FR2751165A1 - Trailing haymaking machine with steered rear land-wheels - Google Patents

Abstract

The forward end of the lengthwise machine frame hinges via a vertical axis on the tractor, while the rear end is supported by one or more land wheels, the latter being steered by a thrust rod, bell-crank lever, track rod and steering arms coupled to the wheel stub shafts. On the track-rod halves (18,18') is a joint (25) moved sideways by a supporting lever (27). The arm (22) of the bell-crank lever (17) coupled to the track rod forms a linear guide (23) working with a slide (24) on the rod near the joint. As the steering angle increases, movement of the slide on the guide automatically increases the effective length of the bell-crank arm, giving a progressive steering effect by the land wheels.

Description

The invention relates to a haymaking machine comprising a carrying frame

  longitudinal semi-mounted, whose front end can be coupled to a tractor by means of a towing part which can pivot around a vertical connecting axis, and whose rear end is supported on the ground by the 'Intermediate of at least one articulated wheel, the deflection of the wheel (s) being carried out using a drawbar and push bar, coupled to the pivoting towing part, of a swivel bent lever, a tie rod (halves of a tie rod) as well as via hinged levers, which

  are coupled to the wheel trunnions.

  Haymaking machines having such an articulation device for the wheels of the longitudinal carrying frame of the machine are already known for example from European patent EP 0 316 896. In this known haymaking machine, a turning and / or a control of the haying machine coupled to the tractor is effected by means of a predetermined gear reduction so that, when moving in a curve, the wheels of the haymaking machine essentially follow the track of the tractor which pulls the haymaking machine. Since the lengths of the supporting frames of these haymaking machines increase more and more for larger working widths, there appear certain drawbacks in the fact that, for these long lengths of the carrying frames, after a pivoting operation with the at the end of the field, the rakes reach the previous working track only after a displacement of several meters, which leads to a

  Not very clean raking, at least in this starting area.

  The object of the present invention is to obtain, for haymaking machines having a long supporting frame, and this for permissible pivot radii at the end of the field, a better entry into the material to be raked and therefore d '' get a better rake job in the entry area after

  a pivot at the end of the field.

  This is achieved in accordance with the present invention by virtue of the fact that the coupling rod (the halves of the coupling rod) has a coupling articulation, which is guided so that it can be moved laterally by a pivoting support lever or by a slide and that the lever, which is coupled to the coupling bar, of the pivoting bent lever is arranged in the form of a linear guide, which cooperates with a slide articulated on the coupling bar in the area of the coupling joint so that, in the event that the turning angles increase, the length of the active lever arm of the bent lever, which attacks the coupling bar, increases automatically due to the translation of the slide in the linear guide lever, which has a

  progressive influence on the steering of the wheels.

  Thanks to the arrangement of the steering system conform-

  ment to the invention, there is advantageously obtained a progressive influence on the deflection or a progressive deflection of the wheels, which makes it possible to obtain, with respect to the deflection already known, because the deflection of deflection of the wheels increases more and more , faster alignment of the machine's longitudinal carrying frame

  and therefore rakes at the end of a pivoting operation.

  The machine's longitudinal supporting frame and therefore also the rakes are therefore aligned more quickly in the straight-ahead position, which makes it possible to obtain

  also a clean sweep already in the entrance area.

  Instead of the mechanical steering or steering transmission explained, one can of course also imagine a corresponding steering transmission using means

hydraulic.

  Other features and advantages of this

  invention will emerge from the description given below taken into account

  reference to the accompanying drawings, in which: - Figure i schematically shows, in a plan view, a large swather which is connected to a tractor and comprises a carrying frame which bears on the ground by means of steerable wheels; - Figure 2 shows a side elevational view of the steering lever device for the steerable wheels; and - Figure 3 shows the device with steering levers

  of Figure 2, in a plan view.

