| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve suction efficiency of a working fluid, by preventing leakage of the working fluid between adjacent cylinder bores 8. <P>SOLUTION: Partition parts 31a and 31b narrower in an interval between a shaft hole 13 and the whole cylinder bores 8 than an interval of the inter-bore narrowest part 8a between the adjacent cylinder bores 8, are arranged on the periphery of the shaft hole 13 penetrating through a crankcase 15 and the rear end side. A bypass groove 32 in which a high pressure fluid leaked from the cylinder bores 8 flow, is arranged on a rear end surface 1a of a cylinder block 1. This bypass groove 32 is arranged in the inter-bore narrowest part 8a between the cylinder bores 8, and extends up to the shaft hole 13 and a bolt penetrating hole 14 communicating with the crankcase side. Thus, when the high pressure fluid leaks from the cylinder bores 8, the high pressure fluid flows in the shaft hole 13 via the narrow partition part 31a, and also flows in the bypass groove 32, and flows out to the crankcase side via the shaft hole 13 and the bolt penetrating hole 14. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
