Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
2002-01-03
2003-10-21
Bucci, David A. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C384S513000, C384S445000, C384S490000
Reexamination Certificate
active
06634792
ABSTRACT:
The invention relates to the field of so-called “rigid” single row ball bearings.
Such bearings comprise an outer ring equipped with a toroidal raceway on its bore, an inner ring equipped with a toroidal raceway on its external surface, a row of balls arranged between the two raceways, in contact with said raceways, the profile of the raceways being symmetric with respect to a plane passing through the center of the balls, a cage in the form of an annular element with a certain number of cavities intended to house the balls and space them apart circumferentially in an appropriate way to avoid any imbalance when the bearing is running, and possibly sealing members in the form of seals or flanges arranged on one or both sides of the bearing so as to prevent any ingress of contaminants from the outside and prevent any leak of lubricant to the outside of the bearing.
Such bearings are known and used in many applications.
In order to make for easier sourcing and interchangeability of such bearings from one manufacturer to another, the dimensions relating to the parameters defining the size and fitting of these bearings have been standardized to give so-called “ISO” series of bearings.
These series call upon basic four-figure designations (6000, 6200, 6300 series) common to all bearing manufacturers, nominal size dimensions (D=outside diameter, d=bore and B=width) identical across all manufacturers corresponding to each basic designation.
The user thus has standard ranges of bearings available which makes his choice easier and ensures that the bearings will be interchangeable.
The functional life of a bearing is not tied only to the basic bearing material but depends also on the lubricant used and on the other elements which make up the bearing, such as the cage or the sealing members.
While conventional bearings in the ISO range are entirely satisfactory in most applications, failures through lack of lubrication or through excessively short grease life have been observed in certain instances.
These are mainly applications relating to the field of electric motors, in which the bearing is not very heavily loaded with respect to its load-bearing capacity but is running at high speed and at relatively high temperatures.
In this type of application, it is usually the qualitative or quantitative degradation of the grease, rather than the load-bearing capacity of the bearing which governs the bearing life. Attempts at preventing failures may be made by using, for example, so-called “open” (flangeless and seal-less) bearings lubricated with grease and which are periodically repacked, which is expensive.
One of the objects of the invention is to propose a new range of bearings better suited to these applications, having overall size dimensions identical to those of the conventional ISO bearings, but with internal construction features that make it possible to guarantee a high service life by virtue of excellent lubrication with grease held in by effective sealing.
The ball bearing device according to the invention is of the type comprising an outer ring equipped with an outer surface and with a bore on which a toroidal inner raceway is formed, an inner ring equipped with a bore and with a cylindrical outer surface on which a toroidal outer raceway is formed, a row of balls arranged between the two raceways, and a cage capable of keeping a uniform circumferential spacing between the balls. The ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the diameter of the balls is between 0.4 and 0.7. The ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the radial thickness of the inner ring taken between the bottom of the outer raceway and the bore of the inner ring is between 1.1 and 1.6.
In other words, by comparison with conventional ISO bearings, the diameter of the balls is smaller, the radial thickness of the outer ring is greater at the bottom of the raceway and the radial thickness of the inner ring at the bottom of the raceway is kept more or less the same.
Advantageously, the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the outside diameter of the bearing is between 0.045 and 0.08.
Advantageously, the ratio between the width of the rings and the diameter of the balls is between 1.3 and 2.2.
Advantageously, the ratio between the width of the rings and the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring is between 2.5 and 4.2.
As a preference, the values of the outside diameter of the bearing, of the inside diameter of the bearing, and of the width of the bearing are identical to those of a conventional single row rigid ball bearing of the standardized ISO range.
In one embodiment of the invention, the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the diameter of the balls is between 0.5 and 0.6, in that the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the radial thickness of the inner ring taken between the bottom of the outer raceway and the bore of the inner ring is between 1.1 and 1.5, in that the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the outside diameter of the bearing is between 0.045 and 0.06, in that the ratio between the width of the rings and the diameter of the balls is between 1.7 and 2.2, and in that the ratio between the width of the rings and the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring is between 3 and 4.2, the values of the outside diameter of the bearing, of the bore of the bearing, and of the width of the bearing being identical to those of a conventional single row rigid ball bearing of the 6000 series of the standardized ISO range.
In another embodiment of the invention, the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the diameter of the balls is between 0.4 and 0.7, in that the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the radial thickness of the inner ring taken between the bottom of the outer raceway and the bore of the inner ring is between 1.2 and 1.6, in that the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the outside diameter of the bearing is between 0.055 and 0.75, in that the ratio between the width of the rings and the diameter of the balls is between 1.5 and 1.9, and in that the ratio between the width of the rings and the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring is between 2.5 and 4, the values of the outside diameter of the bearing, of the bore of the bearing, and of the width of the bearing being identical to those of a conventional single row rigid ball bearing of the 6200 series of the standardized ISO range.
In another embodiment of the invention, the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the diameter of the balls is between 0.4 and 0.55, in that the ratio between the radial thickness of the outer ring taken between the bottom of the inner raceway and the outer surface of the outer ring, and the radial thickness of the inner ring taken between the bottom of the outer raceway and the bore of the inner ring is between 1.3 and
Fierling Yannick
Girardin Carole
Gorenne Michel
Bucci David A.
SKF France
Smith Julie K.
Smith Gambrell & Russell
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