Electric spindle of bidirectional herringbone groove hydrodynamic/hydrostatic integrated gas bearing support

Abstract

The invention discloses an electric spindle of a bidirectional herringbone groove hydrodynamic / hydrostatic integrated gas bearing support. The electric spindle comprises a rotating shaft, front and rear radial hydrodynamic / hydrostatic integrated gas bearings, an intercepting hole, spiral grooves, an exhaust hole, an axial orifice, a thrust collar, front and rear thrust gas bearings, front and rear air inlets, a shell, a motor rotor, a motor stator, a cooling water tank and a rear end cover, wherein the front and rear ends of the rotating shaft are supported by the front and rear radial hydrodynamic / hydrostatic integrated gas bearings respectively; the spiral grooves which can rotate in a bidirectional mode are machined in the front and rear radial hydrodynamic / hydrostatic integrated gas bearings. By adoption of a bidirectional herringbone groove bearing, forward rotation or reverse rotation can be realized; the electric spindle is supported through the hydrodynamic / hydrostatic integrated gas bearings, bearing wear caused by dry friction in the process of starting and stopping a liquid hydrodynamic bearing is overcome under the condition that the bearing structure is not changed, the service life of the spindle and the bearing is prolonged, and the precision of the spindle and the bearing is improved. Moreover, the load is supported by fully utilizing a hydrodynamic effect of the hydrodynamic gas bearing, and the bearing force and stability are improved.

Description

technical field [0001] The invention relates to a spindle unit applied to a numerically controlled machine tool in the field of electromechanical engineering, in particular to an electric spindle supported by a bidirectional herringbone groove dynamic and static pressure integrated gas bearing. Background technique [0002] With the advancement of processing technology, CNC machine tools have higher and higher requirements for the speed and precision of the electric spindle unit. However, rolling bearings have high friction and wear and short life, and are gradually not suitable for high-speed working conditions; magnetic suspension bearing technology is immature, expensive, and complex in structure, and cannot be used on a large scale; liquid sliding bearings have high bearing capacity and rigidity, but liquid damping Large, high calorific value, so the speed is limited; while the gas bearing uses gas as lubricant, and the non-contact support method of gas makes the frictio...

AI Technical Summary

Problems solved by technology

In reverse rotation (pump-out type), the situation is reversed, where the load-carrying capacity and stability of the bearing air film is reduced

Therefore, one-way herringbone groove bearings cannot be used under the condition of changing direction

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