JP2009029205A - Elastic crawler, and manufacturing method for elastic crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic crawler excellent in durability and a manufacturing method for an elastic crawler. <P>SOLUTION: The elastic crawler 1 has a crawler body 8 formed in an endless belt shape by an elastic body; a tension body 11 formed in a band shape by a plurality of tension force cords 18 and buried in the crawler body while neighborhoods to both ends in the longitudinal direction are superposed; and weave cord 12 in which the cords are knit in a net-like shape. The weave cord is positioned at a ground-contact surface side of a superposed portion near both ends of the tension body, and covers a part including the whole part in the longitudinal direction and the whole part in the width direction of the superposed portion or an outer edge in the width direction. It is buried in the crawler body while projected by 10 mm or more to an outer side in the width direction than the outer edge in the width direction of the superposed portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an elastic crawler in a crawler type traveling device used for a civil engineering work machine, a construction working machine, an agricultural working machine, and the like.

The elastic crawler is formed in an endless belt shape, and in a crawler type traveling device such as a civil engineering work machine, a drive sprocket (drive wheel) provided on either one of the front and rear in the traveling direction, and one or the other provided on the other side The crawler type traveling device is caused to travel by being wound around a plurality of idlers (rolling wheels) and a plurality of provided wheels and circulating in the circumferential direction.
Since this elastic crawler is subjected to a large tension in its circumferential direction, a tensile body formed by arranging a plurality of tensile cords such as steel cords in the width direction of the crawler for the purpose of increasing the strength of the elastic crawler, It is buried in a state where it is wound once in the crawler circumferential direction.

However, since each tensile strength cord is annular, both end portions are usually overlapped and embedded in an elastic crawler, and the portion of the tensile body where the tensile strength cords are overlapped has high rigidity. Therefore, the portion where the tensile strength cords are superposed and the rigidity is increased has a problem that fatigue is easily caused by a bending moment repeatedly received when passing through the driving wheel and the rolling wheel and is easily broken.
To solve this problem, the tensile code string is divided into a plurality of lines, and the portions where the end portions of the tensile code strings overlap each other are arranged in a zigzag manner in the circumferential direction. An elastic crawler has been proposed in which rows of second steel cords and the like having an inclination angle of more than 80 ° are arranged (Patent Document 1). In addition, the outer end of the tensile cord string is arranged in an oblique direction with respect to the crawler width direction, the overlapping portions of the tensile cords are dispersed over a wide area to reduce the increase in rigidity, and the tensile strength There has also been proposed an elastic crawler in which a protector for covering the outer peripheral end of the code string from the crawler outer peripheral side is embedded (Patent Document 2).
JP-A-3-295576 JP 2001-55182 A

The elastic crawlers proposed in Patent Document 1 and Patent Document 2 have a higher rigidity compared to the other portions where the tensile bodies overlap, and when circulating through the drive wheels, etc. It is easy to get injured when riding and receiving external force.
In addition, in the process of making the belt-like elastic crawler into an endless band, that is, the process of overlapping the ends of the tensile body and vulcanizing the rubber material, the overlapping part of the tensile body is compared with the other parts. Since the rubber volumes on the outer peripheral side and the inner peripheral side are different, biasing or flow of the tensile body is likely to occur during processing, and sufficient durability may not be obtained.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an elastic crawler excellent in durability by suppressing the movement of overlapping portions of tensile bodies during traveling.

In order to achieve the above object, the present invention takes the following technical means.
That is, the elastic crawler according to the present invention includes a crawler main body formed in an endless belt shape by an elastic body, and a resistance formed in a belt shape by a plurality of tensile strength cords and overlapped in the vicinity of both ends in the longitudinal direction and embedded in the crawler main body. A tension body and a woven cord in which the cord is knitted in a net shape, and the woven cord is positioned on the grounding surface side of the overlapping portion in the vicinity of both ends of the tensile body, and is in the longitudinal direction of the overlapping portion The crawler body is embedded in the crawler body so as to cover all and a part including the whole width direction or a part including the outer edge in the width direction and protrude beyond the outer edge in the width direction by 10 mm or more from the outer edge in the width direction.

An elastic crawler includes a second woven cord in which the cord is knitted in a net shape, and is sandwiched between overlapping portions in the vicinity of both ends of the tensile body, and includes the entire longitudinal direction of the overlapping portion and an outer edge in the width direction. It can be configured such that it partially overlaps and protrudes 10 mm or more outward in the width direction from the outer edge in the width direction of the overlapped portion and is embedded in the crawler body.
Further, the elastic crawler is arranged such that the third woven cord in which the cord is knitted in a net shape is located on the opposite side to the grounding surface side of the overlapping portion in the vicinity of both ends of the tensile body, and the longitudinal direction of the overlapping portion The whole part and a part including the outer edge in the width direction may be covered, and it may be configured to be embedded in the crawler body by protruding 10 mm or more outward in the width direction from the outer edge in the width direction of the overlapped portion. .

