Traction element comprising claw-like traction projections

Abstract

The invention relates to a traction element (1) for a chain mesh (72) of a tyre chain for a land vehicle, the traction element comprising: at least two traction projections (2) which are arranged on a longitudinal side (4) of the traction element and each extend in a longitudinal direction (14); and a central plane (8) which extends through the longitudinal side and a longitudinal axis (10) of the traction element, wherein the longitudinal directions of the at least two traction projections each extend parallel to the central plane of the traction element. The invention also relates to a chain mesh comprising such traction elements and to a tyre chain comprising such a chain mesh. The aforementioned features provide a particularly substantial increase in the traction of a tyre chain.

Description

[0001] Traction element with claw-like arranged traction projections

[0002] The present invention relates to a traction element for a running net for a tire track for a land vehicle, and to a running net with such traction elements. The invention further relates to a tire track with such a running net.

[0003] Tire chains, such as traction devices or tire protection chains, are typically fitted to a vehicle wheel to improve traction on slippery surfaces like snow, ice, or mud, and / or to protect the vehicle's tire. The track of such a tire chain rests on the tread of the vehicle's tire. Tire chains often feature traction links designed to dig into the surface. The improvement in traction depends significantly on how well these traction links dig into the ground. At the same time, tire chains should be as robust as possible to counteract a loss of traction.

[0004] The present invention is therefore based on the objective of providing means for a tire chain that significantly increase traction while also being robust.

[0005] This problem is solved by a traction element for a running network for a tire chain for a land vehicle, with at least two traction projections arranged on a longitudinal side of the traction element, each extending in a longitudinal direction, with a median plane extending through the longitudinal side and a longitudinal axis of the traction element, wherein the longitudinal directions of the at least two traction projections each extend parallel to the median plane of the traction element.

[0006] The unique arrangement of the traction projections, which ensures their longitudinal orientation is parallel to the central plane of the traction link, allows the projections to dig particularly well into the ground when the traction link is used in a tire track, thus significantly improving the traction of the vehicle tire fitted with the track. At the same time, the parallel arrangement of the traction projections makes the traction link more robust, particularly by preventing the breakage of any of the projections. This results in a particularly reliable and durable traction link.

[0007] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw The above invention can be further improved by the following features, each of which is advantageous in itself and can be combined with each other as desired.

[0008] According to a compact embodiment of the chain link, particularly one with a narrower width transverse to the central plane, at least two traction projections, but preferably – if more than two traction projections are provided – all traction projections, can be arranged on a single longitudinal side of the traction link. The traction link can be asymmetrical with respect to the central plane.

[0009] A traction element that is easier to manufacture is achieved if at least two traction projections, or preferably all traction projections in the case of multiple traction projections, point in the same direction. In particular, the longitudinal directions of the traction projections can run parallel to each other.

[0010] The traction projections can be spaced apart from the ends of the longitudinal side of the traction element, particularly in the direction of the longitudinal axis of the traction element. At least one section of a traction projection can be arranged centrally between the ends of the longitudinal side of the traction element in the direction of the longitudinal axis of the traction element.

[0011] At least one traction ridge can have a cross-section extending perpendicular to its longitudinal direction, which can be, for example, round, rectangular, or trapezoidal. At least one traction ridge can taper along its longitudinal direction. Such a traction ridge is particularly well-suited to digging into a surface, especially a snowpack, and thus increasing traction.

[0012] The traction element can be divided into a base body and the traction projections extending from the base body, or it can be composed of the base body and the traction projections extending from the base body. The base body can correspond to the traction element that is not provided with traction projections.

[0013] The base body can, for example, be cuboid in shape. An elevation view of the traction link's base body can be essentially rectangular, with rounded corners. Of course, the base body can also have other shapes. For instance, it can be designed as a chain link with two legs and connecting prongs. In this configuration, the base body can have a circular cross-section.

[0014] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw To save material or increase mechanical strength, the traction element, in particular the base body of the traction element, may have an indentation, dent, or recess extending along the longitudinal axis of the traction element. The traction element may be concavely curved towards the central plane in the area of ​​the indentation, dent, or recess. The indentation, dent, or recess may, for example, be cylindrical, in particular cylindrical in shape.

