Crawler web

A crawler web for a crawler chain of a crawler vehicle, in particular a snow vehicle, is proposed, wherein the crawler web comprises a base rail which is attachable releasably to the crawler chain, a track bracket which is provided for guiding the crawler chain on a chassis of the crawler vehicle, and a tread element which is provided for arrangement on a ground contact side of the crawler chain and for engagement in an underlying surface. According to the invention, the track bracket and the tread element are formed integrally, wherein the tread element is extended over a large part of a length in the longitudinal direction of the base rail.

This application claims the benefit under 35 USC §119(a)-(d) of German Application No. 20 2014 102 210.4 filed May 12, 2014, the entirety of which is incorporated herein by reference.

FIELD OF THE INVENTION

The invention relates to a crawler web for a crawler chain of a crawler vehicle.

BACKGROUND OF THE INVENTION

A wide variety of embodiments of crawler webs for crawler vehicles are known from the prior art. The crawler webs are provided in order to be connected to one or preferably more track belts, wherein the crawler webs are arranged transversely, in particular perpendicularly, to the running direction of the track belts. The running direction of the track belts here is generally oriented parallel to rectilinear driving directions of a crawler vehicle. Comparatively long crawler webs are preferably used here in order to distribute the load of a crawler vehicle over part, in particular over a large part, of a track width of a crawler chain of a crawler vehicle.

For example, in the case of crawler vehicles for winter use, such as, for example, piste preparation vehicles, the crawler webs on a crawler chain are frequently arranged at a comparatively small distance one after another along one or more track belts in the running direction thereof and are preferably provided here as chain webs, in particular engagement webs, of the crawler chain, in which a drive wheel of the crawler vehicle can engage.

In order to ensure secure guidance of the crawler chain on a chassis of the moving crawler vehicle, a crawler chain can have, as is known, guide elements on a side facing the chassis, i.e. on a chassis side of the crawler chain, which guide elements are attached, for example, to the crawler web or to a track belt. A guide track on the chassis side of the crawler chain is generally predetermined with the guide elements, wherein the guide elements keep chassis parts, such as, for example, a drive wheel, for example a track roller and, for example, a runner in a region of the guide track in engagement with the crawler chain and allow the chassis parts to move along in the running direction of the crawler chain on the chassis side thereof. The guide elements of the crawler chain ensure that transverse forces during the driving mode that occur, for example, during cornering or during turning maneuvers can be transmitted by the chassis to an underlying surface and, in the process, the crawler chain reliably maintains a designated arrangement with respect to the chassis. For example, guide elements are known in the form of a track bracket which can be attached, for example, to the crawler web, wherein horn- or hump-shaped projections protrude toward the chassis at, for example, opposite ends of a central piece. The crawler webs are generally arranged on the crawler chain in such a manner that the track brackets follow one another in the running direction and, between the projections, form, for example, a continuous track channel in which, for example, a drive wheel and, for example, a track roller of the chassis can engage.

On the side facing away from the chassis, i.e. on the ground contact side of the crawler chain, crawler webs are customarily equipped with tread means and optionally engagement means in order to ensure effective traction by means of extensive support and optionally also by means of engaging projections on an underlying surface being traveled over. The ground adhesion of the crawler chain and in particular of the crawler webs serves, in addition to transmitting acceleration and braking forces, also for transmitting forces which are directed sideways and which occur, for example, during changes in direction during cornering or, for example, when traveling transversely with respect to the direction of inclination of a slope.

SUMMARY OF THE INVENTION

The present invention is based on the object of providing a crawler web which is improved in respect of wear and maintenance.

The invention is based on a crawler web for a crawler chain of a crawler vehicle, in particular a snow vehicle, wherein the crawler web comprises a base rail which is attachable releasably to the crawler chain, a track bracket which is provided for guiding the crawler chain on a chassis of the crawler vehicle, and a tread element which is provided for arrangement on a ground contact side of the crawler chain and for engagement in an underlying surface. The essence of the present invention consists in that the track bracket and the tread element are formed integrally, wherein the tread element is extended over a large part of a length in the longitudinal direction of the base rail. As a result, transverse forces which occur when traveling, for example, because of a change in direction during cornering or, for example, when traveling transversely with respect to the direction of inclination of a slope, can advantageously be directly transmitted from the track bracket to the tread element, as a result of which, for example, wear of fastening means for a tread element and a track bracket which, for example, are attached separately to the base rail can be avoided.

