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US 5,846,644 AGranted
Low friction engine cylinder and production method therefor
AssigneeIsuzu Ceramics Research Institute Co., Ltd.
InventorsHideki Kita, Yasuaki Unno, Hideo Kawamura
Life of this patent
Estimating the term…
Abstract
A slidably engaged surface of a sliding member has a first travel length portion formed of a composite material providing a small contact angle with respect to lubricating oil and an adjoining second travel length portion formed of a composite material providing a higher contact angle with the lubricating oil. The first length portion preferably corresponds to boundary and mixed lubricating areas and the second length portion corresponds to a fluid lubricating area.
Claims13
An assembly comprising:
- an internal combustion engine cylinder defining an engagement surface;
- a piston member engaging said engagement surface and movable relative thereto along a path of movement;
- supply means for applying lubricating oil to said engagement surface so as to provide therewith a first lubricated length portion extending along said path;
- and a second lubricated length portion adjoining said first length portion along said path;
- and wherein said first length portion is adjacent to an outer end of said cylinder and is formed of a first material providing a first contact angle of less than 11.degree. with respect to lubricating oil adhered thereto, and said second length portion is inwardly adjacent to said first length portion and is formed of a second material having with respect to lubricating oil adhered thereto a second contact angle greater than 25.degree..
2 more elements
An assembly comprising:
- in internal combustion engine cylinder defining an engagement surface;
- a piston member engaging said engagement surface and movable relative thereto along a path of movement;
- supply means for applying lubricating oil to said engagement surface so as to provide therewith a first lubricated length portion extending along said path;
- and a second lubricated length portion adjoining said first length portion along said path;
- and wherein said first length portion is adjacent to an outer end of said cylinder and is formed of a first material exhibiting a given level of wettability by lubricating oil, said first material being a composite material selected from the group consisting of Fe.sub.3 O.sub.4 /Fe, Fe.sub.3 O.sub.4 /Al.sub.2 O.sub.3, FeS/Al.sub.2 O.sub.3, Fe.sub.3 O.sub.4 /Si.sub.3 N.sub.4, and Fe-Si/Si.sub.3 N.sub.4 ;
- and said second length portion is inwardly adjacent to said first length portion and is formed of a second material exhibiting a wettability by lubricating oil less than said given level.
3 more elements
Dependencies are inferred from the claim text.