JP2001341676A - Elastic crawler and core body therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a crack from being generated between a groove part 22 between guide protrusions 15A, 15B projected in an inner circumferential side of a crawler main body 2 and a side slip preventing protrusion 20B. SOLUTION: This crawler is provided with the crawler main body 2 formed endless-beltlikely by an elastic material, and the core body 5 embedded in the crawler main body 2 with a space along its inner circumferential direction, the guide protrusions 15A, 15B projected to an inner circumference side corresponding to an embedded position of the core body 5 and arranged circumference-directionally are provided in an inner circumferential face of the crawler main body 2, the core body 5 has the side slip preventing protrusion 20B lapped laterally to another core body 5 projected circumference-directionally to be adjacent, and a recessed part 21 for increasing a wall thickness of the crawler main body 2 with respect to the groove part 22 is formed in an inner circumferential side face of the protrusion 20B corresponding to the groove part 22 between the guide protrusions 15A, 15B.

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 a core for an elastic crawler used for tracked vehicles such as construction, civil engineering, and agricultural machines.

[0002]

2. Description of the Related Art An elastic crawler of this type is used by being wound around a driving wheel, a driven wheel and a rolling wheel provided on a track frame of a tracked vehicle, and is formed in an endless belt shape using an elastic material such as rubber. Crawler body and a core bar (core body) embedded in the crawler body at a predetermined circumferential interval
And the main configuration. A pair of left and right guide projections projecting from the inner peripheral surface of the crawler body to the inner peripheral side are formed on the cored bar, and the guide projections guide the drive wheel, the driven wheel, and the rolling wheel.

In this elastic crawler, when a left-right force is applied to the crawler body during running, such as when climbing on a step or a stone, the core metals adjacent in the circumferential direction are displaced from each other in the left-right direction. This misalignment was one of the factors that caused the rolling wheels and the like to come off. Therefore, in addition to forming lateral displacement prevention protrusions that protrude in the circumferential direction on both front and rear side surfaces of the core bar, the lateral displacement prevention protrusions of adjacent core bars in the crawler body are overlapped with each other in the left-right direction, so that the left and right movement of each core bar is performed. An elastic crawler has been proposed in the past to prevent derailing by mutually restricting each other (for example, see Japanese Patent Application Laid-Open No.
226372).

[0004]

FIG. 10 shows a conventional elastic crawler in which cores 104, 105 having lateral displacement prevention projections 101, 102 are embedded. In this elastic crawler, a crawler body 103 is shown. Is the adjacent metal core 10
A groove 108 between the guide projections 106 and 107
The protrusion 101 of one core 104 passes through the outer peripheral side of the groove 108, and its tip is overlapped with the protrusion 102 of the other core 105.

Since the crawler body 103 is bent at the position X of the groove 108 along the driving wheel and the driven wheel, the deeper the groove 108 is, the more the flexibility is improved. Is too deep to prevent lateral displacement
1 becomes thinner, so that crack A
The problem of prompting the occurrence of a problem has arisen. In particular, as shown in the drawing, when the lateral deviation preventing projections 101 and 102 are overlapped at a position Y that is displaced in the circumferential direction from the bent portion X of the crawler main body 103, each lateral deviation preventing projection 10 is placed at a position where it is difficult to bend.
Cracks A were more likely to occur due to relative movement of 1,102.

In view of such circumstances, the present invention provides an elastic crawler and an elastic crawler capable of preventing the occurrence of cracks by increasing the thickness of a crawler body between a groove between guide protrusions and a lateral displacement prevention protrusion. It is intended to provide a core.

[0007]

The present invention employs the following technical means to achieve the above object. That is, the elastic crawler according to the present invention includes a crawler body formed in an endless band shape from an elastic material, and a core embedded in the crawler body at intervals in a circumferential direction, and an inner peripheral surface of the crawler body. Is provided with guide projections projecting inward and corresponding to the embedded position of the core body and arranged in the circumferential direction. The core body projects from the main body in the circumferential direction and is adjacent to the core body. A lateral displacement prevention projection that overlaps in the left-right direction with respect to the core body of the crawler body between the groove and the inner peripheral surface of the lateral displacement prevention projection corresponding to the groove between the guide projections. It is characterized in that a concave portion for increasing the wall thickness is formed.

