• 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:NL2003815A
    申请号:NL2003815
    申请日:2009-11-17
    公开日:2010-05-18
    发明作者:Andreas Gadermayr
    申请人:Poettinger Ohg Alois；
    IPC主号:
    专利说明:

    Short description: Agricultural machine.
    The present invention relates to an agricultural machine for attachment to a tractor, preferably in the form of a mowing machine or a turning machine, with at least one working unit, at least one lifting cylinder for lifting the working unit in an headland and / or transport position , and a relief cylinder to relieve the weight of the working unit in the working position.
    An agricultural machine of the aforementioned type is known, for example, from DE 10 2006 002 066 A1. It on a mounting resp. supporting frame height-adjustable working unit can be lifted from the lowered working position to a headland position and / or to a transport position by means of a lifting cylinder. In order to achieve a weight relief in the lowered working position in which the working unit is guided over the ground, a relief cylinder has an influence on the working unit, which relief cylinder is loaded with an adjustable relief pressure. The relieving force produced as a result, which counteracts the weight of the working unit, allows the working unit to follow better soil contours and to float lightly over soil unevenness, without the work unit being buried in the ground due to its considerable own weight.
    Such relief cylinders, however, sometimes give rise when the working unit is raised to the headland or headland. transport position problems. If - depending on the working conditions - the relief pressure, which is usually applied by means of a pressure tank, is set to a relatively low value, then when the working unit is raised, the relief cylinder will yield and the machine will no longer be lifted completely. resp. is collapsed. Such a problem can arise, for example, when machining oblique surfaces. In such situations, the relief pressure must be manually raised and later lowered again for the working position. If, on the other hand, the relief pressure is set to a sufficiently high value, in order to at least raise or raise completely. to ensure that the machine collapses, the relief in the working position is often too large, so that, for example, when driving quickly over a subsidence, a sufficiently fast lowering of the working unit is no longer guaranteed.
    Starting from this, the object of the invention is to provide an improved agricultural machine of the above-mentioned type which avoids the disadvantages of the prior art and advantageously implements the latter. Preferably with simple means a fully raised or lowered position is required. The machine must be collapsed without having to pay for losses in the optimum position in the working position.
    According to the invention, this object is achieved by an agricultural machine according to claim 1. Preferred embodiments of the invention are the subject of the dependent claims.
    It is therefore proposed to automatically increase the relief pressure when the machine is being raised, without the need for complex pressure control on the tractor. The extra pressure for the relief cylinder is derived from the lifting movement of the working unit, so that no additional pressure control lines from the tractor are required. According to the invention, a lifting pressure side of the lifting cylinder, which is pressurized when lifting the working unit, can be connected via a pressure transfer device to a relief pressure side of the relief cylinder. This principle is based on the consideration that the pressure of the lifting pressure cylinder when lifting the machine relative to the working position clearly increases, so that this pressure increase can be used to produce a sufficient pressure increase in the relief cylinder to raise the relief cylinder in the lifting cylinder. to move its tensioned end position, which is desired when lifting the machine. Depending on the installation situation of the release cylinder, it is, due to the additional pressure derived from the lifting pressure of the lifting cylinder, into the fully retracted resp. fully extended position, which - depending on the installation situation - corresponds to the maximum relief.
    The pressure transfer device for producing the additional pressure in the relief cylinder when lifting the machine can in principle be designed in various ways and be adapted to the shape of the relief circuit. If, for example, compressible media, such as gas, are used in the relief circuit, an additional amount of gas can be pressed into the relief circuit. If on the other hand an at least approximately compressible pressure medium is used, such as for example hydraulic oil, which is loaded by a pressure actuator, such as a spring piston or a pressure membrane accumulator, the volume of the pressure circuit filled with the compressible pressure medium can also be reduced in order to to achieve pressure increase.
    In a favorable further embodiment of the invention, the pressure transfer device has a volume control device which controls a volume change produced in the pressure circuit of the relief cylinder when the operating unit is raised, in particular such that a volume change of predetermined magnitude is produced.
    The volume control device can in this case, in principle, be designed in different ways, for example control a corresponding change in volume via valves. In a preferred embodiment of the invention, however, the pressure transfer device comprises a control cylinder with at least two pressure chambers, one pressure chamber of which can be connected to the lifting pressure side of the lifting cylinder and the other pressure chamber to the relief pressure side of the relief cylinder. This control cylinder converts a pressure change occurring in the lifting cylinder into a change in volume of the relief circuit and thereby into a pressure change in said relief circuit. The lifting pressure created in the lifting cylinder is therefore not directly released into the pressure circuit of the release cylinder, for example such that hydraulic fluid is simply pressed out of the lifting cylinder circuit into the release cylinder circuit, but is converted into an adjusting movement of the piston of the control cylinder, which then effecting a change in volume in the relief circuit.
    The lifting cylinder and the unloading cylinder furthermore advantageously comprise two separate pressure medium circuits which are separated from one another in such a way that the pressure medium of one circuit does not come into contact with or mix with the pressure medium of the other circuit. However, the two pressure medium circuits are connected to each other via the said adjusting cylinder, so that the lifting pressure created in the lifting cylinder is transferred to the discharge circuit and produces an additional pressure therein.
    By using the control cylinder mentioned, the production of the extra pressure in the relief circuit can be variably adjusted both with regard to the height of the pressure produced and with regard to the change in volume. For example, due to cross-sectional areas of different sizes of the two aforementioned pressure chambers of the control cylinder, a greater pressure change in the lift cylinder can be converted into a smaller increase in the additional pressure in the relief cylinder or vice versa. According to a favorable further embodiment of the invention, however, the control cylinder can comprise two pressure chambers with corresponding cross-sectional surfaces.
    The relief cylinder can in principle be designed in different ways and be loaded in different ways with a relief pressure. In a preferred embodiment of the invention, the relief cylinder is loaded with an at least approximately compressible pressure medium, wherein a pressure tank for supplying the relief pressure is advantageously provided. Said pressure tank can operate by means of a mechanical spring, but can advantageously also comprise a gas pressure spring. Advantageously, an adjustment device for adjusting the relief pressure is added to the relief cylinder.
    The relief cylinder and the lifting cylinder can in principle be mounted on the agricultural machine in different ways, for example parallel to each other between the working unit and a mounting or fixing device. supporting frame are fitted. In a particularly favorable further embodiment of the invention, the lifting cylinder and the relief cylinder are connected in series one after the other, wherein in particular the lifting cylinder and the relief cylinder can be connected by a common piston rod.
    The invention is explained in more detail below with reference to preferred embodiments and accompanying drawings. Show in the drawings:
    Fig. 1: a schematic perspective view of a mowing machine to be attached to a tractor, which can be lifted and lowered by means of a pivotable carrying arm,
    Fig. 2: a partial perspective view of the carrying arm for lifting the mowing machine and of the lifting cylinder and release cylinder mounted on the carrying arm, which are coupled to each other by a steering cylinder, and
    Fig. 3: a longitudinal section of the steering cylinder from Fig. 2.
    The agricultural machine in the form of a mowing machine shown in Fig. 1 comprises a support stand 1 which can be attached to the tractor (not shown) via a per se usual three-point coupling 2. The support frame 1 carries a lifting device with a lateral lifting arm 3, which is pivotally coupled to the support frame 1 about a pivotal axis 4 pointing in the direction of travel. Subsequently, the actual working unit 5 in the form of a mowing machine is attached to said lifting arm 3, which working unit can have rotating cutting drums in a manner known per se.
    The lifting arm 3 can be raised and lowered by means of a lifting cylinder 6 around the pivot axis 4, for example to be moved to a headland position or to a transport position. Furthermore, a relief cylinder 7 is hingedly attached to the lifting arm 3, by means of which the lifting arm 3 and thereby the hinged working unit 5 can be relieved of weight when the working unit 5 is in the lowered working position guided over the ground.
