| 摘要 |
The invention provides: a polymeric lubricant packed bearing in which the sliding frictional resistance between a polymeric lubricant, and rolling elements or inner and outer races is sufficiently reduced, the rotational torque is small, and melting or damage of the polymeric lubricant due to self heating, and oxidation degradation of the base oil of the polymeric lubricant can be surely prevented from occurring; a method of efficiently producing such a polymeric lubricant packed bearing; and a method which can produce easily and stably a polymeric lubricant packed bearing having a structure in which a polymeric lubricant packed between inner and outer races of a double-row self-aligning roller bearing is axially divided in a gap between two rolling element rows so as to be independently rotatable. As means for realizing the above, a film 6 composed of grease (or a film 8 composed of a thickener for grease) is formed on a portion of the surface of each of components constituting the bearing, the portion being opposed to a polymeric lubricant 7, whereby the sliding frictional resistance between the bearing components and the polymeric lubricant 7 is reduced. In the formation of the grease film 6 (or the film 8 composed of a thickener for grease), a method is employed in which the assembled bearing in which the grease film 6 has not yet been shaped is immersed into a liquid which is obtained by diluting the grease (the thickener for grease) with a solvent, and the solvent is then dried, whereby the grease film 6 (or the film 8 composed of a thickener for grease) having a uniform thickness can be formed with high reproducibility. After a double-row self-aligning roller bearing is assembled, by using a feature of the self-aligning roller bearing that an outer race 2 is swingable with respect to an assembly configured by an inner race 1, rolling elements 3, and cages, in a direction perpendicular to the center axis of the bearing, raw materials of a polymeric lubricant are poured into and solidified in each of two regions of an annular space between the inner race 1 and the outer race 2 which is divided into the two regions. Thereafter, a polymeric lubricant packed bearing in which a pair of separated polymeric lubricants 7 are packed is easily obtained.
|