  In the elastic crawler manufacturing method according to the present invention, a plurality of lugs project at a predetermined regularity in the longitudinal direction on the grounding surface side, and a tensile body formed in a strip shape by a plurality of tensile cords outwards at both ends. Create a belt-shaped crawler made of rubber embedded in a protruding state, overlap the ends protruding outward of the tensile body in a bonding mold, and weave the cord in a net shape The cord covers the entire length of the overlapped portion and the entire width direction or a part including the outer edge in the width direction on the ground contact surface side of the overlapped portion of the tensile body, and the woven cord is covered with the overlapped portion. These are arranged so as to protrude 10 mm or more outward in the width direction from the outer edge in the width direction, and a vulcanization process is performed by filling unvulcanized rubber into a space portion in the bonding mold.

Further, the second woven cord in which the cord is knitted in a net is overlapped between the overlapping portions in the vicinity of both ends of the tensile body and a part including the entire longitudinal direction of the overlapping portion and the outer edge in the width direction. And the second woven cord is disposed so as to protrude 10 mm or more outward in the width direction from the outer edge in the width direction of the overlapped portion, and is unvulcanized in the space portion in the bonding mold. The rubber can be filled and vulcanized.
Further, the third woven cord in which the cord is knitted in a net-like shape is positioned on the side opposite to the grounding surface side of the overlapping portion in the vicinity of both ends of the tensile body so that the entire longitudinal direction and the width direction of the overlapping portion And the third weaving cord is arranged so as to protrude 10 mm or more outward in the width direction from the outer edge in the width direction of the overlapped portion, and the space in the joining mold The portion may be filled with unvulcanized rubber and vulcanized.

  In the above description, the “woven cord in which the cord is knitted in a net shape” refers to a woven cord in which a metal cord, an organic fiber cord, an inorganic fiber cord, or the like is knitted in a net shape.

  According to the present invention, it is possible to provide an elastic crawler excellent in durability by suppressing the movement of overlapping portions of the tensile bodies during traveling.

First, the crawler type traveling device 2 to which the elastic crawler 1 is attached will be described.
FIG. 1 is a front view of the crawler type traveling device 2.
In FIG. 1, a crawler type traveling device 2 includes driving sprockets (driving wheels) 3 provided on both sides in either of the front and rear in the traveling direction, and idlers ( Rolling wheel 4, a plurality of rolling wheels 5, 5, 5, 5 provided on both sides, and an elastic crawler 1 wound around these drive sprockets 3 on both sides.

The drive sprocket 3 has a plurality of teeth 6,..., 6 on the outer periphery, and is rotated by a power device in the crawler type traveling device 2. The drive sprocket 3 engages teeth 6,..., 6 with engagement holes 7,..., 7 of the elastic crawler 1 to be described later, and circulates and moves the elastic crawler 1 in the circumferential direction. 2 for running.
The idler 4 rotates freely without being connected to a power unit or the like, and the wound elastic crawler 1 is turned back to enable circulation movement in the circumferential direction.
A plurality of rolling wheels 5 are provided below the crawler traveling device 2 in the front-rear direction. The rollers 5, 5, 5, 5 are all freely rotated, and the crawler type traveling device 2 is caused to travel by causing the elastic crawler 1 to contact the ground.

FIG. 2 is a cross-sectional view in the width direction of the elastic crawler 1 according to the present invention, and FIG. 3 is a schematic view of the structure of the elastic crawler 1 taken along the line AA in FIG. 2 is a cross-sectional view taken along the line BB in FIG. 2 and 3, the cross section hatching of the crawler body 8 is omitted.
In the following description, the inner side of the elastic crawler 1 when it is wound around the drive sprocket 3 and the idler 4 is referred to as “inner peripheral side”, and the outer side that is the contact surface side is referred to as “outer peripheral side”. Further, the direction in which the elastic crawler 1 circulates when the crawler type traveling device 2 travels is referred to as “circumferential direction”, and the horizontal direction orthogonal to the circumferential direction at this time is referred to as “width direction”.

2 and 3, the elastic crawler 1 includes a crawler body 8, cored bars 9,... 9, lugs 10, 10, 10, tensile bodies 11 and 11, thick weave cords 12 and 12, and the like. .
The crawler main body 8 forms a base portion of the elastic crawler 1 formed in an endless belt shape. The crawler body 8 is provided with a plurality of engagement holes 7 that pass through the inner surface 13 and the outer surface (surface on the grounding side) 14 of the crawler body 8 at equal intervals over the entire circumference in the center in the width direction.
The cored bar 9 is formed of a hard material such as metal. The cored bar 9 is embedded in the crawler body 8 with the longitudinal direction perpendicular to the circumferential direction of the crawler body 8 between the adjacent engagement holes 7, 7. The core 9 is formed in a central portion 15 that occupies the center in the width direction of the crawler main body 8 (hereinafter may be abbreviated as “width direction”) and from both sides in the width direction of the central portion 15 toward the lateral ends of the crawler main body 8. A pair of core metal projections 17 and 17 aligned in the width direction and projecting outward from the inner surface 12 side of the crawler body 8 from the vicinity of the boundary between the extended wing portions 16 and 16 and the wing portions 16 and 16 in the central portion 15. Consists of.

