| 摘要 |
PCT No. PCT/US82/01540 Sec. 371 Date Oct. 25, 1982 Sec. 102(e) Date Oct. 25, 1982 PCT Filed Oct. 25, 1982.A fluid control system (10) for selectively controlling two independent actuators or clutches (12, 14) has a pair of normally opened solenoid valves (62, 64) for controlling fluid pressure in a pair of actuating chambers (40, 42). This controls actuation of a pair of directional spools (36, 38) which in turn controls engagement and disengagement of the clutches (12, 14) such that failure of one of the solenoid valves to close properly would not allow engagement of the clutches. A common actuating chamber (44) is provided between the directional spools (36, 38) and in fluid communication with the first and second actuating chambers (40, 42) through orifices (58). The abutment of the first and second directional spools prevents simultaneous engagement of both clutches.
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