Lubricant composition for a speed reducer, and speed reducer

Patent metadata

Field	Value
Publication number	US-11053451-B2
Application number	US-201816487137-A
Country	US
Kind code	B2
Filing date	Feb 20, 2018
Priority date	Feb 21, 2017
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

The invention provides a lubricant composition for an eccentric oscillating planetary gear type speed reducer comprising the following components (a) to (d): (a) a base oil containing a synthetic oil; (b) at least one calcium salt selected from the group consisting of calcium salts of petroleum sulfonic acids, calcium salts of alkyl aromatic sulfonic acids, calcium salts of salicylates, calcium salts of phenates, calcium salts of oxidized waxes, overbased calcium salts of petroleum sulfonic acids, overbased calcium salts of alkyl aromatic sulfonic acids, overbased calcium salts of salicylates, overbased calcium salts of phenates, and overbased calcium salts of oxidized waxes; (c) an antioxidant; and (d) a glycerin fatty acid ester.

First claim

What is claimed is:

1. A lubricant composition for an eccentric oscillating planetary gear type speed reducer, consisting of the following components (a) to (e):
(a) a base oil containing a synthetic oil;
(b) at least one calcium salt selected from the group consisting of calcium salts of petroleum sulfonic acids, calcium salts of alkyl aromatic sulfonic acids, calcium salts of salicylates, calcium salts of phenates, calcium salts of oxidized waxes, overbased calcium salts of petroleum sulfonic acids, overbased calcium salts of alkyl aromatic sulfonic acids, overbased calcium salts of salicylates, overbased calcium salts of phenates, and overbased calcium salts of oxidized waxes;
(c) an antioxidant;
(d) a glycerin fatty acid ester; and
(e) an optional additive selected from the group consisting of metal salt rust inhibitors other than the component (b), metal salt detergent-dispersants other than the component (b), antioxidants other than the component (c), metal corrosion inhibitors, antiwear agents, extreme pressure agents, and solid lubricants other than the component (d).

2. The lubricant composition for a speed reducer according to claim 1 , wherein a content of the (b) calcium salt is 0.05 to 5% by mass, a content of the (c) antioxidant is 0.05 to 5% by mass, and a content of the (d) glycerin fatty acid ester is 0.05 to 5% by mass based on a total mass of the lubricant composition.

3. The lubricant composition for a speed reducer according to claim 1 , wherein the (b) calcium salt is selected from the group consisting of calcium salts of alkyl aromatic sulfonic acids and overbased calcium salts of salicylates.

4. The lubricant composition for a speed reducer according to claim 1 , wherein the (c) antioxidant is a hindered phenol.

5. The lubricant composition for a speed reducer according to claim 1 , wherein the synthetic oil in the (a) base oil is a synthetic hydrocarbon oil, and a kinematic viscosity at 40° C. of the base oil is 20 to 300 mm 2 /s.

6. The lubricant composition for a speed reducer according to claim 1 , further comprising (e) a thiadiazole compound, wherein a content of the thiadiazole compound is 5% by mass or less based on a total mass of the lubricant composition.

7. An eccentric oscillating planetary gear type speed reducer, wherein the lubricant composition for a speed reducer according to claim 1 is sealed.

Assignees

• Kyodo Yushi
• Nabtesco Corp

Inventors

• Tanimura Ko
• Ichimura Ryosuke
• Saito Ryosuke
• Wang Hongyou
• Kumagai Takahide

Classifications

• C10N2040/04

  Oil-bath; Gear-boxes; Automatic transmissions; Traction drives · CPC title

• C10M169/04 Primary

  Mixtures of base-materials and additives · CPC title

• C10M2219/106

  Thiadiazoles · CPC title

• C10N2030/08

  Resistance to extreme temperature · CPC title

• C10N2010/04

  Groups 2 or 12 · CPC title