JP2005280552A - Elastic crawler and crawler traveling body using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve driving force of an elastic crawler by preventing falling out of an engagement member in the elastic crawler having the engagement member hung over between right and left guide projections. <P>SOLUTION: The elastic crawler is equipped with a crawler body 11 consisting of endless rubber-like elastic body, a pair of right and left guide projections 12, 12 integrally projected in the inner peripheral side of the crawler body 11, a tensile body 14 embedded in the inside of the crawler body 11 along the peripheral direction, and a hard engagement member 15 which is hung over between the right and left guide projections 12, 12 in a state expanded at the inner side than the inner peripheral surface of the crawler body 11 so that the driving tooth 6 of a sprocket-like driving wheel 3 becomes possible to be engaged. A falling-out prevention part 23 for enhancing an anchoring force relative to respective guide projections 12, 12 are formed on both right and left ends of the engagement member 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elastic crawler used for work machines such as agricultural machines and construction machines, various transport vehicles, and a crawler traveling body using the elastic crawler.

As a rubber elastic crawler used for the crawler traveling body mounted on the various machines, for example, a pair of left and right molded integrally with the crawler main body on the inner peripheral side of a crawler main body made of an endless belt-like rubber-like elastic body. There is a guide protrusion provided with a bulging portion for reinforcement formed between the guide protrusions.
In a crawler traveling body using such an elastic crawler, drive pins projecting left and right are provided on the outer peripheral edge of the drive wheel for rotating the elastic crawler, and the drive pin of the drive wheel is engaged with the left and right guide protrusions. The elastic crawler is caused to circulate by transmitting the power together (see Patent Document 1).

As described above, in the method of transmitting power to the crawler main body mainly by the engagement between the drive pin and the guide protrusion, the driving force from the drive pin is directly applied to the rubber guide protrusion integrated with the crawler main body. The problem is how to ensure rigidity. For this reason, usually, the rigidity of the guide protrusions is increased by increasing the height and thickness of the guide protrusions or by providing reinforcing bulges between the guide protrusions as described above.
However, because the guide protrusion is made of the same rubber-like elastic body as the crawler body, power transmission loss is likely to occur even when the drive pin is engaged, and the drive force may not be sufficiently transmitted, and the guide protrusion may be damaged. There is also sex.

Therefore, a metal or hard resin meshing member is bridged between the left and right guide projections, and the drive teeth of the sprocket-like drive wheels are engaged with this meshing member, thereby ensuring more reliable power transmission to the crawler body. In addition, an elastic crawler has been proposed in which the strength of each guide protrusion is improved (see Patent Document 2).
JP-A-6-255546 JP-A-9-99876

However, in the above-described conventional elastic crawler, the fixing force is ensured by simply embedding the left and right end portions of the meshing member in the left and right guide protrusions, so that the drive wheels are driven during sudden start or sudden reversal. If an excessive driving force is transmitted from the teeth to the meshing member, the meshing member may come out of the guide projection and fall off. For this reason, the conventional elastic crawler cannot increase the driving force so much.
On the other hand, in the above-described conventional elastic crawler, for example, when the elastic crawler meanders when the crawler traveling body suddenly turns, the drive teeth of the drive wheels come into contact with the opposite side surfaces of the guide protrusion, and the wear of the guide protrusion is promoted at an early stage. There is. When the opposing side surfaces of the guide protrusion are worn in this manner, the guide protrusion gradually fades and the embedding depth of the both end portions of the engagement member is reduced, so that the engagement member can easily come out of the guide protrusion and drive the elastic crawler. It can cause power loss.

  In view of such a situation, the present invention provides an elastic crawler having a meshing member spanned between left and right guide protrusions and a crawler traveling body using the same, thereby preventing the meshing member from falling off. The purpose is to improve the driving force.

