| 摘要 |
<p>The piston (1) bears a continuous annular packing (6) which fills the groove (7) and is made from a semi-solid but slightly deformable material. Means tending to cause the packing (6) to leave the groove (7), and lubrication means (19, 25, 28, 34), maintain a film of oil between the inner wall (3) of the cylinder (2) and the outer cylindrical wall of the packing (6). <IMAGE></p> |
