JPH07117740A - Resilient crawler - Google Patents

Abstract

PURPOSE:To perform compressive deformation at the inner circumferential surface side of a crawler easily by forming a deep groove in length ranging from the side of an engaging hole to the almost blade part outer end of a core bar, in the position of a crawler innercircumferential surface corresponding to an interval between two core bars on which a lag straddles. CONSTITUTION:A groove 9 extending outward right and left is formed at the side of an inner circumferential surface 8 of a crawler body 2, and this groove 9 has a long groove 9A and a short groove 9B which is used to prevent any crushing by projections 15 and 16, and situated in a position uncorresponding to a lag 7 at the side of an outer circumferential surface 6. The long groove 9A is situated in a position corresponding to the lag 7 and it aims at the facilitation of bending of the crawler body 2 in addition to the crush prevention by the projections 15 and 16. This long groove 9A is almost in the same depth as the groove 9B, and it has a groove bottom surface almost in parallel with a tension member 5. Its length L is made in a range from an engaging hole 3 to an intermediate position between an end of the groove 9B and an outer end of a blade part 4A, and the outer end is continued smoothly from the groove bottom surface to the inner circumferential surface 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic crawler used in a tracked vehicle for construction, civil engineering, agriculture and the like.

[0002]

2. Description of the Related Art For example, an elastic crawler for changing shoes, which is useful for replacing an iron crawler, is provided in a crawler body made of an elastic material at regular intervals in the crawler circumferential direction (hereinafter referred to as the circumferential direction). A core metal is embedded, an engagement hole for engaging a drive sprocket is formed between each core metal, and a pair of left and right (crawler width direction) protrusions are formed on each core metal so as to project to the inner peripheral side, and each outer peripheral surface is formed with a protrusion. A lug is integrally formed at the position corresponding to the core metal, and the top surface of the protrusion is a wheel passage surface through which the drive wheels, rolling wheels, etc. pass.

By the way, in a large-scale civil engineering work machine, the pitch of the cored bar is made small so that the projection surfaces of the wings of the two cored bars are substantially covered with lugs, and the left and right lugs are shifted by half a pitch in the circumferential direction. Thus, there is one that is improved in durability (JP-A-1-208288).

[0004]

In the above-mentioned prior art, since the lug has a circumferential length that covers two cored bars, the bending resistance between the cored bars covered by the lugs increases dramatically,
It becomes difficult to smoothly wind around the driving wheels, resulting in loss of horsepower and poor fuel economy, resulting in poor running performance. In addition, the elongation of the lug is increased when the crawler is bent, cutting scratches are easily formed on the lug, and it is difficult to expect substantial improvement in durability. Further, if the lugs are arranged in a staggered arrangement and the rigidity of the lugs is high, there is a problem that the difference in left and right rigidity at the same position in the circumferential direction is large and vibration is likely to increase.

A first object of the present invention is to provide a length from an engagement hole side to a substantially outer end of a wing portion of a core bar at a position of an inner peripheral surface of a crawler corresponding to a space between core bars over which a lug is straddled. The purpose of the present invention is to provide an elastic crawler in which a deep groove is formed to facilitate compression deformation on the inner peripheral surface side of the crawler body. A second object of the present invention is to provide an elastic crawler in which left and right lug corresponding grooves are arranged in a zigzag pattern in the circumferential direction so that rigidity in the circumferential direction can be made uniform.

A third object of the present invention is to provide an elastic crawler in which a raised bottom portion is formed at a midway portion in the longitudinal direction of a lug-corresponding groove to prevent an excessive decrease in rigidity during the groove.

[0007]

The first concrete means for solving the problems in the present invention is to form the engaging holes 3 for engaging the drive wheels in the crawler body 2 made of an elastic material at equal intervals in the circumferential direction,
The core metal 4 is embedded in the crawler body 2 between the engagement holes 3 in the circumferential direction, and the tensile member 5 in the circumferential direction is embedded on the outer peripheral side of the right and left wing portions 4A of the core metal 4, thereby An elastic crawler having an outer peripheral surface 6 integrally formed with a lug 7 having a length W in the circumferential direction extending over a plurality of cored bars 4.
The groove 9 formed between the metal cores 4 of the inner peripheral surface 8 on the left and right sides from the side of the engaging hole 3 has a groove 9A corresponding to the lug 7.
The length L is longer than the groove 9B that does not correspond to and is within the outer end of the blade portion 4A of the cored bar 4.

