| 摘要 |
<p>PURPOSE:To avoid erosion by a brake fluid and to increase accumulating capacity by using a gas-impermeable member which is constructed so that the second film formed of an ethylene-vinyl alcohol copolymer is stuck to the fluid chamber side of the first film formed of polyvinyl alcohol containing glyceline. CONSTITUTION:As the first film 12 formed of polyvinyl alcohol containing glyceline checks permeation of gas and exhibits large elongation even at a low temperature, even if the displacement of a bladder 2 is repeated, cracks will not be produced so as to prevent permeation of gas from a gas chamber 3 to the fluid chamber 4 side. The second film 13 formed by an ethylene-vinyl alcohol copolymer is not be attacked by a brake fluid containing ethylene glycol alkyl ethyers, so that the first film 12 easy to be eroded by the brake fluid can be protected by sticking the second film 13 to the fluid chamber 4 side of the first film 12. Furthermore, the elongation of a gas impermeable member 14 comprising the films 12, 13 is comparatively large, and the bladder 2 can be displaced in a comparatively large range, so that the accumulating capacity of an accumulator A can be increased.</p> |
