A hydrostatic drive system has a travel drive (4) and working hydraulics (6). The working hydraulics (6) have a variable delivery pump (5) connected to the driving engine (1). The pump (5) is connected to a container (10) on the inlet side and delivers to a delivery line (11), to which at least one
A hydrostatic drive system has a travel drive (4) and working hydraulics (6). The working hydraulics (6) have a variable delivery pump (5) connected to the driving engine (1). The pump (5) is connected to a container (10) on the inlet side and delivers to a delivery line (11), to which at least one consumer of the working hydraulics (6) is connected. The pressure medium delivered by the pump (5) is feedable to a pressure valve (9). The pressure valve (9) is arranged in the delivery line (11) from the pump (5) to a control valve device (13; 15; 17; 18). A container branch line (29), which is connected to a container (10) and in which a circulating device (31) is arranged, is connected to the delivery line (11) downstream of the pressure valve (9).
대표청구항▼
What is claimed is: 1. A hydrostatic drive system for a mobile machine, comprising: a travel drive; and working hydraulics, the working hydraulics including a variable delivery pump operatively connected to a driving engine, wherein the delivery pump is connected to a container on an inlet side and
What is claimed is: 1. A hydrostatic drive system for a mobile machine, comprising: a travel drive; and working hydraulics, the working hydraulics including a variable delivery pump operatively connected to a driving engine, wherein the delivery pump is connected to a container on an inlet side and delivers to a delivery line, to which at least one consumer of the working hydraulics is connected, wherein the consumer is controllable by a control valve device having a closed neutral position, wherein the pump is adjustable in a direction of a higher delivery to generate a braking action in a braking or overrun condition of the travel drive and wherein pressure medium delivered by the pump is feedable to a pressure valve, wherein the pressure valve is arranged in the delivery line led from the delivery pump to the control valve device, and wherein a container branch line, which is connected to a container and in which a circulating device is arranged, is connected to the delivery line downstream of the pressure valve. 2. The hydrostatic drive system according to claim 1, wherein the pressure valve is a proportionally adjustable pressure valve proportionally adjustable by an electrical actuating device. 3. The hydrostatic drive system according to claim 2, wherein the actuating device of the pressure valve is a proportional magnet. 4. The hydrostatic drive system according to claim 2, wherein the pressure valve can be urged in a direction of an increase of a setting pressure by means of the actuating device. 5. The hydrostatic drive system according to claim 1, wherein the pressure valve is controllable in dependence on a rotational speed of the driving engine in a braking or overrun condition. 6. The hydrostatic drive system according to claim 1, wherein the circulating device has a blocking position and a throughflow position, the circulating device being able to be urged from the blocking position in the direction of the throughflow position to discharge the pressure medium delivered in excess by the pump. 7. The hydrostatic drive system according to claim 6, wherein the circulating device is a pressure balance which can be urged by a delivery pressure present in the delivery line downstream of the pressure valve in the direction of the throughflow position and can be urged by a spring and by the delivery pressure present in the delivery line in the direction of the blocking position, the urging of the pressure balance in the direction of the blocking position being able to be switched over from the delivery pressure to the load pressure, present in a load pressure-indicating line of the working hydraulics, of the consumer of the working hydraulics in order to discharge the pressure medium delivered in excess by the pump. 8. The hydrostatic drive system according to claim 7, wherein the circulating device is controllable by a switching valve device. 9. The hydrostatic drive system according to claim 8, wherein the switching valve device has a first switching position in which a control surface, acting in the direction of the blocking position, of the circulating device is connected to the delivery line of the pump upstream of the pressure valve, and a second switching position in which the control surface, acting in the direction of the blocking position, of the circulating device is connected to the load pressure-indicating line of the working hydraulics. 10. The hydrostatic drive system according to claim 9, wherein the switching valve device can be urged into the second switching position in order to generate a braking action in a braking or overrun condition or discharge the pressure medium delivered in excess by the pump. 11. The hydrostatic drive system according to claim 8, including an adjusting apparatus which controls the delivery of the pump and can be urged in the direction of an increase of the delivery by means of the switching valve device in order to generate the braking action. 