DE102023101469A1 - Agricultural implement - Google Patents

Abstract

The present invention relates to an agricultural implement with a frame and a chassis arranged on the frame, the chassis having at least a first partial chassis and a second partial chassis, which are arranged essentially next to one another in a direction of travel and each have at least one wheel, the at least one wheel of the first partial chassis being arranged on a first axle line and the at least one wheel of the second partial chassis being arranged on a second axle line, the first axle line and the second axle line being arranged at an axle distance from one another in the direction of travel of the implement. at least one third sub-carriage being arranged between the first and second sub-carriage, the third sub-carriage having at least one third axle line with at least one wheel arranged thereon, and being arranged on the chassis in a height-adjustable manner by means of a hydraulic servomotor. According to the invention, the third sub-carriage is arranged in such a way that the third axis line is arranged between the first axis line and the second axis line, in particular in a working position and/or a transport position of the implement.

Description

The present invention relates to an agricultural implement according to claim 1.

Above a certain weight limit, agricultural implements must be equipped with a brake system for operation and for road traffic in order to achieve the legally required braking. At the same time, the axle loads of the implements are limited by law in order to avoid damage to paths or roads. In order to reconcile both legal requirements, unbraked auxiliary axles are also used on agricultural implements, on the one hand to distribute the weight over several axles, but on the other hand to equip only part of the chassis axles with braking devices in order to have the necessary installation space for several axles To reduce the complexity of a braking system and its costs.

Such a combination chassis with braked axles and unbraked auxiliary axles is disclosed in the disclosure DE 10 2019 120 535 A1 suggested. There, the vertical loads of the individual axles are recorded by sensors and the load on the auxiliary axle is electronically controlled, also with a view to the braking effect and the brake axle loads required for this. The control objectives diverge between road travel and field travel with, for example, spreading operation. While when driving on the road it is important to load the brake axle up to the legally permissible axle load in order to achieve maximum braking performance without premature locking of the wheels in the event of emergency braking, when driving in the field in the working position it is important to distribute the implement weight as evenly as possible on all wheels / axles to reduce the soil pressure that is harmful to arable land. The divergent control objectives require complex, expensive and possibly failure-prone control technology.

The object of the invention is a structurally simple and cost-effective solution to resolve or at least improve the conflict of objectives between maximum axle load on the brake axles for improved braking when driving on roads and reduced ground pressure when driving in the field due to the implement standing up on all axles.

The object is achieved by an implement according to the features of claim 1. Advantageous refinements of the invention are specified in the dependent claims.

An agricultural implement, in particular for tillage, has a frame and a chassis arranged on the frame, the chassis having at least a first part of the chassis and a second part of the chassis, which are arranged essentially next to one another in a direction of travel and each have at least one wheel, wherein the at least one wheel of the first sub-carriage is arranged on a first axle line and the at least one wheel of the second sub-carriage is arranged on a second axle line, the first axle line and the second axle line being arranged at an axle spacing from one another in the direction of travel of the implement, with between the first and second sub-undercarriage at least one third sub-undercarriage is arranged, wherein the third sub-undercarriage has at least one third axle line with at least one wheel arranged thereon, and is arranged on the undercarriage in a height-adjustable manner by means of a hydraulic servomotor. According to the invention, the third sub-carriage is arranged in such a way that the third axis line is arranged between the first axis line and the second axis line, particularly in a working position and/or a transport position of the implement, particularly in the direction of travel.

The implement is only in a working position outside of public traffic areas, for example when driving on a field or grassland, in which, for example, a spreading operation can take place, so that no legally required braking from road traffic takes effect. In a transport position of the implement, on the other hand, all the requirements for public road traffic, especially with regard to the brake system, axle loads and implement dimensions, must be met. By subdividing the running gear into partial running gears, the different requirements can be better taken into account. The weight of the implement can usually be carried and braked in a transport position on the road by a first and second sub-carriage. The sub-carriages each have at least one, usually two, wheels which are arranged on a first and a second axle line and can thus form a tandem axle with a corresponding maximum axle load. The axle spacing in the direction of travel between the first and second axle line can be less than 1.3 m, preferably less than 1 m, preferably less than 0.5 m and particularly preferably 0.1 m.

