JP2000177658A - Elastic crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the bendability in a winding part while reducing the vibration by forming, on the anti-grounding surface side of a crawler body, bending recessed parts laterally crossing the crawler body on both sides of a driving engagement hole. SOLUTION: Respective inner end portions 3A1, 3B1 of lugs 3A, 3B of laterally unsymmetric arrangement are situated on both sides of a driving engagement hole 2A on the lateral center side of a crawler body 2 in conformation to lateral run-off preventing projections 4A, 4B, and arranged laterally zigzag. The lateral lugs 3A, 3B are extended in V-shape from each inner end portion 3A1, 3B1 to the outside of the crawler body 2, and each extended end portion 3A2, 3B2 substantially covers each outer end of lateral wing parts 4C, 4D in a core metal 4. Bending recessed parts 2B, 2C laterally crossing the crawler body 2 on both sides of the driving engagement hole 2A are formed on the anti-grounding surface side of the crawler body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic crawler and is used for an infinite travel device such as a construction machine such as a backhoe and an agricultural machine such as a combine.

[0002]

2. Description of the Related Art Japanese Patent Publication No. Hei 5-79549 discloses that an engaging hole with a sprocket claw is provided at a predetermined interval in the center of the crawler body in the width direction, and a core is buried between the front and rear engaging holes. In a rubber crawler in which a large number of steel cords are aligned in the circumferential direction on the grounding side of the gold wings and buried in a left-right distribution pattern, a cladding lug is projected on the grounding side of the crawler body and two core metal wings are adjacent to each other. A rubber crawler having a shape sufficient to substantially cover the surface thereof, which is disposed so as to be distributed to the left and right from the center in the width direction of the crawler body, and wherein left and right lugs are provided at positions shifted by one pitch in the front and rear directions in the circumferential direction. Has been proposed (1 of the conventional example).

Further, Japanese Patent Publication No. Hei 8-29725 discloses that
`` The meshing engagement portion with the starting wheel and the metal core bar having the rolling rail surface of the rolling wheel are arranged in parallel in the strip direction at a pitch so as to mesh with all the teeth of the starting shaft teeth, and are adjacent to the center in the width direction. In the rubber crawler belt provided with the engagement engagement hole with the starting wheel between the cored bar, a lug provided on the grounding surface side, a widthwise central portion, and a branch portion that sequentially moves in the left and right direction from the widthwise central portion to the end surface. And a lug that is continuous over the entire length in the band-like direction, the branch portion is formed so as to straddle three or more core metal projection surfaces, and the left and right branch portions are arranged so as to be staggered with each other. Rubber crawler belt characterized by the following) (2 of the conventional example).

[0004]

SUMMARY OF THE INVENTION Conventional rubber crawlers and crawler tracks (hereinafter referred to as elastic crawlers) of the first and second examples.
Although all of them are useful as they are, there is a common problem that in any case, as the lug stiffness increases, the bendability of the winding portions of the driving wheels and the driven wheels deteriorates.

[0005] Poor bendability at the wrapping portion causes the problem that the engagement between the claw of the driving wheel and the driving engaging portion becomes insufficient, and the recirculation of the elastic crawler becomes uncertain. Which was a deadly task as an elastic crawler.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce the vibration as an elastic crawler while taking into consideration the arrangement of a cored bar and a lug, and to improve the flexibility at the winding portion. It is.

[0007]

According to the present invention, lugs 3A and 3B are formed in an endless band shape with an elastic material, are spaced apart in the longitudinal direction of the band, and are formed so as to protrude toward the grounding surface in a right and left distribution arrangement. In the crawler main body 2, the core metal 4 having left and right derailing prevention protrusions 4 </ b> A, 4 </ b> B or left and right rail protrusions 4 </ b> H, 4 </ b> I having rolling wheel passing surfaces 4 </ b> F, 4 </ b> G is spaced apart in the band longitudinal direction. An elastic crawler 1 having a driving engagement hole 2A formed between the metal cores 4 adjacent to each other in the width direction central portion of the crawler main body 2 in the width direction of the crawler body 2 and embedded therein. The following technical measures have been taken to achieve the objectives.

