Patent ID: 8783162

Claim:
A hydraulic driven turning device to be installed to a construction machine, comprising a first body, a second body turning in relation to the first body, a hydraulic cylinder attached from the first body and the second body to another body, a piston that is axially movable back and forth in the hydraulic cylinder via a hydraulic pressure medium, and a spiral part that is attached to the piston, the spiral part causing a rotational movement that can be transferred to be a turning movement of the another body, the piston being arranged to be non-rotating in the hydraulic cylinder by forming a cross section of the piston and the hydraulic cylinder to be deviant from a round form, and the hydraulic cylinder only having a part L 2 in relation to the spiral part that is deviant from the round form or is eccentric located regarding a cross section thereof, the part L 2 being the course of the piston.