Rolling bearing

Abstract

The present invention is to provide a rolling bearing suitable for the use under a high temperature, high speed, high load and high vibration condition, having a good rust-preventive performance and the excellent flaking life without a hazard to a human body. A rolling bearing is described, comprising an inner race, an outer race and rolling elements, with a grease composition comprising, as the main components, a base oil, a thickener and at least one kind of a rust-preventive additive made from a naphthenate or a succinic acid derivative, packed in a bearing space formed by at least the inner race, the outer race and the rolling elements, said at least one kind of a rust-preventive additive is present in an amount of 0.1 to 10% by weight based on the total amount of the grease composition.

What is claimed is:  
     
         1 . A rolling bearing comprising an inner race, an outer race and rolling elements, with a grease composition comprising, as the main components, a base oil, a thickener and at least one kind of a rust-preventive additive made from a naphthenate or a succinic acid derivative, packed in a bearing space formed by at least the inner race, the outer race and the rolling elements, said at least one kind of a rust-preventive additive is present in an amount of 0.1 to 10% by weight based on the total amount of the grease composition.  
     
     
         2 . The rolling bearing as claimed in    claim 1   , wherein the naphthenate is a saturated monocyclic carboxylate represented by C n H 2n−1 COOM, a saturated polycyclic carboxylate represented by C n H 2n−3 COOM, a derivative thereof or a mixture thereof, wherein M represents a metal element.  
     
     
         3 . The rolling bearing as claimed in    claim 2   , wherein M is selected from the group consisting of Co, Mn, Zn, Al, Ca, Ba, Li, Mg, Cu and Zr.  
     
     
         4 . The rolling bearing as claimed in    claim 1   , wherein the succinic acid derivative is a succinic acid, an alkyl succinic acid, an alkyl succinic acid half ester, an alkenyl succinic acid, an alkenyl succinic acid half ester or a succinic acid imide.  
     
     
         5 . The rolling bearing as claimed in    claim 1   , wherein the amount of said at least one kind of the rust-preventive additive based on the total amount of the grease composition is 0.25 to 5% by weight.  
     
     
         6 . The rolling bearing as claimed in    claim 1   , wherein the thickener is a urea compound, a urea-urethane compound, a urethane compound or a mixture thereof.