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Title:
GREASE COMPOSITION FOR EV/HEV DRIVE MOTOR BEARING, AND EV/HEV DRIVE MOTOR BEARING
Document Type and Number:
WIPO Patent Application WO/2013/015413
Kind Code:
A1
Abstract:
The present invention provides a grease composition for an EV/HEV drive motor bearing, the composition containing: a diurea thickener of formula (A) as well as a base oil containing at least 80 mass% of trimethylolpropane ester oil per the total mass of base oil, the dynamic viscosity of the base oil at 40°C being 15 to 50 mm2/s. (In the formula, R2 represents a C6-15 divalent aromatic hydrocarbon group. R1 and R3 are the same or different groups, and represent a C16-20 linear or branched alkyl group or cyclohexyl group, the proportion of the number of moles of the C16-20 linear or branched alkyl group relative to the sum of the numbers of moles of the C16-20 linear or branched alkyl group and the cyclohexyl group [{(number of alkyl groups)/(number of cyclohexyl groups + number of alkyl groups)} ×100] being 60 to 80%.) This grease composition has a long bearing lubrication lifespan even at high temperature/high speed conditions, and satisfies low-temperature fluidity.

Inventors:
MIZUKI HIRONORI (JP)
MAEJIMA TAKESHI (JP)
ISO KENICHI (JP)
NAKAGAWA KAZUNORI (JP)
IMAI YUTAKA (JP)
AIDA RYO (JP)
Application Number:
PCT/JP2012/069165
Publication Date:
January 31, 2013
Filing Date:
July 27, 2012
Export Citation:
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Assignee:
NSK LTD (JP)
KYODO YUSHI (JP)
MIZUKI HIRONORI (JP)
MAEJIMA TAKESHI (JP)
ISO KENICHI (JP)
NAKAGAWA KAZUNORI (JP)
IMAI YUTAKA (JP)
AIDA RYO (JP)
International Classes:
C10M169/02; C10M105/38; C10M115/08; C10M129/10; C10M133/12; C10M159/24; F16C33/66; C10N20/00; C10N20/02; C10N30/00; C10N30/02; C10N30/06; C10N30/10; C10N40/02; C10N50/10
Foreign References:
JPH037968A1991-01-16
JP2010001986A2010-01-07
JP2011084646A2011-04-28
JP2010132746A2010-06-17
JPH01259097A1989-10-16
JP2000198993A2000-07-18
Other References:
See also references of EP 2738242A4
Attorney, Agent or Firm:
TSUJII Koichi et al. (JP)
辻居 Koichi (JP)
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Claims: