Metso Minerals Industries, Inc.

Dean M Kaja

Mark K Torbett

Thomas G Braun

A cone crusher includes a stationary main shaft and an eccentric that rotates about the main shaft to cause gyrational movement of a head assembly to crush rock within a crushing gap. The cone crusher includes a lower head bushing in contact with an outer surface of the eccentric. The eccentric is formed with a contact pad to enhance the contact between the eccentric and the lower head bushing during a no-load condition. The contact pad includes a contact surface that is recessed from the outer surface of the eccentric to enhance contact during no-load conditions while maintaining full contact between the lower head bushing and the eccentric outer surface during full load, crushing conditions.

No-load bearing for a cone crusher

A rock crusher includes a bowl coupled to a frame and a head assembly coupled to the frame defining a crushing gap between the head assembly and the bowl. The rock crusher further includes a number of fixed displacement hydraulic motors adapted to rotate the bowl with respect to the frame and a hydraulic fluid source providing a flow rate of hydraulic fluid to the hydraulic motors. A hydraulic control valve is adapted to remove one of the hydraulic motors from operation, directing the hydraulic fluid to the remaining hydraulic motors. The flow rate of hydraulic fluid remains unchanged, thereby increasing the hydraulic fluid flow rate provided to and the speed of the remaining hydraulic motors.

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Milwaukee, WI, United States of America

Dean M Kaja