A nut-driven hydrostatic screw pair

Abstract

The invention discloses a nut drive type static pressure lead screw pair, and relates to the technical field of static pressure spiral transmission. The nut drive type static pressure lead screw paircomprises a lead screw and a static pressure nut which are mutually matched, and further comprises static pressure composite bearings arranged at the two ends of the static pressure nut. Each static pressure composite bearing comprises at least one annular oil cavity formed in the axial end portion of the static pressure composite bearing, connected with the static pressure nut and used for achieving axial supporting of the static pressure nut, an annular oil supply groove A formed in the axial end portion of the static pressure composite bearing, connected with the static pressure nut and used for supplying oil to an oil film oil supply groove, and at least three radial oil cavities which are formed in the radial direction of the static pressure composite bearing, matched with the lead screw and used for achieving radial supporting of the static pressure nut. The nut drive type static pressure lead screw pair has the beneficial effects that limitation on the feeding speed due to the lead screw shaft critical rotation speed is avoided; reasonable oil supply of the nut drive type static pressure lead screw pair is achieved, and direct connection between an oil pipe and the static pressure nut is avoided; and axial and radial static pressure supporting of the static pressure nut is achieved, and the superior performance of the static pressure lead screw pair is improved.

Description

technical field [0001] The invention relates to the technical field of static pressure screw transmission, in particular to a nut driven static pressure lead screw pair. Background technique [0002] With the continuous development of CNC machine tools in the direction of high speed, heavy load, and precision, the most widely used ball screw pair in this field has gradually exposed some inherent defects due to its own structure, such as contact wear, high-speed collision, and heavy-load pitting. And so on, and the difficulty and cost of solving are getting bigger and bigger. People began to turn their attention to linear motors and hydrostatic screw pairs. [0003] Although the linear motor has advantages in high speed, its control system is complex, technically difficult, poor in anti-interference, and high in cost, which greatly limits its popularization and application. There is a layer of pressure oil film between the threaded surface of the lead screw and the nut of t...

AI Technical Summary

Problems solved by technology

In the screw drive type hydrostatic screw pair, the rotation speed of the screw is limited by the critical speed of the slender screw shaft, which seriously restricts the improvement of the feed speed. In addition, in large and heavy CNC machine tools, the screw Its own weight is much larger than that of the nut, and the rotating inertia force of the screw is very large, resulting in serious heat generation, deformation and energy consumption

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