公开(公告)号：US20010037834A1

公开(公告)日：2001-11-08

申请号：US09902565

申请日：2001-07-12

Applicant: NHK SPRING CO., LTD

Inventor： Takeyoshi Shimbori ,  Chiharu Umetsu ,  Kouji Nakamura ,  Hiroshi Mizukami ,  Naoki Ueno

IPC: F16L055/04 ,  B21D051/16

CPC classification number: B23K11/002 ,  B23K11/14 ,  F15B1/103 ,  F15B1/22 ,  F15B2201/205 ,  F15B2201/312 ,  F15B2201/3151 ,  F15B2201/3153 ,  F15B2201/3158 ,  F15B2201/411 ,  F15B2201/415 ,  F15B2201/60 ,  Y10T29/49394 ,  Y10T29/49877 ,  Y10T29/49893

Abstract: Disclosed is an accumulator comprising: a pressure vessel; an elastic bellows in which a compressed gas is sealed, an end of the bellows being fixed to an interior of the pressure vessel; a flow path having an opening communicating with the interior and an exterior of the pressure vessel; a valve connected to a movable end of the bellows to operatively close the opening according to elastic motion of the bellows; and a hydraulic chamber partitioned from a gas chamber formed in an interior of the bellows containing the compressed gas. The valve comprises an upper surface which can cover the opening, and plural circular protrusions which surround the entire circumference of the opening and can closely contact the circumference of the opening.