That is, in the elastic crawler according to the first aspect, the inner end portions 3A1 and 3B1 of the lugs 3A and 3B arranged in the left and right distribution arrangement are provided with the left and right derailing prevention projections 4A and 4B or the left and right rail projections 4H and 4I. Crawler body 2 corresponding to
Are located in the center in the width direction and laterally to the driving engagement holes 2A, and are arranged in a zigzag pattern on the left and right, and the left and right lugs 3A, 3B
Is the crawler body 2 from its inner end portions 3A1 and 3B1.
Is extended outward in the shape of an eight-shape and each of its extended end portions 3
A2 and 3B2 substantially cover the outer ends of the left and right wing portions 4C and 4D of the cored bar 4, and the crawler main body 2 is provided on the opposite side of the crawler main body 2 from the driving engagement holes 2A. The present invention is characterized in that bending concave portions 2B and 2C are formed so as to cross right and left.

By adopting such a configuration,
Lack of rigidity between the metal cores 4 is compensated for by forming protrusions of the left and right lugs 3A and 3B, so that the rigidity of the entire elastic crawler 1 can be made substantially uniform, and the fall of rolling wheels and the like can be prevented to reduce vibration. The bending at the winding portion is ensured by the bending concave portions 2B and 2C crossing the crawler body 2 from side to side, and the driving claw and the driving engaging hole 2A are surely engaged here. It is doing.

According to the present invention, in the elastic crawler 1 according to the first aspect, one of the left and right grounding surfaces of the inner end portions 3A1 and 3B1 of the left and right lugs 3A and 3B is in the band longitudinal direction. And the other one of the left and right is extended to the other in the longitudinal direction of the band, and is formed with long load-bearing portions FL and FR in the longitudinal direction of the band.
L and FR are arranged in a zigzag pattern on the left and right sides (claim 2).

By adopting such a configuration,
The body load when the rolling wheels and the like relatively roll can be reliably supported by the load bearing parts FL and FR, and vibration can be reduced while securing the traction force by the lugs 3A and 3B.

Further, the present invention provides the above-mentioned claim 1 or 2.
Left and right lugs 3A, 3B
The left and right lugs 3 are formed so that each of the grounding surfaces of the crawler body 2 has a surface form that is continuous in the band longitudinal direction when viewed from the side of the crawler body 2.
A and 3B are arranged in a figure eight shape (claim 3).

By adopting such a configuration,
The supporting force that the wheels and the like roll relatively and is supported on the ground,
By supporting the lugs 3A, 3B on the grounding surface that is continuous in the longitudinal direction of the band, vibration reduction is guaranteed.

According to the present invention, there is provided the elastic crawler 1 according to any one of claims 1 to 3, wherein the left and right lugs 3 are provided.
On the grounding surface side of the crawler body 2 located between the lugs adjacent to each other in the band longitudinal direction in A and 3B, bulging portions 6A and 6B cover the long side edges of the left and right wing portions 4C and 4D of the metal core 4. The bulges 6A and 6B are formed in a staggered manner,
It is characterized by being connected to the foot of A, 3B (claim 4).

By adopting such a configuration,
Rubber chips or the like, which are likely to occur at the long side edges of the core bar 4 embedded in the crawler body 2 at intervals in the band longitudinal direction, suppress the movement of the left and right wing portions 4C, 4D of the core bar 4 by the expansion portions 6A, 6B. This can be prevented.

Further, the present invention relates to the elastic crawler according to any one of claims 1 to 4, wherein the crawler body 2 is provided.
The core bar 4 embedded in the belt at intervals in the longitudinal direction of the belt is provided with lateral displacement prevention protrusions 7A and 7B which engage with each other to prevent lateral displacement of the adjacent core bars 4. The present invention is characterized in that laterally preventing protrusions 7A and 7B are provided with cut portions T which do not overlap each other at appropriate positions in the longitudinal direction (claim 5).

By adopting such a configuration,
This makes it easy to disassemble the elastic crawler 1 through the cutting portion T. In order to facilitate the determination of the cut site T, it is desirable to have a marker M (claim 6).

