Abstract
The invention relates to a support bar (5) of a crop lifter (10) for harvested crops, having a main direction of extension (X). A portion (12) designed as a sliding skid is arranged between a first end (8) and a second end (9) of the support bar (5). The invention also relates to a crop lifter (10) for a cutter bar of a harvesting machine, comprising a stalk lifter and a support bar (5) carrying said stalk lifter.
Claims
1. Support bar of a crop lifter for crops, having a main extension direction, wherein between a first end and a second end of the support bar a portion formed as a skid is arranged, characterised in that the portion formed as a skid has at least portion-wise an undulated contour in a sectional view transversal to the main extension direction.
2. Support bar according to claim 1, characterised in that the portion formed as a skid is provided to be guided with an outer side over a ground, wherein at least two wave crests of the undulated contour project from the outer side.
3. Support bar according to claim 2, characterised in that the portion formed as a skid comprises lateral flanks, wherein the lateral flanks are angled to an inner side arranged opposite to the outer side.
4. Support bar according to claim 1, characterised in that the portion formed as a skid is formed mirror-symmetrically in a sectional view transversal to the main extension direction.
5. Support bar according to claim 1, characterised in that the undulated contour varies in shape along the main extension direction over a length of the portion formed as a skid, in particular the shape is tapering off from a central sector of the portion formed as a skid towards both directions.
6. Support bar according to claim 2, characterised in that a wear protection layer is deposited on the outer side.
7. Support bar according to claim 6, characterised in that the wear protection layer is deposited along a whole width of the contour.
8. Support bar according to claim 6, characterised in that the contour comprises, respectively, a wave trough between two neighbouring wave crests, wherein the wave trough is filled at least partially by the wear protection layers.
9. Support bar according to claim 8, characterised in that the wear protection layer is deposited flush in the wave trough.
10. Support bar according to claim 8, characterised in that the wear protection layer is deposited projecting beyond the wave crests.
11. Support bar according to claim 6, characterised in that a material of the wear protection layer is selected such, that a wear characteristic of the wear protection layer is comparable to a wear characteristic of the portion formed as a skid.
12. Support bar according to claim 6, characterised in that a material of the wear protection layer is selected such, that a hardness of the wear protection layer is comparable to a hardness of the portion formed as a skid.
13. Support bar according to claim 1, characterised in that the contour comprises, respectively, a wave trough between two neighbouring wave crests, wherein at least one blocking burling is arranged for accumulating material of the ground in each wave trough.
14. Support bar according to claim 1, characterised in that the contour has exactly one wave trough between two wave crests, wherein a height of the two wave crests is equal relative to the wave trough.
15. Crop lifter for a mower of a harvesting machine, having a stalk lifter and a support bar supporting the stalk lifter according to claim 1.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Followingly, the invention is described in detail by means of exemplary embodiments, referring to the attached drawings. The remarks are only exemplary and do not limit the general idea of the invention.
[0023] It shows
[0024] FIG. 1 a crop lifter with a support bar according to the state of the art, on a mower of a harvesting machine,
[0025] FIGS. 2a and 2b two views of a support bar according to the state of the art respectively in a sectional view,
[0026] FIGS. 3 and 4 two views of an embodiment of a support bar according to the invention,
[0027] FIGS. 5a to 5e five views, respectively in a sectional view transversal to the main extension direction of the support bar corresponding to the intersection lines of FIG. 4,
[0028] FIGS. 6a, 6b and 6c a wear of the support bar according to the invention of FIGS. 3 and 4,
[0029] FIGS. 7a, 7b and 7c a wear of the support bar according to the state of the art of FIGS. 2a and 2b,
[0030] FIGS. 8a and 8b two views of a further embodiment of the support bar according to the invention respectively in a sectional view,
[0031] FIGS. 9a to 9d four further embodiments of the support bar according to the invention of FIG. 8b, respectively in a sectional view transversally to the main extension direction,
[0032] FIGS. 10a to 10c three views of a further embodiment of the support bar according to the invention respectively in a sectional view,
[0033] FIG. 11 a further embodiment of the support bar according to the invention in a sectional view.
DETAILED DESCRIPTION OF THE INVENTION
[0034] In FIG. 1 an embodiment of a crop lifter with a support bar 5 according to the state of the art is shown. A sickle bar 1 is shown in a schematical representation, from which a mowing finger 2 is shown projectingly. This is attached by means of a screw 3 on the sickle bar 1. Several further mowing fingers 2 are assigned to the sickle bar 1 with distance to each other into the drawing plane and out of the drawing plane. The mowing fingers 2 serve for guiding a cutter bar 4, which comprises mowing blades for separating the crops. The mowing finger 2 is arranged inclined with lowered cutting table at an angle of approximately 18 with its tip to the ground 6, so that it can be cut as low as possible, without having to lower the cutting table so far, that the cutting unit tray 7 abuts the ground 6. A first end 8 of the support bar 5, manufactured from a flat material as initial material, is for example attachable via a yoke-like means with a disc, having an annular groove, which is attached via the screw 3, on the sickle bar 1. On a second end 9, distanced from the first end 8, a stalk lifter 10, which extends at an angle to the support bar inclined upwards in direction to the sickle bar 1, is mounted on the support bar 5. The support bar 5 is supported by means of a holder 11 on the mowing finger 2 or its upper face facing away from the support bar 5.
