Patent ID: 8038553

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 clamping oil pressure control valve that supplies a clamping oil pressure that controls a belt clamping pressure of the belt-driven continuously variable transmission to a driven-side pulley of the belt-driven continuously variable transmission; wherein control of the line oil pressure control valve is performed with a control oil pressure of a first electromagnetic valve that controls the clamping oil pressure control valve, and a control oil pressure of a second electromagnetic valve that controls engagement/release of the lockup clutch, the apparatus further comprising: a switching means provided between the line oil pressure control valve and the second electromagnetic valve, the switching means being capable of switching between supplying the control oil pressure of the second electromagnetic valve to the line oil pressure control valve, and supplying the control oil pressure of the second electromagnetic valve to a lockup control valve that is switched when controlling engagement/release of the lockup clutch; wherein the switching means, when engaging the lockup clutch, is switched so as to supply the control oil pressure of the second electromagnetic valve to the lockup control valve, and at other times, is switched so as to supply the control oil pressure of the second electromagnetic valve to the line oil pressure control valve.