Grease composition and grease-sealed roller bearing

Patent metadata

Field	Value
Publication number	US-10597598-B2
Application number	US-201615751860-A
Country	US
Kind code	B2
Filing date	Jul 29, 2016
Priority date	Aug 10, 2015
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

Provided is a grease composition which can be used as a lubricant for roller bearings, exhibits excellent high temperature durability and rust preventive property, and can prevent premature flaking on the rolling surface due to hydrogen embrittlement. A roller bearing 1 is obtained by sealing a grease composition 7 in the periphery of a rolling element 4 , this grease composition 7 is composed of a base oil excluding an ester-based synthetic oil, a thickener, and an additive, the additive contains (a) an alkanolamine and (b) 2,2,4-trimethyl-1,2-dihydroquinoline or a polymer thereof but does not contain an organic sulfonate, and (a) and (b) are contained at from 0.1 to 10 parts by weight with respect to 100 parts by weight of a total amount of the base oil and the thickener, respectively.

First claim

The invention claimed is:

1. A grease composition consisting of:
a base oil excluding an ester-based synthetic oil;
a thickener; and
an additive, wherein
the additive consists of (a) an alkanolamine (b) a compound represented by the following formula (1) or a polymer of the compound; (c) zinc-dithiophosphate, (d) a metal salt of an organic acid, and (e) an amine-based antioxidant, but does not contain an organic sulfonate, wherein
(a) and (b) above are contained at from 0.1 to 10 parts by weight with respect to 100 parts by weight of a total amount of the base oil and the thickener, respectively;
(c), (d) and (e) above are contained at from 0.1 to 10 parts by weight with respect to 100 parts by weight of a total amount of said base oil and the thickener, respectively

2. The grease composition according to claim 1 , wherein the alkanolamine is diethanolamine.

3. The grease composition according to claim 1 , wherein the metal salt of an organic acid is disodium sebacate and the amine-based antioxidant is octylated diphenylamine.

4. The grease composition according to claim 1 , wherein
the alkanolamine is diethanolamine,
the additive contains (c) zinc dithiophosphate, (d) a metal salt of an organic acid, and (e) an amine-based antioxidant, wherein (c) to (e) above are contained at from 0.1 to 10 parts by weight with respect to 100 parts by weight of a total amount of the base oil and the thickener, respectively, and
the metal salt of an organic acid is disodium sebacate and the amine-based antioxidant is octylated diphenylamine.

5. The grease composition according to claim 1 , wherein the base oil is at least one oil selected from an alkyl diphenyl ether oil and a poly-α-olefin oil.

6. The grease composition according to claim 1 , wherein the thickener is an alicyclic diurea compound.

7. A grease-sealed roller bearing comprising a grease composition sealed in the grease-sealed roller bearing, wherein
the grease composition is the grease composition according to claim 1 .

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Ito Motohiro
• Kondou Ryouta
• Kawamura Takayuki

Classifications

• C10M2223/045

  Metal containing thio derivatives · CPC title

• C10N2030/10

  Inhibition of oxidation, e.g. anti-oxidants · CPC title

• F16C33/66

  Special parts or details in view of lubrication · CPC title

• C10M2205/0285

  used as base material · CPC title

• C10N2040/02

  Bearings · CPC title