According to the invention, at least one third sub-carriage is provided, the at least one wheel of which is arranged on a third axle line, the third axle line being arranged in the direction of travel between the first and second axle line, in particular in a working position and/or transport position. As a result, a third axis can be designed in accordance with legal regulations, whereby the maximum permissible axle load in road traffic can be further increased. The third part of the chassis can be designed, for example, as an unbraked auxiliary axle, and can be pivotally connected to the frame of the implement with an axle swing arm and a servomotor. By connecting the axle rocker to the frame via a joint bearing, a stable, pivotable arrangement is realized with which the third sub-carriage, in particular the auxiliary axle, can be pivoted relative to the frame and can be moved up and down relative to the ground surface by the servomotor. The wheels of the sub-carriages, in particular of the first, second and third sub-carriages, can remain in contact with the ground in the working position and/or transport position of the implement. The axle loads of the sub-carriages can be essentially the same, particularly in the working position. In a transport position of the implement, the axle loads of the implement can be the same or different; in particular, the third sub-carriage can be subjected to a variable, controllable pressure by means of the servomotor, as a result of which an axle load acting on the first and second sub-carriage can be limited.

By arranging the third sub-carriage in such a way that its third axis line is arranged between the first and second axis line of the first and second sub-carriage, a third axis can be provided without structural changes to the position of the first and second sub-carriage, thereby increasing the permissible weight of the implement, especially on public roads, can be made possible.

At least one sub-carriage is preferably designed as a tandem axle with two wheels, with the wheels of the sub-carriage being arranged on the same or different axle lines. Due to the design as a tandem chassis, the weight of the implement can be distributed more evenly and undesirable soil compaction can be avoided.

In a preferred embodiment, at least the wheels of the first and second sub-carriage are assigned to a common or individual brake axle and the at least one wheel of the third sub-carriage is assigned to a braked or unbraked auxiliary axle. The respective at least one wheel of the first and second sub-carriage can be an outer wheel and the at least one wheel of the third sub-carriage can be a middle wheel. At least the two outer wheels are associated with a common or individual brake axles. At least one middle wheel, preferably a pair of middle wheels, is assigned to an unbraked auxiliary axle, the unbraked auxiliary axle being arranged on the transport chassis so that it can be adjusted in height by means of a hydraulic servomotor.

In a preferred embodiment, the implement has at least one hydraulically driven unit with a drive that is connected to a hydraulic pressure source, with both the drive of the unit and the servomotor being directly fluidly connected to the same pressure source. The implement has at least one hydraulically driven unit, for example a soil cultivation tool, an application device or a fan. The unit is connected to a hydraulic pressure source, with both the drive of the unit and the servomotor being directly fluidly connected to the same pressure source. The working device is operated in the working position outside of public traffic areas, for example when driving in fields on arable or grassland soil. The unit can be put into operation by subjecting the unit to hydraulic pressure from the pressure source. The axle load of the third sub-carriage and its wheels on the ground can be increased by a direct fluidic connection of the pressure source to the servomotor, for example a hydraulic cylinder or hydraulic actuator, by which the third sub-carriage can be actuated in a height-adjustable manner. The dimensions of the servomotor and pressure ratios can be coordinated for safe operation of the unit so that the wheels of the third sub-carriage can absorb a, in particular the same, proportion of the weight of the implement as the adjacent first and second sub-carriage. When the hydraulic pressure source is switched to zero pressure, the servomotor can also be switched to be free of actuating force in addition to the hydraulically driven unit. As a result, the third part of the running gear can also be switched without force, that is to say in a floating position. The third sub-carriage can be provided with an end stop, so that both the wheels of the first and second sub-carriage, in particular the brake axles, and the wheels of the third sub-carriage, in particular the auxiliary axles, can assume approximately the same position on a level ground surface. The end stop can be implemented in such a way that the servomotor for adjusting the height of the third sub-carriage, in particular the auxiliary axle, has a maximum or minimum installation dimension and thus a corresponding end position of the adjustment movement. An end stop can also be designed in the form of a lockable position, in particular a lockable end position. The end stop can be designed to be adjustable, so that the lower position of a wheel of the third part of the chassis kes, in particular the auxiliary axle, slightly exceeds the position of the wheels of the first and second part of the running gear, in particular the brake axles, downwards.

