• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL2005587A
    申请号:NL2005587
    申请日:2010-10-27
    公开日:2011-05-02
    发明作者:Thomas Weissenback；Markus Sandberger；Karl Edlbauer
    申请人:Alois Poettinger Maschinenfabrik Gmbh；
    IPC主号:
    专利说明:

    Attachment for an agricultural machine.
    The present invention relates to an attachment machine for an agricultural machine, preferably in the form of a loading, pressing and / or harvesting wagon, comprising a drawbar for attachment to a tractor and an undercarriage for supporting against the ground, comprising at least one axle with steerable wheels, as well as a steering device for steering said wheels, depending on the angle of the drawbar, wherein the steering device comprises at least one steering axle cylinder for turning in said wheels, as well as a coupling cylinder for providing a control pressure, depending on the angle of the drawbar and / or of the attachment with respect to the tractor, wherein said coupling cylinder is coupled via coupling means to the drawbar and / or can be activated depending on the angle of the drawbar.
    For agricultural machine attachments of the above-mentioned type, it is advantageous for various reasons to steer at least one of the axles of the chassis depending on the bend of the drawbar relative to the tractor, for example, when driving through sharp bends, to bend excessively. to counteract the drawbar and to weaken the "cutting of bends" of the rear-mounted attachment, or to prevent or weaken a dynamic imbalance when driving through sharper turns with multi-axle attachments.
    For example, loading wagons are known in which the drawbar is rigidly attached to the machine frame, respectively. it is only possible to bend about a horizontal transverse axis, but is not steerable about an upright axis, the machine frame of larger models often being supported against the ground by a multi-axis undercarriage. To improve the behavior when cornering, it has already been proposed to use one of the two axes, resp. the wheels fitted thereto can be steered, resp. to be rotatable so that the wheels of the different axes are aligned approximately tangentially to the circular arcs. A two-axle undercarriage of such an already known loading wagon is shown, for example, in Fig. 4. A forced steering is provided for the wheels of the rear axle which turns the wheels accordingly, respectively. in a ratio of the bend of the drawbar to the tractor. For screwing in the wheels 6 of the steerable axle 8 of the chassis 4, steering axle cylinders 10 are arranged which are operated by a coupling cylinder 11. The coupling cylinder 11 is coupled to the hinge connection of the loading wagon 1 at the tractor 12 with a distance of the drawbar coupling shaft 13 from the drawbar 9 and the tractor 12, resp. arranged such that when the drawbar 9 is bent over with respect to the tractor 12, the coupling cylinder 11 is extended or retracted when cornering. The volume changes, respectively, which occur in the pressure chambers of the coupling cylinder 11. pressure changes are transmitted to the above-mentioned steering axle cylinders 10, so that the wheels 6 of the steerable axle 8 turn in accordance with the deflection of the drawbar 9.
    However, such hydraulic devices with a forced steering are disadvantageous in several respects. Particularly with slow cornering, high steering forces per se are required to turn in the steerable wheels. If small curves are driven during this, a larger steering angle, resp. large adjustment paths of the steering axle cylinders 10 must be required, so that the coupling cylinder 11 which actuates the steering axle cylinders 10 should displace a correspondingly large amount of pressure medium and provide a sufficiently large pressure, which requires a corresponding diameter of the pressure chamber of the coupling cylinder 10 . However, this would result in very large coupling forces on the coupling cylinder 11, which would exceed the maximum permitted coupling force between the tractor and the attachment, which can usually amount to 20 tonnes. On the other hand, if the diameter of the coupling cylinder is reduced in order not to cause too great coupling forces, the displaced quantity of oil is too small to turn the steerable wheels of the attachment sufficiently far to be able to drive small cornering radius.
    Starting from this, it is an object of the present invention to provide an improved attachment for agricultural machinery of the above-mentioned nature, which avoids disadvantages of the prior art and further develops the latter advantageously. In particular, an improved steering device must be provided for the steerable wheels of the attachment, which, without exceeding the permissible coupling force between the tractor and the attachment, provide sufficiently large steering forces and an angle of impact for driving through sharp turns when driving slowly.
    According to the invention this object is achieved by an agricultural machine attachment according to claim 1. Preferred embodiments of the invention are the subject of the subclaims.
