# US 2014/0193110 A1 · Grease Composition and Wheel Supporting Rolling Bearing Unit Having Grease Composition Packed Therein

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0193110 A1
- Document ID: US20140193110A1
- Status: Published application
- Kind: A1
- Application number: 13/824,241
- Filed: 2012-09-18
- Published: 2014-07-10
- Earliest claimed: 2011-09-26
- Assignees: Nsk Ltd.
- Applicants: Nsk Ltd
- Inventors: Kazuhiro Soga; Takayuki Miyagawa; Noriyuki Inami
- Web page: https://patentgrep.com/patent/US20140193110A1

## CPC

- F16C 33/6633: {Grease properties or compositions, e.g. rheological properties}
- C10M 169/06: Mixtures of thickeners and additives
- C10M 2203/1006: used as base material
- C10M 2205/0285: used as base material
- C10M 2207/0406: used as base material
- C10M 2207/12: having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M 2207/16: Naphthenic acids
- C10M 2207/2805: used as base material
- C10M 2207/288: containing free carboxyl groups
- C10M 2215/04: having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M 2215/064: Di- and triaryl amines
- C10M 2215/1026: used as thickening material
- C10M 2219/044: Sulfonic acids, Derivatives thereof, e.g. neutral salts
- C10M 2223/047: Thioderivatives not containing metallic elements
- 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 2030/76: {Reduction of noise, shudder, or vibrations}
- C10N 2040/02: Bearings
- C10N 2050/10: semi-solid; greasy
- F16C 19/184: {in O-arrangement}
- F16C 19/386: {in O-arrangement}
- F16C 2326/02: Wheel hubs or castors
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- 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

## Abstract

There is provided a grease composition decreasing the load sensitivity to a running torque, maintaining necessary performances for a wheel supporting rolling bearing unit, and maintaining a good lubricated condition for a long time, and, a wheel supporting rolling bearing unit having the grease composition packed therein. The grease composition contains base oil, thickeners, rust inhibitors, and anti-wear agents, the base oil contains mineral oil, synthetic oil or blend oil of the mineral oil and the synthetic oil, a mix ratio (mass ratio) of the mineral oil and the synthetic oil is 0:100 to 20:80, a kinematic viscosity of the base oil at a temperature of 40° C. is 70 to 150 mm2/s, and a pour point of the base oil is equal to or lower than −40° C. The wheel supporting rolling bearing unit is packed with this grease composition.

## Claims

### Claim 1

A grease composition comprising: base oil; a thickener; a rust inhibitor; and an anti-wear agent,
the base oil comprising mineral oil, synthetic oil or blend oil of the mineral oil and the synthetic oil, a mix ratio (mass ratio) of the mineral oil and the synthetic oil being 0:100 to 20:80,
wherein a kinematic viscosity of the base oil at a temperature of 40° C. being 70 to 150 mm2/s, and
wherein a pour point of the base oil being equal to or lower than −40° C.

### Claim 2 (depends on 1)

The grease composition according to claim 1, wherein
the thickener contains an aromatic-series diurea compound at a content rate of 10 to 40 mass % relative to a total amount of the grease composition and expressed by a following general formula (I),
the rust inhibitor contains a carboxyl-acid-based rust inhibitor, a carboxylate-based rust inhibitor, and an amine-based rust inhibitor, and
the anti-wear agent is triphenyl-phosphorothioate.
R2—NHCONH—R1—NHCONH—R3 General Formula (I)
(in the general formula (I), R1 is aromatic-series hydrocarbon group with a carbon number of 6 to 15, and R2 and R3 are aromatic-series hydrocarbon groups with a carbon number of 6 to 12. R2 and R3 may be same or different).

### Claim 3 (depends on 1)

The grease composition according to claim 1, wherein
the thickener contains a diurea compound that is at least either one of an alicyclic diurea compound and an aliphatic diurea compound at a content rate of 10 to 30 mass % relative to a total amount of the grease composition and expressed by a following general formula (II),
the rust inhibitor contains a carboxyl-acid-based rust inhibitor, a carboxylate-based rust inhibitor, and an amine-based rust inhibitor, and
the anti-wear agent is triphenyl-phosphorothioate.
R5—NHCONH—R4—NHCONH—R6 General Formula (II)
(in the general formula (I), R4 is aromatic-series hydrocarbon group with a carbon number of 6 to 15, and R5 and R6 are aliphatic hydrocarbon group with a carbon number of 6 to 20 or cyclohexyl derivative group with a carbon number of 6 to 12. R5 and R6 have a rate of cyclohexyl derivative group that is 50 to 90 mol % in the total amount of the thickener, and R5 and R6 may be same or different).

### Claim 4 (depends on 1)

A wheel supporting rolling bearing unit in which the grease composition according to claim 1 is packed.

### Claim 5 (depends on 2)

A wheel supporting rolling bearing unit in which the grease composition according to claim 2 is packed.

### Claim 6 (depends on 3)

A wheel supporting rolling bearing unit in which the grease composition according to claim 3 is packed.