Hydrostatic nut pair with internal variable throttling function

Abstract

The invention discloses a hydrostatic nut pair with an internal variable throttling function and relates to the field of precision machinery automation equipment. The hydrostatic nut pair with the internal variable throttling function comprises a lead screw and a nut which are mutually matched, wherein a first oil cavity and a second oil cavity are formed in the two sides of each inner thread tooth surface of the nut, and the radial section projections of both the first oil cavity and the second oil cavity are fan trapezoids; through the corresponding first oil cavity and second oil cavity, a hydrostatic oil film of lubricating oil can be formed between the lead screw and each tooth side surface of the nut; a groove used for communicating with the corresponding first oil cavity and the corresponding second oil cavity is formed in each internal thread tooth of the outer circle of the nut; a movable throttling part is mounted in each groove, and comprises a slide valve, a first elastic component and a second elastic component; an oil supply groove communicating with each groove is formed in the outer circle of the nut; an external sleeve is mounted on the outer circle of the nut in a matched manner; and an oil supply hole communicating with the oil supply groove is formed in the external sleeve. By adoption of the hydrostatic nut pair provided by the invention, not only can an oil supply pipeline be simplified, but also the throttling performance can be improved.

Description

technical field [0001] The invention relates to the field of precision mechanical automation equipment, in particular to an internal variable throttling static pressure nut pair. Background technique [0002] With the continuous development of CNC machine tools in the direction of high speed, heavy load, and precision integration, the contact wear, high-speed collision and heavy-load pitting of the rolling screw have become bottleneck problems; and the difficulty and cost of solving are also increasing. Although linear motors have advantages in high speed, their low load capacity, high technical difficulty and high cost greatly restrict their popularization and application. The hydrostatic screw can make up for the shortcomings of the rolling screw in terms of speed, load bearing, precision and wear, and become a more competitive transmission form for high-speed, heavy-duty, and precision applications. [0003] The hydrostatic nut pair utilizes the principle of hydrostatic ...

AI Technical Summary

Problems solved by technology

The disadvantage of this internal throttling static pressure lead screw nut is that throttling threads need to be manufactured on the lead screw and the nut, which increases the length of the nut, and due to the existence of pitch errors, the throttling characteristics are unstable and affect the transmission accuracy.

Images