Arrangement for the shifting of a multi-disk clutch for the locking of a transfer differential for the drive of two vehicle axles of a motor vehicle

Claim 1

A shifting device for the shifting, between an engaged and a released position, a multi-disc clutch for the locking of a transfer differential that can be driven by a driving machine, for the drive of two vehicle axles of a motor vehicle having a first spring means for shifting the multi-disc clutch into one of said positions and a hydraulic auxiliary force means for shifting the multi-disc clutch into the other of said positions, said first spring means and said hydraulic auxiliary force means shifting the multi-disc clutch via a pressure ring arranged movably in both directions of the multi-disc clutch axis and acting against one of two end clutch discs of the multi-disc clutch, a first counterbearing means mounted via an adjusting means to compensate for wear in the clutch discs of the multi-disc clutch by movement exclusively along the clutch axis in the direction toward the pressure ring relative to a first disc carrier that in a torsionally fixed way holds at least one of the clutch discs of the multi-disc clutch, said counterbearing means contacting against the other of the two end discs of the clutch discs, said auxiliary force means having an axially movable piston received in a non-rotatable cylinder acted upon by a working pressure chamber that is connected by a control valve to a working pressure line that can be pressurized by a working pressure and to a return line that leads to an essentially pressure-relieved storage tank and said axial piston having a drive connection means to said pressure ring, said first spring means shifting the multi-disc clutch into the engaged position; said adjusting means having a second spring means adjustable with respect to the disc carrier for limiting the movement of the first counterbearing means to only along the clutch axis toward the pressure ring; a second counterbearing means for supporting the pressure ring in the direction away from the first counterbearing means along the clutch axis; a second disc carrier discrete from said pressure ring and holding the remainder of the clutch discs of the multi-disc clutch; and a hydraulic throttling means arranged in the return line that upon a positioning of the control valve that brings the multi-disc clutch into the engaged position is connected to the working pressure chamber and to the pressure relieved storage tank.