US 11,021,672 B2 · Lubricant composition for speed reducer and speed reducer

Abstract

The invention provides a lubricant composition for an eccentrically oscillating speed reducer of planetary gear type, which is capable of extending the life of the speed reducer under high temperatures and keeping low input torque at low temperatures, and includes (a) a base oil containing a synthetic oil, (b) a hydrocarbon wax, and (c) at least one calcium salt selected from the group consisting of a calcium salt of petroleum sulfonic acid, a calcium salt of alkyl aromatic sulfonic acid, a calcium salt of oxidized wax, an overbasic calcium salt of petroleum sulfonic acid, an overbasic calcium salt of alkyl aromatic sulfonic acid, and an overbasic calcium salt of oxidized wax.

Claims15

Dependent claims

A lubricant composition for an eccentrically oscillating speed reducer of planetary gear type, consisting of:

(a) a base oil which is a poly-alpha-olefin or a mixture of a poly-alpha-olefin and a mineral oil,
(b) a hydrocarbon wax which is a polypropylene wax or a ethylene-propylene copolymer wax, each of said waxes having a weight-average molecular weight of 1,000 to 20,000,
(c) at least one calcium salt selected from the group consisting of a calcium salt of petroleum sulfonic acid, a calcium salt of alkyl aromatic sulfonic acid, a calcium salt of oxidized wax, an overbasic calcium salt of petroleum sulfonic acid, an overbasic calcium salt of alkyl aromatic sulfonic acid, and an overbasic calcium salt of oxidized wax, and
(d) an optional additive.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

15/372,898Filed 8 Dec 2016

Priority

JP JP2015-25518025 Dec 2015

Published

US 2017/0183603 A129 Jun 2017

Granted

1 Jun 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification28 codes

C10M 169/044
Mixtures of base-materials and additives: the additives being a mixture of non-macromolecular and macromolecular compounds
C10M 169/047
Mixtures of base-materials and additives: the additives being a mixture of compounds of unknown or incompletely defined constitution and…
C10M 117/04
Having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen: containing hydroxy groups
C10M 137/10
Phosphate esters: thio derivatives

Lubricant composition for speed reducer and speed reducer

Life of this patent

Lubricant composition for speed reducer and speed reducer

Life of this patent

Abstract

Claims15