JPH09142361A - Rotor pair type leg stepping force power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the wasteful load on legs and improve rotating force by fitting an oval gear of the input side at the crank angle so that the gear ratio becomes the low geared area in the low area of the leg stepping force and the gear ratio of the input side becomes the high geared area in the maximum area of the leg force. SOLUTION: An oval gear 1 of the input side is fitted and fixed to a main shaft 5, and a right crank 9 having a pedal 11 and a left crank 10 having a pedal 12 are diagonally fitted and fixed to the main shaft 5 at the crank angle that the gear ratio becomes the low geared area in the low area of the leg stepping force. The meshed gear ratio is periodically shifted between the low geared area and the high geared area by the rotation of the oval gear. The input distribution in response to each crank angle is facilitated, the efficiency of the leg stepping force is increased, and the rotative driving force is improved. The wasteful leg stepping force is avoided, and the load on legs can be reduced when the pedals 11, 12 are depressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transmitting a rotational motion due to a human foot force to another, and is a device in consideration of improving the efficiency of the foot force for controlling the movement of an object and reducing the load on the foot. , It can be used especially for important driving such as bicycles.

[0002]

2. Description of the Related Art In a conventional rotary drive device using a human foot pedal force, a reverse gear is directly rotated by a crank, and it is not a method of inputting a foot pedal force in consideration of a periodical change in a pedal force. Basically, it does not solve the burden on the foot when stepping on the pedal or increase the efficiency of the stepping force.

[0003]

However, if the conventional stepping force input at each crank angle is changed to the stepping force input corresponding to each crank angle, the unnecessary load on the foot is reduced and the rotational force is reduced. Is obtained.

[0004]

[Means for Solving the Problems] In consideration of such a point, a pair of oval gears having a characteristic in which the meshing distances of the two are periodically changed depending on the rotation angle are used for the foot force input side and the foot force input side. In other words, the gear ratio of the oval gear on the input side is the characteristic of the variable gear ratio that periodically shifts from low gear to high gear and then to low gear by the rotation of a pair of oval gears, and then returns to high gear. In the lower range,
If the crank is attached to the oval gear on the input side at the crank angle in the low gear area, the input side becomes the high gear area in the maximum pedaling force area. As a result, the stepping force can be input according to each crank angle. At this time, the oval gear on the output side rotates in the reverse direction, so other gears are combined and returned in the direction of rotation on the input side. Whether the pair of oval gears are used for the rotor as shown in Fig. 1 or the pair of cocoons having the same cocoon cross section as shown in Fig. 2 are used, the characteristic that the gear ratio is changed periodically is obtained. However, for convenience, the rotor is treated as an oval gear.

[0005]

Thus, in the present invention, a pair of oval gears is used for the rotor on the input side and the output side of the stepping force shown in FIG.
2 shows the variable action of the gear ratio of the rotor on the input side and the rotor on the output side by the pair of oval gears.
Since the action of varying the gear ratio of the input side and the output side by the pair of cocoons of the cross section is the same as the important characteristic of the present invention, the description of the gear ratio variable characteristic of the pair of cocoons of the cross section is omitted.

First, the oval gear 1 on the input side is attached and fixed to the main shaft 5 which can be mounted and rotated on the frame, and the gear ratio of the oval gear 1 on the input side is set in the stepping force reduction region at the initial stage of pedal depression on the input side. The right crank 9 having the pedal 11 and the left crank 10 having the pedal 12 are diagonally attached and fixed to the main shaft 5 at a crank angle in the low gear range. This time,
Belt drive gear 4 rotated by reverse rotation compensation gear 3
On the axis of the main shaft 5. As a result, when the cranks 9 and 10 are rotated in the direction of arrow a, the main shaft 5 also rotates in the direction of arrow a, and the oval gear 1 also rotates in the direction of arrow a by the rotation of the main shaft 5, but the main shaft The belt drive gear 4 prepared for 5 is
The rotation is obtained by the reverse rotation correction gear 3. Secondary shaft 6, oval gear 2 on the output side, and reverse rotation compensation gear 3
Are fixed to the secondary shaft 6 so that and rotate in the same direction and rotate together with the mounting shaft, or the oval gear 2 and the belt drive gear 4 are fixed so that the secondary shaft 6 can rotate about its axis. The long diameter X of the oval gear 1 on the input side of these two shafts and the short diameter Y of the oval gear 2 on the output side are engaged and stored in gear cases 15 and 16 which are attached to the frame. At this time, the reverse rotation correction gear 3 and the belt drive gear 4 are also engaged. As a result, as shown in FIG. 3, the rotation of the oval gear 1 on the input side of A by the cranks 9 and 10 in the direction of arrow a causes the oval gear 2 on the output side of B to rotate in the direction of arrow b. Due to the rotation of the pair of oval gears in which the long diameter X and the short diameter Y mesh with each other, the gear ratio F meshing with each other repeats a periodic movement like a curve between the D low gear region and the E high gear region. Due to this characteristic, a low geared region is obtained in a region where the foot force transmission is low at the initial stage of pedal depression, and the rotor 2 on the output side is rotated with a small foot force. As a result, the pedal depression is smoothed, and the foot pedal force is increased in the maximum pedal depression area that is the input side high gear area, and the output side oval gear 2 is further rotated in the direction of arrow B. By this,
The reverse rotation correction gear 3 rotates about the secondary shaft 6 in the same direction as the oval gear 2. The reverse rotation correction gear 3 rotating in the direction of arrow B rotates the belt drive gear 4 in the direction of arrow a around the main shaft 5, and the belt or chain 7 is rotated by the belt drive gear 4 rotating in the direction of arrow a. Drive in the direction of arrow a to move the freehub 8
The rotational force of the oval gear 1 on the input side is transmitted to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is an exploded perspective view of a foot pedal power device using an oval gear as a pair of rotors. FIG.
FIG. 3 is an exploded perspective view of a foot effort power device using a pair of rotors and cocoons having a sectional shape. Both FIGS. 1 and 2 are summary diagrams for convenience of explanation. Frames to be fixed and attached, wheels, bearings for smooth rotation, washers, fixing fixtures, screws, etc. are omitted for convenience of explanation. The size and ratio of each gear, the thickness and length of the shaft, their mounting position and material, and the shape of the gear case, etc., vary depending on the purpose of use. The variable characteristic of the gear ratio by the pair of cocoon rotors in cross section in FIG. 2 is the same as the variable characteristic of the gear ratio of the pair of oval gears shown in FIG. The variable characteristics of the gear ratio obtained with a rotor made of a pair of cocoons with a cross section are large, but it is difficult to select the variable width.
In the oval gear, it is easy to select the ratio between the long diameter X and the short diameter Y of the gear itself (rotor), so the variable width of the gear ratio can be selected according to the purpose of use.

