JP4682080B2 - Elastic crawler - Google Patents

Description

  The present invention relates to an elastic crawler used for various crawler type traveling devices employed as a traveling unit of a construction machine or an agricultural machine.

  For example, an endless belt-like elastic crawler 110 as shown in FIG. 5 is attached to the crawler type traveling device. The elastic crawler 110 includes an endless belt-like crawler body and a lug group including a plurality of lugs 111 formed in a tapered shape toward the grounding side on both the left and right sides of the crawler width direction. It is arrange | positioned so that it may incline as a whole to the rotation direction back as it goes to a direction outer side.

A vehicle equipped with a crawler type traveling device such as a construction machine or an agricultural machine often moves backward during work. At that time, in the elastic crawler 110, the ground contact surface 112 at the outer end portion in the crawler width direction of the lug 111 tries to get on the curb first while the vehicle is moving backward. Slip off the curb. If this is repeated, the entire edge of the elastic crawler 110 will be damaged, and ear cutting will occur. Therefore, as an improvement of the elastic crawler 110, there is known an elastic crawler 120 of Patent Document 1 in which the outer end portion of the lug 121 in the crawler width direction is formed in parallel with the crawler width direction (see FIG. 6).
JP 2003-89366 A

However, when the elastic crawler 120 of Patent Document 1 tries to climb onto the curb E, the edge of the curb E hits the inclined surface 122 on the rear side in the rotation direction at the outer end portion of the lug 121 in the crawler width direction (see FIG. 7). In this case, since the contact area between the inclined surface 122 and the curb E is small, the lug 121 slides down from the curb E, and the ear cut cannot be sufficiently prevented.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and it is an object of the present invention to reliably prevent the elastic crawler from being cut off by climbing onto an obstacle such as a curb when the vehicle is moving backward.

In order to achieve the above object, the present invention takes the following technical means.
That is, the present invention provides a crawler main body made of an endless belt-like rubber elastic body, a core bar embedded in the crawler main body at a predetermined interval in the crawler circumferential direction, and an outer peripheral surface of the crawler main body. A plurality of lugs formed in a tapered shape toward the grounding side on both the left and right sides of the crawler width direction, and as a whole, behind the elastic crawler in the rotation direction of the elastic crawler as the lugs go outward in the crawler width direction. In the elastic crawler arranged so as to be inclined, when the elastic crawler rides on an obstacle such as a curb when the vehicle moves backward on the rear side in the rotational direction at the outer end in the crawler width direction of the lug, An inclined portion extending in the crawler width direction for preventing sliding down is provided, and the inclined surface of the inclined portion is 4 with respect to the ground-side surface of the crawler body. ° and being inclined at an angle equal to or less than.

  According to the above-described elastic crawler of the present invention, when the elastic crawler climbs on an obstacle such as a curb when the vehicle moves backward, the curb has a surface contact with an inclined surface that is gently inclined at an angle of 45 ° or less. By doing so, the rug can be prevented from sliding off the curb. As a result, the elastic crawler can climb over obstacles such as curbs at the same time, making it difficult to receive damage.

In the present invention, it is preferable that the inclined portion is configured to substantially cover a tip portion of the cored bar in the crawler width direction in the crawler thickness direction.
In this case, since the large thickness of the elastic body on the ground contact surface side of the tip end portion of the core bar in the crawler width direction is ensured, the effect of preventing the ear breakage can be enhanced.

In the present invention, the crawler width direction dimension of the inclined portion is preferably 10 mm or more and ¼ or less of the width dimension of the crawler body.
In this case, the inclined surface can easily be hung on an obstacle such as a curbstone, and the elastic crawler can surely get on the obstacle.

  As the above-mentioned elastic crawler, for example, one in which the total area of the contact surfaces of the plurality of lugs is 20% to 40% of the projected area of the crawler body is employed.

  As described above, according to the present invention, the sloping portion provided at the outer end portion of the lug in the crawler width direction prevents slipping off from the obstacle such as the curb of the lug and can climb onto the obstacle at once. Since it was made possible to do so, it is difficult to receive damage and can prevent the ear from being cut.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of an elastic crawler according to the present invention. The elastic crawler 1 according to the present embodiment is mounted on a crawler type traveling device (not shown) that is employed as a traveling unit of a construction machine, an agricultural machine, etc., and the crawler type traveling device is provided before and after the traveling machine body. It is mainly composed of a drive sprocket, an idler, a wheel group composed of a plurality of wheels arranged between the drive sprocket and the idler, and the elastic crawler 1 wound around the wheel group. .

