Improvement of a ball locking device for controlling a gearbox

摘要

The device (1) has a metallic tube (2) fixed on a wall (18) of a crank case, and including a lock ball (4) guided axially and pressed towards an inside of the case by a helicoidal spring (8) to cooperate with grooves (32) of a slide rod (30). An end of the tube turned towards an outside of the case is closed. A radial communication hole (20) is formed on the tube to communicate the inside of the tube with an inner volume of the case. The ball is maintained partially in the tube by radial constriction (22) of the end of the tube located in the case.