192 clutches and power-stop control – Transmission control and clutch control – Common control
Patent
1990-07-31
1992-01-28
Bonck, Rodney H.
192 clutches and power-stop control
Transmission control and clutch control
Common control
192 362, 192 83, B60K 4122, F16D 2514
Patent
active
050836463
ABSTRACT:
A hydraulic device for operating a clutch in an industrial vehicle having a transmission comprising shift changeable gears and manually operated shift levers. Gear actuating hydraulic boosters are provided for hydraulically actuating the shift changeable gears, and the clutch is actuated by a clutch cylinder. The hydraulic device comprises a clutch circuit extending between a hydraulic pump and the clutch cylinder, and a booster circuit extending between the hydraulic pump and the boosters. A gate valve is arranged in the clutch circuit and is movable in response to pressure of hydraulic oil in the booster circuit, so that the normally closed gate valve is opened when the manually operable shift levers are operated. Also, a pressure control circuit is branched from the clutch circuit and again branched into parallel third and fourth hydraulic circuits. A forward and reverse gate valve and a speed change gate valve are arranged in the third and fourth hydraulic circuits, respectively. A check valve and a first accumulator are arranged in the third hydraulic circuit and a second accumulator is arranged in the second hydraulic circuit upstream of the second gate valve for controlling the use of pressure applied to the clutch cylinder.
REFERENCES:
patent: 2272571 (1942-02-01), Maybach
patent: 3262523 (1966-07-01), Gordon
patent: 3352392 (1967-11-01), Black et al.
patent: 3438469 (1969-04-01), Hilpert
patent: 3459285 (1969-08-01), Lamburn et al.
patent: 4146120 (1979-03-01), Stevens
patent: 4585100 (1986-04-01), Sugano
patent: 4662493 (1987-05-01), Aoki et al.
Association of Agricultural Machinery, 1988, Japan.
Ohta Shuji
Takeuchi Toshiyuki
Bonck Rodney H.
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
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