Title:
カップシールおよびこれを用いたマスタシリンダ
Document Type and Number:
Japanese Patent JP4388838
Kind Code:
B2
Abstract:
In a cup seal of the present invention, an inner lip (27b) is pressed into close contact with a piston (9) and an outer lip(27c) is pressed into close contact with a bottom wall (26a) of a concavity (26) by fluid pressure developed in a fluid pressure chamber (11) when the piston (9) moves forward. Therefore, fluid pressure is sealed. When the piston (9) is retracted, the outer lip (27c) is deflected inwardly and is thus spaced apart from the bottom wall (26a) of the concavity (26). Hydraulic fluid of a reservoir is supplied to the fluid pressure chamber (11) through a first communication path (22), grooves (27e), and the space between the outer lip (27c) and the bottom wall (26a). As mentioned above, the inner lip (27b) has only the sealing function, while the outer lip (27c) has both the sealing function and the pumping function and ensures sufficient fluid supply by the grooves.
Inventors:
Shusaku Chiba
Application Number:
JP2004084963A
Publication Date:
December 24, 2009
Filing Date:
March 23, 2004
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
B60T11/16; F16J15/18; B60T11/232; B60T11/236; F16J15/16; F16J15/3236
Domestic Patent References:
| JP2003261020A | ||||
| JP58149608U |
Foreign References:
| US5328178 |
Attorney, Agent or Firm:
Kenji Aoki
Ryukichi Abe
Hirukawa Masanobu
Norihiko Uchida
Hideo Sugai
Hiroshi Nagisawa
Akira Yonezawa
Ryukichi Abe
Hirukawa Masanobu
Norihiko Uchida
Hideo Sugai
Hiroshi Nagisawa
Akira Yonezawa