[0015] The central plane can divide the traction element into a first traction element section and a second traction element section. In one embodiment, each traction projection can be located entirely within either the first or the second traction element section, at least in the area of ​​its end facing the base body of the traction element. In a particular embodiment, all traction projections can be located either in the first traction element section or in the second traction element section.

[0016] The at least two traction projections can have a base end facing the longitudinal axis of the traction element or the base body and a free end facing away from the longitudinal axis of the traction element or the base body. The free end and the base end of a traction projection can be equidistant from the center plane in a direction perpendicular to the center plane.

[0017] According to one embodiment, the traction projections in the direction of the longitudinal axis of the traction element can be not spaced apart from each other and thus directly adjoin or merge into one another.

[0018] The traction projections can extend from or beyond the base body in a direction perpendicular to the central plane. The traction projections can extend along their entire length, which runs along the longitudinal direction of the traction projections, or only in sections in a direction perpendicular to the central plane.

[0019] The traction element can be a forged part. In one embodiment, the traction projections can be welded to the base body of the traction element.

[0020] To increase the stability of the traction projections and thus the durability of the traction element, according to an advantageous embodiment, at least two traction projections can overlap, at least partially, in a direction perpendicular to the central plane. In this way, the projection surfaces of the at least two overlapping projections, projected perpendicular to the central plane, can

[0021] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw cutting traction protrusions.

[0022] The traction projections do not need to overlap completely in the direction perpendicular to the center plane; they may also only have a section where they overlap. Within this section, the traction projections may be arranged side by side in the direction perpendicular to the center plane.

[0023] At least two traction projections can be interlocked.

[0024] According to a further advantageous embodiment, the traction element can have a normal plane extending perpendicular to its longitudinal axis and central plane, towards which at least one of the traction projections is inclined. In particular, the longitudinal direction of the at least one traction projection can be inclined towards the normal plane of the traction element. Naturally, if at least two traction projections are inclined towards the normal plane, the traction projections need not be inclined to the same degree. For example, one traction projection can be inclined more strongly towards the normal plane than another. Of course, all traction projections of the traction element can also be inclined equally or not at all towards the normal plane.

[0025] To ensure optimal engagement of the traction projections with the ground, regardless of the orientation of the traction element, the longitudinal directions of the at least two traction projections can, according to a further embodiment, point away from each other. The longitudinal directions of the at least two traction projections can, for example, form an obtuse, an acute, or a right angle. Such an obtuse angle can, for example, be in an angular range of approximately 100–120°.

[0026] According to one embodiment, the at least two traction projections can be arranged in a V-shape or U-shape, at least partially, relative to each other. The V- or U-shape can be viewed from a direction perpendicular to the central plane of the traction element. Traction projections arranged in this way can significantly increase traction, as they can dig into the ground like claws.

[0027] In a particularly stable and durable embodiment of the traction element, at least two traction projections can form a common base from which the at least two traction projections extend. The base can be part of the base body. The base can be arranged on the base body, attached, in particular to the

[0028] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw base body. The base can connect the at least two traction projections, particularly in the area of ​​their base ends facing the base body.

[0029] According to a further embodiment, the width of the traction projections, measured perpendicular to the central plane, can be between 50% and 60% of the width of the base body, measured perpendicular to the central plane, from which the at least two traction projections protrude. A traction element designed in this way is particularly compact and stable.

[0030] To ensure the best possible traction regardless of the orientation of the traction element, at least one of the traction projections can, according to a further embodiment, have at least one traction edge inclined towards the central plane. Preferably, the traction edge is arranged in the region of the free end of the traction projection pointing away from the longitudinal axis of the traction element or from the base body.

[0031] At least one traction edge can be inclined towards the normal plane, either alternatively or cumulatively to the midplane. If a traction projection has multiple traction edges, one of these edges can be inclined only towards the midplane, and another can be inclined only towards the normal plane. Naturally, the traction edges of a traction projection can also be parallel to each other or inclined at different degrees to the midplane and / or normal plane. In particular, a skew orientation of the traction edges of a traction projection relative to each other is conceivable.

