| 摘要 |
<p>A free-piston engine having a fluid pressure unit comprises a cylinder (1) and a piston (2) arranged within the cylinder (1) and reciprocating therein between the bottom dead centre and the top dead centre. The piston (2) includes a plunger-shaped piston extension (8) cooperating with the fluid pressure unit. This fluid pressure unit is equipped with an auxiliary means for moving the piston in a direction to its bottom dead centre. This auxiliary means comprises a connecting channel adapted to communicate a liquid pressure source with a room in which the plunger-shaped piston extension (8) extends and which room is closed on one side by an axial face of the piston extension which is directed such that, by pressure loading the axial face, the piston (2) is moved towards the bottom dead centre. According to the invention said axial face is formed on a ring (45) slidably arranged on the plunger-shaped extension (8), said plunger-shaped extension comprising a stop adapted for engagement by the ring (45) when it is moved for displacing the piston (2) to its bottom dead centre.</p> |
