Patent ID: 7318452

Claim:
An accumulator ( 1 ), comprising: a housing ( 2 ) including a bottomed tubular shell ( 3 ) having an end surface ( 35 ) in an open end portion; an end cover ( 4 ) with a step concave portion ( 35 ) radially overlapping and welded to said end surface ( 35 ) of said tubular shell ( 3 ) and including a fixing portion ( 30 ) received in said open end portion of said tubular shell ( 3 ), wherein a cross sectional inner outline ( 32 ) of a peripheral edge portion ( 31 ) of said end cover ( 4 ) is an oval shape which is concave; an operation member ( 5 ) including a metallic bellows ( 6 ) fixed to said fixing portion ( 30 ) formed in said end cover ( 4 ), wherein a pressure sealed chamber ( 8 ) and a pressure flow-in chamber ( 9 ) are formed by said operation member ( 5 ); and a spacer ( 41 ) installed in a space ( 40 ) formed by a line connecting both sides of one end portion of the metallic bellows ( 6 ) fixed to said fixing portion ( 30 ), such that no space is formed between the gas end cover ( 4 ) and the spacer ( 41 ).