Agricultural work machine and method for operating an agricultural work machine

Abstract

Agricultural work machine, comprising at least one first blower (30) for pneumatically actuating one or more conveying lines and / or for pneumatically operating one or more working units, wherein the first blower (30) can be driven by means of a hydraulic first drive unit (31), a hydraulic system (1) for hydraulically actuating and / or operating the first drive unit (31); and at least one displacement unit (40) drivable by an external power source (41), which is provided at least for supporting hydraulic actuation and / or operation of the first drive unit (31), wherein the displacement unit (40) and the first drive unit (31) can be connected to one another via at least one hydraulic first drive line (42A, 42B).In order to further improve the hydraulic efficiency of previous agricultural working machines, it is provided that at least one second drive line (60) designed in the manner of a hydraulic residual flow line branches off along the first drive line (42A, 42B), via which second drive line at least one further hydraulic drive unit (71) of at least one further fan (70) can be connected to the displacement unit (40).

Description

[0001] The invention relates to an agricultural working machine according to the preamble of patent claim 1 and a method for operating an agricultural working machine according to the preamble of patent claim 10.

[0002] Agricultural machinery comes in various designs and is used for a wide variety of agricultural purposes. These include, for example, distribution machines for spreading material on agricultural land, such as seed drills for sowing seeds or spreaders for distributing fertilizer, etc.

[0003] Such machines are often equipped with at least one blower for pneumatically pressurizing conveyor lines and / or for pneumatically operating one or more work units. Such blowers are typically driven by at least one hydraulic drive unit, which in turn is actuated and / or operated by an associated hydraulic system.

[0004] Due to the relatively high drive power required by such hydraulic drive units for the blowers, the use of additional displacement units, particularly designed as boost pumps, has proven successful in agricultural practice. These displacement units are often driven by an external power source, such as a tractor PTO drive. Such displacement units are connected, in particular in a fluid-conducting manner, to the respective drive unit of the blower via at least one hydraulic first drive line and are intended to at least support the hydraulic actuation and / or operation of the drive unit. Such an agricultural work machine with an additional displacement unit, particularly designed as a boost pump, is described, for example, in the document DE 10 2020 128 996 A1.

[0005] However, the systems or working machines known from the prior art have the disadvantage that a residual flow branching off between the drive unit of the blower and the displacement unit is returned and / or circulated at least almost unused and the previous systems are therefore not sufficiently satisfactory in terms of efficiency.

[0006] The object underlying the invention is therefore to eliminate the described disadvantages of the prior art. In particular, the object is to further improve the hydraulic efficiency of existing agricultural machines.

[0007] This object is achieved according to the invention in that at least one second drive line, designed in the manner of a hydraulic residual flow line, branches off along the first drive line, via which at least one further hydraulic drive unit of at least one further blower can be connected to the displacement unit.

[0008] As a result of this measure, an agricultural work machine is created in which the actual residual flow line of the displacement unit, preferably designed as a boost pump, can be used to at least support the actuation and / or operation of at least one further drive unit. The displacement unit is thus preferably configured to drive the at least one further drive unit via the at least one second drive line, in particular branching off from the first drive line.

[0009] The term "residual flow line" or "residual flow" refers in particular to a hydraulic line or a volume flow of a hydraulic fluid through which an excess portion of a hydraulic fluid can be diverted and / or discharged from a preferably pressure-controlled and / or pressure-regulated drive line. In other words, such a residual flow line preferably serves to at least partially discharge hydraulic fluid not required for the operation of a first drive unit.

[0010] The agricultural working machine according to the invention thus has the decisive advantage that the energy and / or hydraulic fluid not used for the first drive unit and / or the first fan can be used to actuate and / or operate at least one further drive unit and the hydraulic efficiency of the agricultural working machine is therefore significantly increased.

[0011] The term "hydraulic drive unit" or "drive unit" preferably refers to a hydraulically driven motor or hydraulic motor or a hydraulically driven pump or hydraulic pump, which is particularly preferably configured to drive a working unit and / or a fan of the agricultural work machine. Particularly preferably, the drive unit is connected, on the one hand, in a fluid-conducting manner to the hydraulic system and, on the other hand, mechanically, for example, via at least one drive shaft, to the respective fan to be driven. Furthermore, the drive unit preferably serves to convert hydraulic energy into mechanical energy.

