JP3483754B2 - Elastic crawler - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic crawler used in a traveling device such as an agricultural vehicle.

[0002]

2. Description of the Related Art As an elastic crawler of this type, for example,
The thing described in Unexamined-Japanese-Patent No. 8-99656 is known. In this conventional type, the crawler body is formed wide to increase the buoyancy in the wetland, and in order to increase the rigidity of the wide crawler to increase the ground contact pressure and reduce the weight, an eccentric core bar and a symmetrical core bar are provided. It was made by using and. That is, in the wide eccentric crawler, the eccentric cored bar and the bilaterally symmetric cored bar are alternately or alternately provided for the cored bar embedded in the crawler body.

[0003]

In the above-mentioned conventional elastic crawler, two types of cores, an eccentric core and a left-right symmetrical core, have to be used, resulting in a high cost.
Therefore, an object of the present invention is to provide an elastic crawler in which the rigidity of a wide crawler is enhanced by one type of core metal.

[0004]

In order to achieve the above object, the present invention takes the following means. That is, the feature of the present invention is that a cored bar is embedded in the crawler main body made of an elastic material at a predetermined interval in the circumferential direction, and a lug is formed on the outer peripheral surface of the crawler main body. In an elastic crawler in which sprocket engagement holes are provided in the crawler body, and projections projecting toward the inner peripheral surface side of the crawler body located on both sides of the engagement holes in the left-right direction are formed on the core metal, the core metal is , Eccentric cores having different distances from the center of the engaging hole to the edge in the left-right direction, the same in the left-right direction of the crawler body
The positions of the left and right edges of the core metal on one side are different.
Earthenware pots are arranged eccentric core metal is alternately changed its direction every predetermined number, and said lug on the eccentric core metal
Correspondingly, from the center of the engaging hole to the left and right edge
The eccentric lags have different distances .

According to the present invention having the above-mentioned structure, since the cored bar is eccentric and is arranged so that its direction is alternately changed by a predetermined number, even if the crawler main body is wide, the horizontal direction thereof Since the cored bar is arranged close to the end, the rigidity of the crawler body is improved. Moreover, since there is only one type of core metal, the cost can be reduced compared to the conventional two types.

With such a lug shape, the rigidity of the crawler body is further improved. The lugs are preferably formed in a straight line in the left-right direction. The engagement hole can be provided in the center of the crawler body in the left-right direction, and
It can also be provided at a position eccentric from the center in the left-right direction. A tensile body is embedded in the crawler body at an outer peripheral side of the core bar, and the tensile bar is prevented from being displaced in a laterally outer side portion of the core bar with respect to the tensile body. It is preferable to form a convex portion for this.

By forming the convex portion in this way, displacement of the tensile member is prevented. It is preferable that an outer end portion in the left-right direction of the crawler body is formed to be thinner than a central portion thereof, and a bulge portion protruding toward the outer peripheral surface is provided along the circumferential direction at the outer end edge. By providing the thin portion, the deformation of the same portion is facilitated and the mud adhered to the crawler body is easily peeled off. Further, by providing the bulging portion, lateral discharge of mud on the ground contact side is prevented.

By widening the circumferential width of the lug at positions corresponding to the left and right ends of the core metal, cut resistance and lug breakage are prevented.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 shows an elastic crawler 1 of the present invention. The upper part of the figure shows the outer peripheral surface of the crawler, the lower part of the figure shows the inner peripheral surface, and they are combined and shown in the same drawing. ing. The vertical direction in the figure is the circumferential direction of the crawler, and the horizontal direction is the width direction.

2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a combined view of the sectional view taken along the line BB of FIG. 1 and the left side view of FIG. is there. 1 to 3, the elastic crawler 1 of the present invention is used in a traveling device for agricultural vehicles such as combine harvesters and harvesters, and is mainly used in wetlands.

The elastic crawler 1 has a crawler body 2 made of an elastic material such as rubber in the form of an endless belt. The crawler body 2 has a core metal 3 with a predetermined interval in the circumferential direction.
Is buried. On the outer peripheral surface of the crawler body 2,
The lug 4 is formed in a protruding shape. A sprocket engaging hole 5 is provided in the crawler body 2 between the core metal 3. The engagement hole 5 is located at the center of the crawler body 2 in the width direction (horizontal direction). Protrusions 6 located on both sides of the engagement hole 5 and projecting toward the inner peripheral surface of the crawler body 2 are formed on the core metal 3. The protrusion 6 regulates the rolling path of rolling wheels (not shown).

As shown in FIG. 4, the core metal 3 has distances L1 and L from the center of the engaging hole 5 to the end edges in the left-right direction.
2 are different (L1> L2) so-called eccentric cores, and the eccentric cores 3 are arranged such that their directions are alternately changed one by one. The lugs 4 are arranged in the width direction (left-right direction) of the crawler body 2. Is formed in a straight line, and is provided corresponding to the position where the eccentric cored bar 3 is arranged. The lug 4 is an eccentric lug having a different distance from the center of the engaging hole 5 to the edge in the left-right direction.

That is, the engaging hole of the embedded core metal 3
The end of the lug 4 located on the longer side (L1) from 5 substantially coincides with the widthwise outer end of the crawler body 2, and the end of the lug 4 located on the shorter side (L2) is It almost coincides with the end position of the buried core 3. And the rug 4
The circumferential width of the top surface of is the width a1 of the central portion near the engaging hole 5.
The width a2 on both sides is wider than that. With such a structure, the rigidity of both sides is improved.

