Patent ID: 6676297
Filing Date: 2004-01-13
Classification: F16C

Abstract:
A rolling bearing comprising a first race having a first raceway, a second race provided around the first race and having a second raceway, Z rolling bodies having a rolling surface and rollably disposed between the first raceway and the second raceway, and a retainer for holding the rolling bodies, such that under grease lubrication, the first race rotates at the frequency of fr (Hz) while the rolling bodies held in the retainer rotate at the frequency of fb (Hz) and revolve at the frequency of fc (Hz), wherein, when assumed that n, m, k and j are each a positive integer up to 100, respectively, that Da is the diameter of the rolling bodies, that dm is the pitch circle diameter of the rolling bodies, that &agr; is the contact angle between the rolling bodies and the first and second raceways and that vibration is generated at frequencies of mZfi, mZfiÂ±fr, nZfc, 2kfb and 2kfbÂ±fc due to the circumferential undulations of (mZ) waves and (mZ+1) waves existing on the surface of the first raceway, to the circumferential undulations of (nZ) waves and (nZÂ±1) waves existing on the surface of the second raceway and to the undulation of (2k) waves existing on the rolling surface of the respective rolling bodies, the formulas of (mZfj)â‰ jfr, (mZfiÂ±fr)â‰ jfr, (nZfc)â‰ jfr, (2kfb)â‰ jfr and (2kfbÂ±fc)â‰ jfr are satisfied for all of n, m, k and j with respect to the frequencies, where fi=frâˆ’fc (Hz), nZfc=(1/2)nfr{1âˆ’(Da/dm)cos &agr;}Z, mZfi=(1/2)mfr{1+(Da/dm)cos &agr;}Z, and 2kfb=kfr{1âˆ’(Da/dm)2cos2 &agr;}dm/Da.