Control device for direct clutch in automatic transmission

Details Control device for direct clutch in automatic transmission Control device for direct clutch in automatic transmission

1983-07-11

1986-10-21

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 331, 192 0092, 192 0076, F16D 2514, F16D 3300

Patent

active

046180370

ABSTRACT:
Disclosed is a control device for a direct clutch in a vehicular automatic transmission comprising: a fluid torque converter; an auxiliary transmission having plural stages of gear trains selectively connected to the output side of said torque converter, said gear trains having different gear-to-gear speed ratios, and a plurality of hydraulically operated frictional engagement means for actuating the gear trains; and a hydraulically operated direct clutch capable of directly coupling pump and turbine vane wheels of the torque converter together. The control device includes first and second branch passages extended from working fluid passages of one and another of the frictional engagement means, respectively, a first directional control valve interposed between the first branch passage as well as an oil tank and an intermediate passage, and a second directional control valve interposed between the second branch passage as well as the intermediate passage and a working fluid passage of the direct clutch. The control device thus constructed can make more comfortable and stable the vehicle travelling at the time of speed shifting operation and makes it possible to by far reduce fuel cost.

REFERENCES:
patent: 3857302 (1974-12-01), Morris
patent: 4051932 (1977-10-01), Arai et al.
patent: 4428259 (1984-01-01), Kubo et al.
patent: 4516671 (1985-05-01), Nishikawa et al.
patent: 4548307 (1985-10-01), Nishikawa et al.

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