Built-in double-sided thin film throttling static pressure lead screw pair

Abstract

The invention discloses a built-in double-sided thin film throttling static pressure lead screw pair and relates to the technical field of static pressure screw drive. The built-in double-sided thin film throttling static pressure lead screw pair comprises a lead screw and a nut. The nut comprises an inner sleeve and outer sleeve matched with each other and a plurality of thin films; pairs of static pressure oil cavities A and static pressure oil cavities B are formed in the inner spiral surface where the inner sleeve is matched with the lead screw, and each pair of the static pressure oil cavities A and static pressure oil cavities B is located on two sides of a same threaded surface of the lead screw; grooves B corresponding to grooves A one by one and fixing the thin films jointly withthe grooves A are formed in the inner cylindrical surface of the outer sleeve, the grooves B are connected to an oil supply device through a primary oil supply channel, and oil via holes are formed inthe centers of the thin films. The built-in double-sided thin film throttling static pressure lead screw pair disclosed by the invention has the beneficial effects that the oil cavities work independently to avoid the defect that the throttling performance is bad as a result of inconsistent gaps of the oil cavities; the reaction sensitivity of thin film throttling is much higher than that of slide valve throttling, complex oil supply pipelines are avoided, the length of a sensitive oil path is reduced, and the throttling performance is improved.

Description

technical field [0001] The invention relates to the technical field of static pressure screw transmission, in particular to a built-in double-sided film throttling intermittent multi-oil cavity 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 betwee...

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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