The metal core protrusions 17 and 17 are engaged with the drive sprocket 3, the idler 4, and the rollers 5, 5, 5, and 5, thereby preventing the elastic crawler 1 from falling off during traveling.
On the outer surface 14 of the crawler body 8, a plurality of lugs 10 projecting outward at positions overlapping the core metal 9 are provided at equal intervals over the entire circumference. The lug 10 extends perpendicularly to the circumferential direction from one edge in the width direction as a starting point to before reaching the edge on the other side in the width direction. The lugs 10,..., 10 are arranged in the circumferential direction, with the width direction end edges serving as starting points being alternately changed.
The tensile body 11 includes a plurality of tensile cords 18,. The tensile body 11 is formed by arranging tensile strength cords 18,..., 18 in a line in the width direction. One tensile body 11 is provided between each of the engagement holes 7,..., 7 and both ends of the crawler body 8 in the width direction. Each of the tensile bodies 11, 11 has an end on the outer side in the width direction so that an end edge on the inner side in the width direction is located on the outer peripheral side of the center in the width direction of each core metal protrusion 17, 17. The rims 16 and 16 are wound around the outer peripheral side of the wings 16 and 16 so that the edges are slightly inside the outer ends of the wings 16 and 16 in the width direction. , 19 and 19 are overlapped with each other and are embedded in the crawler body 8 (FIG. 3).

The thick weave cord 12 is a cord in which steel cord, nylon cord, tetron cord, aramid fiber cord, glass fiber cord or the like is knitted in a net shape. The “thick weave” in the name “thick weave cord” does not mean that the thick weave cord 12 needs a certain thickness or more.
The thick weave cord 12 is cut into a strip shape and is arranged on the outer peripheral side of the overlapping portion of the tensile body 11 with the longitudinal direction being the circumferential direction. The thick weaving cord 12 overlaps with approximately one third of the width of the tensile body 11 in the width direction, and a predetermined width D protrudes outward from the tensile body 11 in the width direction. Embedded in the main body 8. The width D that the thick weave cord 12 protrudes from the tensile body 11 is preferably 10 mm or more as will be described later.

The thick weave cord 12 is provided for each of the tensile bodies 11 and 11. The thick woven cord 12 is longer than the overlapping length in the vicinity of both ends 19 and 19 of the tensile body 11 in the circumferential direction, and the protruding length S at both ends 19 and 19 of the overlapping portion is substantially equal. The protruding length S of the thick weave cord 12 in the circumferential direction is preferably equal to or larger than the protruding width D of the outer side in the width direction.
Next, a method for manufacturing the elastic crawler 1 will be described.
FIG. 4 is a schematic diagram showing a belt-like elastic crawler 1T before being formed into an endless belt-like shape, and FIGS. 5 and 6 are views showing a joining process of the belt-like elastic crawler 1T.

The belt-like elastic crawler 1T is formed by projecting the tension members 11 and 11 at both ends of the crawler body 8. The belt-like elastic crawler 1T is manufactured by a known method, for example, a method described in JP 2001-114144 A, JP 2004-345287 A, JP 2001-47436 A, or the like.
Referring to FIG. 5, both ends of the belt-like elastic crawler 1 </ b> T are joined using a joining mold 20. The joining mold 20 includes an inner peripheral mold 21 and an outer peripheral mold 22, and when these are brought into contact with each other, the same space as the outer shape of the elastic crawler 1T is formed. The inner peripheral mold 21 has a plurality of recesses 23,..., 23 provided at predetermined intervals in the longitudinal direction (left and right direction in FIG. 6). Then, the cored bar 9 is fitted. Further, the inner peripheral mold 21 is provided with convex portions 24,..., 24 for forming the engaging holes 7,..., 7 in the joint portion of the elastic crawler 1 between the adjacent concave portions 23, 23. It has been. A plurality of recesses 25,..., 25 for forming the lug 10 are provided in the outer peripheral side mold 22 at equal intervals in the longitudinal direction.

Each end of the belt-like elastic crawler 1 </ b> T is disposed at each end in the longitudinal direction of the inner peripheral mold 21 with the tensile bodies 11, 11 in the middle. At this time, the tensile bodies 11 and 11 projecting from the respective ends of the belt-like elastic crawler 1T are overlapped with a certain length L (FIG. 6A).
Subsequently, the strip-shaped thick woven cords 12 and 12 are overlapped on the overlapping portions of the tensile bodies 11 and 11 by approximately one third of the width of the tensile bodies 11 and 11, and the width direction of the tensile bodies 11 and 11 is increased. A predetermined width D protrudes outward from the outer edge, and is disposed on the tensile bodies 11 and 11 (FIG. 6B).
The inner peripheral side mold 21 and the outer peripheral side mold 22 are made of rubber R before vulcanization in the space after the core bars 9, 9, the tensile bodies 11, 11 and the thick weave cords 12, 12 are arranged. Filled and butted together, the inside of the joining mold 20 is heated and pressurized to join both ends of the belt-like elastic crawler 1T.

