# US 2013/0157915 A1 · Grease composition for hub unit bearing

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- Number: US 2013/0157915 A1
- Document ID: US20130157915A1
- Status: Published application
- Kind: A1
- Application number: 13/820,604
- Filed: 2011-09-02
- Published: 2013-06-20
- Earliest claimed: 2010-09-02
- Assignees: Ntn Corporation; Kyodo Yushi Co., Ltd.
- Inventors: Takashi Azuma; Yoshihisa Imamoto; Motohiro Ito; Yasushi Shibata
- Web page: https://patentgrep.com/patent/US20130157915A1

## CPC

- C10M 141/10: at least one of them being an organic phosphorus-containing compound
- C10M 169/06: Mixtures of thickeners and additives
- C10M 2203/1006: used as base material
- C10M 2205/12: Oxidised hydrocarbons, i.e. oxidised subsequent to macromolecular formation
- C10M 2207/10: Carboxylix acids; Neutral salts thereof
- C10M 2215/1026: used as thickening material
- C10M 2219/044: Sulfonic acids, Derivatives thereof, e.g. neutral salts
- C10M 2223/04: Phosphate esters
- C10M 2223/049: Phosphite
- C10N 2010/04: Groups 2 or 12
- C10N 2020/02: Viscosity; Viscosity index
- C10N 2030/02: Pour-point; Viscosity index
- C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
- C10N 2030/12: Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
- C10N 2040/02: Bearings
- C10N 2050/10: semi-solid; greasy
- F16C 19/186: {with three raceways provided integrally on parts other than race rings, e.g. third generation hubs}
- F16C 33/6633: {Grease properties or compositions, e.g. rheological properties}
- F16C 2326/02: Wheel hubs or castors
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

The invention provides a grease composition for huh unit bearing, containing (a) an aromatic diurea thickener, (b) a base oil, (c) a metal salt of oxidized wax, (d) diphenyl hydrogen phosphate, and (e) at least one rust preventive selected from the group consisting of sulfonate rust preventives and carboxylic acid rust preventives. The grease composition of the invention shows excellent anti-fretting properties at low temperature, and at the same time, exhibit excellent rust preventing properties.

## Claims

### Claim 1

A grease composition for hub unit bearing, comprising the following components (a) to (e):
(a) an aromatic diurea thickener,
(b) a base oil,
(c) a metal salt of oxidized wax,
(d) diphenyl hydrogen phosphate, and
(e) at least one rust preventive selected from the group consisting of sulfonate rust preventives and carboxylic acid rust preventives.

### Claim 2 (depends on 1)

The grease composition for hub unit bearing of claim 1, wherein the rust preventive (e) is calcium sulfonate.

### Claim 3 (depends on 1)

The grease composition for hub unit bearing of claim 1, wherein the rust preventive (e) is calcium dinonylnaphthalenesulfonate.

### Claim 4 (depends on 1)

The grease composition for hub unit bearing of claim 1, wherein the rust preventive (e) is contained in an amount of 0.5 to 5 mass % of the total mass of the grease composition.

### Claim 5 (depends on 1)

The grease composition for hub unit bearing of claim 1, wherein the metal salt of oxidized wax (c) is a calcium salt of oxidized petroleum wax.

### Claim 6 (depends on 1)

The grease composition for hub unit bearing of claim 1, wherein the metal salt of oxidized wax (c) is contained in an amount of 0.5 to 10 mass % of the total mass of the grease composition.

### Claim 7 (depends on 1)

The grease composition for hub unit bearing of claim 1, wherein the diphenyl hydrogen phosphate (d) is contained in an amount of 0.1 to 5 mass % of the total mass of the grease composition.

### Claim 8 (depends on 1)

A hub unit bearing in which the grease composition of claim 1, is packed.