    It is therefore proposed that the at least one steering axle cylinder for turning the wheels no longer directly resp. not only by actuating the displaced volume of the torque cylinder, but by steering the steering axle cylinder through an additional controllable pressure source with the necessary control pressure and the necessary amount of pressure medium to ensure the necessary steering impact even at low travel speeds and without excessive pressure. to achieve the torque cylinder. The pressure of the coupling cylinder generated during the bending of the drawbar is used here as control pressure, by means of which additional switching on of the control pressure source is controlled. The steerable wheels of the attachment are, as it were, only operated indirectly only by the clutch cylinder or the cylinder. the actuation of the at least one control axle cylinder is supported by a control pressure source that is separate, respectively. is independent of the torque cylinder, which is controlled by the control pressure of the torque cylinder. According to the invention, the at least one control axle cylinder can be pressurized from said control pressure source via a control valve, which valve can be actuated by the control pressure of the coupling cylinder. Via the aforementioned control valve, a separate control pressure is transmitted to the steering axle cylinder which causes the wheels to turn in, which pressure is not resp. not only comes from the torque cylinder, but also from a separate control pressure source. There is the possibility here of not only utilizing the pressure of the coupling cylinder that arises during the bending of the drawbar for controlling the said control valve, but also transferring it to the steering axle cylinder which causes the turning of the wheels to support individual control pressure from the control pressure source. Advantageously, however, the at least one control axle cylinder is pressurized exclusively from the control pressure source, while the coupling cylinder only serves to control said control valve, via which the load of the control shaft cylinder is controlled from said control pressure accumulator.
    By using a separate control pressure source, very high pressure values can be generated in the control axle cylinders in order to be able to provide high control forces even at low travel speeds. At the same time, the forces in the torque cylinder remain low, so that no high torque forces arise between tractors and attachments.
    In a further development of the invention, a hydraulic system on the tractor side is advantageously used as a control pressure source. Alternatively or additionally, a control pressure source provided on the attachment could also be used, for example a pump on the attachment that is driven electrically or mechanically via a PTO shaft. Advantageously, however, the control device has a pressure connection for coupling to the hydraulic system on the tractor side, which is used as a control pressure source. As a result, sufficiently high pressure values can be provided very efficiently.
    The control valve, via which the control pressure is transferred from the control pressure source to the at least one control shaft cylinder, can in principle be of different design. In an advantageous further development of the invention, the valve comprises a switch valve unit which, depending on its position, transfers the supply pressure of the control pressure source to a pressure circuit for a left-hand impact or a pressure circuit for a right-hand impact for the at least one control shaft cylinder. Depending on the position in which the switch valve unit is brought about by the pressure of the coupling cylinder, the control pressure is transferred from the control pressure source to a line, resp. a channel for a left-hand impact, or a pipe, resp. a channel for a weft to the right. For example, the switch valve unit may be in the form of a multi-way valve, preferably in the form of a four / three-way valve, the two output connections of which can each be connected to the above-mentioned pressure circuit for an impact to the left and the pressure circuit for an impact to the right, while the two input-side connections of the multi-way valve can be connected to the control pressure source or the return line, depending on the switching position. the return tank.
    Optionally, in a further development of the invention, the aforementioned control valve can also fulfill a pressure control function which also controls the pressure coming from the control pressure source as regards height, for example only partially transmits it to the control axle cylinders and / or controls variably as regards height . However, to achieve a simple embodiment, only a multi-way valve is sufficient.
    The at least one steering axle cylinder can be designed differently in a further development of the invention. In order to enable turning both to the right and to the left, the steering axle cylinder is advantageously designed to be double acting, whereby a first pressure chamber of the steering axle cylinder can be connected to said pressure circuit for an impact to the left and a second pressure chamber to said pressure circuit for an impact to the right. Depending on the embodiment of the wheel suspension, only one steering axle cylinder can be used, for example when a centrally rotatably suspended steering axle is used. In a further development of the invention, however, two steering axle cylinders can also belong to a steerable axle, around a right-hand wheel, respectively. be able to steer a left wheel by means of a separate steering axle cylinder. Instead of a double-acting cylinder designed in the above-mentioned manner, two single-acting cylinders could in principle also be used, one of which is responsible for the impact to the right and the other for the impact to the left.
