| 摘要 |
<p>PURPOSE:To make a working fluid lubricate a seal and increase the durability of said seal while prevent a working fluid from outwardly leaking from a discharging part by providing a sealing chamber which is connected to a suction passage, in between two seals. CONSTITUTION:A holding member 4 holds the cylinder 3 of a pump for a working fluid of a liquid agent, etc. A first sealing means 30 is provided being faced to a discharging part 21 on a piston 7 side, in between the holding member 4 and the small diameter part 8 of a piston rod 11. Further, a second sealing means 22 is provided on the crankshaft side of the first sealing means 30 via a sealing chamber 31. This sealing chamber 31 is connected between the suction port 20 and suction passage 19 of the pump, and returns a working fluid which has leaked out of the discharging part 21 to a suction side while enables lubrication by means of the working fluid.</p> |
