Patent ID: 7951026

Claim:
An oil pressure control apparatus comprising: a belt-driven continuously variable transmission in which a belt is clamped with oil pressure to transmit motive power, and a gear ratio is changed by changing a belt contact radius; a hydraulic lockup clutch provided in a hydrodynamic power transmission apparatus provided between a motive power source and the belt-driven continuously variable transmission, the lockup clutch directly coupling the motive power source side and the belt-driven continuously variable transmission side; a line oil pressure control valve that regulates a line oil pressure that becomes a source pressure of oil pressure of various parts; and a lockup control valve that is switched when performing engagement control or release control of the lockup clutch; wherein control of the line oil pressure control valve and control of the lockup control valve are performed with one electromagnetic valve, the control range of the line oil pressure control valve is set to a fixed range of a control oil pressure of the electromagnetic valve, and the control range of the lockup control valve is set to a remaining range, and between the line oil pressure control valve and the electromagnetic valve, a depressurizing valve is provided that, in the control range of the lockup control valve, can set an output oil pressure to the line oil pressure control valve to “0”.