[0008]

As described above, the rotational driving by the foot force by the human power uses the pair of oval gears (a pair of rotors), so that the input distribution of the foot force according to each crank angle is repeated cyclically. This makes it possible to improve the efficiency of the foot force by improving the foot drive force, improve the rotational drive force, and reduce the load on the foot when the pedal is depressed by avoiding useless foot force.

[0009]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pair of rotor type foot pedal power unit using a pair of oval gears (a pair of rotors) of the present invention.

FIG. 2 is a pair of cross-sectional cocoons (a pair of rotors) according to the present invention.
By the rotor pair type. FIG. 3 is an exploded perspective view of a foot pedal power unit.

FIG. 3 is a diagram showing changes in the galley ratio of the oval gears on the input side and the output side by a pair of oval gears (a pair of rotors) according to the present invention.

[Explanation of symbols]

1 Input side oval gear (rotor) 2 Output side oval gear (rotor) 3 Reverse rotation compensation gear 4 Belt drive gear 5 Main shaft 6 Secondary shaft 7 Belt or chain 8 Freehub 9 Right crank 10 Left crank 11 Right pedal 12 Left pedal 13 Belt Guide Roller 14 Belt Guide Roller 15 Frame-side Gear Case 16 Gear Case 17 Input Side Cross Section Cocoon (Rotor) 18 Output Side Cross Section Cocoon (Rotor) A Input Rotor B Output Side Rotor C 1: 1 Gear ratio line D Low girder area E High girder area F Gear ratio line that varies depending on the rotation of a pair of oval gears G Right crank rotation curve H Left crank rotation curve X Long diameter of rotor (oval gear or cocoon of cross section) Y Rotation Child (Oval gir or cross section Shape cocoon) short diameter

Claims (1)

[Claims] A pair of oval gears 1 and 2 (a pair of rotors) having the same cross-sectional shape are paired by engaging the long diameter X of the oval gear 1 on the input side and the short diameter Y of the oval gear 2 on the output side. Do. When a rotational force is applied to the oval gear 1 on the input side, the gear ratios that mesh with each other according to their profiles repeatedly move cyclically from the low gear region to the high gear region and then again to the low gear region, while the oval gear 1 moves to the main shaft. On the axis of 5, the oval gear 2 rotates around the secondary shaft 6 as an axis, and the input side rotational speed and the output side reversely rotate. With this feature, a crank with a pedal that transmits the rotational force by the pedal force is attached to the oval gear on the input side at a crank angle where the galley ratio on the input side is in the low geared region in the region where the transmission of foot force is reduced at the initial stage of pedal depression. As a result, the gear ratio on the input side shifts to the high gear range at the time when the pedal angle reaches the maximum crank pedal angle. As a result, the pedaling force of stepping on the pedal is efficiently transmitted to the output side, and the belt drive gear 4 is rotated about the main shaft 5 by the reverse rotation correction gear 3 that is rotated in the same direction as the output side oval gear 2 that rotates in the reverse direction. The belt drive gear 4 is rotated by rotating it in the direction of rotation on the input side.
Then, the belt or chain 7 is driven to transmit the rotational force due to the stepping force to the freehub 8. Rotor pair type, foot pedal power unit.