A built-in preload adjustable single-sided film throttling static pressure lead screw pair

Abstract

The invention discloses a static lead screw pair internally provided with adjustable pre-pressing one-sided films for throttling, and relates to the technical field of static screw driving. The staticlead screw pair comprises a lead screw and a nut matched with the lead screw. The nut comprises an inner sleeve, an outer sleeve, adjustment devices, springs and a plurality of films, wherein the inner sleeve is matched with the outer sleeve, the adjustment devices and the springs are arranged on the inner sleeve, and the films are fixed through the inner sleeve and the outer sleeve. One end of each spring makes contact with the corresponding film, and the other end of each spring is fixed to the deep end of the corresponding adjustment device. The films are located between a groove A and a groove B. The static lead screw pair has the beneficial effects that independent work of oil cavities is achieved, and the defect of poor throttling performance caused by inconsistent gaps between theoil cavities is overcome; one-sided film throttle devices are arranged in the nut, so that the length of a sensitive oil path is decreased, and the dynamic throttling characteristic is improved; the response sensitivity of film throttling is much better than that of sliding valve throttling; and vibration of the films in work can be eliminated, so that deformation changes of the films are stable,and pressure-feedback active compensation is better achieved.

Description

technical field [0001] The invention relates to the technical field of static pressure screw transmission, in particular to a built-in preload adjustable single-sided film throttling 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 threa...

AI Technical Summary

Problems solved by technology

However, the feedback effect of the spool valve is realized by the movement of the spool valve, and because the flow rate is only inversely proportional to the first power of the throttle length of the spool valve, and the movement of the spool valve depends on the deformation of the balance spring to balance the force, so Poor sensitivity of spool valve feedback

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