  The elastic crawler 1 includes a crawler body 2 made of endless belt-shaped rubber, a cored bar 3 embedded in the crawler body 2 at intervals in the crawler circumferential direction, and a ground-side surface that is an outer peripheral surface of the crawler body 2 21 is provided with a lug group formed integrally with 21 and a tensile body (not shown) embedded in the crawler circumferential direction. As shown in FIG. 1, the lug group is composed of a plurality of lugs 4 distributed on the left and right sides of the crawler width direction, and the lugs 4 on the left and right sides are staggered at a pitch twice that of the cored bar 3 in the crawler circumferential direction. It is comprised by arrange | positioning so that it may become. In addition, an engagement hole 5 penetrating the front and back surfaces of the crawler body 2 between the core bars 3 arranged in the crawler circumferential direction and in the crawler width direction central portion of the crawler body 2 is provided so that the engagement claw of the drive sprocket can be inserted. The elastic crawler 1 circulates and rotates when the engaging claw is engaged with the engaging hole 5 and the driving force is transmitted.

  Further, on the grounding side of the core 3, two unillustrated tensile members made of steel cord or the like that regulate the extension of the crawler body 2 circulate endlessly along the entire circumference of the crawler in the crawler circumferential direction with the engagement hole 5 interposed therebetween. is doing. The metal core 3 is formed long in the crawler width direction, and has both wing portions 31 extending from the base portion located in the center to the left and right in the crawler width direction. The rolling wheels straddle both sides of a projection (not shown) formed on the inner peripheral side of the core metal 3, and mainly handle the load from the traveling machine frame or the like.

  The lugs 4 are arranged so as to incline as a whole toward the rear K in the rotational direction of the elastic crawler 1 (hereinafter simply referred to as the rear and the opposite direction as the front) as going outward in the crawler width direction. Further, the lug 4 as a whole is tapered toward the grounding side, and the crawler circumferential cross section is formed in a trapezoidal shape. The inclined side surface z on the front side, the inclined side surface k on the rear side, and the inner side in the crawler width direction are formed. It has a side surface n1, an outer surface n2, and a grounding surface c. The outer end portion of the lug 4 in the crawler width direction is formed so as to be parallel to the crawler width direction, and an inclined portion 41 is formed on the rear K side thereof. The crawler width direction dimension d of the inclined portion 41 is 10 mm or more and ¼ or less of the width dimension of the crawler body, and the total area of the ground contact surfaces of the plurality of lugs 4 is the projected area of the crawler body 2. 20% to 40%.

  An inclined surface k on the rear K side of the lug 4 includes an inner inclined surface k1, a central inclined surface k2, and an inclined surface k3 corresponding to the outer inclined portion (see FIG. 2A). Of these, the inclination angle of the central inclined surface k2 with respect to the ground-side surface 21 of the crawler main body 2 gradually decreases toward the outside in the crawler width direction, and the inclination angle θ of the inclined surface k3 of the inclined portion 41 is the crawler. It is constant at 45 ° in the width direction (see FIG. 2B). Therefore, the central inclined surface k2 becomes wider as it goes outward in the crawler width direction, and the outer inclined surface k3 has a constant width in the crawler width direction.

  The elastic crawler 1 of the present embodiment is characterized in that the angle of the inclined surface k3 of the inclined portion 41 is 45 °, and the inclined surface k3 is an inclined surface of the conventional elastic crawler 120 shown in FIG. It is inclined at a gentler angle than 122. Therefore, the crawler circumferential width h1 of the inclined surface k3 is wider than the crawler circumferential width of the inclined surface 122 of the same portion of the conventional elastic crawler 120. The inclined side surface z on the front side is not made to have a gentler inclination angle than the conventional inclined surface k, but the inclined side surface z on the front side is the same as the inclined side surface k on the rear side. You may form with an easy inclination angle. In addition, as shown in FIG. 1, the inclined portion 41 is configured to substantially cover the tip end portion 31 in the crawler width direction of the core metal 3 in the crawler thickness direction, and the crawler circumferential width of the inclined portion 41 is the core metal. 3 is slightly wider than the crawler circumferential width of the outer end portion 31 in the crawler width direction.

