PURPOSE: To improve pump performance capable of increasing a pressure in an oil pressure tank of an aircraft to a maximum value with low-pressure air by using a mechanical AND gate to synchronize two oppositely reciprocating piston units.
CONSTITUTION: Pistons 12, 17 move outwardly from each other in response to an oil pressure in a chamber 52, accordingly any one of ports 45, 46 in association with piston shafts 20, 15 of AND gate means reaches a point closed by the shaft. However, increase of a pressure in this port is prevented by the other port connected to an oil pressure returning outlet 67. When both the ports 45 and 46 are closed, the oil pressure increases at an end D1 of a spool 32 from a passage 44. When this pressure increase reaches a point overcoming a magnetic force between a magnetic end stop member 34 and an end P1, the spool 32 is forcedly moved rightward, and the other end P2 is held by the magnetic stop member 34.
| JPS55117089 | AIR FEEDER |
JIYOFURII EDOWAADO BOON
AREN AANESUTO MATSUSHII
GAI EDOWAADO DEIBUISU
MAIKERU ARETSUKU KINGAMU
