Apparatus for controlling hydraulic pressure for clutch

Details Apparatus for controlling hydraulic pressure for clutch Apparatus for controlling hydraulic pressure for clutch

1991-04-29

1992-12-08

Lorence, Richard

192 clutches and power-stop control

Clutches

Operators

192 8711, 192109F, F16D 2511

Patent

active

051689731

ABSTRACT:
The present invention provides an apparatus for controlling a hydraulic pressure usable for a clutch wherein the appratus is employed for a transmission mounted on a construction machine or the like in such a manner that it is provided separately for a plurality of clutches 1 and it is controlled individually. The apparatus includes a first valve 3 for allowing a large amount of hydraulic oil to flow in the clutch and a second valve 4 for electronically controlling a clutch pressure so that the termination of filling and the clutch pressure are detected by a simple structural arrangement on the basis of a displacement of a spool 21 for the first valve 3 and a separately disposed piston. In addition, appearing of an overshoot pressure on the termination of filling is prevented by providing a difference in pressue receiving areas on the spool 21 for the first valve.

REFERENCES:
patent: 3566716 (1971-03-01), Chatterjea
patent: 3618424 (1971-11-01), Golan et al.
patent: 3722646 (1973-03-01), Oguma
patent: 3809201 (1974-05-01), Miyanishi et al.
patent: 3874255 (1975-04-01), Minami
patent: 3991865 (1976-11-01), Komatsu
patent: 4000795 (1977-01-01), Patton
patent: 4086994 (1978-05-01), Hirosawa et al.
patent: 4465168 (1984-08-01), Sato
patent: 4531433 (1985-07-01), Suga

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