| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydraulic pump capable of preventing leak oil from leaking to the outside due to the breakage of a seal member even when the amount of the leak oil is increased while securing lubricity between bushes and a drive shaft. <P>SOLUTION: This hydraulic pump comprises a pump housing 3 in which a through-hole 3a is formed, a pump unit 1 installed between the pump housing 3 and a pump cover 2, the drive shaft 15 pivotally supported in the through-hole 3a through the bushes 13 and 14, a seal chamber 11 formed at the end of the through-hole 3a, and the seal member 12. Also, the hydraulic pump comprises a first oil groove Y1 formed between the drive shaft 15 and the bushes 13 and 14 and allowed to communicate with the seal chamber 11 from the pump unit side of the through-hole 3a, a second oil groove Y2 allowed to communicate with the seal chamber 11 from the pump unit side of the through-hole 2a so as to avoid the first oil groove Y1, and a communication passage 19 communicating from the seal chamber 11 to the low-pressure side (low-pressure chamber 3c) of the pump unit 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