The demands imposed on a track bracket which can provide a chassis with reliable temporary support differ depending on the underlying surface, with which a tread element is preferably coordinated. A crawler web according to the present invention affords the advantage that, by means of an integral design of track bracket and tread element, it is ensured that a track bracket is mounted at the same time as the tread element, the track bracket being coordinated, for example, with the same transverse forces as the tread element, which are characteristic of a designated use. The base rail here can be coordinated for a uniform distribution of a weight transmitted to the track bracket and of driving forces during traveling, accelerating and braking. By means of an at least partial division of the force transmissions perpendicularly and along the running direction to the track bracket connected integrally with the tread element, and to the base rail, the corresponding parts can be comparatively better coordinated with the loadings associated therewith.

By means of the integral design of tread element and track bracket, the tread element and track bracket can be combinable as one unit with various embodiments of a base rail, for example, in the form of a solid profile rail or, for example, in the form of a hollow profile rail, for the construction of a crawler web. As a result, a crawler web can be assembled differently, for example, as regards weight and, for example, rigidity.

In a preferred refinement of the present invention, the track bracket and the tread element are cast onto the base rail. The track bracket and the tread element can be cast here onto the base rail, for example, by vulcanization from a rubber mixture. This makes it possible to achieve a comparatively strong material connection of a, for example, metallic base rail to the material of the track bracket and of the tread element, ensuring an advantageously high degree of strength and durability of the crawler web. As a result, wear between the tread element or the track bracket and the base rail can advantageously be avoided. Furthermore, when the tread element and the track bracket are cast on, a, for example, metallic base rail can be partially or completely enclosed by a, for example, plastics layer in order to achieve increased protection against corrosion.

For relatively good ground adhesion and in order to reduce driving noises, it is preferred that the track bracket and the tread element are produced from an elastically flexible material, in particular, a rubbery material. A rubber-elastic material also provides relatively high ground adhesion on comparatively smooth surfaces, for example, stone or concrete surfaces which have been worn smooth.

Further materials, such as, for example, plastics or else silicone-based elastic materials can be used individually or in combination with one another for the track bracket and the tread element. For example, by means of a stepwise production process, the track bracket can be cast on consisting of a different material than the tread element. With a tread element composed of an elastic, flexible material, in particular fortified travel ways can be protected. The track bracket composed of an elastic, flexible material permits damping of driving noises of the chassis during locomotion.

A preferred embodiment of the invention consists in that at least two tread profile portions which protrude outwards, in particular downwards, are formed on the tread element and are arranged in an angled manner with respect to each other and with respect to a longitudinal axis of the tread element, in particular of the base rail. Such tread profile portions can absorb forces parallel to the driving direction and also transversely, in particular perpendicularly, to the driving direction, as a result of which improved track guidance can be achieved, in particular during cornering of a crawler vehicle. In particular, the at least two tread profile portions can be arranged symmetrically with respect to each other with respect to the running direction of the crawler chain in order, for example, to avoid a lateral action of force on one side.

Furthermore, it is preferred that the tread element is delimited on the ground contact side by an at least enveloping profile line which has a downwardly precurved profile along a longitudinal axis of the tread element. The tread element here can have a greater profile height in a central portion, for example below the track bracket, than, for example, in the region of end portions of the tread element, in particular of the base rail. The crawler web according to the present invention can thereby have greater penetration depth and ground adhesion in a region of increased loading than, for example, in an outer region of the crawler web, as a result of which a crawler vehicle can negotiate comparatively small turning radii. A crawler chain with crawler webs according to the invention thereby provides improved maneuverability for a crawler vehicle.

A further preferred embodiment of the present invention consists in that a penetrating element, in particular an ice spike, is attached to the crawler web. Safe locomotion on ice or on a similarly hard, smooth underlying surface is thereby possible.

Preferably, a plurality of pointy projections which are arranged separately next to one another and protrude in a common direction and in particular at substantially the same height are formed at one end of the penetrating element for ground contact. If the projections protrude in particular from a common base surface, the penetration depth of the penetrating element and the ecological effect thereof, for example, in respect of ground erodability can thereby be limited.

An attachment sleeve which is provided for attaching the penetrating element, in particular the ice spike, to the tread element can be cast into the tread element. The sleeve is preferably arranged recessed in the tread element, as a result of which, for example, elastically flexible material at least partially surrounds an attached penetrating element in order, for example, to limit a penetration depth. In particular, it is preferred here that the attachment sleeve is arranged in the tread element in such a manner that the attachment sleeve is spaced apart from the base rail by elastically flexible material of the tread element. As a result, the penetrating element is cushioned by the elastically flexible material of the tread element between the sleeve and the base rail in order, for example, to reduce abrasion of the penetrating element, in particular of the projections.

The attachment sleeve can have a thread, in particular an internal thread, for example, on a downwardly directed opening, with which a penetrating element can, for example, be screwed to the tread element. For attachment of the penetrating element, the attachment sleeve can also have a groove of a bayonet catch on an opening directed toward the ground contact side.

A further preferred embodiment of the invention consists in that at least one reinforcing element by means of which the track bracket is at least partially stiffened is formed on the base rail. For example, spring steel bolts which can be recast with the material of the track bracket in order to form horn- or hump-shaped elevations as guide elements can protrude toward the chassis on the base rail in the region of the track bracket.

The attachment sleeve is preferably produced from a metal, in particular from steel. Furthermore, the base rail can be produced from a metal, in particular from a steel. In addition, the base rail can be produced from, for example, a light metal or, for example, from carbon or, for example, from a combination of different materials.

The base rail preferably has an attachment device for an elastic crawler belt. For example, a bore with an internal thread for the screwing on of a crawler belt can be formed on the base rail, wherein preferably a plurality of such bores are provided for a crawler belt. For a crawler chain with a plurality of crawler belts, the base rail is preferably equipped with a plurality of placing devices for crawler belts.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1shows a crawler chain1to which a first exemplary embodiment2aand a second exemplary embodiment2bfor crawler webs according to the invention are attached. For example, in each case three crawler webs2acan be arranged here one behind another in a rolling direction R between every two crawler webs2b.

The crawler webs2aand2bhave an identical width C and are formed with an identical length D perpendicularly to the running direction R. The webs are connected to one another here via flexible belts3a,3band3c. The belts3a,3band3ccan be screwed here onto the crawler webs2a,2b. For a comparatively light and wear-free construction, the elastic belts3a,3band3care arranged at distances from one another, wherein, for example, the belts3aand3bare placed at a distance A2and the belts3band3cat a distance A1. The distance A1between the belts3band3cis coordinated here with a chassis (not shown), in particular a drive wheel (not shown) of a crawler vehicle, which drive wheel can engage with a toothing (not shown) between the crawler webs2aand2bin order to drive the crawler chain1.

The distance B by which the crawler webs2aand2bare separated from each other in the running direction and are attached one after the other is likewise coordinated with the toothing of a drive wheel (not shown).

On the ground contact side, the crawler webs2a,2bare preferably completely covered by the material of the tread element. Tread cleats6a-6kin the form of web-shaped projections which protrude perpendicularly from the ground contact side and which are provided for additional support of the tread element during the engagement in an underlying surface being traveled over are formed on the tread element5. A plurality of tread cleats6acan run parallel to the longitudinal direction of the crawler webs and are used to reinforce traction for an acceleration and a braking of a crawler vehicle (not shown).

In order to provide a crawler vehicle with lateral support, in particular during cornering, a plurality of tread cleats6b,6c,6e,6d,6f,6g,6i,6jand6kare oriented at an angle of, for example, 45° with respect to a longitudinal axis of a crawler web in different directions, i.e. in and counter to a running direction R. The profile cleats6bto6kwhich are arranged in an angled manner provide increased resistance transversely with respect to the driving direction of a crawler vehicle, as a result of which increased driving safety is advantageously achievable with the crawler webs2a,2baccording to the invention. For improved maneuverability, the tread cleats6a-6kcan protrude at a greater height from the tread element5in a central portion of the crawler web2a,2b, for example in the region of the track bracket10, than at outer end regions with respect to a longitudinal axis of the crawler web2a,2b. By means of a correspondingly reduced height of the tread cleats6a-6kat the outer end regions of the crawler web along the longitudinal axis, correspondingly reduced traction forces arise at the end portions during cornering and turning maneuvers of a crawler vehicle.

The crawler webs2aand2bdiffer from one another, for example, in the arrangement of the cleats6ato6k. A further difference between the crawler webs2aand2bconsists in that ice spikes7are additionally insertable on the crawler webs2b, with which ice spikes7locomotion of a crawler vehicle (not shown) on a hard and smooth underlying surface, for example ice, is improved or is only possible at all.

A crawler web2baccording to the invention is shown with further details inFIGS. 2 and 3. It can be seen inFIG. 3that the crawler web2bcomprises a web rail11, on the ground contact side of which a tread element5is formed and which completely covers the ground contact side of the web rail11over the entire length thereof in the longitudinal direction and over the width C thereof.

A track bracket10is formed on a chassis side11aof the web rail11. The track bracket10comprises two separate track humps10aand10bwhich are connected to each other via a central portion10cof the track bracket. The track humps10aand10bprotrude here on the chassis side11aof the web rail11and predetermine a guide track on the crawler chain1for a chassis (not shown) of a crawler vehicle (not shown). As a result, lateral movements of chassis parts (not shown), such as, for example, a drive wheel and, for example, a chassis roller, can be limited along the crawler webs if the chassis parts, for example, engage between the track humps10aand10band are supported on the central portion10c.

The tread element5and the track bracket10are formed here with a continuous material connection, wherein the tread element and the track bracket can be produced, for example, from a single material, in particular by casting, for example injection molding, or by polymerization or by vulcanization.

By means of the in particular integral connection of the tread element5to the track bracket10, forces which are directed sideways and act parallel to the longitudinal axis of the web rail11can advantageously be transmitted directly from the track guide elements of the track bracket10to the tread element5and in particular to the tread cleats6a-6k. In this manner, for example, displacements of the track bracket10and of the tread element5with respect to each other and with respect to the web rail11that, on previously used crawler webs corresponding to the prior art, may result, as wear progresses, to an increasing movement clearance between track guide elements with the chassis and the tread element5, can be reduced or even avoided.

In the event of use under wintry conditions at comparatively low temperatures, the properties of the underlying surface, in particular the flexibility thereof, can change comparatively greatly. Therefore, in addition to the profile cleats6ato6k, the tread element5additionally provides plug-in openings8, into which bolt-shaped ice spikes7made of a hard material, in particular steel, can be plugged. In order to fasten the ice spikes7in the plug-in openings8, metal sleeves9, into which an ice spike7can be, for example, screwed for fastening purposes are embedded on the plug-in openings8. In the region of the plug-in openings8, the profile cleats are preferably reinforced by wall portions6m, as a result of which the metal sleeves9and a large part of a surface of an ice spike7can be enclosed by a more flexible material of the tread element5. This affords the advantage that, in the event of ground contact of the crawler rail2b, an ice spike7can be adapted with respect to the position thereof to the underlying surface. Improved engagement of the ice spike7in a hard, in particular frozen, underlying surface is thereby possible.

A plurality of teeth7aare preferably formed on a point of the ice spikes7, the teeth protruding individually at approximately the same height on the point of the ice spike. This affords the advantage that penetration of an ice spike into an underlying surface can be limited in order to restrict damage to an ecologically sensitive underlying surface.

The web rail11is preferably cast into the tread element5and into the track bracket10in order, by means of corresponding adhesion forces, to avoid wear to the crawler web2bby means of relative movements of the web rail with respect to the tread element and with respect to the track brackets.

FIG. 4illustrates the web rail2bin semi-transparent form, as a result of which even concealed contours can be seen. Clamping pins13which are encased by the track humps10aand10bof the track bracket10are inserted on the upper side11aof the web rail11. This results in an improved transmission of transverse forces perpendicularly to the running or driving direction of a crawler vehicle (not shown).

Furthermore, a plurality of bores12which are provided for the attaching of track belts3a,3band3c, for example by screwing the latter on, are formed on the upper side11aof the web rail11. A comparatively simple and rapid installation of a crawler chain1with the crawler webs2a,2baccording to the invention is therefore possible.

FIGS. 5a, 5b, 5cand 5dshow further details of the crawler web2a,2band in particular of the web rail11. It can be seen inFIGS. 5band 5cthat the web rail11is designed as a substantially rectangular, tubular metal profile rail. The ground contact side11aand the chassis side11bare delimited here in the running direction R by the front side11cand counter to the running direction R by the rear side11d. On the ground contact side11b, the cross-sectional profile of the web rail11has, on the front side11c, a web-shaped projection11eprojecting in the running direction R. On the rear side11d, a further web-shaped projection11f, which is directed counter to the web-shaped projection11e, is formed on the ground contact side11b. The web-shaped projections11eand11fon the ground contact side11benlarge a supporting surface of the crawler web2a,2band permit a correspondingly enlarged design of the tread element5, as a result of which, for example, a tendency of a crawler web2a,2bto buckle on an uneven underlying surface is reduced.

A material strength of the cross section of the web rail11is reinforced in the region of the chassis side11a. This affords the advantage of a comparatively stable anchoring of the clamping pins13in the fastening bores14(FIG. 5c) at which the clamping pins13can be, for example, knocked in. In addition, correspondingly deep bores12, for example for internal threads, can be formed on the reinforced chassis side11a. The depth of the bores12provides an increased contact surface for screw connections, with which the track belts3ato3ccan advantageously be reliably fastened.

FIG. 5dshows a cross section of the crawler web2bin the region of one of the depressions8in the tread element5together with the metal sleeve9which is provided for the attachment of the ice spike7. The depression8is formed in the elastic material of the tread element5in the region of the tread cleat6iand of the wall portion6m. The depression8reaches as far as a base8a, from which the substantially hollow-cylindrical metal sleeve9reaches to just above half the height of the depression. The metal sleeve9has a raised edge9aon the base8aas a result of which an enlarged supporting surface is formed on the metal sleeve in the region of the base8a. The base8ais formed here from the elastic material of the tread element5, with which elastic material the region between the base8aof the depression8and the ground contact side11bof the web rail11is filled. This affords the advantage that the metal sleeve9and an ice spike7mounted therein are mounted elastically in relation to the web rail11by the material of the tread element5.

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