Retrofits in element of wire to a piston engine for combustion in a combustion engine of the rotary type and the wire of top

摘要

A sealing element formed of a reinforced molded and cured polyimide resin, preferably an end-capped, polyimide resin, such as disclosed in U.S. Pat. Nos. 3,528,950 and 3,565,549, which has high thermal stability, high bending strength, low modulus of elasticity, low density, high capacity for vibration damping and high degree of ductility. The polyimide resin-forming prepolymer is mixed with a filler to impart desirable characteristics thereto and the resulting prepolymer composition is then subjected to compression molding to form a sealing element and/or a bearing facing therefor for use in internal combustion engines of both the reciprocating and rotary type to effect a seal against the flow of fluids between superficially contacting, relatively slidable surfaces such as those of a piston and its housing. The filler can be so selected from fibers and powders of organic and/or inorganic material, and can be used in such proportions to the polyimide resin as to impart to the sealing element increased compatibility with less wear and scuffing and with a lessened tendency toward chattering during operation of said sealing elements in contact with the mating parts, such as the trochoid housing and also the housing side plates of a rotary piston type of engine.