US 2019/0170163 A1Published application

Electrohydraulic drive unit

AssigneeHoerbiger Automatisierungstechnik Holding GmbH

InventorsStefan GUTH, Martin RAUWOLF

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Abstract

An electrohydraulic drive unit is provided, comprising a cylinder-piston assembly having a piston-side first hydraulic working chamber and a piston-rod-side second hydraulic working chamber, a tank, a hydraulic pump, which can be driven at variable rotational speed and which has a tank connection point and a working connection point, a valve assembly, which is connected between the working connection point of the hydraulic pump and the cylinder-piston assembly, and an anti-cavitation valve, which is connected between the tank and the first hydraulic working chamber; and a machine controller. Switching valves of the valve assembly can be switched between loading of the first hydraulic working chamber and loading of the second hydraulic working chamber of the cylinder-piston assembly during pumping operation of the hydraulic pump from the working connection point of the hydraulic pump by the machine controller.

Claims11

Dependent claims

An electrohydraulic drive unit, especially for use on a machine press, having

a cylinder-piston arrangement (1) having a first hydraulic working chamber (5) on the piston side and a second hydraulic working chamber (6) on the piston-rod side
a tank (4) as a hydraulic-fluid reservoir,
a hydraulic pump (3) driven at variable rpm by an electric motor (2) and having a tank port (T) and a working port (P),
a valve arrangement connected between the working port (P) of the hydraulic pump (3) and the cylinder-piston arrangement (1) and comprising several electrically activatable switching valves (S1-S6),
a servo-suction valve (8) connected between the tank (4) and the first hydraulic working chamber (5) of the cylinder-piston arrangement (1),
and a machine controller acting on the switching valves (S1-S6) and on the electric motor (2), by means of which the switching valves (S1-S6) can be reversed between pressurization of the first hydraulic working chamber (5) and of the second hydraulic working chamber (6) of the cylinder-piston arrangement (1) in pumping mode of the hydraulic pump (3) from its working port (P),
wherein a hydraulic decompression module (9) having a hydraulic accumulator (10), which can be placed in communication with the second hydraulic working chamber (6) via a first connecting line (11) having a pressure-limiting valve (15) having flow direction from the second hydraulic working chamber (6) to the hydraulic accumulator (10) and via a second connecting line (12) having a check valve (16) opening in flow direction from the hydraulic accumulator (10) to the second hydraulic working chamber (6).

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/268,126Filed 5 Feb 2019
Priority: DE 10 2016 118 853.05 Oct 2016
Published: 6 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

F15B 11/022
Systems essentially incorporating special features for controlling the speed or the actuating force of an output member: in which a rapid approach…
B30B 15/163
Control arrangements for fluid-driven presses: for accumulator-driven presses
B30B 15/20
Controlling the reciprocating motion of the ram: controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes
F15B 1/02
Installations or systems with accumulators; Supply reservoir or sump assemblies: installations or systems with accumulators

Family

Application16/268,126Continuation
US 10,662,976 B2Related patent
US 2019/0170163 A1This patent

From the US filing history. Foreign family members aren’t listed.

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