JPH04189687A - Resilient crawler - Google Patents

Abstract

PURPOSE:To reduce a waste soil resistance and a turning resistance on a soft ground by forming lugs integrally moulded in an outer circumferential surface of a main body of a resilient crawler along the circumference at intervals to have a square or circular plane view, and setting the length the along circumference to be similar to or less than a width of the main body. CONSTITUTION:A resilient crawler 1 is composed of an endless main body 2 moulded or resilient material such as rubber, a number of core metals 3 (reinforcement bodies) embedded at a predetermined interval along the circumference and expanded along the width, and tension members 4 comprising steel cord or the like embedded along the circumference, and lugs 5 are integrally moulded at an interval P along the circumference in an outer circumferential surface of the main body 2. The lug 5 has a circular plane view, and a ring-like recessed part 6 having a cross section of an inverse triangle is provided at its grounding surface 5a. A circumference length l (outer diameter of the lug) of the lug 5 is set to be a little smaller than a width (w) of the main body 2, and the grounding length is selected to be the optimum size for a pivotal turn. In turning a vehicle, therefore, disturbing motion to the surface soil can be reduced especially on a soft ground, thereby the waste soil resistance can be reduced, and the turning resistance can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an endless belt-shaped elastic crawler track mainly made of an elastic material such as rubber, used in agricultural machinery, construction machinery, various transport vehicles, snowmobiles, etc. It is something.

(Prior art) Generally, in agricultural mobile machinery or construction machinery, etc.
Track-type vehicles have been adopted because of their superior traction performance, and there have been some conflicts as illustrated in FIG. 18. In the figure, 11 is a drive wheel, 12 is an idler wheel, and 13 is a rolling wheel, and an endless elastic crawler belt 14 is wound around these.The drive wheel 11 is equipped with a drive pin or a sprocket. used. The elastic crawler track 14 has a large number of reinforcing bodies (for example, core metals) extending in the width direction of the main body embedded at predetermined intervals in the circumferential direction in an endless belt-shaped main body made of an elastic material such as rubber. It is known that a tensile member such as a steel cord is buried in the circumferential direction, and lugs are integrally formed on the outer peripheral surface of the main body at predetermined intervals in the circumferential direction in correspondence with the reinforcing member (for example, Japanese Patent Application Laid-Open No. -229781
(see publication).

Conventionally, the lug 15 pattern of the elastic crawler track 14 is shown in FIG.
As shown in a) to (d), the letter shape pattern ((a)
)), a single character pattern ((b) in the same figure), a staggered pattern ((C) in the same figure), a compound pattern ((d) in the same figure), etc.

(Problem to be Solved by the Invention) By the way, the traction performance of the elastic crawler track 14 increases in proportion to the ground contact area, so expanding the track contact area is beneficial for improving performance, and also reduces the ground contact pressure and improves the vehicle performance. This has the advantage of reducing sinking, increasing buoyancy, and reducing rolling resistance. However, when a vehicle turns, a large ground contact area increases turning resistance and soil removal resistance, disturbs and moves the topsoil of the field, and eventually leads to the running part getting stuck. Furthermore, in the conventional lug pattern, soil is discharged from the center portion of the crawler track to the ends in the width direction when turning, which further increases turning resistance and soil removal resistance. Therefore, in order to reduce the turning resistance when turning, a vehicle has been developed that is equipped with a pivot turning mechanism that turns with a reduced ground contact area (see FIG. 19). However, when pivoting, a high ground load is applied to the lug 15, which increases earth removal and turning resistance, and reduces durability due to damage to the lug.

The present invention was made in view of the above-mentioned circumstances, and
The purpose of this is to reduce earth removal resistance and turning resistance when turning, especially on soft ground, and to reduce earth removal resistance and turning resistance even when a high ground load is applied to the lug during pivot turning. To provide an elastic crawler track capable of reducing damage and improving durability.

(Means for Solving the Problems) In the present invention, the following technical measures were taken in order to achieve the above object.

That is, in the present invention, a plurality of reinforcing bodies 3 extending in the width direction of the main body 2 are embedded at intervals in the circumferential direction in an endless belt-shaped main body 2 made of an elastic material, and a tensile member 4 is embedded in the circumferential direction. In the elastic crawler track 1 in which lugs 5 are integrally formed on the outer peripheral surface of the main body 2 with intervals in the circumferential direction, the lugs 5 have a rectangular or substantially circular shape in plan view, and the circumferential length P is equal to that of the main body 2. It is characterized by being approximately the same as or less than the width W.

Note that it is preferable that the lug 5 is provided with a recess 6 in the ground plane 5a.