In the method of manufacturing the elastic crawler 1 according to the present invention, the strip-shaped thick weave cords 12 and 12 cover the overlapping portions of the tensile bodies 11 and 11 during the vulcanization molding, and the bias and flow of the tensile bodies 11 and 11 are prevented. It can be effectively suppressed. Moreover, the elastic crawler 1 manufactured in this way prevents the ingress of a wound when it receives an external wound because the thick weave cords 12 and 12 serve as a reinforcing body. It can delay the arrival of scratches and has excellent durability.
FIG. 7 is a cross-sectional view in the width direction of an elastic crawler 1B according to another embodiment.
The elastic crawler 1B includes a crawler main body 8, core bars 9, ..., 9, lugs 10, 10, tensile bodies 11, 11, thick weave cords 12Ba, 12Ba, 12Bb, 12Bb, and the like. The structure of the crawler main body 8, the core bars 9,..., The lugs 10, 10 and the tension members 11, 11 in the elastic crawler 1B is the same as that in the elastic crawler 1, and in FIG. The same reference numerals are given and the description thereof is omitted.

The material of the thick weave cords 12Ba,..., 12Bb is the same as that of the thick weave cord 12 in the elastic crawler 1. Thick weave cords 12Ba,..., 12Bb are provided at the portions where the ends of the tensile bodies 11, 11 are overlapped. The thick weaving cords 12Ba and 12Ba are arranged on the inner peripheral side of the respective tensile bodies 11 and 11 so as to be sandwiched between the tensile body and the core bars 9, ..., 9, and the thick weaving cords 12Bb and 12Bb are respectively It is arranged on the outer peripheral side of the tension bodies 11, 11.
The inner woven cord 12Ba on the inner circumferential side overlaps with about half the width of the tensile body 11 in the width direction, and a predetermined width D protrudes outward from the tensile body 11 in the width direction. It is buried in. The outer peripheral side thick weave cord 12Bb covers the entire outer peripheral side of the tensile body 11 overlapped in the width direction, and further, a predetermined width D protrudes outward in the width direction from the tensile body 11, and is embedded in the crawler body 8. ing.

The thick weaving cords 12Ba and 12Bb are longer than the overlapping length of the tensile body 11 in the circumferential direction like the thick weaving cord 12 in the elastic crawler 1, and the protruding lengths in the circumferential direction at both ends of the overlapping portion are substantially equal. . The protruding length of the thick weave cords 12Ba and 12Bb in the circumferential direction is preferably equal to or longer than the protruding width D on the outer side in the width direction. Thick weave cords 12Ba and 12Bb are provided for the tensile bodies 11 and 11 on both sides in the width direction.
The manufacturing method of the elastic crawler 1B is the same as the manufacturing method of the elastic crawler 1 except for the way in which the thick weave cords 12Ba,. In the elastic crawler 1 </ b> B, management is performed so that the extent of the outward protrusion of the tensile body 11 in the width direction is the width D on the cores 9,... 9 fitted in the recesses of the inner peripheral mold 21. Then, the thick weave cords 12Ba and 12Ba are arranged, and the tensile bodies 11 and 11 are overlaid thereon. Then, the thick weaving cords 12Bb and 12Bb are arranged on the superposed tensile bodies 11 and 11 so that the protruding width from the tensile bodies 11 and 11 outward in the width direction becomes the width D. . The space portion is filled with the rubber R before vulcanization, and the inner peripheral side mold 21 and the outer peripheral side mold 22 are combined and joined by vulcanization molding.

FIG. 8 is a cross-sectional view in the width direction of an elastic crawler 1 </ b> C having no cored bar according to the present invention.
The elastic crawler 1C includes a crawler main body 8C, lugs 10Ca and 10Cb, a tensile body 11C, thick woven cords 12Ca, 12Ca, and 12Cb.
The crawler body 8C is formed in an endless belt shape, and has a pair of drive protrusions 26C and 26C protruding inward from the inner surface 13C near the center in the width direction. The drive protrusions 26C and 26C are provided at equal intervals over the entire circumferential direction. The drive projections 26C, 26C circulate the elastic crawler 1C by contacting the side surfaces in the circumferential direction with pins extending in the horizontal direction provided in the vicinity of the outer periphery of the drive wheels in the crawler type traveling device 2. Further, the drive protrusions 26C and 26C prevent the elastic crawler 1C wound around the drive wheel, the idler 4 and the rollers 5, 5, 5 and 5 of the crawler type traveling device 2 from dropping off during traveling. It also has a function.

