| 摘要 |
<p>A tubular wall (1) has internal dividing walls (2,3,4) so as to form a number of cavities arranged around the inside of the tubular wall. A piston (8,9,10) occupies part of the space of each cavity and divides the free space of that cavity into first and second chambers. Each piston can rock so that its chambers expand and contract. A camshaft (11) or the like can rotate relative to the tubular wall and engage the pistons so as to transform rotary movement of the camshaft into rocking movement of the pistons or vice versa. A valve arrangement permits fluid to flow from an inlet into each chamber while that chamber is expanding and to flow from each chamber to an outlet while that chamber is contracting.</p> |
