Patent ID: 9279494
Filing Date: 2016-03-08
CPC Classification: F15B,F16H,Y10T

Claim Text:
1. A device for controlled translational movement of a gear shift fork, used particularly for an automobile gearbox; the device comprising said gear shift fork, a hydraulic cylinder having a stationary cylindrical shaft with a stationary transverse wall projecting from an external surface of said shaft, a piston which is translationally movable by sliding on said stationary transverse wall said piston comprising a piston body closed by a plug in such a way as to define two internal chambers of the cylinder, which are located respectively on opposite sides of said stationary transverse wall; said device further including means for pressurizing fluid of both of the chambers of the cylinder in order to move the piston in one direction or the other; the piston body being directly integrated with the gear shift fork so that, under the effect of the pressure in one of the chambers of the cylinder, the fork moves translationally; said plug being attached axially to the piston body by screwing, said plug having a threaded axial bore which threadedly engages an axial thread on an external surface of the piston body; and a tightening socket provided on an opposite lateral side of the plug with respect to the piston body so as to allow the screwing of the plug on the piston body.