Patent ID: 7055664
Filing Date: 2006-06-06
Classification: F16D

Abstract:
1. A device for coupling two shafts which are intended for rotating substantially about an axis with respect to a casing, the device comprising: a dog clutch making it possible for one of the shafts to drive the other and clutch release means making it possible to uncouple the dog clutch from a clutch engagement position toward a clutch release position: wherein the clutch release means comprise a screw secured to one of the shafts, a nut secured to a flywheel and cooperating with the screw, the screw and the nut having an axis coinciding substantially with the axis of rotation of the shafts, and a brake for braking the rotation of the flywheel with respect to the casing in that, in the clutch engagement position, the braking of the flywheel slackens the nut of the screw and drives one of the shafts in translational motion along said axis, so as to uncouple the dog clutch, in that the brake comprises a friction element intended for rubbing against a surface of the flywheel and means for controlling the brake, and in that the friction element is formed by a helical spring, the inside diameter of which is variable as a function of the tension of the helical spring.