Patent ID: 7552912

Claim:
A fluid pressure device for converting energy of a working medium supplied to an interior of a pressure chamber into mechanical energy, the device comprising: a first load supporting member; a second load supporting member relatively movably incorporated into said first load supporting member and partitioning and forming said pressure chamber together with said first load supporting member; and a metallic seal ring provided with a first curve portion contacting with said first loading supporting member, a first curve portion formed so as to be axially shifted relative to said first curve portion and contacting with said second load supporting member, and a pressure receiving portion continuing into said first and second curve portions and converting pressure applied by said working medium into radial-directional forces of said first and second curve portions, the metallic seal ring being disposed in an end portion of said pressure chamber; wherein an axial-directional one side of said seal ring is provided with a positioning stopper portion contacting with a stopper surface formed in said first load supporting member or said second load supporting member; and wherein an angle formed by said stopper surface and a straight line, which passes through a contact point between the curve portion axially further from said stopper portion in said first and second curve portions and said first or second load support portion and a contact point between said stopper portion and said stopper surface, is set to be smaller than an axial-directional angle of said straight line.