JPS5921829B2 - A foot rotation device that moves and eccentrically rotates a bicycle chain gear with a rectangular shaft hole. - Google Patents

Description

[Detailed Description of the Invention] The present invention is a bicycle change gear with a rectangular shaft hole that moves eccentrically and achieves a much lighter thrust compared to conventional bicycles without changing the vehicle speed of the bicycle at all, that is, without reducing the vehicle speed. The present invention relates to a foot rotation device that makes one rotation at a time.

Conventionally, in the case of a change gear that rotates in a perfect circle, in order to achieve light petal thrust, the weight of the components has been reduced, or a means of shifting the rear gear and inner gear has been used, but in both cases the cost has been reduced. In the latter case, there was the problem that the vehicle speed would decrease.

On the other hand, a mechanism fundamentally different from the above-mentioned perfect circular rotation, in which the front gear is eccentrically moved and rotated, is known, for example, from Japanese Patent Laid-Open No. 49-88240. In all such conventional eccentric rotation gear systems, the pedal pedal force is applied while the crank moves from the top dead center to the bottom dead center, and this is approximately 45 degrees to 135 degrees from the lightness of the petal thrust.
It did not take into consideration the fact that it is desirable to apply the maximum pedal force in the range of about 100 degrees, and the drawback was that it lacked the lightness of petal thrust.

The present invention has been made in view of these conventional drawbacks.
The eccentricity of the front gear peaks at approximately 90 degrees without reducing the vehicle speed and causing any discomfort in the pedal force.When pedal force is added from this point and the pedal reaches the 135 degree position, the pedal force becomes pulsating and strong. so that it can be added,
The main purpose of this system is to make maximum use of the energy generated by the human foot to drive the bicycle by alternately depressing the left and right cranks. To provide an eccentric rotation device for a front gear of a bicycle that can be easily assembled and has excellent durability, compatibility, and maintainability.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a vehicle body frame, and 2 is a banger shaft for mounting a crank which is pivotally connected to the vehicle body frame.

Reference numeral 3 denotes an elliptical pedestal, which has an annular groove 4 similarly elliptical in its front periphery, and a through hole 5 bored at a position slightly eccentrically forward from the center. The banger shaft 2 is loosely inserted through the bumper shaft 2 and then fixedly attached to the vehicle body frame 1.

Reference numeral 6 denotes a front side chain gear, which has an elongated shaft hole 7 bored in its center, and a guide shaft 8 located near one longitudinal end of the shaft hole 7 on the back side of the chain gear. On the other hand, a pair of left and right passive rails 9, 9 are fixed to the front surface of the Cheno Gear on both sides of the shaft hole 7 so as to face each other parallel to the longitudinal direction of the shaft hole, The banger shaft 2 is inserted into the shaft hole 7 from the back side thereof, and the guide shaft 8 is loosely inserted into the annular groove 4 of the pedestal 3.

10゜11 are left and right cranks, of which right crank 1
1, a transmission plate 12 is fixed to the side surface near the tip on the crankshaft side, and the transmission plate is slidably inserted between the passive rails 9° 9, and then the right crank 11 is attached to the banger shaft 2 with a shaft nut. It is constructed so that it can be assembled by tightening and fixing.

14,14 indicates a petal, and 15 indicates a cheno. In the foot rotation device having the above configuration, when the pedals 14, 14 of the left and right cranks 10, 11 are stepped on to rotate the chenogya 6, the right crank 11 is at the top dead center position shown in FIGS. 3 and 4. So it's not eccentric yet.

From this point on, as the crank rotates sequentially and begins to descend, Cheno Gear 6 rotates while moving eccentrically downward, slightly closer to the rear gear, and when it reaches the 90 degree position, the eccentricity reaches its peak as shown in Figure 5. .

While the bicycle is running, the pedal pedal force is applied strongly from around this 90 degree position, and the strongest pulsating force is applied until the crank rotates further and reaches the 135 degree position shown in Figure 6. Since this movement is performed alternately between the left and right cranks, the distance between the fulcrum and the point of action is shortened, while the distance between the point of action and the point of effort is extended compared to perfect circular rotation, so the pedal is The thrust is much lighter than in the case of perfect circular rotation.