A second concrete means for solving the problem in the present invention is that, in addition to the first concrete means, the left and right lug corresponding grooves 9A are arranged in a staggered manner in the circumferential direction. A third concrete means for solving the problem in the present invention is that the lug corresponding groove 9A has a bottom raised portion 10 at a midway portion in the longitudinal direction in addition to the first or second concrete means.

[0009]

When the elastic crawler 1 is wound around the driving wheel or the like through the engagement hole 3, the elastic crawler 1 is bent and deformed in an arc shape along the driving wheel. At that time, the crawler main body 2 receives bending resistance such that the outer peripheral surface 6 extends around the tensile body 5 and the inner peripheral surface 8 contracts, and if the compression on the inner peripheral surface 8 side is small, the reaction force is exerted on the tensile body 5. To give a weighted extension force to the lug 7 on the outer peripheral surface 6 side.

When the lug 7 has a length W in the outer circumferential surface 6 of the crawler body 2 that extends over a plurality of cored bars 4, the lug 7 corresponds to only one cored bar 4. Rigidity of the lug 7 and the outer peripheral surface 6 side of the crawler body 2 is higher than that of the claw body 2 which makes it difficult to smoothly bend the crawler body 2, but a long groove 9A corresponding to the lug 7 is formed. By doing so, the amount of elastic body to be compressed on the inner peripheral surface 8 side decreases, and the inner peripheral surface 8 side of the crawler body 2 is deformed such that the lug corresponding groove 9A becomes thin, and the tensile body 5 and the lug 7 are formed. The force to stretch the wire is reduced.

When the left and right lug-corresponding grooves 9A are arranged in a zigzag pattern in the circumferential direction, the lug-corresponding grooves 9 are provided on either the left or right side between all the cored bars 4.
A is formed, and the lug non-corresponding groove 9B is formed at a position opposite to A.
Are arranged, and the bending deformation becomes substantially the same over the entire circumference of the crawler body 2. The bottom raised portion 10 in the middle of the lug corresponding groove 9A in the longitudinal direction has a lug corresponding groove 9A.
The decrease in rigidity caused by forming the is suppressed as much as possible.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIGS. 1 to 6, 1 is an elastic crawler, which is wound around a wheel 14 such as a sprocket drive wheel, a driving wheel, and a plurality of rolling wheels. The elastic crawler 1 includes a crawler main body 2 made of an elastic material such as rubber and synthetic resin, and a cored bar 4 made of metal or synthetic resin embedded at equal intervals in the crawler circumferential direction A. A pair of left and right circumferential tension members 5 made of steel or the like are embedded on the outer circumference (grounding surface) side of the cored bar 4 corresponding to the left and right wing portions 4A of the crawler main body 2 in the center in the left and right direction or Engagement holes 3 for engaging the drive wheels are formed in the vicinity thereof and between the cored bars 4, and a lug 7 having a circumferential length W extending over the two cored bars 4 is formed on the outer peripheral surface 6 of the crawler body 2. Is integrally molded.

Each of the cored bars 4 has a pair of left and right protrusions 15,
16 is integrally molded and is formed to project toward the inner peripheral surface 8 side of the crawler body 2. The top surfaces of the projections 15 and 16 serve as a flat wheel passage surface 17 on which wheels 14 such as rolling wheels roll. ing. In each core metal 4, the left and right wing portions 4A are located at the same position in the circumferential direction A, while the left and right protrusions 15 and 16 are circumferentially A.
Are formed so as to be offset in opposite directions and point-symmetrical.