    The coupling cylinder associated with the drawbar can in principle also be of different design, wherein the coupling cylinder in a further development of the invention is of double-acting design and has two pressure chambers which are coupled to opposite control chambers of the control valve, so that, depending on the deflection of the drawbar pressure is applied to one or the other side of the control valve.
    The torque cylinder is advantageously arranged and / or converted in such a way that it undergoes a change in length with respect to the tractor which corresponds to the bend of the drawbar of the attachment. For example, the coupling cylinder can be hinged to the drawbar on the one hand and hinged to the tractor on the other at a distance from the drawbar coupling shaft.
    In an alternative further development of the invention, it can also be provided for, that the coupling cylinder accommodates a bending of the drawbar relative to a machine frame of the attachment tool, respectively. is actuated depending on the extent that the attachment has such a bendable drawbar, which may, for example, be the case with a multi-axle chassis, in which a shaft is connected to the drawbar. In this case, the angle of impact of the drawbar relative to the machine frame and the triggering of the coupling cylinder thereby effected could be used to control a further shaft not connected to the drawbar. However, the above-described embodiment is preferred in the sense that the coupling cylinder is coupled on the one hand to the drawbar and on the other hand to the trigger to be actuated by bending the drawbar relative to the trigger.
    Around the steering system resp. not to overload the steering axle cylinder thereof with steering pressure from the separate steering pressure source, it is provided in an advantageous further development of the invention that the control pressure provided by the coupling cylinder is reduced if the steerable wheels have already taken the correct wheel impact. The reduced control pressure of the coupling cylinder leads to a corresponding displacement of the control valve and thereby to a reduction of the pressure transmitted from the control pressure source to the control axle cylinder of the steerable wheels. A control of the steering impact can hereby be achieved which corresponds to the displacement of the coupling cylinder. For example, if the torque cylinder is only slightly displaced when making slight bends, the control pressure of the torque cylinder thereby generated is reduced as soon as the wheels have reached a correspondingly small steering stroke. As a result of the reduction of the control pressure, the control pressure is reduced, so that the wheels remain at their small impact. On the other hand, if a sharp turn is made and the torque cylinder is strongly displaced, the control pressure is only reduced with a correspondingly stronger steering stroke of the steerable wheels of the attachment.
    The pressure control device provided for this purpose for reducing the control pressure of the coupling cylinder can in principle be of a different nature. According to an advantageous embodiment of the invention, the pressure control device can comprise a synchronous cylinder, to which the coupling cylinder is coupled, respectively. fluid-connected, which is coupled to the steerable wheels of the steerable axle of the chassis and / or is moved accordingly by turning the said wheels, and so advantageously that the control pressure of the coupling cylinder is turned on by turning the wheels of the Steerable axle of the attachment is accordingly reduced, resp. proportional to the position of the torque cylinder.
    To this end, in a further development of the invention, the synchronizing cylinder can be of double-acting design and have two pressure chambers which are coupled to one of the pressure chambers of the coupling cylinder. Advantageously, the cross-sectional areas of the pressure chambers of the synchronous cylinders are in proportion to the cross-sectional areas of the pressure chambers of the connecting cylinder connected thereto, which corresponds approximately to the ratio of the maximum bending of the drawbar applied to the maximum predetermined weft of the steerable wheels. Coupling the pressure chambers of the synchronous cylinder with the pressure chambers of the coupling cylinder controls the pressure generated by the coupling cylinder by bending the drawbar, depending on the changed impact of the steerable wheels and, in particular, being reduced when the predetermined position of the wheel impact has been reached. Optionally, however, the control pressure of the clutch cylinder is also increased if, for whatever reasons, the desired wheel impact is not changed.
    Via the synchronous cylinder, the control pressure of the torque cylinder can also be used to support the steering stroke.