[0032] In order to save material, in one embodiment the thickness of at least one traction projection, measured along the longitudinal axis of the traction element, can decrease with increasing distance from the central plane, measured perpendicular to the central plane, at least in the region of the free end of the traction projection.

[0033] According to a particularly robust embodiment of the traction element, the at least two traction projections can each have an outer side surface running parallel to the central plane and facing away from the central plane, and / or an inner side surface opposite the outer side surface, wherein the inner and / or outer side surfaces run parallel to the central plane. The inner side surface of at least one of the traction projections, preferably the inner side surfaces of all traction projections, can lie in the central plane of the traction element.

[0034] Particularly good traction can be achieved if, according to a further design...

[0035] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw at least one of the traction projections at its free end facing away from the longitudinal side of the traction element has at least two end surfaces arranged perpendicular to each other.

[0036] In one embodiment, a normal to an end surface can run perpendicular to the longitudinal axis of the traction element and along the median plane. A normal to another end surface can extend in the direction of the longitudinal axis of the traction element and along the median plane.

[0037] One of the end faces can extend along the median plane, in particular parallel to the median plane, and another end face can extend along the normal plane, in particular parallel to the normal plane.

[0038] At least one of the end surfaces can be flat or curved, at least in sections. At least two end surfaces can meet in the area of ​​at least one traction edge, or form the traction edge.

[0039] At least one end surface can taper in a direction perpendicular to the median plane and with increasing distance to the median plane measured perpendicular to the median plane, in particular becoming pointed.

[0040] According to a further advantageous embodiment, at least one of the traction projections can be asymmetrical with respect to at least one plane running parallel to the central plane and through the longitudinal direction of the at least one traction projection. In this embodiment, material can be saved by making the at least one asymmetrical traction projection thicker in sections subjected to higher loads and thinner in sections subjected to lower loads. A traction element of this design is therefore less expensive to manufacture.

[0041] In order to prepare the substrate, in particular an ice layer present there, before the traction projections penetrate by breaking it up and thus further increase the traction of the traction element, the traction element can, according to a further embodiment, have at least one outer traction projection which is arranged at an outer end of the traction element with respect to the longitudinal axis of the traction element, wherein the at least one outer traction projection extends along the central plane and perpendicular to the longitudinal axis of the traction element.

[0042] At least one outer traction projection can extend beyond the inner traction projections in the direction along the median plane and perpendicular to the longitudinal axis of the traction element.

[0043] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw at least one outer traction projection can be designed symmetrically to the central plane of the traction link.

[0044] The at least one outer traction projection may have an indentation, dent, notch, or recess that extends along a longitudinal direction of the outer traction projection. The indentation, dent, notch, or recess may be concave in the direction of the median plane of the traction element.

[0045] Preferably, two or more outer traction projections are provided. The outer traction projections can be arranged symmetrically to the normal plane and / or to the central plane of the traction element.

[0046] To make the traction element connectable to other elements and thus suitable for use within a running net, the traction element, according to a further advantageous embodiment, can have at least one opening in which at least one connecting element can be received, at least partially. The at least one opening is preferably designed as a through-opening, which can extend through the traction element, in particular perpendicular to its central plane.

[0047] In an advantageous embodiment, two openings can be provided, separated from each other by a web. The openings can merge into one another or be connected. For example, the web can be interrupted or broken by a channel, a slot, or a passage.

[0048] The traction projections and the at least one opening may not overlap at all or only slightly in the direction perpendicular to the longitudinal axis of the traction element and along the median plane.

[0049] In a particularly cost-effective and stable design, the traction element can be monolithically formed. Specifically, the base body with the at least two traction projections and / or the at least one outer traction projection can be formed in one piece. The traction element can be cast, particularly injection-molded. A design of the traction element as a one-piece forging is also possible.

[0050] In one embodiment, the traction element can be composed of at least two segments that lie abutting each other along at least one seam line. The seam line can extend at least partially along the median plane.

[0051] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw The problem is further solved by a walking network with a plurality of traction elements and a plurality of connecting elements, wherein each of the traction elements is connected to at least one other traction element and / or to at least one connecting element. Such a walking network significantly increases traction, since many differently oriented traction elements can engage with the ground.