The left and right protrusions 15 and 16 are arranged in the circumferential direction A.
Has a pair of front and rear guide protrusions F and R, and a gap U between the front and rear guide protrusions F and R is a guide protrusion gap.
The valley U between the guide protrusions of one of the protrusions substantially overlaps with one of the front and rear guide protrusions F and R of the other protrusion in a side view. Reference numeral 18 denotes an elastic protrusion formed in the valley U between the guide protrusions of the protrusions 15 and 16 of the cored bar 4. The elastic protrusion 18 is made of the same material as the crawler body 3 or an elastic material having a higher hardness than that of the crawler body 3. It is integrally formed with the main body 2, and the top portion thereof slightly projects from the wheel passage surface 17.

The lug 7 has an engaging hole 3 as shown in FIGS.
Are arranged in a left-right manner around the center and in a zigzag pattern in the circumferential direction A. Each of the lugs 7 has a circumferential length W1 on the inside and a circumferential length W2 on the outside that is shorter than that, and has a block shape that tapers to the left and right outwards. No. 4 wing 4A, and its base has a shape that covers the projection surfaces of two wing 4A by 40 to 80%.

The center of the left and right lugs 7 in the circumferential direction A is the right lug 7.
Is displaced from the center of the engagement hole 3 by a dimension S, the left lug 7 is displaced from the center of the engagement hole 3 by a dimension S, and the lug pitch of the lug 7 in the circumferential direction A is P1. P2 and P2 are arranged alternately. The ratio of the lug pitches P1 and P2 is P1 / P2 = 1.1 to 2.0 and 1.2 to
The range of 1.4 is preferable, and compared with the case of equal pitch, the amplitude of the vibration is not so different, but the cycle is longer and the riding comfort is improved.

The outer peripheral surface 6 of the crawler body 2 between the lugs 7
Is formed with a padding portion 20 for improving the lug strength on the base side of the lug 7, and a side reinforcing portion 21 that is further raised than the padding portion 20 is formed on the outer side.
Connects the bases of the front and rear lugs 7 and connects with the wings 4A.
The wrapping is performed to prevent damage or uneven wear of the side portion of the crawler body 2 due to the outer end of the blade portion 4A.

An elastic projection 23 is formed integrally with the lug 7 on the outer peripheral surface 6 side of the core metal 4 between the engagement holes 3, and the elastic projection 23 reinforces the core metal 4. Therefore, both in the front view shown in FIG. 1 and in the side view shown in FIG. 5, the trapezoid is formed into an inverted trapezoid, and the shape itself is not damaged by the drive wheels or the like. This elastic projection 23 is thicker than the lug 7 but thicker than the conventional one, and is built up on the cored bar 4, and the cored bar 4 is exposed due to friction or external damage, and a rubber chip is generated from that part. 5 is not exposed and the durability of the elastic crawler 1 is improved.

On the inner peripheral surface 8 side of the crawler body 2, a groove 9 is formed between each core metal 4 and extends from the engagement hole 3 side to the left and right outside. Originally, this groove 9 is to be deleted in advance so that the elastic body between them is not crushed by the front and rear projections 15 and 16 when the elastic crawler 1 is bent. The groove 9 has a long groove 9A and a short groove 9B,
The short groove 9B is for preventing crushing by the protrusions 15 and 16, and is formed at a position that does not correspond to the lug 7 on the outer peripheral surface 6 side. On the other hand, the groove 9A is formed at a position corresponding to the lug 7, and the crawler main body 2 is easily bent in addition to the crush prevention by the protrusions 15 and 16.

The lug corresponding groove 9A has substantially the same depth as the groove 9B, has a groove bottom surface substantially parallel to the tensile body 5, and the distance from the tensile body 5 to the groove bottom surface is from the tensile body 5 to the outer periphery. The distance to the surface 6 is substantially the same as or slightly longer than the distance to the surface 6, and the length L is determined by the engagement hole 3
To an intermediate position between the end of the groove 9B and the outer end of the blade portion 4A, and the outer end thereof smoothly continues from the groove bottom surface to the inner peripheral surface 8.

