Abstract
The invention relates to an agricultural implement having an auxiliary chassis, which implement is supported by the three-point hydraulics of a towing vehicle and has an additional support wheel, on which a spring force acts, to improve the steerability of the vehicle. A dead center mechanism resiliently lifts the support wheel when the implement is in the working position.
Claims
1. The invention relates to an agricultural implement (1), in particular a ground working implement, comprising a frame (2) for receiving working tools (3) and a trailer tower (4) on one side of the working implement (1) for attaching the working implement to a vehicle (5), and an auxiliary chassis (6) arranged on the other side of the implement (1) with at least one wheel arm (7) and a wheel (8) rotatably fastened thereto, wherein the wheel arm (7) is movable vertically with respect to the working implement (1) via at least one linkage (9, 13), wherein at least one energy accumulator (10) is arranged movably between the frame (2) and the wheel arm (7) with a respective counter bearing (11, 12), wherein the counter bearings (11, 12) are arranged on a straight line (g) characterized in that the linkage (9, 13) is arranged in a lowered position of the wheel arm (2) on a first side (a) at a distance along the straight line (g) and in a raised position of the wheel arm (2) is arranged at a distance (b) along the straight line (g).
2. Agricultural implement according to claim 1, characterized in that the resulting effective line of one or more energy accumulators is approximately on the straight line (g) which runs through the counter bearings (11, 12).
3. Agricultural implement according to claim 1, characterized in that the wheel arm is movably connected to the frame via a first linkage (13) and is connected to the energy accumulator (10) via a second linkage (9) and a deflection device (15).
4. Agricultural implement according to claim 1, characterized in that the pre-loading of the energy accumulator is adjustable.
5. Agricultural implement according to claim 1, characterized in that the energy accumulator is designed as a one-part or multi-part spring assembly.
6. Agricultural implement according claim 1, characterized in that the energy accumulator is designed as a fluid reservoir with a pressure accumulator connected thereto.
7. Agricultural implement according to claim 1, characterized in that a further auxiliary device (27, 28) is provided, which is designed or supported by an external force to move the at least one counter bearing (11, 12) from a first position into a second position.
8. Agricultural implement according to claim 1, characterized in that the auxiliary device (27, 28) is designed to cooperate with the lifting device of the towing vehicle to displace the position of at least one counter bearing (11, 12).
9. Agricultural implement according to claim 1, characterized in that the auxiliary chassis (6) is also designed as a function of a rear device for consolidation of the ground being worked.
10. Agricultural implement according to claim 1, characterized in that the frame (2) of the agricultural implement is designed as a multi-part folding or pivoting frame.
Description
[0017] Further details and advantages of the subject matter of the invention are given in the following description and the accompanying drawings in which an exemplary embodiment with the necessary details is shown:
[0018] FIG. 1 shows a side view of a vehicle with attached ground working implement in the raised position;
[0019] FIG. 2 shows the side view of a vehicle with a ground working implement in the working position,
[0020] FIG. 3 shows a detailed view of FIG. 2; and
[0021] FIG. 4 shows a detailed view of FIG. 1.
