JP4151943B2 - Elastic crawler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elastic crawler having a cored bar therein, which is used in a crawler traveling device such as an agricultural machine or a construction machine.
[0002]
[Prior art]
As an elastic crawler used for crawler traveling devices such as agricultural machinery and construction machinery, there is one with a cored bar embedded inside in order to secure the strength enough to withstand the driving force received from the drive sprocket. Some elastic crawlers have lugs formed at positions corresponding to the cored bar in the crawler body in order to improve the bending performance when wound around the drive wheel or idler.
[0003]
A conventional elastic crawler in which the core metal and the lug are provided at corresponding positions is formed of a rubber-like elastic body formed such that a plurality of engagement holes penetrating in the front and back directions are arranged at regular intervals in the circumferential direction. A crawler main body, a core metal that is long in the width direction embedded in a portion located between the engagement holes in the crawler main body, and a portion corresponding to both wings in the width direction of the core metal on the outer peripheral surface of the crawler main body. The left and right lugs are integrally formed (see Patent Documents 1 and 2).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-20751 (Claim 1, FIG. 2)
[Patent Document 2]
JP 2000-72056 A (Claim 1, FIG. 1)
[0005]
[Problems to be solved by the invention]
In the above-described conventional elastic crawler, the central thin portion of the crawler body sandwiched between the left and right lugs is not provided with any lugs or has a lower lug height than other portions. In addition, since the central thin part of the crawler body is sandwiched between the engagement holes of the drive sprocket and the thickness on both sides in the circumferential direction is thin, the structure is more easily damaged than the left and right lug formation regions. It has become.
[0006]
For this reason, the engaging claw of the drive sprocket is repeatedly engaged with and disengaged from the central thin portion of the crawler body, or when the crushed stone is repeatedly stepped on the central thin portion of the crawler main body during traveling, the rubber of the central thin portion is removed from the cored bar. It may be peeled off and torn, and the center part in the width direction of the core bar may be exposed. And if the central part in the width direction of the metal core is exposed in this way, the damage of the rubber proceeds from the exposed part to the outer side in the width direction, and muddy water or the like enters the inside of the crawler body and the steel cord There is a risk of causing rust and deterioration to the tensile body made of, etc., leading to cutting of the crawler.
[0007]
In view of such a situation, the present invention provides an elastic crawler provided at a position where a cored bar and a lug correspond to each other, by improving the rupture resistance and water resistance of the central thin portion of the crawler body. It aims at improving the durability.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention takes the following technical means.
That is, according to the first aspect of the present invention, in the elastic crawler provided at a position where a cored bar and a lug correspond to each other, a reinforcing layer is provided at an interval on the outer peripheral side of the central part in the width direction of the cored bar in the crawler body. The reinforcing layer is embedded so that both ends in the width direction of the reinforcing layer enter the left and right lug forming regions, and the reinforcing layer is made of canvas, shorter in the width direction than the core bar, and in the circumferential direction. It has the length which covers the whole width direction center part of a metal core, It is characterized by the above-mentioned.
[0009]
In this case, since the reinforcing layer is embedded in a portion corresponding to the central portion of the crawler body in the width direction (the central thin portion of the crawler main body), the central thin portion is cut deeply by crushed stone or the like until it reaches the core. Is prevented, and the fracture resistance in the central thin portion is improved. In addition, since both end portions in the width direction of the reinforcing layer extend so as to enter the left and right lug formation regions, the central thin portion is difficult to deform in the crawler width direction, thereby preventing the central thin portion from breaking. Improves.
[0010]
The second of the present invention, the adhesive rubber layer excellent in adhesion to the core metal is adhered to the central portion in the width direction of the metal core, the adhesive rubber layer, the left and right widthwise opposite end portions of its It extends so that it may enter into the formation area of this lug, The length of the width direction is formed shorter than the said metal core .
