Four-wheel-driving system having a continuously variable sub-tra

Details Four-wheel-driving system having a continuously variable sub-tra Four-wheel-driving system having a continuously variable sub-tra

1987-04-14

1988-12-27

Staab, Lawrence

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74665T, 74740, F16H 3710

Patent

active

047932090

ABSTRACT:
An improved four-wheel-driving system transmitting driving power to front and rear wheels which includes a viscous coupling, a sub-transmission of a continuously variable type coupled to one of the driving axles, and an actuator variably controlling the change gear ratio of the sub-transmission to control the ratio of driving power distributed between the front and rear wheels. The power distribution ratio is changed suitably to both the driving conditions and the road surface conditions. Further this four-wheel-driving system is lightweight and with low vibration in comparison with the conventional type using a center differential.

REFERENCES:
patent: 3869013 (1975-03-01), Pagdin et al.
patent: 4040271 (1977-08-01), Rolt et al.
patent: 4562897 (1986-01-01), Renneker
patent: 4576061 (1986-03-01), Yamakawa et al.
patent: 4669559 (1987-06-01), Fukui
patent: 4672861 (1987-06-01), Lanzer
patent: 4676336 (1987-06-01), Hiramatsu et al.
patent: 4682518 (1987-07-01), Takada et al.
patent: 4703842 (1987-11-01), Leinfellner et al.
patent: 4714129 (1987-12-01), Mueller
patent: 4715467 (1987-12-01), Sakai
All-Wheel Drive On-and Off-Road Requirements for Future All Wheel Drive Systems in Different Ranges of Application, by H. Lanzer, presented at the International All Wheel Drive Conference, 5-6 Mar. 1986, at The Institution of Mechanical Engineers.

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