Bearings,Ball bearings-Ningbo Zhenhai Bearing Manufacturer

The object of the invention is therefore to provide a ball bearing in which the unit comprising the bearing ring and the cage runs smoothly, in particular at high rotational speeds, in which the guidance of the cage on the bearing ring is adequately lubricated and in which the cage runs on the guide with little friction.

This object is achieved by the characterizing part of claim 1 and a further independent claim and also by the refinements thereof.

The invention is preferably suitable for guiding the cage on an outer bearing ring, enclosing the cage with the balls, but also for guiding on the inner bearing ring. In this case, the run-on surface is formed on the low shoulder or directly on a bearing ring without a low shoulder. The low shoulder is set back from the high shoulder radially with respect to the bearing ring. Alternatively, the run-on surface is formed directly on a bearing ring without a low shoulder. The invention is suitable in particular for angular-contact ball bearings of a high-precision design for the mounting of spindles. The contact angle of these bearings preferably lies in a range from 12¡ã¨Q to ¨Q35¡ã.

The run-on surface is not aligned parallel to the axis of rotation in the axial direction (in an imaginary longitudinal section viewed along the axis of rotation), but instead runs at an angle to the axis of rotation. In the peripheral direction, the run-on surface is annularly formed or is divided in the peripheral direction into surface portions or is divided up into a number of run-on surfaces. Similarly, the guiding surface formed on the flange of the cage is annularly formed or interrupted in the peripheral direction or divided in the axial and/or peripheral direction into a number of guiding surfaces.

During operation, the guiding surface runs against the obliquely directed run-on surface. An axial force on the cage is thereby deliberately produced, preventing the cage from tilting about the tilting axes. Deep Groove Ball Bearing The cage runs more smoothly in the rotating bearing.

The guiding surface on the cage may also remain aligned parallel to the axis of rotation or, as an alternative to this, also be inclined in relation to the axis of rotation and correspond to the path followed by the run-on surface with an at least approximately equal distance from the run-on surface. In the case of the last-mentioned configuration of the invention, when there is direct contact with the run-on during operation of the bearing, the distance is equal to zero or preferably determined by a defined gap size of a dimension formed uniformly between the surfaces. In the gap determined by the gap size between the run-on surface and the guiding surface, a hydrodynamic lubricating film can form, advantageously reducing the friction and the wear on the cage guide to virtually zero.

The invention also provides that, in all operating conditions, even under the most adverse operating conditions of the bearing, a smallest possible radial gap size greater than zero remains between the guiding surface and the run-on surface. This gap size also makes allowance for the fact that the cage may increase in diameter as a result of centrifugal forces, that there may be a radial offset between the center axis of the cage and the axis of rotation of the bearing and that the diameters of the cage may change on account of changes in volume by liquids, such as water or oils.