In order to achieve the above object, the present invention takes the following technical means.
That is, the first aspect of the present invention for achieving the above object is a crawler body made of an endless belt-like rubber-like elastic body, and a pair of left and right guide protrusions integrally projecting on the inner peripheral side of the crawler body, In a state where the tensile body embedded along the circumferential direction inside the crawler body and the drive teeth of the sprocket-like drive wheels can be engaged with each other, the state bulges inward from the inner peripheral surface of the crawler body. In an elastic crawler provided with a hard engagement member provided between the left and right guide protrusions, a retaining portion for increasing the fixing force to each guide protrusion is formed at both left and right end portions of the engagement member. It is characterized by being.

According to the first aspect of the present invention, since the retaining portions for increasing the fixing force with respect to each guide projection are formed at the left and right end portions of the meshing member, the meshing member comes out of the guide projection and falls off. Is prevented. For this reason, even when an excessive driving force is transmitted from the drive teeth of the drive wheels to the meshing member at the time of sudden start or sudden reversal, the meshing member will not come out of the guide projection. The power can be improved.
The retaining portion having such a retaining function is constituted by, for example, a projecting member projecting in the crawler circumferential direction integrally formed at both ends in the crawler width direction of the meshing member embedded in the guide protrusion. Can do. In addition, the retaining portion can be configured by holes formed at both ends in the crawler width direction of the meshing member embedded in the guide protrusion. Note that this hole may be either a through hole or a bottomed hole.

  A second aspect of the present invention for achieving the above object is a crawler main body made of an endless belt-like rubber-like elastic body, a pair of left and right guide protrusions integrally protruding on the inner peripheral side of the crawler main body, and the crawler In the state where the tensile body embedded in the circumferential direction inside the main body and the drive teeth of the sprocket-like driving wheels can be engaged with each other, the left and right sides bulge inward from the inner peripheral surface of the crawler main body. In the elastic crawler provided with a hard meshing member provided between the guide projections, the drive teeth of the drive wheel are arranged on the guide projections at portions located between the left and right guide projections of the meshing member. A stepped portion for restricting contact with the opposite side surface is formed.

  According to the second aspect of the invention, the step portion formed in the portion located between the left and right guide protrusions in the meshing member restricts the drive teeth of the drive wheels from contacting the opposing side surfaces of the respective guide protrusions. Even if the crawler traveling body turns sharply and the elastic crawler meanders, the drive teeth of the drive wheels do not contact the opposite side surfaces of the guide protrusions, and the wear of the guide protrusions is not promoted by the drive teeth. For this reason, it is possible to prevent the engagement member from coming out as the guide protrusions are thinned and the embedding depth of the left and right ends of the engagement member is reduced, and the driving force of the elastic crawler can be maintained for a long time.

In the present invention, when the crawler outer peripheral surface of the meshing member is flat, when the elastic crawler is wound around the sprocket-like driving wheel, the tensile body in the crawler body is bent into a polygonal shape ( FIG. 8 (a)), there is a possibility that fatigue accumulates in the portion where this bending is repeated and the tensile body is cut. Therefore, it is recommended that the surface of the meshing member on the outer periphery side of the crawler be a curved surface having substantially the same radius of curvature as the driving wheel.
In this case, when the elastic crawler is wound around the sprocket-like drive wheel, the tensile body in the crawler main body is curved substantially along the outer peripheral shape of the drive wheel (see FIG. 8B). For this reason, it is prevented that the tensile body repeats bending locally as described above, and it is possible to prevent the tensile body from being cut due to the accumulation of fatigue.

  Also, in the case of a structure in which the left and right guide protrusions are integrally projected from the inner peripheral surface of the crawler body like the elastic crawler of the present invention, the torsional rigidity and bending rigidity of the crawler body are relatively small. The point may also cause the meshing member to drop off. Therefore, it is preferable to improve the rigidity of the crawler main body by embedding a reinforcing layer made of a bias cord or the like on the outer peripheral side or inner peripheral side of the tensile body inside the crawler main body or both of them.