(Function) According to the present invention, the shape of the lug 5 is rectangular or approximately circular in plan view, and the length in the circumferential direction is ! is approximately the same as or less than the width W of the main body 2, so when the vehicle turns, the disturbance movement of the topsoil is reduced, and the soil removal resistance is reduced, even on soft ground, and the turning resistance can be reduced. . Also,
Even when the ground contact area is reduced by pivot turning and a high ground contact load is applied to the lug 5, earth removal resistance is reduced, and therefore turning resistance is reduced, so that smooth turning can be performed.

In addition, by providing the recess 6 in the ground contact surface 5a of the lug 5, soil is enclosed to reduce damage, and vibrations when running on a hard road are alleviated. - (Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 and 2 show a first embodiment of the present invention, in which an elastic crawler track 1 includes an endless belt-shaped main body 2 formed of an elastic material such as rubber or synthetic resin, and a predetermined interval in the circumferential direction within the main body 2. A large number of core bars 3 (reinforcing bodies) extending in the width direction of the main body 2 buried in each case, and a tensile body 4 made of steel cord etc. buried in the circumferential direction on the ground side of the core bar 3. It consists of

A lug 5 having a circular shape in plan view is integrally formed on the grounding side (outer peripheral surface) of the main body 2 at a predetermined interval P in the circumferential direction corresponding to the core bar 3, and the grounding surface 5a of the lug 5 is provided with an annular recess 6 having a substantially inverted triangular cross-sectional shape, and the circumferential length of the lug 5 (in this embodiment, the outer diameter of the lug) is made slightly smaller than the radius W of the main body 2, pivoting the contact length. The dimensions are selected to be optimal for turning. Further, the annular recess 6 reduces the ground contact area of the lug 5, and also serves to trap soil and reduce its destruction.

The core bar 3 is provided with a pair of left and right drive wheel engaging protrusions 7 that protrude toward the skin contact side (inner circumferential side) so as to be located on both sides of the center in the width direction of the main body 2. The force is transmitted to the main body 2 via the core metal 3.

The tensile body 4 is arranged in a shape that is distributed left and right in the width direction.
It is arranged on the opposite side (grounding side) corresponding to the engaging protrusion 7 of.

According to the first embodiment, since the lug 5 has a circular shape in plan view and is provided with the annular recess 6 in the ground contact surface 5a, the ground contact area is reduced, and the disturbance of the field topsoil during turning is reduced, and the soil is removed. Since the resistance is reduced, the turning resistance is reduced, allowing the crawler-equipped vehicle to turn smoothly, reducing damage to the lugs 5, and improving durability. In addition, when pivoting, a high ground load acts on the lug 5, but because of its circular shape, it has high locking properties and can adequately handle the load, reducing earth removal resistance and turning resistance, so turning can be carried out smoothly. can.

In addition, since the ground contact surface 5a of the lug 5 is provided with an annular recess 6, it is possible to enclose soil and reduce damage, and also to reduce vibrations when driving on a hard road surface. Since the main body 2 is made of an elastic material such as rubber, the soil is easily separated and discharged by deformation of the rubber or the like.

3 to 5 show a second embodiment of the present invention, and the difference from the first embodiment is that the cross-sectional shape of the annular recess 6 formed in the ground surface 5a of the lug 5 is in the shape of an abbreviated letter. The driving sprocket engagement hole 8 is provided at the center of the main body 2 in the width direction, and the same effects as in the first embodiment can be expected. Therefore, the same reference numerals as in the first embodiment will be given and the explanation will be omitted.

6 and 7 show a third embodiment of the present invention, and a second embodiment of the present invention is shown in FIG.
The difference from the embodiment is that the recess 6 of the lug contact surface 5a is circular in plan view, and the same effects as the second embodiment can be expected.

8 and 9 show a fourth embodiment of the present invention, and a third embodiment of the present invention is shown in FIG.
The difference from the third embodiment is that the concave portion 6 of the lug contact surface 5a is oval in plan view, and the same operation and effect as the third embodiment can be expected.

FIG. 10 shows a fifth embodiment of the present invention, which differs from the third embodiment in that the circumferential position of the lug 5 corresponds to the core bar 3 at the center between each core bar 3. , the same effect as the third embodiment can be expected.

FIG. 11 shows a sixth embodiment of the present invention, which differs from the first embodiment in that the center of the core metal 3 and the center of the lug 5 coincide;
In addition, the recessed portion 6 is divided into two in the circumferential direction and has a substantially semicircular shape in plan view, and the same effects as in the first embodiment can be expected in this embodiment as well.

FIG. 12 shows a seventh embodiment of the present invention, which differs from the first embodiment in that the lug 5 is square in plan view and a square recess 6 is formed. It has effects such as time.

FIG. 13 shows an eighth embodiment of the present invention, which differs from the seventh embodiment in that the recess 6 of the lug 5 is annular, and provides the same functions and effects as the seventh embodiment.