According to this, even if the groove between the guide projections is formed deep in order to improve the flexibility of the crawler main body, the recess formed in the horizontal deviation prevention projection forms a gap between the horizontal deviation prevention projection and the groove. The thickness of the crawler body can be ensured, and it is possible to prevent the occurrence of cracks and the like in the portion. The guide projection may be formed integrally with the core body, or may be formed integrally with the crawler body. The elastic crawler core according to the present invention includes a body portion embedded in the endless belt-shaped crawler body made of an elastic material at intervals in a circumferential direction,
A guide portion having a guide projection protruding inward from the inner peripheral surface of the crawler body; and a left and right relative to other cores projecting circumferentially from the guide portion and adjacent in the crawler body. An elastic crawler core having a lateral displacement prevention projection that overlaps in a direction, wherein the lateral displacement corresponding to a groove between the guide projection and a guide projection of another adjacent core in the crawler body. On the inner peripheral surface of the prevention protrusion,
A recess is formed between the groove and the groove to increase the thickness of the crawler body.

By embedding the elastic crawler core in the crawler body, the same operation and effect as described above can be obtained. The above-described lateral displacement prevention projection is characterized in that the tip side from the concave portion forming portion is a superposed portion with respect to another adjacent core body, and the superposed portion is formed vertically longer than the concave portion forming portion. As a result, even if a concave portion is formed in the lateral deviation prevention projection, a polymerization area for another adjacent core body can be secured, and the lateral deviation prevention function is not impaired.

The other core body adjacent in the crawler main body is provided integrally with a guide projection protruding from the main body in the circumferential direction, and is provided on the lower surface of the circumferential projection of the guide projection. It is preferable that the second lateral displacement prevention projection to be superposed is provided so as to project downward, and a recess is formed between the second lateral displacement prevention projection and the main body of the other core so as to separate them. With such a configuration, by embedding the elastic material of the crawler main body in the concave portion, the amount of the elastic material around both lateral displacement prevention protrusions can be increased, and peeling of the crawler main body and occurrence of cracks can be prevented. Become like

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an elastic crawler 1 according to a first embodiment of the present invention. The elastic crawler 1 is wound around a driving wheel, a driven wheel, and a rolling wheel 9 provided on a track frame of a tracked vehicle. A crawler body 2 formed in an endless band with an elastic material such as rubber or synthetic resin;
The lugs 3 are projected from the outer peripheral surface of the main body at intervals in the circumferential direction (longitudinal direction; front and rear direction).

A large number of cores 5 are buried in the crawler body 2 at intervals in the circumferential direction, and a pair of left and right circumferential members made of a steel cord or the like are provided on the grounding surface side (outer peripheral side) of the cores 5. Tensile body 6 is embedded. The core body 5 is formed of metal or a hard synthetic resin or the like, and as shown in FIGS. 1, 4 and 5, a drive wheel ( An engagement portion 8 with which the driving sprocket engages is formed, and a pair of left and right guide portions 10 that form a left-right guide such as a rolling wheel 9 is formed on both left and right sides of the engagement portion 8. On both sides of the
A pair of left and right wheel rolling portions 11 having tread portions 11A and 11B of the rolling wheels 9 are formed, and a pair of left and right wing portions 12 extending to the left and right ends of the crawler body 2 are provided on both left and right sides of the wheel rolling portions 11. Are formed.

The rolling wheel 9 is provided with a pair of guide portions 1.
It is a mating wheel that straddles 0 (see FIG. 3), and an insertion hole 13 into which the teeth of the driving sprocket are inserted is formed between the engaging portions 8 of the crawler body 2 (FIGS. 2 and 5). 3
reference). As shown in FIGS. 4 and 5, the guide portion 10
A first guide portion 10A disposed on one side of the left and right of the engagement portion 8
And a second guide portion 10B disposed on the other side, and the first guide portion 10A has one guide protrusion 15A protruding toward the inner peripheral side of the crawler main body 2, and the second guide portion The portion 10B has two guide projections 15B protruding toward the inner peripheral side of the crawler main body 2 at intervals in the circumferential direction.

The two guide projections 15B, 15B of the second guide portion 10B are arranged so as to be separated back and forth across the center of the core body 5 in the front-rear direction.
A front portion or a rear portion of 5B is provided so as to protrude forward and backward from main body portion 5A (engaging portion 8 and wing portion 12). One guide projection 15A of the first guide portion 10A is disposed at the front-rear center position of the core body 5 so as to correspond between the respective guide projections 15B, 15B of the second guide portion 10B, and has front and rear portions thereof. Are the respective guide projections 15 of the second guide portion 10B.
B and 15B are arranged to overlap in the left-right direction.

