Rolling bearing

Patent metadata

Field	Value
Publication number	US-9765821-B2
Application number	US-201414905948-A
Country	US
Kind code	B2
Filing date	Jul 18, 2014
Priority date	Jul 19, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A rolling bearing that can prevent peeling on a surface of an iron-based metal member by hydrogen brittleness even under a severe environment is provided. The rolling bearing 1 has plural bearing elements formed of an iron-based metal, and a lubricant composition 7 that lubricates metal contact surfaces of the respective bearing elements, the lubricant composition 7 is a grease containing a base oil and alkanolamine and being free of alkali metal salts and alkaline earth metal salts of inorganic acids, the base oil is at least one oil selected from alkyl diphenyl ether oils, poly-α-olefin oils and ester oils, and the alkanolamine is contained by 0.1 to 10 parts by weight with respect to 100 parts by weight of the total amount of the base oil and a thickener.

First claim

The invention claimed is:

1. A rolling bearing comprising a plurality of bearing elements formed of an iron-based metal, and a lubricant composition that lubricates metal contact surfaces of the respective bearing elements,
wherein the lubricant composition is a grease consisting of a base oil, diethanolamine,
a thickener,
a zinc dithiophosphate, and
an amine-based antioxidant,
wherein the grease is free of alkali metal salts and alkaline earth metal salts of inorganic acids,
wherein the base oil is (A) an oil containing an alkyl diphenyl ether by 25% by weight or more with respect to the entirety of the base oil, or (B) an oil containing an ester oil by 25% by weight or more with respect to the entirety of the base oil,
wherein the thickener contains at least one urea compound selected from aliphatic diurea compounds, alicyclic diurea compounds, and
wherein diethanolamine is contained by 0.1 to 10 parts by weight with respect to 100 parts by weight of the total amount of the base oil and the thickener.

2. The rolling bearing according to claim 1 , wherein the rolling bearing is a bearing for an electrical component/an auxiliary machine for automobiles, which rotatably supports a rotation axis that is rotated and driven by output of an engine on a static element.

3. The rolling bearing according to claim 2 , wherein the base oil contains a poly-α-olefin oil.

4. The rolling bearing according to claim 2 , wherein the thickener is an alicyclic diurea compound.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Kawamura Takayuki
• Ito Motohiro

Classifications

• F16C2360/46

  Fans, e.g. ventilators · CPC title

• C10M2207/2805

  used as base material · CPC title

• C10M133/08

  containing hydroxy groups · CPC title

• F16C2361/63

  Gears with belts and pulleys · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title