Hydraulic transmission coupling apparatus

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Speed responsive device for adjusting relative rotational... – Actuated by fluid or electricity

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Details

180248, 192 60, 464160, F16D 3102, B60K 1735

Patent

active

050748254

ABSTRACT:
A hydraulic transmission coupling apparatus which is used instead of a center differential or a viscous coupling being usually mounted between a front wheel drive shaft and a rear wheel drive shaft of a four-wheel drive vehicle, and transmits driving force existing between the two shafts. The hydraulic transmission coupling apparatus is provided with a vane-type hydraulic pump which generates hydraulic pressure corresponding to a relative rotation speed difference of the two drive shafts and a variable throttle valve being disposed in the passage connecting a discharge port of the hydraulic pump with a tank, whose opening area varies according to the hydraulic pressure generated by the hydraulic pump, thereby driving force to be transmitted being increased or decreased steeply as the rotation speed difference becomes larger.

REFERENCES:
patent: 4676336 (1987-06-01), Hiramatsu et al.
patent: 4727966 (1988-03-01), Hiramatsu et al.
patent: 4829769 (1986-05-01), Hiramatsu
patent: 4850447 (1989-07-01), Hirakushi et al.
patent: 4881626 (1987-11-01), Hiramatsu
patent: 4940125 (1990-07-01), Sato et al.

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