On the outer surface 14C of the crawler main body 8C, lugs 10Ca that protrude outward and extend in the width direction and lugs 10Cb that are shorter than the lugs are alternately provided at equal intervals over the entire circumference. The lug 10Ca extends from one end in the width direction of the crawler body 8C to the other end, and the lug 10Cb has a length approximately half that of the lug 10Ca and is provided at a central portion in the width direction.
The tensile body 11C is formed by a plurality of tensile cords 18,..., 18 arranged in a line in the width direction and formed in a strip shape. One tensile body 11C having a width slightly smaller than the length of the short lug 10Cb is overlapped at both ends and embedded in the crawler body 8C. In addition, FIG. 8 is sectional drawing in the part on which the tension body 11C was piled up.

The thick weave cords 12Ca, 12Ca and 12Cb are formed of the same material as the thick weave cord 12 in the elastic crawler 1. Thick weave cords 12Ca, 12Ca, and 12Cb are provided at portions where the ends of the tensile body 11C are overlapped. The thick weave cords 12Ca and 12Ca are arranged on the inner peripheral side of the tensile body 11C, and the thick weave cord 12Cb is arranged on the outer peripheral side of the tensile body 11C.
The thick weave cord 12Ca on the inner peripheral side is overlapped in the width direction from the outer edge of the tensile body 11C to the base of the drive protrusion 26C in the inner direction, and has a predetermined width outward from the tensile body 11C. The width D protrudes and is embedded in the crawler body 8C. The thick woven cord 12Cb on the outer peripheral side covers all of the tensile bodies 11C that are overlapped in the width direction, and further protrudes outward from the tensile body 11C on both sides in the width direction, and is embedded in the crawler body 8C. ing.

The thick weaving cords 12Ca, 12Ca, 12Cb are longer than the overlapping length of the tensile bodies 11C in the circumferential direction, and the protruding lengths at both ends in the circumferential direction of the overlapping portions are substantially equal. The protruding length of the thick weave cords 12Ca, 12Ca, 12Cb in the circumferential direction is preferably equal to or longer than the protruding width D on the outer side in the width direction.
The manufacturing method of the elastic crawler 1C is to use a joining mold that does not have a core and does not have a recess for fitting the core into the inner peripheral side mold, and the thick woven cords 12Ca, 12Ca, and 12Cb. Except for the arrangement, it is the same as the manufacturing method of the elastic crawlers 1 and 1B. Also in the elastic crawler 1C, the thick weave cord 12Ca is arranged so that the extent of the outward protrusion in the width direction from the tensile body 11C is the width D, and the thick weave cord 12Ca is arranged thereon, and the tensile body 11C is superimposed thereon. Then, the thick weaving cord 12Cb is arranged on the superposed tensile body 11C so that the extent of the outward protrusion in the width direction from the tensile body 11C becomes the width D. The space portion is filled with the rubber R before vulcanization, and the inner peripheral side mold and the outer peripheral side mold are combined to perform joining by vulcanization molding.

Table 1 shows that in the elastic crawler 1 shown in FIG. 2, the elastic crawler 1 </ b> B shown in FIG. 7, and the elastic crawler 1 </ b> C shown in FIG. 8, the thick woven cords 12, 12 Ba, 12 Bb, 12 Ca, 12 Cb are tensile bodies 11. , 11, 11C, the relationship between the width D protruding outward and the degree of rubber peeling is examined. Here, “rubber peeling” refers to rubber peeling from the thick weave cords 12, 12Ba, 12Bb, 12Ca, 12Cb.
In Table 1, “Structure-I” refers to the elastic crawler 1, “Structure-II” refers to the elastic crawler 1B, and “Structure-III” refers to the elastic crawler 1C. is there.

In the tests of Table 1, the elastic crawlers 1, 1B, 1C each having a width of 300 mm and the elastic crawler with a core metal and the elastic crawler without a core metal having no thick weaving cord of 300 mm are actually used as the crawler type traveling device 2. This is a result of wearing and running.
“Evaluation of peeling” in Table 1 indicates the travel times in which abnormalities in appearance were recognized at the joint portions of the tensile bodies in the elastic crawler with a cored bar and the elastic crawler without a cored bar having no thick weave cord. Each of the elastic crawlers 1, 1 B, 1 C having the thick weave cords 12, 12 Ba, 12 Bb, 12 Ca, 12 Cb in Table 1 as the reference time in “Structure-I”, “Structure-II” and the reference time in “Structure-III” After the crawler type traveling device 2 to which the belt is mounted travels for a corresponding reference time, the elastic crawlers 1, 1B, 1C are disassembled and the degree of rubber peeling at the overlapping portions of the tensile bodies 11, 11, 11C Is determined visually.

From Table 1, the width D of the thick weave cords 12, 12Ba, 12Bb, 12Ca, 12Cb protruding outward from the tensile bodies 11, 11, 11C is 10 mm or more in any of the elastic crawlers 1, 1B, 1C. It turns out that there exists an effect which reduces peeling of the rubber | gum from the thick weave cord 12, 12Ba, 12Bb, 12Ca, 12Cb.
In addition, the reference time in the evaluation of Table 1 is a time when an abnormality in appearance is recognized in an elastic crawler not having a thick weave cord, so that the elasticity provided with the thick weave cord 12, 12Ba, 12Bb, 12Ca, 12Cb is provided. It can be said that all of the crawlers 1, 1B, and 1C are less likely to cause an appearance abnormality compared to an elastic crawler that does not have a thick weave cord.