[0012] In a preferred embodiment of the work machine according to the invention, the displacement unit is designed to influence and / or generate a volume flow of a supplyable hydraulic fluid, wherein the volume flow along the first drive line can be divided into a first partial volume flow that can be supplied to the first drive unit and a second partial volume flow that can be supplied to the further drive unit. It is preferably provided that the second partial volume flow results at least partially from the remainder and / or from the portion of the volume flow that can be supplied via the displacement unit that is surplus or unused for the first drive unit. The first partial volume flow can preferably be adjusted in a controlled and / or regulated manner from the volume flow of the hydraulic fluid resulting via the displacement unit.In particular, the volume flow of the hydraulic fluid is throttled downstream of the displacement unit and / or along the first drive line toward the first drive unit. Furthermore, the second partial volume flow is preferably branched and / or diverted into the second drive line in the manner of an excess residual flow, which results at least partially from the volume flow conveyed via the displacement unit and the first partial volume flow. Such an embodiment is advantageous in that a residual flow of hydraulic fluid not required for the first drive unit can be used to actuate and / or operate further / other drive units and / or consumers.

[0013] In a further development of the work machine according to the invention, at least one first switching and / or regulating valve, in particular a flow control valve or throttle valve, is arranged along the first drive line, by means of which the first drive line and the second drive line can be or are connected to one another. The switching and / or regulating valve, which is preferably designed in the manner of a flow control valve or throttle valve, is particularly preferably arranged downstream of the displacement unit and upstream of the first drive unit. Furthermore, the switching and / or regulating valve preferably has, in addition to a first fluid outlet provided for the first drive unit, at least one further and / or second fluid outlet for the at least one further and / or second drive unit.Furthermore, it is preferably provided that the second drive line branches off from the switching and / or control valve and thus from the first drive line via the second fluid outlet. Alternatively or additionally, the second fluid outlet can be arranged directly upstream of the first fluid outlet and / or directly upstream of the switching and / or control valve in the flow and / or conveying direction of the hydraulic fluid. Such an embodiment allows for a particularly simple and efficient design of the hydraulic system for operating multiple hydraulic drive units.

[0014] In another preferred embodiment of the work machine according to the invention, the first partial volume flow can be adjusted by means of the first switching and / or control valve, in particular the flow control valve or throttle valve. The first switching and / or control valve is preferably designed such that the second partial volume flow can be fed in a branching manner from the first switching and / or control valve to the further displacement unit. The switching and / or control valve is preferably configured to influence, in particular to control and / or regulate, the volume flow of hydraulic fluid that can be influenced and / or conveyed via the displacement unit to the first drive unit. The switching and / or control valve is particularly preferably designed in the manner of an adjustable flow control valve or throttle valve.

[0015] In another development of the work machine according to the invention, at least one hydraulic pressure supply device is assigned to the hydraulic system, which is intended to provide and / or supply the hydraulic fluid with at least one basic pressure level and / or at least one basic drive volume flow. The first and / or further drive unit can be actuated and / or operated at least partially or at least in a supporting manner with the basic pressure level and / or basic drive volume flow. Preferably, it is provided that the displacement unit is configured to increase the basic pressure level and / or the basic drive volume flow at least in sections within the hydraulic system, in particular for the first and / or second drive unit.

[0016] Furthermore, the pressure supply device is preferably assigned to a tractor that can be coupled to the agricultural work machine. The hydraulic system can preferably be coupled in a fluid-conducting manner via one or more hydraulic coupling devices to the pressure supply device, which is preferably arranged on the tractor. Alternatively or additionally, the pressure supply device and / or at least one further pressure supply device can be arranged on the agricultural work machine. The pressure supply device is preferably configured to introduce and / or supply the hydraulic fluid at an adjustable pressure and / or volume flow, in particular at the base pressure level and / or base drive volume flow, into the hydraulic system assigned to the agricultural work machine.The pressure supply device preferably comprises one or more switchable hydraulic control devices, in particular tractor control devices, one or more hydraulic conveying devices, for example in the manner of a hydraulic pump, and / or one or more hydraulic tanks.

