Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Gear shiftable axially to disconnect or vary ratio
Patent
1997-08-29
1999-10-26
Wright, Dirk
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
Gear shiftable axially to disconnect or vary ratio
475297, 745942, B62M 1116
Patent
active
059718846
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a power changing apparatus which is installed in a rear hub of a bicycle, and more particularly, to a power changing apparatus having a transmission at one side, a bi-directional pedaling device at the other end and a clutch therebetween, which outputs the power only one direction regardless of the direction of applied power and simultaneously change rotation speed of the bicycle in accordance to the traveling state of the bicycle to drive a rear wheel of the bicycle.
BACKGROUND ART
Generally, a bicycle is classified into three: a general bicycle as transport means, a mountain bicycle exclusively used for a mountain exercise and cycles used for a sporting event. Basically, the above all bicycles include front and rear wheels before and after a bicycle frame and a pair of pedals as a power supply source between two wheels. The driving force for bicycle is obtained through pedaling and then the force is transmitted to the rear wheel via a driving sprocket, a chain and a driven sprocket in sequence. However, most of bicycles can travel forward only when pedaling forward. That is, the bicycle cannot travel forward when pedaling rearward. This kind of one-directional bicycle causes easily fatigue in rider's leg and uneven development in a leg muscle when the rider bicycles for many hours.
Thus, in order to solve the problems, many inventors have made an effort in the development of a bi-directional pedaling apparatus which can be applied to a conventional one-directional bicycle. The bi-directional pedaling apparatus developed until now, which allows the bicycle to travel forward both when pedaling forward and rearward, may be classified into three roughly according to methods adopted therefor. That is, there are methods using an auxiliary gear, a bevel gear and a planetary gear. Here, the bi-directional pedaling apparatus is referred to a device in which a bicycle can travel forward at all times when pedaling the bicycle forward or rearward, and an idling is also allowed by selectively controlling a lever if required when pedaling the bicycle rearward, like a conventional bicycle.
As a representative invention related to the bi-directional pedaling apparatus. Manrzoursos et al. (EPO Publication No. 0.369,925) discloses a bi-directional pedaling apparatus adopting the auxiliary gear, Foster (U.S. Pat. No. 5,435,583) discloses a bi-directional pedaling apparatus adopting the bevel gear and a clutch. and the present applicant (Application No. PCT/KR 96/00236) discloses a bi-directional pedaling apparatus adopting the planetary gear.
The above inventions have a mid gear (auxiliary gear, bevel gear and planetary gear) in common in order to change the direction of power, however, also have difference in a method for changing the power direction, distribution degree of load applied to each part during the change of power, preciseness of parts and compatibility with a conventional bicycle. However, all of the inventions are developed to be attachable to a pedal shaft, not to a shaft of the rear wheel.
Particularly, the bi-directional pedaling apparatus (Application No. PCT/KR 96/00236) invented by the present applicant has many advantages in the aspects of preciseness of parts, smoothness in the change of power, compatibility to be directly attachable to a pedal shaft of the conventional bicycle. However, the shapes of the driving sprocket and a crank portion are different from those of the conventional bicycle, so that these parts should be changed by new ones when attaching the apparatus to the conventional bicycle.
Also, since the bi-directional pedaling apparatus invented by the present applicant is attached to the outside of the pedal shaft like the above-described apparatuses, the attached apparatus is protruded toward the outside of the bicycle frame. The protruded apparatus may obstruct the pedaling by a rider. In addition, it is difficult to attach the bi-directional pedaling apparatus protruded toward the outside of the bicycle frame to a newly developed b
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patent: 5527230 (1996-06-01), Meier-Burkamp
patent: 5562563 (1996-10-01), Shoge
patent: 5785625 (1998-07-01), Matsuo et al.
Kwon Peter T.
World Industry Co., Ltd.
Wright Dirk
LandOfFree
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