DE102017102114A1 - Hydraulic actuator for an agricultural tillage machine - Google Patents

Abstract

The invention relates to a hydraulic operating device for an agricultural tillage machine, with a plurality of working cylinders, the respective working piston within a pressure space between two end positions is movable back and forth, and a plurality of adjusting cylinders, by means of which one of the end positions of the working piston of a working cylinder is variable, wherein individual or all adjusting cylinders are connected in series.

Description

The invention relates to a hydraulic actuating device for an agricultural tillage machine according to the preamble of patent claim 1 and an agricultural tillage machine according to the preamble of patent claim 16.

Agricultural tillage machines use hydraulic actuators to set tillage tools. For example, in disc harrows, it is necessary to adjust the working height of the discs to the ground conditions and driving speed. So that the setting of the tillage tools does not have to be done manually, working cylinders are used, the working piston within a pressure space between two end positions are moved back and forth.

From the pamphlets DE 10 2004 025 522 A1 and EP 2 965 599 A1 Hydraulic actuators are known which find application for the adjustment of tillage tools.

Furthermore, hydraulic actuators are used to implement a hydraulic folding machine segments can. This is necessary, for example, in agricultural tillage machines whose working width exceeds a permissible road transport width, so that the machine width must be reduced before driving on a public road. The publication EP 1 616 471 A2 describes a corresponding system.

In addition, from the document EP 1 614 335 A2 an agricultural tillage machine is known in which a plurality of sets of tires are each coupled to hydraulic cylinders, wherein the hydraulic cylinders are interconnected to form a compensation system.

In various applications, the piston travel of several working cylinders, that is, the distance between the two end positions, between which the respective working piston is movable back and forth, must be limited simultaneously, for example, to align a variety of tillage tools identical. The limitation of the piston travel of several working cylinders requires in the prior art, however, a lot of time and / or a manual adjustment of each individual working cylinder.

The object underlying the invention is thus to accelerate and simplify the simultaneous limitation of the piston travel of several working pistons of a hydraulic actuator.

The object is achieved by an actuating device of the aforementioned type, wherein individual or all adjusting cylinders are connected in series.

The invention makes use of the knowledge that the actuation of the adjusting cylinder is coupled to each other by the series connection of adjusting cylinders, so that at the same time an end position of a plurality of working piston can be varied by the actuation of only one adjusting cylinder. This leads to a considerable simplification and acceleration in the simultaneous limitation of the piston travel of several working pistons. Preferably, a setting piston divides the pressure chamber of the adjusting cylinder into a first chamber and a second chamber, the volume of which change during a movement of the adjusting piston. In particular, the first chamber of the pressure chamber of the first of the series-connected adjusting cylinder is fluid-conductively connected to a liquid supply. In particular, in addition, the second chamber of the pressure chamber of the last of the series-connected adjusting cylinder is fluid-conductively connected to a liquid supply. The adjusting cylinders arranged between the first and the last of the adjusting cylinders connected in series are connected in such a way that in each case the second chamber of the pressure chamber of an adjusting cylinder is connected in a fluid-conducting manner to the first chamber of the pressure chamber of the next adjusting cylinder. Thus, the adjusting pistons of the series-connected adjusting cylinders are moved in a first direction, when hydraulic pressure is built up via the liquid supply, which is fluid-conductively connected to the first chamber of the pressure chamber of the first of the series-connected adjusting cylinder and moves in a second direction, when over the liquid supply, which is fluid-conductively connected to the second chamber of the pressure chamber of the last of the series-connected adjusting cylinder, hydraulic pressure is built up.

In addition, an actuating device according to the invention is advantageous in which individual or all working cylinders are connected in parallel. Preferably, the working piston divides the pressure chamber of the working cylinder into a first chamber and a second chamber, the volume of which change during a movement of the working piston. In particular, all the first chambers of the pressure chambers of the working cylinders connected in parallel are fluid-conductively connected to a common fluid supply. Thus, the parallel-connected working cylinders are actuated simultaneously and to the same extent when hydraulic pressure is built up via the fluid supply. Preferably, the liquid supply comprises a valve unit, wherein the valve unit is fluidly connected to a first supply line, which is adapted to be connected to a hydraulic system, for example to a hydraulic system of an agricultural tractor.

In addition, an actuating device according to the invention, which comprises a plurality of expansion cylinders, wherein in each case one working cylinder and one or more extension cylinders are connected in series, is particularly preferred. Preferably, the piston subdivides the pressure chamber of the expansion cylinders into a first chamber and a second chamber, the volume of which changes as the piston moves. In particular, the first chamber of the pressure chamber of the respective working cylinder is fluid-conductively connected to a liquid supply. In particular, in addition, the second chamber of the pressure chamber of the last of the working cylinder connected in series with the expansion cylinder is fluidly connected to a liquid supply. The second chamber of the pressure chamber of the working cylinder is fluid-conductively connected to the first chamber of the pressure chamber of the first extension cylinder. The expansion cylinders arranged between the first and the last of the expansion cylinders connected in series with the working cylinder are connected in such a way that the second chamber of the pressure chamber of an expansion cylinder is fluid-conductively connected to the first chamber of the pressure chamber of the next expansion cylinder. Thus, the working piston of the working cylinder and the pistons of the expansion cylinder connected in series with the working cylinder are moved in a first direction when hydraulic pressure is built up and moved in a second direction via the fluid supply, which is fluid-conductively connected to the first chamber of the pressure chamber of the working cylinder in that hydraulic pressure is built up via the liquid supply, which is fluid-conductively connected to the second chamber of the pressure chamber of the last of the expansion cylinders connected in series with the working cylinder. By the series connection of the extension cylinder, the actuator is arbitrarily expandable. One working cylinder in each case forms a master / slave circuit with an expansion cylinder.

In a further preferred embodiment of the actuating device according to the invention, the one or more extension cylinders, which are connected in series with a working cylinder, have a pressure space whose cross-sectional area substantially corresponds to the cross-sectional area of the pressure space of the working cylinder. Preferably, the volume of the pressure chamber of the one or more extension cylinders, which are connected in series with a working cylinder, the volume of the pressure chamber of the working cylinder. In particular, the Zylinderingfläche the pressure chamber of the one or more extension cylinders, which are connected in series with a working cylinder, the cylinder ring surface of the pressure chamber of the working cylinder.

In addition, an actuating device according to the invention is preferred, which has a first operating device, by means of which several or all working cylinders are simultaneously adjustable. Preferably, the first operating device comprises one or more operating elements, such as one or more switches and / or one or more push buttons. The first operating device may also have a display and / or a touchscreen. In particular, the first operating device is configured to initiate the build-up of hydraulic pressure via the liquid supply, which is connected in a fluid-conducting manner to all the first chambers of the pressure chambers of the parallel-connected working cylinders. In particular, the first operating device is adapted to initiate the construction of hydraulic pressure via the liquid supply, which is fluid-conductively connected to all the second chambers of the pressure chambers of the last of the extension cylinders connected in series with a working cylinder. As a result of the series connection of the expansion cylinders, the expansion cylinders connected in series with the working cylinders can also be adjusted simultaneously with the first operating device.

Another preferred embodiment of the actuating device according to the invention has a second operating device by means of which several or all adjusting cylinders are adjustable at the same time. Preferably, the second operating device comprises one or more operating elements, such as one or more switches and / or one or more push buttons. The second operating device may also have a display and / or a touchscreen. In addition, the first operating device and the second operating device can be combined to form a common operating unit. In particular, the second operating device is set up to initiate the buildup of hydraulic pressure via the liquid supply, which is fluid-conductively connected to the first chamber of the pressure chamber of the first of the series-connected adjusting cylinders. In particular, the second operating device is set up to initiate the buildup of hydraulic pressure via the fluid supply which is fluid-conductively connected to the second chamber of the pressure chamber of the last of the series-connected adjusting cylinders.

The actuating device according to the invention is advantageously further developed in that the position of a Stop surface, which defines one of the end positions of a working piston, is adjustable. The hydraulic adjustability of the position of the stop surfaces on the one hand overcomes the need for manually setting an end position of the working piston and on the other hand is opened by the hydraulic realization of the stop surface adjustment the ability to use mechanically simple and thus relatively error-resistant constructions. Because of these properties, the actuating device according to the invention is particularly suitable, for example, for variably setting the tool depth of tillage tools. The tillage tools can be connected in known manner to the working piston, so that the tool depth of the tillage tools on the position of the respective stop surfaces can be determined. In particular, the stop surfaces for the working piston of the working cylinder are simultaneously adjustable by the second operating device.

In a preferred embodiment of the actuating device according to the invention the abutment surface is in the variable end position of the working piston with the working piston or with an extension connected to the working piston in contact. By the coming into contact of the working piston or the extension connected to the working piston with the abutment surface, further movement of the working piston beyond this end position is prevented. Preferably, the working cylinder has a piston rod which is connected to the working piston on a first side of the working piston. In particular, the portion of the working piston, which is in contact with the hydraulically adjustable abutment surface in the variable end position of the working piston, or the extension on a second, the first side opposite side of the working piston is arranged. By the extension of the direct force can be prevented on the working piston, so that the stop position is spaced from the working piston. The use of an extension also allows the use of different materials for the working piston and the extension, so there is no need to find a material compromise for the working piston and the stop surface. The extension can be materially connected to the working piston. The connection between the extension and the working piston may for example be a welded connection or an adhesive connection. Furthermore, the extension and the piston can be integral components of a component which have been jointly produced, for example, by a prototype manufacturing process.

In an advantageous development of the actuating device according to the invention, the position of the stop surface within the pressure chamber of the working cylinder is adjustable. For this purpose, it is necessary that a hydraulically adjustable stop element protrudes into the pressure chamber of the working cylinder. For this purpose, the pressure chamber of the working cylinder preferably has an opening. It is preferred that the piston rod of the working piston is arranged in the first chamber of the pressure chamber of the working piston and the opening for the stop element in the second chamber of the pressure chamber of the working piston. Alternatively, the position of the stop surface may also be outside the pressure chamber of the working cylinder. In this case, preferably, the extension connected to the working cylinder extends through the opening of the second chamber of the pressure chamber of the working cylinder.

In a further embodiment of the actuating device according to the invention, the adjusting cylinders each have a setting piston which is movable back and forth between two end positions within a pressure space and in each case an adjusting piston of a setting cylinder and the stop surface of a working cylinder are coupled together. By a movement of the adjusting piston thus the position of the stop surface can be changed. Preferably, the adjusting piston of the adjusting cylinder and the abutment surface are coupled in such a way that the stop surface always moves together with the adjusting piston of the adjusting cylinder during a movement of the adjusting piston of the adjusting cylinder. If the position of the stop surface is outside the pressure chamber of the working cylinder, this may thus be, for example, within the pressure chamber of the adjusting cylinder.

The actuating device according to the invention is further developed advantageous in that the pressure chamber in each case a working cylinder and the pressure chamber in each case a setting cylinder are spaced from each other and arranged within a common housing. By the common housing thus a double cylinder is formed, which has two spaced apart pressure chambers, wherein the double cylinder thus comprises the working cylinder and the adjusting cylinder. Preferably, the common housing is integrally formed. Alternatively, the common housing may also be in two parts or in several parts, wherein the individual components were subsequently connected cohesively to one another. In a further alternative embodiment, the pressure chamber of the working cylinder and the pressure chamber of the adjusting cylinder can also be formed in separate housings. The separate housing can also be frictionally interconnected, for example.

In an advantageous embodiment of the actuator according to the invention are the Setting piston each connected to a stop member which extends into the pressure chamber of a working cylinder and carries the stop surface for the respective working piston. Preferably, the stop element is integrally connected to the adjusting piston or the stop element and the adjusting piston are integral components of a common component. Preferably, the stop element extends through a passage which connects the pressure chamber of the working cylinder and the pressure chamber of the adjusting cylinder, wherein in the region of the passage one or more seals are arranged, which prevents a fluid exchange between the pressure chamber of the working cylinder and the pressure chamber of the adjusting cylinder.

In a preferred embodiment of the actuating device, the stop element is designed as a piston rod and the stop surface is preferably arranged on the end face of the piston rod facing away from the adjusting piston. Preferably, the adjusting piston is connected on a first side with a first piston rod which carries the abutment surface, and on a second side with a second piston rod which extends through a passage which is arranged on the pressure chamber of the working cylinder side facing away from the pressure chamber of the adjusting cylinder is. Preferably, the second piston rod projects out of the housing at least in an end position of the working piston.

In a preferred embodiment of the actuating device according to the invention, the longitudinal axis of the pressure chamber in each case of a working cylinder and the longitudinal axis of the pressure chamber in each case a setting cylinder are substantially parallel or coaxial. The pressure chamber of the working cylinder and / or the pressure chamber of the adjusting cylinder preferably has a round cross-section. Furthermore, the working piston and / or the adjusting piston have a round cross-section. In addition, it is preferred that the longitudinal axis of the working piston and the longitudinal axis of the stop element are formed coaxially, so that the stop surface comes into contact centrally with the working piston or an extension connected to the working piston. The impact force produced by the contact can thus be absorbed in a particularly homogeneous manner by the adjusting piston, the extension and / or the stop element, thereby avoiding local stress peaks when the stop surface and the working cylinder or extension come into contact.

Also preferred is an actuating device according to the invention, in which the pressure chamber of the working cylinder has a larger volume than the pressure chamber of the adjusting cylinder and / or the maximum adjustable piston travel between the two end positions of the working piston is greater than the piston travel between the two end positions of the adjusting piston. Characterized in that the maximum adjustable piston travel between the two end positions of the working piston is greater than the piston travel between the two end positions of the adjusting piston, it is avoided that the stop surface is movable so far in the direction of the working piston, that the working piston within the pressure chamber of the working cylinder no longer is mobile. It remains thus even at maximum Kolbenwegverkürzung by the corresponding setting of the stop surface traversability of the working piston.

In a further embodiment of the actuating device according to the invention, the working cylinder and / or the adjusting cylinder are designed as double-acting cylinders. Characterized in that the working cylinder and / or the adjusting cylinder are designed as double-acting cylinder, each of both chambers can be acted upon by hydraulic pressure to move the respective piston either in a first direction or in a second opposite direction.

The object underlying the invention is further achieved by an agricultural tillage machine of the type mentioned, wherein the actuating device is formed according to one of the embodiments described above. With regard to the advantages and modifications of the agricultural tillage machine according to the invention will refer to the advantages and modifications of the actuator according to the invention.

In a particularly preferred embodiment of the agricultural tillage machine according to the invention, the actuating device is adapted to set an adjustable tool depth of several or all tillage tools in a working position. Alternatively or additionally, the actuating device is adapted to move several or all tillage tools between the lowered working position and a raised passive position. The agricultural tillage machine may for example be a harrow, wherein the tillage tools may be formed as discs. In tillage, different tool depths must be set in the working position of the tillage tools depending on the condition of the ground and the driving speed, in order to achieve an optimal machining result. In addition, the tillage tools in some situations, for example, in the headland to spend in a raised passive position, in which should take place no processing of the soil by the tillage tools. The process of the machining tools between the working position and the passive position can be done by the working cylinder.

In addition, an agricultural tillage machine is preferred in which the adjusting cylinders are adapted to set the adjustable tool depth of several or all tillage tools in the working position. The definition of the tool depth is carried out via the adjustable stop surfaces for the working cylinder, which are set via the adjusting cylinder. By the method of the stop surfaces for the working piston one of the end positions of the respective working piston is determined in each case.

In another preferred embodiment of the agricultural tillage machine, the working cylinders are set up to move a plurality of, preferably all, tilling tools arranged in a first transversal transverse direction to the direction of travel between the lowered working position and a raised passive position. Preferably, the working cylinders are each connected to a support arm, wherein in each case a plurality of soil working tools are attached to the support arms. In particular, the support arms and the attached tillage tools are each pivotable about a horizontal and substantially transverse to the direction of travel pivot axis by means of a working cylinder.

The agricultural tillage machine according to the invention is further developed advantageous in that the extension cylinders are adapted to move a plurality, preferably all arranged in one or more substantially parallel to and in the direction of travel behind the first transverse row transverse tillage tools between the lowered working position and a raised passive position , Preferably, the extension cylinders are each connected to a support arm, wherein in each case a plurality of soil working tools are attached to the support arms. In particular, the support arms and the tillage tools attached thereto are each pivotable about a horizontal and substantially transverse to the direction of travel pivot axis by means of an expansion cylinder.

• 1 ein Ausführungsbeispiel der erfindungsgemäßen landwirtschaftlichen Bodenbearbeitungsmaschine in einer perspektivischen Darstellung;
• 2 ein Ausführungsbeispiel der erfindungsgemäßen Betätigungsvorrichtung in einer Seitenansicht;
• 3 eine Schnittdarstellung der Betätigungsvorrichtung aus der 2;
• 4 ein Ausführungsbeispiel der erfindungsgemäßen Betätigungsvorrichtung in einem ersten Zustand in einer schematischen Darstellung;
• 4A Teile der in der 4 schematisch dargestellten Betätigungsvorrichtung in einer Seitenansicht;
• 4B Teile der in der 4 schematisch dargestellten Betätigungsvorrichtung in einer Schnittdarstellung;
• 5 ein Ausführungsbeispiel der erfindungsgemäßen Betätigungsvorrichtung in einem zweiten Zustand in einer schematischen Darstellung;
• 5A Teile der in der 5 schematisch dargestellten Betätigungsvorrichtung in einer Seitenansicht;
• 6 ein Ausführungsbeispiel der erfindungsgemäßen Betätigungsvorrichtung in einem dritten Zustand in einer schematischen Darstellung;
• 6A Teile der in der 6 schematisch dargestellten Betätigungsvorrichtung in einer Seitenansicht;
• 6B Teile der in der 6 schematisch dargestellten Betätigungsvorrichtung in einer Schnittdarstellung;
• 7 ein Ausführungsbeispiel der erfindungsgemäßen Betätigungsvorrichtung in einem vierten Zustand in einer schematischen Darstellung; und
• 7A Teile der in der 7 schematisch dargestellten Betätigungsvorrichtung in einer Seitenansicht.

Further details of the invention can be taken from the description of the figures and the drawings. Show it

• 1 an embodiment of the agricultural tillage machine according to the invention in a perspective view;
• 2 an embodiment of the actuating device according to the invention in a side view;
• 3 a sectional view of the actuator of the 2 ;
• 4 an embodiment of the actuating device according to the invention in a first state in a schematic representation;
• 4A Parts of in the 4 schematically illustrated actuating device in a side view;
• 4B Parts of in the 4 schematically illustrated actuating device in a sectional view;
• 5 an embodiment of the actuating device according to the invention in a second state in a schematic representation;
• 5A Parts of in the 5 schematically illustrated actuating device in a side view;
• 6 an embodiment of the actuator according to the invention in a third state in a schematic representation;
• 6A Parts of in the 6 schematically illustrated actuating device in a side view;
• 6B Parts of in the 6 schematically illustrated actuating device in a sectional view;
• 7 an embodiment of the actuator according to the invention in a fourth state in a schematic representation; and
• 7A Parts of in the 7 schematically illustrated actuating device in a side view.

The 1 shows an agricultural tillage machine designed as a disc harrow 10 , The tillage tools 12 . 14 the agricultural tillage machine 10 are arranged in two substantially transverse to the direction of travel and arranged parallel to each other transverse rows. The tillage tools 12 . 14 are formed as disks, wherein the tool depth of the tillage tools 12, 14 is adjustable in a working position for adaptation to the ground conditions and the driving speed.

The arranged in the first transverse row tillage tools 12 are on a total of four support arms 16a-16d attached. The arranged in the second transverse row tillage tools 14 are also on a total of four support arms 18a-18d attached.

The support arms 16a-16d and the tillage tools 12 attached thereto are by means of a hydraulic actuator 20 pivotable about a horizontal and substantially transverse to the direction of travel pivot axis. The support arms 18a-18d and the tillage tools attached thereto 14 are also by means of the hydraulic actuator 20 pivotable about a horizontal and substantially transverse to the direction of travel pivot axis.

For pivoting the support arms 16a-16d has the actuator 20 four double cylinders 22a-22d on, wherein the double cylinders 22b, 22c at the middle segment of the machine frame 26 and the double cylinders 22a, 22d each on a side segment of the machine frame 28a . 28b are attached. For pivoting the support arms 18a-18d has the actuator 20 four extension cylinders 24a-24d on, wherein the extension cylinders 24b, 24c at the middle segment of the machine frame 26 and the extension cylinders 24a, 24d each on a side segment of the machine frame 28a . 28b are attached.

The actuator 20 is set to the adjustable tool depth of tillage tools 12 . 14 in the working position. Further, the actuator is 20 set up the tillage tools 12 . 14 between the lowered working position and a raised passive position to move.

The middle segment of the machine frame 26 and the side segments of the machine frame 28a . 28b are about a first swing cylinder pair 30a . 30b and a second swing cylinder pair 32a . 32b connected with each other. By means of the swivel cylinder pairs 30a . 30b . 32a . 32b can the machine frame 26, 28a, 28b collapse on road transport width.

Behind the tillage tools 12 . 14 are follower rollers 34a-34d arranged, which serve for reconsolidation of the soil. Before the tillage tools 12 . 14 are support wheels 36a-36d arranged, which is the agricultural tillage machine 10 support against the ground. In addition, the agricultural tillage machine has 10 via a coupling device 38 , by means of which the agricultural tillage machine 10 can be coupled to a tractor or a machine network.

The 2 and the 3 show a double cylinder 22 a hydraulic actuator 20 , The double cylinder 22 has a working cylinder 40 and a setting cylinder 42 on. The working piston 48 of the working cylinder 40 is inside a pressure room 46 movable between two end positions. Furthermore, the working piston 48 via a piston rod 54 with a fastening member 56 connected. The adjusting piston 60 of the adjusting cylinder 42 is also inside a pressure room 58 movable between two end positions. The pressure room 46 of the working cylinder 40 and the pressure room 58 of the adjusting cylinder 42 are spaced from each other and within a common housing 44 arranged.

The double cylinder 22 has a stop surface 52 on whose position hydraulically via the adjusting cylinder 42 is adjustable, wherein by means of the hydraulic adjustment of the position of the stop surface 52 one of the end positions of the working piston 48 is variable. The adjusting piston 60 is with a trained as a piston rod stop element 62 connected, which is through a passage 66 in the pressure room 46 of the working cylinder 40 extends and the stop surface 52 wearing. The stop surface 52 is at the adjusting piston 60 arranged away from the end face of the piston rod. In the area of the passage 66 is a seal 68 arranged, which the pressure room 46 of the working cylinder 40 opposite the pressure chamber 58 of the adjusting cylinder 42 seals.

The stop surface 52 is in the variable end position of the working piston 48 with a with the working piston 48 connected extension 50 in contact. Due to the fact that the stop element 62 in the pressure room 46 of the working cylinder 40 extends, is the position of the stop surface 52 within the pressure chamber 46 of the working cylinder 40 adjustable. The pressure room 46 of the working cylinder 40 has a larger volume than the pressure chamber 58 of the adjusting cylinder 42 , Furthermore, the maximum adjustable piston travel between the two end positions of the working piston 48 greater than the piston travel between the two end positions of the adjustment piston 60 , The longitudinal axis of the pressure chamber 46 of the working cylinder 40 and the longitudinal axis of the pressure chamber 58 of the adjusting cylinder 42 are coaxial.

On the adjusting piston 60 of the adjusting cylinder 42 is also a piston rod 64 fastened, extending through a passage 70 extends and protrudes from the housing 44. In the area of the passage 70 is a seal 72 disposed which the pressure room 58 of the adjusting cylinder 42 towards the environment of the housing 44 seals.

The 4 shows a hydraulic actuator 20 with a total of four double cylinders 22a-22d and four extension cylinders 24a-24d , The double cylinder 22a-22d each comprise a working cylinder 40a-40d and a setting cylinder 42a-42d ,

The hydraulic actuator 20 comprises a first operating device 74, by means of which the working cylinder 40a-40d are adjustable at the same time, and a second operating device 76 , by means of which the adjusting cylinder 42a-42d are adjustable at the same time.

The working cylinders 40a-40d are connected in parallel. The working cylinders 40a-40d each have a first chamber and a second chamber within the pressure chamber. To implement the parallel connection of the working cylinder 40a-40d are all first chambers of the pressure chambers of the working cylinder 40a-40d over the fluid line 80 fluid-conducting with a common fluid supply of a hydraulic system 78 connected.

In each case a working cylinder 40a-40d and an extension cylinder 24a-24d are connected in series. The extension cylinders 24a-24d each have a first chamber and a second chamber within the pressure chamber. To implement the series connection, the second chamber of the pressure chamber of the working cylinder 40a is fluid-conductively connected to the first chamber of the pressure chamber of the expansion cylinder 24a via the fluid line 82a. The second chamber of the pressure chamber of the working cylinder 40b is fluid-conductively connected to the first chamber of the pressure chamber of the expansion cylinder 24b via the fluid line 82b. The second chamber of the pressure chamber of the working cylinder 40c is fluid-conductively connected to the first chamber of the pressure chamber of the extension cylinder 24c via the fluid line 82c. The second chamber of the pressure chamber of the working cylinder 40d is fluid-conductively connected via the fluid line 82d to the first chamber of the pressure chamber of the extension cylinder 24d. All second chambers of the pressure chambers of the extension cylinders 24a-24d are over the fluid line 84 fluid-conducting with a common fluid supply of the hydraulic system 78 connected. The extension cylinders 24a-24d each have a pressure chamber whose cross-sectional area substantially the cross-sectional area of the pressure chamber 46 the working cylinder 40a-40d equivalent.

The adjusting cylinder 42a-42d are connected in series. The adjusting cylinder 42a-42d each have a first chamber and a second chamber within the pressure chamber. The first chamber of the pressure chamber of the adjusting cylinder 42a is fluid-conducting via the fluid line 86a to a liquid supply of the hydraulic system 78 connected. The second chamber of the pressure chamber of the adjusting cylinder 42a is fluid-conductively connected to the first chamber of the pressure chamber of the adjusting cylinder 42b via the fluid line 86b. The second chamber of the pressure chamber of the adjusting cylinder 42b is fluid-conductively connected to the first chamber of the pressure chamber of the adjusting cylinder 42c via the fluid line 86c. The second chamber of the pressure chamber of the adjusting cylinder 42c is fluid-conductively connected to the first chamber of the pressure chamber of the adjusting cylinder 42d via the fluid line 86d. The second chamber of the pressure chamber of the adjusting cylinder 42d is fluid-conducting via the fluid line 86e with a fluid supply of the hydraulic system 78 connected.

