Rolling bearing

摘要

With the inner race and shaft fitted with a clearance fit, the bearing satisfies the relation: t/w>0.5, where t is an inner race minimum thickness at a contact area between each rolling element and the inner race raceway, in the direction perpendicular to the raceway, and w is the circumferential distance between adjacent rolling elements (w=π×SD/Z, Z is the number of rolling elements, and SD is the bearing inner diameter). With the outer race and housing fitted with a clearance fit, the bearing satisfies the relation: t/w>0.5, where t is the inner race minimum thickness at a contact area between each rolling element and the outer race raceway, in the direction perpendicular to the raceway, and w is the circumferential distance between adjacent rolling elements (w=π×LD/Z, LD is the bearing inner diameter).

主权项

1. A rolling bearing comprising an outer race having a raceway, an inner race having a raceway, and rolling elements disposed between the raceways of the outer race and the inner race, wherein the inner race is formed with a bore through which a shaft can be fitted,
wherein the bearing is designed and configured such that with the shaft fitted through the bore of the inner race, when a bearing load is applied between the outer race and the shaft and due to the bearing load, a peak load P is applied to the inner race from one of the rolling elements which receives a largest portion of the bearing load among the rolling elements, a first circumferential surface pressure distribution generated on the inner race by the one of the rolling elements circumferentially overlaps with each of second circumferential surface pressure distributions generated on the inner race by respective rolling elements circumferentially adjacent to the one of the rolling elements, and wherein the bearing is further designed and configured to satisfy one of below-identified first to third relations:first relation:
t/w>0.5where t is a minimum thickness of a portion of the inner race where the rolling elements contact the raceway of the inner race, in a direction perpendicular to the raceway of the inner race; and
w=π×SD/Z where Z is the number of the rolling elements; andSD is an inner diameter of the bearing;second relation:
σmid>σmax/2where σmid and σmax are minimum and maximum values, respectively, of a combined circumferential surface pressure distribution which is a combination of the first circumferential surface pressure distribution and the second circumferential pressure distributions; andthird relation:
σ1/4<σ2 where σ2 is a surface pressure value applied to the inner race from the one of the rolling elements at a crossing point where a curve representing the first circumferential surface pressure distribution crosses a curve representing each of the second circumferential surface pressure distributions; andσ1 is a maximum value of the first circumferential surface pressure distribution, and
wherein σ1 and σ2 are given by:
σ1=2qt3/{πt4}andσ2=2qt3/{π(t2+s2)2}where t is a minimum thickness of a portion of the inner race (2) where the rolling elements (3) contact the raceway (2a) of the inner race (2), in a direction perpendicular to the raceway (2a) of the inner race;
q=P/L; and s=π××SD/(2Z)where L is an axial effective contact length between the one of the rolling elements and the raceway of the inner race;Z is the number of the rolling elements; andSD is an inner diameter of the bearing.