As shown in FIG. 2, the cores 5 adjacent to each other in the circumferential direction of the crawler main body 2 are connected to a first and second guide portions 10.
The left and right positions of A and 10B are arranged in reverse, so that the first and second guide portions 10A and 10B are alternately arranged in the circumferential direction of the crawler body 2. The second guide portion 10B includes two guide protrusions 15B, 15B.
, The distance between the first guide portion 10A adjacent in the circumferential direction can be reduced, and the guide protrusions 15A and 15B are arranged in a staggered left and right direction in the circumferential direction. In addition, the left and right guide projections 15A, 15
B is continuous in the circumferential direction, and the guide function is enhanced.

Further, the guide portions 10 on the left and right sides of the core 5 are provided.
Compared to the case where 10 is formed widely in the front-rear direction, the weight of the core body 5 can be reduced by forming one of the guide protrusions 15A to be short in the front-rear direction. As shown in FIGS. 4 and 5, the tread portions 11A, 11A of the wheel running portion 11 are provided.
B is formed so as to protrude slightly from the boundary between the first and second guide portions 10A and 10B to the inner peripheral side of the crawler main body 2, and is on the same side as the first guide portion 10A with respect to the engaging portion 8. And a second tread portion 11B disposed on the same side as the left and right sides of the second guide portion 10B.

The first tread portion 11A includes an engaging portion 8 and a wing portion 1.
2 is formed in the same front and rear width as that of the second.
The tread portion 11B protrudes forward and backward from the engaging portion 8 and the wing portion 12 to increase the tread surface area. As shown in FIG. 2, since the first and second guide portions 10A and 10B are alternately arranged in the circumferential direction of the crawler body 2, the first and second tread portions 11A and 11B are also alternately arranged in the circumferential direction. The distance between the first tread portion 11A and the first tread portion 11A is made as small as possible by the second tread portion 11B which is long in the front-rear direction.
The occurrence of vibrations due to the drop of the water is prevented.

The arrangement of the first and second tread portions 11A is as follows.
Left and right reversed (the second tread 1 is on the same side as the first guide 10A)
1B, and the first tread 11A on the same side as the left and right of the second guide 10B). Further, the upper surfaces of the guide protrusions 15A and 15B may be configured as tread portions of the rolling wheel 9. As shown in FIGS. 4 and 5, the first guide portion 10 </ b> A has a first protrusion projecting from the front and rear side surfaces of the main body portion 5 </ b> A below the guide protrusion 15 </ b> A.
Lateral deviation prevention projection (lateral deviation prevention projection according to the present invention) 20
A is formed.

On the other hand, on the second guide portion 10B, the second lateral displacement prevention protrusion 20 is formed so as to protrude downward from the lower surface of a portion where two guide protrusions 15B, 15B protrude forward and backward from the main body portion 5A.
B is formed. The left-right distance between the first and second lateral deviation preventing projections 20A and 20B disposed on one front and rear side surface of each core body 5, and the first and second lateral deviation preventing projections 20A and 20B disposed on the other front and rear side surfaces. As shown in FIG. 2, in the core body 5 adjacent in the circumferential direction in the crawler body 2, the first and second spaces having the wide left and right spaces are different from each other.
The lateral displacement prevention protrusions 20A and 20B and the first and second lateral displacement prevention protrusions 20A and 20B having a narrow left-right distance are opposed to each other, and each of the first lateral displacement prevention protrusions 20A and each of the second lateral displacement prevention protrusions 20B and Are arranged so as to overlap each other in the left-right direction.

More specifically, as shown in FIG.
The tip of the lateral displacement prevention projection 20A enters the lower side of the guide projection 15B of the adjacent core body 5 and overlaps the lower end of the second lateral displacement prevention projection 20B to regulate mutual lateral movement. It has become. The first and second lateral displacement prevention protrusions 20A and 20B may be polymerized in a state of direct contact, or may be polymerized in a state where the elastic material of the crawler body 2 is interposed between the two. It may be something. As shown in FIG. 1, the crawler main body 2 has a groove portion 22 dug deeply to the outer peripheral side between the guide protrusions 15 </ b> A and the guide protrusions 15 </ b> B which are adjacent in the circumferential direction.
Is formed so that the crawler body 2 is bent along the driving wheel or the driven wheel at the formation site X of the. 2nd guide part 1
A groove may be left between the guide protrusions 15B, 15B of OB, or an elastic material integral with the crawler body 2 may be embedded.

First and second lateral displacement preventing projections 20A and 20B
Are overlapped at a position Y that is circumferentially displaced from the formation position X of the groove 22, and the first lateral deviation prevention protrusion 20 </ b> A passes through the outer peripheral side of the groove 22 and is formed in the front and rear halfway portions corresponding to the groove 22. A concave portion 21 that is concave toward the outer peripheral side is formed on the peripheral surface. Therefore, even if the groove 22 is formed deeply to improve the flexibility of the crawler body 2, the thickness T of the crawler body 2 from the first lateral displacement prevention projection 20 </ b> A to the bottom of the groove 22 can be sufficiently increased due to the presence of the recess 21. , Thereby preventing the occurrence of cracks and the like in the portion.

