Patent ID: 7988082

Claim:
A gyratory crusher, comprising: a crushing head fixedly attached to an upper portion of a substantially vertical shaft, on which crushing head a first crushing shell is mounted; a frame on which a second crushing shell is mounted, said second crushing shell and said first crushing shell defining a crushing gap therebetween; at least one adjusting device for adjusting the width of said crushing gap by changing a vertical position of the first crushing shell relative to a vertical position of the second crushing shell; and a driving device being arranged to rotate an eccentric assembly arranged about the lower portion of the shaft so as to cause the crushing head to perform a gyratory pendulum movement for crushing material that is introduced in the crushing gap, wherein the gyratory crusher comprises a space adapted to contain liquid, which space is defined by a piston, which is formed at least partly of the lower end of the shaft, a cylinder, which is formed at least partly in the eccentric assembly, and a bottom element, said space being adapted to form a cushion with the aid of said liquid, so that said cushion serves as a thrust bearing transmitting vertical forces from the crushing head to the bottom element.