As shown in FIG. 2, the inner peripheral surface of the crawler main body 2 is formed substantially in the same plane in the width direction. Then, the crawler main body 2 has, on the outer peripheral surface side thereof, from the end position of the lug 4 whose distance from the engaging hole 5 is short,
The thin portion 8 is formed via the inclined portion 7. And
An outer peripheral edge of the crawler main body 2 in the width direction is provided with a bulging portion 9 projecting to the outer peripheral surface side along the circumferential direction.

When the end of the cored bar 3 is located on the slanted portion 7 of the crawler body 2, a built-up portion 10 is provided on the crawler body 2 or a lug base is provided as shown by the phantom lines in FIG. By making it wider and thicker, it is possible to improve cut resistance and prevent rug breakage. As shown in FIG. 2, a tensile body 11 is embedded in the crawler body 2 at the outer peripheral side of the core metal 3, and the portion of the core metal 3 outside the tensile body 11 in the left-right direction is located outside. Further, a convex portion 12 for preventing the displacement of the tensile body 11 is formed.

As shown in FIG. 4, the width dimension (W2) of the end portion of the eccentric cored bar 3 that is longer (L1) from the center is narrower than the width (W1) of the center portion. And W1 x 1
The relationship is set to / 3≤W2. Also, the R of the tip
Preferably has a radius of 2 mm or more and W2 / 2 or less. By having such a relationship, stress concentration when the lug is broken can be avoided.

The present invention is not limited to the above-described embodiment, and for example, the shape of the eccentric cored bar 3 is not limited to that shown in FIG. 4, but may be as shown in FIG. . Further, as shown in FIG. 6, the sprocket engaging hole 5 may be provided at a position eccentric from the center position of the crawler body 2 in the width direction (left-right direction). In this case, the eccentric cores 3 are alternately arranged on the basis of the engagement holes 5.

Further, as shown in FIG. 7, the crawler body 2
Long lugs 4a provided over the entire length in the width direction and short lugs 4b shorter than that are alternately arranged, and a buildup portion 13 is provided at the base of one end of the short lug 4b, and the eccentricities are arranged alternately. The part corresponding to the end of the longer side (L1) of the cored bar 3 may be reinforced. In addition, the alternating arrangement of the eccentric core metal 3
The number is not limited to one, but may be two every two or every predetermined number. Further, when the total number of the lugs along the circumferential direction is odd, the alternating arrangement is broken, and such a case is also included in the alternating arrangement of the present invention.

[0019]

According to the present invention, since one type of eccentric cored bar is alternately arranged, the cost can be reduced as compared with the conventional one requiring a plurality of types of cored bar.

[Brief description of drawings]

FIG. 1 is a front view of an elastic crawler showing an embodiment of the present invention, in which an upper part of the drawing shows an outer peripheral surface of the crawler and a lower part of the drawing shows an inner peripheral surface.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a composite view of a cross-sectional view taken along the line BB of FIG. 1 and a left side view of FIG. 1.

FIG. 4 is a front view of an eccentric cored bar.

FIG. 5 is a front view of various eccentric cores showing another embodiment.

FIG. 6 shows another embodiment of the present invention, and is a front view of an elastic crawler in which a sprocket engaging hole is provided at an eccentric position.

FIG. 7 shows another embodiment of the present invention and is a front view of an elastic crawler having long and short lugs.

[Explanation of symbols]

1 elastic crawler 2 crawler body 3 core 4 rugs 5 engagement holes 6 protrusions 7 Inclined part 8 Thin part 9 bulge 11 Tensile body 12 Projection

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Claims (7)

(57) [Claims] 1. A crawler body made of an elastic material, in which a core metal is embedded at a predetermined interval in the circumferential direction, lugs are formed on the outer peripheral surface of the crawler body, and a sprocket is engaged with the crawler body between the metal cores. In an elastic crawler provided with a hole, and projections projecting toward the inner peripheral surface side of the crawler body located on both sides of the engagement hole in the left-right direction are formed in the core bar, the core bar is provided with It is an eccentric cored bar with different distances from the center to the left and right edges, and the left side of the crawler body
The right and left edges of the core on the same side to the right
Differently, the eccentric cores are arranged such that their directions are alternately changed by a predetermined number , and the lugs correspond to the eccentric cores and are arranged in the engaging holes.
Eccentric lugs with different distances from the center to the left and right edges
Elastic crawler, characterized in that that. 2. The elastic crawler according to claim 1, wherein the lug is formed in a straight line in the left-right direction. 3. The engagement hole is provided at the center of the crawler body in the left-right direction.
Elastic crawler as described. 4. The elastic crawler according to claim 1, wherein the engagement hole is provided at a position eccentric from the center of the crawler body in the left-right direction. 5. A tensile body is embedded in the crawler body at an outer peripheral side of the core metal, and the tensile body is provided at a laterally outer side portion of the core metal with respect to the tensile body. The elastic crawler according to any one of claims 1 to 4, wherein a convex portion is formed to prevent the positional deviation of the elastic crawler. 6. The thickness of the left and right outer ends of the crawler body.
Only is formed thinner portion than the central portion, the edge of Dosototan portion,
The elastic crawler according to any one of claims 1 to 5, wherein a bulged portion protruding toward the outer peripheral surface is provided along the circumferential direction. 7. The elastic crawler according to claim 1, wherein a circumferential width of the lug is widened at a position corresponding to an end portion in the left-right direction of the core metal.