Variable transmission gearing system
AssigneeMega Unit Technology Limited
InventorsKim Leung Luk, Yam Ho Yeung
Life of this patent
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Abstract
A variable transmission gearing system for a bicycle includes a mainboard driven by a chain gear, a plurality of cone gears rotatable on a plurality of shafts fixed on the mainboard respectively, and a sun gear rotatable with an input shaft of a wheel. Also disclosed is a variable transmission gearing system including a sprocket mounted on a sprocket mount, a cone driver rotatable with the sprocket mount, a plurality of cone gears rotatably mounted between the cone driver and a cone holder, a driven pad frictionally engaged and rotatable with the cone gears, a main shaft rotatable with the driven pad, and a shifting shaft frictionally engaged and rotatable with the cone gears.
Claims20
A variable transmission gearing system for a bicycle, the system comprising:
- (a) a mainboard driven by a chain gear;
- (b) a plurality of cone gears rotatable on a plurality of shafts fixed on the mainboard respectively, each cone gear comprising a ratio gear and a driven gear, the driven gear being meshed with a first internal spur gear mounted in a gear box;
- and
- (c) a central sun gear rotatable with an input shaft of a wheel for driving the wheel to rotate, the sun gear being meshed with the ratio gears of the cone gears, and adapted to be shifted in an axle direction along the input shaft by a plurality of threaded rods;
- wherein when the chain gear is rotated anticlockwise, the mainboard and the cone gears rotate anticlockwise and drive the sun gear and the input shaft to rotate clockwise.
A variable transmission gearing system for a bicycle, the system comprising:
- (a) a sprocket mounted on a sprocket mount;
- (b) a cone driver rotatable with the sprocket mount;
- (c) a plurality of cone gears rotatably mounted between the cone driver and a cone holder coupled with the cone driver, each cone gear comprising a major conical surface and a minor frusto-conical surface formed at a larger end of the major conical surface;
- (d) a driven pad frictionally engaged and rotatable with the frusto-conical surfaces of the cone gears;
- (e) a main shaft of a wheel rotatable with the driven pad;
- and
- (f) a shifting shaft having at one end thereof an outwardly extending annular flange frictionally engaged and rotatable with the conical surfaces of the cone gears at a plurality of contact points, wherein the shifting shaft is shiftable in an axle direction by a set of gears to thereby change the position of the contact points.
Dependencies are inferred from the claim text.