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B show a first embodiment of an elastic crawler 1 according to the present invention.
The lugs 3A, 3A are formed in an endless belt shape by an elastic material, are spaced apart in the longitudinal direction of the belt, and are arranged in a right and left distribution manner.
B is formed in the crawler body 2 having a ridge formed on the ground surface side.
The core metal 4 having the left and right wheel-release preventing protrusions 4A and 4B raised is buried at intervals in the band longitudinal direction.
A driving engagement hole 2A is formed at the center in the width direction of the crawler main body 2 and between the cores 4 adjacent to each other in the band longitudinal direction, and is formed at the front and rear ends of a track frame (not shown). The driving wheels and the driven wheels are respectively endlessly wound around the shafts, and the rolling wheels are arranged in a row on a track frame between the two wheels.

The inner end portions 3A1 and 3B1 of the lugs 3A and 3B in the left and right distribution arrangement are provided with left and right wheel release prevention protrusions 4A and 3B, respectively.
4B, the left and right lugs 3A and 3B are arranged in a staggered manner on the center side in the width direction of the crawler body 2 and on the side of the driving engagement hole 2A. 3A
1, 3B1, extending outwardly from the crawler main body 2 in an eight-shape, and each extended end portion 3A2, 3B2 substantially covers each outer end of the left and right wing portions 4C, 4D in the cored bar 4. On the side of the crawler body 2 opposite to the ground contact surface, bending concave portions 2B and 2C are formed on the left and right sides of the driving engagement hole 2A so as to cross the crawler body 2 in the left and right direction (band width direction).

The core 4 is made of a metal material or a hard resin material, and is formed by forging, casting, or the like. The bases in the left and right projections 4A and 4B are connected to each other by a connecting portion 4E. The portion 4E is substantially the driving engagement hole 2A.
The crawler body 2 is circulated in the longitudinal direction of the band by the engagement and disengagement of the claws of the drive wheels.

In the crawler body 2 on the ground contact side of the left and right wing portions 4C and 4D of the cored bar 4, a neutral surface (a surface on which compression and tension do not substantially act when the crawler body 2 is wound). ), Tensile members 5A and 5B made of a steel cord or the like are buried along the longitudinal direction of the band while being distributed to the left and right.

As described above, the inner body end portions 3A1 and 3B1 of the left and right lugs 3A and 3B correspond to the left and right protrusions 4A and 4B, respectively, so that the body load via the left and right protrusions 4A and 4B can be reduced. The portions 3A1 and 3B1 are securely carried by the portions 3A1 and 3B1, and the inner portions 3A1 and 3B1 are staggered to prevent excessive rigidity. Further, the left and right lugs 3A and 3B are connected to the respective inner portions 3A.
The left and right wing portions 4C, 4C,
The lowering of rigidity between the 4Ds is compensated by the formation of protrusions of the lugs 3A, 3B, and the outer ends of the left and right wings 4C, 4D of the metal core 4 are almost covered by the extending portions 3A2, 3B2. Thus, the movement of the wings 4C and 4D is suppressed to prevent the occurrence of cracks.

Further, the first type shown in FIGS.
The elastic crawler 1 in the embodiment of the present invention
Each of the grounding surfaces of the inner end portions 3A1 and 3B1 in A and 3B has one of the left and right 3A1 extending to one side (downward in the drawing) in the band longitudinal direction, and the other of the left and right 3B1 to the other in the band longitudinal direction ( The load-bearing portions FL and FR are elongated in the longitudinal direction of the belt and are extended upward (in the drawing), and the load-bearing portions FL and FR are arranged in a staggered left and right direction.
The width in the belt longitudinal direction of the ground contact surface is gradually narrowed (narrower) toward the extended end portions 3A2 and 3B2.

That is, in the lug 3A on the left side in FIG. 1B, the lower part of the wing portion 4C of the core 4 is set as the starting point of the grounding surface, whereas the lug 3B on the right side is the wing on the core 4 Since the center of the portion 4C is set as the starting point of the ground contact surface, the starting points of the lugs 3A and 3B are shifted in the longitudinal direction of the band on the left and right sides, whereby the left and right wing portions 4C and 4D of the cored bar 4 are shifted from the left and right lugs 3A. , 3B, and are arranged in an eight-shape at substantially the same angle on the left and right.
A and 3B are equivalent.