[0017] In a further preferred embodiment of the work machine according to the invention, the hydraulic system comprises at least one main drive line that is connectable or connected to the pressure supply device and via which the base pressure level and / or the base drive volume flow can be supplied to the first and / or further drive unit, wherein the first and / or second drive line opens into the at least one main drive line and / or is connectable to the at least one main drive line. Particularly preferably, the hydraulic system comprises at least one first main drive line, which is assigned to the first drive unit, and at least one second main drive line, which is assigned to the at least one further and / or second drive unit.The pressure supply device is preferably designed to supply and / or convey the hydraulic fluid at an adjustable pressure and / or volume flow, in particular at the base pressure level and / or base drive volume flow, via the respective main drive line to the respective drive units. In particular, it is provided that the respective drive units can be actuated and / or operated both with the base pressure level and / or base drive volume flow supplied via the respective main drive line and with the volume flow of hydraulic fluid conveyable via the at least one displacement unit, preferably designed as a boost pump. With such an embodiment, the hydraulic drive power within the agricultural work machine is significantly increased in a simple manner.

[0018] In a further development of the work machine according to the invention, the displacement unit is designed in the manner of an adjustment drive, preferably a variable displacement motor or a variable displacement pump, with an adjustable displacement volume. The displacement unit in the manner of an adjustment drive is preferably understood to be a hydraulically operated motor (variable displacement motor) or a hydraulically operated pump (variable displacement pump) with an adjustable and / or adaptable displacement volume. Such a displacement unit can, for example, be designed in the manner of an axial piston pump or a radial piston motor. The term "displacement volume" here preferably refers to the volume or quantity of hydraulic fluid that the displacement unit displaces or requires per revolution. The displacement volume can be adapted, for example, via an adjusting disk or an adjusting ring within the displacement unit.Thus, the hydraulic efficiency of such a design of the agricultural working machine is further improved.

[0019] Furthermore, a work machine according to the invention is preferred in which at least one control device in the manner of an LS controller is assigned to the displacement unit, wherein the control device can be connected to the first and / or further drive unit, preferably on the input side to the first and / or further drive unit, via at least one upstream check valve or shuttle valve. The shuttle valve can alternatively also be referred to as a changeover valve. The hydraulic control device is designed in particular to adjust the displacement unit, preferably designed as an adjustment drive and / or boost pump, depending on the requirements, in particular the input pressures, of the respective drive unit.Preferably, the control device is fluidly connectable to the first drive line and / or first main drive line of the first drive unit and / or to the second drive line and / or second main drive line of the second drive unit. In other words, it is preferably provided that the control device is and / or can be subjected to the input pressures of the hydraulic fluid of the first and / or second drive unit. Thus, the displacement unit can be adjusted particularly efficiently to the requirements and / or required drive power of the drive units and thus of the blowers.

[0020] In another preferred embodiment of the work machine according to the invention, at least one control and / or regulating unit is arranged between the displacement unit and the further drive unit, preferably along the second drive line and / or downstream of the first switching and / or regulating valve, in which the introducible second partial volume flow can be discharged at least partially only via a first outlet to the further drive unit and / or a second outlet, which is preferably preceded by a pressure relief valve, to a hydraulic tank. Particularly preferably, the control and / or regulating unit is arranged between the switching and / or regulating valve, preferably designed as a flow control valve or throttle valve, and the second drive unit.Furthermore, the excess residual flow of hydraulic fluid not required by the second drive unit can preferably be returned to the hydraulic tank via the second outlet of the control and / or regulating unit. In particular, the pressure level of the second partial volume flow within the second drive line can be adjustable by means of the pressure relief valve, which is particularly preferably arranged directly upstream of the second outlet of the control and / or regulating unit. Alternatively or additionally, at least one further or third outlet can be provided on the control and / or regulating unit, which is fluidly connected to the flow control valve or throttle valve of the control and / or regulating unit and via which the excess residual flow of hydraulic fluid not required by the second drive unit can be returned to the hydraulic tank.Such an embodiment has the advantage that the drive power of the additional drive unit or the additional fan can also be adjusted.

[0021] The object underlying the invention is also achieved with a method for operating an agricultural working machine according to the type mentioned above, in particular according to the features of patent claim 10. With regard to the advantages and modifications of the method according to the invention, reference is first made to the advantages and modifications of the agricultural working machine according to the invention.