In this case, since the adhesive rubber layer having excellent adhesion to the core metal is attached to the center part in the width direction of the core metal (the part corresponding to the central thin part of the crawler body), the central thin part is subjected to external force. Even if it becomes difficult to peel from the core metal, the fracture resistance at the central thin portion is improved. Further, since both end portions in the width direction of the adhesive rubber layer are extended so as to enter the left and right lug formation regions, even if a crack reaching the core metal occurs in the central thin portion, muddy water from the crack And the like are less likely to enter the tensile bodies (steel cords and the like) on both sides in the width direction, and the water resistance of the central thin portion is improved.
[0011]
Further, according to a third aspect of the present invention, in the first and second aspects of the present invention, a width of a central thin portion sandwiched between the left and right lugs in the crawler body is formed at a central portion in the width direction of the cored bar. It is characterized by being smaller than the width of the thick part.
In this case, since the width of the central thin portion of the crawler body is smaller than the width of the thick portion formed at the central portion in the width direction of the core bar, the formation range of the central thin portion that is a weak point portion against breakage is possible. As a result, the distance from the central thin portion to the tensile body is increased. For this reason, even if a crack occurs in the central thin part, the possibility of the crack growing to a tensile body (steel cord, etc.) on both sides in the width direction becomes smaller, and the fracture resistance of the central thin part is reduced. Will improve.
[0012]
In the first to third aspects of the invention, any two of them can be employed simultaneously, or all of them can be employed simultaneously.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention.
The elastic crawler 1 of this embodiment is used for a crawler traveling device of an agricultural vehicle such as a combine or a harvester, and is mainly used in a wet field. In FIG. 1, approximately two-thirds from the top shows a state when the crawler 1 is viewed from the grounding surface side, and the remaining one-third part is a state when the crawler 1 is viewed from the wheel side. Is shown.
[0014]
As shown in FIG. 1, the elastic crawler 1 has a crawler main body 2 formed by forming a rubber-like elastic material in an endless belt shape. Engagement holes 3 penetrating in the front and back direction are formed at regular intervals in the circumferential direction so that a pawl (not shown) can be inserted. A long cored bar 4 is buried in the crawler width direction (left-right direction in FIG. 1) in a portion located between the engagement holes 3 in the crawler body 2.
[0015]
As shown in FIG. 2, the metal core 4 includes a thick portion 5 located at the center in the crawler width direction, both wing portions 6 extending from the thick portion 5 to the outside in the crawler width direction, and rolling wheels ( In order to restrict the rolling path of the thick wall portion 5 to a certain range, a pair of left and right engaging protrusions 7 projecting from the inner peripheral side are integrally provided. Left and right lugs 8 and 8 are formed in a protruding shape at portions on the outer peripheral surface of the crawler body 2 that correspond to the widthwise wings 6 of the cored bar 4. Each of the left and right lugs 8 and 8 has a substantially trapezoidal cross section and is formed in a substantially linear shape extending in the crawler width direction. The crawler main body 4 has a circumferential position corresponding to the core metal 4 and the same pitch as the core metal 4. 2 is disposed on the outer peripheral surface.
[0016]
As shown in FIG. 1, a central inclined surface 9 that leads to the side surface of the engagement hole 3 is formed on the center side in the crawler width direction of the left and right lugs 8, and is sandwiched between the left and right inclined surfaces 9, 9. The portion is a central thin portion 10 of the crawler body 2 in which the lug 9 is not formed. As shown in FIG. 2, a tensile body 11 made of a steel cord or the like is embedded on the outer peripheral side (the lower side in FIG. 2) of the widthwise wing portions 6 and 6 of the cored bar 4 inside the crawler body 2. The tensile body 11 circulates in an endless manner inside the crawler body 2.
As shown in FIGS. 1 and 2, the elastic crawler 1 of this embodiment is formed between the lugs 8 on the outer peripheral surface of the crawler body 2 in order to increase the circumferential rigidity of the crawler body 2 and reduce the vibration. The trough portion is raised at the bulging portion 12. The bulging portions 12 are arranged in a zigzag pattern that alternates in the circumferential direction and alternates between the left and right sides, and the valleys between the lugs 8 where the bulging portions 12 are not disposed are normal thick portions having a normal thickness. It is set to 13.