    As shown in Figures 1 and 2, the lifting cylinder 6 and the relief cylinder 7 are arranged behind each other, the lifting cylinder 6 and the relief cylinder 7 sharing a common piston rod 8, which in each of the cylinders 6 and 7 inwards and outwards can also be pushed out again. The two cylinders 6 and 7 are arranged so-called chain-like behind each other and receive opposite ends of the piston rod 8. The lifting cylinder 6 and the relief cylinder 7 can in each case be designed as a single-acting cylinder. It is sufficient if each of the cylinders 6 and 7 has only a single pressure chamber, which is between the end of the piston rod 8 and the respective edge of the cylinder 6 and 7, respectively. 7, from which the piston rod 8 emerges, is provided so that the piston rod 8 can be pushed in there under pressure load of the cylinder in question in order to raise or lower the lifting arm 3 and therefore the working unit 5. to relieve the weight thereof.
    As Fig. 2 shows, the lifting cylinder 6 can be loaded with lifting pressure by means of a pressure line 9, for example from the tractor, to lift the working unit 5 to the headland and / or transport position.
    On the other hand, the relief cylinder 7 is loaded from a pressure tank 10 with a relief pressure. The pressure tank 10 can advantageously have a pressure adjustment device 11 for adjusting the relief pressure, wherein said pressure adjustment device 11 can for instance comprise a filling / relief valve, via which valve a gas pressure chamber forming a spring device is filled or filled. can be relieved.
    As shown in FIG. 2, a pressure transfer device 13 is provided between the lifting pressure chamber 12 of the lifting cylinder 6 and the relief pressure chamber of the relief cylinder 7, which pressure or pressure generated in the lifting cylinder. transfers a pressure change occurring there during lifting in the form of an additional pressure to the relief cylinder 7.
    Said pressure transfer device 13 herein advantageously comprises a control cylinder 14, which comprises two pressure chambers 16 and 17 separated by a displaceable piston 15, one of which is connected to the lifting pressure side of the lifting cylinder 6 and the other to the relief pressure side of the relief cylinder 7. In the embodiment shown, the two pressure chambers 16 and 17 are in this case on the pressure lines 18 or 9 connected to the lifting cylinder 6 from the tractor resp. in each case, pressurize the relief cylinder 7 from the pressure tank 10.
    As a result, the following function occurs: When the lifting arm 3, and thereby the working unit 5, have been lowered into the working position guided over the ground, the lifting cylinder 6 is essentially pressureless, so that it is fully extended. As a result, there is no pressure from the one pressure chamber 16 of the control cylinder 14, so that the control cylinder 14 has been pushed by the pressure coming from the relief circuit into the end position shown in Fig. 3. To that end, in the relief circuit, the relief pressure provided via the pressure tank 10 provided for operation is provided, which relieves a weight relief of the operating unit 5 via the relief cylinder 7. The relief cylinder 7 can slide in and out depending on the bottom contour, the relief pressure abutting in the relief cylinder 7 absorbing part of the weight of the working unit.
    On the other hand, the working unit 5 is moved via the lifting cylinder 6 to the headland resp. transport position, a corresponding pressure is exerted on the lifting cylinder 6 via the pressure line 18 from the tractor. This pressure is also exerted on the control cylinder 14, more precisely, on the pressure chamber 16 thereof, so that the piston 15 of the control cylinder 14 is pressed to the right from the position shown in FIG. The lifting pressure for lifting the working unit 5 is regularly clearly greater than the relief pressure set in the pressure tank 10, so that the said movement of the piston 15 is produced. Again, as a result of this, a pressure increase, more precisely, a change in volume and, as a result thereof, a pressure change is produced in the relief circuit, which ensures that the relief cylinder 7 is also fully retracted. By shifting the piston 15 of the control cylinder 14, pressure medium is said to be forced into the relief circuit, as a result of which the relief cylinder 7 is forced into its retracted position. This ensures that the machine is actually collapsed when the working aggregate 5 is raised.
