The present invention relates to an inclined conveyor for a combine harvester, also simply known as a combine, pursuant to the introductory portion of claim 1.
Combines are equipped with an attachment that is provided with a reel for picking up the harvested material, and a transverse screw conveyor disposed behind the reel that compresses the harvested material and conveys it toward the center to an inclined conveyor, which is disposed in a channel member and conveys the harvested material into a threshing apparatus of the combine.
Inclined conveyors of the aforementioned general type are known, for example, from DE 17 73 257, DE 602 22 881 T2, DE 10 2005 027 841 A1 and DE 10 2004 036 183 A1. These inclined conveyors are provided with at most two endless pulling means that extend parallel to one another and that are guided about a lower pulling means guide and an upper pulling means guide, whereby the upper pulling means guide is driven. The pulling means are interconnected by cleats or coupling strips that are disposed transverse to the pulling means, whereby the coupling strips are secured to the pulling means by suitable securement means, for example bolts or rivets.
According to the state of the art, endless chains are used as pulling means. In the literature, e.g. DE 10 2004 036 183 A1, it is mentioned that instead of the conveying chains belts or cables could also be used as pulling means. However, to date such pulling means have not found their way into practice, probably because they do not have the long-term tensile strength required for inclined conveyors.
It is an object of the present invention to provide assistance in this respect, and to provide a belt that has an adequate long-term tensile strength for use in an inclined conveyor.
This object is inventively realized with an inclined conveyor having the features of claim 1.
Thus, pursuant to the present invention an endlessly wound toothed belt made of cross-linked polymer reinforced with woven fabric plies is used as the pulling means. The phrase “endlessly wound toothed belt” includes a belt that, for example in the case of the use of an elastomer, is produced in the following manner: a woven fabric strip that is rubberized on both sides is wound to form a package that essentially has the geometrical shape of the finished toothed belt. With this wound package, at least two woven fabric plies are disposed over one another, with the rubber layers disposed between them. A rubber layer is placed on the outside and on the inside of this wound package. This sandwich can then be placed into a molding or shape-providing vulcanization press, where it is vulcanized, whereby at the same time the teeth are formed out of the inwardly disposed rubber layer. It is to be understood that a high-strength woven fabric is utilized as the woven fabric. A toothed belt wound in this manner achieves the long-term tensile strength of its woven fabric plies, and can thus absorb the continuous tensile forces that are active when it is utilized in an inclined conveyor.
Further advantageous embodiments of the invention are apparent from the dependent claims.
The invention will be explained subsequently in greater detail with the aid of exemplary embodiments, where an endlessly wound toothed belt made of vulcanized rubber reinforced with woven fabric plies is utilized. In the accompanying drawing:
FIG. 1 is a schematic side view of a combine having a cutting unit and an inclined conveyor,
FIG. 2 is an isometric illustration of the inclined conveyor,
FIG. 3 is an enlarged illustration of the section A-A of FIG. 2,
FIG. 4 is an enlarged illustration of the section B-B of FIG. 2,
FIG. 5 is an enlarged illustration of the section A-A of FIG. 2 pursuant to a second exemplary embodiment of the invention,
FIG. 6 is an enlarged illustration of the section A-A of FIG. 2 pursuant to a third exemplary embodiment of the invention.
FIG. 1 shows an automatically operated combine 1. Below the driver's cab 2, an inclined conveyor 3 extends downwardly toward the front; at its front end, the inclined conveyor is equipped with a cutting or harvesting unit 4, which is comprised of a cutter bar 5, a reel 6 and a transverse screw conveyor 7. The cutting unit 4 is considerably wider than the combine 1 and customarily extends transversely beyond the front drive wheels 8 of the combine. The inclined conveyor 3 is narrower and generally has the width of the combine 1. The material that is to be harvested is cut off by the cutter bar 5, is picked up by the reel 6, and is fed to the transverse screw conveyor 7, which conveys and compacts the harvested material toward the center, and guides it to the inclined conveyor 3. The inclined conveyor 3 is disposed in a channel member 9, which has a cover wall 9.1, a bottom wall 9.2 and two side walls. The inclined conveyor 3 conveys the harvested material that is disposed on the bottom wall 9.2 of the channel member 9 to a non-illustrated thresher of the combine 1.