[0017]
Moreover, in the elastic crawler 1 of this embodiment, the reinforcement layer 14 is embed | buried under the part corresponding to the width direction center part of the metal core 4 in the crawler main body 2, ie, the said center thin part 10, This reinforcement layer 14 is It is composed of one or a plurality of superposed canvases made of organic high-tensile fibers (for example, polyester-based rayon, vinylon, aramid fibers). As shown in FIG. 2, both ends in the width direction of the reinforcing layer 14 are arranged on the outer side in the crawler width direction with respect to the inclined surfaces 9 of the left and right lugs 8, 8. It extends over a range in the width direction wider than that of the central thin portion 10 so as to be in a state where it enters the formation region of 8,8.
[0018]
The elastic crawler 1 having the above-described configuration is driven in the circumferential direction by rotating the sprocket while the engaging claw of the drive sprocket is hooked in the engaging hole 3 of the crawler body 2, whereby the crawler traveling device is moved in a predetermined direction. Drive to.
At this time, according to the elastic crawler 1 of the present embodiment, since the reinforcing layer 14 made of high-tensile fiber or the like is embedded in the central thin portion 10 of the crawler main body 2, the central thin portion 10 is cored by crushed stone or the like. 4 is prevented from being deeply cut, and the fracture resistance in the central thin portion 10 is improved. In addition, since both end portions in the width direction of the reinforcing layer 14 extend so as to enter the formation regions of the left and right lugs 8 and 8, the central thin portion 10 is integrated with the left and right lugs 8 and 8 in strength. It becomes difficult to deform in the crawler width direction, and this also improves the fracture resistance of the central thin portion 10.
[0019]
4 and 5 show a second embodiment of the present invention.
The present embodiment is different from the first embodiment in that an adhesive rubber layer 15 having excellent adhesion to the core metal 4 is attached to the central portion in the width direction of the core metal 4 instead of the reinforcing layer 14. In the point. For example, NR or BR can be used as the material of the adhesive rubber layer 15.
The adhesive rubber layer 15 also has both ends in the width direction disposed on the outer side in the crawler width direction than the inclined surfaces 9 of the left and right lugs 8, whereby the adhesive rubber layer 15 is disposed on the left and right lugs 8. , 8 extends over a wider range in the width direction than the central thin portion 10 so as to enter the formation region.
[0020]
According to the elastic crawler 1 of the present embodiment, since the adhesive rubber layer 15 having excellent adhesion to the core metal 4 is attached to the central portion in the width direction of the core metal 4, the central thin portion 10 receives external force. However, it becomes difficult to peel from the cored bar 4, and the fracture resistance in the central thin portion 10 is improved.
Further, since both end portions in the width direction of the adhesive rubber layer 15 are extended so as to enter the regions where the left and right lugs 8 and 8 are formed, even if a crack reaching the core metal 4 occurs in the central thin portion 10. Further, it becomes difficult for muddy water or the like from the crack to enter the tensile body 11 made of the tensile bodies on both sides in the width direction, and the water resistance of the central thin portion 10 is improved.
[0021]
FIG. 6 shows a third embodiment of the present invention.
This embodiment is different from the first embodiment and the second embodiment in that the central thin portion 10 is not provided with the reinforcing layer 14 or the adhesive rubber layer 15, and instead, the left and right lugs in the crawler body 2. The width a of the central thin portion 10 sandwiched between 8 and 8 is set to be smaller than the width c of the thick portion 5 formed in the central portion in the width direction of the cored bar 4.
[0022]
For this reason, according to the elastic crawler 1 of this embodiment, the formation range of the central thin part 10 which becomes a weak point part with respect to a fracture | rupture becomes as small as possible, and the distance from the said central thin part 10 to the tensile body 11 (FIG. In the example, since (d−a) / 2) is far away, even if a crack occurs in the central thin portion 10, the crack can grow to reach a tensile body (steel cord, etc.) on both sides in the width direction. And the fracture resistance of the central thin portion 10 is improved.