Further, when the drive teeth of the drive wheel are engaged with the meshing member spanned between the left and right guide projections, such as the elastic crawler of the present invention, between the adjacent meshing members on the inner peripheral surface of the crawler body. Preferably, a clearance groove extending in the crawler circumferential direction for preventing interference with the drive teeth of the drive wheel is formed in this portion.
If such a relief groove is formed, the crawler main body is prevented from being damaged by the tip of the drive tooth, so that the durability of the elastic crawler can be further improved.

  As described above, according to the present invention, it is possible to prevent the meshing member spanned between the left and right guide protrusions from falling off as much as possible, so that the elastic crawler having the meshing member and the crawler traveling body using the elastic crawler The driving force can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an elastic crawler according to a first embodiment of the present invention and a crawler traveling body using the elastic crawler.
As shown in FIG. 3, the crawler traveling body 1 according to the present embodiment is mounted on a work machine such as an agricultural machine or a construction machine, various transport vehicles, and the like. Drive wheel 3 disposed at one end (left side in FIG. 3) of the side wall of traveling machine body 2, driven wheel (not shown) disposed at the other end of the side wall of traveling machine body 2, and the lower end of the traveling machine body It comprises a plurality of rolling wheels 4 arranged in the section and an elastic crawler 5 made of a rubber-like elastic body wound around each of the wheels 3, 4.

  The driving wheel 3 of the crawler traveling body 1 is formed of a sprocket having driving teeth 6 arranged at equal intervals in the circumferential direction on the outer peripheral edge, and a central portion of the driving wheel 7 projects horizontally from one end of the traveling body 2. It is directly connected to the protruding end. Further, the roller 4 of the crawler traveling body 1 is attached to a rotating shaft 8 that protrudes in the horizontal direction from the lower end portion of the traveling machine body 2 so as to be freely rotatable. The roller 4 includes a pair of left and right circular flanges 9 and 9 (see FIG. 1A) that are separated from each other in the axial direction, and left and right guide protrusions 12 and 12 described later between the flanges 9 and 9, respectively. In this state, the roller 4 is brought into contact with the inner peripheral surface of the elastic crawler 5 so that the elastic crawler 5 is guided in the crawler circumferential direction so as not to be removed.

  As shown in FIGS. 1 and 2, the elastic crawler 5 of the present embodiment includes a crawler main body 11 that has an endless belt-like rubber-like elastic body and does not have an engagement hole penetrating in the thickness direction, and the crawler main body 11. A pair of left and right guide protrusions 12 and 12 projecting integrally on the inner peripheral side (upper side of FIG. 1A), and projecting integrally on the outer peripheral side of the crawler body 11 (lower side of FIG. 1A). The crawler body so that a large number of the lugs 13 for traction, the tensile body 14 embedded in the crawler body 11 along the circumferential direction, and the drive teeth 6 of the sprocket-like drive wheel 3 can be engaged with each other. 11 is provided with a hard meshing member 15 provided so as to be bridged between the left and right guide projections 12 and 12 in a state of bulging inward from the inner peripheral surface.

  Among these, the crawler body 11 is formed in an endless belt shape having a substantially constant thickness by a rubber-like elastic body, and the crawler width direction (the left-right direction in FIG. 1A) central portion on the inner peripheral surface of the crawler body 11 In addition, the pair of left and right guide protrusions 12 and 12 made of a rubber-like elastic body made of the same material as the crawler body 11 are integrally projected. The left and right guide protrusions 12 and 12 are block bodies having a substantially rectangular plane cross section and a substantially trapezoidal side cross section, and are formed in the same shape on the left and right sides so as to be symmetrical with respect to the center line of the crawler body 11. ing. The left and right guide protrusions 12 are provided over the entire circumference of the crawler main body 11 at regular intervals in the crawler circumferential direction (the paper surface penetration direction in FIG. 1A).