[0022] According to the invention, at least one second drive line, designed in the manner of a hydraulic residual flow line, branches off along the first drive line, via which at least one further hydraulic drive unit of at least one further blower can be connected to the displacement unit. The further drive unit is hydraulically operated at least partially and / or at least in a supporting manner via the displacement unit.

[0023] Further details of the invention can be found in the example description and the drawings. The drawings show Fig. 1 shows a first embodiment of a hydraulic circuit diagram of an agricultural working machine according to the invention; and Fig. 2 a second embodiment of a hydraulic circuit diagram of an agricultural working machine according to the invention.

[0024] In the Fig. 1 shows a first embodiment of a schematically indicated hydraulic circuit diagram of a hydraulic system 1, which is provided for an agricultural working machine (not shown).

[0025] The working machine can be designed in the manner of a distribution machine, such as a seed drill or a spreader.

[0026] The illustrated hydraulic system 1 comprises, among other things, a pressure supply device 10, which here, by way of example, is assigned to a tractor that can be coupled to the work machine and is also not shown in the figure. Alternatively or additionally, the pressure supply device 10 can also be assigned to the work machine and / or arranged on the work machine. The pressure supply device 10 has a hydraulic pump 11 and a plurality of hydraulic control units 12A-12D, also referred to as tractor control units. Furthermore, the pressure supply device 10 has a reservoir for a hydraulic fluid, referred to as a hydraulic tank 13. The pressure supply device 10 is designed, in particular by means of a plurality of connecting couplings 14A, 14B assigned to a coupling device, to be connected in a fluid-conducting manner to a hydraulic part 20 of the hydraulic system 1 assigned to the work machine.Furthermore, the pressure supply device 10 is designed to provide and / or deliver the hydraulic fluid with a corresponding basic pressure level and / or basic drive volume flow VG1, VG2 for the agricultural work machine.

[0027] As can also be seen, the agricultural work machine comprises a first blower 30 for pneumatically actuating one or more conveying lines (not shown here) and / or for pneumatically operating one or more working units (also not shown here). Furthermore, the first blower 30 can alternatively or additionally be provided for conveying material to be spread, such as seed and / or fertilizer. The first blower 30 is designed to be drivable by means of a hydraulic first drive unit 31. The drive unit 31 is designed in particular in the manner of a hydraulic motor and / or a hydraulic pump and is connected to the first blower 30 in a mechanical or force-transmitting manner, in particular via a drive shaft 310.

[0028] As can also be seen, the first drive unit 31 is connected to the pressure supply device 10 via a first hydraulic main drive line 32 and can be actuated and / or operated hydraulically by means of the supplied hydraulic fluid within the hydraulic system 1.

[0029] Furthermore, at least one displacement unit 40, which can be driven by an external power source 41 and is designed in particular as a boost pump, is arranged within the hydraulic system 1. The external power source 41 is designed in the manner of a power take-off drive and, for example, has at least one drive shaft 410 and a motor drive 411. The motor drive 411 can be arranged on the tractor or on the work machine. Furthermore, the displacement unit 40 can be connected to the first drive unit 31, in particular the first main drive line 32, via at least one hydraulic first drive line 42A, 42B. By means of such an arrangement, the displacement unit 40 is configured to at least assist the hydraulic actuation and / or the hydraulic operation of the first drive unit 31 and / or to at least partially drive the first drive unit 31.In particular, the displacement unit 40 is provided to increase the basic pressure level provided by the pressure supply device 10 and / or the basic drive volume flow VG1, VG2.

[0030] Furthermore, in this exemplary embodiment, the displacement unit 40 can be connected downstream and in a fluid-conducting manner to the pressure supply device 10 and / or the hydraulic tank 13 via an optionally provided residual flow line 50 and a first pressure relief valve 51 and / or first check valve 52.

[0031] According to the invention, at least one second drive line 60, designed in the manner of a hydraulic residual flow line, branches off along the first drive line 42A, 42B, via which second drive line at least one further hydraulic drive unit 71 of at least one further blower 70 can be connected to the displacement unit 40.

