ROLLING DEVICE EMPLOYING LUBRICATING GREASE COMPOSITION AND ELECTRIC POWER STEERING APPARATUS EMPLOYING THE ROLLING DEVICE

Title:

ROLLING DEVICE EMPLOYING LUBRICATING GREASE COMPOSITION AND ELECTRIC POWER STEERING APPARATUS EMPLOYING THE ROLLING DEVICE

Document Type and Number:

WIPO Patent Application WO/2006/118208

Kind Code:

A1

Abstract:

A rolling device employing a lubricating grease composition which contains a novel thickener and which significantly diminishes irregular frictional fluctuations generated on rolling/sliding frictional surfaces, shows stable low-torque characteristics in a wide temperature range, can retain a sufficient oil film even at high temperatures, and has a long life. The rolling device is characterized by employing a lubricating grease composition which comprises: a thickener which is a mixed thickener comprising (a) a diurea compound which is an aliphatic diurea compound having an average molecular weight of 500-750 and in which 10-70 mol% of the linear hydrocarbon group is accounted for by an unsaturated component, the diurea compound being one formed from one or more primary amines having a total amine value of 200-400, (b) a fatty acid metal salt, and (c) at least one amide compound selected from the group consisting of aliphatic amides and aliphatic bisamides respectively represented by the general formulae (I) and (II): R₁CONH₂ (I) R₁CONHR₂NHCOR₁ (II) (wherein R₁ represents C_15-17 (un)saturated alkyl and R₂ represents methylene or ethylene), the proportions of (a), (b), and (c) satisfying the relationship 0.2≤a/(b+c)≤10, provided that (1) the proportion of the ingredient (a) is 1-10, (2) the proportion of the ingredient (b) is 0.5-2.5, and (3) the proportion of the ingredient (c) is 0.5-2.5, and the amount of the thickener being 2-30 wt.% based on the whole composition; (d) a base oil which is a lube base oil having a pour point of -25°C or lower and comprising a synthetic hydrocarbon oil as the main component; and (e) an additive which is a mixture comprising an organomolybdenum complex, an organozinc compound of dithiocarbamic acid, and an organozinc compound of dithiophosphoric acid, the amount of the additive mixture being 1-7 wt.% based on the whole composition.

Inventors:

KUWABARA HIROFUMI
SUGIMORI SHIGEYUKI
ASAKURA TOSHIHIRO

Application Number:

PCT/JP2006/308867

Publication Date:

November 09, 2006

Filing Date:

April 27, 2006

Export Citation:

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Assignee:

JTEKT CORP (JP)
KUWABARA HIROFUMI
SUGIMORI SHIGEYUKI
ASAKURA TOSHIHIRO

International Classes:

C10M169/00; B62D5/04; C10M105/04; C10M107/02; C10M115/08; C10M117/02; C10M133/08; C10M135/18; C10M137/10; C10M159/18; F16C33/66; F16H25/22; C10N10/02; C10N10/04; C10N10/06; C10N10/12; C10N20/00; C10N20/04; C10N30/06; C10N30/08; C10N40/02; C10N50/10

Domestic Patent References:

WO2003006590A1

2003-01-23

Foreign References:

JP2004059604A	2004-02-26
JP2004204218A	2004-07-22
JP2003155491A	2003-05-30
JP2001049274A	2001-02-20
JP2001064665A	2001-03-13

Other References: