JP2013100104A - Rubber crawler, and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber crawler including a drive engagement part having excellent durability.SOLUTION: This rubber crawler 1 includes: lugs 2 formed on an outer peripheral surface; and the drive engagement part formed on an inner peripheral surface in order to transmit driving force. The rubber crawler is transmitted with the driving force by engaging a sprocket 100 with the drive engagement part. The drive engagement part includes: hard engagement members 5 buried at a constant pitch in the peripheral direction of the rubber crawler 1; and recessed parts 3 arranged in each portion between the engagement members 5 and receiving the tooth parts of the sprocket. With the rubber crawler, since the tooth parts of the sprocket are engaged with the recessed parts arranged in each portion between the hard engagement members, damage or the like to the drive engagement part is suppressed in comparison with the existing case that the tooth parts are made to abut on drive projection parts projecting on the inner peripheral surface. It is also possible to reduce contact pressure in such a manner that the shape of each of the recessed parts is appropriately changed and an engagement area with respect to the tooth part is enlarged.

Description

  The present invention relates to a rubber crawler and a sprocket employed in a traveling part of a vehicle, and more particularly to a rubber crawler with improved durability of a drive engagement part and a sprocket applied thereto.

In recent years, rubber crawlers have been widely used in traveling parts of vehicles such as construction machines and agricultural machines from the viewpoints of road surface protection, noise suppression, and environmental protection. As such a rubber crawler, for example, one disclosed in Patent Document 1 is well known.
This is a rubber crawler formed on the inner peripheral surface of a rubber bumper at a constant pitch with a drive protrusion made of a rubber lump. The drive protrusion is a protrusion-like object raised up in a mountain shape on the inner peripheral surface. The driving force is transmitted to the rubber crawler by engaging the teeth of the sprocket attached to the driving shaft with the driving protrusion.

JP 2003-226271 A

  However, the rubber crawler disclosed in Patent Document 1 is rotated by transmitting a driving force by engaging a toothed portion (engaging tooth) of a sprocket with a driving protrusion provided so as to protrude toward the inner peripheral surface thereof. In this rubber crawler, the sprocket teeth are brought into contact with the middle of the drive protrusion, so that the drive protrusion repeatedly acts on the drive protrusion, so the base of the drive protrusion As a result, the stress is concentrated on a specific location such as the rubber crawler, and there is a problem that the rubber crawler is easily broken or damaged around the driving protrusion.

  Therefore, a main object of the present invention is to provide a rubber crawler excellent in durability of the drive engagement portion, and another object is to provide a sprocket suitable for this rubber crawler. .

  The above object has a lug portion on the outer peripheral surface and a drive engagement portion for transmitting a driving force on the inner peripheral surface, and transmits the driving force by engaging a sprocket with the drive engagement portion. The crawler is a rubber crawler, wherein the drive engagement portion is disposed between the engagement member and a hard engagement member embedded at a constant pitch in the circumferential direction of the rubber crawler, And can be achieved by a rubber crawler comprising a recess for receiving the.

And it is preferable to employ | adopt the structure which forms a pair of corner | angular part which protrudes in the inner peripheral surface side of a crawler as said engaging member through the rolling space of the said sprocket.
The engaging member is preferably a metal core embedded at a predetermined pitch in the rubber crawler.

Moreover, it is preferable that the crawler inner peripheral surface between the engaging member and the concave portion is a raised surface provided by raising from a standard inner peripheral surface.
Here, the “standard inner peripheral surface” refers to a plane that passes through the inner peripheral surface side of the rubber crawler at the blade root portion of the cored bar.

Moreover, it is desirable to form a groove portion extending in the width direction of the rubber crawler between the engaging member and each raised surface.
By the way, in this case, the groove extending in the width direction of the rubber crawler is formed over the entire width of the raised surface, and is formed corresponding to both side portions of the raised surface in the width direction, and the width direction of the raised surface. It is preferable to form it corresponding to the central part of the.