FIGS. 2 to 5 show an elastic crawler 1 according to the present invention.
Of the second embodiment, and the basic configuration is the same as that of the first embodiment described above.
Since the third embodiment is common to the embodiment, common parts are denoted by common reference numerals, and the following description will be made with a focus mainly on the differences.

The bases of the left and right protrusions 4A and 4B of the cored bar 4 extend in the longitudinal direction of the belt to prevent left and right lateral displacement prevention protrusions 7A and 4A.
7B are formed, and the lateral displacement prevention projections 7A and 7B are located between the core metals 4 adjacent to each other in the longitudinal direction of the band so as to engage with each other in the band width direction.

Although the lateral displacement preventing projections 7A and 7B can be formed between all the cores 4, the elastic crawler can be formed by not providing the lateral displacement preventing projections 7A and 7B at a predetermined circumferential interval. 1 is disassembled, which is advantageous because the cutting resistance by a cutting tool such as a saw blade can be reduced between the metal cores 4 not having the projections 7A and 7B (for details, see FIGS. 9 and 10). See below).

Further, left and right projections 4A and 4B of the cored bar 4 are provided.
In the second embodiment, one of the left and right protrusions 4A and 4B can be formed of the same rubber (elastic material) as the crawler body 2 in the second embodiment. The rubber projections and the metal core projections are arranged in a zigzag manner in the longitudinal direction of the band, and the projections are rubber projections. It is configured to be lower than the cored bar projection.

By adopting such a configuration,
This is advantageous because vertical vibrations caused by pitching at the left and right ends of the crawler body 2 when traveling on a rough road such as an inclined road can be advantageously suppressed.

Further, as shown in FIG. 5, the left and right lugs 3A and 3B have the right and left lugs 3A so as to be continuous in the band longitudinal direction when the crawler body 2 is viewed from the side. , 3B are arranged in an eight-shape so that the amplitude (vertical vibration) over the entire longitudinal direction of the crawler body 2 is reduced and the left and right lugs 3B are arranged.
On the grounding surface side of the crawler body 2 located between the lugs adjacent to each other in the band longitudinal direction in A and 3B, bulging portions 6A and 6B cover the long side edges of the left and right wing portions 4C and 4D of the metal core 4. The bulges 6A and 6B are formed in a staggered manner,
A and 3B are connected to the bases (see also FIG. 4).

With this configuration, the movement of the metal core wings 4C and 4D is suppressed while ensuring the earth discharging property between the adjacent lugs (earth discharging part) in the longitudinal direction of the left and right lugs 3A and 3B. This reduces the cause of cracks.

Also, as shown in FIG.
The angles θ1 and θ2 of A and 3B are the same, and the angles θ3 and θ4 are the same.

Further, as shown in FIG. 5, the top surfaces 4A-1 of the left and right projections of the cored bar 4 are advantageously tapered downward to reduce vibration.

FIGS. 6 to 8 show an elastic crawler 1 according to the present invention.
The third embodiment has the same basic configuration and operation as those of the first embodiment described above. Therefore, common portions are denoted by common reference numerals, and the following description will focus on the differences.

The core 4 embedded in the crawler body 2 at intervals in the longitudinal direction of the belt has left and right derailing prevention protrusions 4A,
4B, the rolling surfaces 4F of the straddling wheels located on both outer sides of each side.
Rail projections 4H and 4I having 4G are formed to protrude.

In the illustrated example, the left and right wheel-release preventing projections 4A,
4B, one of them is a rubber projection and the other is a metal core projection, and is alternately arranged on the left and right sides. Rail projections 4H and 4I are necks 8 having a semicircular cross section at the base of the projections 4A and 4B.
A, 8B are formed.

The bending recesses 2B and 2C have narrow grooves 9A and 9B with semicircular cross sections between the rail projections, and have wide and narrow grooves 9A and 9A at the outer ends of the narrow grooves 9A and 9B. 9B
It is constituted by substantially rectangular grooves 10A and 10B which are deeper.

