Grease composition

Patent metadata

Field	Value
Publication number	US-10844309-B2
Application number	US-201816027806-A
Country	US
Kind code	B2
Filing date	Jul 5, 2018
Priority date	Aug 23, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

Provided is a grease composition for a magnet clutch of an automobile, including: a base oil; and a thickener, wherein the composition contains 5% by mass or more of a sulfur content in terms of sulfur element relative to a total mass of the composition.

First claim

The invention claimed is:

1. A grease composition for a magnet clutch of an automobile, comprising:
50 to 95% by mass of a base oil;
a thickener, and,
optionally a sulfur-containing additive, wherein
the base oil comprises a synthetic base oil having a sulfur atom in its structure selected from the group consisting of fatty acid sulfides and polysulfides,
the base oil optionally comprises another base oil selected from the group consisting of mineral oils, ester-based synthetic oils, synthetic hydrocarbon oils, ether-based synthetic oils, silicone oils and fluorinated oils,
the base oil which optionally comprises the another base oil has a kinematic viscosity at 40° C. of 10 to 200 mm 2 /s,
the composition contains 20% by mass or more of a sulfur content derived from the synthetic base oil and the optional sulfur-containing additive in terms of sulfur element total mass of the composition, and
the thickener is silica treated with dimethyldichlorosilane.

2. The grease composition according to claim 1 , wherein a primary particle diameter of the silica is 300 nm or less.

3. The grease composition according to claim 1 , wherein the sulfur content in terms of sulfur element is 50% by mass or less relative to the total mass of the grease composition.

4. The grease composition according to claim 1 , wherein the synthetic base oil is polysulfide represented by any one of formulas (3) to (6):

wherein R is a hydrocarbon group.

5. The grease composition according to claim 1 , wherein the content of the thickener is 5 to 25% by mass relative to the total mass of the grease composition of the invention.

Assignees

• Kyodo Yushi
• Denso Corp

Inventors

• Ikejima Shozo
• Hirooka Iwaki
• Imai Yutaka
• Ichimura Ryosuke
• Isa Kazuki
• Asada Yusuke
• Inukai Kyoji
• Tanaka Hiromasa
• Tobayama Masashi
• Watanabe Toshizo

Classifications

• C10M2219/024

  of esters, e.g. fats · CPC title

• C10N2020/06

  Particles of special shape or size · CPC title

• C10M2201/1056

  used as thickening agents · CPC title

• C10M113/12

  Silica · CPC title

• C10M2219/102

  containing sulfur and carbon only in the ring · CPC title