the side of the head pipe 3 of the bicycle, and a tension gear 5 is also installed on the side of the head pipe 3 and above the idle gear 4 so as to be able to swing freely.

It is preferable that the idle gear 4 and the tension gear 5 are installed using the head pipe 3 as a base, but the invention is not limited to this.In short, the idle gear 4 and the tension gear 5 should be installed near the side of the head pipe 3. becomes important.

Then, the chain 6 is tensioned as shown in Fig. 1. In other words, when the pedal 7 is depressed, the large gear 9, which rotates via the crank 8, is meshed from above with the upper side of the tension gear 5, which is then guided from the upper side of the freewheel gear 2 to the lower side, where it meshes with the upper side of the idle gear 4, and then rotates downward to the lower side of the large gear 9. Of course, it is desirable that the freewheel gear 2, idle gear 4, tension gear 5, and large gear 9 are aligned in a straight line when viewed from above.

Further, as shown in FIG. 1, the front fork 10 on one side of the front fork, that is, on the right side in this figure, is branched back and forth from the lower end of the handle shaft 11 so that it does not come into contact with the chain 6, so that the front fork 10 is located at the center of the front wheel 1. It is installed towards. It goes without saying that the other front fork (the one on the left, not shown) is attached toward the center of the front wheel 1 as it is conventionally.

When the pedal 7 is depressed, the chain 6 rotates as shown by the arrow A in the figure, causing the front wheel 1 to rotate forward as shown by the arrow B.

The biggest concern with this invention is whether or not the vehicle will be able to successfully cut curves while driving.

However, as a result of the trial production, it was found that there were no problems at all.

First, if you turn the handlebar 12 left and right, the front wheel 1 will also turn left and right, but the center of this rotation is the handlebar axis 1.
1 and the center of the front wheel 1, and the chain 6 hangs along the vicinity of this rotation center line, and the position of the part of the front wheel 1 near the chain 6 hardly changes due to the curve. . In other words, even if you turn the handlebar 12 to the left or right, the front wheel 1 is the chain 6.
There is no contact at all, and the chain 6 only twists slightly.

Next, there is a concern as to whether or not it will be possible to drive the bicycle even if this chain 6 is twisted. The fact that the distance between gear 4 and freewheel gear 2, and the distance between freewheel gear 2 and tension gear 5 are both quite long, work synergistically to completely eliminate distortion caused by a slight twist of chain 6. It turned out that there was no problem.

The above facts apply when the steering wheel is operated within a range of 45 degrees to the left and right, a total of 90 degrees, and when riding a bicycle in real life, the steering wheel is not turned more than 45 degrees, so it is sufficiently durable for practical use. be.
Further, as will be described later, it is more preferable to have a structure in which the tension gear 5 can be rotated left and right in response to the twisting of the chain 6.

Furthermore, in the case of Fig. 1, since the drive device is installed on the right side of the bicycle, there was a concern that pressing down on the pedal 7 would cause the front wheel 1 to rotate to the right and cause the handlebar 12 to swing to the right. , it turned out that there was no problem at all.

In other words, even though the drive device is installed on the side of the bicycle, the distance from the center is small, and the torque is very small compared to the fact that both ends of the handlebar 12 are far away from the center of the bicycle. In addition, the front wheel 1 is strongly pressed downward by the weight of the person riding the vehicle, and cannot be easily rotated to the side with the weak torque described above, and the above concerns are completely ignored as long as one's hands are on the handlebar 12. It has been proven that it is possible.

Next, if the bicycle of the present invention is designed for children, the distance between the freewheel gear 2 and the tension gear 5 will be quite short, so the tension gear 5 should be able to rotate left and right to accommodate the twisting of the chain 6. It is desirable to design it.

FIG. 2 is a schematic front view of an example of the present invention in which the tension gear 5 is installed so as to be able to rotate left and right.

As shown in this figure, a swing base 1 is attached to a bicycle head pipe 3 via a spring device 13, for example.
4 is provided with a bearing body 15 that rotates horizontally, and the tension gear 5 is mounted on this shaft, the base 14 swings according to the tension of the chain 6, and the chain 6
The bearing body 15 rotates from side to side in response to the twisting of the chain 6, thereby preventing the chain 6 from escaping and making its rotation smooth.

It goes without saying that the above mechanism may be installed not only in children's bicycles but also in adult bicycles.

The present invention has the above-mentioned structure, and is a front-wheel drive bicycle, which was previously considered impossible, and is a typical invention that shows how different theory and practice are.

The advantages of this invention are that since it is a front wheel drive system, it is not forced by the rear wheels and is an excellent mechanism for preventing slips, similar to the front wheel drive of a car, and although the front wheels need to be a certain size, Since the rear wheel simply follows the front wheel and is not limited by its size, it is possible to design a bicycle with a very unique shape. Furthermore, conventional tricycles have one-wheel drive at the rear, which makes it difficult to turn in the direction of the drive wheel, and the adjustment structure for adjusting the body tilt is quite complicated and expensive. However, if the bicycle of the present invention is designed as a three-wheeled bicycle, it will have a front-wheel drive, so it will not have any problem with curves, and it will be possible to manufacture it with a very simplified structure.

The invention described in detail above is a front-wheel drive bicycle that completely breaks conventional wisdom, and is an extremely novel and useful product that overturns fixed concepts and theoretical problems through practice. We are confident that front-wheel drive bicycles will become popular in the near future.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of one embodiment of the bicycle of the present invention. FIG. 2 is a schematic front view of an example of the present invention in which the tension gear is installed so as to be able to rotate left and right. 1...Front wheel, 2...Freewheel gear, 3...
...Head pipe, 4...Idle gear, 5...Tension gear, 6...Chain, 7...Pedal, 8
...Crank, 9...Large gear, 10...Front fork, 11...Handle shaft, 12...Handle, 1
3... Spring device, 14... Rocking base, 15
...Bearing body.

Claims (1)

[Scope of utility model registration request] A freewheel gear is installed on the side of the center of the front wheel of the bicycle, an idle gear is installed on the side of the head pipe of the bicycle, and a tension gear is installed above the idle gear, and the chain is installed above the large gear that is driven by the pedal. The gear is stretched so that it is meshed with the upper side of the tension gear, guided from the upper side of the freewheel gear to the lower side, further meshed with the upper side of the idle gear, and circulated to the lower side of the large gear. A front wheel drive bicycle with special features.