A linear actuator driven by a roller screw

Abstract

A roller screw drive linear actuator is characterized by comprising a screw (1), a screw gear (11), a roller (6), planet carriers (4 and 9), a nut (3), an external nut (7) and a lug (15). Pitch and number of internal thread of the nut (3) are equal to those of thread of the screw (1). Lead of the roller (6) is equal to that of the internal thread of the nut (3). The part of the internal thread of the external nut (7), meshing with the thread of the lug (15), is subjected to gear shaping for the left internal thread, and shaped teeth mesh with the external gear of the screw gear (11), while drive ratio of the shaped teeth is equal to that of the whole roller screw drive linear actuator. The roller screw drive linear actuator is simple in structure, stable in transmission, small in transmission clearance, high in transmission precision, low in noise, high in dynamic responsiveness and constant in transmission ratio and enables speed closed-loop control and displacement closed-loop control to be simpler.

Description

technical field [0001] The invention relates to the technical field of mechanical structures, in particular to a linear actuator driven by a roller screw. Background technique [0002] The electromechanical servo actuator system has been gradually used in various military and civilian industries such as aerospace, aviation, machine tool processing, etc. The electric servo system is easy to obtain energy, low cost, high reliability, and convenient to use and maintain. However, due to the limitation of the magnetic saturation and temperature rise of the motor, the output torque of the motor is limited, and its torque-inertia ratio is small, so it is difficult to meet the fast and high dynamic response of the servo mechanism. At the same time, in order to meet the output torque requirements, the traditional structure generally adopts the scheme of motor and ball screw acceleration and deceleration device, and the deceleration device decelerates to increase the torque, which wil...

AI Technical Summary

Problems solved by technology

The electric servo system is easy to obtain energy, low cost, high reliability, and convenient to use and maintain. However, due to the limitation of the magnetic saturation and temperature rise of the motor, the output torque of the motor is limited, and its torque-inertia ratio is small, so it is difficult to meet the fast and high dynamic response of the servo mechanism. At the same time, in order to meet the requirements of output torque, the traditional structure generally adopts the scheme of motor and ball screw acceleration and deceleration device, and the deceleration device decelerates to increase the torque, which will cause the actuator to be too large and the power-to-mass ratio will be reduced

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