[0032] Here, it is provided that the displacement unit 40 is configured to influence and / or generate a volume flow V of a hydraulic fluid that can be supplied, in particular via the pressure supply device 10. The volume flow V can then be further divided along the first drive line 42A, 42B into a first partial volume flow V1 that can be supplied to the first drive unit 31 and a second partial volume flow V2 that can be supplied to the further drive unit 71. In particular, for this purpose, at least one first switching and / or regulating valve 53, designed here as an adjustable flow control valve, is arranged along the first drive line 41A, 42B, by means of which the first drive line 41A, 42B and the second drive line 60 can be connected or are connected to one another. Alternatively or additionally, the switching and / or regulating valve 53 can be designed in the manner of a throttle valve or the like.The first switching and / or control valve 53 is configured to adjust and / or reduce the volume flow V at least to a first partial volume flow V1. Furthermore, the first switching and / or control valve 53 is configured to divert the second partial volume flow V2 from the first drive line 42A, 42B as a residual volume flow, which is dependent on the volume flow V and the adjustable first partial volume flow V1, to the further displacement unit 71.

[0033] The second partial volume flow V2, which is discharged in the manner of a residual volume flow, is to be understood or interpreted here in particular in such a way that it is not returned unused to the hydraulic tank 13, but instead is used as surplus from the first switching and / or control valve 53 for further use and / or for driving the further drive unit 71.

[0034] Furthermore, the figure shows that the first drive line 42A, 42B and / or the first partial volume flow V1 opens into and / or can be fed into the first main drive line 32 and / or to a first basic pressure level and / or basic drive volume flow VG1, which is pressurized in the first main drive line 32 and provided by the pressure supply device 10. It can also be seen that the second drive line 60 and / or the second partial volume flow V2 opens into and / or can be fed into a second main drive line 62 and / or to a second basic pressure level and / or basic drive volume flow VG2, which is pressurized in the second main drive line 32 and provided by the pressure supply device 10. Depending on the design, the first and second basic pressure levels and / or the first and second basic drive volume flows VG1, VG2 can be the same or different from one another.

[0035] In other words, this achieves that the first and / or further drive unit 31, 71 can be actuated and / or operated, on the one hand, at least partially with the respective basic pressure level and / or basic drive volume flow VG1, VG2 of the pressure supply device 10 and, on the other hand, at least in a supporting manner by means of the displacement unit 40 designed as a boost pump.

[0036] Furthermore, in this exemplary embodiment, at least one control and / or regulating unit 63 designed as a hydraulic assembly is optionally arranged between the displacement unit 40 and the further drive unit 71, in particular along the second drive line 60 and / or downstream of the first switching and / or regulating valve 53. The control and / or regulating unit 63 is configured to adjust and / or limit at least the second partial volume flow V2 that can be supplied to the further drive unit 71. For this purpose, the control and / or regulating unit 63 comprises at least one second switching and / or regulating valve 64 in the manner of a flow control valve or alternatively in the manner of a throttle valve. The second partial volume flow V2 can be supplied to the second drive unit 71 in an adaptable manner via the second switching and / or regulating valve 64 and a first output 64A.The second partial volume flow V2 can further be diverted at least partially in the manner of a further residual volume flow via at least one second pressure relief valve 65 and a second outlet 66A and / or via the switching and / or control valve 64 and a third outlet 66B to the hydraulic tank 13. In particular, it is provided that the switching and / or control valve 64 is designed in the manner of a 3-way flow control valve.

[0037] In the Fig. Figure 2 shows a second embodiment of a schematically illustrated hydraulic circuit diagram for an agricultural machine. For the sake of simplicity and brevity, only the differences of the otherwise identical structure compared to the first embodiment are described below. Fig. 1 described.

[0038] The first difference is simply that the displacement unit 40 is designed in the manner of an adjustable drive, in particular a variable displacement motor or a variable displacement pump, with an adjustable or variable displacement volume. In other words, a boost pump in the manner of a variable displacement motor or a variable displacement pump with an adjustable displacement volume is used. The displacement unit 40 is further connected to the motor drive 411 via a gear and / or coupling device 412 and a drive shaft 410.

