JPS5852868B2 - elastic track belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to agricultural vehicles such as combines, harvesters, etc.
) etc., and particularly relates to a track belt (hereinafter referred to as crawler) suitable for running on muddy ground.

In order to increase the traction force of the above-mentioned crawler, the endless band-shaped elastic body generally has protrusions or lugs on the outer peripheral surface.
These lugs are arranged in parallel at a constant pitch in the circumferential direction of the belt-shaped main body, but when driving in muddy areas such as wet fields, it is unavoidable that mud adheres between the lugs1, and as a result, the traction function of the lugs gradually decreases. However, in the end, it becomes as if no lugs exist, resulting in reduced traction and, in some cases, a slipping condition that may even impede driving.

In order to improve this point, the applicant has already provided the following roller.

That is, propulsion lugs are provided on the outer circumferential surface of the endless band-shaped elastic body constituting the crawler body, and the ends in the width direction of the track belt body between the lugs are cut inward.

In other words, this is a crawler having a structure in which fin-like lugs protrude outward from the widthwise sides of an endless band-shaped elastic body. The fins act to scrape mud that gets stuck between the lugs, and the mud that gets stuck can be easily pulled out, so even if mud sticks between the lugs, the traction force is maintained by the fins.

The purpose of the present invention is to further enhance the performance of the roller, especially the traction force, and its feature is that the endless elastic body constituting the elastic endless track belt body has a constant circumferential direction. An elastic endless track in which reinforcing core metals are buried horizontally at pitch intervals, tensile reinforcing materials are buried surrounding the rows of the core metals, and propulsion lugs are further provided on the outer peripheral surface of the track belt main body. In the belt, the width direction ends of the track belt main body between the lugs are cut inward to provide fin-like parts on the left and right extensions of the lugs, and the fin-like parts are attached to the track belt main body. It has a part that protrudes to the inner circumference side, in which case the circumferential cross section of the fin-like part is approximately Q with the maximum width at the center.
Particularly preferably, the ratio of the height hl on the inner circumferential side and the height h2 on the outer circumferential side from the maximum width of the fin-shaped portion is approximately 0.5 h1/h2. 2, and furthermore, the maximum width portion of the fin-like portion is formed at approximately the same horizontal position as the horizontal position where the tensile reinforcing material is buried.

Thus, according to the present invention, even if mud becomes clogged between the lugs when driving in a muddy area, the lug portions, that is, the fin-like portions that protrude on both the left and right sides act like paddles, especially on the inner circumferential side and The effect is doubled by the protruding parts on both sides of the outer circumference.

According to experiments, the most preferable shape of the lug is a trapezoidal shape in which the top of a triangle is truncated when viewed in a circumferential cross-sectional shape, but in the present invention, the cross-sectional shape of the fin-like portion is one that protrudes toward the inner circumference. It has a shape that looks like a combination of a part and a part that protrudes toward the outer circumference.

Therefore, a larger traction force is obtained, and according to the present invention, as will be explained below, the mud that is caught between the fins and rolled up is automatically removed by the time the fins touch the ground again. Since it is reliably eliminated, a constant propulsion force is always maintained.

Hereinafter, the present invention will be explained in more detail based on the drawings.

In the conventional crawler shown in FIGS. 1 to 3, 1 is a crawler, 2 is a rolling wheel, 3 is a propulsion lug, and 4 is a hole for engagement with a drive sprocket 4'.

The crawler 1 has a driving sprocket 4 as shown in FIG.
' and is suspended and supported by the wheel 2 and rotates in the direction of the arrow.
If the outer circumferential surface of the mud a, etc. (see Figure 2) that is caught between the lugs 3 and rolled up when it touches the ground is turned upward, the crawler body will get in the way and it will not fall from between the lugs 3 and 3 and will land again in this state. I will do it.

Therefore, in this case, almost no propulsive force or traction force is secured.

Figures 4 to 6 show an embodiment of the crawler according to the present invention, and numeral 5 in the figures indicates core metals embedded horizontally at constant pitch intervals inside the crawler 1 made of a rubber body. , which is generally arranged to correspond to lug 3.

Reference numeral 6 denotes a tensile reinforcing material embedded within the crawler 1 to surround this row of core metals, and generally a steel cord is used.

In such a crawler, the present invention provides a fin-like portion 3° on the left and right extensions of the lug 3, and the fin-like portion is approximately O-shaped when viewed in circumferential cross section as shown in FIG. A wide portion M is formed and tapered toward the inner circumferential side and the outer circumferential side.

In other words, the present invention further enhances the effect of imparting traction force by providing a fin-like portion 3° on the extension of the lug and making the fin-like portion protrude toward the inner circumferential side as well.

In some cases, it may be advantageous to extend the core metal 5 into the interior of the fin 3 to increase the rigidity of the fin.

FIG. 7 shows a modification of the above embodiment, in which the outer circumferential surface of the crawler body is inclined in the width direction, which has the effect of improving lateral soil removal.

FIG. 8 is an enlarged view of a portion corresponding to section A in FIG. 3, for explaining the mud discharge situation of the crawler according to the present invention.

As shown in the figure, mud is sandwiched between the fin-shaped parts 3o at the ground contact part W1, but when this is lifted from the soil by the transmission roller 2, the outer circumferential surface gradually reverses upward in the zone W2. Lug 3 has tip 3' as shown.
As the gap widens greatly, the protruding portions 3'' of the fin-like portions 3° toward the inner circumferential side approach each other.

Therefore, the mud a sandwiched between the lags in the range of Wl is W
2, it is squeezed by the inner protrusion 3'' of the fin-shaped portion 3° and pushed out toward the outer circumference.