In addition to the hydraulic pressure source, the drive is preferably connected to a return, in particular an unpressurized return. By operating the drive with a hydraulic pressure source, it builds up a significant back pressure by delivering drive power. In the case of a continuously rotating drive, a preferably unpressurized return is required for the outflow of hydraulic fluid from the hydraulic pressure source. The servomotor of the third sub-carriage, in particular the auxiliary axle, can be actuated with the counter-pressure caused or built up by the drive power delivered. At the same time, an overload of the third sub-carriage, in particular the auxiliary axle or the servomotor, which exceeds the back pressure generated by the drive to operate the unit, can cause an overload pressure, for example if the third sub-carriage, in particular the auxiliary axle, hits an obstacle or a bump. The overload pressure can escape through the return line of the drive by overcoming the pressure drop across the hydraulic drive. Since the back pressure of the drive increases only slightly and temporarily as a result, there is no need for additional pressure protection of the servomotor against overload. The third sub-carriage, in particular the auxiliary axle, can thus always be sprung and resiliently secured against overload in a working position of the implement. Nevertheless, approximately the same ground pressure can be applied to the ground traveled on by all wheels.

In a further preferred embodiment, the two outer wheels of the first and second part of the running gear are each associated with another wheel that is further inwardly adjacent to one, in particular the same, or each to a brake axle. By increasing the number of wheels on the brake axles, the ground contact area of the wheels can be increased and the ground pressure caused by the weight of the implement can be further reduced. A number of the wheels on the outer sides of the implement can be as high as those in a central area, which can be assigned, for example, to the third sub-carriage, for example in the form of an unbraked auxiliary axle. For example, two wheels of the third sub-carriage can be assigned in the form of an unbraked auxiliary axle, and two further wheels, which can be assigned to a first and second sub-carriage in the form of one or more brake axles, can be arranged adjacent to each other on the respective outer side of the implement. This arrangement can apply in particular to the wheels, which relate to a transport position of the implement on public roads. All wheels may have the same dimensions and/or approximately the same wheel spacing.

In a further embodiment, the sub-carriages, in particular the brake axles and auxiliary axles, each have a pair of stub axles on which the respective wheels are rotatably mounted, the axle stubs arranged in pairs relative to one another, in particular of the first and second sub-carriages, having a horizontal axle spacing from one another in the direction of travel of the working device. Stub axles of the third sub-carriage can be arranged with an axle spacing corresponding to an axle spacing of the first and second sub-carriage, or have a smaller or larger axle spacing than the first and second sub-carriage, with at least one stub axle or axle line of the third sub-carriage between the axle lines of the first and second sub-undercarriage can be arranged. Due to the staggered arrangement of the wheels in the longitudinal direction of the implement or in its direction of travel, a relative movement of the wheels to one another can arise as a result of the wheels rolling onto the ground of the field. As a result, a self-cleaning effect can occur, with soil material jammed between the flanks of the wheels, plant residues or material deposited by the unit of the working implement being able to be ejected automatically. This offers the advantage that the chassis does not have to be cleaned before driving on public roads and blockages or malfunctions of the chassis or its brake system can be avoided.

In a further embodiment, further braked or unbraked sub-carriages, in particular auxiliary axles, are arranged adjacent to the first and second sub-carriages, in particular the brake axles of the working implement, with one or more wheels which can be pivoted or moved and which are separated from the first and second sub-carriages, in particular the brake axles , extend further outward in the direction of a width of the implement. This results in a further enlarged, cumulative wheel contact area for absorbing the weight of the implement on the ground. Due to the pivotability of the additional auxiliary axles arranged on the outside of the implement, they can be moved in a working position in which their wheels together with the wheels of the first and second sub-carriages arranged further inwards, in particular the brake axles, and the third sub-carriage, in particular the middle unbraked auxiliary axle, support the weight of the working unit on the ground. To reduce the implement width to a legally permissible transport width for road traffic the outer auxiliary axles are transferred or pivoted into a less wide, transport position above the ground. In this transport position, the implement weight can only rest on the first and second partial chassis, in particular the brake axles. The weight of the implement in the transport position can also be distributed over the first, second and third sub-carriages, with the weight distribution being able to be the same or different on the sub-carriages.

