A lens propulsion actuator

Abstract

The invention relates to the technical field of electric servo systems, and particular to a lens pushing-in execution mechanism. The lens pushing-in execution mechanism comprises a transmission gear, a ratchet wheel, a pawl, a mounting end cover, a harmonic speed reducer housing, a servo motor, a harmonic speed reducer output shaft, a lens mounting cabin and a rack, wherein a harmonic speed reducer is adopted as a speed reducing mechanism, and the servo motor is mounted on the harmonic speed reducer housing; the ratchet wheel and the transmission gear are sequentially mounted between the mounting end cover and the outmost end of the harmonic speed reducer output shaft; and the rack is arranged on the connecting surface of the lens mounting cabin and the lens pushing-in execution mechanism, and the rack is engaged with the transmission gear. When in operation, the servo motor drives the harmonic speed reducer to do rotational motion, the harmonic speed reducer output shaft drives the ratchet wheel and the transmission gear which are fastened thereon to rotate simultaneously, the transmission gear pushes the rack, so as to push out the lens mounting cabin; and when a lens is completely pushed out, the servo motor is power off, and the pawl automatically slides toward the bottom part of a ratchet wheel tooth groove when pushing the ratchet wheel, so as to prevent the lens mounting cabin from retracting backwards.

Description

technical field [0001] The invention belongs to the technical field of electric servo systems, and in particular relates to a lens propulsion actuator. Background technique [0002] During the flight of the missile, when the target needs to be imaged, the lens device will protrude from the inside of the missile body. After the lens device is ejected, in order to prevent it from being blown back to the tail compartment by aerodynamic force, an anti-reversal function is required. When the lens device is fully extended, there are the following three options to choose from: (1) Servo the lens cabin to this position through the controller; (2) The motor of the reducer adopts a servo motor with a brake function, and by controlling the brake The lens compartment is fixed at this position; (3) a ratchet mechanism is adopted, and when the lens compartment reaches the designated position, the ratchet of the ratchet mechanism prevents the lens compartment from falling back. [0003] ...

AI Technical Summary

Problems solved by technology

[0005] Scheme 3 requires the use of a ratchet mechanism, which is more complicated in design, but it uses a mechanical structure to prevent reversal, has higher reliability, and the return error is controllable. However, no specific technology for Scheme 3 has been disclosed so far.

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