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1. (WO2017021080) HYDRAULIC DRIVE FOR EXECUTING A LINEAR MOVEMENT

Pub. No.:    WO/2017/021080    International Application No.:    PCT/EP2016/065758
Publication Date: Fri Feb 10 00:59:59 CET 2017 International Filing Date: Wed Jul 06 01:59:59 CEST 2016
IPC: F15B 20/00
F01D 21/18
Applicants: VOITH PATENT GMBH
Inventors: GOLL, Armin
Title: HYDRAULIC DRIVE FOR EXECUTING A LINEAR MOVEMENT
Abstract:
The invention relates to a hydraulic drive (1) for executing a linear movement, having a motor (2), a pump (3), a lifting cylinder (4) that has a linearly movable piston (5) and a cylinder housing (6) having at least one first connection (8) and at least one second connection (9), a spring (7) which is arranged such that, in the relaxed state of the spring (7), the piston (5) is extended or retracted, and having at least one first valve (10) by means of which the first connection (8) and the second connection (9) of the cylinder housing (6) can be fluidically connected. Also provided is at least one second valve (11) which is connected in parallel with the first valve (10), wherein the first valve (10) has a maximum volumetric throughflow that is greater than the maximum volumetric throughflow of the second valve (11).