JPH0715830Y2 - Elastic track for crawlers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an elastic crawler track for crawlers used in vehicles for agricultural work, construction work, snow work, and the like.

(Prior Art) Conventionally, as illustrated in FIG. 4, inside the endless belt-shaped crawler belt body 1 made of a rubber-like elastic material and provided with lugs 2 on the outer peripheral surface at predetermined intervals in the circumferential direction. In addition, a crawler elastic crawler track in which a core metal 3 is embedded at a predetermined interval in the circumferential direction, and a tensile member 4 such as a steel cord is embedded between the core metal 3 and the lug 2 over a predetermined width in the circumferential direction. It is known (for example, see Japanese Utility Model Publication No. 61-8909). Further, elastic crawler belts without the cored bar 3 are also widely used, and the tensile body 4 as a reinforcing member is made of steel cord, fiber cord, canvas (canvas) or the like.

(Problems to be solved by the invention) By the way, when the above-mentioned conventional elastic crawler belt is in use, when the cut scratch 5 enters the outer circumferential surface 1a of the crawler belt main body 1 between the lugs 2, it propagates deeply and penetrates deeply to prevent the damage. There was a problem that the steel cord, which is the upholstery body 4, was reached, water entered, and the like, rusting and corrosion proceeded, the steel cord was cut, and the durability of the elastic crawler was impaired. For this reason, there is a crawler belt main body in which a reinforcing layer made of a reinforcing cloth or a tensile strength cord is embedded between the tensile body and the outer peripheral surface in the circumferential direction. As a result, the track body becomes less flexible. Further, it may not be possible to reliably prevent the cut scratches generated on the outer peripheral surface of the crawler belt body from reaching the steel cord with only one such reinforcing layer. And assuming such a case,
If a plurality of reinforcing layers are provided to surely prevent the cut scratches from reaching the steel cord, the flexibility of the crawler belt body is further deteriorated, and a problem that the wheels cannot be smoothly wound around the wheel occurs.

Further, in the case of the reinforcing layer as described above, since the reinforcing cloth or the tensile strength cord is continuous in the circumferential direction of the crawler belt main body, when the cut scratch generated on the outer peripheral surface of the crawler belt main body reaches the reinforcing cloth or the like, There arises a problem that the cut damage spreads along the reinforcing cloth in the circumferential direction of the crawler belt body.

The present invention has been made in view of the above situation,
The purpose of this is that even if there are cut scratches on the outer surface of the crawler belt between the lugs, the elastic crawler track for the crawler can prevent cracks due to the growth of scratches and prevent the tensile body from reaching the tensile body. To provide.

(Means for Solving the Problems) In order to achieve the above object, the present invention takes the following technical means.

That is, the present invention relates to an elastic crawler crawler track in which a tension member 15 is embedded in the crawler belt body 13 formed of a rubber-like elastic material in an endless belt shape in the circumferential direction. An elastic layer 16 formed by mixing innumerable short fibers 17 over a predetermined thickness in the thickness direction of the crawler belt main body 13 is embedded between the outer circumferential surface 13a and the outer circumferential surface 13a in the circumferential direction.

The short fibers 17 mixed in the elastic layer 16 are preferably arranged in a directional manner.

(Operation) According to the present invention, the outer peripheral surface 13a between the lugs 12 of the crawler belt body 13 is
In the case where a cut scratch 18 is formed, when this scratch reaches the elastic body layer 16 containing short fibers, the direction of the crack growth force is dispersed by the short fibers 17, the crack progress is blocked, and a discontinuous and small scratch is formed. Can be stopped. Therefore, the cut wound 18 does not reach the tensile body 15 because its growth is stopped by the elastic layer 16 containing short fibers. Further, the elastic layer 16 increases torsional rigidity and improves desorption resistance.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention, in which an elastic crawler belt 11 is made of a rubber-like elastic material and is provided with lugs 12 at predetermined intervals on the outer peripheral surface in an endless manner. A belt-shaped crawler belt main body 13, a core metal 14 embedded in the crawler belt main body 13 at predetermined intervals in the circumferential direction and at a position of the lug 12, and a predetermined circumferential direction on the outer side (ground side) of the core metal 14. The tensile body (15) and the short fiber mixed elastic resistant layer (16) embedded in the width thereof are constituted.

Although not shown in the drawing, the crawler belt body 13 is provided with engagement holes for the drive sprockets between the cored bars 14.

The material forming the crawler belt body 13 is a rubber-like elastic material, which is a conventionally known material such as natural rubber, urethane rubber, synthetic polyisoprene rubber, polybutadiene rubber, and the like, and includes a reinforcing agent, a filler, a softening agent, a tackifier, and a rubber. A vulcanizing agent, a vulcanization accelerator, etc. are added.

The core metal 14 is a reinforcing member in the width direction, and is formed by casting or forging a metal material into an oval or strip-shaped plate, and has a thick central portion.
A pair of guide projections 14b projecting from both sides of the crawler belt body 13 to the inner peripheral surface (anti-grounding side) of the crawler belt body 13 are integrally formed, and from both sides of the central thick portion 14a to both widthwise sides of the crawler belt body 13. The plate-shaped wing portion 14c extends.

The tensile body 15 is a steel cord, and both wings 14c of the cored bar 14 are formed.
It is embedded on the lug 12 side (ground contact surface side) so as to be parallel to the ground contact surface. A fiber cord or the like is used as the tensile body 15, as long as the elastic crawler belt 11 produces a resistance against the pulling by the driving wheel, and it does not matter whether it is an organic fiber or an inorganic fiber.

