Bearings – Rotary bearing – Antifriction bearing
Patent
1994-03-30
1995-05-23
Footland, Lenard A.
Bearings
Rotary bearing
Antifriction bearing
F16C 3346
Patent
active
054175020
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a cage for full-type roller bearings comprising pockets formed by crossbars, into which pockets peripheral sections of cylindrical rolling elements extend, the cage being arranged radially inside or outside of a pitch circle of the rolling elements.
Among other things, the load rating of rolling beatings depends essentially also on the number of rolling elements arranged therein. Full-type roller bearings contain the maximum number of rolling elements possible and therefore offer a theoretically optimum load rating. Due to the possibility of joggling of the cylindrical rolling elements, however, clear reductions in the load rating have to be tolerated. Another disadvantage of full-type rolling bearings is the friction between contiguous rolling elements at their points of contact at which their peripheral surfaces rub against each other in opposite directions of rotation. Moreover, the mounting of full-type roller bearings frequently proves to be problematic.
To eliminate these disadvantages, it is a common practice to refrain from using the maximum number of rolling elements possible and to utilize the space thus gained as compared to a full-type construction, to accommodate a cage which prevents the joggling of the cylindrical rolling elements and their rubbing against each other and which cage, moreover, retains the rolling elements together in a manner conducive to mounting.
During the rotation of a rolling bearing, the rolling elements alternately traverse a load and a non-load zone, the loading of the individual rolling elements increasing continuously starting from the entry into the load zone to reach the maximum value in the position of the peak-level rolling element. From there on, the load decreases till it is reduced to zero in the load-free zone. Corresponding to the rolling element loading, an elastic deformation of the raceways also results. This leads to the individual rolling elements having different speeds of rotation even with a constant rotational speed of the bearing. Even though these differences in speed are only minimal, they still cause a change in the distance between the individual rolling elements, particularly in the load zone. Due to the frictional forces between the rolling elements and their raceways, the rolling elements tend to bring about these changes in distance even against any existing resistances. Such resistances are constituted by the crossbars of the cage. In common types of cages, this implies a high loading of the crossbars and for this reason, one accepts a smaller number of rolling elements in order to be able to make the crossbars sufficiently wide so that they can withstand this loading. For the dimensioning of the crossbars in a cage construction for full-type rolling bearings, one is restricted to the space outside or inside the Ditch circle between any two closely adjacent rolling elements, a certain play between pockets also having to be taken into account. By the largest possible utilization of the space outside or inside the pitch circle between two mutually abutting rolling elements and the respective raceway, the highest possible strength of the crossbars is obtained.
A full-type roller bearing of the are-cited type is known from DE-OS 28 31 183. In this rolling bearing, one tolerates the increased friction caused by the opposing movement of the contiguous rolling element surfaces but obtains that the filigree-type cage at least retains the rolling elements in a position conducive to mounting. To couteract the described thrust forces of the rolling elements, the crossbars are given the largest possible cross-section, that is to say, also the width of the cage pockets is made as small as possible so that they only just about permit the rolling of the rolling elements. In such a construction, there exists the risk that the crossbars break for the reasons mentioned above, particularly if under high loading of the bearing, the differing rolling element speeds are accompanied by large forces.
The object of the invention is to provi
REFERENCES:
patent: 4613239 (1986-09-01), Hofmann et al.
Lechner Jurgen
Muntnich Leo
Seegers Hanns
Waldert Hartwig
Footland Lenard A.
Ina Walzalager Schaeffler KG
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