9 and 10 are cross-sectional views in the width direction of elastic crawlers 1D to 1H, 1J having a cored bar according to another embodiment.
9 and FIG. 10, the configurations of the crawler body 8, the core bars 9,... 9, the lugs 10 and 10 and the tensile bodies 11 and 11 in each of the elastic crawlers 1 </ b> D to 1 </ b> J 9, the lugs 10,..., 10 and the tensile members 11, 11 are the same as those in the elastic crawler 1 in the following description and FIG.

The elastic crawler 1D shown in FIG. 9A is a thick weave cord 12Ba between the core bars 9,..., 9 and the overlapping portions of the tensile bodies 11 in the elastic crawler 1B shown in FIG. , 12Ba are not provided, and thick weave cords 12Bb, 12Bb are provided only on the outer peripheral side of the tensile bodies 11, 11.
An elastic crawler 1E shown in FIG. 9B includes a core bar 9 in addition to the thick weave cords 12 and 12 provided on the outer peripheral side of the tensile bodies 11 and 11 in the elastic crawler 1 shown in FIG. Thick weave cords 12 </ b> E and 12 </ b> E are also provided between the tensile body 11. The thick weave cord 12E is arranged so as to be plane symmetric with the thick weave cord 12 with the tensile body 11 as a symmetry plane. In FIG. 9B, the thick weaving cord having a width twice that of the thick weaving cord 12 in the elastic crawler 1 is folded in two to form a joining die so as to sandwich the outer end edge of the tensile body 11. It is accommodated and embedded in the crawler body 8.

The elastic crawler 1F shown in FIG. 9 (c) includes a tensile body 11 in addition to the thick woven cords 12 and 12 provided on the outer peripheral side of the tensile bodies 11 and 11 in the elastic crawler 1 shown in FIG. , 11 are also provided with thick weave cords 12F, 12F between the overlapping portions in the vicinity of their respective tips. The thick weaving cord 12F is embedded in the crawler body 8 so that the end in the width direction is overlapped with the inner end of the thick weaving cord 12 in the vertical direction in FIG.
An elastic crawler 1G shown in FIG. 10 (d) includes a core metal 9 and a thick metal cord 12, 12 provided on the outer peripheral side of the tensile bodies 11, 11 in the elastic crawler 1 shown in FIG. Thick weave cords 12E and 12E are provided between the tensile bodies 11, and thick weave cords 12F and 12F are provided between overlapping portions in the vicinity of the respective ends of the tensile bodies 11 and 11.

The thick weaving cords 12E and 12E and the thick weaving cords 12F and 12F are arranged in the crawler main body with respect to the thick weaving cords 12E and 12E and the thick weaving in the elastic crawler 1E described with reference to FIGS. 9B and 9C. It is the same as the codes 12F and 12F.
The elastic crawler 1H shown in FIG. 10 (e) includes a thick woven cord 12H between the cored bar 9 and the tensile members 11, 11 in addition to the thick woven cords 12Bb and 12Bb in the elastic crawler 1B shown in FIG. , 12H are provided. The thick woven cord 12H is arranged such that the end edge in the width direction inner side is located slightly inward from the center of the width of the tensile bodies 11 and 11.

The elastic crawler 1J shown in FIG. 10 (f) is formed between the overlapping portions in the vicinity of the respective distal ends of the tensile bodies 11, 11, in addition to the thick weave cords 12Bb, 12Bb in the elastic crawler 1B shown in FIG. Also, thick weave cords 12J and 12J are provided. The thick weaving cord 12J is arranged so that the end edge in the width direction is located slightly inward from the center of the width of the tensile bodies 11, 11.
The elastic crawlers 1D to 1H and 1J are different from the elastic crawlers 1 and 1B in the arrangement of the thick weave cords in the crawler main body 8, but like the elastic crawlers 1 and 1B, after manufacturing the belt-shaped elastic crawler 1T, It is manufactured by joining the tensile bodies 11, 11 protruding from both ends by a joining mold 20.

Each of the thick woven cords of the elastic crawlers 1D to 1H and 1J has a protruding length D of 10 mm from the outer edge of the overlapping portion of the tensile body 11 at the outer edge in the width direction. The crawler body 8 is embedded as described above. In addition, the thick weave cords in each of the elastic crawlers 1D to 1H and 1J are substantially equal in the protruding length at both ends 19 and 19 of the overlapped portion of the tensile body 11, and the protruding length is outward in the width direction. Is set equal to or greater than the protruding width D.
11 and 12 are cross-sectional views in the width direction of the elastic crawlers 1K to 1N and 1P having no cored bar according to another embodiment.