The elastic layer 16 containing short fibers is intended to protect and reinforce the tensile body 15, and is manufactured by an extrusion molding method by mixing short fibers 17 into a rubber-like elastic material, as shown in FIG. Moreover, the short fibers 17 are in a mixed state having a certain directionality. That is, the short fibers 17 are arranged in the extrusion direction of the elastic material and are substantially parallel to the longitudinal direction of the elastic layer 16.

Therefore, as shown in FIG. 3, even if the cut scratch 18 enters in the vertical direction on the outer peripheral surface 13a of the crawler belt body 13, the growth of the scratch, that is, the direction of the crack growth force is dispersed, and the crack progress is prevented. It

The rubber hardness of the elastic layer 16 is preferably about 60 to 70 degrees.

Further, as the short fibers 17, it is possible to use organic fibers such as aramid fibers or glass fibers, inorganic fibers such as aluminum fibers, the length is preferably 5mm ~ 10mm, the capacity is 15
About 30% is desirable.

Further, the width of the elastic layer 16 protects the tensile body 15 and is therefore sufficient to wrap the tensile body 15 from the ground contact side.

As shown in FIG. 4, the elastic crawler belt 11 is used by being wound around a drive sprocket 19, a driven wheel and a rolling wheel (not shown) of a work vehicle.

According to the first embodiment described above, when the elastic crawler belt 11 is wound around the drive sprocket 19 and the like of the work vehicle as shown in FIG. 4, the outer peripheral surface 13a between the lugs 12 of the crawler belt body 13 is externally applied. When the cut scratches 18 are included, even if the scratches 18 reach the short fibers 17 embedded in the elastic layer 16, the short fibers 17 receive this and disperse the directions of the growth power of the scratches. The progress of the cracks is prevented, the discontinuity is limited to a small scratch, the cut scratch 18 once received does not spread to the other, and the cut resistance is improved. In this way, since the cut wound 18 does not reach the tensile body 15, the tensile body 15 is protected, and the track body 13 and the tensile body 15 may be peeled off due to the growth of the cut wound. Therefore, durability can be maintained and improved.

FIG. 5 shows a second embodiment of the present invention, which is different from the first embodiment in that the core metal is not embedded in the crawler belt body 13, and the other configurations are the same as those in the first embodiment. Therefore, the same effect can be expected.

Therefore, the same reference numerals as in the first embodiment are used and the description thereof is omitted.

The strength of the tensile body 15 and the elastic layer 16 containing short fibers, the number and width thereof, the ratio of short fibers mixed, etc. in the present invention should be appropriately determined depending on the capability of the work vehicle to be applied, the operating conditions, etc. It is also possible to embed the tensile body 15 and the elastic body layer 16 containing short fibers in a superposed state.

(Effect of the Invention) As described above, the present invention mixes innumerable short fibers 17 between the tensile body 15 and the outer peripheral surface 13a of the crawler belt body 13 over a predetermined thickness direction of the crawler belt body 13. When the outer peripheral surface 13a of the crawler belt body 13 is cut, since the elastic layer 16 is embedded in the circumferential direction, short fibers mixed in a predetermined thickness direction of the crawler belt body 13 are formed. By 17,
It is possible to reliably prevent the progress of cracks due to the cut scratches to the tensile body, and moreover, the elastic layer 16 is made up of innumerable short fibers 17
Therefore, the flexibility of the crawler belt body 13 is hardly impaired, and even if a considerable layer thickness is taken to surely prevent the progress of cracks due to cut scratches to the tensile body, There is no problem in winding the crawler belt body 13 around the wheels. In other words, the elastic body layer 16 can secure a considerable layer thickness in order to reliably prevent the crack due to the cut damage from proceeding to the tensile body.

Further, since the elastic layer 16 is formed by mixing innumerable short fibers 17, the short fibers 17 are discontinuous in the circumferential direction of the crawler belt body 13, and cracks due to the cut scratches in the circumferential direction of the crawler belt body 13. It is possible to limit the spread of cracks to a small range without affecting the spread.

Further, it is relatively easy to adjust the mixing ratio of the short fibers 17, that is, the density to adjust the strength and the layer thickness of the elastic layer 16 according to the type of crawler.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a sectional view, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG.
Fig. 4 is an explanatory view of the action, Fig. 4 is a partial side view of the state of use, and Fig. 5
FIG. 6 is a sectional view of the second embodiment, and FIG. 6 is a sectional view of the conventional example. 11 ... Elastic crawler track, 12 ... Lug, 13 ... Crawler track body, 14 ... Core bar, 15
… Tensile body, 16… Elastic layer, 17… Short fiber.

Claims (3)

[Scope of utility model registration request] 1. An elastic crawler track for a crawler in which a tensile body (15) is embedded circumferentially in a crawler belt body (13) formed of a rubber-like elastic material in an endless belt form, the crawler belt body (13). , Tensile body (15) and outer peripheral surface (13a)
An elastic layer (16) formed by mixing innumerable short fibers (17) over a predetermined thickness in the thickness direction of the crawler belt body (13).
An elastic crawler track for crawlers, which is embedded in the circumferential direction. 2. A cored bar (14) is embedded in the crawler belt body (13) between the tensile body (15) and the inner peripheral surface and at a predetermined interval in the circumferential direction. The elastic crawler track for crawlers according to claim 1. 3. Short fibers (1) mixed in an elastic layer (16)
7. The crawler elastic crawler track according to claim 1, wherein 7) is arranged with directionality.