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US 2016/0201726 A1Published application
Rolling device
AssigneesKyodo Yushi Co., Ltd., Nsk Ltd.
InventorsEri WATABE, Kentaro SONODA, Yujiro TODA, Koichi HACHIYA, Atsuhiro YAMAMOTO, Masamichi YAMAMOTO, Kenichiro MATSUBARA, Junichi IMAI
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Abstract
In the rolling device of the present invention, a grease composition is enclosed which contains a base oil having a kinematic viscosity of 15 to 80 mm2/s at 40° C. and, as a thickener, a mixture of lithium 12-hydroxystearate and a lithium fatty acid having a carbon number of 6 to 12, and has a dropping point of 190 to 240° C. and a yield stress of 1.2 to 5 kPa. Accordingly, the torque is reduced and the acoustic life is improved.
Claims4
A rolling device comprising:
- an inner ring having an inner ring raceway on an outer peripheral surface thereof;
- an outer ring having an outer ring raceway on an inner peripheral surface thereof;
- a plurality of rolling elements rotatably provided between the inner ring raceway and the outer ring raceway;
- and a cage, wherein a grease composition is enclosed in the rolling device, wherein:
- the grease composition contains:
- a base oil having a kinematic viscosity of 15 to 80 mm2/s at 40° C.;
- and, as a thickener, a mixture of lithium 12-hydroxystearate and a lithium fatty acid having a carbon number of 6 to 12, and
- the grease composition has a dropping point of 190 to 240° C. and a yield stress of 1.2 to 5 kPa.
5 more elements
Dependencies are inferred from the claim text.