| 摘要 |
A screw separation preventing structure of a vis valve is provided to prevent damage to an engine due to separation of a screw by preventing separation of the screw fixing the vis valve. A vis valve(1) is installed in a runner of a surge tank. A screw separation preventing structure of the vis valve preventing separation of a screw(4) is installed in the vis valve. A separation preventing section(10) is formed in a screw hole(6) with which the screw is engaged. The separation preventing section protrudes upward toward the upper side of the vis valve. At least two separation preventing sections are provided. The lower surface of a head of the screw makes surface-contact with the upwardly protruding separation preventing section. If the screw is rotated, the head of the screw presses the separation preventing section downward. If the separation preventing section is gradually pressed, a bent portion of the separation preventing section gathers to the center of the screw hole.
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