    To prevent uncontrolled forward and reverse steering of the steerable axle of the attachment in the event of an unforeseen pressure reduction in the steering system system, for example if the hydraulic pressure of the tractor fails, in a further development of the invention a blocking device for the control device are provided when the operating pressure of the control device drops below a predetermined value. The blocking device can be realized in various ways. According to an advantageous embodiment of the invention, a shut-off valve can be arranged between the control valve and the at least one control axle valve, which shut-off valve can be actuated by a pressure on the output side of the control valve and / or the control pressure of the coupling valve and and / or the pressure from the control pressure source, advantageously so that the control device is blocked with a reduction of one or more of the stated pressure values. In particular, the said shut-off valve can block the above-mentioned pressure circuit for an impact to the left and the pressure circuit for an impact to the right. The connection between the control valve and the aforementioned pressure circuits for an impact to the left, resp. an impact to the right is only switched on if there is sufficient operating pressure.
    Alternatively or additionally, in a further development of the invention, the control device may comprise a reset device for resetting the steerable wheels to the zero position thereof, ie position in which they run straight ahead, which can advantageously also be activated by a pressure reduction in the normal operation of the steering system. For example, said reset circuit may comprise a separate pressure accumulator, as well as an associated switch valve which switches on the pressure of said individual pressure accumulator by means of a pressure reduction. Said switching valve can here be controlled by different pressure values, for example by the pressure of the pressure accumulator for the control upstream of the control valve.
    In a further development of the invention, the reset device can herein comprise a separate reset actuator, for example in the form of a reset cylinder. When the above-mentioned switch valve of the reset device switches on the pressure from the pressure accumulator, it is transferred to the reset cylinder about the wheels in the zero position, respectively. rotate to the straight-ahead position.
    Alternatively or additionally, the said switching valve can be coupled to the pressure circuits for a left-handed or resp. an impact to the right and / or with the at least one steering axle cylinder, so that with a pressure reduction in a normal operating system the steerable wheels can be adjusted centrally.
    The invention is explained in more detail below with reference to the preferred exemplary embodiments and the accompanying drawings. In the drawings: Fig. 1 shows a schematic side view of an implement for an agricultural vehicle in the form of a loading wagon according to an advantageous embodiment of the invention, which has a biaxial chassis and is hingedly connected to a tractor via a rigid drawbar, 2: a schematic representation of the hydraulic steering device for steering the wheels of the rear axle of the chassis of the loading wagon of the preceding FIG. 1, the components of the steering device being shown in the manner of a circuit diagram, FIG. 3: a schematic representation of a steering device according to a further advantageous embodiment of the invention similar to FIG. 2, wherein a blocking device is arranged in the hydraulic circuits of the steering device for locking the steerable wheels in the event of a pressure reduction of the system, FIG. 4: a schematic representation of a steering device for the loading wagon of FIG further advantageous embodiment of the invention in an image corresponding to fig. 2, wherein the steering device comprises a return device for resetting the steerable wheels in the straight-ahead position thereof, fig. 5: a schematic view of a control device for the loading wagon of fig. 1 according to a further advantageous embodiment of the invention in an illustration similar to fig. 2, wherein the steering device in an embodiment corresponding to fig. 4 has a reset device for resetting the steerable wheels in the straight-ahead position thereof, however, until the embodiment according to Fig. 4 a separate reset cylinder is not used for the reset, but the steering axle cylinders for steering the wheels, Fig. 6: a schematic representation of a hydraulic forced steering for a loading wagon according to Fig. 1 according to a known embodiment , which does not represent an embodiment of the present invention.
    The loading wagon 1 shown in Fig. 1 comprises, in a manner known per se, a machine frame 2, which carries a storage space 3 for harvested goods and is supported against the ground by means of a chassis 4.
    A drawbar 9 is rigidly attached to the machine frame 2 and can be pivotally coupled to the tractor 12 about an upright drawbar shaft 13 in order to pull the loading wagon 1 with the tractor 2.
    The above-mentioned storage space 3 for harvested goods is loaded in a manner known per se by means of a pick-up device 14, which comprises, for example, a pick-up installation 15, with harvested goods which are picked up from the bottom.
    In the embodiment shown, the chassis 4 of the loading wagon 1 comprises two axles 7 and 8, the wheels 6 of the rear axle 8 being steerable.
    In the ninety. 2, two steering axle cylinders 10 are provided for screwing in the aforementioned rear wheels 6 of the steerable rear axle 8, said steering cylinders being pivotally connected on the one hand to a coupling rod of the steerable wheel and on the other hand being supported against a fixed with the axle, respectively . component connected to the chassis. The wheels 6 mentioned are moved out respectively. retracting the mentioned steering axle cylinders 10 to the left, resp. turned right.