In the elastic crawler 1, it is possible to dispose two or more cores 4 between the engagement holes 3, and the lug 7 is formed so as to straddle 3 or 4 cores 4. In that case, a plurality of grooves 9A corresponding to the lugs 7 are formed between the cored bars 4, and when the lugs 7 are arranged in a staggered manner, the plurality of grooves 9A as one set are also arranged in a staggered manner. . 7 to 9 show a second embodiment of the present invention, in which the lug corresponding groove 9A reaches from the engagement hole 3 to the outer end of the blade portion 4A, and the length L of the groove 9A is the same as in the first embodiment. It is longer and the crawler body 2 is easier to bend. Since the groove 9A is deep and long, the raised bottom portion 10 is formed at a midway portion in the longitudinal direction thereof to prevent excessive decrease in rigidity of the portion of the crawler body 2 where the groove 9A is formed.

Further, in this second embodiment, the center of each lug 7 is on the center of the engaging hole 3, and the left and right lugs 7 are displaced in the circumferential direction A by the distance between the engaging holes 3 in the circumferential direction A. The lag pitch is P1 = P2. 10 to 16 are lug-corresponding grooves 9
The modification of A and a part of crawler main body 2 is shown.

The lug corresponding groove 9A of the first modified example of FIG.
The depth is approximately the same as the non-lug corresponding groove 9B, the length L is up to the middle of the tip of the groove 9B and the outer end of the blade portion 4A, and the inner peripheral surface 8 of the crawler body 2 is provided with the extended position of the lug corresponding groove 9A. Shallow groove 26
Is formed, and a reinforcement padding portion 27 is formed at the outer end of the inner peripheral surface 8 over the entire circumference of the crawler body 2. The crawler main body 2 secures the rubber gauges on the left and right side portions by not forming the lug-corresponding grooves 9A to the left and right side ends. However, by providing the reinforcing pad portion 27, a larger rubber gauge is secured, The torsional rigidity and lateral rigidity have been increased to improve the resistance to derailing.

The lug corresponding groove 9A of the second modified example of FIG.
The depth is deeper than the lug non-corresponding groove 9B, the length L is slightly longer than the middle of the tip of the groove 9B and the outer end of the blade portion 4A, and the inner peripheral surface 8 of the crawler body 2 is shallow at the extended position of the lug corresponding groove 9A. Groove 2
6 is formed. In the lug-corresponding groove 9A of the third modified example of FIG. 12, a bottom raised portion 10 is formed on the bottom surface of the groove at substantially the same position as the tip of the non-lug-corresponding groove 9B, and a downwardly inclined surface is formed from the apex thereof toward the tip side to engage. It is an arcuate recess toward the hole 3 side, the downwardly inclined bottom surface is formed substantially parallel to the inner peripheral surface 8, and the length is up to the vicinity of the outer end of the blade portion 4A.

The lug corresponding groove 9A of the fourth modified example of FIG.
The lug-corresponding groove 9A of the third modified example is formed so that the arcuate recess is eliminated and the bottom surface is inclined downward from the apex of the raised bottom portion 10 toward the engagement hole 3 side. The lug corresponding groove 9A of the fifth modified example of FIG. 14 is substantially parallel to the tensile body 5, is formed deeper than the non-lug corresponding groove 9B, and has a length up to the vicinity of the outer end of the blade portion 4A. .

The lug corresponding groove 9A of the sixth modified example of FIG.
The groove 9B is formed deeper than the lug non-corresponding groove 9B, and gradually becomes shallower from the engagement hole 3 side to the tip side. The lug-corresponding groove 9A of the seventh modified example of FIG. 16 is substantially the same as that of the first modified example of FIG. 10, but is formed up to a position where the reinforcing padding portion 27 overlaps the outer end of the blade portion 4A. .

The present invention is not limited to the above embodiment, but can be variously modified. For example, various combinations of the length, depth, groove bottom shape, bottom raised portion 10, reinforcing padding portion 27, etc. of the lug-corresponding groove 9A in the above-described embodiments and modifications can be made, and the pattern of the lug 7 can also be, for example, left and right. The lug 7 can be formed into a continuous shape or the like via the elastic protrusion 23.