In this case, the mud located on the outer peripheral side of the maximum width part M of the fin-shaped portion 3 degrees is acted upon to separate outward (in the direction of arrow P).

This has a synergistic effect with the fact that the lugs widen widely, making it easier to disengage.

Next, when the lug was moved to the range W3, the mud that had been compressed by the inner protrusion 3'' of the fin 3° was
Since the distance between the protrusions 3'' becomes wider, the protrusions 3'' are separated and dropped downward (in the direction of arrow Q).

Therefore, the lug from which the mud has completely fallen off repeatedly comes into contact with the ground, and a predetermined propulsive force, that is, traction force, is effectively exerted.

In the present invention, it is preferable that the maximum width portion M of the fin-shaped portion 3° be placed in a horizontal plane that is approximately the same as the horizontal position where the tensile reinforcing material 5 represented by the steel cord is buried.
The invention is not particularly limited to this, and depending on the case, the maximum width portion M may be placed in the same horizontal plane as the inner peripheral surface of the crawler 1.

Furthermore, when the height from the maximum width part M of the fin-shaped portion 3° to the top of the inner circumference is hl, and the height to the top of the outer circumference is h2, approximately 0.5<h1/h2<2. It is preferable to determine the position of the maximum width part M so that it falls within the above range, and it has been found that when h2 becomes large enough to deviate from the above range, the extrusion force of the mud weakens and it becomes difficult to discharge the mud.

Incidentally, the inclined surface 7 of the inner circumferential side protrusion 3'' in the fin-like portion 3° is such that when the crawler is suspended on the rolling wheel 2, the opposing inclined surface 7 is approximately parallel or expanded slightly outward. It is preferable to provide an inclination angle in advance to such an extent that

Furthermore, if the fin-like portions are tapered at 3°, the soil can be removed particularly well.

9 to 13 show various other embodiments.

Figure 9 shows fins of 3° arranged alternately on the left and right, widening the gap between adjacent fins to improve soil removal, and making the side parts between the lugs open and interlocking. This also makes it easier to remove mud between the lugs.

Of course, the shape of the fin-like portion has the structural characteristics described above.

Figure 10 shows a case where the fin-shaped part is formed with a 3-degree angle in the direction of crawler movement to improve soil removal performance, and Figure 11 shows a case where the fin-shaped part is formed with a 3-degree angle on only one side. In this case, Fig. 12 shows the case where the fin-like part 3° is provided on the extension of the diagonal lugs 3 arranged in a staggered manner, and Fig. 13 shows the narrow width of the top part width with respect to the root part width of the lugs 3. The degree of soil removal from between the lugs 3 and 3 is made relatively large, and the width of the fins 3° is gradually decreased toward the sides, thus making the space between the fins lateral. This figure shows a case where the shape is enlarged and mud is easily discharged from between the fin-like parts.

As described above, according to the present invention, even if mud gets clogged between the lugs of the crawler and the lugs lose their function when traveling in a muddy area, the fins can be used as if they were paddles. The fins act on the fins to scrape the mud, thereby maintaining traction and preventing slippage.The special shape of these fins also allows the sand to completely escape and fall. Traction is always guaranteed.

Further, according to the present invention, since the inner circumferential protrusion of the fin-like portion supports the rolling wheels rolling on the inner circumferential surface of the crawler from the outside, it is possible to obtain the effect that it greatly helps in preventing wheels from coming off. It is something.

[Brief explanation of drawings]

Figure 1 is a plan view of a part of a conventional crawler viewed from the outer peripheral side, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a diagram of the crawler attached to the vehicle body. FIG. 4 is a partial plan view of the crawler according to the first embodiment of the present invention viewed from the outer circumferential side, and FIG. 5 is a side view for explaining the state.
6 is an enlarged scale sectional view taken along line VI-VI in FIG. 5, and FIG. 7 shows a modified version of the crawler according to the first embodiment, which is similar to FIG. A similar sectional view, FIG. 8 is a partial schematic side view illustrating the mud removal situation of the crawler according to the present invention, and FIGS. 9 to 13 show various other embodiments of the present invention, FIG. 5 is a partial plan view similar to FIG. 4; The correspondence relationship between the main parts shown and the symbols is as follows. 1... Crawler (elastic endless track belt), 3...
...propulsion lug, 3o...fin-like part, 3".
・・・・・・Part (of the fin-like part) that protrudes toward the inner circumference, 5.
...Reinforcement core bar, 6...Tensile reinforcement material, M.
...The widest part (of the fin).

Claims (1)

[Scope of Claims] 1. Reinforcing core metals are embedded horizontally at constant pitch intervals in the circumferential direction in the endless elastic body constituting the elastic track belt main body, and tensile reinforcing materials surround the rows of the core metals. In an elastic endless track belt comprising a propulsion lug on the outer circumferential surface of the track body, the ends of the track belt body between the lugs in the width direction are cut inward to separate the left and right sides of the lugs. A fin-like part is provided on the side extension, and this fin-like part has a part that protrudes toward the inner peripheral side of the track belt main body, in which case the circumferential cross section of the fin-like part has a width approximately at the center. An elastic endless track belt characterized by being O-shaped. 2 The ratio of the height hl on the inner circumference side and the height h2 on the outer circumference side from the maximum width part of the fin-like part is approximately 0.5〈ht/h
The elastic endless track belt according to claim 1, characterized in that 2<2. 3. The elastic endless track belt according to claim 1, wherein the maximum width portion of the fin-like portion is formed at approximately the same horizontal position as the buried horizontal position of the tensile reinforcing material.