Thomas Magnete Gmbh

Hp Hydraulik S.p.a.

Andrea Gambetti

Thassilo Maxeiner

The aim of the invention of for the hydrostatic drive to enable a lowering of the feed pressure provided by the feed pump and, at the same time, to effect a supply of the adjustment unit of the drive that is proper with respect to the pressure and the delivery rate. This aim is achieved in that the adjustment unit () of the drive is supplied with hydraulic energy by an electrohydraulic supply unit (), wherein the supply unit () consists of an electric motor () and an auxiliary pump () coupled thereto and wherein the outlet of the auxiliary pump () is connected to the adjustment unit () directly or by means of a check valve (). Hydrostatic drives according to the invention are used, for example, in self-propelled working machines.

Hydrostatic drive having a closed circuit and method for operating the drive

A drive, which permits a lowering in the feed pressure provided by the feed pump and, at the same time, effects a supply to the displacement unit of the drive which meets the demand with regard to pressure and delivery volume. This is achieved in that the displacement unit () is supplied with hydraulic energy by an electro-hydraulic supply unit () wherein the supply unit () comprises a hydraulic reservoir () and a non-return valve () and is connected to the feed pressure limiting valve (), which is implemented as an electrically adjustable pressure limiting valve, wherein the hydraulic reservoir () is also connected to an electro-hydraulic pressure sensor (), which outputs the electric signal thereof to an electric auxiliary controller (), and wherein the electric auxiliary controller () drives the feed pressure limiting valve (). These hydraulic drives are used for example, in self-propelled working machines.

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Rangone, Italy

Andrea Gambetti