Motorcycle with adjustable-power front wheel drive (all wheel dr

Details Motorcycle with adjustable-power front wheel drive (all wheel dr Motorcycle with adjustable-power front wheel drive (all wheel dr

1997-02-28

1999-04-20

Graham, Matthew C.

Motor vehicles

Special wheel base

Having only two wheels

180247, 60436, 192103R, 477175, B62D 6102

Patent

active

058949038

ABSTRACT:
A two wheel drive motorcycle is provided with an unsteerable rear wheel, a steerable front wheel, a drive unit having a driving motor for driving the rear wheel and a transmission device coupled to the drive unit for driving the front wheel. The transmission device has a hydrostatic drive having a hydraulic pump driven by the driving motor and whose hydraulic motor is mounted on an arm of the front fork. The hydraulic pump has constant output and the hydraulic motor has a constant input matched to the pump output. Hydraulic fluid is delivered from the hydraulic pump to the hydraulic motor by a pressure line. The pressure in the pressure line is controlled by a pressure control valve which can be adjusted to maintain a pressure in the range of approximately 20 to 200 bars. A check valve redirects the hydraulic fluid from the pump to a return line back to the pump when the rotational speed of the rear wheel is a predetermined amount, preferably in the range of 1%-3%, faster than the rotational speed of the rear wheel allowing the front wheel to freely rotate. When the rotational speed of the rear wheel is greater than the predetermined range, the check valve allows the hydraulic fluid to drive the hydraulic motor for driving the front wheel.

REFERENCES:
patent: 4157739 (1979-06-01), Frye
patent: 4684143 (1987-08-01), Sato
patent: 5360381 (1994-11-01), Swist
patent: 5644916 (1997-07-01), Hayasaki
"PS--Die Motorrad Zeitung", No. 9, Sep. 1976, pp. 10-12.

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