| 摘要 |
<p>A hydraulic to pneumatic power transfer unit which converts a high pressure oil flow into a flow of high pressure air by means of three stages of piston pumps. The first stage includes a pair of linked pistons (11,14) of substantially equal size, both supplying air to a second stage piston (15) which is directly linked to a third stage piston (18) so that the pair of second and third stage pistons work alternately with the pair of first stage pistons. A linkage between each pair of pistons actuates spool valves (40,41) which control the motion of the other pair of pistons. A second embodiment includes an internal oil reservoir (34) and a swash-plate pump (70) that may be powered by a rotating shaft instead of a flow of oil. The pulses of oil produced by the swash-plate pump directly control the piston pairs without the need for spool valves.</p> |
