Patent ID: 7673821

Claim:
A gyratory crusher, comprising: a crushing head; a first crushing shell mounted on the crushing head; a frame; a second crushing shell mounted on the frame; the second crushing shell and the first crushing shell defining a crushing gap therebetween, the width of the gap being adjustable by changing a vertical position of the first crushing shell relative to a vertical position of the second crushing shell by way of at least one adjusting device; a driving device arranged to cause the crushing head to perform a gyratory pendulum movement with a view to crushing a material that is introduced in the crushing gap; wherein the gyratory crusher includes a space for holding a liquid, the space being defined by a piston and a cylinder, said piston being formed at least partly of or substantially of a vertical shaft around which the crushing head is arranged, the space being adapted to form, with the aid of said liquid, a cushion, thereby enabling said cushion to act as a thrust bearing and transmit vertical forces from the crushing head to the frame, wherein vertical forces are transmitted directly from the crushing head to the cushion and then to the frame without being passed through any horizontal bearing plates.