[0052] The connecting links can be designed, for example, as chain links or rings. The connecting links used in a running net do not have to be identical; different types of connecting links can be used. For example, some of the connecting links can be designed as rings and others as chain links.

[0053] Preferably, three or four traction elements are suspended in a connecting link. Of course, in other configurations, more traction elements, for example eight or ten, can be suspended in a connecting link, or fewer traction elements, for example a single one, can be connected to a connecting link.

[0054] The problem is further solved by a tire chain with a running mesh. Such a tire chain is particularly effective, durable, and reliable.

[0055] The invention is explained in more detail below with reference to exemplary embodiments and the accompanying figures. Individual features present in the following exemplary embodiment may be omitted if, according to the embodiments described above, the technical effect associated with that feature is not important. Conversely, a feature described above but not present in a subsequent exemplary embodiment may be added to the exemplary embodiment if the technical effect associated with that feature is important for a particular application.

[0056] In the following, the same reference symbols are used for elements that correspond to each other in terms of structure and / or function.

[0057] They show:

[0058] Fig. 1 is a schematic perspective representation of a traction element according to one possible embodiment;

[0059] Fig. 2 is a schematic perspective front view of the traction element from Fig. 1;

[0060] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw Fig. 3 a schematic perspective top view of the traction element from Fig. 1 ;

[0061] Fig. 4 is a schematic perspective side view of the traction element from Fig. 1;

[0062] Fig. 5 shows a schematic perspective view of a traction element according to another possible embodiment; and

[0063] Fig. 6 shows a schematic perspective representation of a running net according to one possible embodiment.

[0064] The following is a purely exemplary description of the construction of a traction element according to one possible embodiment with reference to Figures 1 to 4.

[0065] The traction element 1 has at least two traction projections 2, which are arranged on or project from a longitudinal side 4 of the traction element 1. In the illustrated embodiment, the traction element 1 has a base body 6 from which the traction projections 2 project. The base body 6 can be essentially cuboid in shape and have a rectangular elevation. In the illustrated embodiment, the traction element 1 is divided into a base body 6 and the traction projections 2, as well as outer traction projections 46, which are arranged on the base body 6.

[0066] In other embodiments, more than two traction projections 2 may be provided, which also project from the longitudinal side 4 of the traction element 1. The traction element 1 has a central plane 8 that extends through the longitudinal side 4 of the traction element 1 and through a longitudinal axis 10 of the traction element 1. In Fig. 2, the central plane 8 of the traction element 1 corresponds to the plane of the blade.

[0067] The traction projections 2 extend with their longitudinal directions 14 parallel to the central plane 8 of the traction member 1. The traction projections 2 do not need to be inclined to a normal plane 12, which extends perpendicular to the longitudinal axis 10 and central plane 8 of the traction member 1, as in the illustrated embodiment. Thus, only one of the traction projections 2 can be inclined to the normal plane 12, or none of the traction projections 2 can be inclined to the normal plane 12, so that the longitudinal directions 14 of the traction projections 2 extend parallel to the normal plane 12 or in the normal plane 12.

[0068] In the illustrated embodiment, the longitudinal directions 14 of the traction projections 2 point away from each other and are arranged here, purely by way of example, in a V-shape relative to each other, whereby the longitudinal directions 14 of the traction projections 2 enclose an obtuse angle 16 (see

[0069] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw Fig. 2). The obtuse angle 16 can, for example, be between approximately 100° and 120°. As can be seen particularly well in Fig. 2, the traction projections 2 can be arranged in a V-shape relative to each other when viewed from a direction perpendicular to the central plane 8. Of course, in other embodiments, the traction projections 2 can also extend along the central plane 8 and perpendicular to the longitudinal axis 10 of the traction element 1. In this embodiment as well, the longitudinal directions 14 of the traction projections 2 run parallel to the central plane 8 of the traction element 1. Naturally, in other embodiments, the traction projections 2 can be arranged such that their longitudinal directions 14 form an acute angle. This acute angle is preferably in an angular range of approximately 30° to approximately 90°.Of course, the longitudinal directions 14 of the traction projections can also extend essentially at right angles or exactly at right angles to each other. In yet other embodiments, the longitudinal directions 14 of at least two traction projections 2 can point in the same direction and extend parallel to each other. Naturally, in other embodiments, the longitudinal directions 14 of all traction projections 2 can point in the same direction or run parallel to each other.

