Patent ID: 6994228

Claim:
An accumulator comprising: an outer shell ( 1 ) branched from and connected to a piping via a pressure introduction port ( 2 ); and a bladder ( 3 ) separating an internal space of the outer shell ( 1 ) into a pressure introduction chamber ( 4 ) in the side of the pressure introduction port ( 2 ) and a gas chamber ( 5 ) in the opposite side, wherein the bladder ( 3 ) has a laminated structure constituted of a gas shielding layer ( 327 ), an inner elastic layer ( 328 ) in an outer side thereof, an outer elastic layer ( 329 ) in a further outer side thereof and a rubber layer ( 31 ) in a more further outer side thereof, the gas shielding layer ( 327 ) and the inner elastic layer ( 328 ) are made of a polyamide resin, and the outer elastic layer ( 329 ) is made of an ester based elastic plastic.