In a particularly preferred embodiment, the other sub-carriages, in particular braked or unbraked auxiliary axles, which extend further outwards from the first and second sub-carriages, in particular the brake axles, in the direction of the width of the implement, are via an auxiliary frame that can be pivoted or tilted about pivot axes connected to the implement, with the pivot axes arranged in the direction of travel or upright to the ground. Hydraulic servomotors can also be used here, which can shift the respective lateral subframes with the other wheels into the desired position. Deviating from this, the pivot axis of the axle rocker of the central auxiliary axle can be aligned transversely to the direction of travel, so that it can pivot up and down without colliding with the adjacent wheels of the brake axles.

Furthermore, preferably, in a working position of the implement, in particular when the unit is in operation, the weight of the implement is borne in approximately equal parts by the sub-carriages and their wheels, and in a transport position of the implement, in particular when the unit is not in operation, the weight of the implement is carried only by the first and second partial chassis and their wheels, in particular the brake axles. The wheel geometries and the distances between the movable bearings of the third part of the running gear, in particular the auxiliary axles, and its servomotor as well as the pressure supply and the resulting back pressures can be coordinated in such a way that when the unit is in operation in a working position, the weight of the working device is distributed almost equally by all wheels of the implement is carried evenly and in a transport position when the unit is out of service, the weight of the implement is borne only by the wheels of the first and second sub-undercarriage, in particular the brake axles.

It is advantageous that simply by starting up a hydraulically driven unit, a condition of the chassis of the working device can be set in which the weight of a working device is supported both by the wheels of the first and second partial chassis, in particular the brake axles, and by the third partial chassis, in particular one or more auxiliary axles, can be supported evenly on the ground. In a transport position on public roads, of course, no agricultural unit is actuated. Due to the necessary deactivation of the hydraulic unit, in which the pressure supply can be switched to zero pressure, the actuating force of the servomotor on the third sub-carriage, in particular the auxiliary axle, can be omitted, whereby the entire weight of the implement is transferred to the first and second sub-carriage, in particular the brake axles, so that they can achieve their full braking effect, which is required by law on public roads. By mutually excluding the operating states of the working position on a field and the transport position on public roads, in which an operator only activates or deactivates a pressure supply, all previously necessary requirements for an additional control device for the various operating states of the working device can be omitted, which is complicated and error-prone and are expensive to construct and design their required components.

In a particularly preferred embodiment, in a working position of the implement, in particular when the unit is in operation, the weight of the implement is borne in approximately equal parts by the sub-carriages and their wheels, and in a transport position of the implement, particularly when the unit is not in operation, the weight of the implement, which is carried by the first and second partial chassis, in particular the brake axles, is limited to an adjustable maximum value, in particular a maximum value prescribed by law. The first and second sub-carriage can be rigidly connected to the frame of the implement. Due to the pivotable mounting of the third sub-carriage by means of the hydraulic servomotor, a force acting on the ground through the third sub-carriage can be adjusted. In a working position, for example in a field, the third sub-carriage can be aligned with respect to the ground and/or the frame in substantially the same way as the first and second sub-carriages. This has the advantage that the weight of the implement can be distributed substantially evenly over all sub-carriages and the ground can thus be protected. In a transport position, the hydraulic servomotor of the third sub-undercarriage can be connected to and pressurized by a pressure source, for example in the form of a pressure accumulator, folding hydraulics and/or via a hydraulic system of a towing vehicle. The servomotor can in this case, after applying a pressure which is suitable for relieving the first and second part of the running gear down to a maximum permissible axle load, are locked. By locking, for example by closing a supply line, the servomotor can maintain the required pressure without a corresponding pressure having to be provided by a pressure source. The servomotor, which is in particular locked, can be connected to a pressure accumulator, for example a membrane accumulator, as a result of which overload protection for the third sub-undercarriage can be implemented. The pressure acting on the servomotor can be adjustable, as a result of which a force acting on the ground of the third sub-undercarriage connected to the servomotor can be adjustable. This makes it possible to influence the weight of the implement acting on the first and second sub-carriages, which weight can be determined, for example by means of axle load sensors, in such a way that only a maximum permissible axle load rests on the first and second sub-carriages. A weight of the implement that exceeds the permissible maximum axle load, for example 11 tons, can be absorbed by the third sub-carriage and its third axle line.

