Solid polymeric lubricant composition and polymeric lubricant packed rolling bearing

Abstract

The invention provides a solid polymeric lubricant composition which, when the composition is packed in a polymeric lubricant packed rolling bearing, does not increase the rotational torque of the bearing, and prevents voids from remaining when the composition is packed and formed in the bearing, seizure from occurring when the rolling bearing is rotated, and also a polymeric lubricant packed rolling bearing in which such a solid polymeric lubricant composition is packed. As means for attaining the object, the kinematic viscosity of lubricating oil which is the base oil to be mixed with a polymer is set to be low or in a range of 10 to 200 mm 2 /s at 40° C., and an extreme pressure additive and/or an antiwear agent is blended with the lubricating oil. Therefore, the viscosity of the solid polymeric lubricant composition (polymeric lubricant) before solidification is lowered, so that the composition can spread to enter every corners and gaps in the bearing and the rotational torque of the bearing can be reduced. Furthermore, seizure can be prevented from occurring by the presence of the extreme pressure additive and/or the antiwear agent.

What is claimed is:  
     
         1 . A solid polymeric lubricant composition which is obtained by mixing a polymer with lubricating oil and solidifying said mixture, wherein 
 a kinematic viscosity of said lubricating oil is in a range of 10 to 200 mm 2 /s at 40° C., and an extreme pressure additive and/or an antiwear agent is blended with said lubricating oil.    
     
     
         2 . A solid polymeric lubricant composition according to  claim 1 , wherein a blending ratio of said extreme pressure additive and/or said antiwear agent to said lubricating oil is 0.5 to 10 wt %.  
     
     
         3 . A polymeric lubricant packed rolling bearing in which a plurality of rolling elements are rotatably placed between an inner race and an outer race, and a polymeric lubricant which is obtained by mixing a polymer with lubricating oil or grease and heating and solidifying said mixture is packed in a space formed between said inner race and said outer race, and said rolling elements, wherein 
 said polymeric lubricant is a solid polymeric lubricant composition according to  claim 1  or  2 .