An electromechanical actuator with self-locking and infinitely adjustable effective stroke

Abstract

The invention discloses an electromechanical actuator with self-locking and infinitely adjustable effective stroke, which is composed of a casing, a power mechanism, a transmission device, an executive mechanism, a stroke adjustment mechanism, a self-locking mechanism and a sensor assembly. The power mechanism is located in the upper casing and is driven by a motor; the transmission device is gear transmission; the actuator is a push rod and a planetary roller screw pair structure. The stroke adjustment mechanism realizes the adjustable stroke by adjusting the positions of the two blocks that fit each other; the self-locking mechanism realizes the self-locking and non-self-locking states of the electromechanical actuator by controlling the engagement and separation of the opening and closing nut and the lead screw; the sensor It is a double redundant displacement sensor used to measure the displacement of the nut. The electromechanical actuator has the functions of self-locking and adjustable stroke, simple structure, which is conducive to increasing safety and reliability, and is economical, especially suitable for the aerospace field that requires high safety and reliability.

Description

technical field [0001] The invention relates to the technology of electrically driven electromechanical actuators, in particular to a self-locking electromechanical actuator with infinitely adjustable effective stroke. Background technique [0002] With the development of aviation and aerospace machinery and equipment towards all-electricity and multi-electricity, electromechanical actuators that can realize fast response, high-speed, high-precision and high-thrust linear motion are more and more widely used in aviation and aerospace machinery and equipment. [0003] At present, electromechanical actuators mostly use ball screws and planetary roller screws. Both ball screws and planetary roller screws are rolling friction force transmission. Compared with trapezoidal threads, they have the characteristics of low friction loss and high efficiency, but The self-locking function cannot be realized. When the rudder surface of the aircraft is subjected to shock vibration or airf...

AI Technical Summary

Problems solved by technology

[0004] Regarding self-locking electromechanical actuators, the article "Selective Self-Locking Actuator and ControlAllocation Approach for Thermal Load Minimization" published in the 38th issue of "Journal of Guidance, Control, And Dynamics" on June 6, 2015 introduced A self-locking structure of an electromechanical actuator. The self-locking mechanism realizes self-locking through the engagement of the split nut and the lead screw, but the linear bearing of the mechanism is located inside the housing, which is not conducive to installation and increases the overall volume and quality of the housing. , and the executive device of the mechanism is a roller screw, and its performance is inferior to that of a planetary roller screw in all aspects.

[0005] Regarding the electromechanical actuator with adjustable stroke, the invention patent 201620631195.4 proposes "a variable stroke electromechanical actuator". The actuator changes the output displacement through the variable stroke structure driven by the servo motor, but the output of this device is The change of displacement requires the help of a servo motor, which increases the complexity and weight of the structure, and this structure only changes the size of the output displacement, and does not change the effective stroke

[0006] Existing electromechanical actuators cannot realize self-locking function and effective stroke stepless adjustable function at the same time, and electromechanical actuators that can realize self-locking or change output displacement are larger in size and more complex in structure, and cannot adjust the effective stroke according to the workplace

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