I would like to add this as experimental data for your reference.
Gear ratio, Freon l-48T rear 15T gear ratio 3.2
If you calculate with an eccentricity of 30mm, the rear gear will remain unchanged at 15T, but the front gear will have the same result as rotating a chain gear with an average of 42T, and the crank will be about 25mm compared to a gear that rotates in a perfect circle. As a result, the distance between the points of application is extended, and from this figure, it can be seen that the moving eccentric rotation of the Chenogya is advantageous for rotations that apply energy in a pulsating manner, such as on a bicycle.

In the above embodiment, the annular groove 4 of the pedestal 3 is formed into an elliptical shape, but it goes without saying that even if the annular groove 4 is formed into a circular or polygonal shape, the movement and eccentric rotation of the Cheno gear can be obtained. be.

However, with an oval pedestal, when the left and right cranks rotated around 135 degrees, there was no error between the points of application and the left and right cranks worked evenly.

As described above with respect to the embodiments, according to the present invention, it is possible to effectively apply pedal pedal force in the rotation range of about 45 degrees to about 135 degrees of the crank by eccentrically moving and rotating the front gear. This gives you a petal thrust.

The lightness of the Betal Thrust mentioned above is also achieved by attaching the pedestal, which is the material necessary to eccentrically move and rotate the front gear, to the vehicle body frame so that the weight of the material rotated by the pedal pedal pressure does not increase. This will help ensure that.

In addition, in the case of conventional cars where the pedaling force is reduced using a rear or inner gear shaft, the passenger inevitably ends up increasing the pedaling pitch as it reduces the vehicle speed. Generally speaking, the average petering pitch rhythm for an adult is 45 to 50 revolutions per minute, and when converted to a speed of 14 km to 15 km per hour, the most suitable pitch is 14 km to 15 km per hour.More vigorous petering pitches are tiring and can last for more than 20 minutes. This is difficult, but the present invention is advantageous in this respect as it does not reduce the overall vehicle speed.

Furthermore, for example, in Japanese Utility Model Publication No. 29-1508, there is an idea to make the pedal pedal force smaller by making the crank longer.
This does not mean that making the crank longer is better; if you make the crank longer, it will become lighter due to the principle of leverage, but the circle drawn by the petals will become larger, and under constant force, rotation will be delayed and fatigue will increase. However, the present invention does not have such a disadvantage.

Furthermore, the present invention has a simple mechanism structure,
As for assembly, it is only necessary to fit the front gear into the pedestal attached to the vehicle body frame and attach the crank to the banger shaft, so the assembly work is easy, and it is also excellent in compatibility and maintainability.

Therefore, it will greatly contribute to bicycle users as well as the bicycle industry both domestically and internationally.

[Brief explanation of the drawing]

The figures relate to one embodiment of the present invention, and Fig. 1 is an exploded perspective view, Fig. 2 is a perspective view of the change gear seen from the back side, and Fig. 3 is an exploded perspective view.
The figure is a longitudinal sectional view of the assembled state, Figures 4 to 6 are operating state diagrams, Figure 4 is a state diagram when the right crank is in the vertically upward position, and Figure 5 is a diagram of the right crank that can be rotated 90 degrees. Fig. 6 is a state diagram when the right crank is in a position rotated by 135 degrees. 1... Vehicle body frame, 2... Banger shaft, 3... Pedestal, 4... Annular groove, 6... Change gear, 7... ...shaft hole, 8
...Guide shaft, 9,9...Passive rail, 10,11...Right and left cranks, 12...
...Transmission plate.

Claims (1)

[Claims] 1. A pedestal with an elliptical or other annular groove formed on the front is attached to the vehicle frame so that the crank banger shaft protrudes from the center of the pedestal in an eccentric position slightly forward, and an elongated shaft hole is formed in the center. The banger shaft is loosely fitted into the shaft hole of the change gear, and a guide shaft protruding from the back of the change gear located near one longitudinal end of the shaft hole is loosely inserted into the annular groove of the pedestal. In addition, a pair of left and right passive rails are fixed to the front surface of the change gear across the shaft hole so as to be parallel to the longitudinal direction of the shaft hole, and a pair of passive rails is fixed to the front side of one of the cranks between the passive rails. The crank is attached to one end of the banger shaft by slidably inserting the transmission plate, and as the left and right cranks rotate, the guide shaft moves within the annular groove and the change gear moves eccentrically. A bicycle foot rotation device that rotates one rotation.