JPH05139356A - Different diameter wheel bicycle - Google Patents

Abstract

PURPOSE:To obtain the technically finished number of strong points such as the safety and the safe traveling of a bicycle at present, stable straight advance performance, and the compactness as the strong point of bicycle having different diameter wheels which existed in the past. CONSTITUTION:As for a bicycle 1 having different diameter wheels is constituted of a large diameter front wheel 2 and a small diameter rear wheel 3, and is equipped with a driving part having a pedal 6 and a crank 7 for driving the driving shaft of the hub of the front wheel 2, at the top edge part of a front fork 5 which is continuously installed on a handle 4, and the driving shaft for the hub of the front wheel 2 is supported in the rear part by a prescribed quantity from the vicinity of the top edge of the front fork 5. Further, a planetary gear device 8 having a ratchet device between a driving part having the pedal 6 and the crank 7 and the driving part for the hub of the front wheel 2 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle with different diameter wheels in which front and rear wheels have different diameters.

[0002]

2. Description of the Related Art Conventional bicycles are generally used in which the front wheels and the rear wheels have the same diameter, and the wheel wheels with different diameters that exist in the past are not the same. It is known that it has been used or exhibited at an event or the like.

[0003]

In a bicycle having the same wheel diameters for the front wheels and the rear wheels, which have been widely and conventionally used, the wheel spacing between the front wheels and the rear wheels is determined in proportion to the wheel diameter. If the wheel diameter is large, the wheel interval is large, that is, the total length is long, the storage space is large, and the running stability is poor. However, even if you row a little because of the wheel diameter, the traveling amount is large and the amount of rowing is also small. On the other hand, if the wheel diameter is small, the wheel interval is small, that is, the total length is short and the storage space is small, and the running stability is also good. Get better. However, the amount of travel is small and the amount of paddling is also large. In addition, since the drive shaft of the front wheel hub is supported near the front fork tip, or is supported a predetermined amount forward of the front fork tip, the straightness is poor, that is, the force in the direction in which the front wheel is pushed from behind. The front wheels are swayed and the straightness is poor. In this way, conventional bicycles have advantages and disadvantages depending on the wheel diameter,
In addition, since the straightness is poor, the steering performance is poor and there is a problem in safety. Furthermore, in the past, wheels with different diameters, where the wheel diameters of the front and rear wheels are not the same, are rotatably driven by the drive unit that has a pedal and a crank, because the rotation support shaft of the hub at the front fork is directly driven. Direct the steering wheel and front wheels to the pedal to which the force was applied at that time, so that you can run while keeping a balance, and you can ride with the same balancing method as acrobatics or unicycles that have become popular in recent years. It requires a degree of skill and is not general, and because the front wheel rotation spindle is directly driven, there is no idle state with one-to-one rotation, so there is always a state of rowing while running, which is not generally usable. It was When the bicycle having the different diameters is braked and stopped, the bicycle is slanted forward and it is dangerous to operate the brake. In addition, although the front wheels are large, speed can be obtained with respect to the amount of rowing, but as mentioned above, running was extremely unstable, so it was dangerous to speed up.

Therefore, the present invention solves the above-mentioned drawbacks, the bicycle length is short and compact, the traveling amount is large relative to the pedaling amount, the maneuverability of driving is good, and the ride can be performed easily. The purpose of the present invention is to provide a bicycle with different diameters, which is straighter than the current technically completed bicycle and is capable of safe and stable running.

[0005]

In order to solve the above drawbacks, the front wheel has a large diameter and the rear wheel has a small diameter, and the drive shaft of the hub of the front wheel is driven directly to the tip of the front fork connected to the handle. In a bicycle with different diameters provided with a drive unit having a pedal and a crank, a drive shaft of a hub of the front wheel is supported by a predetermined amount behind the vicinity of the front fork tip.

Further, a planetary gear unit having a ratchet device is provided between a drive unit having a pedal and a crank and a drive shaft of a hub of front wheels.

[0007]

With the above-described structure, when the front wheel hub drive shaft is rotated by stepping on the pedal, the front wheel rotates in the stepping direction and at the same time the stepping shaft supporting the handle and the front fork is stepped on. The force to fall toward you acts. However, by supporting the drive shaft of the hub rearward by a predetermined amount from the vicinity of the front fork tip, the action of tilting toward the step by the amount supported by the rearward predetermined amount becomes smaller and the driving force is not applied. The supporting force of the pedal is increased by the amount supported by the rear side by the predetermined amount. As a result, the action of rotating the front wheels is greater than the action of leaning toward the stepping person, and the front wheels rotate to drive stably. In addition, the drive shaft of the hub of the front wheels is supported behind the front fork by a predetermined amount, so the front wheels move forward with a force that pulls from the front, which stabilizes the front wheels and increases straight-line performance and maneuverability. Will get better. And
When the pedal crank is rowed, the planetary gear device speeds up the rotation of the front wheel, and the ratchet device transmits the rotational force of the pedal crank to the front wheel only in one rotation direction.

[0008]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a different-diameter wheel bicycle. The different-diameter wheel bicycle 1 has a front wheel 2 having a large diameter and a rear wheel 3 having a small diameter, and a front fork 5 connected to a handle 4 and a fork 5 of the fork 5. The pedals 6, 6, the cranks 7, 7 and the planetary gear device 8 are provided by being shifted rearward by a predetermined amount in the vicinity of the tip end portion, and the saddle 10 is provided at a substantially intermediate position of the frame 9 supporting the front wheel 2 and the rear wheel 3. . In addition, 11 is a front brake, 12 is a rear brake, 13 is a rear fork, and 14 is a spoke.

