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US 9,541,135 B2Granted
Gel lubricant, rolling bearing, pivot assembly bearing, and hard disk drive
AssigneeMinebea Co., Ltd.
InventorMotojiro Tsuna
Life of this patent
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Abstract
There is provided a gel lubricant including: a base oil containing an ester synthetic oil and a synthetic hydrocarbon oil in which the mass ratio (X:Y) of the ester synthetic oil (X) to the synthetic hydrocarbon oil (Y) is in the range of 35:65 to 75:25; and a gelatinizer which contains two kinds of styrene block copolymers and is included in the gel lubricant in an amount of 1.5% by mass to 10% by mass.
Claims16
A gel lubricant comprising:
- a base oil containing an ester synthetic oil and a synthetic hydrocarbon oil in which a mass ratio (X:Y) of the ester synthetic oil (X) to the synthetic hydrocarbon oil (Y) is in the range of 35:65 to 75:25;
- and
- a gelatinizer consisting of two kinds of styrene block copolymers and being included in the gel lubricant in an amount of 1.5% by mass to 10% by mass in relation to total mass of the gel lubricant,
- wherein the two kinds of styrene block copolymers are selected from the group consisting of styrene-(ethylene/propylene)-styrene block copolymer, styrene-(ethylene-ethylene/propylene)-styrene block copolymer, styrene-(ethylene/propylene) block copolymer, and styrene-(ethylene/butylene)-styrene block copolymer, and
- wherein the base oil is in a gel state.
2 more elements
A gel lubricant comprising:
- a base oil containing an ester synthetic oil and a synthetic hydrocarbon oil in which a mass ratio (Y) of the ester synthetic oil (X) to the synthetic hydrocarbon oil (Y) is in the range of 40:60 to 70:30;
- and
- a gelatinizer consisting of two kinds of styrene block copolymers and being included in the gel lubricant in an amount of 1.5% by mass to 10% by mass in relation to total mass of the gel lubricant,
- wherein the ester synthetic oil is trioctyl trimellitate and the synthetic hydrocarbon oil is poly-α-olefin;
- the two kinds of styrene block copolymers are composed of styrene-(ethylene/propylene)-styrene block copolymer as a first styrene block copolymer and styrene-(ethylene-ethylene/propylene)-styrene block copolymer as a second styrene block copolymer;
- and
- a mass ratio (m:n) of the first styrene block copolymer (m) to the second styrene block copolymer (n) is in the range of 80:20 to 20:80.
4 more elements
Dependencies are inferred from the claim text.