JP2000095175A - Bicycle employing planetary gears to pedal gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a bicycle more compact and lighter by employing a devised planetary gear unit to a pedal gear device of the bicycle, integrating an internal gear of the planetary gear firmly with a frame, positioning a planet carrier of the planetary gear between the internal gear and planetary gears as well as a sun gear, and rotating the planet carrier fixed to a pedal shaft. SOLUTION: A planet carrier 4 of planetary gears 2 is positioned between an internal gear 1 fixed to a frame and the planetary gears 2 as well as a sun gear 3, the planet carrier 4 is fixed to a pedal shaft that passes through the center of the sun gear 3, and the planetary gears 2 and the sun gear 3 are rotated with increasing speed in accordance with the rotation of pedals 7 and the planet carrier 4. The number of planetary gears is selected depending on a bicycle size, performance, price and the like. For power transmission from the planetary gears 2 to a rear wheel, a shaft 6 is used. The internal gear 1 is integrated with the frame of a bicycle. This permits the size and weight of the bicycle to be reduced. Even when the bicycle is a foldable bicycle, it is easily carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle using a planetary gear designed for a pedal gear.

2. Description of the Related Art Conventionally, power transmission of a bicycle is mainly performed by a chain type.

[Problems to be Solved by the Invention] A chain-type bicycle has limitations in miniaturization and weight reduction, and has disadvantages such as detachment of the chain and easy contamination. The rotation was also simple and not intriguing. The present invention has been made to solve the above problems.

Means for Solving the Problems A carrier of a planetary gear is placed between a fixed internal gear, a planetary gear and a sun gear, and the carrier is fixed to a pedal shaft passing through the center of the sun gear. The planetary gear and the sun gear rotate while accelerating with the rotation of. If the carrier is at a position other than the above, it is impossible to make a planetary gear rotated by a pedal. The number of planetary gears is selected from 2, 3, and 4 according to the size, performance, price, and the like of the bicycle. In order to take advantage of the characteristics of using planetary gears, power transmission with the rear wheels necessarily uses a shaft. The internal gear is integrated with the bicycle frame. The present invention has the above configuration.

[Effect of the Invention] By using a planetary gear and a shaft for the power transmission mechanism, it is possible to reduce the size and weight and to make the folding bicycle easy to carry. The integration of the internal gear of the planetary gear and the frame makes the car body smarter and lighter, increases the degree of design freedom, and makes it easier to design differently from conventional models. If the gear unit cover is made transparent, the movement of the planetary gears can be observed, and it will be interesting for adults and children, so that they will be more interested in machinery and technology. The present invention can be used for one-wheelers and three-wheelers.

[Brief description of the drawings]

FIG. 1 is a side view of an example of a bicycle using the present invention.

FIG. 2 is a side view of a pedal and a planetary gear unit.

FIG. 3 is a front front view of a pedal and a planetary gear unit.

[Explanation of symbols]

(1) Internal gear fixed and integrated with the frame (2) Planetary gear Revolves and rotates and revolves with the carrier that rotates with the pedal (3) Sun gear Bevel gear joined and rotated (4) Carrier internal gear (5) Bevel gear on the shaft side (6) Shaft (7) Pedal (8) Shaft support (9) Shaft joint
(10) Cover (11) Pedal shaft

Claims (4)

[Claims] 1. A bicycle that uses a planetary gear devised for a bicycle pedal gear. 2. An internal gear of a planetary gear is fixedly integrated with a frame. 3. The planetary gear carrier is placed between the internal gear, the planetary gear and the sun gear, and is fixedly rotated with the pedal shaft. 4. A sun gear and a bevel gear are joined and integrated, and power is transmitted to a rear wheel by a shaft, but a shaft joint is inserted in the middle of the shaft.