    In the embodiment shown, the two steering axle cylinders 10 are designed to be double-acting, so that each steering axle cylinder 10 can effect both the impact to the left and the impact to the right. The pressure chambers of the steering axle cylinders 10 are on the one hand connected to a pressure circuit 17 for an impact to the left, respectively. on the other hand, with a pressure circuit 18 for an impact to the right. Depending on which of the pressure chambers of the steering axle cylinders 10 is loaded with pressure, the wheels 6 are moved to the right, respectively. turned to the left.
    The control pressure for actuating the steering axle cylinders 10 is in this case provided by the tractor 12, the hydraulic system of which serves as control pressure source 19. As Fig. 2 shows, the loading wagon 2 has a control pressure connection 20 which is connected can be with the hydraulic system of the tractor 12.
    The control pressure from the control pressure source 19 is then controlled via a control valve 21 and optionally transferred to the aforementioned pressure circuit 17 for a left-hand impact or the pressure circuit 18 for a right-hand impact 18. In the embodiment shown in Fig. 2, the control valve is 21 is designed as a four / three-way valve, of which input-side connections with the said control pressure connection 20 and thereby with the control pressure source 19 and on the other hand with a return or resp. the tank 22 are connected. The output side connections of said control valve 21 are connected to the aforementioned pressure circuit 17 for an impact to the left and the pressure circuit 18 for an impact to the right, compare fig. 2. Depending on the position of the control valve 21, the control pressure is released from the control pressure source 19 closed, resp. separated from both pressure circuits 17 and 18, with the control valve 21 in this position the two pressure circuits 17 and 18 with each other, respectively. to the tank 22. In its two other positions, said control valve 21 connects the control pressure source 19 either to the left-hand pressure circuit 17 or to the right-hand pressure circuit 18. The printing circuit 17, respectively not connected to the control pressure source 19, respectively. 18 is connected to the tank 22.
    Said control valve 21 is actuated by a coupling cylinder 11 which is arranged in the region of the hinge connection of the drawbar 9 to the trigger 12 and which is activated by bending the drawbar 9 relative to the trigger 12. As fig. 2, said coupling cylinder 11 can be hingedly connected to the drawbar 9 at a distance from the coupling shaft 13 of the drawbar and on the other hand be hingedly connected to the tractor 12, so that it is slid to the right during bends and is turned to the left during bends to the left retracted.
    Said steering axle cylinder 10 is in this case designed in the shown embodiment according to Fig. 2 to be double-acting, wherein the two pressure chambers of the coupling cylinder 11 are connected to opposite operating chambers of the control valve 21, so that the control valve 21 when sliding in and out of the coupling cylinder 11 with a corresponding bend according to Fig. 2 is moved to the right and left to selectively transfer the control pressure from the control pressure source 19 to the pressure circuit 17 for an impact to the left or to the left. the pressure circuit 18 for an impact to the right. The control pressure of the torque cylinder 1 resp. the pressure medium volume displaced by this cylinder is thus used for operating the control valve 21, via which the pressure load of the control shaft cylinder 10 is controlled from the control pressure source 19.
    In the embodiment shown, a synchronous cylinder 23 is furthermore arranged, which is coupled to the steerable shaft 8, resp. the steerable wheels 6 of this axle 8, so that the synchronous cylinder 23 is moved in accordance with the steering impact of the wheels 6, i.e. is pushed in and out. The pressure chambers of said synchronizing cylinder 23 are hereby attached to the pressure chambers of the coupling cylinder 11, so that the control pressure of the coupling cylinder 11 decreases as soon as the wheels 6 have been turned in correspondingly far, so that the volume displaced by the coupling cylinder 11 is compensated by a corresponding adjustment movement of the synchronous cylinder 23.
    As shown in FIG. 2, both the synchronous cylinder 23 and the coupling cylinder 11 each have equally large pressure chambers, which is achieved by a piston rod that runs through the entire cylinder body. The pressure chambers of the synchronizing cylinder 23 do not necessarily have to be of the same size as the pressure chambers of the coupling cylinder 11. Advantageously, they are selected relative to each other such that the volume displacement of the coupling cylinder 11 corresponds to a maximum bending of the drawbar 9 with the volume displacement of the synchronous cylinder 23 with a maximally applied steering angle.
    Furthermore, as Fig. 2 shows, a valve 24 is connected between the two strands of the pressure lines attached for adjusting the zero position, which either closes or releases the connection between the two sides of the coupling cylinder 11, said valve 24 for adjusting the zero position depending on the pressure provided by the control pressure source 19 can be controlled, preferably such that the two sides of the coupling cylinder 11 are closed relative to each other as soon as the control pressure is supplied from the control pressure source 19.
    The embodiment of Fig. 3 substantially corresponds to the embodiment of Fig. 2, so that reference is made to the description thereof. In addition, in the embodiment according to Fig. 3, a shut-off valve 25 is connected in one of the pressure circuits 17 and 18 for a weft to the left and a weft to the right, which corresponds to the corresponding pressure circuit 17, respectively. 18 shuts down or switches on, depending on a normal operating pressure, resp. of a pressure reduction thereof. With a pressure reduction in the supply line to the control valve 21 and / or with a pressure reduction of the control pressure for operating the control valve 21, the said shut-off valve 25 closes the control device 26, so that the control shaft remains in the last rotated position and no uncontrolled rotation of the shaft 8 can take place.
    The embodiment shown in fig. 4 also corresponds in principle to the embodiment according to fig. 2, so that here too reference is made to the above description. In addition, the control device 26 has a reset device 27 which, in the event of an unexpected pressure reduction in the normal operating system, switches the wheels 6 back to their straight-ahead position, respectively. in their zero position. As shown in FIG. 4, the reset device 27 may comprise a separate reset pressure accumulator 28 which can be switched on or off by means of a switch valve 29. In the engaged position, the pressure is transferred from the reset pressure accumulator 28 to a reset cylinder 30 which is suitably connected to the rear axle 8, resp. the steerable wheels 6 of this axle 8 for rotating the wheels 6 in the straight-ahead position under a pressure load.
    Said switching valve 29 can here be pressure-controlled, wherein the control pressure on the upstream side of the control valve 21 can be used as control pressure, for example; however, if it decreases, the switch valve 29 changes to its engaged position to straighten the wheels.
    The embodiment shown in Fig. 5 corresponds in principle to the embodiment of Figs. 2 to 4, so that reference is made to the description thereof. However, compared to the embodiment according to Fig. 4, the reset device 27 is of a different design. In particular, no individual, separate reset cylinder 30 is used. Instead, the pressure supplied from the reset pressure accumulator 28 is transferred via a switch valve 29 to the pressure circuit 17 for a left-hand impact or the pressure circuit 18 for a right-hand impact or closed in a neutral position of said switch valve 29. In In the embodiment shown, the switch valve 29 is in this case designed as a four-three-way valve to enable the pressure circuit of one pressure circuit 17 or 18 to connect the respective other circuit to the return tank.
    In addition, shut-off valves 25 are connected in the pressure circuits 17 and 18 for a left-handed and a right-handed weft between the control axle cylinders 10 and the control valve 21, which valves block the connection from the control axle cylinder 10 to the control valve 21 in the above-mentioned manner.
    The switching valve 29 is actuated by a charging circuit for the accumulator, the activation of the signal from an angle sensor 31 advantageously taking into account the rotation of the wheels in the correct direction.
    In an advantageous embodiment of the invention, the steering axle cylinders, the coupling cylinder and the synchronous cylinder are designed in a manner known per se as piston-pressure cylinder units, wherein a corresponding displacement of the pressure means takes place or is effected by means of a piston displacement. a piston shift takes place due to a pressure medium load. Alternatively, the steering axle cylinders, optionally also the coupling cylinder, can also be designed in the form of other pressure actuators, for example in the form of hydromotors such as, for example, rotary motors. However, the said embodiment is preferred in the form of piston-pressure cylinder units.
