Actuator cylinder

Abstract

The invention discloses an actuator cylinder which comprises a motor (3), a speed reducer (4), a synchronous transmission mechanism, a transmission mechanism, an outer cylinder (16), a piston rod (18) and an in-position mechanism, wherein the motor (3) is connected to one end of the speed reducer (4); the other end of the speed reducer (4) is connected with the transmission mechanism of the outer cylinder (16) through the synchronous transmission mechanism; the transmission mechanism comprises a ball screw (11) and a ball screw nut (13), wherein the ball screw is installed in the outer cylinder (16) and extends along the axis of the outer cylinder (16), and the ball screw nut is sleeved on the ball screw; the ball screw nut (13) is connected with the piston rod (18); and the outer cylinder (16) is provided with the in-position mechanism. The actual cylinder is characterized in that the actuator cylinder also comprises an emergency driving mechanism, because a pneumatic emergency driving mechanism is provided, the dual-redundancy design of the actuator cylinder is realized, the function loss of the actuator cylinder when a circuit is in fault and the motor can not work is avoided, the reliability is improved, and the use safety requirement is satisfied.

Description

technical field [0001] The invention relates to an actuator as a driving mechanism, in particular to an actuator driven by a motor. Background technique [0002] The traditional actuator is to control the movement of the piston rod in the actuator through hydraulic pressure. One application of the actuator is to use it as a driving mechanism on the aircraft landing gear retractable device. With the development of electronic technology, electric control technology has entered the On the stage of history, in the mid-1980s, the electric actuator was verified and applied on the American C-141 aircraft. Now the linear actuator on the civil aviation aircraft is also used in other parts of the aircraft as the driving mechanism. Its work The principle is as follows: the rare earth permanent magnet brushless motor is energized and rotated as the power drive source, and the ball screw screw pair is driven to rotate through the first-stage differential planetary gear train and the seco...

AI Technical Summary

Problems solved by technology

When the piston rod is stretched out or retracted to the limit position, the gear mounted on the ball screw will drive the cam on the gear shaft to decelerate through the 3-stage reduction gear to compress and cut off the power switch to stop the motor. At the same time, the position switch outputs the limit position signal of extending or retracting, and at the same time, the arbitrary position of the piston rod can be monitored by detecting the output voltage of the feedback potentiometer installed on the camshaft of the position switch. The linear actuator on the existing civil aviation aircraft has The following disadvantages: the motor is the only driving source, and the redundancy design is generally not considered. Even if there is, it is realized through the circuit redundancy, which cannot avoid the loss of function of the actuator after the motor fails.

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