  Figure 1 shows, in a plan view, a haymaking machine 2, which is connected to a tractor 1 not shown in detail and comprises router rakes not shown in detail. The router rakes 3 and 4 are articulated by means of console arms 5 and 6 on a longitudinal median supporting frame 9 so as to be able to tilt upwards around axes 7 and 8 which are parallel to the ground and extend in the direction of travel. For its part, the longitudinal central carrying frame 9 is articulated, by its front end, by means of a pivoting towing part 10, to the two lower articulation levers 11, 12 of the tractor 1. At the rear end of the carrying frame longitudinal median 9 is fixed a transverse support 13, on the outer ends of which wheels 14, 15 are mounted so as to be orientable. The wheels 14, 15 are deflected from the pivoting towing part 10, by means of a pull and push bar 16, of an angled lever

  swivel or spreader 17, halves 18, 18 'of a tie rod

  as well as articulated levers 19, 19 'on the pins or

  axle stub 20, 20 'from wheels 14 and 15.

  An exemplary embodiment for the arrangement according to

  the invention of the steering system is shown in Figures 2 and 3.

  As shown in particular in Figure 2, the orientation movements of the pull and push bar 16 are transmitted to a first lever or arm 21 of the bent lever 17. The second lever or arm 22 of the bent lever 17 has a linear guide 23, on which a slide 24 is mounted so as to be movable. Slide 24

  for its part is coupled, in the area of its coupling articulation

  25, at the two halves 18, 18 'of the tie rod. The slide 24 and also the coupling articulation 25 are retained and guided by a support lever 27 which is mounted so as to be able to pivot in a bearing 26 on the longitudinal median carrying frame 9. In the embodiment shown, the bent lever 22 and the bearing 26 of the support lever 27 are arranged, from the slide 24, on the same side on the longitudinal median supporting frame 9, and in principle an arrangement on opposite sides is also possible. Instead of the support lever 27, it is of course also possible to use a slide guide at this point.

or the like, not shown.

  When the tractor 1 is turning, for example when it is turning at the end of a field, a displacement is then transmitted to the drawbar and push bar 16 under the effect of a pivoting of the towing piece 10, this displacement then causing an offset of the bent lever 17. During the displacement of the bent lever 17, its lever 22 is also displaced and therefore the slide 24 as well as the halves 18,

  18 'of the tie rod are also moved laterally.

  When the lever 22 is pivoted, the slider 24 is moved simultaneously in the longitudinal direction of the lever 22, on its linear guide 23, which causes a modification of the active length forming the lever arm 28 of the lever 22. As can be seen in the two positions shown of the lever 22 in accordance with Figure 3, when turning, there is an increase in the active length forming the lever arm 28, to a length 28 '. During turning movements, this has an influence

  progressive on the turning of the wheels 14, 15.

  Instead of the mechanical steering transmission shown and described, it is naturally also conceivable to use a corresponding steering transmission comprising

hydraulic means.

Claims (1)

CLAIM   Haymaking machine comprising a semi-carried longitudinal carrying chassis, the front end of which can be coupled to a tractor by means of a towing part which can pivot around a vertical connecting axis, and the rear end of which is supported on the ground by means of at least one articulated wheel, the deflection of the wheel (s) being carried out using a pull and push bar, coupled to the pivoting towing part, of a lever angled swivel, a tie rod (halves of a tie rod) as well as via articulated levers, which are coupled to the wheel studs, characterized in that the tie rod (the halves 18, 18 'of the coupling rod) has a coupling articulation (25), which is guided so that it can be moved laterally by a pivoting support lever (27) or by a slide and that the lever (22 ), which is coupled to the coupling bar (18,18 '), of the pivoting bent lever (17) is arranged in the form of a linear guide (23), which cooperates with a slide (24) articulated on the coupling bar (18 , 18 ') in the region of the coupling joint (25) so that, in the case where the turning angles increase, the length forming the active lever arm of the bent lever (17), which attacks the bar 'coupling (18,18'), increases automatically due to the translation of the slide (24) in the linear guide (23) of the lever (22), which has an influence   progressive on the steering of the wheels (14,15).