FIG. 14 shows a ninth embodiment of the present invention, which differs from the third embodiment (see FIGS. 6 and 7) in that the planar shape of the recess 6 of the lug 5 is approximately square. Effects equivalent to those of the third embodiment can be expected.

FIG. 15 shows a tenth embodiment of the present invention, and a seventh embodiment (
12) in that the lug 5 is square in plan view, each corner extends in the longitudinal direction and width direction of main body 2, and the recess 6 is circular in plan view. Similar effects can be expected.

16 and 17 show an eleventh embodiment of the present invention, in which the lug 5 is circular in plan view and the lug 5 is square in plan view.
The core bars and tensile members are arranged alternately at equal pitches in the circumferential direction, and the core bars and tensile members are buried in the same way as in the other embodiments, and provide the effect of inter-tracking and the like. In this embodiment as well, the ground contact area can be reduced by providing a concave portion in the ground contact surface 5a of the lug 5.

The present invention is not limited to the above-mentioned embodiments. For example, the shape of the lug 5 in plan view may be an ellipse, an ellipse, or a rectangle, and the core bar 3 may be replaced with another reinforcing body. Alternatively, the elastic crawler belt may be used in an elastic crawler track which does not have a core metal and has a large number of engagement holes for the driving sprocket in the center of the width direction of the main body 2 and in the circumferential direction. It doesn't have to be an interval.

(Effects of the Invention) As described above, the present invention includes a plurality of reinforcing bodies 3 extending in the width direction of the main body 2 and embedded at intervals in the circumferential direction in the endless belt-shaped main body 2 made of an elastic material. In an elastic crawler track 1 in which a tension body 4 is embedded in the circumferential direction, and lugs 5 are integrally formed on the outer peripheral surface of the main body 2 at intervals in the circumferential direction,
The lugs 5 have a rectangular or substantially circular shape in plan view, and have a circumferential length 2 that is substantially the same as or less than the width W of the main body 2, so that they can be mounted on a vehicle. When turning, it is possible to reduce earth removal resistance and turning resistance especially on soft ground, making it possible to turn smoothly and ensuring sufficient traction performance. It can cope with the ground load, has less earth removal and turning resistance, and can smoothly turn, and can reduce damage to the lug 5 by one member and improve durability.

In addition, by forming the recess 6 in the contact surface 5a of the lug 5, the contact area of the lug can be reduced, soil compression/friction and soil removal resistance can be reduced, and the soil can be enclosed to reduce destruction. , which can reduce vibrations when driving on hard roads.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention,
Figure 1 is a plan view of the main part on the ground side, Figure 2 is A-A in Figure 1.
The line sectional view and FIGS. 3 to 5 show a second embodiment of the present invention, FIG. 3 is a plan view of the main part on the ground side, and FIG.
5 is a sectional view taken along line C-C in FIG. 3, FIGS. 6 and 7 are ground-side plan views of main parts showing the third embodiment, and D-D in FIG. 6. , l, 'jl sectional view, Figures 8 and 9
The figure is a grounding side plan view of the main part showing the fourth embodiment and a sectional view taken along the line E-E in Fig. 8, and Figs. 10 to 15 show the grounding part of the main part showing the fifth to tenth embodiments, respectively. A side plan view, FIGS. 16 and 17 are ground-contact side plan views and side views of essential parts showing the eleventh embodiment, FIG. 18 is a schematic side view of a vehicle equipped with elastic tracks, and FIG. 19 is a pivot view. A schematic side view of a vehicle equipped with a turning function, and FIGS. 20(a) to 20(d) are explanatory diagrams of a conventional lug pattern shape. 1... Elastic crawler belt, 2... Main body, 3... Reinforcement body, 4
... Tensile body, 5... Lug, 5a... Ground plane, 6.
・Concavity! ...Lug circumferential length, W...Body width. Patent applicant: Otsu Tire Co., Ltd., Ward 12, No. 141, Ward 13, Ward 15, Fig. 20 (C) Fig. 20 (d)

Claims (2)

[Claims] (1) A plurality of reinforcing bodies (3) extending in the width direction of the body (2) are embedded at intervals in the circumferential direction in the endless belt-shaped body (2) made of an elastic material, and a tensile body (4) is embedded in the circumferential direction, and lugs (5) are integrally formed on the outer peripheral surface of the main body (2) with intervals in the circumferential direction, the lugs (5) having a rectangular or approximately circular shape in plan view. An elastic crawler track characterized in that the circumferential length (l) is approximately the same as or less than the width (w) of the main body (2). (2) The lug (5) has a recess (6) in the ground plane (5a).
The elastic crawler track according to claim (1), wherein the elastic crawler track is provided with: