Hoerbiger Hydraulik Gmbh

Hoerbiger Automatisierungstechnik Holding Gmbh

Klaus Schweiger

Gerhard Huber

Andreas Lechleiter

A hydraulic circuit for actuation of a hydraulic working cylinder () having a one-sided piston rod (), comprising a reversible pump () whereby both sides of said pump are connected via a supply line () and a first two-way valve () to the tank () containing hydraulic medium and through releasable control check valves () to the working cylinder (). Both sides of the arrangement are further connected respectively to a hydraulic closeable valve () through a discharge line () and also to the tank () through a replenishing suction line () having a corresponding suction valve (). Each of said hydraulic closeable valves () is controlled by the pump () through a second two-way valve (). The discharge line (or) of one side of the working cylinder () is connected to the respective discharge line (or) and/or replenishing suction line (or) at the opposite side of the working cylinder (), whereby the connected lines are connected to the tank () through an arrangement () comprising a check valve () blocking in the direction of the tank () and well as a pressurizing valve () opening in the direction of the tank () to ensure through simple means the complete filling of the system with hydraulic medium even during manual operation.

Hydraulic circuit for actuation of a hydraulic working cylinder

A double-action hydraulic cylinder ( ) is provided with an axially slidable piston between a front cover and a rear cover, whereby the piston may be coupled to an extreme load through a piston rod ( ) and whereby the piston may be biased via connections ( ) for a hydraulic medium at both sides with the hydraulic medium from an extreme pressure source. The connections ( ) are attached to the cylinder barrel ( ) by means of soldered joints to achieve a good surface finish and thereby also an optically appealing appearance together with a reliable mounting of the pressure connections.

Hydraulic cylinder

An actuation arrangement for movable components on vehicles, particularly for trunk lids or hoods, doors, vehicle tops and top covers, including at least one hydraulic cylinder ( ) pivotably coupled to a cylindrical pivot pin ( ) on the vehicle and/or on the movable vehicle component, and having at least one line ( ) for the pressure medium in at least one working chamber ( ) of the hydraulic cylinder. To allow pivoting of the hydraulic cylinder principally at any angle with low space requirements and a low risk of damage to the hydraulic lines, one section ( ) of each pressure medium line passes through the pivot pin ( ) essentially in an axial direction and at least one passage leads from the pivot pin ( ) to at least one working chamber ( ) of the hydraulic cylinder ( )

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Steingaden, Germany

Klaus Schweiger