[0070] In the illustrated embodiment, the traction projections 2 can overlap at least partially in the direction perpendicular to the central plane 8. However, it is also conceivable that the traction projections 2 overlap completely or not at all in the direction perpendicular to the central plane 8. In the latter case, the traction projections 2 lie adjacent to one another with respect to a direction running along the longitudinal axis 10 of the traction element 2. As can be clearly seen in Fig. 3, in the illustrated embodiment, the traction projections 2 overlap in the direction perpendicular to the central plane 8 in a section 18 that extends along the longitudinal axis 10 of the traction element 1.

[0071] As can be seen in Fig. 1, the traction projections 2 can form a common base 20 from which the traction projections 2 extend. Thus, the traction projections 2 forming the common base 20 can be connected to each other in the region of the base 20 or via the base 20. As can be seen in Fig. 1, the traction projections 2 can be connected to the base body 6 via the base 20.

[0072] As can be seen particularly well in Figures 1 and 3, each of the traction projections 2 can have an outer side surface 22 that runs parallel to and faces away from the central plane 8, and alternatively or cumulatively have an inner side surface 24 opposite the outer side surface 22, wherein the inner and / or outer side surfaces 22, 24 run parallel to the central plane 8. In one embodiment, the inner

[0073] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw side surface 24 at least one traction projection 2 but also within the median plane 8.

[0074] As can be seen particularly well in Fig. 3, the base body 6 and the traction projections 2 can each have a width 26, 28, measured perpendicular to the central plane 8. In the illustrated embodiment, in which the opposing side surfaces 30 of the base body 6 are curved away from the central plane 8, the width 28 of the base body 6 can correspond to a distance, measured perpendicular to the central plane 8, between the vertices 32 of the side surfaces 30 of the base body 6. In the illustrated embodiment, both traction projections 2 have the same width 26, which, purely by way of example, corresponds here to approximately 50% of the width 28 of the base body 6. Naturally, the widths 26 of the traction projections 2 can be different in other embodiments. Furthermore, the width 26 of a traction projection 2 can be between approximately 50% and approximately 60% of the width 28 of the base body 6 of the traction element 1.The term "approximately" can be understood to mean a deviation of 5 percentage points above or below.

[0075] As can be clearly seen in Figures 1 and 3, the traction projections 2 can have at least one traction edge 34, which facilitates the engagement of the traction projection 1 with the ground. In the illustrated embodiment, the traction edge 34 is arranged at the end of the traction projection 2 facing away from the base body 6 of the traction element 1. As can be seen particularly well in Figure 2, the traction edge 34 can be inclined both to the central plane 8 and to the normal plane 12. Of course, in other embodiments, the traction edge 34 can also be inclined only to the central plane 8 or only to the normal plane 12. However, it is also possible for the traction edge 34 to extend perpendicular to the central plane 8 of the traction element 1.

[0076] In other embodiments, at least one of the traction projections 2 can have several traction edges 34. The multiple traction edges 34 can, for example, extend parallel to each other, or extend in different directions, for example, obliquely to each other.

[0077] The traction projections 2 can have a thickness 36, which can be measured in the direction of the longitudinal axis 10 of the traction element 1. In the illustrated embodiment, the traction projections 1 taper with increasing distance from the center plane 8, measured perpendicular to the center plane 8, so that the thickness 36 of the traction projections 2 decreases in the direction perpendicular to and away from the center plane 8. Of course,

[0078] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw It is also conceivable in other embodiments that at least one of the traction projections 2 has a constant thickness 36. However, one traction projection 2 can also have a changing thickness 36, and another traction projection 2 a constant thickness 36, or the thicknesses 36 of at least two traction projections 2 can change to different degrees.

[0079] The changing thickness 36 of the traction projections 2 is particularly evident in Fig. 3 from the fact that an end surface 40 of the traction projections 2, arranged at each free end 38 of the traction projections 2, is trapezoidal. The end surfaces 40 of the traction projections 2 do not necessarily have to be inclined towards the central plane 8, as can be clearly seen in Fig. 4, but can preferably run perpendicular to the central plane 8 and / or parallel to the normal plane 12.

