Idemitsu Kosan Company, Limited

Hitachi, Ltd.

Nikon Corporation

Hiroshi Oki

Naoto Horita

Hiroshi Suzuki

Takashi Shionoya

Motoharu Ishikawa

Jun Iwasaki

Yutaka Iwasaki

Kooichi Nakazima

Keiji Matsuura

Keizo Kazama

There is provided a lubricating oil composition which is excellent in the wear resistance and the oil film retention even when the viscosity of the composition is lowered. The lubricating oil composition comprises: a base oil (A); an imide compound (B); a calcium-based detergent (C); a polymer component (D); and a zinc dithiophosphate (E), wherein the imide compound (B) comprises at least one non-boron-modified succinic acid imide compound (Bx) selected from a succinic acid monoimide (B1x) represented by general formula (b-1) and a succinic acid bisimide (B2x) represented by general formula (b-2), and wherein the polymer compound (D) has a mass average molecular weight (Mw) of not less than 10,000 and not more than 50,000, and comprises at least one selected from an olefin polymer (D1) and a polymethacrylate (D2).

Lubricating oil composition

The present invention relates to a lubricant composition containing: a base oil (A); at least one kind of calcium-based detergent (B) selected from (B1) calcium sulfonate having a base number of 5.00 mgKOH/g or more and 100 mgKOH/g or less, (B2) calcium salicylate having a branched acyclic hydrocarbon group, and (B3) overbased calcium phenate having a branched acyclic hydrocarbon group; and at least one kind of ashless detergent (C) selected from (C1) a hindered amine compound having one piperidine-derived backbone in a molecule, and (C2) a specific diethanolamine compound. In the lubricant composition, the calcium atom content is 100 ppm by mass or more and 600 ppm by mass or less with respect to the total mass of the lubricant composition, and the ratio (N/Ca) of the nitrogen atom content (N) of the ashless detergent (C) to the calcium atom content (Ca) of the calcium-based detergent (B) is 1.3 to 3.1 as a mass ratio.

Lubricant composition and method for producing same

The present invention relates to a lubricating oil composition to be used for internal combustion engines, the lubricating oil composition containing a base oil (A), an imide compound (B) that is at least one selected from a succinic acid monoimide (B1) represented by the general formula (b-1) and a succinic acid bisimide (B2) represented by the foregoing general formula (b-2), a metal-based detergent (C) that is at least one selected from a metal sulfonate (C1) having a branched alkyl group and a metal phenate (C2) having a branched alkyl group, and a zinc dithiophosphate (D), wherein the content of a phosphorus atom derived from the component (D) is less than 800 ppm by mass on the basis of the total amount of the lubricating oil composition; and a method for producing the same. The present invention is able to provide a lubricating oil composition in which even in the case where the content of a phosphorus atom derived from an anti-wear agent is reduced, it is possible to reveal excellent wear resistance in an internal combustion engine and a high friction coefficient in a wet clutch; and a method for producing the same.

Lubricating oil composition and production method therefor

The present invention relates to a lubricating oil composition containing a base oil (A) containing an olefin-based polymer (A1) having an area ratio of a peak derived from a hydride (A11) of a decene trimer of 80% or more relative to 100% of a total area of peaks derived from the olefin-based polymer (A1) detected in a chromatogram and having predetermined kinematic viscosity, flash point, and pour point, a viscosity index improver (B) containing a comb-shaped polymer (B1), and an organic molybdenum-based compound (C), in which the content of the comb-shaped polymer (B1) is regulated within a specified range and having a HTHS viscosity at each of 150&#xb0; C. and 50&#xb0; C. of the lubricating oil composition and a NOACK value in predetermined ranges, respectively.