As shown in FIG. 2, the planetary gear device 8 has a fixed internal gear 15, a planetary gear 16 that rolls, a sun gear 17 that rotates, and a carrier 18, and as shown in FIG. A ratchet 19 having internal teeth formed on the sun gear 17 and a ratchet pawl 20 that is interlocked with the ratchet 19 are connected to a hub 21. A drive shaft 22 is fixedly connected to the cranks 7, 7 and the carrier 18. Further, the planetary gear 16 is the internal gear 15
Although it is arranged at three locations in the interior, only one location is shown in the figure.

When the pedals 6 and 6 are pedaled to rotate the cranks 7 and 7 and the carrier 18, the carrier 18
A planetary gear 16 rotatably pivotally mounted on the sun wheel 17 rolls along the fixed inner wheel 15 in the direction opposite to the pedaling direction of the pedals 6, 6 and the sun gear 17 rotates in the same direction as the pedaling direction.
At that time, the ratchet 19 having the internal teeth formed on the sun gear 17 also rotates, and the ratchet pawls 2 connected to the hub 21 continuously.
The front wheel 2 rotates when 0 is hooked on the ratchet 19 and rotates together.

When the pedaling of the pedals 6, 6 is stopped, the ratchet pawl 20 connected to the hub 21 acts on the ratchet 19 in the sliding direction and the ratchet pawl 20 appears and disappears. The ratchet pawl 20 does not become the driving state but becomes the idling state. For this reason, the front wheels 2 can be directly driven and the vehicle can run in an idling state without driving the rear wheels via the chain as in the conventional case.

When the front wheels 2 are rotated by stepping on the pedals 6, 6, the front wheels 2 rotate in the stepping direction and also act in the direction in which the handle 4 is turned around a support shaft supporting the handle 4 and the front fork 5. However, the force that tends to fall also acts on the stepping side. However, the drive shaft 22 of the hub 21
By supporting the rear part of the front fork 5 by a predetermined amount from the vicinity of the front end thereof, the action of the handle 4 attempting to turn to the side of stepping by the amount supported by the rear part of the front fork 5 is reduced and the supporting force of the other pedal 6 is reduced. , It increases by the amount supported by a certain amount behind. As a result, the handle 4 is on the stepping side.
The action that the front wheels 2 try to rotate is greater than the action that tries to cut the steering wheel, and the steering wheel 4 becomes stable and the front wheels 2 rotate, so that more stable running is possible. Further, since the drive shaft 22 of the hub 21 of the front wheel 2 is supported by a predetermined amount rearward from the vicinity of the front end of the front fork 5, the front wheel 2 moves forward with a force in a direction such that it is pulled from the front, so that the front wheel 2 shakes left and right. It is stable without any increase and the straightness is increased and the maneuverability is improved.
Further, since the saddle 10 position is provided on the frame 9 at a substantially intermediate position between the front wheels 2 and the rear wheels 3, when the front brake 11 is driven while traveling stably, the drive shaft 2 of the front wheels 2 is moved.
The rocking action that occurs on the 2 axis is very small, so the front brake operation can be done safely.

The positional relationship among the handle 4, the drive shaft 22 and the saddle 10 may be changed appropriately within a stable traveling range. The front brake 11 shown in FIG. 1 is provided on the front side of the front fork 5, but it may be provided on the rear side of the front fork 5, but it is not shown. Further, it is preferable that the one embodiment illustrated in the above embodiment is appropriately modified in design within the scope of the claims.

[0014]

The present invention effectively achieves the intended purpose by the above-mentioned constitution and operation. In particular, the front wheel has a large diameter and the rear wheel has a small diameter, and it is provided at the tip of the front fork connected to the handle. In a wheel with different diameters provided with a drive unit having a pedal and a crank for directly driving the drive shaft of the hub of the front wheel, the drive shaft of the hub of the front wheel is supported by a predetermined amount behind the front fork front end. As a result, the front wheels do not sway left and right, the straightness is increased, and the maneuverability is improved, the bicycle length is short and compact, the storage space is small, the turning is small, and even bicycles with different diameters are safe and It is possible to drive stably. In addition, you can stop safely without falling down like you can with the front brake operation. Further, since the planetary gear unit having the ratchet device is provided between the drive system having the pedal and the crank and the drive shaft of the hub of the front wheels, the pedaling amount with respect to the pedaling amount even if the front wheels are directly driven. There is a lot of travel, and you can ride comfortably because you can run even when the pedal is idling, without getting tired like the bicycles with different diameter wheels that existed in the past. in this way,
In addition to many technically completed advantages such as safety and stable running, which are the advantages of current bicycles, stable straight-ahead driving is obtained and maneuverability is improved. It is possible to obtain the advantages of both of them, such as being compact, and it has a great effect in practical use.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a plan cross-sectional view showing cranks 7, 7, a drive unit of the planetary gear device 8 and a main portion in the vicinity of a hub 21.

FIG. 3 is a side sectional view showing essential parts of a sun gear 17, a ratchet 19 and a ratchet pawl 20.

[Explanation of symbols]

 1 Wheels with different diameters 2 Front wheel 3 Rear wheel 4 Handle 5 Front fork 6 Pedal 7 Crank 8 Planetary gear unit 19 Ratchet 20 Ratchet pawl 21 Hub 22 Drive shaft.

Claims (2)

[Claims] 1. A different diameter in which a front wheel has a large diameter and a rear wheel has a small diameter, and a drive portion having a pedal and a crank for directly driving a drive shaft of a hub of the front wheel is provided at a front end portion of a front fork connected to a handle. A wheel bicycle having different diameters, characterized in that the drive shaft of the hub of the front wheel is supported by a predetermined amount behind the vicinity of the front fork tip. 2. A bicycle having different diameters, wherein a planetary gear device having a ratchet device is provided between a drive unit having the pedal and crank of claim 1 and a drive shaft of a hub of front wheels.