[0080] As can be seen in the embodiment of a traction element 1 shown in Fig. 5, the traction projections 2 can also be configured differently and, for example, have at least two end surfaces 40 at their free ends 38, which are perpendicular to each other. In particular, a normal 42a of a first end surface 40, 40a can run along the median plane 8 and perpendicular to the longitudinal axis 10 of the traction element 1, and a normal 42b of a second end surface 40, 40b can run along the median plane 8 and along the longitudinal axis 10 of the traction element 1. The normals 42a, 42b of the first and second end surfaces 40, 40a, 40b do not have to be (slightly) inclined to the median plane 8, as in the illustrated embodiment, but can also extend parallel to the median plane 8 of the traction element 1.Thus, one of the end surfaces 40 can be perpendicular to the median plane 8 and along the longitudinal axis 10 of the traction member 1, and another end surface 40 can extend parallel to the normal plane 12 of the traction member 1.

[0081] The traction projections 2 of the traction element 1 shown in Fig. 5 also have a traction edge 34, at which, in the illustrated embodiment, the end surfaces 40 of the traction projections 2, in particular the first and second end surfaces 40a, 40b, meet. In the embodiment shown in Fig. 5, the traction edges 34 are also inclined to both the median plane 8 and the normal plane 12.

[0082] Both the traction projections 2 of the embodiment shown in Fig. 1 and the traction projections 2 of the embodiment shown in Fig. 5 are asymmetrical to a plane 44 that is parallel to the central plane 8 and through the longitudinal axis 14 of the respective traction projection.

[0083] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw projection 2 runs. Of course, in other embodiments, at least one, but preferably all, traction projections 2 can be designed symmetrically to the aforementioned plane 44. In these embodiments, the traction projections 2 can, for example, be cuboid, cylindrical, or conical.

[0084] As can be further seen from Fig. 1, the traction element 1 can have at least one outer traction projection 46, which is arranged at an outer end 48 of the traction element 1 with respect to the longitudinal axis 10 of the traction element 1. In the embodiment shown in Figs. 1 to 4, two outer traction projections 46 are provided, which are arranged at the outer ends 48 of the longitudinal side 4 of the traction element 1 and are symmetrically opposite each other with respect to the normal plane 12 (see Fig. 2). However, if at least two outer traction projections 46 are provided, they do not necessarily have to be identical in design or arranged symmetrically with respect to the normal plane 12.

[0085] As can be seen in Fig. 2, the longitudinal axes 50 of the outer traction projections 46 can extend in the medial plane 8 and perpendicular to the longitudinal axis 10 of the traction element 1, thus projecting from the traction element 1 or from the base body 6 of the traction element 1. The outer traction projections 46 can project beyond the traction projections 2 in the direction of the longitudinal axes 50 of the outer traction projections 46, i.e., project further from the base body 6 of the traction element 1 than the traction projections 2. Of course, in other embodiments, the outer traction projections 46 can alternatively project the same distance from the base body 6 of the traction element 1 as the traction projections 2. However, it is also conceivable that the traction projections 2 project beyond the outer traction projections 46.

[0086] As can be further seen from Fig. 2, the at least one outer traction projection 46 can taper in the direction of its longitudinal axis 50 and away from the longitudinal axis 10 of the traction element 1, in particular becoming pointed. In this way, the at least one outer traction projection 46 can penetrate the ground particularly well when mounted in a tire track. In particular, the outer traction projections 46 can be designed to break up an ice layer on the ground particularly effectively.

[0087] At least one outer traction projection 46 can have a recess 52 which, in the embodiment shown in Fig. 2, extends along the longitudinal axis 50 of the respective outer traction projection 46. The at least one outer traction projection 46 can have a dent, notch, or recess. The recess 52 can, as shown in Fig. 2, be concavely curved inwards, i.e., pointing towards the central plane 8 of the traction element 1.

[0088] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw designed.

