Patent ID: 7426912

Claim:
An oil supply circuit for a cylinder deactivation system, comprising: a hydraulic pump; a plurality of tappets for controlling opening of intake and exhaust valves; a first oil circuit connected to the hydraulic pump through an oil supply line and supplying a high pressure oil to the tappets, wherein the first oil circuit comprises a first high pressure supply circuit for supplying the high pressure oil to the tappets of first and second cylinders, and a second high pressure supply circuit for supplying the high pressure oil to the tappets of third and fourth cylinders, wherein the first high pressure supply circuit is connected to the second high pressure supply circuit through an oil bifurcation line bifurcated from the oil supply line; and a second oil circuit connected to the hydraulic pump and supplying oil to the tappets, wherein the second oil circuit comprises an oil line formed in a hollow space of a cam shaft; wherein the first high pressure supply circuit comprises: a first control valve connected to the oil supply line and controlling an oil supply; a first exhaust-side oil supply line connected to the first control valve and supplying an oil to the exhaust-side tappets of the first and second cylinders; and a first intake-side oil supply line connected to the first control valve and supplying the oil to the intake-side tappets of the first and second cylinders.