Patent ID: 9328728
Filing Date: 2016-05-03
CPC Classification: F04B,F16H

Claim Text:
1. A hydrostatic positive displacement machine which is operable in a closed circuit and delivers hydraulic fluid into a working circuit, comprising: a control device comprising a variable displacement piston device comprising a first control pressure chamber and a second control pressure chamber, wherein the control device is in an operative connection with a displacement volume control mechanism, wherein the control pressure chambers of the variable displacement piston device are connectable by a control valve with a feed pressure source or are relieved to a reservoir, wherein the positive displacement machine and the feed pressure source are driven by a drive machine, wherein the positive displacement machine includes a swivel-back device which, in the event of a decrease of feed pressure from the feed pressure source, provides actuation of the positive displacement machine′ toward a reduction of a displacement volume, wherein the swivel-back device comprises at least one pressure sequence valve, which is in communication on an input side with the working circuit of the positive displacement machine, wherein in the event of a decrease in the feed pressure from the feed pressure source below a limit pressure, the pressure sequence valve supplies the control device of the positive displacement machine with hydraulic fluid from the working circuit, and wherein when the feed pressure from the feed pressure source is above the limit pressure, the pressure sequence valve blocks the connection between the working circuit and the control device, and the control device is supplied with hydraulic fluid from the feed pressure source.