The tip of the first lateral displacement prevention projection 20A that overlaps with the second lateral displacement prevention projection 20B (overlapping portion 23).
Are formed to be vertically longer than the recessed portion 21 formed halfway in the front-rear direction, and the overlapping area with the second lateral displacement prevention protrusion 20B is enlarged. Thus, even if the concave portion 21 is formed in the first lateral deviation prevention projection 20A, the lateral deviation prevention function is not impaired. The second lateral displacement prevention protrusion 20B is
The overlapping portion 24 at the lower end is slightly protruded in the front-rear direction than the guide projection 15B, and the overlapping area with the first lateral displacement preventing projection 20A is enlarged, thereby also improving the lateral displacement preventing function.

The second lateral displacement prevention projection 20B and the main body 5A are separated from each other back and forth via a recess 25.
5, the weight of the core body 5 can be reduced, and by embedding the elastic material of the crawler body 2 in the recess 25,
The amount of the elastic material around the first and second lateral displacement prevention protrusions 20A and 20B is increased to prevent peeling and cracking. The lower surfaces (outer peripheral surfaces) of the first and second lateral deviation preventing protrusions 20A and 20B are formed as inclined surfaces such that the leading ends move upward (inner peripheral sides), whereby the crawler body 2 is bent. The compression of the tension body 6 at the time of the above is prevented, and the damage of the tension body 6 can be prevented.

Further, by projecting the second lateral deviation preventing projection 20B downward from the lower surface of the guide projection 15B and forming a concave portion 25 between the second lateral deviation preventing projection 20B and the core metal body 5A, the area of the lower surface of the second lateral deviation preventing projection 20B is reduced. Thus, the compression of the tensile member 6 can be prevented. As shown in FIGS. 1 and 3, on the left and right sides of the second lateral displacement prevention projection 20B and below the guide projection 15B,
The thinned portion 26 is formed, the weight of the core body 5 can be reduced by the thinned portion 26, and the elastic material of the crawler body 2 is buried in the thinned portion 26, so that the lateral displacement preventing projections 20A, By increasing the amount of elastic material around 20B, effects such as prevention of peeling can be obtained.

Although the first lateral displacement prevention projection 20A has the bottom surface of the concave portion 21 formed in a straight line, it may be formed in an arc shape along the bottom of the groove 22 or the like. The overlapping area may be enlarged by projecting the overlapping portion 23 downward (outer peripheral side). FIG. 6 shows a second embodiment of the present invention.
This shows an embodiment, in which guide projections 15, 15 adjacent in the circumferential direction are projected in the same direction in the front-rear direction with respect to the main body 5A, and the first and second lateral displacement prevention projections 20A, 20B are
Both are formed to protrude in the front-rear direction from both front and rear side surfaces of the guide portion 10, and are provided on the inner peripheral surface of the front and rear halfway portion of the first lateral displacement prevention protrusion 20 </ b> A corresponding to the groove portion 22 between the guide protrusions 15 and 15. A recess 21 is formed.

In this embodiment, the guide projections 15,
The upper surface of 15 is formed on the tread portion of the rolling wheel 9. However, similarly to the first embodiment, the guide portion 10
A tread portion (wheel rolling portion) may be formed between the left and right of the wing portion 12. The concave portion 21 of the present embodiment also has substantially the same operation and effect as the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals.
Detailed description is omitted. FIG. 7 shows a third embodiment of the present invention, in which a guide protrusion 15 has substantially the same front-rear width as the engaging portion 8 and the wing portion 12, and protrudes from one front and rear side surface of the guide portion 10. The lateral displacement prevention projection 20A is long and the lateral deviation prevention projection 20B protruding from the other side surface is formed short.

Then, the first lateral deviation preventing projections 20A and the second lateral deviation preventing projections 20B of the core body 5 circumferentially adjacent to each other overlap in the left-right direction, and the lateral deviation preventing projections 2 corresponding to the grooves 22 are formed.
A concave portion 21 is formed on the inner circumferential surface of the halfway portion of 0A. The concave portion 21 of the present embodiment also has substantially the same operation and effect as the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. FIGS. 8 and 9 show a fourth embodiment of the present invention, in which a guide projection 15A of a first guide portion 10A is formed of an elastic material integral with the crawler body 2. FIG.