[0022] FIG. 1 schematically shows the rear part of a vehicle 5 which carries an agricultural working implement 1. The agricultural working implement 1 is connected to the towing vehicle 5 via a lifting device, consisting of an upper linkage 20 as well as two lower linkages 21, also known as three-point linkages. The upper linkage 20 as well as the lower linkages 21 are thereby movably coupled at the respective fastening points of the trailer tower 4 or of the frame 2. The frame 2 adjoining the trailer tower 4 extends to the rear as well as to the side of the implement center and carries the working tools 3, 3′, which are arranged, for example, as two rows of concave disks next to one another and offset relative to one another on the frame. Various arrangements of tine bars or other tools, also in combination, are also possible. A depth guidance device 18 in the form of a tandem roller is mounted on the frame 2 in a height-adjustable manner behind the working tools 3, 3′ and serves for the depth guidance of the working tool 1 or else for the leveling or re-consolidation of the soil material raised by the working tools 3, 3′. A linkage 13, the linkage axis of which preferably extends transversely to the direction of travel, connects the wheel arm 7 in a height-adjustable manner to the frame 2 of the agricultural implement 1. A wheel is pivotally mounted at the other end of the wheel arm 7 to rotate about the axis 19, and form, together with the wheel arm 7, the auxiliary chassis 6, which supports a part of the weight of the implement 1 on the ground 22. The other part of the weight of the implement 1 is supported at the front of the towing vehicle 5 via the lifting device, consisting of upper and lower linkages 20, 21. A strut 14 is movably connected to the wheel arm 7 via a linkage 17. The other end of the strut 14 is coupled to the deflection device 15 with a further linkage 16. The deflection device 15 is, in turn, movably connected to the strut 23 via the linkage 9 and thus at least indirectly to the frame 2. The strut 23 thereby forms part of the frame 2 and is guided in the upper region by the trailer tower 4. A counter bearing 11 for the energy accumulator 10 is arranged on the strut 23, as is a further counter bearing 12 at the lower end of the deflection device 15. The energy accumulator 10, in this case a compression spring, is pre-loaded and acts in the direction of the straight line g, which runs through the center point of the counter bearings 11 and 12 with which the effective lever spacing a transmits a torque about the linkage 9 to the deflection device 15, which applies a pressure force to the strut 14 via the linkage 16 and presses the wheel arm 7, and thus the auxiliary chassis 6, against the ground 22. Thus, the agricultural implement 1 is relieved of the amount of the wheel loading of the auxiliary chassis 6 and requires a lower lifting force from the towing vehicle 5. During travel over ground irregularities, a large part of the movements of the auxiliary chassis 6 occurring therewith, is movably compensated via the described mechanism and the energy accumulator. The front attachment tower is connected to the frame to pivot about one or more pivot points 24. An elongated hole connects the upper part of the trailer tower to the strut 23 via a transverse bolt and prevents the implement 1 from falling down due to its own weight. In this case, a further transverse bolt engages in a cam or a hook nose of the deflection device 15 and, in the lifted state of the implement 1, prevents the deflection device from pivoting through a dead center into the upper position which would result in the lifting of the auxiliary chassis from the ground 22.
[0023] FIG. 2 shows the same situation as FIG. 1, but with a lowered implement 1 in the working position. At the same time, the working tools 3, 3′ cut into the ground 22 and the implement weight is supported on the ground by the depth guidance device 18. This creates a pressure force in the upper linkage 20, which pushes the trailer tower backwards in the previously described elongated hole. By this movement of the trailer tower, the cam or the nose of the deflection device 15 is released. The deflection device 15 pivots about the linkage 9 against the force of the energy accumulator 10 via a dead center through the support load generated on lowering the device 1 on the auxiliary chassis and thus on the wheel arm 7 and applies the pressure force produced thereby to the strut 14. Upon rotation of the deflection device 15, the counter bearing 12 is shifted, and thus the straight line g extending through the counter bearings 11 and 12 is shifted by the distance b to the other side, namely above the point of linkage 9. The again pre-loaded energy accumulator now generates a torque of the deflection device 15 about the linkage 9 in the direction of the straight line g with the effective lever spacing b, in the opposite direction to that described in FIG. 1.
As a result, a tensile force is transmitted via the linkage 16 to the strut 14, which lifts the wheel arm 7 and thus lifts the entire auxiliary chassis 6 from the ground against its own weight about the linkage 13. Thus, the auxiliary chassis 6 or the wheel 8 leaves no, or at least no deep, tracks in the worked ground 22.