[0028]

According to the present invention described in detail above, the groove 9 formed between the metal core 4 of the inner peripheral surface 8 of the crawler body 2 from the engagement hole 3 side to the left and right outside corresponds to the lug 7. The groove 9A that is formed is longer than the groove 9B that does not correspond to the lug 7 and the blade portion 4 of the core metal 4 is formed.
Since the length L is within the outer end of A, even if the lug 7 has a circumferential length that extends over a plurality of cored bars 4, compression deformation on the inner peripheral surface 8 side of the crawler body 2 is prevented. As a result, the driving wheels can be smoothly wound, the traveling performance can be improved, the lug 7 is less damaged, and the durability can be substantially improved.

Further, since the left and right lug-corresponding grooves 9A are arranged in a staggered manner in the circumferential direction, the difference in left and right rigidity at the same circumferential position of the elastic crawler can be reduced, and vibration and derailing can be prevented. Further, since the lug-corresponding groove 9A has the raised bottom portion 10 at a midway portion in the longitudinal direction, even if the groove 9A is formed long and deep,
It is possible to suppress a decrease in rigidity on the way to a low level, facilitate compression deformation, and maintain sufficient durability.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention and is taken along line XX of FIG.
It is sectional drawing equivalent to a line cross section.

FIG. 2 is an inner peripheral view of the same.

FIG. 3 is an outer peripheral view of the same.

FIG. 4 is a side view of the same.

5 is a sectional view taken along line YY of FIG.

FIG. 6 is a sectional view taken along line ZZ of FIG.

FIG. 7 is a sectional view showing a second embodiment of the present invention.

FIG. 8 is an inner peripheral view of the same.

FIG. 9 is an outer peripheral view of the same.

FIG. 10 is a cross-sectional view showing a first modification of the lug corresponding groove.

FIG. 11 is a sectional view showing a second modified example of the lug corresponding groove.

FIG. 12 is a sectional view showing a third modification of the lug corresponding groove.

FIG. 13 is a sectional view showing a fourth modified example of the lug corresponding groove.

FIG. 14 is a sectional view showing a fifth modified example of the lug corresponding groove.

FIG. 15 is a sectional view showing a sixth modification of the lug corresponding groove.

FIG. 16 is a sectional view showing a seventh modified example of the lug corresponding groove.

[Explanation of symbols]

 1 Elastic Crawler 2 Crawler Main Body 3 Engagement Hole 4 Core Bar 4A Wing Part 5 Tensile Body 6 Outer Surface 7 Lug 8 Inner Surface 9 Groove 9A Lug Compatible Groove 9B Non-Lug Compatible Groove 10 Bottom Raised Part L Length

Claims (3)

[Claims] 1. A crawler body (2) made of an elastic material is formed with engagement holes (3) for engaging drive wheels at equal intervals in the circumferential direction, and the crawler body (2) is provided with engagement holes (3) in the circumferential direction. ) And the left and right wing portions (4) of the core metal (4) are embedded.
A circumferential tensile body (5) is embedded on the outer peripheral side of (A), and a circumferential length (W) is provided on the outer peripheral surface (6) of the crawler body (2) across a plurality of cored bars (4). In an elastic crawler integrally molded with a lug (7) having a groove, the crawler body (2) is formed between the core metal (4) on the inner peripheral surface (8) from the engagement hole (3) side to the left and right outer sides. Groove (9)
The groove (9A) corresponding to the lug (7) has the lug (7)
An elastic crawler having a length (L) longer than the groove (9B) not corresponding to (3) and within the outer end of the blade (4A) of the cored bar (4). 2. The elastic crawler according to claim 1, wherein the left and right lug corresponding grooves (9A) are arranged in a staggered manner in the circumferential direction. 3. The elastic crawler according to claim 1, wherein the lug corresponding groove (9A) has a raised bottom portion (10) at a midway portion in the longitudinal direction.