Power transmission apparatus for vehicle of four-wheel drive typ

Details Power transmission apparatus for vehicle of four-wheel drive typ Power transmission apparatus for vehicle of four-wheel drive typ

1989-01-24

1989-11-21

Wright, Dirk

192 clutches and power-stop control

Clutches

Fluent material

180248, F16D 3102

Patent

active

048816264

ABSTRACT:
A power transmission apparatus for a four-wheel drive vehicle has a first rotary shaft for transmitting drive force to front wheels of the vehicle, a second rotary shaft for transmitting drive force to rear wheels of the vehicle, and a hydraulic pump connecting the first and second rotary shafts and driven by a difference in rotational speed between the first and second rotary shafts to deliver hydraulic oil in an amount depending on the difference in rotational speed. A suction passage and a delivery passage is changed over in dependence on relative rotational direction of the first and second rotary shafts. An expansion chamber communicates with the suction passages and delivery through a restriction to temporarily suppress an increase in pressure of hydraulic oil delivered from the hydraulic pump, thereby suppressing transmission of a drive force by the hydraulic pump when the variation in relative rotation speed between the first and second rotary shafts is small.

REFERENCES:
patent: Re28324 (1975-01-01), Greene
patent: 2595479 (1952-05-01), Nelson
patent: 3272276 (1966-09-01), Budzich
patent: 3447619 (1969-06-01), Nodwell et al.
patent: 3680652 (1972-08-01), Greene
patent: 4272993 (1981-06-01), Kopich
patent: 4541503 (1985-09-01), Akutagawa et al.
patent: 4572318 (1986-02-01), Cady
patent: 4618022 (1986-10-01), Hayashi
patent: 4676336 (1987-06-01), Hiramatsu et al.

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