[0035] FIGS. 2a and 2b show two views of a support bar 5 according to the state of the art, respectively in a sectional view, wherein the support bar 5 is largely comparable to that of FIG. 1. FIG. 2a shows the support bar 5 in a sectional view along the main extension direction from the first end 8 to the second end 9. An outer side 15 is facing the ground 6 during operation of a harvesting machine. The portion 12 of the support bar 5, formed as a skid, is provided to glide over the ground 6 and is correspondingly subjected to a significant wear. FIG. 2b shows a sectional view B-B of FIG. 2a, transversally to the main extension direction through the portion 12 formed as a skid. Therein is the, seen from an inner side 18 of the support bar 5, simple concave bulge recognizable in the area of the skid 12, by means of which an angle V is formed between the flanks 17 of the skid and the ground 6.
[0036] FIGS. 3 and 4 show respectively views of a first embodiment of a support bar 5 according to the invention, which is shown in the following respectively without stalk lifter, attachment elements or cutter unit. The configuration of the crop lifter shown in FIG. 1 is only exemplary. The arrangement of the support bar 5 to the stalk lifter or the cutter unit can deviate therefrom. The support bar 5 according to the invention comprises a first end 8 and a second end 9. The support bar 5 extends between the first end 8 and the second end 9 along a main extension direction or longitudinal axis X and comprises a portion 12, formed as a skid and which also for simplification is only designated as skid 12.
[0037] In FIGS. 5a to 5e it is visible, that the support bar 5 has in the area of the skid 12, when seen in different sectional views transversally to the main extension direction X, extending at a right angle to the drawing plane, respectively an undulated contour. The shown embodiment of the support bar 5 comprises two wave crests 14 on an outer side 15 of the support bar 5. The outer side 15 is the side facing the ground 6 during operation. FIGS. 5a to 5e show five, consecutive sectional views of the skid 12 in approximately constant distances, starting close to the front end 9. Thus, it is illustrated, that the undulated contour along the main extension direction X along the length of the portion 12 formed as a skid, varies in its shape.
[0038] FIG. 5a shows a sectional view along the intersection line A-A of FIG. 4. The undulated contour, comprising the wave crests 14 and the wave trough 16 arranged therebetween, is here at the front edge of the skid 12 facing the second end 9, only slightly shaped.
[0039] FIG. 5b shows a sectional view along the intersection line B-B of FIG. 4. The undulated contour, comprising the wave crests 14 and the wave trough 16 arranged therebetween, is here between the edge and the centre of the skid 12, formed more distinctly, than in FIG. 5a.
[0040] FIG. 5c shows a sectional view along the intersection line C-C of FIG. 4. The undulated contour comprising the wave crests 14 and the wave trough 16 arranged therebetween, is here approximately in the centre of the skid 12, formed most distinctly.
[0041] FIG. 5d shows a sectional view along the intersection line D-D of FIG. 4. The undulated contour, comprising the wave crests 14 and the wave trough 16 arranged therebetween is here between the centre and the edge of the skid 12, formed slightly less distinctly, than in FIG. 5c.
[0042] FIG. 5e shows a sectional view along the intersection line E-E of FIG. 4. The undulated contour, comprising the wave crests 14 and the wave trough 16 arranged therebetween, is here at the rear edge of the skid 12, distanced from the second end 9, formed much less pronounced than in the centre.
[0043] FIGS. 5a to 5e show, that the undulated contour varies along a length of the portion formed as a skid 12 in its shape, wherein the shape of the contour decreases starting from a central sector (FIG. 5c) of the portion formed as a skid 12 in both directions. Preferably, the contour has exactly one wave trough 16 between exactly two wave crests 14, wherein the height of the two wave crests 14 is respectively the same in relation to the wave trough 16.
[0044] FIGS. 6a to 6c and 7a to 7c serve for the representation of the wear characteristics at the support bar 5 according to the invention of FIGS. 3 and 4 in comparison to the support bar according to the state of the art of FIGS. 2a and 2b. The wear is graphically represented qualitatively in form of elongated slots 20 and holes 21, wherein the graphic representations of the wear are based on actual wear experiments with the different support bars 5 under comparable conditions.
[0045] FIGS. 6a, 6b and 6c show the support bar 5 according to the invention, wherein in the view of FIG. 6a in the area of the skid 12, elongated slots 20 are visible as wear characteristics. The elongated slots 20 are shown enlarged in the detail A in FIG. 6c. FIG. 6b shows the skid 5 in a sectional view C-C through the skid 12 transversally to the main extension direction X, in which the slots 20 are visibly arranged in the area of the wave crests 14 of the undulated contour according to the invention, wherein the wave crests 14 and the wave trough 16 are only rudimentary visible because of the advanced wear in FIG. 6b.
