Rolling bearing and its packaging method

Patent metadata

Field	Value
Publication number	US-9523391-B2
Application number	US-201615134454-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	May 31, 2013
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

To provide a rolling bearing in which a favorable antirust performance can be obtained while reducing an amount of antirust oil than before, after removing chloride ions and sulfate ions from the entire surface of the bearing, antirust oil is provided to adhere thereto at an average film thickness of 4.5 μm to 10 μm, and the entire bearing is covered with a volatile corrosion inhibitor film such that a space between the volatile corrosion inhibitor film and the bearing is kept in a pressure-reduced condition.

First claim

What is claimed is:

1. A rolling bearing comprising an inner ring, an outer ring, and a plurality of rolling elements retained between the inner ring and the outer ring by a retainer in a rollable manner,
wherein antirust oil is provided to adhere, at an average film thickness of 4.5 μm to 10 μm, to an entire surface of the bearing from which chloride ions and sulfate ions are removed, and the bearing is put in a bag made of a volatile corrosion inhibitor film.

2. The rolling bearing according to claim 1 , wherein an amount of residual chloride ions adhered to the rolling bearing per unit area is 0.2 ng/mm 2 to 10 ng/mm 2 .

3. The rolling bearing according to claim 2 , wherein the bearing is put in the bag in a state in which a bearing interior space defined by the inner ring, the outer ring and the rolling elements is charged with grease.

4. The rolling bearing according to claim 2 , wherein the bearing is sealed by the bag.

5. The rolling bearing according to claim 1 , wherein the bearing is put in the bag in a state in which a bearing interior space defined by the inner ring, the outer ring and the rolling elements is charged with grease.

6. The rolling bearing according to claim 1 , wherein the bearing is sealed by the bag.

7. A method of packaging a rolling bearing after assembling the rolling bearing from bearing components, the method comprising:
after removing chloride ions and sulfate ions from an entire surface of the bearing, providing antirust oil to adhere thereto at an average film thickness of 4.5 μm to 10 μm, and putting the bearing in a bag made of a volatile corrosion inhibitor film.

8. The method of packaging the rolling bearing according to claim 7 , wherein the chloride ions and the sulfate ions are removed from the entire surface of the rolling bearing such that an amount of residual chloride ions adhered to the rolling bearing per unit area is 0.2 ng/mm 2 to 10 ng/mm 2 .

9. The method of packaging the rolling bearing according to claim 8 , wherein after the adhesion of the antirust oil, a bearing interior space defined by an inner ring, an outer ring and rolling elements is charged with grease.

10. The method of packaging the rolling bearing according to claim 8 , wherein the bearing is sealed by the bag.

11. The method of packaging the rolling bearing according to claim 7 , wherein after the adhesion of the antirust oil, a bearing interior space defined by an inner ring, an outer ring and rolling elements is charged with grease.

12. The method of packaging the rolling bearing according to claim 7 , wherein the bearing is sealed by the bag.

Assignees

• Nsk Ltd

Inventors

• Matsunaga kyohei

Classifications

• F16C19/52

  with devices affected by abnormal or undesired conditions · CPC title

• B65D81/02

  specially adapted to protect contents from mechanical damage {(containers of polygonal cross-section provided with internal protecting elements for contents B65D5/50; devices to locate articles in containers B65D25/10)} · CPC title

• Y10T29/49703

  Sealing · CPC title

• C23F11/00

  Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent (adding inhibitors to mineral oil, fuels, or lubricants C10; adding inhibitors to pickling solutions C23G) · CPC title

• F16C33/6607

  Retaining the grease in or near the bearing · CPC title