Mechanical drive structure

Abstract

A mechanical drive structure comprises a swing arm and an anti-backlash ring component, the swing arm is connected with a ball screw nut and a rudder shaft, the anti-backlash ring component sleeves a poking rod of the ball screw nut and is positioned in the swing arm, a first offset rail and a second offset rail are adjacently arranged in a through hole of the swing arm, a horizontal symmetric center line of the first offset rail and a horizontal symmetric center line of the second offset rail are not on the same horizontal plane, the anti-backlash ring component comprises a first anti-backlash ring and a second anti-backlash ring which sleeve on the poking rod, the first anti-backlash ring is positioned in the first offset rail, the second anti-backlash ring is positioned in the second offset rail, and the perpendicular distance between the horizontal symmetric center line of the first offset rail and the horizontal symmetric center line of the second offset rail is H. According to the mechanical drive structure, rolling motion between the poking rod of the screw nut and the swing arm is achieved, and matched gap between the poking rod of the screw nut and the swing arm can be adjusted based on decrease of frictional force.

Description

Technical field [0001] The invention relates to a mechanical transmission structure. Background technique [0002] Ball screw pairs are widely used in aircraft servo mechanisms due to their high efficiency, small size, and strong load capacity. The steering gear servo mechanism often cooperates with the ball screw nut through the rocker arm of the rudder shaft, and converts the linear motion of the nut into the swing of the rocker arm and the rudder shaft, and then drives the rudder surface to deflect. [0003] As non-linear factors in the control system, clearance and friction often cause a series of undesirable phenomena such as system response lag and oscillation instability. In previous designs, in order to convert the linear motion of the ball screw nut lever into the circular swing of the rocker arm, joint bearings are often installed between the lever and the rocker arm, or the lever is directly slid in the rocker arm slot. However, because the radial clearance of the bear...

AI Technical Summary

Problems solved by technology

However, since the radial clearance of the bearing itself cannot be eliminated, the existing clearance will easily cause the system to oscillate. Although the interference fit can eliminate the clearance, the bearing and the rocker arm are relatively sliding, and the interference additionally increases the pressure of the rocker arm and the lever. The sliding friction between them will increase the power consumption of the system and slow down the response

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