High-speed movable bearing in particular for the mounting of a main spindle of a machine tool

Abstract

According to the invention, the high-speed moving bearing (1) is embodied as an automatically-compensating movable ball bearing with several adjacent races of balls (6, 7, 8, 9, 10) with operation-dependent radial thermal expansion of the bearing rings (2, 3), the bearing rings (2, 3) of which are only in supporting contact with one ball race (8) in the cold state for the high-speed movable bearing (1), by means of a convex embodiment of the running surfaces (5) for the roller bodies (4) on the inner bearing ring (2). With increasing thermal expansion and expansion due to centrifugal force of both bearing rings (2, 3), the further ball races (6, 7, 9, 10) come sequentially into such a contact position with both bearing rings (2, 3) as a result of an elastic radially-flexible embodiment of both bearing rings (2, 3), that the bearing rings (2, 3) at the operating temperature for the high-speed moving bearing (1) are in supporting contact with all ball races (6, 7, 8, 9, 10).

Description

technical field [0001] The invention relates to a high-speed floating bearing according to the preamble of claim 1 , which can be used particularly advantageously for supporting machine tool spindles or for supporting other rapidly rotating machine components. Background technique [0002] It is generally known to those skilled in the field of rolling bearing technology that at least two bearings arranged at a predetermined distance from one another are required for guiding and supporting rotating machine components. If the shaft is usually supported in two radial bearings, the problem arises that the distances of the individual bearing seats on the shaft and in the housing only match within the limits of manufacturing tolerances. Furthermore, the shaft generally heats up more than the housing under operating conditions, so temperature-induced length differences of the shaft at the bearing point must also be compensated. It has long been possible to effectively compensate f...

AI Technical Summary

Problems solved by technology

[0005] Although a ball bearing of this type overcomes the radial thermal expansion of the bearing ring due to operation through its defined radial play, it has the disadvantage that it has only a low load-carrying capacity and is therefore less susceptible to so-called crash accidents. , where the bearing is suddenly subjected to very high point loads, prone to material damage and eventually to outright failure

It has been proven in practice that even the specified radial clearance of the bearing is still not sufficient to avoid overloading of the bearing in the event of a large heat drop from the inner bearing ring to the outer bearing ring, so that with such bearings even in a two-row configuration It is not possible to ensure regular and precise radial spindle guidance in any operating state of the bearing

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