| 摘要 |
<P>PROBLEM TO BE SOLVED: To effectively prevent abrasion of a slide contact part of a rubber end lip caused by increase in a pressure of sealed fluid in an early stage. <P>SOLUTION: A high pressure side pressure P<SB>1</SB>in a sealed fluid chamber 21 is introduced into an intermediate empty chamber 15 between a first seal part 51 and a second seal part 52 by a pressurizing means Y while reducing the pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT |
