JP4916359B2 - Elastic crawler - Google Patents

Description

  The present invention relates to an elastic crawler used in a crawler type traveling device employed as a traveling unit of a construction machine such as a backhoe or an agricultural machine such as a tractor or a combine.

  Conventionally, there is a crawler type traveling device in which an endless elastic crawler is wound around a sprocket, an idler, and a wheel, and the sprocket is rotationally driven so that the elastic crawler travels in a circulating manner in the circumferential direction. As an elastic crawler used in a crawler type traveling device, a crawler main body formed in an endless belt shape with rubber, and a core metal disposed in the crawler main body at intervals in the circumferential direction, the core metal, A core metal body embedded in the crawler body, and a pair of left and right anti-roll-off protrusions protruding from the core metal body to the inner peripheral side of the crawler body and positioned on the center side in the band width direction of the crawler body There is.

There are two types of wheels: the middle collar type, where the wheels run on the inner end of the crawler body, and the wheels run on the outer side of the crawler body band width of each of the left and right wheels. In the case of elastic crawlers used for backhoes, etc., lateral stability during machine work (stability when digging facing sideways) is required. Crawler-type travel devices that use wheels are becoming widespread. Elastic crawlers that are used in crawler-type travel devices equipped with outer flange type rollers (referred to as outer rail-type elastic crawlers) A rail portion is provided on the outer side of the crawler body band width direction of the ring prevention protrusion and extending from the core metal body so as to be exposed on the inner peripheral surface of the crawler body, and through which the wheel passes. (See Patent Document 1).
Japanese Utility Model Publication No. 03-35882

In the outer rail type elastic crawler, by providing a rail portion on the core metal, the area of the portion embedded in the rubber constituting the crawler body of the core metal body inevitably decreases. It is difficult to suppress the progress of the rust of the core metal after long-term use.
Also, during traveling such as turning, the wheel may be displaced in the crawler body band width direction, and the wheel may come off the rail part. In this case, the wheel is in the crawler body band width direction of the rail part. On the outer peripheral surface of the crawler body, the rubber constituting the crawler body is pinched between the rollers and the core metal body, and the rubber constituting the crawler body The cored bar body is exposed at the portion where the rubber has been removed.

Such a situation promotes the progress of the rust of the core metal.
In addition, since the undercarriage (traveling portion) of the backhoe is designed to be able to change between an elastic crawler and an iron shoe, specifically, as shown in part F of FIG. 4 is formed with an escape portion 23 for releasing the bush of the iron shoe, so that when the elastic crawler is mounted, the clearance between the derailment prevention protrusion 13 of the core metal 9 and the wheel is large, and the elastic crawler is slightly If twisted, the rolling portion 24 of the wheel 4 may easily travel on the outer side in the crawler body band width direction X of the rail portion 14 of the core metal 9 (see FIG. 6B).

For the reasons described above, the outer rail type elastic crawler has lower durability (core metal adhesive force) than the elastic crawler used in the crawler type traveling device equipped with the middle collar type wheel. As a result, there is a problem that the core falls into a situation.
Accordingly, an object of the present invention is to improve the durability of an elastic crawler by solving the above problems.

The technical means taken by the present invention in order to solve the technical problem includes a core metal provided at an interval in the circumferential direction on a crawler body formed in an endless belt shape by a rubber-like elastic material. The cored bar is a cored bar body embedded in the crawler body, a pair of left and right anti-roll-off projections protruding from the cored bar body to the inner peripheral side of the crawler body and positioned on the center side in the band width direction of the crawler body, The left and right derailment prevention protrusions are positioned on the outer side of the crawler body band width direction and extend from the core metal body so as to be exposed on the inner peripheral surface of the crawler body, and straddle both left and right derailment prevention protrusions. In an elastic crawler provided with a rail portion through which a wheel disposed at passes,
The rail portion extends outward from the crawler body band width direction from the core metal body toward the inner peripheral side of the crawler body, and the height from the elastic crawler grounding surface is the height of the rail portion from the elastic crawler grounding surface. It is formed lower than is, deviated outward side of the crawler body band width direction from the other of the left and right side portion rail portion of the engaging and and rolling wheel to derailing prevention protrusion of one of left and right side portions one of left and right sides of the track roller As described above, when the rollers are displaced in the crawler body band width direction, support protrusions are provided that can support the left and right other side portions of the rollers from below .