Further, the object is a sprocket applied to any of the rubber crawlers described above, and a plurality of circular base portions and a plurality of peripheral portions arranged at predetermined intervals in the circumferential direction of the circular base portions. These sprockets can also be achieved by a sprocket that protrudes radially outward from the peripheral edge of the circular base portion.
Further, the above object is a sprocket applied to any of the rubber crawlers described above, and includes a circular base portion and a plurality of tooth portions disposed on a peripheral portion of the circular base portion, and these tooth portions. Can also be achieved by a sprocket that protrudes to both sides in the crawler width direction with respect to the circular base portion.

  According to the rubber crawler of the present invention, the sprocket teeth are engaged with the recesses arranged between the hard engagement members, so the teeth are engaged with the middle of the drive protrusion protruding on the inner peripheral surface. Compared with the conventional case, the position of the power point becomes lower, and this can suppress the occurrence of damage to the drive engagement portion.

Further, since this rubber crawler has a structure in which concave portions are provided at a constant pitch, even if the crawler is bent when passing through a sprocket or idler, the occurrence of distortion can be suppressed. And here, it is also possible to reduce the surface pressure by appropriately changing the shape of the recess to enlarge the area of engagement with the tooth.
Thus, the rubber crawler according to the present invention can improve the durability by suppressing the occurrence of damage and the like.

  Moreover, here, when the rubber crawler is driven by the sprocket, the sprocket driving force is indirectly engaged with the engaging member through the concave wall surface having a sufficient rubber thickness. Can be sufficiently supported by the hard engagement member under the buffering of the concave portion, and therefore, when the rubber crawler is repeatedly driven, the local engagement with the engagement member that becomes the engagement portion with the sprocket is still possible. The durability of the engaging member can be exhibited without stress concentration.

  In addition, here, the rubber thickness in the recesses is made sufficiently thick to prevent the hard engagement member from being exposed when the rubber crawler is driven by the sprocket, and thus preventing the sprocket teeth and the engagement member from colliding with each other. Thus, it is possible to prevent the occurrence of collision noise due to the direct contact between them.

  When the engaging member of the rubber crawler has a corner portion and the corner portions are a pair arranged so as to receive the sprocket therebetween, the tooth portion is guided to the inner circumference while guiding the sprocket between the corner portions. It can be smoothly engaged with the recess provided on the surface.

  Further, when the inner peripheral surface between the engaging member and the concave portion is raised, the contact area between the concave wall surface and the sprocket can be increased, so that the surface pressure can be reduced and the durability can be further improved.

Furthermore, if a groove extending in the width direction of the crawler is formed between the engaging member and the raised surface, distortion generated when the rubber crawler is bent can be reduced, and positioning accuracy of the engaging member can be improved during manufacturing. It can also be useful.
This is particularly effective when the groove is formed continuously over the entire width of the raised surface.

  By the way, in this case, when the groove portion is formed corresponding to both side portions in the width direction of each raised surface, it is engaged with a vulcanization mold, for example, a lower mold thereof, at the time of manufacturing the rubber crawler. The positioning of the member can be performed more stably and more reliably with respect to the displacement of the engaging member in any direction, and the groove is formed corresponding to the central portion of the raised surface in the width direction. In this case, the rubber crawler can secure a sufficient rubber thickness in the protruding base portion of the corner, which is particularly easy to peel off the rubber, and can effectively prevent the unexpected peeling.

  Sprockets with teeth protruding radially outward from the periphery of the circular base portion, and sprockets with teeth disposed at the periphery of the circular base portion protruding to both sides in the crawler width direction with respect to the circular base portion When this is applied to the above-described rubber crawler, since the tooth portion reliably engages with the above-described recess, smooth driving can be realized.

It is the perspective view which showed a part of rubber crawler which concerns on one Embodiment of this invention. It is the figure which expanded and showed the engaging part of a rubber crawler and a sprocket. It is an expansion | deployment top view of the internal peripheral surface side of a rubber crawler. It is a principal part expansion | deployment top view which shows the other formation side of a groove part. It is the figure which showed collectively the example of the sprocket which has a tooth | gear part which can be engaged with a rubber crawler. It is the figure shown in order to demonstrate the relationship between the recessed part of a rubber crawler, and the tooth | gear part of a sprocket.

  Hereinafter, an embodiment according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a part of a rubber crawler according to an embodiment. FIG. 1 also shows a sprocket that transmits a driving force to the rubber crawler.

The rubber crawler 1 in FIG. 1 is a so-called inner peripheral drive type rubber crawler, and has a lug 2 that acts on the road surface on the outer peripheral surface side, and transmits the driving force to the rubber crawler itself on the inner peripheral surface side. A drive engagement portion is formed.
The drive engagement portion includes a hard engagement member, which will be described later, embedded in the circumferential direction of the rubber crawler 1 with a certain pitch, and a recess 3 disposed between the engagement members.
For convenience of explanation, the rotation direction of the rubber crawler 1 is referred to as a circumferential direction CD, and a direction perpendicular thereto is referred to as a width direction RD.

A plurality of metal cores 5 serving as hard engaging members are embedded in the rubber crawler 1 at a predetermined pitch at intervals in the circumferential direction CD, with the rubber crawler extending in the width direction RD.
Although the structure of the cored bar 5 will be described in detail later, a pair of corners 5a and 5a are formed on the inner peripheral surface side of the center part as shown in the figure. That is, the corners 5a, 5a formed in a forked shape as a pair protrude inward from the inner peripheral surface of the rubber crawler 1, and this is covered with the same rubber material as the rubber crawler to form the protrusion 4.

And the layer arrange | positioned on the outer side of the metal core 5 is a reinforcing layer which includes the steel cord 6 and extends endlessly in the circumferential direction CD so as to surround each metal core 5.
The steel cord 6 is a tensile member embedded in the rubber crawler 1, and the rubber crawler 1 rotates smoothly based on the driving force received from the sprocket 100 while restricting the expansion of the rubber crawler 1 in the circumferential direction CD. To help.

  A plurality of recesses 3 for receiving the teeth 101 of the sprocket 100 are formed on the inner peripheral surface of the rubber crawler 1. The recess 3 has a shape in which the inner peripheral surface of the rubber crawler 1 is dented to the grounding surface side (outer side) with respect to the standard inner peripheral surface as described above, and the tooth portion 101 of the sprocket 100 is inserted. It is formed to allow.

The concave portion 3 may be formed in the shape of a recess having a bottom surface, or may be a through-hole shape having no bottom surface.
When the recess 3 is a through-hole, a structure with improved discharge performance of mud or gravel can be obtained. Moreover, the contact area with the tooth part 101 can be appropriately adjusted by changing the wall surface shape of the recess 3 with which the tooth part 101 of the sprocket 100 engages (contacts). If the wall surface of the recess 3 is designed so as to increase the contact area, the surface pressure with the tooth portion 101 can be reduced.

Reference numeral 102 denotes a wheel.
The wheel 102 is a load support wheel provided to guide the rubber crawler 1 and stably drive it while supporting a load, and is between a sprocket 100 as a driving wheel and an idler (not shown) as a driven wheel. Arranged as needed.

  FIG. 2 is an enlarged partial cross-sectional view showing an engagement portion between the rubber crawler 1 and the sprocket 100. FIG. 3 is a developed plan view of the inner peripheral surface side of the rubber crawler 1. The structure of the rubber crawler 1 will be described in more detail with reference to these drawings.

The base portion of the cored bar 5 is generally rectangular in plan shape, and is embedded in the rubber crawler 1 with its longitudinal direction extending in the width direction RD. The pair of corners 5a and 5a described above are formed in the central portion of the cored bar 5 in a mutually separated state.
The corner 5a of the metal core 5 has a shape that is longer in the circumferential direction than the dimension in the width direction RD, and has a long shape in the circumferential direction. The rolled wheel 102 can be smoothly guided.

