Locking device for ball screw

Abstract

The invention relates to a locking device of a ball screw. The locking device comprises a shell body (7), a coil (6), a screw nut (2), a brake disc (4) and a pressure spring (8). The coil (6) is arranged on the shell body (7), and the pressure spring (8) is arranged in the shell body (7). The shell body (7) is provided with the brake disc (4) which can move along a guide post pin and pass through the guide post pin (5). The axis of the brake disc (4) is in coincidence with that of the ball screw. One end of the pressure spring (8) is pressed on the shell body (7), and the other end of the pressure spring (8) is pressed on the brake disc (4). A friction disc (1) is arranged on the end face of the screw nut (2) of the ball screw, and a friction disc (3) corresponding to the friction disc (1) arranged on the end face of the screw nut (2) is arranged on the end face of the brake disc (4). Through action of the electromagnetic force and the pressure spring, moving and locking of the ball screw are realized, and a self-lock function of the ball screw is realized, and effect is good in actual application.

Description

technical field [0001] The invention relates to a locking device, in particular to a locking device for a ball screw. Background technique [0002] The electric mechanism of the aircraft rescue seat is used to adjust the lift of the seat pan, thereby controlling the position of the aircraft rescue seat. In the traditional electric mechanism, the actuator that converts the motor torque into linear motion usually adopts screw transmission, which has low transmission efficiency, large volume and weight, and high energy consumption. According to this situation, a structure using a ball screw pair is designed to replace the screw drive. This structure changes the sliding friction of the original screw drive to rolling friction, which reduces the friction force and requires less power. The efficiency is increased by 3 times, and at the same time, the volume, weight and energy consumption of the electric mechanism are greatly reduced. However, the structure of the ball screw pair...

AI Technical Summary

Problems solved by technology

However, the structure of the ball screw pair cannot be self-locking, and it cannot prevent the screw nut from rotating at the moment of ejection of the lifesaving seat of the aircraft. It is easy to cause a major accident, so it cannot meet the requirements of the ejection of the lifesaving seat, and cannot guarantee the safety of the pilot's life.

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