As shown in FIG. 6, in the elastic crawler 1 of the present embodiment, the distance between the flanges of the left and right lugs 8, 8 is b, and the distance between the left and right tensile bodies 11, 11 is d. , A <b <c <d.
[0023]
The present invention is not limited to the embodiments described above.
For example, the reinforcing means by the reinforcing layer 14 according to the first embodiment, the reinforcing means by the adhesive rubber layer 15 according to the second embodiment, and the reinforcing means by narrowing the central thin portion 10 according to the third embodiment, Not only can each be employed alone, but any two or all of these reinforcing means can be combined and employed in a single elastic crawler 1.
Further, the shape of the lug 8 is not limited to that extending in the crawler width direction, but may be one that is inclined with respect to the crawler width direction.
[0024]
【The invention's effect】
As described above, according to the present invention, the fracture resistance and water resistance of the central thin portion of the crawler main body are improved, so that the durability of the elastic crawler can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view of an elastic crawler according to a first embodiment viewed from a ground contact surface side and a wheel side.
FIG. 2 is a transverse sectional view of the elastic crawler (a sectional view taken along line BB in FIG. 1).
3 is a longitudinal sectional view (a sectional view taken along line AA in FIG. 1) of a central portion in the width direction of the elastic crawler. FIG.
FIG. 4 is a cross-sectional view of an elastic crawler according to a second embodiment.
FIG. 5 is a longitudinal sectional view of a central portion in the width direction of the elastic crawler.
FIG. 6 is an enlarged cross-sectional view of a central portion in the width direction of an elastic crawler according to a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler main body 3 Engagement hole 4 Core metal 5 Thick part 6 Wing part 8 Lug 10 Central thin part 14 Reinforcement layer 15 Adhesive rubber layer a Center thin part width c Core metal thick part width

Claims (3)

A crawler body (2) made of a rubber-like elastic body formed such that a plurality of engagement holes (3) penetrating in the front and back directions are arranged at regular intervals in the circumferential direction, and each of the engagements in the crawler body (2) A long metal core (4) embedded in the portion located between the joint holes (3) and a widthwise wing (6, 6) of the metal core (4) on the outer peripheral surface of the crawler body (2). In an elastic crawler comprising left and right lugs (8, 8) integrally formed in a portion corresponding to
A reinforcing layer (14) is embedded in the crawler body (2) with an interval on the outer peripheral side of the central portion in the width direction of the core metal (4),
Both ends of the reinforcing layer (14) in the width direction are extended so as to enter the formation regions of the left and right lugs (8, 8),
The reinforcing layer (14) is made of canvas, is shorter than the core metal (4) in the width direction, and has a length covering the entire central portion in the width direction of the core metal (4) in the circumferential direction. An elastic crawler characterized by that. A crawler body (2) made of a rubber-like elastic body formed such that a plurality of engagement holes (3) penetrating in the front and back directions are arranged at regular intervals in the circumferential direction, and each of the engagements in the crawler body (2) A long metal core (4) embedded in the portion located between the joint holes (3) and a widthwise wing (6, 6) of the metal core (4) on the outer peripheral surface of the crawler body (2). In an elastic crawler comprising left and right lugs (8, 8) integrally formed in a portion corresponding to
An adhesive rubber layer (15) having excellent adhesion to the core metal (4) is attached to the outer peripheral side of the central portion in the width direction of the core metal (4),
The adhesive rubber layer (15) is extended so that both end portions in the width direction enter the formation region of the left and right lugs (8, 8), and the length in the width direction is longer than that of the core metal (4). An elastic crawler characterized by being formed short . The thick part formed by the width (a) of the central thin part (10) sandwiched between the left and right lugs (8, 8) in the crawler body (2) at the central part in the width direction of the cored bar (4). The elastic crawler according to claim 1 or 2, wherein the elastic crawler is smaller than the width (c) of (5).

Images