The interval between the pair of corner portions 5a and 5a is set so as to ensure an interval at which the sprocket 100 can smoothly rotate. However, the corner 5a of the metal core 5 formed of a hard material such as metal is covered with the same rubber material as that of the rubber crawler, and becomes a rubber-like protrusion 4 in appearance. Therefore, the sprocket 100 rotates while being guided between the two protrusions 4.
Therefore, the distance between the pair of corners 5a is set to be large in consideration of the thickness of the rubber to be covered.

Now, as clearly shown in FIG. 2, the rubber crawler 1 includes a core metal 5 that is a hard engagement member and a concave portion that is disposed between each of the drive engagement parts that engage with the teeth 101 of the sprocket 100. 3.
More specifically, the metal cores 5 are arranged at equal pitches in the circumferential direction CD, and the recesses 3 are also arranged in a dotted line at equal pitches so that the recesses 3 receive the sprocket teeth every time between them. Yes. The recess 3 is formed so that a standard inner peripheral surface 10 of the rubber crawler 1 is recessed.
And the recessed part 3 is arrange | positioned at equal positions to the circumferential direction CD in the center position in the width direction RD.

In the above structure, the driving force transmitted from the sprocket 100 to the rubber crawler 1 causes the tooth portion 101 of the sprocket 100 to enter the concave portion 3 provided on the inner peripheral surface and engage (contact) with the wall surface of the concave portion 3. Is communicated when
That is, by repeating the operation in which the teeth 101 of the rotating sprocket 100 enter the respective recesses 3 arranged on the inner peripheral surface of the rubber crawler 1 at a constant pitch, the wall surfaces of the recesses 3 are pressed in order. The crawler 1 is rotated.

  In the structure of FIG. 2 described here, the recesses 3 are arranged between the cored bars 5 embedded at a constant pitch as described above. In other words, in this structure, since the cored bar 5 is positioned before and after the recess 3 in the circumferential direction CD, the recess 3 is positioned before and after. And it becomes a strong structure where the back part of the recessed part 3 is supported by the hard metal core 5. FIG. Therefore, the tooth portion 101 of the sprocket 100 can be indirectly engaged with the cored bar 5 under the deformation of the recess 3 to reliably transmit the driving force.

By the way, in the conventional rubber crawler, the sprocket teeth are in contact with the middle of the drive protrusion at a relatively high position, so that the drive protrusion is easily damaged and the durability is inferior. It was.
In contrast, in the above-described rubber crawler 1 according to the embodiment, the tooth portion 101 of the sprocket 100 is engaged with the concave portion 3 formed so as to be recessed from the position of the standard inner peripheral surface 10 to the outer peripheral surface side. The problem of damage to the drive engagement portion due to the engagement of the tooth portion can be reliably suppressed.
Therefore, the rubber crawler 1 according to the embodiment can be provided as a rubber crawler with improved durability.
Further, when the concave portion 3 that is recessed from the standard inner peripheral surface 10 to the outer peripheral surface side is provided in this way, the engagement position (drive transmission point) with which the tooth portion 101 of the sprocket 100 is engaged is lowered. Since the distance from 6 to this engagement position is shortened, a rubber crawler with good driving force transmission efficiency can be obtained.

The rubber crawler 1 of the above-described embodiment is formed to include other structures that are preferably provided in addition to the above-described configuration.
Hereinafter, this point will be described.
Referring to FIGS. 2 and 3 again, a raised surface 20 formed by raising a rubber material is formed on the front and back of the cored bar 5 in the circumferential direction CD. When the inner peripheral surface between the left and right protrusions 4 is lowered, the contact area with the sprocket 100 is reduced and the surface pressure is increased. Therefore, it is desirable to provide a raised surface 20 in which rubber is bulged and raised rather than other standard inner peripheral surfaces 10 before and after the central portion of the core metal 5.