In the illustrated state, the adjusting pistons of the adjusting cylinders 42a-42d are located in the end position facing away from the working cylinder. Thereby, that the adjusting piston of the adjusting cylinder 42a-42d are in the working cylinder remote end position, the maximum piston travel for the working piston of the working cylinder 42a-40d is released, wherein the working piston of the working cylinder 40a-40d in the illustrated state in each case with the abutment surface, which is located on the end face of the piston rod of the respective adjustment cylinder 42a-42d is in contact.

Fig. 4A and the 4B show that the working piston 48 of the working cylinder 40a via the piston rod 54 and the attachment member 56 with the lever 90 connected is. The lever 90 is connected to the support arm 16a, over which the tillage tools 12 , which have supporting struts 92 are connected to the support arm 16a, can be pivoted. The tillage tools 14 are connected via the support arm 18a to the extension cylinder 24a. In the illustrated state, the working piston is located 48 in the upper end position, allowing the tillage tools 12 . 14 are lowered in the working position maximum. The support wheel 36a is above the fastener 88 on the machine frame 28a attached.

The 5 and the 5A show a state in which the tillage tools 12 . 14 were moved to a raised passive position. The state can be based on that in the 4 shown state can be achieved that on the operating device 74 the hydraulic pressure in the fluid line 80 is increased so that the working piston of the working cylinder 40a-40d be moved to the second end position. By the series connection of the working cylinder 40a-40d with the expansion cylinders 24a-24d, the working cylinder becomes the working cylinder by the method 40a-40d also the pistons of the extension cylinders 24a-24d procedure, so that all tillage tools 12 . 14 be raised at the same time. The tillage tools 12 . 14 For example, spend in the headlands in the passive position, so that the engagement of the tillage tools 12, 14 is temporarily suspended in the soil.

The 6 , Fig. 6A and the 6B show a state in which the tillage tools 12 . 14 are in the working position, wherein the working depth of the tillage tools 12,14 is set higher than in the 4 , The adjustment of the working depth of the tillage tools 12 , 14 takes place via the adjusting cylinder 42a-42d , With the adjusting cylinders 42a-42d can change the position of the stop surface for the working cylinder 40a-40d be set. By the stop surface is the mobility of the working piston of the working cylinder 40a-40d and thus also the tool depth of the tillage tools 12 . 14 limited. The coupling of tillage tools 12 and tillage tools 14 again takes place via the series connection between the working cylinders 40a-40d and the extension cylinders 24a-24d ,

The 7 and the 7A show a state in which the tillage tools 12 . 14 were again moved to a raised passive position. The state can be based on that in the 6 shown state can be achieved again by the fact that the control device 74 the hydraulic pressure in the fluid line 80 is increased so that the working piston of the working cylinder 40a-40d be moved to the second end position. By the series connection of the working cylinder 40a-40d with the expansion cylinders 24a-24d, the working cylinder becomes the working cylinder by the method 40a-40d also the pistons of the extension cylinders 24a-24d procedure, so that all tillage tools 12 . 14 be raised at the same time.

LIST OF REFERENCE NUMBERS

10

agricultural tillage machine

12

Tillage tools

14

Tillage tools

16a-16d

carrying arms

18a-18d

carrying arms

20

hydraulic actuator

22, 22a-22d

double cylinder

24a-24d

expansion cylinder

26

machine frame

28a, 28b

machine frame

30a, 30b

swing cylinders

32a, 32b

swing cylinders

34a-34d

idlers

36a-36d

training wheels

38

coupling device

40, 40a-40d

working cylinder

42, 42a-42d

setting cylinders

44

casing

46

pressure chamber

48

working piston

50

extension

52

stop surface

54

piston rod

56

attachment member

58

pressure chamber

60

adjusting piston

62

stop element

64

piston rod

66

passage

68

poetry

70

passage

72

poetry

74

first operating device

76

second operating device

78

hydraulic system

80

fluid line

82a-82d

fluid lines

84

fluid line

86a-86e

fluid lines

88

fastener

90

lever

92

supporting strut

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The 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

• DE 102004025522 A1 [0003]
• EP 2965599 A1 [0003]
• EP 1616471 A2 [0004]
• EP 1614335 A2

Claims (20)

