| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To control the inflow of blow-by gas into a hollow piston. <P>SOLUTION: A piston 8 is equipped with a second chamber 20 provided to the inside of a cylindrical piston body 8a, a second communication hole 21 which is formed by passing through the peripheral wall of the piston body 8a to communicate between the second chamber 20 and the outside of the piston body 8a and which can communicate with a first communication hole 17, and a trench 41 recessively provided around the second communication hole 21 on the outer peripheral surface of the piston body 8a. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
