| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a structurally simple negative pressure booster for firmly receiving a key member without using a special stopper plate. <P>SOLUTION: This negative pressure booster includes a key stopper means S for axially adjacently installing a seal member 13 brought into close contact with an outer peripheral surface of a valve cylinder 10 and a bearing bush 9 for slidably supporting the outer peripheral surface of the valve cylinder 10 in a support cylinder part 12 of a rear wall of a booster shell 1 and regulating a retreat limit of a booster piston 4 and an input rod 20 by receiving the key member 32 installed in the valve cylinder 10. The support cylinder part 12 is formed with a seal housing 12a for storing the seal member 13 and a bearing housing 12b of a large diameter continuing with its front end via an annular shoulder part 12be. The bearing bush 9 is stored and held by this bearing housing 12b, and the key member 32 is received by constituting the key stopper means S of this bearing bush 9 and the annular shoulder part 12be. <P>COPYRIGHT: (C)2011,JPO&INPIT |
