公开(公告)号：US20190217373A1

公开(公告)日：2019-07-18

申请号：US16092871

申请日：2017-03-31

Applicant: SMS group GmbH

Inventor： Karsten BUSCH ,  Paul-Josef NIESCHWIETZ ,  Frederik KNAUF

IPC: B21J9/12 ,  F15B15/14 ,  F15B11/02

CPC classification number: B21J9/12 ,  F15B11/022 ,  F15B11/036 ,  F15B15/1428 ,  F15B15/1447 ,  F15B2211/428 ,  F15B2211/7055 ,  F15B2211/75 ,  F15B2211/775

Abstract: A hydraulic cylinder comprising a cylinder, a piston element movably guided in the cylinder in a working direction and comprising an active surface, and a first opening for feeding a fluid into a cylinder chamber by the active surface. A working pressure of the fluid acting on the active surface drives the piston element in the working direction. The active surface includes a first partial surface and at least one second partial surface, the cylinder chamber being divided into a first sub chamber with the first opening by the first active surface and a second partial surface with a second opening by the second partial surface, and the partial surfaces are hydraulically separated from each other at least in a selectable operating mode.