Seal Structure For Fluid Pressure Device

Abstract: [Problem] To provide a seal structure for a fluid pressure device, which has low sliding resistance and in which trapping, seizure, etc. caused by protrusion from a mounting groove are unlikely to occur. [Solution] A seal structure 2 has a mounting groove 16 which is formed in a first member 5, and packing 8 which is contained in the mounting groove 16. The packing 8 has a mounting section 20 on the inner periphery, and a sliding section 21 on the outer periphery. Both the side surfaces 22a, 22b of the packing 8 are circular conical surfaces which are tilted so that the diameter increases gradually from the mounting section 20 side toward the sliding section 21 side, and which are tilted in the opposite directions. The thickness of the packing 8 increases gradually from the mounting section 20 side toward the sliding section 21 side. The thickness T1 of the mounting section 20 is the smallest, and the thickness T2 of the sliding section 21 is the largest.

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