Lubricating oil composition, internal combustion engine, and lubrication method for internal combustion engine

Provided is a lubricating oil composition containing a base oil (A) and a viscosity index improver (B) and satisfying the following requirements (I) and (II): Requirement (I): a kinematic viscosity at 80&#xb0; C., Vof the lubricating oil composition is 11.5 mm/s or less; Requirement (II): a ratio [V/T] of a kinematic viscosity at 80&#xb0; C., V(m/s) to an oil film thickness measured at a sliding speed of 2.0 m/s, a maximum Hertz pressure of 0.8 GPa, and an oil temperature of 80&#xb0; C., T(nm) of the lubricating oil composition is less than 0.105 ((m/s)/nm). The lubricating oil composition is excellent in fuel saving properties and anti-wear properties even when it is used in a temperature environment of around 80&#xb0; C. which is assumed to fall within a range where an engine is practically used.

Provided is a lubricating oil composition containing a base oil (A) containing a mineral oil (A1) having a complex viscosity &#x3b7;* at &#x2212;35&#xb0; C. of 150 Pa&#xb7;s or less as measured with a rotary rheometer under conditions at an angular velocity of 6.3 rad/s and a strain amount of 0.1%; a viscosity index improver (B) containing a comb-shaped polymer (B1); and a molybdenum-based friction modifier (C), wherein the content of the molybdenum-based friction modifier (C) in terms of a molybdenum atom is more than 500 ppm by mass and less than 900 ppm by mass on the basis of the whole amount of the lubricating oil composition, and a NOACK value is 10% by mass or less.

Lubricating oil composition, internal combustion engine, and method for lubricating internal combustion engine

An input/output method is provided which assures data consistency of a file spreading over a plurality of logically significant volumes or files distributed among a plurality of volumes. A storage subsystem at a main site handles as one group those input/output requests issued in a single process from a computer which call for data update on a plurality of logically significant volumes. The update request is executed on a plurality of volumes by group to implement the updating of volumes at a remote site en masse.

Data input/output method in information processing system, and information processing system

An optical recording medium has a track format with a track pitch smaller than a diffraction limit of a light spot so as to realize an increased capacity and a higher density. A guide groove for tracking purposes is formed along each of the concentrically or spirally formed tracks in a periodic intermittent pattern with respect to a circumferential direction of the optical recording medium. The intermittent patterns of the guide grooves adjoining each other with respect to a radial direction of the optical recording medium are displaced in phase from each other. A light spot of a diameter greater than the track width is projected onto the optical recording medium in rotation and the position of the light spot is servo-controlled in the track width direction in such a manner that a light quantity distribution with respect to the track width direction of a reflected or transmitted light of the light spot diffracted by the selected guide groove maintains its symmetry in the track width direction.

Optical recording medium employing an intermittent pattern for guiding

A confocal laser scanning mode interferene contrast microscope comprises a laser source, an illuminating optical system for condensing a light beam from the laser source and forming a light spot on an object to be examined, a condensing optical system for condensing the light beam from the object to be examined on a detecting surface, a detecting device for detecting the light beam condensed on the detecting surface, the detecting device having a substrate formed with a channel waveguide and two light detecting elements, the channel waveguide having a double mode channel waveguide having an entrance end surface on the detecting surface and a waveguide fork which forks the double mode channel waveguide into two channel waveguides, the two detecting elements detecting lights propagated through the two channel waveguides, a scanning device for moving the object to be examined and the light spot relative to each other, and a signal processing device for producing differential information of the object to be examined by the detection signals of the detecting elements.

Confocal laser scanning mode interference contrast microscope, and

An electron tube is disclosed in which an envelope glass bulb and a glass stem having an electron gun assembly mounted thereon and accommodated within the bulb are sealed to each other. The sealed interface portion between the bulb and the stem incorporates concentrically with the electron gun assembly a metallic ring member made of an alloy or metal material having a good bonding ability to the glass materials of the bulb and the stem. The sealing is effected by a high frequency heating of the metallic ring member. An ohmic heating may be additionally used.

Electron tube having glass-to-metal-to-glass seal

In a cathode ray tube reinforced by an annular reinforcing band mounted on the face plate of the tube by shrink fit, the opposite ends of the band are coupled together by interfitting members which accurately determine the peripheral length of the reinforcing band.

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Chiba, Japan

Hiroshi Oki