In a particularly preferred embodiment, the hydraulic servomotor is designed so that it can be subjected to an adjustable pressure. In the transport position, the wheels of the third sub-carriage can remain in contact with the ground and, by means of an adjustable support relative to the ground, can reduce an axle load acting on the first and second sub-carriage down to a maximum permissible value. The third partial chassis can have at least one braked axle.

Further details of the invention can be found in the figures and the description of the figures, which show a preferred embodiment of the invention.

• 1: eine Seitenansicht eines Arbeitsgerätes mit einem Rahmen angeordneten Fahrwerk;
• 2: eine geschnittene Draufsicht auf das in 1 gezeigte Fahrwerk mit drei Achslinien; und
• 3: eine perspektivische Ansicht des in 1 und 2 dargestellten Fahrwerkes.

Show it:

• 1 : a side view of a working device with a chassis arranged on a frame;
• 2 : a cut top view of the in 1 chassis shown with three axle lines; and
• 3 : a perspective view of the in 1 and 2 shown chassis.

In 1 an agricultural implement 1 is shown in the form of a spreading vehicle, which has a frame 2 and a chassis 3 . The chassis 3 is arranged in the rear area of the implement 1 . In the front area, the implement 1 is connected, preferably via a drawbar 26, to a towing vehicle 13, which moves the implement 1 in a direction of travel 24 over a surface of a floor 22. The ground 22 can be an agricultural field or grassland, but also a road surface. The towing vehicle 13 has a hydraulic system (not shown) with a hydraulic pump, which draws hydraulic fluid from a tank and makes it available to the pressure source 9 via a switchable valve. Furthermore, the towing vehicle 13 has a return line 25, via which the hydraulic fluid is returned to the tank without pressure or with only a slight back pressure. The hydraulic system can also be implemented as the agricultural implement 1's own hydraulic system.

However, since agricultural towing vehicles 13 are usually equipped with hydraulic systems, it is advantageous to use the pressure supply 9 and the return 25 as detachable couplings for separating the towing vehicle 13 and implement 1 . The pressure supply 9 is designed to be switchable on the side of the implement 1 or the towing vehicle 13 . The working device 1 can be a hydraulic push-off truck, for example. The unit 8 can be a discharge device in the form of a displaceable wall of the container 20, which, by means of a drive 10, which is then designed as a hydraulic cylinder, unloads material 21 to the rear out of the container 20 and, for example, feeds it to a distribution device 17.

The drive 10 is connected to the pressure source 9 via the lines 27 and 29 . At the same time, a T-connector 30 branches off the connection between pressure source 9 and line 27 into a further line 28 which is connected to servomotor 7 . By switching on the pressure source 9, the drive 10 is put into operation and generates a back pressure in the lines 27, 28 and 29 and thus also in the servomotor 7 due to the drive power output, which thus executes an actuating force and a corresponding actuating movement. The servomotor 7 is designed as a hydraulic cylinder, preferably as a single-acting hydraulic cylinder.

In the present example, the unit 8 is designed as a displacement pump or pneumatic compressor, which is actuated in rotation via the drive 10 . The compressor generates an air flow with which liquid or grainy or granular material 21 is discharged or expelled from the container 20 by means of a connecting line 18 by means of a discharge line 19 .

The material 21 can also be discharged by means of an ejector arranged below the container 20 or a dosing device, which is then connected to the connecting line 18 and the discharge line 19 . The material is discharged via the discharge line 19 behind the implement 1 distributed over a wide area or in rows by the distribution device 17 on the floor 22 or introduced into its surface. In this case, the drive 10 designed as a hydraulic motor has a return connection via which the hydraulic fluid from the pressure source 9 flows back through the line 31 almost without pressure from the pressure source 9 to the compressor through the line 31 into the return 25. The unit 8, which is driven by the drive 10 and is designed in particular as a displacement pump or compressor, creates a hydraulic pressure gradient across the drive 10, ie between lines 29 and 31. This pressure gradient can be between 50 and 250 bar, for example. The pressure gradient is sufficient to also apply pressure to the servomotor 7 in order to generate the necessary actuating force. Likewise, the drive 10 can be a hydraulic motor for driving a scraper floor, a conveyor belt, a screw conveyor or a similar continuous conveying device, with which material 21 is discharged from the container 20 at the bottom thereof.

