Modular redundancy electromechanical actuators capable of being connected in series and in parallel

Abstract

The invention discloses modular redundancy electromechanical actuators capable of being connected in series and in parallel. A structure that a plurality of electromechanical actuators are connected in series or in parallel is adopted, the electromechanical actuators are taken as independent units, and a planetary roller screw pair is taken as an actuating mechanism; and a lead screw of each electromechanical actuator is fixedly connected with a coupler, a nut is in interference fit with a rotor and rotates along with the rotor, a pin roller rotates around the axis of a lead screw while beingdriven by the nut to rotate around the axis of the pin roller, the lead screw is driven by the pin roller to achieve linear output, and an end cover, a shell and a push disc are driven by the bearingto do translational motion. The plurality of electromechanical actuators are connected with a parallel device in parallel so that the power of the actuators can be concentrated and combined and outputthrough the parallel device, and power superposition is realized. Through the motion conversion relation of the lead screw and the nut, motion conversion is achieved in the mode that the nut serves as a driving piece to drive the pin roller and the lead screw; and flexible combination and assembly in series and parallel modes can be achieved according to use occasions.

Description

technical field [0001] The invention relates to the electric drive electromechanical actuator technology, in particular to a series-parallel modular redundant electromechanical actuator. Background technique [0002] Full electrification of mechanical equipment is the future development trend; electromechanical actuators, with their compact structure, no hydraulic oil source pollution, easy maintenance, and high efficiency, have become key devices that require linear servo actuation in mechanical equipment in the military and civilian industries. It is used in many fields such as aircraft rudder surfaces, erecting equipment, high-end CNC machine tools, medical equipment, precision instruments, and industrial robots. [0003] Most of the electromechanical actuators currently on the market have small power and limited strokes, and it is difficult to function in some heavy-load and large-stroke occasions; while some large electromechanical actuators are expensive, inconvenient ...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent 201210243168.6 proposes an electromechanical actuator. The electromechanical actuator expands its stroke through the series connection of two-stage planetary roller screw pairs, but the series connection of the electromechanical actuator belongs to the internal transmission mechanism of a single electromechanical actuator. In series, electromechanical actuators cannot be combined according to needs, and a single electromechanical actuator is too large to achieve simple modularization

In the invention patent 201910200494.0, an electromechanical actuator is disclosed. The two motors inside the electromechanical actuator are connected through an oval wheel, and the output is combined, which is equivalent to a parallel output, but the parallel connection of the electromechanical actuator belongs to a single electromechanical actuator. The parallel connection of the motors is double redundant, but the system output is still single redundant; similarly, the electromechanical actuators cannot be freely combined according to the needs, and the volume of a single electromechanical actuator is too large

[0005] Existing electromechanical actuators cannot realize the series or parallel connection of multiple independent modules. The electromechanical actuators that can be connected in series or parallel internally are relatively large in size, and the degree of stroke and power superposition is limited. Series and parallel connections cannot be realized, and they can be flexibly combined and assembled according to requirements.

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