A dual-redundancy electric steering gear

Abstract

The invention discloses a dual-redundancy electric steering engine which is composed of two motors, a planetary gear transmission reducing mechanism, a planetary pin roller lead screw pair and a sleeve push rod; the working principle of a planetary differential gear train is utilized to transmit movement from the two motors to the sleeve push rod through driving the planetary pin roller lead screw pair by the planetary gear transmission reducing mechanism, and rotary movement of a lead screw is converted to straight reciprocating motion of the sleeve push rod through revolution and rotation of a pin roller. The dual-redundancy motors and the planetary pin roller lead screw pair are adopted for driving to realize large stroke and ensure straight line actuation property of an actuator; the planetary pin roller lead screw pair has the characteristics of high carrying capacity and accurate positioning of reciprocating motion; when one motor breaks down, the other motor can still drive a system to act normally so as to improve the reliability of the system; when the two motors work normally, power confluence is realized to provide larger input power for the system; and the dual-redundancy electric steering engine is simple in structure, convenient to maintain and excellent in speed regulation property.

Description

Technical field [0001] The invention belongs to the technical field of electric steering gears, and specifically relates to a double-redundancy electric steering gear driven by a motor. Background technique [0002] The steering gear is actually a position following system. The currently widely used steering gear systems can be divided into pneumatic steering gears, hydraulic steering gears and electric steering gears according to different power sources. Compared with pneumatic steering gear and hydraulic steering gear, the electric steering gear system has the characteristics of high reliability, high efficiency, light weight and better maintainability. Therefore, the electric steering gear system will become an important direction of the future steering gear system development. [0003] The rapid development of UAV requires its control system to have high precision, high sensitivity and high reliability. The steering gear system is an indispensable key component of the flight ...

AI Technical Summary

Problems solved by technology

Because most of the electric steering gear is in the frequent real-time working state in flight control, especially under the condition of high frequency and high aerodynamic load, it is prone to failure, which will cause the object controlled by the steering gear to lose control, causing serious harm and economic loss

At the same time, due to the limitation of the installation space of the steering gear, the electric steering gear cannot use high-power motors, resulting in limited multi-stage output power

At present, the commonly used electric steering gear systems are mostly double-redundant designs: that is, the double-redundancy design of the drive circuit or the double-redundancy design of the motor windings, but the steering gear is realized by using dual motors plus a planetary differential gear train and a planetary roller screw pair. There are few examples of double-redundancy design; patent CN202364049U discloses "a dual-motor drive device for steering gear", which uses ordinary screw nuts to drive, and the direction of the output shaft is perpendicular to the direction of the motor spindle, the stroke is short, and the load-carrying capacity Limited and not easy to install and maintain

Images