In this embodiment, the weight of the core body 5 can be reduced by forming the guide projection 15A integrally with the crawler body 2 instead of the core body 5. The other configurations, functions and effects are the same as those of the first embodiment. The present invention is not limited to the above-described embodiment, and can be appropriately changed in design. For example, the first lateral deviation prevention protrusion may be configured to overlap in the left-right direction with respect to the guide protrusions, wings, and the like of another adjacent core body (a configuration in which the second lateral deviation prevention protrusion is omitted). First
The tip of the second lateral displacement prevention projection may be bent in a hook shape so as to overlap in the front-back direction or the up-down direction.

The second guide portion in the first and fourth embodiments may have a configuration in which two guide projections are integrated to have one guide projection that is long in the front and rear direction.

[0030]

As described above in detail, according to the present invention, even if the groove between the guide projections is formed deeply to improve the flexibility of the crawler body, the lateral deviation preventing projections allow the lateral movement of the crawler body. The thickness of the crawler body between the deviation preventing protrusion and the groove can be ensured, and the occurrence of cracks in the portion can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view (an arrow BB in FIG. 2) of a core (elastic crawler) according to a first embodiment of the present invention.

FIG. 2 is an inner peripheral plan view of the elastic crawler.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a plan view of a core.

5 (a) is a diagram indicated by an arrow C in FIG. 4, and FIG. 5 (b) is a diagram indicated by an arrow D in FIG.

FIG. 6 is a side view of an elastic crawler according to a second embodiment of the present invention.

FIG. 7 is a side view of an elastic crawler according to a third embodiment of the present invention.

FIG. 8 is a side view of an elastic crawler according to a fourth embodiment of the present invention.

9 is a front sectional view (corresponding to a sectional view taken along the line AA in FIG. 2) of the same.

FIG. 10 is a side view of an elastic crawler showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler main body 5 Core body 10 Guide part 15A Guide protrusion 15B Guide protrusion 20A 1st horizontal deviation prevention protrusion 21 Depression 22 Groove

Claims (6)

[Claims] 1. A crawler body formed in an endless band shape from an elastic material, and a core body embedded in the crawler body at intervals in a circumferential direction, wherein the core is provided on an inner peripheral surface of the crawler body. Guide protrusions are provided which protrude inward and are arranged in the circumferential direction in correspondence with the buried position of the body, and wherein the core body protrudes from the main body in the circumferential direction and is adjacent to another core body. A lateral displacement preventing projection that overlaps in the left-right direction, and on the inner peripheral surface of the lateral displacement preventing projection corresponding to the groove between the guide projections, increases the thickness of the crawler body between the groove and the groove. An elastic crawler having a recess. 2. The method according to claim 1, wherein the tip of the lateral displacement prevention projection with respect to the concave portion forming portion is formed as an overlapping portion with respect to another adjacent core body, and the overlapping portion is formed vertically longer than the concave portion forming portion. The elastic crawler according to claim 1, 3. The guide projection is formed integrally with the other adjacent core body, and the guide projection protrudes in the circumferential direction from the main body. A second lateral deviation prevention projection that overlaps with the lateral deviation prevention projection is projected downward, and a recess is formed between the second lateral deviation prevention projection and the main body of the other core so as to separate them from each other. The elastic crawler according to claim 1 or 2, wherein: 4. A crawler body in the form of an endless belt made of an elastic material and having a main body portion buried at an interval in a circumferential direction, wherein the main body portion has a guide projection protruding inward from an inner peripheral surface of the crawler main body. And an elastic crawler core body having a guide portion having a protrusion and a lateral displacement prevention protrusion projecting in the circumferential direction from the guide portion and overlapping in the left-right direction with another core body adjacent in the crawler body. The inner surface of the lateral displacement prevention projection corresponding to the groove between the guide protrusion and the guide protrusion of another core body adjacent in the crawler body, and the thickness of the crawler body between the groove and the groove. A core body for an elastic crawler, wherein a concave portion having an increased thickness is formed. 5. The method according to claim 5, wherein a tip end side of the lateral deviation preventing projection from the concave portion forming portion is an overlapping portion with respect to another adjacent core body, and the overlapping portion is formed vertically longer than the concave portion forming portion. The elastic crawler core according to claim 4. 6. A guide projection of said adjacent other core body is formed so as to protrude also in a circumferential direction from a main body thereof, and is overlapped with said lateral displacement prevention projection on a lower surface of a circumferential projection of said guide projection. The second lateral deviation preventing projection is provided to project downward, and a recess is formed between the second lateral deviation preventing projection and the main body of the other core so as to separate them from each other.
Or the elastic crawler core according to 5.