An inertia cone crusher comprising a body resting on a foundation over resilient dampers, an outer cone, and an inner cone arranged inside it on a spherical support, which form a crushing chamber between them connected to the finished product discharge area, with the aid of a slide bushing, an unbalance weight is mounted upon the drive shaft of the inner cone, its center of gravity adjustable in relation to the axis of rotation, the unbalance weight slide bushing is connected to a transmission disk coupling consisting of a driving half-coupling, a driven half-coupling, and a floating disk arranged between them, the transmission disk coupling is connected to a tooth gear and a counterbalance weight, which are in their turn installed upon the counterbalance weight's slide bushing, so that the gear, counterbalance weight, and the counterbalance weight's slide bushing form one moving "dynamic assembly," the "dynamic assembly" is installed on a fixed pivot resting on the flange, and can rotate around the pivot via a journal plain bearing (27,28), while the flange is rigidly fixed in the bottom part of the crusher body; characterized in that the journal plain bearing (27,28) is arranged between the flange and the counterbalance weight, and consists of a base ring resting on the flange and an upper ring supporting the counterbalance weight's slide bushing and the counterbalance weight itself; the base ring's inner radius being equal to the inner radius of the upper ring, equal to the inner radius of the counterbalanced weight's slide bushing, and equal to or more than the fixed pivot's outer radius; while the flange's top surface has a mating recess to install the base ring. a body resting on a foundation over resilient dampers, an outer cone, and an inner cone arranged inside it on a spherical support, which form a crushing chamber between them connected to the finished product discharge area, with the aid of a slide bushing, an unbalance weight is mounted upon the drive shaft of the inner cone, its center of gravity adjustable in relation to the axis of rotation, the unbalance weight slide bushing is connected to a transmission disk coupling consisting of a driving half-coupling, a driven half-coupling, and a floating disk arranged between them, the transmission disk coupling is connected to a tooth gear and a counterbalance weight, which are in their turn installed upon the counterbalance weight's slide bushing, so that the gear, counterbalance weight, and the counterbalance weight's slide bushing form one moving "dynamic assembly," the "dynamic assembly" is installed on a fixed pivot resting on the flange, and can rotate around the pivot via a journal plain bearing (27,28), while the flange is rigidly fixed in the bottom part of the crusher body; characterized in that the journal plain bearing (27,28) is arranged between the flange and the counterbalance weight, and consists of a base ring resting on the flange and an upper ring supporting the counterbalance weight's slide bushing and the counterbalance weight itself; the base ring's inner radius being equal to the inner radius of the upper ring, equal to the inner radius of the counterbalanced weight's slide bushing, and equal to or more than the fixed pivot's outer radius; while the flange's top surface has a mating recess to install the base ring.