The tensile body 14 is for imparting tension resistance to the elastic crawler 5, and a tensile cord 16 made of a steel cord or the like extending along the crawler circumferential direction is arranged in parallel in the crawler width direction. It is constituted by.
On the other hand, in the case of a structure in which the left and right guide protrusions 12 and 12 that are separated in the crawler width direction are integrally projected from the inner peripheral surface of the crawler body 11 as in the elastic crawler 5 of this embodiment, Since the torsional rigidity and the bending rigidity are relatively small, the engagement member 15 may be dropped off.

Therefore, in the elastic crawler 5 of the present embodiment, reinforcing layers 17 and 18 made of a bias cord or the like are embedded in the crawler outer peripheral side and inner peripheral side of the tensile body 14 inside the crawler main body 11. , 18 to improve the rigidity of the crawler body 11. The reinforcing layers 17 and 18 are made of a canvas formed by weaving a large number of high-tensile fibers, and the fiber direction is in a biased state inclined with respect to the crawler circumferential direction and the crawler width direction. It is buried all around.
In addition, the above-mentioned canvas is prepared by applying a predetermined lower twist to an organic filament fiber, producing cords for warp and weft, arranging these cords so as to have a predetermined number of driving, and weaving them with a loom. It is formed into a sheet by performing an adhesive treatment using an adhesive. Examples of the material of the filament fiber include natural polymer fibers such as cotton, rayon, and cellulose, aromatic polyamide, aliphatic polyamide, and polyester.

  Of the reinforcing layers 17 and 18 disposed on the front and back sides of the tensile body 14, the first reinforcing layer 17 disposed on the outer periphery side of the crawler has a two-layer structure in which the canvas is embedded in a state where two canvases are stacked. The canvases 17A and 17B are spread over a range in the crawler width direction substantially corresponding to the tensile body 14. Further, the second reinforcing layer 18 disposed on the inner peripheral side of the crawler also has a two-layer structure in which the canvas is embedded in a state of being overlapped. However, the inner peripheral canvas 18A includes left and right guides. The left and right canvases 18B are arranged separately corresponding to the respective root portions of the protrusions 12 and 12, and the canvas 18B on the outer peripheral side extends over the crawler width direction range corresponding to both the root portions of the left and right guide protrusions 12 and 12. .

If the required rigidity of the crawler body 12 is ensured, it is not necessary to provide both the first and second reinforcing layers 17 and 18 and only one of them may be provided. Although not shown, as another technical means for increasing the torsional rigidity and bending rigidity of the crawler body 11, a flat hard core material extending in the crawler width direction is embedded in the crawler body 11. May be.
The drive wheel 3 is formed in a sprocket shape having a large number of drive teeth 6 at regular intervals on the outer periphery thereof, and the meshing member for transmitting the drive force by the drive teeth 6 meshing with the crawler body 11 side. 15 is provided.

The meshing member 15 is made of a metal such as high carbon steel or a hard resin such as FRP, and is provided between the guide projections 12 and 12 in a state where the root portions of the left and right guide projections 12 and 12 are connected. It arrange | positions so that it may swell further inside (the upper side of Fig.1 (a)) rather than the internal peripheral surface of the crawler main body 11. FIG. The meshing member 15 has a function of reinforcing the guide projections 12 themselves by connecting the left and right guide projections 12, 12 to each other.
As shown in FIG. 1, the meshing member 15 of the present embodiment includes a central barrel 20 at the center in the crawler width direction and a pair of left and right protrusions extending in the crawler circumferential direction provided at both ends of the central barrel 20 in the crawler width direction. First projecting members 21 and 21, a pair of left and right connecting arms 22 and 22 projecting outward in the same direction from both ends in the crawler width direction of the central body portion 20, and the tips of the connecting arms 22 and 22, respectively. A pair of left and right second projecting members 23, 23 projecting in the circumferential direction of the crawler are integrally provided.