  In the elastic crawler 1 of the present embodiment, the inclined surface k3 of the inclined portion 41 of the lug 4 is inclined at an angle of 45 ° with respect to the ground-side surface 21 of the crawler main body 2, and more than that of the conventional elastic crawler 120. It has become moderate. Therefore, when the elastic crawler 1 rides on the curb E when the vehicle moves backward, the surface of the curb E contacts the inclined surface k3 of the inclined part 41 as shown in FIG. Accordingly, the corner surface of the curb E and the inclined surface k3 of the inclined portion 41 come into surface contact, and the elastic crawler 1 can ride on the curb in a state where the lug 4 is not slid off from the curb E. Thereby, the elastic crawler 1 becomes difficult to receive damage and can prevent an ear piece. In addition, if the inclination angle θ of the inclined surface k3 of the lug 4 is 45 ° or less, it is in surface contact with the edge surface of the curb and exhibits the above effect. However, when the angle exceeds 45 °, the surface contact becomes difficult and the ear is cut off. The prevention effect is reduced.

  Further, since the crawler width direction dimension d of the inclined portion 41 is 10 mm or more and 1/4 or less of the width dimension of the crawler main body, the inclined surface k3 is easily hung on an obstacle such as a curbstone, and the elastic crawler 1 Can get on the obstacle without fail. Furthermore, since the inclined portion 41 is configured to substantially cover the tip end portion 31 of the core bar 3 in the crawler width direction in the crawler thickness direction, a large thickness of the elastic body on the ground contact surface side of the tip portion 31 is secured. The effect of preventing cutting can be enhanced.

  The present invention is not limited to the above embodiment. The inclination angle of the inclined surface k3 may be 45 ° or less, and the lug 4 may be further easily hung on the curb by setting the inclination angle to 30 ° or 20 °. In the above embodiment, the entire outer end portion of the lug 4 in the crawler width direction is formed so as to be parallel to the crawler width direction, but the rear side of the outer end portion is the inclined portion 41 as shown in FIG. Thus, the front side of the outer end portion may be inclined backward. Further, the shape and size of the lugs inclined in the crawler circumferential direction are not limited, and other shapes may be adopted.

It is the top view which looked at the elastic crawler of this embodiment from the grounding side. (A) is the enlarged view which looked at the lug from the earthing | grounding side, (b) is the side view of the aa lug vicinity of (a). It is a figure explaining the contact state of a lug and a curb. The modification of a lug is shown and it is the top view which looked at the elastic crawler from the grounding side. It is the top view which looked at the conventional elastic crawler from the earthing | grounding side. It is the top view which looked at the other conventional elastic crawler from the earthing | grounding side. In the elastic crawler of FIG. 6, it is a figure explaining the contact state of a lug and a curbstone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler main body 3 Core metal 4 Lug 41 Inclined part k3 Inclined surface K The rotation direction back of an elastic crawler

Claims (4)

On the left and right sides of the crawler width direction on the outer peripheral surface of the crawler body, a crawler main body made of an endless belt-shaped rubber elastic body, a core bar embedded in the crawler main body at a predetermined interval in the circumferential direction of the crawler And a lug group composed of a plurality of lugs formed in a tapered shape toward the grounding side, and the lugs are arranged so as to incline as a whole rearward in the rotational direction of the elastic crawlers as they go outward in the crawler width direction. In the elastic crawler
When the elastic crawler rides on an obstacle such as a curb when the vehicle is moving backward, the crawler width direction prevents the lug from slipping off the obstacle when the vehicle moves backward on the rear side in the rotation direction at the outer end portion of the crawler width direction of the lug. An extending slope is provided,
The elastic crawler, wherein the inclined surface of the inclined portion is inclined at an angle of 45 ° or less with respect to the ground-side surface of the crawler body.   The elastic crawler according to claim 1, wherein the inclined portion is configured to substantially cover a tip end portion of the cored bar in the crawler width direction in the crawler thickness direction.   The crawler width direction dimension of the said inclination part is 10 mm or more and 1/4 or less of the width dimension of the said crawler main body, The elastic crawler of Claim 1 or 2.   The elastic crawler according to any one of claims 1 to 3, wherein a total area of the contact surfaces of the plurality of lugs is 20% to 40% of a projected area of the crawler body.

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