Clamping force adjusting device for a clamp device

A clamping force adjusting device for a clamp device having a hollow housing supported directly or indirectly on a movable clamp part, a tension rod passing through the housing and being rotatable and slidable relative thereto, a first end of the tension rod being coupled to a force amplifier and a second end carrying a tension sleeve provided with an abutment flange, the tension sleeve acting axially on the housing through an adjusting sleeve axially adjustable by means of a fine thread, a thrust bearing and a plurality of Belleville springs, wherein the abutment flange is provided on an end of the tension sleeve adjoining the second end of the tension rod and the thrust bearing is provided on a side of the abutment flange facing away from the second end of the tension rod, wherein the Belleville springs are supported directly in the housing, wherein an intermediate sleeve is provided between the Belleville springs and the thrust bearing, abutting the thrust bearing at one end and abutting the Belleville springs at an other end, and wherein the adjusting sleeve can screw into a fine thread of the housing and has a radially inwardly directed first stop member on an end facing the Belleville springs, the first stop member so cooperating with a radially outwardly directed second stop member on the intermediate sleeve and a spacer ring bearing on the thrust bearing that the axial spacing of the first stop member form the second stop member and from the spacer ring is adjustable in the unstressed state by screwing the adjusting sleeve relative to the housing, whereby the stroke of the intermediate sleeve which on tightening up to abutment of the first stop member on the second stop member and the spacer ring is adjustable.