[0089] As can be seen from Fig. 2, the traction element 1 can have at least one opening 54 in which at least one connecting element 74 (not shown in Fig. 2) can be received, at least partially. In the described embodiment, two openings 54 are provided, spaced apart from each other along the longitudinal axis 10 of the traction element 1 and separated from each other by a web 56 of the traction element 1. The openings 54 can be designed as through-openings 58, the longitudinal axes 60 of which can extend completely through the traction element 1 perpendicular to the central plane 8 of the traction element 1. In one embodiment, two openings 54 can be connected to each other. In this case, the web 56 located between the two openings 54 with respect to the longitudinal direction 10 of the chain link 1 can be perforated or separated, for example by a channel, a slot, or a passage.

[0090] As can be seen in Fig. 1, the traction element 1 or the base body 6 of the traction element 1 can have a recess 62 that extends along the central plane 8 and along the longitudinal axis 10 of the traction element 1. In the illustrated embodiment, the recess 62 is essentially cylindrical, so that the recess 62 is concave in the direction of the central plane 8 of the traction element 1. The recess 62 can have a height 64 measured along the central plane 8 and perpendicular to the longitudinal axis 10 of the traction element 1, which can correspond to a diameter 66 of the at least one opening 54. In the illustrated embodiment, both an upper end 68 of the recess 62 and a lower end 70 of the recess 62, which runs parallel to the upper end 68 of the recess 62, are tangential to the outlines of the openings 54. This can, for example, help to ensure that the legs of connecting elements 74 inserted into the openings 54 (in Fig.2 not shown) are arranged at least sectionally in the recesses 62, so that the connecting members 74 do not protrude too far in the direction perpendicular to the central plane 8 beyond the traction member 1.

[0091] In a particularly cost-effective embodiment, as shown in Figures 1 to 4, the traction element 1 can be monolithic. In particular, the base body 6, the traction projections 2, and the at least one outer traction projection 46 can be manufactured in one piece. The traction element 1 is preferably designed as a forging, but can also be, for example, a casting, especially an injection-molded part. However, it is also conceivable that at least one of the traction projections 2 and / or at least one outer traction projection 46 is, for example, welded to the base body 6.

[0092] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw Fig. 6 shows a running net 72 for a slip protection device. The running net 72 has a plurality of traction links 1 and a plurality of connecting links 74. The traction links 1, which are not shown in detail here, can be designed according to the embodiments described above or have a different design. The connecting links 74 do not have to be rings, as shown in the embodiment in Fig. 6, but can, for example, also be designed as chain links. Of course, it is also conceivable that different connecting links 74 are used, so that, for example, some of the connecting links 74 are designed as rings and other connecting links 74 as chain links.

[0093] Each connecting link 74 can, for example, have three traction links 1 attached to it, so that the connecting link 74 connects the three traction links 1 to each other. Of course, in other configurations, more traction links 1, for example four or six traction links 1, can be attached to a connecting link 74, or fewer traction links 1, for example a single traction link 1, can be connected to a connecting link 74.

[0094] To create the network structure of the running network 72, the traction elements 1, which are suspended in a connecting element 74, can each be suspended in another connecting element 74. In this way, an alternating arrangement of connecting elements 74 and traction elements 1 can result. Of course, it is also conceivable that at least two traction elements 1 or at least two connecting elements 74 are suspended one another. For example, two connecting elements 74 can be connected via at least two interconnected or suspended traction elements 1. Likewise, it is conceivable that at least two traction elements 1 are connected via two interconnected connecting elements 74.

[0095] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw Reference number

[0096] 1 traction link

[0097] 2 Traction advantage

[0098] 4 Longitudinal side of the traction element

[0099] 6 basic shapes

[0100] 8 Middle level

[0101] 10 Longitudinal axis of the traction element

[0102] 12 Normal plane

[0103] 14 Longitudinal direction of a traction projection

[0104] 16 obtuse angles

[0105] 18 overlapping section

[0106] 20 sockets

[0107] 22 outer side surface

[0108] 24 inner side surface

[0109] 26 Width of a traction ledge

[0110] 28 Width of the base body

[0111] 30 faces of the base body

[0112] 32 vertices

[0113] 34 traction edge

[0114] 36 Thickness of a traction ridge

[0115] 38 free end of the traction advantage

[0116] 40 End area

[0117] 40a first end surface

[0118] 40b second end surface

[0119] 42a Normal of the first end face

[0120] 42b Normal of the second end face

[0121] Level 44

[0122] 46 outer traction advantage

[0123] 48 outer end of the traction element

[0124] 50 Longitudinal axis of the outer traction projection

[0125] 52 Indentation of the outer traction projection

[0126] 54 Opening

[0127] 56 Bridge

[0128] 58 Passage opening

[0129] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw 60 Longitudinal axes of the through-opening