Among these, the left and right second projecting members 23, 23 are thick plate members that are substantially oblong in the side view, and are slightly in the center in the crawler width direction from the center of the guide projections 12 inside the guide projections 12, 12. It is buried in a more biased position. Accordingly, the second projecting member 23 functions as a retaining portion for increasing the fixing force of the meshing member 15 with respect to the guide protrusions 12 and 12.
The second projecting member 23 made of a substantially oblong thick plate member is further chamfered in a rounded shape at the end in the thickness direction, and has a sharp corner with respect to the rubber material constituting the guide protrusion 12. I don't have it. For this reason, when the driving force received by the meshing member 15 is transmitted to the guide protrusion 12 via the second overhanging member 23, stress concentration is prevented from occurring inside the protrusion 12. Cracks from the inside are less likely to occur.

As shown in FIG. 1A, when the guide protrusion 12 is cut horizontally at a substantially upper end height of the first projecting portion 21, the outer rubber gauge of the guide protrusion 12 is B, and the thickness of the second projecting member. When the length is A and the inner rubber gauge of the guide projection 12 is C, the dimension is set so that B ≧ A ≧ C, and the inner rubber gauge C is dimensioned so that C ≧ 0.15 × A. Has been.
More specifically, in the case of the elastic crawler 5 of the present embodiment, it is sufficient that the inner rubber gauge C is about 1.0 to 2.0 mm because the first overhang portion 21 is provided. Further, it is sufficient that the thickness A of the second projecting member 23 is about 3 mm or more.

On the other hand, the first projecting members 21 and 21 on the left and right are also made of thick plate members having a substantially oblong shape in a side view, but are smaller than the second projecting member 23 and slightly on the outer peripheral side (see FIG. ) On the lower side). The first projecting members 21, 21 are disposed in a portion of the meshing member 15 located between the left and right guide protrusions 12, 12, and the facing distance is larger than the thickness of the drive teeth 6 of the drive wheel 3. It is getting bigger.
Therefore, the drive teeth 6 of the drive wheel 3 that have entered between the opposing side surfaces of the guide protrusions 12 and 12 are positioned in the crawler width direction by the left and right first projecting members 21 and mesh with the central body portion 20. This restricts the drive teeth 6 from coming into contact with the opposite side surfaces of the guide protrusion 12. For this reason, the first projecting member 21 functions as a stepped portion that restricts the drive teeth 6 of the drive wheel 3 from contacting the opposing side surfaces of the guide protrusions 12 and 12.

In the present embodiment, the first projecting portion 21 and the central body portion 20 are covered with a thin skin portion 24 that is integrally connected to the opposite side surface of the guide protrusion 12.
For this reason, the first projecting member 21 is disposed at a position away from the guide protrusion 12 in the crawler width direction, and is integrated with the guide protrusion 12 via the thin skin portion 24 and the crawler outer peripheral side. Since the lower half portion is embedded in the crawler body 11, it also functions as a retaining portion for increasing the fixing force of the meshing member 15 with respect to the guide protrusions 12, 12.

The central body portion 20 of the meshing member 15 has a crawler outer peripheral surface having a curved surface with substantially the same radius of curvature as that of the drive wheel 3 when viewed from the side (the state shown in FIG. 2), and the crawler outer peripheral surface. Is a substantially semicircular surface having a smaller radius of curvature than the curved surface.
The outer surface of the thin skin portion 24 covering the central body portion 20 of the meshing member 15 is a substantially arc-shaped meshing surface corresponding to the groove portion between the drive teeth 6 in the drive wheel 3. Thus, in this embodiment, since the meshing surface of the meshing member 15 and the groove portion of the drive wheel 6 are each formed in an arc shape, the drive wheel 3 and the meshing member 15 are smoothly meshed and meshed. The subsequent drive wheel 3 and the meshing member 15 are also smoothly separated, so that the elastic crawler 5 smoothly circulates around the drive wheel 3.