The configurations of the crawler main body 8C, lugs 10Ca, 10Cb and tensile bodies 11, 11 in each of the elastic crawlers 1K to 1N, 1P shown in FIGS. 11 and 12 are the same as those of the crawler main body 8C, lugs 10Ca, 10Cb, and anti-strength of the elastic crawler 1C. It is the same as the structure of the tension bodies 11 and 11, and shall attach | subject the code | symbol same as these in the elastic crawler 1C in the following description and FIG.
In the elastic crawler 1K shown in FIG. 11A, thick weave cords 12K and 12K are embedded in the vicinity of both end edges in the width direction of the tensile body 11C and on the outer peripheral side of the tensile body 11C. The thick weaving cords 12K and 12K both have a protruding length D of 10 mm or more from the edge in the width direction of the tensile body 11C and are equal to or slightly smaller than the protruding length D. It has a part which overlaps with the tension body 11C inward from the edge of the body 11C.

The elastic crawler 1L shown in FIG. 11 (b) does not have the thick woven cords 12Ca and 12Ca arranged on the inner peripheral side of the elastic crawler 1C shown in FIG. 8, and is tensile on the outer peripheral side of the tensile body 11C. The thick weave cord 12Cb covers the entire width direction of the body 11C.
The elastic crawler 1M shown in FIG. 11C is a thick woven cord having the same configuration as the thick woven cords 12K and 12K embedded in the outer peripheral side of the tensile body 11C in the elastic crawler 1K shown in FIG. 12K, 12K. Further, the elastic crawler 1M has a thick weaving on the inner peripheral side of the tensile body 11C, the protruding length D from the tensile body 11C outward and the overlapping degree with the tensile body 11C is equal to the thick weaving cords 12K and 12K. The cords 12M and 12M are provided on both sides in the width direction.

  The elastic crawler 1N shown in FIG. 12 (d) is a thick woven cord having the same configuration as the thick woven cords 12K and 12K embedded in the outer peripheral side of the tensile body 11C in the elastic crawler 1K shown in FIG. 11 (a). 12K, 12K. Furthermore, the elastic crawler 1N is provided with thick weave cords 12N and 12N between the overlapping portions in the vicinity of the tip of the tensile body 11C. The thick weaving cords 12N and 12N are both inside the crawler body 8C so that the inner edges in the width direction overlap the inner edges of the thick weaving cords 12K and 12K in the vertical direction in FIG. Buried.

  The elastic crawler 1P shown in FIG. 12 (e) has thick woven cords 12K and 12K embedded on the outer peripheral side of the tensile body 11C, and a thickness embedded between overlapping portions in the vicinity of the tip of the tensile body 11C. Thick weave cords 12M and 12M embedded in the inner peripheral side of the weave cords 12N and 12N and the tensile body 11C are provided on both sides in the width direction. The thick weaving cords 12K and 12K have the same configuration as the thick weaving cords 12K and 12K in the elastic crawler 1K shown in FIG. 11A, and the thick weaving cords 12N and 12N are shown in FIG. The thick weave cords 12N and 12N in the elastic crawler 1N have the same configuration, and the thick weave cords 12M and 12M have the same configuration as the thick weave cords 12M and 12M in the elastic crawler 1M shown in FIG. . Each of the thick weave cords 12K, 12N, and 12M on both sides in the width direction has a protruding length D of 10 mm or more from the edge in the width direction of the tensile body 11C, and is inward from the edge in the width direction of the tension body 11C. On the other side, it is embedded so as to overlap with the vicinity of the end edge of the tensile body 11C with a width equal to or slightly narrower than the protruding length D.

Each of the elastic crawlers 1K to 1N, 1P does not have a cored bar, and the arrangement of the thick woven cords in the crawler main body 8C may be different from the elastic crawlers 1, 1B, 1C. Similarly to 1C, a belt-like elastic crawler is manufactured, and then the tensile bodies 11, 11 protruding from both ends thereof are bonded by a bonding mold 20.
Each of the thick woven cords in each of the elastic crawlers 1K to 1N and 1P has a protruding length from the outer edge of the overlapping portion for joining the tensile body 11C at the outer edge in the width direction. It is embedded in the crawler body 8C so that the length D is 10 mm or more. In addition, the thick weaving cords in each of the elastic crawlers 1K to 1N and 1P are substantially equal in the protruding length at both ends of the overlapped portion of the tensile body 11C, and the protruding length is the protruding width outward in the width direction. It is made equal to or larger than the width D.

In the above-described embodiment, the present invention can be applied to elastic crawlers having different shapes and arrangements of the core metal 9, the lugs 10, 10Ca, 10Cb, the tensile members 11, 11C, the engagement holes 7, and the like.
In addition, each structure of elastic crawler 1,1B-1H, 1J-1N, 1P and elastic crawler 1,1B-1H, 1J-1N, 1P, or the whole structure, a shape, a dimension, a number, a material, etc. are this invention. It can be appropriately changed in accordance with the purpose.

  INDUSTRIAL APPLICABILITY The present invention can be used for an elastic crawler in a crawler type traveling device used for a civil engineering work machine, a construction working machine, an agricultural working machine, and the like.

