Hydraulic drive system for bicycles and the like
First Claim
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1. A hydraulic drive system for bicycles, comprising:
- a casing adapted for enclosing a hanger portion of a bicycle;
a rotatable crankshaft extending through said casing;
planetary gear type speed up gears including a carrier which is integral with said crankshaft so as to rotate in unison with said crankshaft, a sun gear rotatably disposed on said crankshaft, and a plurality of planetary gears supported and driven by said carrier, said plurality of planetary gears engaging said sun gear to transmit an increased rotational speed to said sun gear with respect to said crankshaft;
an eccentric cam assembly including an outer eccentric cam and an inner eccentric cam driven by said sun gear of said speed up gears; and
a variable displacement hydraulic pump having plungers driven by the outer eccentric cam of the cam assembly and provided at an input portion of the drive system, said speed up gears, said eccentric cam assembly and said variable displacement hydraulic pump being housed in said casing.
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Abstract
A hydraulic drive system for bicycles and the like comprises a casing adapted for enclosing a hanger portion of the bicycle, planetary gear type speed up gears including a carrier integral with a crankshaft for increasing the number of rotations of the crankshaft, an eccentric cam assembly including an outer eccentric cam and an inner eccentric driven by a sun gear of the speed up gears and a variable displacement hydraulic pump having plungers driven by the cam assembly and provided at an input portion of the driving system, the speed up gears, the eccentric cam assembly and the variable displacement hydraulic pump being housed in the casing.
214 Citations
6 Claims
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1. A hydraulic drive system for bicycles, comprising:
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a casing adapted for enclosing a hanger portion of a bicycle; a rotatable crankshaft extending through said casing; planetary gear type speed up gears including a carrier which is integral with said crankshaft so as to rotate in unison with said crankshaft, a sun gear rotatably disposed on said crankshaft, and a plurality of planetary gears supported and driven by said carrier, said plurality of planetary gears engaging said sun gear to transmit an increased rotational speed to said sun gear with respect to said crankshaft; an eccentric cam assembly including an outer eccentric cam and an inner eccentric cam driven by said sun gear of said speed up gears; and a variable displacement hydraulic pump having plungers driven by the outer eccentric cam of the cam assembly and provided at an input portion of the drive system, said speed up gears, said eccentric cam assembly and said variable displacement hydraulic pump being housed in said casing. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification