Solid cage for roller bearings

Details Solid cage for roller bearings Solid cage for roller bearings

1998-11-23

2001-03-06

Footland, Lenard A. (Department: 3682)

Bearings

Rotary bearing

Antifriction bearing

Reexamination Certificate

active

06196728

ABSTRACT:

BACKGROUND OF THE INVENTION
It is already known from U.S. Pat. No. 2,327,237 that the guide surfaces on the webs of a cage can be made concave to fit the lateral surface of the roller. The radially inward and outward edge areas of the webs thus wrap around part of the roller and form a positive interlock which holds the roller in position. The degree of positive engagement depends on the radial position of the roller in the cage, that is, on the position of the pitch circle of the rollers with respect to the outside lateral surface of the cage and its bore. In addition, there must be at least one circumferential area where the edges of the webs wrap only slightly around the roller, so that it is possible to insert the rollers into the cage or so that, by taking advantage of the elasticity of the cage, the rollers can be snapped into place. For the sake of good lubrication, the guide surfaces themselves are optimized with respect to their curvature and the gap between them and the lateral surface of the roller. To make sure that the lubricant is properly distributed, the edge areas should not scrape the lubricant off the roller when the cage sags. This is not guaranteed in the known cage.
SUMMARY OF THE INVENTION
According to the invention, therefore, the task of the invention is to improve the solid cage cited above in such a way that, while ensuring good lubricant distribution and minimizing the sag of the cage, almost no lubricant is scraped off the roller.
The task is accomplished in that the guide surface is interrupted by at least one strip-like section, which is curved to form an arc facing the roller. In the radially outward area of the cage, this strip is recessed into the guide surface, whereas, in the radially inward area, it projects outward beyond the guide surface to serve as an additional retaining projection for the roller.
The guide surface in this case is designed to fit the curvature of the roller almost completely and thus is designed for optimum lubrication. Under certain operating conditions, the cage would in this case sag or shift out of center to such an extent that its upper areas of the webs and the edge areas on the outside lateral surface would rest on the rollers. Lubricant would thus be scraped off. To prevent this, the invention creates a radially inward-pointing, auxiliary retaining projection, which, when the cage sags, rests with a relatively narrow footprint on the lateral surface of the roller and greatly reduces the sag of the cage. The arc-shaped section of strip found in this position also forms a V-shaped lubricant groove in the web, which improves the lubrication at this location.


REFERENCES:
patent: 2327237 (1943-08-01), Baden
patent: 4629339 (1986-12-01), Morinaga
patent: 5214850 (1993-06-01), Motohashi et al.

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