Adeka Corporation

Ud Trucks Corporation

Dic Corporation

Akihiro Kotaka

Kenji Yamamoto

Keisuke Yari

Sachiyo Ono

Masaru Iijima

Noriyoshi Tanaka

Shinji Iino

Hiroshi Sakata

Eiji Katsuno

Hironobu Matsueda

The present invention provides a lubricating oil additive, including: a molybdenum compound (A) represented by the following general formula (1); and a sulfur-based composition (B) containing a sulfur-based compound (b-1) represented by the following general formula (2) and at least one kind of sulfur-based compound (b-2) represented by the following general formula (3) or (4), and a lubricating oil composition containing the additive. In the formula (1), Rto Reach represent alkyl groups having 6 to 18 carbon atoms, the groups being identical to or different from each other, and Xto Xeach independently represent an oxygen atom or a sulfur atom. In the formula (2), Rrepresents an alkyl group having 1 to 22 carbon atoms, Rrepresents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, Rrepresents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, and 'a' represents a number from 1 to 10. In the formulae (3) and (4), Rto Reach represent alkylene groups having 1 to 28 carbon atoms, the groups being identical to or different from each other, Rand Reach independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and 'b' and &#x201c;c&#x201d; each independently represent a number from 1 to 8, provided that at least one of Ror Rrepresents an alkyl group having 1 to 3 carbon atoms.

Lubricating oil additive and lubricating oil composition containing same

The purpose of the present invention is to provide: a sliding member having a lubricating film formed on the sliding surface thereof, and capable of exhibiting friction-reducing performance; and a friction reduction method for the same. To that end, the present invention entails coating the sliding surface with a titanium nitride-based material (for example, titanium carbon nitride, titanium nitride, or titanium aluminum nitride), adding a molybdenum dithiocarbamate with molybdenum in the amount of 600-1000 ppm to diesel engine oil, setting the arithmetic mean roughness of the sliding member to 2-10 nm, and upon converting the Sommerfeld number viscosity to Pa&#xb7;s, the speed to s, and the load to mean Hertzian stress (Pa), then the lubrication conditions for use are within the range of 2.12365&#xd7;10to 5.94509&#xd7;10.

Sliding mechanism and friction reduction method for the same

The purpose of the present invention is to provide: a sliding mechanism having a lubricating film formed on the sliding surface thereof, and capable of exhibiting friction-reducing performance; and a friction reduction method for the same. To that end, the present invention entails coating the sliding surface with chromium nitride, adding a molybdenum dithiocarbamate with molybdenum in the amount of 600-1000 ppm to diesel engine oil, setting the arithmetic mean roughness of the sliding member to 2-60 nm, and upon converting the Sommerfeld number viscosity to Pa&#xb7;s, the speed to s, and the load to mean Hertzian stress (Pa), then the lubrication conditions for use are within the range of 2.12365&#xd7;10to 5.94509&#xd7;10.

Growing community of inventors

Tokyo, Japan

Akihiro Kotaka