Patent ID: 8240587

Claim:
A gyratory crusher, comprising: a crushing head arranged rotatably about a substantially vertical shaft and on which a first crushing shell is mounted; a frame, on which a second crushing shell is mounted, which second crushing shell, together with the first crushing shell, delimits a crushing gap; a supporting piston arranged inside a cavity of said shaft and which supports the crushing head and is displaceable in a vertical direction to adjust a width of the crushing gap; an eccentric, which by means of at least one radial bearing, is arranged rotatably about the shaft; a driving device arranged to rotate said eccentric to cause the crushing head, which is arranged rotatably on the eccentric, to execute a gyratory pendulum movement for crushing of material introduced into the crushing gap; and an oil line, arranged in the cavity and extending through a piston plate included in the supporting piston, for supplying lubricating oil to a lubricating oil chamber, said lubricating oil chamber configured at least partially in said cavity above the piston plate, the lubricating oil chamber being connected to one or more of the at least one radial bearings by a duct arranged in the shaft.