Nidec Tosok Corporation

Subaru Corporation

Kunio Kimpara

Mamoru Murakami

Hiroaki Kosugi

Masayuki Nojo

A hydraulic control apparatus includes an output-side oil passage into which oil from a first oil passage and oil from a second oil passage flow, and a pressure regulating check valve regulating a hydraulic pressure in the second oil passage. The pressure regulating check valve includes first and second elastic portions housed in a spool hole between a valve body and a bottom of the spool hole. A natural length of the second elastic portion is shorter than a distance between the valve body and the bottom when the valve body closes an inflow hole. The second elastic portion applies an elastic force to the valve body in a state in which the valve body opens the inflow hole.

Hydraulic control apparatus

In a hydraulic control device, a first valve device is brought into an open state when a first value obtained by subtracting a value of a pressure in the first output side oil passage from a value of a pressure in the second output side oil passage is equal to or larger than a first threshold value. A second valve device is brought into an open state when an oil pressure in a third connection oil passage is equal to or larger than a second threshold value, and is brought into a closed state when the oil pressure in the third connection oil passage is smaller than the second threshold value. The first value is equal to or larger than the first threshold value and the first valve device is in the open state when the second valve device is in the closed state.

Hydraulic control device

A spool valve includes a valve portion that opens and closes a portion between an input port and an output port and a radial-direction-position changing portion provided in an outer lateral surface of the valve portion in a radial direction. When a first value is equivalent to or larger than a threshold that is larger than 0, the portion between the input port and the output port are opened to permit a flow of the oil inside the first connection oil passage, and when the first value is smaller than the threshold, the portion is closed to block the flow of the oil inside the first connection oil passage. The radial-direction-position changing portion extends in the axial direction, and a position thereof in the radial direction changes inwardly from a first side towards a second side in the axial direction.

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Zama, Japan

Kunio Kimpara