    权利要求:
    Claims (8)
    [1]
    An agricultural machine for attachment to a tractor, preferably in the form of a mowing machine or a turning machine and the like, with a working unit (5), at least one lifting cylinder (6) for lifting the working unit (5) to a headland. and / or transport position, and a relief cylinder (7) for relieving the weight of the working unit (5) in the working position, characterized in that a lifting pressure side of the lifting cylinder (6), which when lifting the working unit (5) is pressurized, can be connected via a pressure transfer device (13) to a relief pressure side of the relief cylinder (7).
    [2]
    Agricultural machine according to the preceding claim, wherein the pressure transfer device (13) comprises a volume control device (20) for controlling a volume change produced in the pressure circuit of the relief cylinder (7) when the working unit (5) is lifted.
    [3]
    Agricultural machine according to one of the preceding claims, wherein the pressure transfer device (13) comprises a control cylinder (14) with at least two pressure chambers (16, 17), one pressure chamber (16) of which with the lifting pressure side of the lifting cylinder (6) and the other pressure chamber (17) can be connected to the relief pressure side of the relief cylinder (7).
    [4]
    Agricultural machine according to the preceding claim, wherein the cross-sectional areas of both pressure chambers (16, 17) correspond in size to each other.
    [5]
    Agricultural machine according to one of the preceding claims, wherein the lifting cylinder (6) and the relief cylinder (7) are connected in series, preferably connected to each other by a common piston rod (8).
    [6]
    Agricultural machine according to one of the preceding claims, wherein the lifting cylinder (6) and the relief cylinder (7) comprise two separate pressure medium circuits which are coupled to each other by means of the pressure transfer device (13).
    [7]
    Agricultural machine according to one of the preceding claims, in which the relief cylinder (7) is loaded from a pressure tank (10) with a relief pressure.
    [8]
    Agricultural machine according to the preceding claim, wherein the pressure tank (10) comprises a pressure adjustment device (11) for adjusting the relief pressure.
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    同族专利:
    公开号 | 公开日
    DK178281B1|2015-11-02|
    DE102008057716A1|2010-05-20|
    FR2938401A1|2010-05-21|
    NL2003815C2|2010-09-22|
    DK200901184A|2010-05-18|
    DE102008057716B4|2019-09-26|
    FR2938401B1|2014-09-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1131992A1|2000-03-10|2001-09-12|Maschinenfabrik Bernard Krone GmbH|Mowing machine|
    DE202005008807U1|2005-06-06|2006-10-12|Alois Pöttinger Maschinenfabrik Gmbh|Agricultural machine for joining to a grinding gear comprises hydraulic cylinders joined together by a common piston rod|
    NL1035029C2|2008-02-15|2009-08-18|Lely Patent Nv|Agricultural machinery e.g. mower, for use with tractor to cut crops, has two lift cylinders formed over hinge of agricultural tool, and valve adding fluid to one of cylinders when pressure in other cylinder is less than threshold pressure|
    FR2785143B1|1998-10-30|2001-02-16|Kuhn Sa|AGRICULTURAL MACHINE COMPRISING A DOUBLE CYLINDER WITH A SINGLE CYLINDER|
    FR2857559B1|2003-07-18|2006-08-18|Kuhn Sa|AGRICULTURAL MOWER COMPRISING AN IMPROVED DEVICE FOR THE POSITIONING OF MANEUVER|
    DE102006002066B4|2005-06-06|2017-01-26|Alois Pöttinger Maschinenfabrik Gmbh|agricultural machinery|
    DE102005062033A1|2005-12-23|2007-07-05|Claas Saulgau Gmbh|mower|DE202010011803U1|2010-08-25|2011-12-05|Alois Pöttinger Maschinenfabrik Gmbh|agricultural machinery|
    DE102017102114A1|2017-02-03|2018-08-09|Amazonen-Werke H. Dreyer Gmbh & Co. Kg|Hydraulic actuator for an agricultural tillage machine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102008057716.2A|DE102008057716B4|2008-11-17|2008-11-17|agricultural machinery|
    DE102008057716|2008-11-17|
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