A chassis 3 with a plurality of wheels 4 , 5 is fastened to the frame 2 in a rear area of the implement 1 and supports a large part of the weight of the implement 1 on the ground 22 . The weight of the implement, which is supported on the drawbar 26 and the towing vehicle 13, is negligible for the invention. Therefore, only the weight of the implement 1 resting on the chassis 3 is considered. For the functional description of a third sub-carriage 34, in particular an auxiliary axle 6, wheels 5.5' are off 2 , which in the side view would cover the wheels 4,4' and the third sub-carriage 34, in particular the auxiliary axle 6, are not shown for the sake of clarity.

The third sub-carriage 34 or the auxiliary axle 6 is pivotally connected to the frame 2 by means of an axle rocker 11 and is articulated to one end of the servomotor 7, preferably the piston rod of a hydraulic cylinder. The other end of the servomotor 7 is connected to the frame 2 in an articulated manner. Due to the change in length of the servomotor 7, which is caused by the pressure being applied by the pressure source 9 and/or the counter-pressure by the drive 10, the auxiliary axle 6 with its axle rocker 11 can be moved from an upper alternative position shown to a lower position and at the same time a part of the Weight of the working device 1 in a working position, while the pressure source 9 is switched on, by means of the wheels 4, 4' on the ground. In a transport position, at least part of the weight of the implement 1 can also be absorbed by the third sub-carriage 34 and its wheels 4, 4', and a first and second sub-carriage 32, 33 can thus be relieved up to a maximum permissible axle load.

Another part of the weight of the implement is permanently supported on the ground 22 by the wheels 5, 5' of a first and second sub-carriage 32, 33 of the chassis 3. In this position, the pivoting height h of the third sub-carriage 34 or the auxiliary axle 6 or the wheels 4, 4' is identical to the first and second sub-carriages 32, 33 or the brake axles 12 and their wheels 5, 5', i.e. h= 0. If the implement 1 hits an obstacle 23 protruding above the ground surface or a bump in the area of the third sub-carriage 34 or the auxiliary axle 6 and its wheels 4, 4', the third sub-carriage 34 can be moved by means of the axle rocker 11 against the actuating pressure of the servomotor 7 upwards and prevents instability or tipping of the implement 1. The hydraulic fluid displaced by the servomotor 7 can either escape through a safety device (not shown) of the pressure source 9 or via or through the drive 10 into the return 25. The evasive movement of the third sub-carriage 34 takes place at most by the illustrated swiveling height h upwards.

If the pressure source 9 is deactivated or depressurized, as is naturally the case in a transport position when driving on the road, the actuating force generated by the servomotor 7 falls on the third sub-carriage 34 . It therefore only lies loosely on the floor 22 with its own weight and does not carry any additional weight of the implement 1. Rather, the entire implement 1 is now carried by the wheels 5, 5', which are fixed in height to the frame 2 and which the in 2 are assigned to the first and second sub-carriages or the brake axles 12 as described below. Due to the almost full load of the implement weight on the brake axles 12, they can develop their full braking effect in the context of the implement weight. In the absence of the actuating force of the servomotor 7 on the third sub-carriage 34, this can also deviate upwards on uneven or hilly roads without negatively influencing the roll stability of the implement 1, as occurs with a continuously rigid implement 1 with tires across the entire width of the implement. In addition to depressurizing the servomotor 7, the servomotor 7 connected to the pressure source 9 can also be pressurized in a controlled manner, whereby the first and second sub-carriages 32, 33 and their wheels 5, 5' can be relieved in a controlled manner so that this legally permissible maximum Do not exceed axle loads. Here, the servomotor 7 can be connected, for example, to a pressure source 9 in the form of a pressure accumulator or the hydraulic system of the towing vehicle 13 .

