| 摘要 |
PURPOSE:To prevent a valve body from vibrating by installing a pin, enterable into a dead-end groove from a through groove on a valve port inner wall, on the circumference of a valve stem projectingly, in case of an on-off timing control valve for an exhaust port. CONSTITUTION:A recess 24 ranging to a shaft hole 23 is formed in one end face of a valve body. In a valve port inner wall, there are provided with a through groove 25, which extends as far as the other end face of the valve body 17 from a bottom surface of the recess 24, and a dead-end groove 26 extending as far as an intermediate part of the shaft hole 23 from the bottom surface of the recess 24. A pin 27, enterable into the dead-end groove 26 from the through groove 25 by way of the recess 24, is projectingly installed on the circumference of a valve stem 19. A lock collar 32 is screwed in this valve stem tight and the pin 27 is kept in a state of contact with a blind part of the dead-end groove 26. In such manner, any lost motion lying between the valve body and the valve stem is brought to naught, thus the valve body can be prevented from vibrating.
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