Further, the height of the support protrusion from the elastic crawler grounding surface is substantially the same as the height of the inner peripheral surface of the crawler body from the elastic crawler grounding surface or within 3 mm from the height of the inner peripheral surface of the crawler main body. It is better to set a low height.
In addition, another technical means includes a crawler main body formed in an endless belt shape by a rubber-like elastic material, and a cored bar provided at intervals in the circumferential direction, and the cored bar is embedded in the crawler main body. A metal core body, a derailment prevention protrusion that protrudes from the core metal body to the inner peripheral side of the crawler body and is located on the center side in the band width direction of the crawler body, and an outer surface of the derailment prevention protrusion in the width direction of the crawler body. In an elastic crawler provided with a rail portion that is located on the side and extends from the core metal body so as to be exposed on the inner peripheral surface of the crawler body, and through which the wheel passes.
The rail portion extends outward from the core metal body in the width direction of the crawler main body toward the inner peripheral side of the crawler main body, and the wheel is disengaged from the rail portion to the outer side in the width direction of the crawler main body. Provided with a support protrusion capable of supporting the wheel when
Characterized in that setting the height of the elastic crawler ground contact surface of the support protrusion at a height substantially the same height from the elastic crawler ground contact surface of the rail portion.

In addition, the distance in the crawler body band width direction between the rail portion and the support protrusion may be set to be equal to or less than the width of the rail portion in the crawler body band width direction.
Further, the area of the end surface on the extending side of the support protrusion should be less than or equal to ½ of the product of the width of the rail portion in the crawler body band width direction and the width of the core metal body in the crawler body circumferential direction. .

  According to the present invention, the support provided on the outer side of the rail portion in the crawler body band width direction even when the wheel may come off from the rail portion on the outer side in the crawler body band width direction during turning or the like. The protrusion supports the wheel, so that the elastic material constituting the crawler body can be prevented from being pinched and damaged by being pinched between the wheel and the core metal body. Can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 3, reference numeral 1 denotes a crawler type traveling device that is employed as a traveling unit of a construction machine or an agricultural machine.
This crawler type traveling device 1 includes a sprocket 2 disposed on one side of the front and rear, an idler 3 disposed on the other side of the front and rear, and a plurality of wheels 4 disposed between the sprocket 2 and the idler 3. The track frame 5 is supported by the track frame 5 so as to be rotatable about a horizontal axis, and the sprocket 2 is rotated by the endless elastic crawler 6 around the sprocket 2, the idler 3 and the plurality of wheels 4. The sprocket 2 is rotated. By driving, the driving force is transmitted from the sprocket 2 to the elastic crawler 6 so that the elastic crawler 6 circulates and runs in the circumferential direction Y, thereby being able to run in the front-rear direction.

The elastic crawler 6 has a crawler body 7 formed in an endless belt shape by a rubber-like elastic material (rubber in the present embodiment) such as rubber, resin, and the crawler body 7 has its width direction X left and right. It is wound around the sprocket 2, the idler 3, and the roller 4 in accordance with the direction.
As shown in FIGS. 1 and 2, lugs 8 that are in contact with the ground are provided on the outer circumference side of the crawler body 7 at intervals in the circumferential direction Y and over the entire circumference.

Further, the crawler body 7 is provided with a core metal 9 disposed so as to extend over the entire circumference in the circumferential direction Y with an interval in the circumferential direction Y.
In addition, on the outer peripheral side of the cored bar 9 in the crawler body 7, a tensile strength (not shown) is formed by arranging a number of tensile cords such as steel cords embedded in the circumferential direction Y in the left-right direction X. The body is provided.

