Coupling for an AWD vehicle

A coupling for an all-wheel-drive vehicle, comprising

• a disc package with alternating discs, which are connected for rotation with, but are axially movable in relation to an ingoing and an outgoing axle, respectively, of the coupling, and
• a hydraulic piston for pressing the disc package together under the action of hydraulic pressure, hereby altering the coupling from a disconnect mode to a connect mode, in which the ingoing axle is connected to the outgoing axle,
• a coupling slack adjuster for mechanically establishing a rest position for the hydraulic piston in a disconnect mode, in which a predetermined slack in the disc package is established, irrespective of the wear of the discs,
• a primary slack adjuster sleeve, which by press fit connection to a member in the coupling and by working relationship with the piston is able to establish a new rest position for the piston during its return stroke from a connect mode to a disconnect mode, governed by a too long stroke of the piston during its working stroke and under the action of a spring with a lower force than the force of the press fit,
• wherein the member is a press ring connected to the piston, and wherein the movement of the sleeve together with the press ring from a disconnect mode to a connect mode of the coupling being limited by contact with a secondary slack adjuster sleeve attached to a housing of the coupling,
• wherein the primary slack adjuster sleeve and the secondary adjuster sleeve are so shaped that the primary sleeve is axially guided by the secondary sleeve and wherein a return spring or disconnect spring is arranged between the two sleeves.