[0024] FIG. 3 shows a detailed section of the working implement 1 from FIG. 2, with some components in a concealed manner and shown by dashed lines in order to facilitate understanding. The implement 1 is located on the ground in the working position and is supported by the rear depth guidance device (not shown). By means of the articulated suspension of the implement 1 at the upper linkage 20 and the lower linkages 21, a compressive force acts on the trailer tower 4 through the upper linkage 20, as a result of which the latter pivots backwards about the pivot point 24 relative to the linkage 9 of the deflection device 15 or the strut 23. The brackets 26, which are provided with an elongated hole 25, are welded or screwed to the trailer tower 4 and limit the above-described pivotal movement of the trailer tower 4 so that the linkage bolt of the linkage 9 protrudes through the elongated hole 25, and, in addition, rotatably supports the deflection device 15 lying between the brackets 26, and connects it to the struts 23 lying outside the brackets 26. The linkage bolt of the linkage 9 is located at the front end of the elongated hole 25 and delimits the pivoting range of the coupling tower 4 or of the brackets 26 attached thereto. The wheel arm (not shown) is supported on the ground and exerts a compressive force via the strut 14 and the linkage 16 on the deflection device 15.
As a result, the energy accumulator 10 is compressed and moved through the dead center into the illustrated upper position, which is represented by the distance b from the linkage 9 along the straight line g. As already described in FIG. 2, the force from the energy accumulator is sufficient to lift the wheel arm and the wheel above the ground, and thus the auxiliary chassis against its own weight by means of the deflection device 15 and strut 14, to such an extent that no, or at least no deep, tracks are left by the wheel in the ground. In this case, a stop 27 which is fastened between the two brackets 26 limits the movement of the deflection device 15, wherein a cam 28 of the deflection device 15 designed as a hook nose, abuts the stop 27. The stop 27 is designed as an eccentric hexagonal bolt in order to keep a sufficient ground clearance of the wheel arm above the ground. Further adjustment possibilities within the kinematic system are likewise conceivable, as for example spindles, perforated strips, etc.
[0025] FIG. 4 shows the same arrangement as FIG. 3, but in the lifted position of the working implement 1 according to FIG. 1. By the lifting force or lifting movement of the lower linkage 21 acting on the front part of the implement 1, the latter falls under its own weight and produces a tensile force in the upper linkage 20. As a result, the trailer tower 4 pivots forward with its brackets 26 and the stop 27 about the pivot point 24. The stop presses against the cam 28 of the deflection device 15 and moves it around the linkage 9. As a result, the pivot point 12 is displaced downwards until the energy accumulator 10 attached thereto passes through its dead center position and with the now emerging lever arm with a distance a between the linkage 9 along the straight line g generates a torque about the axis of the linkage 9 and generates a compressive force via the linkage 16 in the direction of the strut 14, which acts on the wheel arm (not shown). Since the elongated holes 25 of the brackets 26 are butt against the bolts of the linkage, the implement 1 is lifted by the upper linkage 20 and the lower linkage 21, as is also shown in FIG. 1. However, a part of the implement weight is supported on the ground via the wheel arm and the wheel and thus the lifting device of the towing vehicle is partially relieved during the lifting movement or at least in its upper position.
LIST OF REFERENCE NUMERALS
[0026] 1 Agricultural working implement
[0027] 2 Frames
[0028] 3 Working tool
[0029] 4 Trailer tower
[0030] 5 Vehicle
[0031] 6 Auxiliary chassis
[0032] 7 Wheel arm
[0033] 8 Wheel
[0034] 9 Linkage
[0035] 10 Energy accumulator
[0036] 11 Counter bearing
[0037] 12 Counter bearing
[0038] 13 Linkage
[0039] 14 Strut
[0040] 15 Deflection device
[0041] 16 Linkage
[0042] 17 Linkage
[0043] 18 Depth guide
[0044] 19 Axis
[0045] 20 Upper linkage
[0046] 21 Lower linkage
[0047] 22 Ground
[0048] 23 Strut
[0049] 24 Pivot point
[0050] 25 Elongated hole
[0051] 26 Bracket
[0052] 27 Stop
[0053] 28 Cams