Further, an engagement hole 10 into which teeth of the sprocket 2 are inserted to transmit power from the sprocket 2 to the elastic crawler 6 is adjacent in the circumferential direction Y of the crawler body 7 at the center in the left-right direction X of the crawler body 7. It is formed between each of the core bars 9 to be performed.
The metal core 9 is formed of a hard material such as metal, and a metal core body 12 embedded in the crawler main body 7 and a pair of left and right protruding from the metal core body 12 to the inner peripheral side of the crawler main body 7. Derailment prevention protrusion 13 and left and right rails located on the left and right direction X outward side of each left and right derailment prevention protrusion 13 (from the left and right direction X center of crawler body 7 toward the end in the left and right direction X) Part 14, a support protrusion 15 located on the outer side in the left-right direction X of each of the left and right rail parts 14, and a pair of left and right lateral restriction protrusions 16 provided around the crawler body circumferential direction Y of the core metal body 12. Prepare.

The core metal main body 12 includes a central portion 17 located on the center side in the left-right direction X of the crawler main body 7 and a wing portion 18 that integrally extends from the central portion 17 to the left and right sides.
The left and right derailment prevention protrusions 13 protrude from the central portion 17 of the core metal body 12 and are located on the center side in the left-right direction X of the crawler body 7. , The sprocket 2 is engaged to prevent the elastic crawler 6 from being derailed (the elastic crawler 6 is detached).

The left and right rail portions 14 extend from the core metal main body 12 (the wing portion 18) so as to be exposed from the inner peripheral surface of the crawler main body 7.
On the other hand, the wheel 4 is arranged straddling both left and right anti-derailing projections 13 and travels outward in the left-right direction X of the left and right anti-derailing projections 13 (see FIG. 6 ( a)) is adopted, and the end surface of the rail portion 14 on the inner peripheral side of the crawler body 7 is a rolling wheel rolling surface 19 on which the rolling wheel 4 travels (passes). It is formed in a flat shape.

In the present embodiment, one end side of the roller rolling surface 19 in the crawler body circumferential direction Y is at the same position as the end of the core body 12 in the crawler body circumferential direction Y, and the other end side is the core metal. The main body 12 protrudes from the end in the crawler main body circumferential direction Y in the crawler main body circumferential direction Y.
The left and right lateral restricting protrusions 16 are located on the center side in the left and right direction X of the core metal body 12, and the left and right distance between the left and right lateral restricting protrusions 16 before and after the crawler body circumferential direction Y is The lateral regulation protrusion 16 of one cored bar 9 adjacent to the crawler body circumferential direction Y is adjacent to the lateral regulation projection 16 of the other cored bar 9 in the lateral direction X. The horizontal restricting projections 16 restrict the movement of the adjacent core bars 9 in the left-right direction X in the circumferential direction Y of the crawler body.

  The support protrusion 15 is provided so as to extend from the core metal main body 12 (the wing portion 18) toward the inner peripheral side of the crawler main body 7, and the turning wheel 4 extends in the left-right direction X during turning. When the rolling portion of the rolling wheel 4 that causes the positional deviation and rolls on the rolling surface 19 of the rail portion 14 is disengaged from the rail portion 14 in the left-right direction X, the rolling wheel is rotated by the support protrusion 15. 4 is configured to support the rolling portion of the roller 4, thereby preventing the rubber constituting the crawler body 7 from being pinched between the rolling wheel 4 and the core metal body 12. Can do.

In the present embodiment, the support protrusion 15 is located at a substantially central portion in the crawler body circumferential direction Y of the cored bar wing portion 18, but is not limited to this.
In the following description, the height H1, H2, and H3 of the support protrusion 15, the inner peripheral surface of the crawler body 7 and the rail portion 14 are the heights from the elastic crawler grounding surface (that is, the grounding surface of the lug 8). This is simply called height.

In the example shown in FIG. 1, the height H1 of the support protrusion 15 is formed to be substantially the same as the height H2 of the inner peripheral surface of the crawler body 7 where the support protrusion 15 is provided. The end face 21 (this is referred to as the top) on the extending side of the support protrusion 15 (the inner peripheral side of the crawler main body 7) is located at substantially the same position as the inner peripheral surface of the crawler main body 7.
If the top 21 of the support protrusion 15 is exposed from the inner peripheral surface of the crawler body 7, the area of the core 9 embedded in the rubber constituting the crawler body 7 is reduced. 4A, it is advantageous to embed the top portion 21 of the support projection 15 several millimeters from the inner peripheral surface of the crawler body 7, but if it is buried too deeply, a countermeasure against the pinch state The effect will fade.

