| 摘要 |
<p>PURPOSE: To provide durability of a bladder without causing abnormal deformation even when abrupt fluid pressure is applied thereto by forming a thick portion whose thickness is gradually increased from a flexible part to a center on a bladder. CONSTITUTION: A bladder 2 is formed on a thick portion 4 whose thickness of a bottom is increased gradually from a flexible part 3 to a center. A natural form of the thick portion 4 is inverted to the side of an installation part 5 in a bent form. The inverted thick portion 4 is formed as indicated by the drawing at the time of formation. It is, while being elastically deformed, press- fitted to an inner peripheral surface of a shell 8 by a fluid pressure. When fluid is applied thereto from a fluid port, a free form as an original makes the thick portion 4 be semi-spherically inverted in an applying direction of the fluid. The thick portion is so formed that its thickness is increased from a thin flexible part to the center. Even when the fluid pressure is applied in a pulsative motion, it is deformed normally as in an original form. The bladder 2 is prevented from abutting against the inner peripheral surface of the shell 2 and abrading.</p> |