In FIG. 2, the inclined conveyor 3 is shown by itself. U has three toothed belts 10, which extend parallel to one another. These belts are guided about upper cam or gear wheels 11 and lower cam or gear wheels 12, which in the illustrated embodiment are embodied as welded structures. However, instead of a welded structure a cast structure is also possible. The upper gear wheels 11 are seated on a driven shaft 13, while the lower gear wheels 12, which are seated on a shaft 14, are carried along by the driven toothed or cogged belts 10. The gear wheels 11 and 12 are comprised of an axle disk that is fixedly connected with the shafts 13 and 14 respectively, and on the periphery of which cylindrical bolts or pins are welded so as to project perpendicularly. The pins are spaced from one another by a distance that corresponds to the spacing of the teeth 10.1 of the toothed belts 10. The pins 16 therefore engage in a positive or interlocking manner into the spaces or grooves 10.2 of the toothed belt 10 formed between the teeth 10.1. Each two adjacent toothed belts 10 are interconnected by spaced-apart cleats or coupling strips 17, whereby the coupling strips 17 of the respectively adjacent toothed belts 10 are spaced or staggered relative to one another.
In the embodiment illustrated in FIGS. 3, 4 and 6, the coupling strips 17 are secured to the toothed belt 10 via screw connections 18. These screw or bolt connections 18 are provided with screw bolts 19 that are vulcanized into the toothed belt 10 in the region of a tooth 10.1. This can be seen best from the illustration of FIG. 3. From this illustration, it can be seen that the head 19.1 of the screw bolt is embedded in the tooth 10.1, and the threaded shaft 19.2 extends through a hole 24 in the toothed belt 10 as well as a hole in the coupling strips 17. The securement of the coupling strips 17 on the toothed belt 10 is effected by threading a nut 20 onto the threaded shaft 19.2 of the screw bolt 19. In order to be able to absorb the tensile forces that thereby act upon the head 19.1 of the screw bolt 19 without damaging the toothed belt 10, the bolt head 19.1 rests on an anchor plate or plate washer 21 that with respect to surface area is larger.
As can be seen from the illustration in FIG. 4, the connection location between the toothed belt 10 and the coupling strips 17 is provided with two bolt connections 18.
It can be seen in particular from the illustration of FIG. 3 that the toothed belt 10 is provided with three fabric plies or layers 22 that are wound over one another and that are separated from one another by rubber layers. As already described above, these fabric plies 22 are wound endlessly, so that the toothed belt 10 has a high long-term tensile strength.
Inclined conveyors 3 that are equipped with the above-described toothed belt 10 have the advantage over inclined conveyors 3 that are conventionally equipped with chains that they are considerably more resistant to wear and noise, since at the guide or deflection locations there is no metal on metal contact.
FIG. 5 illustrates a further exemplary embodiment of the present invention. In contrast to the embodiment described above, here the securement locations of the coupling strips are not provided in the region of the teeth 10_11 but rather in the region of the grooves 102. Provided in the toothed belt 10 at the securement regions of the coupling strips 17 are holes 24 through which a rivet 23 respectively extends. In order to be able to absorb the tensile forces that occur during the production of the rivet connection, the rivet 23 is integrally connected with a plate washer 21, which corresponds to that of the previous embodiment. Instead of the rivet connection illustrated in FIG. 5, it is, of course, also possible to use a screw or bolt connection 18 as in the first embodiment.
A third exemplary embodiment of the present invention is illustrated in FIG. 6. This embodiment differs from the previously described embodiments in that bushings or sleeves 25 are inserted into the holes 24 of the toothed belt 10 through which the threaded shaft 19.2 of the screw bolts 19 extends, The length of the sleeves 25 in relation to the thickness of the toothed belt 10 in the securement region is measured such that a defined, process-reliable compression of the toothed belt 10 via the securement means 18 is ensured in the securement region, since when the ends of the sleeve 25 rest against the plate member 21 and the coupling strip 17 respectively, a further compression of the toothed belt 10 due to tightening of the nut 20 is not possible, at least at a normal application of force.
Patent Application
20120186949