Thus, by providing the raised surface 20 between the pair of left and right corner portions 5a, the contact area between the tooth portion 101 of the sprocket 100 and the inner peripheral surface of the rubber crawler can be increased. For example, the raised surface 20 can be formed by building up rubber so that the bases of the left and right protrusions 4 are continuous below the rolling surface of the rolling wheel 102.
As a result, the surface pressure applied by the tooth portion 101 can be reduced.

  By providing the raised surfaces 20 before and after the core bar 5 in this way, it is possible to reliably prevent contact between the central portion of the core bar 5 and an idler (not shown). If the rubber coating at the center of the core 5 becomes thin due to the use of a rubber crawler for a long time, noise may occur due to unintentional contact with the idler. By providing a raised surface 20 having a thick rubber and a raised portion before and after the metal core 5, noise generation can be prevented.

Further, as shown in FIG. 2, a structure in which a groove 25 extending in parallel with the width direction RD is provided between the metal core 5 and the raised surface 20 is adopted in relation to the structure provided with the raised surface 20. Is more preferable.
When the rubber crawler 1 rotates continuously, it is periodically wound around the sprocket and idler. At this time, a large compressive force acts on the portion inscribed in the cored bar 5 and the rubber is likely to be distorted. Therefore, due to this, the inner peripheral surface of the rubber crawler 1 may be damaged and durability may be reduced.

On the other hand, as shown in FIG. 2, by providing the groove portion 25 so as to secure a space between the core metal 5 and the raised surface 20, strain is concentrated on a part of the inner peripheral surface of the rubber crawler. Can alleviate and prevent damage.
That is, the durability can be further improved by providing the groove portion 25 along the core metal 5.
When manufacturing the rubber crawler 1, it is preferable to embed (incorporate) the core metal 5 in the rubber material while accurately positioning the core metal 5 in the mold. For this purpose, the both sides of the core metal 5 are supported by the support members and positioned. When the support member used in this manner is removed after vulcanization, recesses are formed on both sides of the cored bar 5, so that the recesses may be used to form grooves, and the structure including the grooves 25 described above. Is easy to implement.
These are particularly effective when the groove 25 is formed continuously over the entire width of the raised surface as shown in the figure.

On the other hand, the groove 25 as described above may be formed corresponding to only both side portions in the width direction of the raised surface 20 as illustrated in the enlarged plan view of the main part in FIG. In addition, as illustrated in FIG. 4B, it can be formed corresponding to the central portion of the raised surface 20 in the width direction. In the former case, in the vulcanization mold, especially in the lower mold When the cored bar 5 is positioned and supported at a predetermined position, the cored bar 5 can be supported sufficiently stably at the four positions corresponding to the positions where the groove portions 25 are formed. It is possible to prevent an unexpected position shift or the like in the mold and accurately position it at a predetermined position.
Further, according to the latter shown in FIG. 4B, the product crawler secures a sufficient rubber thickness at the protruding base portion of the corner portion 5a, which is particularly easy to peel off the rubber, and the rubber at the base portion is secured. The possibility of peeling can be effectively removed.

In the above description, the rubber crawler 1 that has improved durability and the like has been described. Hereinafter, an example of a sprocket structure applicable to the rubber crawler 1 will be described.
The sprocket is required to have a structure including a tooth portion that can enter the recess 3 formed on the inner peripheral surface of the rubber crawler 1. Therefore, as shown in FIG. 1 and FIG. 2, the tooth portion may be configured to protrude radially outward from the circular base portion serving as the sprocket body.
The shape of the tooth portion is not particularly limited, and it is desirable that the tooth pressure can be reduced by ensuring a wide contact area when entering the recess 3.

