Patent ID: 8876645

Claim:
An oil-pressure control device for controlling pressure of working oil to be supplied to an automatic transmission apparatus, which has multiple friction elements for carrying out an automatic transmission operation by engagement or dis-engagement of the friction elements when receiving the working oil, comprising: a housing; a coupling unit, one end of which is connected to a range selecting unit for selecting one of shift ranges, and the other end of which is inserted into the housing for transmitting the shift range selected by the range selecting unit by a rotational or a straight movement; a position detecting unit accommodated in the housing and connected to the other end of the coupling unit, the position detecting unit having a slider moving in tandem with the coupling unit, the position detecting unit further having a sensor body fixed to an inner wall of the housing for movably accommodating the slider so that the slider moves in a reciprocating manner, and the position detecting unit detecting a relative position of the slider to the sensor body; an oil-passage changing unit accommodated in the housing and connected to the other end of the coupling unit, the oil-passage changing unit having a spool moving in tandem with the coupling unit, the oil-passage changing unit further having a valve body fixed to the sensor body for movably accommodating the spool so that the spool moves in a reciprocating manner in the valve body, and the oil-passage changing unit changing oil-passage through which the working oil flows in accordance with a relative position of the spool to the valve body; a first positioning unit for positioning the sensor body to the housing; and a second positioning unit for positioning the valve body to the sensor body.