[0039] In this exemplary embodiment, at least one control device 42 in the form of an LS (load sensing) controller is assigned to the displacement unit 40 for the needs-based adjustment and / or regulation of the displacement volume. The control device 42 is further fluidically connected to the first and further drive units 31, 71 via a respective check valve 421, 422 and a respective hydraulic line 421A, 422A assigned to the control device 42. The first hydraulic line 421A branches off on the inlet side, i.e., directly upstream, in front of the first drive unit 31. A first check valve 421 with a release position facing the control device 42 is arranged along the first hydraulic line 421A. The second hydraulic line 422A branches off on the inlet side, i.e., directly upstream, in front of the second drive unit 71.A second check valve 422 is arranged along the second hydraulic line 422A with a release position facing the control device 42. The first and second hydraulic lines 421A, 422A open into a common third hydraulic line 423, which is fluidly connected to the control device 42. With such an arrangement, the control device 42 is acted upon and / or controlled by the input pressures present at the respective drive units 31, 71, whereby the displacement volume of the displacement unit 40 can be and / or is adjusted, in particular automatically.

[0040] Alternatively, it would also be conceivable for the control device 42 to be connected to only one of the multiple drive units 31, 71. Furthermore, it would also be conceivable for the displacement unit 40 to be used without a control device, and for the displacement volume to be adjustable, in particular, manually by an operator. It would also be conceivable for at least one shuttle valve or switching valve to be arranged along at least one of the hydraulic lines 421A, 422A or instead of at least one of the check valves 421, 422.

[0041] A further difference in the second exemplary embodiment can be seen in the area of the hydraulic control and / or regulating unit 63. The second partial volume flow V2 that can be introduced into the control and / or regulating unit 63 can be discharged to the hydraulic tank 13 either only via a first outlet 64A to the further drive unit 71 or alternatively or additionally via a second outlet 66A, which in particular is preceded by a pressure relief valve 65. For the sake of simplicity, the at least partial discharge of the second partial volume flow V2 via at least one further and / or third outlet 66B can be omitted in this exemplary embodiment. In particular, it is provided that the switching and / or regulating valve 64 is designed in the manner of a 2-way flow control valve.In other words, the hydraulic control and / or regulating unit 63 used in the first exemplary embodiment and designed as a 3-way flow regulator, in particular the 3-way switching and / or regulating valve 64, is replaced by a hydraulic control and / or regulating unit 63 designed as a 2-way flow regulator, in particular the 2-way switching and / or regulating valve 64. Alternatively, however, it would also be conceivable for the second partial volume flow V2 to be discharged from the control and / or regulating unit 63 in the manner of a further residual volume flow via at least three or more outputs in this / second exemplary embodiment.

[0042] It is understood that the features mentioned in the previously described embodiments are not limited to these specific combinations and are also possible in any other combinations. Furthermore, it is understood that the geometries shown in the figures are merely exemplary and are also possible in any other configurations. List of reference symbols 1 hydraulic system 10 Pressure supply device 11 Hydraulic pump 12A-12D Hydraulic control units 13 Hydraulic tank 14A, 14B connecting couplings 20 Part of the hydraulic system assigned to the working machine 30 First blower 31 First drive unit 310 drive shaft 32 First main drive line 40 Displacement unit 41 External power source 410 drive shaft 411 Motor drive 412 Gearbox and / or coupling device 42 Control device 42A, 42B First drive line 421 First check valve 421A First hydraulic line 422 Second check valve 422A Second hydraulic line 423 Third hydraulic line 50 residual power line 51 First pressure relief valve 52 First check valve 53 First switching and / or control valve 60 Second drive line 62 Second main drive line 63 Control and / or regulation unit 64 Second switching and / or control valve 64A First Exit 65 Second pressure relief valve 66A Second Exit 66B Third Exit 70 Additional fan 71 Additional drive unit V volume flow V1 First partial volume flow V2 Second partial volume flow VG1 First base pressure level and / or base drive flow rate VG2 Second basic pressure level and / or basic drive flow rate QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2020 128 996 A1

[0004]

