Low friction cam shaft
AssigneeFord Global Technologies, LLC
InventorsVemulapalli Durga N. Rao, Harry Arthur Cikanek, Daniel Joseph German, Daniel Michael Kabat
Life of this patent
Estimating the term…
Abstract
A low friction cam shaft for actuating at least one valve of an internal combustion engine includes a shaft member extending longitudinally, at least one cam secured to the shaft member, the cam being made of a plurality of density metal materials and having an outer surface 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.
Claims19
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.
A low friction cam shaft for actuating at least one valve of an internal combustion engine comprising:
- a shaft member extending longitudinally and having ia first outer surface;
- at least one cam secured to said shaft member having a base circle portion and lobe portion, said base circle and lobe portions having a second outer surface, said first and second outer surfaces having an open porosity and are impregnated with a solid film lubricant comprised of graphite and at least one of molybdenum disulfide and boron nitride in either one of a high temperature polymer and epoxy base, the solid film lubricant has an affinity for oil and promotes rapid formation of a stable oil film to reduce friction therebetween.
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 having a base circle portion and lobe portion, said base circle and lobe portions having a second outer surface,
- wherein an interior portion of said base circle portion is a soft low carbon steel;
- wherein said lobe portion and a remainder of said base circle portion are formed of a porous medium to high carbon Ni-Cr alloy steel;
- and
- at least one bearing member on said shaft member having a third outer surface with at least one furrow extending along the longitudinal direction of said shaft. member;
- said first and second and third outer surfaces having an open porosity and are impregnated with a solid film lubricant, the solid film lubricant has an affinity for oil and promotes rapid formation of a stable oil film to reduce friction therebetween.
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 having a base circle portion and lobe portion, said base circle and lobe portions 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.
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 having a base circle portion and lobe portion, said base circle and lobe portions having a second outer surface,
- at least one bearing member on said shaft member having a third outer surface;
- said first and second and third outer surfaces having an open porosity and are impregnated with a solid film lubricant, the solid film lubricant has an affinity for oil and promotes rapid formation of a stable oil film to reduce friction therebetween.
Dependencies are inferred from the claim text.