Therefore, when the support protrusion 15 is not exposed from the surface, the height H1 of the support protrusion 15 is preferably set to a height within 3 mm lower than the height H2 of the inner peripheral surface of the crawler body 7.
In other words, it is preferable that the top portion 21 of the support protrusion 15 is located within a distance of 3 mm from the inner peripheral surface of the crawler main body 7 to the inside of the rubber (on the outer peripheral side of the crawler main body 7). The rubber gauge between the top portion 21 and the inner peripheral surface of the crawler body 7 is 3 mm or less).

For the purpose of avoiding a pinch state, it is preferable to make the height of the support protrusion 15 as high as possible. However, if the height of the support protrusion 15 is higher than the height of the rail portion 14, the rolling wheels 4 are left and right. When it shifts in the direction X, problems such as abnormal wear of the wheel 4 and abnormal noise at the time of contact due to the wheel 4 coming into contact with the support protrusion 15 occur.
Therefore, when the support protrusion 15 protrudes from the inner peripheral surface of the crawler body 7, the height H1 of the support protrusion 15 is substantially the same as the height H3 of the rail portion 14, as shown in FIG. It is good to make it.

If the support protrusion 15 is too far away from the rail portion 14 in the left-right direction X, when the wheel 4 is displaced in the left-right direction X, the wheel 4 falls between the rail portion 14 and the support protrusion 15 and crawlers. Since the main body 7 is in a pinch state, the distance A in the left-right direction X between the rail portion 14 and the support protrusion 15 is preferably set to be equal to or less than the left-right width B of the rail portion 14.
Further, the size of the support protrusion 15 is larger, and the closer to the rail portion 14, the more effective the pinch state avoidance is, but the top portion 21 of the support protrusion 15 is exposed from the inner peripheral surface of the crawler body 7. If the support protrusion 15 is large, the area of the core 9 embedded in the rubber is reduced (even if it is not exposed, the support protrusion 15 increases, so that the holding force of the core 9 in the rubber is reduced. The rust of the cored bar 9 is likely to occur.

In view of this problem, the area of the top portion 21 of the support protrusion 15 is S, the width of the rail portion 14 in the crawler body band width direction X is B, and the width of the core metal body 12 in the crawler body circumferential direction Y is When C
S ≦ BC / 2 (1)
It is good to do.

In the example shown in FIGS. 1 and 2, the support protrusion 15 is formed in a truncated cone shape that gradually decreases in diameter toward the inner peripheral side of the crawler body 7, but is not limited thereto. A rectangular parallelepiped, a truncated quadrangular pyramid, or the like may be used.
1 and 2 exemplify the case where one support protrusion 15 is provided for one rail portion 14, the present invention is not limited to this, and the support protrusion 15 is provided for one rail portion 14. In the case where a plurality of support protrusions 15 are provided for the one rail portion 14, S (the area of the top portion 21 of the protrusion) in the equation (1) is the same as that of the plurality of support protrusions 15. The sum of the areas of the top 21 is used.

  FIG. 5 is a view showing a modified example of the support protrusion 15, and FIG. 5A shows a shape in which the shape of the top portion 21 is a rectangle that is long in the left-right direction X (thus, a rectangular parallelepiped or truncated quadrangular pyramid support). 5 (b) shows a shape in which the shape of the top portion 21 is a rectangular shape that is long in the circumferential direction Y of the crawler body 7, and FIG. 5 (c) shows the support protrusion 15 of the crawler body 7. Two are provided in the circumferential direction Y, and FIG. 5D shows that the shape of the top portion 21 has a cross shape.

It is sectional drawing which cut | disconnected the elastic crawler by the surface orthogonal to the circumferential direction, and has displayed the half of the band width direction. It is the figure which looked at the inside of an elastic crawler from the inner peripheral side. It is a side view of a crawler type traveling device. It is sectional drawing of the elastic crawler which shows the other example of a support protrusion. It is a top view of the metal core which shows the other example of a support protrusion. It is a figure which shows the relationship between the conventional wheel and a metal core.

