| 摘要 |
PURPOSE:To prevent leakage of liquid in a cylinder instead of a piston ring, by providing a cylindrical rod between the cylinder and a piston, said rod rotating in tight contact with both the cylinder and the piston. CONSTITUTION:There are provided three cylindrical seal rods 3 rotating in contact with side surfaces of both a cylinder 1 and a triangular piston 2. Each of the seal rods 3 is provided with a pinion gear 4 at both ends thereof to rotate the pinion gear 4 together with the seal rods 3. There are provided each rack 5 on an inner wall of the cylinder and on a side wall of the piston at a position corresponding to that where the pinion gear 4 of the seal rod 3 is provided, so as to engage the rack 5 with the pinion gear 4 of the seal rod 3. An adjust ring 6 is inserted in the seal rod 3, so as to take into consideration expansion and contraction, or wear of the seal rod. |
