Land vehicles – Wheeled – Occupant propelled type
Patent
1983-09-06
1985-10-15
Peters, Jr., Joseph F.
Land vehicles
Wheeled
Occupant propelled type
280259, 60452, 60491, B62M 1900
Patent
active
045469903
ABSTRACT:
A hydraulic drive system and a bicycle having such system as its drive train, the system including a pump, preferably a vane pump, operably connected to the bicycle pedal crank, the pump delivering pressurized fluid to a hydraulic motor operably connected to the wheel or mechanism to be driven, e.g., the bicycle drive wheel. The pump has an impeller eccentrically disposed in a housing, and a piston-cylinder mechanism is provided to change the eccentricity of the pump impeller with respect to the pump housing as a function of hydraulic system pressure, to thereby maintain a constant input force, e.g., pedal pressure, and rotation rate, for a wide range of speeds. The motor also has an impeller eccentrically disposed in a housing, and a spacer bar connected between the pump and motor housings automatically adjusts the motor impeller eccentricity with changes in the pump impeller eccentricity, thereby further maintaining constant pedal pressure and rotation rate for a wide range of speeds. A pretensioned spring opposes the movement of the piston in the cylinder, thereby requiring that a predetermined pedal pressure level be exerted before the pump and motor eccentricities will change. A lever is provided for manually setting, and varying, the pretension of the spring to thereby set the pedal pressure level at which the pump and motor impeller eccentricities will be charged.
REFERENCES:
patent: 485094 (1892-10-01), Dey et al.
patent: 1779757 (1930-10-01), Streckert
patent: 2564237 (1951-08-01), Segsworth
patent: 2716946 (1955-09-01), Hardy
patent: 4072443 (1978-02-01), Heath
patent: 4290621 (1981-09-01), Davey
Peters Jr. Joseph F.
Watts Charles R.
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