  As described above, when the engagement of the driving wheel 3 with the thin skin portion 24 of the meshing member 15 is repeated, the wear of the thin skin portion 24 will eventually progress and break, but in this embodiment, the central body portion 20 Since the first projecting members 21 are provided at both ends in the crawler width direction, this fracture is prevented from growing up to the guide protrusion 12. When the thin skin portion 24 around the central barrel portion 20 is almost completely peeled off and the central barrel portion 20 is exposed, power is transmitted by the engagement of the hard materials without the rubber coating. Therefore, there is an advantage that energy loss is reduced.

Therefore, in the elastic crawler 5 of the present embodiment, the central body portion 20 of the meshing member 15 and the first projecting members 21 on the left and right sides thereof need not necessarily be rubber-coated integrally with the crawler main body 11 and the guide protrusion 12. Alternatively, it may already be exposed to the outside at the product shipping stage.
Although the illustrated engagement member 15 is illustrated as a solid member, a hollow pipe material may be used to reduce the weight.

Further, in the present embodiment, the crawler outer peripheral surface of the central body portion 20 of the meshing member 15 is a curved surface having substantially the same radius of curvature as that of the drive wheel 3, so that the durability of the tensile body 14 can be improved. There are also advantages.
That is, as shown in FIG. 8A, when the crawler outer peripheral surface of the meshing member 15 is flat, when the elastic crawler 5 is wound around the sprocket-like drive wheel 3, the resistance in the crawler main body 11 is reduced. The tension body 14 is bent into a polygonal shape, and fatigue accumulates in the portion where the bending is repeated, so that the tension body 14 is easily cut.

  On the other hand, in the present embodiment, the crawler outer peripheral surface of the meshing member 15 is a curved surface having substantially the same radius of curvature as that of the drive wheel 3, so that the elastic crawler 5 as shown in FIG. Is wound around the sprocket-like drive wheel 3, the tensile body 14 in the crawler body 11 is curved substantially along the outer peripheral shape of the drive wheel 3. For this reason, it is prevented that the tensile body 14 repeats bending locally as described above, and cutting of the tensile body 14 due to accumulation of fatigue can be prevented.

In order to obtain the above-described effects, the radius of curvature of the curved surface of the meshing member 15 may be set within a range of approximately ± 20% with respect to the radius of curvature of the drive wheel 3.
Further, as shown in FIGS. 1 and 2, the crawler body 11 has an inner peripheral surface between adjacent meshing members 15 in the crawler circumferential direction to prevent interference with the drive teeth 6 of the drive wheels 3. An extending escape groove 25 is formed, thereby preventing the crawler main body 11 from being damaged at the tip of the drive tooth 6.

  According to the elastic crawler 5 of the present embodiment having the above-described configuration, the fixing force with respect to the guide protrusions 12 and 12 is enhanced by the second projecting members 23 integrally formed at the left and right ends of the engagement member 15. The meshing member 15 is prevented from coming out of the guide protrusions 12 and falling off. For this reason, even when an excessive driving force is transmitted from the drive teeth 6 of the drive wheels 3 to the meshing member 15 at the time of sudden start or sudden reversal, the meshing member 15 does not come out of the guide protrusion 12. Therefore, the driving force of the elastic crawler 5 is improved.

Further, according to the elastic crawler 5 of the present embodiment, the first projecting member 21 provided in the portion located between the left and right guide protrusions 12, 12 in the meshing member 15 is connected to the drive teeth 6 of the drive wheel 3 by the guide teeth 6. Since contact with the opposite side surfaces of the protrusions 12 and 12 is restricted, even if the crawler traveling body 1 turns sharply and the elastic crawler 5 meanders, the drive teeth 6 of the drive wheels 3 contact the opposite side surfaces of the guide protrusions 12. The drive teeth 3 do not promote wear of the guide protrusions 12.
For this reason, the engagement protrusion 15 is prevented from coming off as the guide protrusion 12 is thinned and the embedding depth of the left and right ends of the engagement member 15 is reduced, and in this respect, the driving force of the elastic crawler 5 is increased for a long time. Can be maintained.

