DE1147434B - Attachment for tractor, with hydraulic drive - Google Patents

Description

With the introduction of tractors, mounted mowers that are carried by the tractor have established themselves and where the cutting unit is usually on the right between the front and rear wheels.

Up to now, it has been driven mechanically by means of gears, V-belts and the like from the tractor unit or from the tractor engine. These systems are satisfactory in themselves, but they cause am Structural measures for tractors that take up a lot of space and generate costs. Weighs heavily that these precautions must usually be attached to all tractors as standard, too for those who are not later equipped with mowers. This increases the costs per mower unit Farther. For these reasons hydraulic mower drives have been developed. A simple pipe or hose line from the hydraulic pump to the hydraulic mower motor is sufficient for power transmission, and the laying of such lines is easy.

Various designs of such mower drives are already known. But they all have Disadvantage.

One embodiment has a cylinder in which a piston reciprocates from the hydraulic system will. This piston is directly connected to the knife by a push rod. This plant can only be installed in the inner shoe, and it is clear that this is then very wide. However, an increase in the inner shoe width beyond a certain amount brings significant mowing technology Difficulties in that the inner shoe no longer finds space in the cleared lane and therefore mowed grass is pushed along or uncut grass is run over.

It has also been shown that the frequency that can be achieved with the hydraulic system is too low and therefore mowers of this type only achieve moderate mowing performance.

In another arrangement, a hydraulic motor drives a slide via a crank disk, which in turn is directly connected to the knife.

The same disadvantages result here as in the case of the hydraulically moved piston with respect to the required large overall width. In addition, this unit is very difficult to build, so that the mower puts too heavy a load on the ground with the inner shoe and pushes the earth with it.

Attempts have also been made to mount a hydraulically driven crankshaft close to the inner shoe. The mower knife is used in the attachment mower for tractors,
with hydraulic drive

Applicant:
Karl Mörtl, Gemünden / M., Am Neuberg 10

Karl Mörtl, Gemünden / M.,
has been named as the inventor

set in motion from this shaft in the usual way by means of a connecting rod. These too The arrangement in turn has the disadvantages of the previously described and also very steep crank angle of incidence.

Another arrangement that has become known has a vertical mowing shaft permanently mounted on the tractor, arranged on the side of the tractor opposite the mower, driven by a Hydraulic motor. This arrangement takes up a lot of spatial space, namely at the point that is mainly used for fastening the front loader or is required for it. When dismantling the Mower, the hydraulically driven mowing shaft must be removed by a special assembly. But it is particularly important that this vertical mowing shaft does not change constantly Can adjust the position of the mower crank and therefore attacks it at different angles. A very complicated universal joint on the connecting rod is necessary.

The same disadvantages are exhibited by a mechanical mower drive with a vertical mower that is permanently mounted on the vehicle Mowing shaft on.

The ₁ inventive arrangement avoids these disadvantages.

Fig. 1 shows a top view of a tractor with the tractor mower according to the invention;

Fig. 2 shows a section through the tractor and the tractor mower in the space of the connecting rod.

The mowing shaft 5 with the hydraulic motor 1 is built on the support rods 2, 8 of the cutting unit 3, namely on the side of the tractor 6, the

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the cutting unit 3, seen in the direction of travel, is opposite.

The mowing shaft 5 is placed in such a way that, viewed in the direction of travel, it lies at right angles to the plane in which the connecting rod 4 moves and, viewed transversely to the direction of travel, approximately perpendicular in space. As a result of the structure on the support rod 2, 8 in the manner described, the shaft 5 makes the same pivoting movements as the support rod 2, 8, and the connecting rod 4 therefore always engages the crank bearing 9 uniformly at right angles. Because the connecting rod 4 circles approximately horizontally, the height deflection is omitted as with the previously customary horizontally lying mowing shafts, and the ground clearance under the mower crank 7 is narrowed by the height of the crank deflection. The fact that the shaft 5 with the hydraulic motor 1 is arranged on the side of the tractor 6 facing away from the cutting mechanism 3 results in a long connecting rod 4 with a shallow angle of incidence. This is of particular importance for the rough, practical mowing use on farms.

If you now order the shaft 5 of the hydraulic drive motor 1 perpendicular to the plane the connecting rod 4, it is also important that the support strut 2 and the expansion strut 8 for the Cutting unit 3 are placed in the area of the lowest points of the tractor 6 so that they approach the connecting rod 4 to the point in question of the tractor body 6 when lifting of the cutting unit 3 in the transport position.

If the tractor body 6 is completely straight at the bottom, the struts 2 and 8 must be at the same height as the connecting rod 4.If they are of the same thickness as this, they no longer restrict the ground clearance as the connecting rod 4.

If the lower contour of the tractor 6 runs in a wavy or interrupted contour and if it releases different heights above the struts 2 and 8 and above the connecting rod 4, you can use the Select the same height arrangement as mentioned above. But advantages can also be seen in that one puts the struts 2 and 8 and the connecting rod 4 each as high as it is the lower contour of the Tractor 6 permitted at the relevant point.

Claims (3)

PATENT CLAIMS: 1. Hydraulically driven tractor mower, the hydraulic motor and its cutting unit are carried by a support linkage, characterized in that the cutting unit (3) on one side and the hydraulic motor (1) are on the other side of the tractor body (6), the Hydraulic motor (1) is arranged on the support strut (2) so that the shaft (5) of the hydraulic motor (1) always remains approximately perpendicular to the plane in which the mower crank rod (4) moves during operation. 2. Hydraulically driven tractor mower according to claim 1, characterized in that that the support strut (2) and the expansion strut (8) are at the same height as the mower crank rod (4) lie. 3. Hydraulically driven tractor mower according to claim 1 or 2, characterized in that that the mower crank rod (4) and the support strut (2) and the expansion strut (8) so high are placed as the lower contour of the tractor (6) allows, but at least so that the The mower crank bar (4) does not lie lower than one of the two struts (2, 8). Documents considered: German Patent No. 971491; U.S. Patent Nos. 1,386,874, 2,686,998. 1 sheet of drawings © 309 550/50 4.63