FIG. 5 is a view collectively showing examples of sprockets having teeth that can be engaged with the rubber crawler 1 described above. The sprocket 100 shown in FIGS. 1 and 2 has a shape in which the tooth portion 101 protrudes radially outward from the circular base portion of the main body, which is a general gear shape. The circular base portion and the tooth portion are formed with substantially the same thickness.
The sprocket illustrated in FIG. 5 has a thin circular base portion of the main body. The contact area in the recess 3 of the rubber crawler 1 is a structure in which only the tooth portion is expanded on both sides in the thickness direction (rubber crawler width direction RD) of the circular base portion (projects on both sides in the width direction). We are trying to increase.
In this sprocket, the circular base portion which is the main body is thinned to reduce the weight, and the tooth width is increased to a size corresponding to the inner method of the recess 3 to reduce the surface pressure and guide. We are trying to improve the function.

By the way, FIG. 5 does not limit the circular base portion of the sprocket body. As shown in FIG. 1, the circular base portion may be a single round plate-like member having a certain thickness, or two thin disk members are prepared and arranged facing each other, and the tooth portion is arranged therebetween. It is good also as a structure.
The latter structure is a sprocket structure called a cage type, and teeth are arranged at a predetermined pitch along the peripheral edge of two thin disk members. And what is necessary is just to set so that a tooth | gear part may protrude in the radial direction outward from a disk material.

In the description based on FIGS. 1 to 3, it is described that the tooth portion 101 of the sprocket 100 is engaged only with the concave portion 3 formed on the inner peripheral surface of the rubber crawler 1.
As described above, when the tooth portion 101 of the sprocket 100 is engaged only with the recess 3, the pair of protrusions 4 standing on the inner peripheral surface functions as a guide for the sprocket 100 and the wheel 102. Become.
However, the invention according to the present application is not limited to such an embodiment. For example, you may comprise so that a part of tooth | gear part 101 of the sprocket 100 shown in FIG. That is, as shown in FIG. 6, when the tooth portion 101 enters the recess 3, the upper part of the tooth portion 101 engages with the base portion (near the root of the protruding portion) 4 BS of the protruding portion 4. May be. If such a form is adopted, the recessed portion 3 to be formed can be formed shallower, and therefore the processing of the inner peripheral surface of the rubber crawler 1 can be facilitated. In this case, since the tooth portion 101 engages with the base portion of the projection portion 4 and a force that falls the projection portion 4 does not act, the above-described conventional problems hardly occur.

The rubber crawler 1 described above is formed between the cored bars 5 embedded at a constant pitch, and transmits the driving force by engaging the teeth 101 of the sprocket 100 with the recesses 3 backed up by the cored bar 5. Therefore, the cored bar 5 and the recessed part 3 are not deformed or damaged by the force received from the tooth part 101 of the sprocket 100. Therefore, a rubber crawler with improved durability can be provided.
Moreover, since the position of the driving force transmission point can be brought close to the steel cord, the transmission efficiency of the driving force can be improved. And the rubber crawler can be reliably driven by using together the sprocket which has a tooth part which protrudes outside from the outer edge of the circular base part used as a base.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments described above, and within the scope of the present invention described in the claims, Various modifications and changes are possible.
For example, in the above-described embodiment, the case where the metal core 5 is employed as the hard engagement member is illustrated, but the present invention is not limited thereto, and a material harder than the rubber material forming the rubber crawler, such as hard plastic, is engaged. You may employ | adopt as a member. In the above-described embodiment, the metal core 5 is provided with a corner portion that serves as a base of the protrusion formed on the inner peripheral surface of the rubber crawler. However, a metal core or a hard plastic that does not have such a corner portion is used. It may be adopted.

  As is apparent from the above description, according to the present invention, a rubber crawler with improved durability can be provided. Also, a sprocket suitable for this rubber crawler can be provided together.