[0130] 62 Exclusion

[0131] 64 Height

[0132] 66 Diameter of the opening 68 Upper end of the recess

[0133] 70 lower end of the recess

[0134] 72 Running net

[0135] 74 Connecting link

[0136] RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw

Claims

Claims 1. Traction element (1) for a running network (72) for a tire track for a land vehicle, with at least two traction projections (2) arranged on a longitudinal side (4) of the traction element (1), each extending in a longitudinal direction (14), with a central plane (8) extending through the longitudinal side (4) and a longitudinal axis (10) of the traction element (1), wherein the longitudinal directions (14) of the at least two traction projections (2) each extend parallel to the central plane (8) of the traction element (1).

2. Traction element (1) according to claim 1, wherein at least two traction projections (2) overlap at least sectionally in a direction perpendicular to the central plane (8).

3. Traction member (1) according to claim 1 or 2, comprising a normal plane (12) extending perpendicular to the longitudinal axis (10) and median plane (8) of the traction member (1), against which at least one of the traction projections (2) is inclined.

4. Traction member (1) according to one of claims 1 to 3, wherein the longitudinal directions (14) of the at least two traction projections (2) point away from each other.

5. Traction element (1) according to one of claims 1 to 4, wherein at least two of the traction projections (2) form a common base (20) from which the at least two traction projections (2) extend.

6. Traction element (1) according to one of claims 1 to 5, comprising a base body (6) from which at least two traction projections (2) protrude, RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw wherein a width (26) of the traction projections (2) measured perpendicular to the median plane (8) is between 50% and 60% of a width (28) of the base body (6) measured perpendicular to the median plane (8).

7. Traction element (1) according to one of claims 1 to 6, wherein at least one of the traction projections (2) has at least one traction edge (34) which is inclined towards the central plane (8).

8. Traction element (1) according to one of claims 1 to 7, wherein the at least two traction projections (2) each have an outer side surface (22) extending parallel to the central plane (8) and facing away from the central plane (8) and / or an inner side surface (24) opposite the outer side surface (22), wherein the inner and / or outer side surfaces (22, 24) extend parallel to the central plane (8).

9. Traction element (1) according to one of claims 1 to 8, wherein at least one of the traction projections (2) has at least two end surfaces (40, 40a, 40b) arranged perpendicular to each other at a free end (38) facing away from the longitudinal side (4) of the traction element (1).

10. Traction element (1) according to one of claims 1 to 9, wherein at least one of the traction projections (2) is asymmetrical with respect to at least one plane (44) running parallel to the central plane (8) and through the longitudinal direction (14) of the at least one traction projection (2).

11. Traction member (1) according to any one of claims 1 to 10, wherein the traction member (1) has at least one outer traction projection (46) arranged at an outer end (48) of the traction member (1) with respect to the longitudinal axis (10) of the traction member (1), wherein the at least one outer traction projection (46) extends along the central plane (8) and perpendicular to the longitudinal axis (10) of the traction member (1).

12. Traction element (1) according to one of claims 1 to 11 , RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw wherein the traction member (1) has at least one opening (54) in which at least one connecting element (74) can be received at least sectionally.

13. Traction element (1) according to one of claims 1 to 12, wherein the traction element (1) is monolithically formed.

14. Running net (72) with a plurality of traction elements (1) according to any one of claims 1 to 13 and a plurality of connecting elements (74), wherein each of the traction elements (1) is connected to at least one other of the traction elements (1) and / or to at least one of the connecting elements (74).

15. Tire chain with a running net (72) according to claim 14. RUD Ketten Rieger & Dietz GmbH u. Co. KG PCT150752-PE424bsw

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