A hydraulic operating device (20) for an agricultural tillage machine (10), comprising - a plurality of working cylinders (40, 40a-40d) whose respective working piston (48) is reciprocable within a pressure space (46) between two end positions; and - a plurality of adjusting cylinders (42, 42a-42d) by means of which one of the end positions of the working piston (48) of a working cylinder (40, 40a-40d) is variable in each case; characterized in that individual or all adjusting cylinders (42, 42a-42d) are connected in series. Actuator (20) according to Claim 1 , characterized in that individual or all working cylinders (40, 40a-40d) are connected in parallel. Actuator (20) according to Claim 1 or 2 characterized by a plurality of extension cylinders (24a-24d), wherein in each case one working cylinder (40, 40a-40d) and one or more extension cylinders (24a-24d) are connected in series. Actuator (20) according to Claim 3 characterized in that the one or more extension cylinders (24a-24d) connected in series with a power cylinder (40, 40a-40d) have a pressure space whose cross-sectional area is substantially equal to the cross-sectional area of the pressure space (46) of the power cylinder (40, 40a-40d). Actuating device (20) according to one of the preceding claims; characterized by a first operating device (74), by means of which several or all working cylinders (40, 40a-40d) are adjustable at the same time. Actuating device (20) according to one of the preceding claims, characterized by a second operating device (76), by means of which several or all adjusting cylinders (42, 42a-42d) are simultaneously adjustable. Actuating device (20) according to any one of the preceding claims, characterized in that on the adjusting cylinder (42, 42a-42d) respectively the position of a stop surface (52) which defines one of the end positions of a working piston (48) is adjustable. Actuator (20) according to Claim 7 , characterized in that the abutment surface (52) in the variable end position of the working piston (48) with the working piston (48) or with an associated with the working piston (48) extension (50) is in contact. Actuator (20) according to Claim 7 or 8th , characterized in that the position of the abutment surface (52) within the pressure chamber (46) of the working cylinder (40, 40a-40d) is adjustable. Actuator (20) after a Claims 7 to 9 , characterized in that the adjusting cylinders (42, 42a-42d) each have a setting piston (60) which is reciprocally movable within a pressure space (58) between two end positions and in each case a setting piston (60) of a setting cylinder (42, 42a -42d) and the abutment surface (52) of a working cylinder (40, 40a-40d) are coupled together. Actuator (20) according to Claim 10 , characterized in that the pressure chamber (46) in each case a working cylinder (40, 40a-40d) and the pressure chamber (58) in each case a setting cylinder (42, 42a-42d) spaced from each other and within a common housing (44) are arranged. Actuator (20) according to Claim 10 or 11 , characterized in that the adjusting piston (60) are each connected to a stop element (62) which extends into the pressure chamber (46) of a working cylinder (40, 40a-40d) and the abutment surface (52) for the respective working piston (48 ) wearing. Actuator (20) according to Claim 12 Characterized in that the stop element (62) is designed as a piston rod and the stop surface (52) end face of the piston rod, preferably on the adjusting piston to the (60) facing away is located. Actuating device (20) according to one of Claims 10 to 13 , characterized in that the longitudinal axis of the pressure chamber (46) in each case a working cylinder (40, 40a-40d) and the longitudinal axis of the pressure chamber (58) in each case a setting cylinder (42, 42a-42d) are substantially parallel or coaxial. Actuating device (20) according to one of Claims 10 to 14 , characterized in that the pressure chamber (46) of the working cylinder has a larger volume than the pressure chamber (58) of the adjusting cylinder (42, 42a-42d) and / or the maximum adjustable piston travel between the two end positions of the working piston (48) is greater than the piston travel between the two end positions of the adjustment piston (60). Agricultural tillage machine (10), with - a hydraulic actuator (20) for adjusting tillage tools (12, 14); characterized in that the actuating device (20) is designed according to one of the preceding claims. Agricultural tillage machine (10) according to Claim 16 , characterized in that the actuating device (20) is adapted to set an adjustable tool depth of several or all tillage tools (12, 14) in a working position and / or more or all tillage tools (12, 14) between the lowered working position and a raised passive position to move. Agricultural tillage machine (10) according to Claim 16 or 17 , characterized in that the adjusting cylinders (42, 42a-42d) are adapted to set the adjustable tool depth of several or all tillage tools (12, 14) in the working position. Agricultural tillage machine (10) according to one of Claims 16 to 18 , characterized in that the working cylinders (40, 40a-40d) are adapted to move a plurality, preferably all arranged in a first transversely to the direction of travel transverse row tillage tools (12) between the lowered working position and a raised passive position. Agricultural tillage machine (10) according to one of Claims 16 to 19 , characterized in that the extension cylinders (24a-24d) are adapted to a plurality, preferably all arranged in one or more substantially parallel to and in the direction of travel behind the first transverse row transverse tillage tools (14) between the lowered working position and a raised passive position to move.

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