Rolling bearing

Abstract

The frequencies generated based on the undulations existing on the inner and outer ring raceways 8, 10 and on the rolling surface of the balls 11, 11 are out of coincidence with the rotational frequency itself of the rotation member supported by the rolling bearing, and with a frequency component which is a multiple of the rotational frequency, or kinds of frequencies generated due to the undulations are out of coincidence with each other in the natural frequency domain of a rotation system which is a rotation supporting portion having the rolling bearing incorporated therein, whereby without using a special grease, the self-excited frequency of the rolling bodies hardly grows to abnormal vibration, and a rolling bearing having sufficient durability and causing no abnormal vibration and noise even if used at low temperature is realized.

What is claimed is:  
     
         1 . A rolling bearing comprising a first race having a first raceway, a second race having a second raceway, and Z rolling bodies having a rolling surface and rollably disposed between the first raceway and the second raceway, wherein, when assumed that n is a positive integer, and that vibration is generated at frequencies due to the circumferential undulations of (nZ) waves and (nZ+1) waves existing on the surface of the first and second raceways, and the undulation of (2n) waves existing on the rolling surface of the respective rolling bodies, the frequencies are out of coincidence with the rotational frequency itself of the rotation member supported by the rolling bearing, and with a frequency component which is a multiple of the rotational frequency.  
     
     
         2 . A rolling bearing comprising a first race having a first raceway, a second race having a second raceway, and Z rolling bodies having a rolling surface and rollably disposed between the first raceway and the second raceway, wherein, when assumed that n is a positive integer, and that vibration is generated at kinds of frequencies due to the circumferential undulations of (nZ) waves and (nZ±1) waves existing on the surface of the first and second raceways, and the undulation of (2n) waves existing on the rolling surface of the respective rolling bodies, the kinds of frequencies are out of coincidence with each other in the natural frequency domain of a rotation system which is a rotation supporting portion having the rolling bearing incorporated therein.  
     
     
         3 . A rolling bearing comprising a first race having a first raceway, a second race having a second raceway, and Z rolling bodies having a rolling surface and rollably disposed between the first raceway and the second raceway, wherein, when assumed that n is a positive integer, and that vibration is generated at frequencies due to the circumferential undulations of (nZ) waves and (nZ+1) waves existing on the surface of the first and second raceways, and the undulation of (2n) waves existing on the rolling surface of the respective rolling bodies, the frequencies are out of coincidence with the rotational frequency itself of the rotation member supported by the rolling bearing, and with a frequency component which is a multiple of the rotational frequency, and kinds of frequencies generated due to the undulations are out of coincidence with each other in the natural frequency domain of a rotation system which is a rotation supporting portion having the rolling bearing incorporated therein.  
     
     
         4 . The rolling bearing of one of  claims 1  to  3 , wherein the frequencies or frequency components to be compared with each other have differences at least 1% of the frequencies or frequency components.