High-speed oil-gas lubrication electric spindle achieving precise oil supplying

Abstract

The invention discloses a high-speed oil-gas lubrication electric spindle achieving precise oil supplying, and belongs to the technical field of electric spindles. The overall electric spindle comprises a shell, and a stator is fixed in the shell; a front bearing chamber and a back bearing chamber are connected to the two ends of the shell respectively, and two bearings are connected in series in each bearing chamber, wherein the two bearings are separated through an inner bearing isolation pad and an outer bearing isolation pad; a central spindle is supported by the front bearings and the back bearings and provided with a rotor matched with the stator; each bearing is provided with an oil-gas lubrication oil line; annular cooling grooves are formed in the front bearing chamber and the shell respectively; the bearing shell is provided with oil-gas inlets and an oil-gas outlet, an oil-gas pipeline penetrates through the shell, the bearing chambers and the outer bearing isolation pads, the tail end of the pipeline is provided with an oil-gas nozzle, and each bearing is provided with an independent oil delivery line, an independent nozzle and an independent oil return line. Accordingly, by designing the independent oil-gas lubrication oil lines, nozzles and oil return lines, precise control over oil-gas lubrication parameters of the bearings is achieved, the lubricating effect of the bearings is improved, and the performance of the electric spindle is enhanced.

Description

technical field [0001] The invention relates to an electric spindle, in particular to a high-speed electric spindle using oil-air lubrication for precise oil supply. Background technique [0002] With the development of high-speed machining technology, the manufacturing industry has higher and higher requirements on the speed of machine tools. As the core component of the machine tool, the electric spindle is also developing towards high speed. The rotary motion of the electric spindle mainly depends on the supporting bearings at both ends of the mandrel. The speed and bearing capacity of the bearings directly affect the performance of the electric spindle. [0003] Lubrication is a key factor affecting the performance of bearings. Traditional electric spindle bearing lubrication methods are mostly grease lubrication and oil lubrication. Most of these lubrication methods are excessive lubrication, which not only wastes resources, but also generates additional frictional to...

AI Technical Summary

Problems solved by technology

[0004] But at present, many oil-air lubricated electric spindles have low oil supply accuracy. One oil circuit is often used to supply oil to two bearings at the same time, and the same oil-air lubrication parameters are used for different bearings.

If one oil circuit is used to supply oil to two bearings at the same time, if the design is unreasonable, the oil supply to the two bearings will be uneven. Since oil-air lubrication is minimal lubrication, it is easy to cause insufficient oil supply to the bearings, resulting in sintering of the bearings; due to different bearing models , different working conditions, the actual required oil-air lubrication parameters are different, if the uniform lubrication parameters are adopted, it is easy to cause excessive oil supply to some bearings and increase the temperature rise of the bearings

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