| 摘要 |
PROBLEM TO BE SOLVED: To provide a solenoid valve device for controlling the clutch pressure of an automatic transmission, in which hydraulic pressure characteristics are made to have two-step characteristics by changing a feedback force that acts on the valve. SOLUTION: A valve sleeve 19 housing a spool 20 is provided with a supply port 55, to which a hydraulic oil is supplied, a discharge port 54, from which the hydraulic oil is discharged, and an output port 53, which is provided between the supply port and the discharge port to output control pressure controlled by the displacement of the spool. Two, first and second, feedback parts 45, 47, which have a difference in areas on which the control pressure acts, are provided on the spool. When the spool is slid by a predetermined amount by the attractive force of a solenoid coil 17 resisting to an urging force of an urging member 59, one of the first and second feedback parts communicates with a drain port 56. COPYRIGHT: (C)2009,JPO&INPIT
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