12. The hydrostatic drive system according to claim 11, wherein the adjusting apparatus of the pump includes an adjusting cylinder device with a spring acting in a direction of maximum delivery and a control pressure space acting in a direction of minimum delivery, the loading of which space is controllable by a demand flow-regulating valve having a first switching position which acts in the direction of an increase of the delivery of the pump and in which the control pressure space is connected to the container, and a second switching position which acts in the direction of a reduction of the delivery of the pump and in which the control pressure space is connected to the delivery line of the pump, the demand flow-regulating valve being able to be urged in the direction of the first switching position by a spring and the pressure present in a load pressure-indicating line and in the direction of the second switching position by the delivery pressure present in the delivery line of the pump, the load pressure-indicating line led to the demand flow-regulating valve being connectable to the delivery line of the pump by means of the switching valve device in order to increase the delivery of the pump. 13. The hydrostatic drive system according to claim 12, including a selecting device configured as a shuffle valve device and arranged in the load pressure-indicating line, which selecting device is connected on an outlet side to that section of the load pressure-indicating line which is led to the demand flow-regulating valve, and of which a first inlet is connected to that section of the load pressure-indicating line which is connected to the consumers of the working hydraulics and a second inlet is connected to the outlet of the switching valve device. 14. The hydrostatic drive system according to claim 8, wherein the switching valve device is a switch-over valve which in a first switching position connects a control surface, acting in the direction of the blocking position, of the circulating device to the delivery line of the pump, and in a second switching position connects the control surface, acting in the direction of the blocking position, of the circulating device to the load pressure-indicating line of the working hydraulics, and also connects the delivery line to that section of the load pressure-indicating line which is led to the pump. 15. The hydrostatic drive system according to claim 14, wherein the switch-over valve is controllable by means of an electrical actuating device including a switching magnet. 16. The hydrostatic drive system according to claim 15, wherein the switch-over valve can be urged by means of a spring in the direction of a first switching position and by means of the actuating device in the direction of the second switching position. 17. The hydrostatic drive system according to claim 8, wherein the switching valve device has a first switching valve which in a first switching position connects a control surface, acting in the direction of the blocking position, of the circulating device to the delivery line of the pump, and in a second switching position connects the control surface, acting in the direction of the blocking position, of the circulating device to the load pressure-indicating line of the working hydraulics, and has a second switching valve which in a first switching position closes off the connection of the delivery line to that section of the load pressure-indicating line which is led to the pump, and in a second switching position connects the delivery line to that section of the load pressure-indicating line which is led to the pump. 18. The hydrostatic drive system according to claim 17, wherein the first valve can be urged into the second switching position in order to discharge the pressure medium delivered in excess by the pump. 19. The hydrostatic drive system according to claim 17, wherein at least one of the first switching valve and the second switching valve is controllable by means of an electrical actuating device including a switching magnet. 20. The hydrostatic drive system according to claim 19, wherein at least one of the first switching valve and the second switching valve can be urged by means of a spring in the direction of the first switching position and by means of the actuating device in the direction of the second switching position. 21. The hydrostatic drive system according to claim 12, wherein the pump is provided for controlling a hydraulic steering device, a priority valve being arranged in the delivery line upstream of the pressure valve in order to supply the steering device. 22. The hydrostatic drive system according to claim 21, including a selecting valve configured as a shuffle valve and arranged in a load pressure-indicating line downstream of a selecting device, of which valve the outlet is connected to that section of the load pressure-indicating line which is led to the demand flow-regulating valve, the first inlet is connected to that section of the load pressure-indicating line which is connected to the outlet of the selecting device and the second inlet is connected to a load pressure-indicating line of the steering device. 23. The hydrostatic drive system according to claim 8, wherein at least one of the circulating device, the pressure valve, and the switching valve device are arranged in a control valve block of the working hydraulics.
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