2 shows the chassis 3 with a cross tube of the frame 2. On the frame 2, a first sub-carriage 32 and a second sub-carriage 33 in the form of brake axles 12 are fixed to the cross tube of the frame 2 on the outside. Alternatively, the first and second sub-carriages 32, 33 can also be arranged on the frame 2 so that they can be lifted out. The first and second partial chassis 32, 33 and the brake axles 12 have axle stubs 14, to which the wheels 5, 5' are attached by means of rotatable wheel hubs. The brake axles 12 are provided with commercially available drum brakes which, as shown, are actuated in a known manner by means of brake actuating cylinders and brake levers. The dimensions and braking decelerations of the brake axles 12 are dimensioned in such a way that they alone are able to brake the implement weight, which weighs on the chassis, in the manner required by law.

A third sub-carriage 34 in the form of an auxiliary axle 6 is arranged in a height-adjustable manner between the first and second sub-carriages 32, 33, as previously shown in 1 described. The height movement is represented by the arrow. Unlike the first and second sub-carriages 32, 33 or the brake axles 12, the third sub-carriage 34 or the auxiliary axle 6 is also provided with stub axles 14 and wheels 4, 4` rotatably attached thereto, but the stub axles 14 of the auxiliary axle 6, as shown, not via a brake hub, but only via unbraked rotatable running hubs.

The chassis 3 shown has a left and a right brake axle 12 and between them the central, unbraked auxiliary axle 6. Axle stubs 14 and the wheels 4, 4' and 5, 5' are arranged in pairs on all axles. The wheels 5, 5' of the first and second partial chassis 32, 33 are arranged on a first axis line 15 and a second axis line 16. The first and second axis line 15, 16 are seen in the direction of travel 24 spaced apart by an axis distance a. This axle distance a, which shows a displacement or offset of the axle stubs 14 or their axle centers 15, 16 per axle 12, 6 in the direction of travel 24, results from the rolling movement of the chassis 3 relative movement of the wheels 5, 4, 5 to the wheels 5', 4', 5'. Preferably, the wheelbase is at most the value of an outer wheel radius of the wheels 4, 5 and/or at least the amount of a wheel space between the wheels 5, 5' or 4, 4', which are assigned in pairs to a respective axle 12 or 6, but at a minimum about 50 mm or 2 inches / inch. As a result, any soil material, material to be spread or plant residues that is jammed between the wheels is already thrown off in the rear quadrant of the running gear 3 , viewed from the side of the direction of travel 24 . The chassis thus largely cleans itself.

The third part undercarriage 34 ( 3 ) has a third axle line 35 on which the wheels 4, 4' of the third sub-carriage 34 are arranged. The third axis line 35 is seen in the direction of travel 24 between the first and second axis line 15, 16, whereby a third axis is formed within the existing space. The additional third axle line 35 has the advantage that the permissible total weight of the implement 1 can be increased when driving on public roads.

Reference List

1

Agricultural implement

2

Frame

3

landing gear

4

wheel

5

wheel

6

auxiliary axis

7

actuator

8th

aggregate

9

pressure source

10

drive

11

swingarm

12

brake axle

13

towing vehicle

14

stub axle

15

First axis line

16

Second axis line

17

distribution facility

18

connection line

19

application line

20

container

21

spreading material

22

Floor

23

obstacle

24

driving direction

25

return

26

drawbar

27

Management

28

Management

29

Management

30

T connector

31

Management

H

swivel height

a

center distance

32

First part undercarriage

33

Second undercarriage

34

Third undercarriage

35

Third axis line

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• DE 102019120535 A1 [0003]

Claims (12)

