| 摘要 |
<p>A piston (90) comprising hydrodynamic skirts (30) and crowns (20), pressure actuated sealing rings (70") of fixed excursion or balanced by hydrodynamic reactions, or no rings at all, stringent temperature control, ample oil on the cylinder wall even near top-dead-center, characterized by absence of abrasion between piston and cylinder and much lower friction, resulting thereby, in higher fuel economy and longer engine life. </p> |
