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An electrically driven air pump has a housing incorporating an electric motor in one section of the housing and a pump mechanism coupled to the motor in another section of the housing. The housing has a pump cover enclosing the pump mechanism, made of plastic and having an end wall to which a metal

An electrically driven air pump has a housing incorporating an electric motor in one section of the housing and a pump mechanism coupled to the motor in another section of the housing. The housing has a pump cover enclosing the pump mechanism, made of plastic and having an end wall to which a metal reinforcement member is joined by injection molding. The metal reinforcement member is formed as a ring having inner and outer perimetral surfaces and a plurality of radial slots are formed in the ring for passage of the plastic material therethrough to anchor the reinforcement member to the end wall. The slots extend from the inner perimetral surface of the ring towards the outer perimetral surface but terminate before reaching the outer perimetral surface. The outer perimetral surface of the metal reinforcement member is free and unobstructed for undergoing dimensional change due to temperature variation.

대표청구항 ▼

[ What is claimed is:] [1.] An electrically driven air pump comprising a housing including an electric motor in one section of the housing and a pump mechanism coupled to the motor in another section of the housing, said housing including a pump cover on said one section enclosing said pump mechanis

[ What is claimed is:] [1.] An electrically driven air pump comprising a housing including an electric motor in one section of the housing and a pump mechanism coupled to the motor in another section of the housing, said housing including a pump cover on said one section enclosing said pump mechanism, said pump cover being made of plastic and having an end wall including a metal reinforcement member joined by injection molding to said end wall, said metal reinforcement member having inner and outer perimetral surfaces and aperture means between said surfaces through which the plastic of said end wall extends by said injection molding to anchor the reinforcement member to said end wall, said outer perimetral surface of the metal reinforcement member being free and unobstructed for undergoing dimensional change due to temperature variation.