| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problems in a blow-by gas passage for constituting a PCV system: when an intake port on the side of a cam chamber is opened in parallel to a camshaft and only on the side opposite the position of a blow-by gas hole, oil can be prevented from entering the blow-by gas passage, while a blow-by gas does not flow smoothly in a cam chamber, and the cam chamber side is ventilated poorly.SOLUTION: A blow-by gas passage structure includes: a passage arranged in a space between a cylinder head having a cam chamber for storing camshafts and a head cover for covering the cylinder head, to allow blow-by gas and fresh air to pass; a first opening arranged in the cylinder head and allowing the passage and the fresh air supply side to communicate with each other; and a second opening for allowing the cam chamber side and the passage to communicate with each other. The second opening opens toward the cam chamber, in a part for expanding the flow passage cross-sectional area of the blow-by gas passage arranged in a position not immediately above the camshaft. |
