Static-pressure spindle

Abstract

The invention discloses a static-pressure spindle. The static-pressure spindle comprises a shell and a rotation shaft which is rotatably matched in the shell through transverse bearings; and a thrust bearing is arranged in the shell. The static-pressure spindle is characterized in that the thrust bearing comprises a first sub component and a second sub component which apply axial balancing force to the shaft shoulder of the rotation shaft; the first sub component and the second sub component are separately provided with a working oil groove; each working oil groove is matched with a corresponding shaft shoulder end surface to form a main oil cavity; the first sub component and the second sub component are separately provided with an oil inlet branch path which is used for supplying oil to the corresponding working oil groove; the main oil cavities separately communicate with a first auxiliary oil cavity and a second auxiliary oil cavity; and the first sub component and the second sub component are separately provided with an oil supplementing system which provides the oil to the corresponding main oil cavity through the first auxiliary oil cavity when the rotation speed of the rotation shaft is increased to a critical value. According to the static-pressure spindle provided by the invention, static-pressure bearings can serve as the transverse bearings for use, so that the precision is high; the friction force is small; and the axial limiting effect is good.

Description

technical field [0001] The invention relates to the technical field of spindles, in particular to a static pressure spindle. Background technique [0002] The hydrostatic spindle refers to the sliding friction between its rotating shaft and the bearing through oil, that is to say, the bearing of the hydrostatic spindle is a hydrostatic bearing, and the hydrostatic bearing is a kind of sliding bearing, and its working principle is Pressurized lubricant is forcibly pumped into the tiny gap between the bearing and the shaft by means of a pressure pump. Most hydrostatic bearings in the prior art are radial bearings, which are rarely used in axial bearings. The reason is that when the hydrostatic bearing is a radial bearing, the oil will adhere to the inner surface of the bearing as the shaft rotates and move in the circumferential direction, so it can have a good lubrication effect, but when the hydrostatic bearing is used as a shaft When the bearing is used, it is also called...

AI Technical Summary

Problems solved by technology

This is why most of the hydrostatic bearings in the industry are radial bearings and cannot be promoted on thrust bearings

However, the existing thrust bearings, such as thrust ball bearings and thrust roller bearings, all have problems with the accuracy and rigidity of the line contact between the roller and the shoulder.

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