Patent ID: 6167856
Filing Date: 2001-01-02
Classification: C10M,C10N,C23C,F01L,F02B,Y10T

Abstract:
A low friction cam shaft for actuating at least one valve of an internal combustion engine comprising: a shaft member extending longitudinally and having a first outer surface; at least one cam secured to said shaft member; and said at least one cam being made of a plurality of density metal materials, said at least one cam having a base circle portion and a lobe portion, said base circle portion having an interior portion and an outer portion, said outer portion of said base circle portion and said lobe portion being made of one of said density metal materials, said interior portion being made of another of said density metal materials, said interior portion having a porosity less than said lobe portion and said outer portion of said base circle portion, said outer portion of said base circle portion and said lobe portion having a second outer surface, said first and second outer surfaces having an open porosity and are impregnated with a solid film lubricant that has an affinity for oil and promotes rapid formation of a stable oil film to reduce friction therebetween.