Agricultural implement with a frame (2) and a chassis (3) arranged on the frame, the chassis (3) having at least a first partial chassis (32) and a second partial chassis (33) which essentially rotate in a direction of travel (24). are arranged side by side and each have at least one wheel (4, 5), wherein the at least one wheel (5) of the first sub-carriage (32) is on a first axis line (15) and the at least one wheel (5) of the second sub-carriage (33) is arranged on a second axis line (16), with the first axis line (15) and the second axis line (16) being arranged at an axis distance (a) from one another in the direction of travel (24) of the implement (1), with between the first and second At least one third sub-carriage (34) is arranged on the sub-carriage (32, 33), the third sub-carriage (34) having at least one third axle line (35) with at least one wheel (4) arranged thereon, and the height can be adjusted by means of a hydraulic servomotor (7). is arranged on the running gear (3), characterized in that the third partial running gear (34) is arranged in such a way that the third axis line (35), in particular in a working position and/or a transport position of the implement (1), between the first axis line (15) and the second axis line (16) is arranged. working device claim 1 , characterized in that at least one sub-carriage (32, 33, 34) is designed as a tandem axle with two wheels (4, 5), the wheels (4, 5) of the sub-carriage (32, 33, 34) being on the same or different axle lines (15, 16, 35) are arranged. working device claim 1 or 2 , characterized in that at least the wheels (5) of the first and second sub-carriage (32, 33) are assigned to a common or individual brake axle (12) and the at least one wheel (4) of the third sub-carriage (34) to a braked or unbraked axle Auxiliary axis (6) is assigned. Working device according to one of the preceding claims, characterized in that the working device (1) has at least one hydraulically driven unit (8) with a drive (10) which is connected to a hydraulic pressure source (9), both the drive (10) of the unit (8) and the servomotor (7) are directly fluidly connected to the same pressure source (9). Working device according to one of the preceding claims, characterized in that the drive (10) is connected next to the hydraulic pressure source (9) to a return line (25), in particular an unpressurized one. Working device according to one of the preceding claims, characterized in that the two outer wheels (5) of the first and second partial running gear (32, 33) are each connected to a further wheel (5') which is further inwards adjacent to one or one brake axle (12) assigned. Working device according to one of the preceding claims, characterized in that the sub-carriages (32, 33, 34), in particular the brake axles (12) and auxiliary axles (6), each have a pair of axle stubs (14) on which the respective wheels (4th , 4', 5, 5') are rotatably mounted, the axle stubs (14) arranged in pairs relative to one another, in particular of the first and second sub-carriages (32, 33), having a horizontal axle spacing (a) from one another in the direction of travel (24) of the working device ( 1) have. Working device according to one of the preceding claims, characterized in that adjacent to the first and second sub-carriages (32, 33), in particular the brake axles (12) of the working device (1), further braked or unbraked sub-carriages (32, 33, 34), in particular Auxiliary axles (6), with one or more wheels (4, 5) are pivotally or movably arranged, which extend from the first and second partial chassis (32, 33), in particular the brake axles (12), in the direction of a width of the working device (1st ) extend further outwards. Working device according to one of the preceding claims, characterized in that the further sub-carriages (32, 33, 34), in particular braked or unbraked auxiliary axles (6), which differ from the first and second sub-carriages (32, 33), in particular the brake axles (12 ), extending further outwards in the direction of the width of the implement (1), are connected to the implement (1) via an auxiliary frame that can be pivoted or tilted about pivot axes, the pivot axes in the direction of travel (24) or upright on the ground (22) are arranged. Working device according to one of the preceding claims, characterized in that in a working position of the working device (1), in particular when the unit (8) is in operation, a weight of the working device (1) is supported in approximately equal parts by the sub-carriages (32, 33, 34 ) and its wheels (4, 4', 5, 5'), and in a transport position of the implement (1), especially when the unit (8) is out of service, the weight of the implement (1) only from the first and second partial chassis (32, 33) and their Wheels (5, 5'), in particular the brake axles (12). Working device according to one of Claims 1 until 9 , characterized in that in a working position of the working device (1), in particular when the unit (8) is in operation, a weight of the working device (1) is borne in approximately equal parts by the sub-carriages (32, 33, 34) and their wheels (4th , 4', 5, 5') is carried, and in a transport position of the working device (1), in particular when the unit (8) is not in operation, the weight of the working device (1), which is carried by the first and second sub-carriage (32 , 33), in particular the brake axles (12), is limited to an adjustable maximum value, in particular a maximum value prescribed by law. Working device according to one of the preceding claims, characterized in that the hydraulic servomotor (7) is designed so that it can be subjected to an adjustable pressure.

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