| 摘要 |
PROBLEM TO BE SOLVED: To provide a PCV valve which enables improvement of the sealability when the valve is closed to prevent back flow.SOLUTION: A PCV valve 10 includes: a case 12; a valve body 14; and a valve spring 16. A blow-by gas, which re-flows from a crank chamber of an internal combustion engine to an intake passage, flows in the case 12. The valve body 14 is provided in the case 12 so as to move in an axial direction and adjusts a flow rate of the blow-by gas. The valve spring 16 is formed by a coil spring which biases the valve body 14 in a valve closing direction. A valve seat part 23 having a blow-by gas inlet hole 25 is provided at the case 12. A flange part 32 which is seated on or separates from the valve seat part 23 is provided at the valve body 14. A valve seat surface, in which an inner diameter increases toward the flange part 32 side, is formed at the valve seat part 23. A valve part surface having a shape, which makes line contact with the valve seat surface when the valve is closed, is formed at the flange part 32.SELECTED DRAWING: Figure 1 |
