Patent ID: 6763715
Filing Date: 2004-07-20
Classification: G01M

Abstract:
A locking and drive unit for a rotating body, in particular for motor vehicle wheels in a balancing machine, comprising:for supporting the rotating body (10) and rotating it about an axis A, a motorized main shaft (20) carrying flange means which define a counteracting surface (26) for the rotating body; pressing means (31, 32) coaxial with the shaft (20) to axially press the rotating body (10) against said counteracting surface (26) and to lock it relative thereto; a traction rod (40) associated with the main shaft (20) and movable axially relative thereto, and connected to the pressing means to pull them against the counteracting surface (26); elastic thrust means (45) connected to the traction rod (40) to axially pull, via the latter, the pressing means (31, 32) against the counteracting surface (26) to lock the rotating body (10) relative thereto; characterised by comprising an impact damping means (60) acting by mutual movement of two of its elements (61, 62) in the same direction as the axis (A) of the main shaft (20) when the traction rod (40) is moved in the sense of pulling the pressing means (31, 32) towards the counteracting surface (26), one of said elements (61, 62) being rigid with the main shaft (20) and the other element being rigid with the traction rod (40).