4 Roller 7 Crawler Main Body 9 Core 12 Core Metal Main Body 13 Derailment Prevention Protrusion 14 Rail 15 Support Protrusion 20 Elastic Crawler Grounding Surface (Lug Grounding Surface)
A Distance in the crawler body band width direction between the rail part and the support protrusion B B Width in the crawler body band width direction of the rail part C Width of the core metal body in the crawler body circumferential direction H1 Height of the support protrusion H2 Inside of the crawler body Height of peripheral surface H3 Height of rail S Area of end surface on the extension side of support protrusion X Crawler body band width direction (left-right direction)
Y crawler body circumferential direction

Claims (5)

A crawler body (7) formed in an endless belt shape by a rubber-like elastic material is provided with a core metal (9) provided at intervals in the circumferential direction (Y). 7) A core metal body (12) embedded in the core metal body, and protrudes from the core metal body (12) to the inner peripheral side of the crawler body (7) and to the belt width direction (X) center side of the crawler body (7). a pair of left and right derailing prevention protrusions located (13), the inner peripheral side of the left and right positions to and crawler body outward side of the crawler body band width direction (X) of the derailing prevention protrusions (13) (7) A rail portion (14) that extends from the metal core body (12) so as to be exposed on the surface and through which a wheel (4) that is disposed across the left and right anti-derailing projections (13) passes. In the elastic crawler
An elastic crawler grounding surface (20) extending from the core metal body (12) toward the inner peripheral side of the crawler body (7) on the outer side in the crawler body band width direction (X) of the rail portion (14 ). The height (H1) from the rail (14) is lower than the height (H3) from the elastic crawler contact surface (20) of the rail portion (14), and the left and right side portions of the rolling wheels (4) are on the left and right sides. said transfer wheel so that deviates outward side of the engage the derailing prevention protrusion (13) and track roller (4) of the other of the left and right sides portions crawler body band width direction from the rail section (14) (X) ( 4) is provided with support protrusions (15) capable of supporting the other left and right side portions of the rollers (4) from the lower side when they are displaced in the crawler body band width direction (X). Crawler.   The height (H1) of the support protrusion (15) from the elastic crawler grounding surface (20) is substantially the same as the height (H2) of the inner peripheral surface of the crawler body (7) from the elastic crawler grounding surface (20). 2. The elastic crawler according to claim 1, wherein the elastic crawler is set to have the same height or a height within 3 mm below the height (H2) of the inner peripheral surface of the crawler main body (7). A crawler body (7) formed in an endless belt shape by a rubber-like elastic material is provided with a core metal (9) provided at intervals in the circumferential direction (Y). 7) A core metal body (12) embedded in the core metal body, and protrudes from the core metal body (12) to the inner peripheral side of the crawler body (7) and to the belt width direction (X) center side of the crawler body (7). The derailment prevention protrusion (13) that is positioned, and the disengagement prevention protrusion (13) that is located on the outer side in the crawler body band width direction (X) and exposed on the inner peripheral surface of the crawler body (7). In an elastic crawler provided with a rail portion (14) extending from the core metal body (12) and through which the wheel (4) passes,
The rail portion (14) extends outward in the crawler body band width direction (X) from the core metal body (12) toward the inner peripheral side of the crawler body (7). Is provided with a support projection (15) capable of supporting the wheel (4) when it is disengaged from the rail portion (14) in the crawler body band width direction (X).
The height (H1) of the support protrusion (15) from the elastic crawler grounding surface (20) is set to be substantially the same as the height (H3) of the rail portion (14) from the elastic crawler grounding surface (20). The elastic crawler according to claim 1.   The distance (A) in the crawler body band width direction (X) between the rail part (14) and the support protrusion (15) is the width (B) of the rail part (14) in the crawler body band width direction (X). The elastic crawler according to claim 1, 2 or 3, wherein:   The area (S) of the end surface (21) on the extension side of the support protrusion (15) is set to the width (B) of the rail portion (14) in the crawler body band width direction (X) and the core metal body (12). 5. The elastic crawler according to claim 1, wherein the crawler body is less than or equal to ½ of a product of a width (C) in a circumferential direction (Y).

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