Bearings – Rotary bearing – Antifriction bearing
Patent
1999-01-27
2000-07-11
Hannon, Thomas R.
Bearings
Rotary bearing
Antifriction bearing
384450, 384569, F16C 3336, F16C 3358
Patent
active
060862629
ABSTRACT:
A rolling bearing satisfies at least one of following requirements(1)-(4). (1) The radius r.sub.c of curvature at the joint between the head portion and the chamfered portion of said rolling element shall be not less than 0.2 mm. (2) The roughness (.sigma..sub.1.sup.2 +.sigma..sub.2.sup.2)1/2 resulting from the central line average roughness .sigma..sub.1 of the head portion of said rolling element and the central line average roughness .sigma..sub.2 of the main collar surface of the bearing ring shall be not more than 0.3 .mu.mRa. (3) The dimension y.sub.c of the chamfered portion lying between the head portion and the rolling surface of said rolling element in the direction along the diameter of said rolling element shall be not less than the height y.sub.k of the border line in the relief groove on the main collar surface of the bearing ring from the surface of the track. (4) The radius r.sub.k of curvature at the joint between the main collar surface and the chamfered portion of the bearing ring shall be not less than 0.2 mm. Accordingly, the life of a bearing in operation lubricated with a lubricant contaminated by water can be drastically prolonged.
REFERENCES:
patent: 1727576 (1929-09-01), Umstattd
patent: 3827771 (1974-08-01), Fernlund
patent: 4802775 (1989-02-01), Takata
patent: 4877340 (1989-10-01), Hoeprich
patent: 5007747 (1991-04-01), Takeuchi et al.
patent: 5921685 (1999-07-01), Isimaru et al.
Hannon Thomas R.
NSK Ltd.
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