COMBINED CIRCULAR SEAL Russian patent published in 1999 - IPC

FIELD: contact sealing devices used in hydraulic and pneumatic units. SUBSTANCE: seal includes combined of sealing and hold-down members made in form of single molded continuum with interpenetrating mixed bonds of element materials; first of these materials has indices of modulus of elasticity, ultimate strength and relative elongation at rupture, wear resistance and friction coefficient determined respectively by the following intervals: 410 to 1700 MPa; 16 to 144 MPa; 15 to 470 percent; 35 to 120 MPa; 9,3•10^-8 to 5,6•10^-7 m per kilometer and 0.02 to 0.15; it located between working surface of continuum and equilibrium boundary of its moulding element materials and second element material which has indices of modulus of elasticity, ultimate strength at rupture and Shore hardness A determined by the following intervals: 2.5 to 23.0 MPa; 4 to 17 MPa and 45 to 97 of arbitrary units and is located between above-mentioned equilibrium boundary and base surface of continuum thus formed. EFFECT: simplified construction; enhanced sealing of engageable surfaces and enhanced efficiency of operation at high economical and technical characteristics. 4 cl, 2 dwg