    权利要求:
    Claims (12)
    [1]
    An implement for an agricultural machine, preferably in the form of a loading and / or pressing, and / or harvesting wagon, with a drawbar (9) for attaching to a tractor (12), a chassis (4) for support against the bottom, comprising at least one axle (8) with steerable wheels (6), and a steering device (26) for steering said wheels (6) depending on the angle of the drawbar (6), the steering device (26) comprises at least one steering axle cylinder (10) for screwing in said wheels (6), as well as a coupling cylinder (11) for providing a control pressure which is coupled via coupling means to the drawbar (9) and / or depending of the angle of the drawbar (9) and / or of the attachment tool relative to the tractor can be actuated, characterized in that the at least one steering axle cylinder (10) can be pressurized from a control pressure source (19) via a control valve (21), which can be activated by the control pressure of the coupling cylinder der (11).
    [2]
    Agricultural machine attachment tool according to the preceding claims, wherein the control pressure source (19) comprises a hydraulic system on the tractor side.
    [3]
    Agricultural machine attachment tool according to one of the preceding claims, wherein the control valve (21) comprises a switch valve unit which, depending on its position, transmits the input-side control pressure of the control pressure source (19) to a pressure circuit (17) for a left or left impact a pressure circuit (18) for an impact to the right for the at least one steering axle cylinder (10).
    [4]
    Agricultural machine attachment tool according to one of the preceding claims, wherein the at least one steering axle cylinder (10) is designed to be double-acting, and comprises a first pressure chamber connected to the pressure circuit (17) for a left-hand impact and a second pressure chamber comprises connected to the pressure circuit (18) for a right-hand impact.
    [5]
    Agricultural machine attachment tool according to one of the preceding claims, wherein the coupling cylinder (11) is designed to be double acting and comprises two pressure chambers which are coupled to opposite control chambers of the control valve (21).
    [6]
    An attachment machine for an agricultural machine as claimed in any one of the preceding claims, wherein the coupling cylinder (11) is disconnected from the pressure circuit of the at least one steering axle cylinder (10).
    [7]
    Agricultural machine attachment tool according to one of the preceding claims, wherein a pressure control device (32) is provided for reducing the control pressure of the coupling cylinder (11) depending on a wheel impact of said wheels (6).
    [8]
    Agricultural machine attachment tool according to the preceding claim, wherein the pressure control device (32) comprises a synchronous cylinder (23) which is fluidly connected to the coupling cylinder (11), which synchronous cylinder (23) is coupled to the steerable wheels (6) and / or is rotatable by turning the wheels (6) in such a way that the control pressure of the coupling cylinder (11) with turning the said wheels (6) accordingly, or proportionally to the position of the coupling cylinder (11) becomes less.
    [9]
    An agricultural machine attachment tool according to the preceding claim, wherein the synchronizing cylinder (23) has a double-acting design and has two pressure chambers which are each coupled to one of the pressure chambers of the coupling cylinder (11), the cross-sectional areas of the pressure chambers of the synchronizing cylinder (23) are in a proportion to the cross-sectional areas of the pressure chambers of the coupling cylinder (11), which roughly corresponds to the ratio of the maximum applied bend of the drawbar (9) to the maximum determined steering angle of the wheels (6).
    [10]
    An attachment machine for an agricultural machine according to any one of the preceding claims, wherein between the control valve (21) and the at least one control shaft cylinder (10) a shut-off valve (25) is arranged, which can be actuated by an outlet side against the control valve ( 21) adjacent pressure and / or by the control pressure of the coupling cylinder (11) and / or by the pressure of the control pressure source (19), such that the control device (26) is blocked with a pressure reduction of one or more of the mentioned pressure values.
    [11]
    An agricultural machine attachment tool according to any one of the preceding claims, wherein the steering device (26) comprises a return device (27) for returning the wheels (6) to the straight-ahead position, the return device (27) having a separate reset accumulator ( 28), as well as an associated switch valve (29) which switches on the pressure of the reset accumulator (28) in the event of a pressure reduction from the control pressure source (19).
    [12]
    An implement for an agricultural machine as claimed in any one of the preceding claims, wherein a shut-off valve (24) is arranged between the pressure chambers of the coupling cylinder (11) which either closes or switches on a connection of the two pressure chambers of the coupling cylinder and depending on the control pressure of the control pressure source (19) can be activated, in particular such that the connection is switched on in the event of a pressure reduction of the control pressure source (19).
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    NL2005587C2|2012-03-20|
    DE202009014617U1|2011-03-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE202009014617|2009-10-29|
    DE202009014617U|DE202009014617U1|2009-10-29|2009-10-29|Agricultural implement|
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