Further, the left and right derailing prevention projections 4A and 4B and the left and right rail projections 4H and 4I are provided with left and right lugs 3A and 3B.
The right and left lugs 3 are covered with the inner end portions 3A1 and 3B1 and are arranged in a staggered left and right direction.
A and 3B are stretched in the shape of an figure of eight and are asymmetrical.

In the third embodiment, the left and right wheel-release preventing projections 4A and 4B can be configured as core bar projections on both the left and right sides. When any one of 4B is formed as a rubber projection, an engaging uneven portion is formed on the upper surface of the wing portions 4C and 4D of the cored bar 4, and the rubber protrusion is bonded to the engaging uneven portion by vulcanization or the like. It is desirable to combine.

FIGS. 9 and 10 show a fourth embodiment of the present invention, in which the protrusions 7A for preventing lateral displacement of the cored bar 4 embedded at intervals (core pitch) in the band longitudinal direction of the crawler body 4.
7B is an improved version of FIG. 7B, and since other configurations, functions and effects can be common to the above-described first to third embodiments, common portions are denoted by common reference numerals, and differences will be described below.

In FIGS. 9 and 10, the lateral displacement preventing projections 7A and 7B extending back and forth at the center and right and left of the cored bar 4 are provided.
The protrusions 7A, 7A, 7A, 7A, 7C are formed by cutting tools (hand jigsaws, steel cutters, etc.) over the entire width direction of the crawler body 4 as shown by the symbol T between the core metals 4 adjacent in the band longitudinal direction. 7B is formed with a short stretch length (including one that does not form projections at all).

That is, the core metal bars 4 embedded in the crawler main body 2 with a gap in the longitudinal direction of the belt are engaged with each other so as to prevent the adjacent metal core members 4 from shifting laterally.
A, 7B, and a cutting portion T in which the lateral displacement prevention projections 7A, 7B do not overlap each other at an appropriate position in the longitudinal direction of the crawler main body 2.

By forming this cleavage site T,
The cutting resistance when the elastic crawler 1 is dismantled or the like can be reduced.
３ to ／, and the cutting portion T can be provided at one position in the longitudinal direction of the crawler.
It is also possible to provide a plurality of locations at a fixed interval of 0 to 500 mm. With such a plurality of locations, the disassembled crawlers after cutting can be stacked and treated.

Since the core 4 is a buried part,
Since it is difficult to determine the cutting site T, it is desirable to provide a marker M that indicates the cutting site T.

Further, when the cut portion T is provided, the rigidity of the cut portion is reduced.
This can be compensated by forming 0A and 10B.

In each of the above-described embodiments, the left and right lugs 3A and 3B are desirably formed to have a trapezoidal cross section. At this time, the lug kick surface (which becomes a stepping surface and a towing surface in the forward direction) and the lug counter surface are formed. The rising angle of the kick surface (flank surface) can be the same angle for both, but by setting the lug kick surface to an angle close to vertical and the lug anti-kick surface to the angle of a gentle slope, the traction force is increased. It is advantageous that the soil discharging property can be improved while improving.

In the first and second embodiments, the top surfaces of the left and right wheel derailment preventing projections 4A and 4B may be used as rail surfaces for a middle brim rolling wheel or the like.

[0049]

As described above in detail, when the elastic crawler according to the present invention is used as an infinite traveling device, smooth bending at the winding portion while suppressing (reducing) vibration of the body (driver) is achieved. Can be secured.

[Brief description of the drawings]

1A and 1B show a first embodiment of an elastic crawler according to the present invention, wherein FIG. 1A is a cross-sectional view, and FIG.

FIG. 2 is a plan view of a second embodiment of the elastic crawler according to the present invention, which is on the side opposite to the ground contact surface.

FIG. 3 is a sectional view showing a second embodiment of the elastic crawler according to the present invention.

FIG. 4 is a plan view showing a second embodiment of the elastic crawler according to the present invention, which is on the grounding surface side.

FIG. 5 is a side view showing a second embodiment of the elastic crawler according to the present invention.

