Self-locking high-thrust linear actuator driven by inertial principle and its actuation method

Abstract

The invention discloses a self-locking high-thrust linear actuator driven based on inertial principle and an actuating method. The actuator comprises an actuator base, a rhombus driving structure, piezoelectric ceramic, an upper limiting bearing, a lower limiting bearing, a lead screw sleeve, a lead screw output shaft, a top cover and a limiting cover plate. The actuator controls the voltage and the voltage change rate of the piezoelectric ceramic to drive the rhombus driving structure to generate the elastic deformation with different rates, realizes the inertia type driving principle throughthe friction force between the rhombus driving structure and the lead screw sleeve and drives the lead screw sleeve to complete rotating motion, and the rotating motion is converted into the axial linear motion of the lead screw output shaft after being driven by a lead screw pair. Compared with the inertia type and inchworm type working principles driven by other piezoelectric materials, the linear motion is achieved through the lead screw pair transmission, the ratio of the thrust of the actuator to the thrust-weight ratio of the mass of the actuator is larger, the bearings bear the axial stress of the actuator, and the power-off locking capacity is higher.

Description

technical field [0001] The invention relates to an actuating device, in particular to a large-thrust linear actuator driven by an inertial principle and capable of self-locking when power is off, and an actuating method thereof. Background technique [0002] In recent years, the continuous development of piezoelectric actuators has supported the development and construction of important industries such as national defense, aerospace, and machinery manufacturing, and has also derived a wide variety of piezoelectric actuators. However, due to the shortcomings of piezoelectric materials with small actuating strokes, It is difficult for piezoelectric ceramic actuators to achieve large-stroke output, and it is necessary to use different working principles to achieve large-stroke displacement output. Therefore, a variety of inchworm-type and inertia-type actuating output structures have been proposed, making the actuating device benefit from the high-precision displacement output ...

AI Technical Summary

Problems solved by technology

However, the current actuators driven by piezoelectric ceramics mostly use the frictional fit between the structural interfaces to achieve locking. On the basis of not installing a transmission structure, the output force of the actuator and the locking force are affected by the friction coefficient of the material and the preload friction. Due to the limitation of force, it is difficult to continue to increase the locking force, and the thrust-to-weight ratio of the actuator (the ratio of the thrust of the actuator to the mass of the actuator) is small

Images