| 摘要 |
PURPOSE:To increase pump efficiency and reduce installation cost, by providing a seal block for each gear engagement part which drives a pair of cylinder blocks, pressing the seal block onto the engagement part by means of a spring and thereby operating pumping. CONSTITUTION:When input shaft 8 and gears 5, 5 are rotated, pistons 4, 4, rotating together with cylinder blocks 3, 3, make reciprocating motion and eject compressed fluid from ejection ports 12, 12 to the ejection circuit. At this time, seal block 13 is pressed onto the engagement part 14 of gears 5, 5 by the force of spring 18 and seals the end of the gears so that efficient pumping is operated. When the load pressure on the ejection circuit rises and the force on projecting edge 20 exceeds the elastic force of spring 18, seal block 13 moves away from the engagement part 14, so that the distance between groove 16 and the tooth end becomes large. Then pumping action ceases, and thereby overload is prevented. |