FIG. 4 shows an elastic crawler 5 according to the second embodiment of the present invention.
In the present embodiment, the central concave portion 27 is formed between the left and right first projecting members 21 and 21 by making the crawler circumferential width of the central body portion 20 of the meshing member 15 smaller than that in the first embodiment. The crawler width direction dimension of the central recess 27 is larger than the thickness of the drive teeth 6.
As described above, in this embodiment, since the central recess portion 27 is formed, the rubber gauges in the front and rear of the central body portion 20 in the crawler circumferential direction are increased, so that the driving wheel 3 is repeatedly engaged between the guide protrusions 12 and 12. However, there is an advantage that the rubber coating around the central barrel 20 is difficult to peel off.

FIG. 5 shows an elastic crawler 5 according to the third embodiment of the present invention.
In this embodiment, instead of the second overhanging member 23 in the first embodiment, thick plate-like fixing plates 28 and 28 extending outward in the crawler width direction are integrally formed at both ends of the engagement member 15 in the crawler width direction. The fixing plates 28 and 28 are embedded in the left and right guide protrusions 12 and 12, respectively.
Each of the fixing plates 28 and 28 is formed with one or a plurality of holes 29 penetrating in the crawler circumferential direction, thereby preventing the fixing projections 12 and 12 from being detached. The part is composed. The hole 29 may be a bottomed hole.

FIG. 6 shows an elastic crawler 5 according to the fourth embodiment of the present invention.
In the present embodiment, the crawler outer peripheral side portion of the second projecting member 23 protrudes further to the crawler outer peripheral side (lower side in FIG. 6) than the central body portion 20. For this reason, the embedding depth with respect to the crawler main body 11 is increased as compared with the case of the first embodiment, and the function of preventing the engagement member 15 from being detached by the first projecting member 21 is strengthened as compared with the case of the first embodiment.
In the meshing member 15 of the present embodiment, the end surface of the central body portion 20 on the crawler inner peripheral side is not covered with the thin skin portion 24 and is exposed to the outside.

FIG. 7 shows an inner peripheral protrusion portion of the elastic crawler according to the fifth embodiment of the present invention.
In the present embodiment, the left and right guide protrusions 12 and 12 are connected to each other by the intermediate protrusions 30 having substantially the same size as these, so that the three protrusions 12, 30, and 12 overlap in the crawler width direction. Blocks are formed.
For this reason, the meshing member 15 of the present embodiment includes a central body portion 20 embedded in the intermediate protrusion 30, and a fixing plate 28 with a hole portion 29 projecting from the end surface in the crawler width direction of the body portion 31. The first overhang member 21 in the first embodiment is not provided.

The above-described embodiments are all illustrative and not restrictive.
For example, in the above embodiment, the retaining portion (second overhanging member 23 or hole 29) for increasing the fixing force to each guide projection 12, 12 and the drive tooth 6 of the drive wheel 3 are provided on each guide projection 12, 12. You may decide to employ | adopt only any one among the level | step-difference parts (1st overhang | projection member 21) which controls contacting with an opposing side surface.
Further, the first and second projecting members 21 and 23 are not limited to the thick plate-like members, and can be constituted by a plurality of tongue pieces or projecting portions protruding from the outer surface of the meshing member 15.

Further, through holes or bottomed holes may be formed in the first and second projecting members 21 and 23 to further improve the fixing force with respect to the rubber material surrounding the periphery.
Further, if drive pins are provided so as to project from the left and right side surfaces of the drive wheel 3 and the pins are brought into contact with the guide projections 12 in addition to the meshing of the drive teeth 6, the power transmission to the elastic crawler 5 can be more reliably performed. It can be carried out.

(A) is the cross-sectional view of the elastic crawler which concerns on 1st embodiment of this invention, (b) is the top view which looked at the elastic crawler from the inner peripheral side. It is a longitudinal cross-sectional view of the elastic crawler of FIG. It is a side view which shows an example of the crawler traveling body of this invention. (A) is the top view which looked at the elastic crawler concerning 2nd embodiment of this invention from the inner peripheral side, (b) is the side sectional drawing. It is the top view which looked at the elastic crawler which concerns on 3rd embodiment of this invention from the inner peripheral side. It is side surface sectional drawing of the elastic crawler which concerns on 4th embodiment of this invention. It is a top view which shows the inner peripheral side projection part of the elastic crawler which concerns on 5th embodiment of this invention. It is a side view which shows the deformation | transformation state of a tension body when an elastic crawler winds around a drive wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crawler traveling body 2 Traveling machine body 3 Drive wheel 4 Rolling wheel 5 Elastic crawler 6 Drive tooth 11 Crawler main body 12 Guide protrusion 13 Lug 14 Tensile member 15 Engagement member 17 First reinforcement layer 18 Second reinforcement layer 21 First overhang member ( Steps)
23 Second overhang member (preventing part)
25 Escape groove 29 Hole (prevention part)

Claims (9)

A crawler body made of an endless belt-like rubber-like elastic body, a pair of left and right guide protrusions integrally projecting on the inner peripheral side of the crawler body, and a tensile member embedded in the crawler body along the circumferential direction The hard engagement provided between the left and right guide protrusions in a state of bulging inward from the inner peripheral surface of the crawler body so that the drive teeth of the sprocket-like drive wheels can be engaged with each other In an elastic crawler comprising a member,
An elastic crawler characterized in that a retaining portion for increasing the fixing force with respect to each guide projection is formed at both left and right end portions of the engagement member.   2. The elastic crawler according to claim 1, wherein the retaining portion includes an extending member that projects in the crawler circumferential direction and is integrally formed at both ends in the crawler width direction of the meshing member embedded in the guide protrusion.   The elastic crawler according to claim 1, wherein the retaining portion includes holes formed at both ends in the crawler width direction of the meshing member embedded in the guide protrusion.   The step part which controls that the drive tooth | gear of the said driving wheel contacts the opposing side surface of each guide protrusion is formed in the part located between the said left and right guide protrusion in the said engagement member. Crab elastic crawler. A crawler body made of an endless belt-like rubber-like elastic body, a pair of left and right guide protrusions integrally projecting on the inner peripheral side of the crawler body, and a tensile member embedded in the crawler body along the circumferential direction The hard engagement provided between the left and right guide protrusions in a state of bulging inward from the inner peripheral surface of the crawler body so that the drive teeth of the sprocket-like drive wheels can be engaged with each other In an elastic crawler comprising a member,
An elastic crawler characterized in that a stepped portion for restricting the drive teeth of the drive wheels from contacting the opposing side surfaces of each guide projection is formed in a portion located between the left and right guide projections in the meshing member. .   The elastic crawler according to any one of claims 1 to 5, wherein a surface of the meshing member on an outer peripheral side of the crawler is a curved surface having substantially the same radius of curvature as the drive wheel.   The elastic crawler according to any one of claims 1 to 6, wherein a reinforcing layer made of a bias cord or the like is embedded in the crawler outer peripheral side or inner peripheral side or both of the tensile body in the crawler main body.   The clearance groove extended in the crawler circumferential direction for preventing the interference with the drive tooth of the said drive wheel is formed in the part between each adjacent meshing member in the internal peripheral surface of the said crawler main body. The elastic crawler in any one.   A traveling wheel, a driving wheel disposed at one end of the traveling body and arranged at equal intervals in the circumferential direction on the outer periphery, a driven wheel disposed at the other end of the traveling body, A crawler traveling body comprising a roller wheel disposed at a lower end portion of the traveling machine body and the elastic crawler according to any one of claims 1 to 8 wound around each of the wheels.

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