| 摘要 |
<p>PURPOSE: To restrain a noise due to rotation of a piston and abrasion of an interferential part. CONSTITUTION: A turning-stop projecting part 11 is formed on a back face of a neck part 9 of a single head piston 8. A turning-stop recessed part 12 is formed on an inner peripheral surface of a front housing 2. The turning-stop projecting part 11 is fitted in the turning-stop recessed part 12. Rotation restricting surface 12-1 and 12-2 are formed on both side surface of the turning- stop recessed part 12. Rotation restricing surface 11-1 and 11-2 are formed on both side surfaces of the turning-stop projecting part 11. The respective rotation restricting surfaces 11-1 , 11-2 , 12-1 and 12-2 are formed in parallel to the axis 8-1 of the single head piston 8, and made to coincide with a radial line 8-2 with the axis 8-1 as the center.</p> |