Claims

[1] Agricultural working machine, preferably a distribution machine for spreading material on an agricultural area, comprising; - at least one first blower (30) for pneumatically actuating one or more conveying lines and / or for pneumatically operating one or more working units; wherein the first blower (30) is drivable by means of a hydraulic first drive unit (31), - a hydraulic system (1) for hydraulically actuating and / or operating the first drive unit (31); and - at least one displacement unit (40) drivable by an external power source (41), preferably designed as a boost pump, which is provided at least for supporting hydraulic actuation and / or operation of the first drive unit (31); wherein the displacement unit (40) and the first drive unit (31) are connectable to one another via at least one hydraulic first drive line (42A, 42B), characterized by that at least one second drive line (60) designed in the manner of a hydraulic residual flow line branches off along the first drive line (42A, 42B), via which at least one further hydraulic drive unit (71) of at least one further blower (70) can be connected to the displacement unit (40). [2] Working machine according to claim 1, characterized byin that the displacement unit (40) is designed to influence and / or generate a volume flow (V) of a supplyable hydraulic fluid, wherein the volume flow (V) along the first drive line (42A, 42B) can be divided into a first partial volume flow (V1) that can be supplied to the first drive unit (31) and a second partial volume flow (V2) that can be supplied to the further drive unit (71). [3] Working machine according to claim 2, characterized by that at least one first switching and / or control valve, in particular a flow control valve or throttle valve, is arranged along the first drive line (42A, 42B), by means of which the first drive line (42A, 42B) and the second drive line (60) can be or are connected to one another. [4] Working machine according to claim 3, characterized bythat the first partial volume flow (V1) is adaptable by means of the first switching and / or control valve, wherein the first switching and / or control valve is designed such that the second partial volume flow (V2) can be fed in a branching manner from the first switching and / or control valve as a residual volume flow, which is dependent on the volume flow (V) and adaptable first partial volume flow (V1), to the further displacement unit (40). [5] Working machine according to at least one of the preceding claims, characterized bythat the hydraulic system (1) is assigned at least one hydraulic pressure supply device (10), which is intended for providing and / or supplying the hydraulic fluid with at least one basic pressure level and / or at least one basic drive volume flow, wherein the first and / or further drive unit (31, 71) can be actuated and / or operated at least partially or at least in a supporting manner with the basic pressure level and / or basic drive volume flow. [6] Working machine according to claim 5, characterized byin that the hydraulic system (1) comprises at least one main drive line (32, 62) which is connectable or connected to the pressure supply device (10) and via which the basic pressure level and / or the basic drive volume flow can be supplied to the first and / or further drive unit (31, 71), wherein the first and / or second drive line (42A, 42B, 60) opens into the at least one main drive line (32, 62) and / or is connectable to the at least one main drive line (32, 62). [7] Working machine according to at least one of the preceding claims, characterized by that the displacement unit (40) is designed in the manner of an adjustment drive, preferably an adjustment motor or an adjustment pump, with an adjustable displacement volume. [8] Working machine according to claim 7, characterized bythat at least one control device (42) in the manner of an LS controller is assigned to the displacement unit (40), wherein the control device (42) can be connected to the first and / or further drive unit (31, 71) via at least one upstream check valve (421, 422) or shuttle valve, preferably on the input side to the first and / or further drive unit (31, 71). [9] Working machine according to at least one of the preceding claims 7 or 8, characterized bythat between the displacement unit (40) and the further drive unit (71), preferably along the second drive line (60) and / or downstream of the first switching and / or regulating valve, at least one control and / or regulating unit (63) is arranged, in which the introduceable second partial volume flow (V2) can be discharged at least partially only via a first outlet to the further drive unit (71) and / or a second outlet, which is preferably preceded by a pressure relief valve (65), to a hydraulic tank (13). [10] Method for operating an agricultural working machine, preferably according to at least one of the preceding claims, comprising; - at least one first blower (30) for pneumatically actuating one or more conveying lines and / or for pneumatically operating one or more working units; wherein the first blower (30) is drivable by means of a hydraulic first drive unit (31), - a hydraulic system (1) for hydraulically actuating and / or operating the first drive unit (31); and - at least one displacement unit (40) drivable by an external power source (41), preferably designed as a boost pump, which is provided at least for supporting hydraulic actuation and / or operation of the first drive unit (31); wherein the displacement unit (40) and the first drive unit (31) are connectable to one another via at least one hydraulic first drive line (42A, 42B), characterized bythat at least one second drive line (60) designed in the manner of a hydraulic residual flow line branches off along the first drive line (42A, 42B), via which second drive line at least one further hydraulic drive unit (71) of at least one further blower (70) can be connected to the displacement unit (40), wherein the further drive unit (71) is operated hydraulically at least partially and / or at least in a supporting manner via the displacement unit (40).

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