[0046] FIGS. 7a, 7b and 7c show the support bar 5 according to the state of the art, wherein in the view of FIG. 7a in the area of the skid 12, wear is visible. In contrast to the elongated slots 20 in detail A of FIG. 6c, a continuous, essentially wider wear portion 21, which for the differentiation is, in this case, designated as a hole 21, is visible in detail B of FIG. 7c. FIG. 7b shows the support bar 5 in a sectional view D-D through the skid 12, transversally to the main extension direction X, in which the hole 21 is formed visibly approximately centred in the apex portion of the simple bulging of the skid 12. Especially, the comparison of the detailed views A of FIG. 6c and B of FIG. 7c shows, that the support bar 5 has in the area of the skid 12 with the undulated contour according to the invention a higher stability, as the two elongated slots 20 act less destabilising than the hole 21, especially as the latter extends across an essentially larger portion of the width transversally to the main extension direction X, than the two elongated slots 20 together.
[0047] FIGS. 8a and 8b show a further embodiment of the support bar 5 according to the invention, which differs from the embodiment of FIG. 3 initially essentially because of the flatter extension in the area of the first end 8. FIG. 8a shows a sectional view through the skid 12 transversally to the main extension direction X corresponding to the intersection line A-A of FIG. 8a. The undulated contour according to the invention comprising two wave crests 14 and one wave trough 16 at the outer side 15, has in this embodiment a further difference to the state of the art, which is especially visible when comparing FIGS. 8b and 2b. The flanks 17 of the undulated contour in the area of the skid 12 are in the embodiment of FIG. 8b stronger inclined in direction to the inner side 18 than in the simple concave bulged contour according to the state of the art of FIG. 2b. The angle W between the ground 6 and the flank 17 is thus larger than the angle V in the simple concavely bulged contour, which generally is approximately 25 degrees. In the undulated contour according to the invention the angle W is preferably at least 30 degrees and up to 90 degrees. The steeper flanks 17 allow a better displacement of ground material and furthermore contribute to the bending stiffness in the main extension direction and to the torsional stiffness of the support bar 5.
[0048] In FIGS. 9a to 9d four further embodiments of the support bar 5 are shown. Only one sectional view through the skid 12, transversally to the main extension direction X, which in this case is arranged at a right angle to the drawing plane, is shown. The embodiments of FIGS. 9a to 9d have in common, that a wear protection layer 19 is deposited on the outer side 15 of the skid 12.
[0049] According the support bar 5 of FIG. 9a the wear protection layer 19 is deposited across the whole width of the undulated contour. According to the support bar 5 of FIG. 9b it is provided, that the wear protection layer 19 is deposited projecting beyond the wave crests 14.
[0050] In the support bar 5 of FIG. 9c, the wear protection layer 19 is not deposited across the whole width of the undulated contour, but only the wave trough is filled by the wear protection layer 19. Expressed more precisely, the wear protection layer 19 is filled flush with the wave crests 14 into the wave trough 16. In the support bar 5 of FIG. 9b it is again provided, that only the wave trough 16 is filled with the wear protection layer 19, in this case, however, this is deposited projecting beyond the wave crests 14.
[0051] A further embodiment of the support bar 5 is shown in FIGS. 10a, 10b and 10c. FIG. 10a shows a sectional view longitudinally to the main extension direction X, FIG. 10c shows an enlarged sectional view transversally thereto, corresponding to the intersection line A-A. FIG. 10b shows enlarged the detail B of FIG. 10a. The embodiment has an undulated contour of the skid comprising two wave crests 14 on the outer side 15. In the wave trough 16, two obstacles, designated as blocking burlings 22, are arranged and which ensure during operation, that the ground material is accumulated in the wave trough 16, which acts as a wear protection for the skid 12. The blocking burlings 22 can, for example, be welding spots, which are arranged in the wave trough 16.
[0052] In FIG. 11 a further embodiment of the support bar according to the invention is shown in a sectional view, wherein the representation is comparable to the embodiment shown in FIG. 8b. The embodiment of FIG. 11 illustrates, that the portion 12 formed as a skid can have in the sectional view transversally to the main extension direction an undulated contour comprising more than two wave crests 14. In the shown embodiment, the contour of FIG. 8b is arranged turned by 180 degrees in principle, so that additionally to a middle wave crest 14 also two wave crests 14 at the flanks 17 are facing the ground 6. Correspondingly two wave troughs 16 are arranged between the wave crests 14. Alternatively, one or both flanks 17 can be bent again upwards away from the ground 6.
REFERENCE NUMERALS LIST
[0053] 1 sickle bar
[0054] 2 mowing finger
[0055] 3 screw
[0056] 4 cutter bar
[0057] 5 support bar
[0058] 6 ground
[0059] 7 cutting unit tray
[0060] 8 first end of the support bar
[0061] 9 second end of the support bar
[0062] 10 stalk lifter
[0063] 11 holder
[0064] 12 skid
[0065] 14 wave crest
[0066] 15 outer side
[0067] 16 wave trough
[0068] 17 flank
[0069] 18 inner side
[0070] 19 wear protection layer
[0071] 20 gap
[0072] 21 hole
[0073] 22 blocking burling
[0074] V, W angle
[0075] X main extension direction, longitudinal axis
