Motor vehicles – Special wheel base – Having only two wheels
Patent
1996-03-20
1998-06-02
Butler, Douglas C.
Motor vehicles
Special wheel base
Having only two wheels
180206, 180 652, 180 658, B62M 712
Patent
active
057587361
ABSTRACT:
A power assist apparatus of a power assisted bicycle comprises a crank shaft extending in the transverse direction of the body of the bicycle and rotatably driven by a footpedal-propelling, an electric motor for generating an assist power, a power composition shaft rotatably supported and extending in parallel with the crank shaft, a footpedal-propelling power transmission mechanism for transmitting the footpedal-propelling power to the power composition shaft at a right angle to the axis of the power composition shaft, an assist power transmission mechanism for transmitting the assist power to the power composition shaft at a right angle to the axis of the power composition shaft in the direction opposite to the direction in which the footpedal-propelling power is transmitted, a power composition output mechanism for outputting the rotating power of the power composition shaft to a driven wheel, a moment sensor for sensing a moment difference between two moments acting on the power composition shaft from two opposite directions when the footpedal-propelling power and the assist power are transmitted, and a control unit for calculating the assist ratio of the assist power to the footpedal-propelling power based on the magnitude and direction of the moment difference coming in from the moment sensor and controlling the output of the electric motor so that the assist ratio is kept at a constant ratio.
REFERENCES:
patent: 3773131 (1973-11-01), Jaulmes
patent: 4637274 (1987-01-01), Goldenfeld
patent: 5375676 (1994-12-01), Takata et al.
patent: 5474148 (1995-12-01), Takata
patent: 5570752 (1996-11-01), Takata
Butler Douglas C.
Kananen Ronald P.
Suzuki Kabushiki Kaisha
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