公开(公告)号：EP3385536A1

公开(公告)日：2018-10-10

申请号：EP18165932.7

申请日：2018-04-05

Applicant: Danfoss Power Solutions Inc.

Inventor： FRANTZ, Stephen

IPC: F04B49/00 ,  F03C1/06 ,  F03C1/40 ,  F16H61/46

CPC classification number: F15B13/02 ,  B60T13/245 ,  F03C1/0668 ,  F03C1/0686 ,  F04B49/002 ,  F15B11/04 ,  F16H61/423 ,  F16H61/46 ,  F16H61/47

Abstract: A hydraulic unit includes a driving mechanism whose displacement volume is adjustable to two operational states by means of a positionable adjustment element. The adjustment element can be positioned by a servo piston of a servo unit into a first, initial position and a second, operative position. A first front face and a second front face of the servo piston, which are opposing each other, can be pressurized individually with pressurized hydraulic fluid in order to position the servo piston at either end position of a servo cylinder of the servo unit. The servo piston is of a stepped design thereby forming a ring-shaped damping surface opposing the first front face. In the servo cylinder a ring-shaped shoulder surface is formed opposing the damping surface such that a damping volume is formed in the servo cylinder by the damping surface, the shoulder surface and the servo cylinder.