| 摘要 |
PURPOSE:To prevent the flow rate of blowby gas ventilation from being increased when an engine runs at high lands by making the cross sectional area of a blowby gas ventilation passage smaller as atmospheric pressure is lowered. CONSTITUTION:A housing 201 of a control valve 200 is formed with a blowby gas ventilation passage chamber 210 which is connected with both a blow-bye opening of a cylinder head and a blow-bye opening provided to the halfway of an intake passage through a blowby gas ventilation passage 152. And a control rod is provided to the opposite side of the opening side of the cylinder head side of the blowby gas passage chamber 210. A vacuum bellows 202 is expanded as atmospheric pressure is lowered for moving the control rod 220 to the closed position overcoming the energized force of a spring 240. As a result, the cross sectional area of the blowby gas ventilation passage is decreased as a land becomes high in altitude. |
