Rolling bearing and its packaging method

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.

The invention 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, the entire bearing is covered with a volatile corrosion inhibitor film, and a space between the volatile corrosion inhibitor film and the bearing is kept in a pressure-reduced condition.   
     
     
       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 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, the entire bearing is covered with a volatile corrosion inhibitor film, and a space between the volatile corrosion inhibitor film and the bearing is kept in a pressure-reduced condition, 
 wherein the entire bearing is covered with the volatile corrosion inhibitor film and the space between the volatile corrosion inhibitor film and the bearing is kept in the pressure-reduced condition, 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. 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 covering the entire bearing 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.   
     
     
       5. The method of packaging the rolling bearing according to  claim 4 , wherein the chloride ions and the sulfate ion 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 . 
     
     
       6. The method of packaging the rolling bearing according to  claim 4 , 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 covering the entire bearing 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, 
 wherein after the adhesion of the antitrust oil, a bearing interior space defined by an inner ring, an outer ring and rolling elements is charged with grease, and the entire bearing is covered with the volatile corrosion inhibitor film such that the space between the volatile corrosion inhibitor film and the bearing is kept in the pressure-reduced condition.