FIG. 6 is a plan view showing a third embodiment of the elastic crawler according to the present invention, which is on the grounding surface side.

FIG. 7 is a plan view of a third embodiment of the elastic crawler according to the present invention, which is on the side opposite to the ground contact surface.

FIG. 8 is a sectional view taken along line XX of FIG. 7, showing a third embodiment of the elastic crawler according to the present invention.

FIG. 9 is a plan view of a fourth embodiment of the elastic crawler according to the present invention, which is on the side opposite to the ground contact surface.

FIG. 10 is a sectional view of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler main body 2A Drive engagement hole 2B, 2C Bending recess 3A, 3B Left and right lugs 3A1, 3B1 Inner end portions of lugs 3A2, 3B2 Extension end portions of lugs 4 Core metal 4A, 4B Projection 4C, 4D Core metal wing 4H, 4I Rail projection

Claims (6)

[Claims] 1. A crawler body (2) formed of an elastic material in an endless band shape, having a space in the longitudinal direction of the band, and having lugs (3A) (3B) protrudingly formed on the grounding surface side in a left-right distribution arrangement. ), Left and right derailment prevention projections (4A) (4
B) or a core metal (4) having left and right rail projections (4H) and (4I) having rolling wheel passing surfaces (4F) (4G) protruding therefrom is buried at intervals in the band longitudinal direction. An elastic crawler (1) in which a driving engagement hole (2A) is formed between a core bar (4) adjacent to the crawler main body (2) in the width direction central direction in the width direction of the crawler body (2); Each of the inner end portions (3A1) and (3B1) of the lugs (3A) and (3B) in the left and right distribution arrangement are provided with left and right wheel release prevention protrusions (4).
A) Corresponding to (4B) or the left and right rail projections (4H) and (4I), they are located at the center in the width direction of the crawler body (2) and beside the driving engagement holes (2A), and are staggered left and right. The left and right lugs (3A) and (3B) are extended from the respective inner end portions (3A1) and (3B1) to the outside of the crawler body (2) in a figure-eight shape, and the respective extended ends thereof Site (3A
2) (3B2) are left and right wings (4) of the cored bar (4).
C) Each outer end of (4D) is almost covered, and a driving engagement hole (2) is formed in the crawler body (2) on the side opposite to the ground contact surface.
An elastic crawler, characterized in that bending crevice (2B) (2C) which crosses the crawler body (2) left and right on the left and right of A). 2. One of the left and right lugs (3A) and (3B) of each inner end portion (3A1) (3B1) is extended to one of the left and right lugs in the longitudinal direction of the band, and the other of the left and right is Is extended in the other direction of the belt longitudinal direction to form a long load-bearing portion (FL) (FR) in the longitudinal direction of the belt, and the load-bearing portions (FL) (FR) are arranged in a staggered left and right direction. The elastic crawler according to claim 1, wherein 3. The left and right lugs (3A) so that each of the grounding surfaces of the left and right lugs (3A) and (3B) has a surface form that is continuous in the band longitudinal direction when the crawler body (2) is viewed from the side.
The elastic crawler according to claim 1 or 2, wherein (3B) is arranged in a figure eight shape. 4. The left and right wings (4C) of the cored bar (4) are provided on the grounding surface side of the crawler body (2) located between the lugs adjacent to each other in the band longitudinal direction in the left and right lugs (3A) (3B). ) (4D) to cover the long side of the bulge (6A) (6
B) are formed in a zigzag pattern on the left and right sides, and the bulges (6A) and (6)
The elastic crawler according to any one of claims 1 to 3, wherein B) is connected to a foot of the lug (3A) (3B). 5. A core metal (4) embedded in the crawler body (2) with a gap in the longitudinal direction of the band adjacent to the core metal (4).
To prevent lateral displacement of the crawler body (2). The lateral displacement preventing projections (7A) and (7B) overlap with each other at an appropriate position in the longitudinal direction of the crawler body (2). The elastic crawler according to any one of claims 1 to 4, further comprising a cutting portion (T) that does not fit. 6. A marker (M) for displaying a cutting site (T) corresponding to the cutting site (T).
An elastic crawler as described.