FIG. 1 is a front view of the crawler type traveling device. FIG. 2 is a cross-sectional view in the width direction of the elastic crawler according to the present invention. FIG. 3 is a schematic diagram of the structure of the elastic crawler in the direction of arrows AA in FIG. FIG. 4 is a schematic view showing a belt-like elastic crawler before being formed into an endless belt-like shape. FIG. 5 is a view showing a joining process of a belt-like elastic crawler. FIG. 6 is a view showing a joining process of the belt-like elastic crawler. FIG. 7 is a cross-sectional view in the width direction of an elastic crawler according to another embodiment. FIG. 8 is a cross-sectional view in the width direction of an elastic crawler having no cored bar according to the present invention. 9 is a cross-sectional view in the width direction of an elastic crawler having a core bar according to another embodiment. FIG. 10 is a cross-sectional view in the width direction of an elastic crawler having a mandrel according to another embodiment. FIG. 11 is a cross-sectional view in the width direction of an elastic crawler having no cored bar according to another embodiment. FIG. 12 is a cross-sectional view in the width direction of an elastic crawler having no cored bar according to another embodiment.

Explanation of symbols

1, 1, 1B to 1H, 1J to 1N, 1P Elastic crawler 1T Band-shaped crawler (band-shaped elastic crawler)
8,8C Crawler body 10, 10Ca, 10Cb Lug 11, 11C Tensile body 12, 12Bb, 12Cb, 12K Weave cord (thick weave cord)
12F, 12J, 12N Second weave cord (thick weave cord)
12Ba, 12Ca, 12E, 12H, 12M Third weave cord (thick weave cord)
18 Tensile cord 20 Bonding die R Unvulcanized rubber (rubber before vulcanization)

Claims (6)

A crawler body formed in an endless belt shape by an elastic body;
A tensile body formed in a strip shape by a plurality of tensile cords and overlapped in the vicinity of both ends in the longitudinal direction and embedded in the crawler body,
A woven cord in which the cord is knitted in a net shape;
The weaving cord is
Covering a part including the entire longitudinal direction and the entire width direction of the overlapping part or the outer edge in the width direction, located on the grounding surface side of the overlapping part in the vicinity of both ends of the tensile body,
An elastic crawler characterized in that it protrudes 10 mm or more outward in the width direction from the outer edge of the overlapping portion in the width direction and is embedded in the crawler body. The second weaving cord, in which the cord is knitted in a net,
Sandwiched between overlapping portions in the vicinity of both ends of the tensile body, and overlaps the entire length of the overlapping portion and a part including the outer edge in the width direction,
The elastic crawler according to claim 1, wherein the elastic crawler protrudes 10 mm or more outward in the width direction from the outer edge of the overlapping portion in the width direction and is embedded in the crawler body. The third weaving cord, in which the cord is knitted in a net,
Covering a part including the entire longitudinal direction of the overlapped portion and the outer edge in the width direction on the opposite side of the grounded surface side of the overlapped portion in the vicinity of both ends of the tensile body,
3. The elastic crawler according to claim 1, wherein the elastic crawler protrudes 10 mm or more outward in the width direction from the outer edge in the width direction of the overlapping portion and is embedded in the crawler body. From the rubber embedded on the grounding surface side with a plurality of lugs protruding at intervals having a predetermined regularity in the longitudinal direction and formed in a band shape by a plurality of tensile cords with both ends protruding outward Create a strip crawler
Overlay the vicinity of both ends protruding outward of the tensile body in a bonding mold,
Covering a part of the overlapped portion of the tensile body in the longitudinal direction and the entire widthwise direction or a part including the outer edge in the widthwise direction by a woven cord in which the cord is knitted in a net shape; and The woven cord is arranged so that it protrudes 10 mm or more outward in the width direction from the outer edge in the width direction of the overlapped portion,
A method for producing an elastic crawler, comprising performing a vulcanization treatment by filling an unvulcanized rubber into a space portion in the bonding mold. The second weaving cord, in which the cord is knitted in a net,
Sandwiched between the overlapping portions near both ends of the tensile body so as to overlap the entire length of the overlapping portion and a part including the outer edge in the width direction,
And the second woven cord is arranged so that it protrudes 10 mm or more outward in the width direction from the outer edge in the width direction of the overlapping portion,
The method for manufacturing an elastic crawler according to claim 4, wherein the space portion in the bonding mold is filled with unvulcanized rubber and vulcanized. A third weaving cord with a braided cord,
Covering a part including the entire longitudinal direction of the overlapped portion and the outer edge in the width direction on the opposite side of the grounded surface side of the overlapped portion near both ends of the tensile body,
And the third woven cord is disposed so as to protrude beyond the outer edge in the width direction by 10 mm or more from the outer edge in the width direction of the overlapped portion,
The method for producing an elastic crawler according to claim 4 or 5, wherein the space portion in the bonding mold is filled with unvulcanized rubber and vulcanized.

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