Oil film rigidity-adjustable fluid dynamic and static pressure slide bearing

Abstract

The invention relates to an oil film rigidity-adjustable fluid dynamic and static pressure slide bearing. The bearing comprises a front static pressure oil cavity, an upper static pressure oil cavity, a lower static pressure oil cavity, a dynamic pressure cavity, three oil inlet holes, three axial oil return grooves and an oil supply system; the three oil inlet holes are respectively communicated with the front static pressure oil cavity, the upper static pressure oil cavity and the lower static pressure oil cavity, and are connected with the oil supply system; a wedged cavity is formed between the upper static pressure oil cavity and the dynamic pressure cavity; and the section of the wedged cavity is an Archimedes spiral oil cavity molded surface. The bearing overcomes and makes up the defects of other dynamic and static pressure slide bearings, preferably solves the wear problem caused by friction contact with the dynamic and static pressure bearing during starting of a main shaft, has the prominent characteristic of adjustability of oil film rigidity, and facilitates guarantee of revolving precision of a main shaft system and prolonging of service life.

Description

technical field [0001] The invention relates to a fluid dynamic and static pressure sliding bearing for the spindle of a machine tool, in particular to a fluid dynamic and static pressure sliding bearing suitable for the spindle system of a heavy-duty, high-speed, precision numerical control machine tool. Background technique [0002] Bearings are one of the key basic parts that affect the machining accuracy of machine tools, and the improvement of their rotation accuracy, anti-vibration performance and dynamic rigidity has attracted more and more attention. In addition to rolling bearings, a considerable number of machine tool spindle systems currently use dynamic pressure sliding bearings and static pressure sliding bearings. In the hydrostatic sliding bearing, once the oil supply system is started, the main shaft and the bearing are in the state of liquid lubrication, the bearing is less affected by the relative speed, and the speed change has a wide range of applications...

AI Technical Summary

Problems solved by technology

The patent No. ZL200520074843.2 is a dynamic and static pressure sliding bearing for the main shaft of the grinding wheel of the roll grinder. Its bearing structure is three static pressure oil chambers and one dynamic pressure oil chamber. It relies on the joint action of the four oil chambers to bear the external load when starting and working. , making better use of the mixed effect of the dynamic and static pressure sliding bearings, but the dynamic and static pressure sliding bearings of this structure will wear due to the friction contact between the main shaft and the bearing during the start-up stage of the main shaft, and at the same time, the rigidity of the bearing oil film under operating conditions Affected by the change of the spindle speed, its size cannot be adjusted arbitrarily

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