DESCRIPTION OF SYMBOLS 1 Rubber crawler 2 Lug 3 Concave part 4 Protrusion part 5 Metal core 5a Corner part 6 Steel cord 10 Standard inner peripheral surface 20 Raised surface 25 Groove part 100 Sprocket 101 Teeth part CD Rubber crawler circumferential direction RD Rubber crawler width direction

The present invention relates to a rubber crawler and a vehicle employed in a traveling portion of a vehicle , and more particularly to a rubber crawler with improved durability of a drive engagement portion and a vehicle using the same .

Therefore, a main object of the present invention is to provide a rubber crawler excellent in durability of the drive engagement portion, and another object is to provide a vehicle using this rubber crawler together. .

The above object has a lug portion on the outer peripheral surface and a drive engagement portion for transmitting a driving force on the inner peripheral surface, and transmits the driving force by engaging a sprocket with the drive engagement portion. The crawler is a rubber crawler, wherein the drive engagement portion is disposed between the engagement member and a hard engagement member embedded at a constant pitch in the circumferential direction of the rubber crawler, look including a recess for receiving the said engaging member are mutually spaced apart in the width direction of the rubber crawler, and includes a pair of corner portions protruding on the inner circumferential surface of the rubber crawler, the circumferential direction of the rubber crawler Thus, this can be achieved by a rubber crawler in which the pair of corners are positioned before and after the recess .

The rubber crawler has a pair of protrusions formed by covering the pair of corners with a rubber material, and the pair of protrusions are positioned before and after the recess in the circumferential direction of the rubber crawler. It is preferable to adopt a structure.
The engaging member is preferably a metal core embedded at a predetermined pitch in the rubber crawler.

Also, it is desirable that the crawler inner peripheral surface is made of rubber and is raised between the pair of corners so as to be raised from the standard inner peripheral surface.
Here, the “standard inner peripheral surface” refers to a plane that passes through the inner peripheral surface side of the rubber crawler at the blade root portion of the cored bar.

Further, it is desirable that the base portion of the core metal has a rectangular planar shape and is embedded in the rubber crawler with the longitudinal direction extending in the width direction of the rubber crawler .
The corner portion preferably has a larger size in the circumferential direction of the rubber crawler than a size in the width direction of the rubber crawler .

Further, the above object has a lug portion on the outer peripheral surface and a drive engagement portion for transmitting a driving force on the inner peripheral surface, and is driven by engaging a sprocket with the drive engagement portion. A vehicle including a rubber crawler to which force is transmitted and a sprocket that engages with the drive engagement portion, wherein the drive engagement portion is a hard engagement embedded at a constant pitch in the circumferential direction of the rubber crawler. And a recess disposed between the engaging members and receiving the sprocket teeth, the engaging members being spaced apart from each other in the width direction of the rubber crawler, and the rubber crawler A pair of corners projecting to the inner peripheral surface side, and when the tooth portion of the sprocket enters the recess of the rubber crawler, a part of the tooth portion engages with the corner portion; also be achieved by vehicle That.
The rubber crawler has a pair of protrusions formed by covering the pair of corners with a rubber material, and when the tooth portion of the sprocket enters the recess of the rubber crawler, It is preferable that a part of the portion engages with the protrusion .

Further, when the inner peripheral surface of the rubber crawler is raised, the contact area between the concave wall surface and the sprocket can be increased, so that the surface pressure can be reduced and the durability can be further improved.

Claims (10)

A rubber crawler having a lug portion on the outer peripheral surface and a drive engagement portion for transmitting a driving force on the inner peripheral surface and transmitting the driving force by engaging a sprocket with the drive engaging portion. Because
The drive engagement portion includes a hard engagement member embedded at a constant pitch in the circumferential direction of the rubber crawler, and a recess that is disposed between the engagement members and receives the sprocket teeth. Rubber crawler made of.   The rubber crawler according to claim 1, wherein the engagement member is formed with a pair of corners protruding toward the inner peripheral surface of the rubber crawler with a space for rolling the sprocket therebetween.   The rubber crawler according to claim 1 or 2, wherein the engaging member is a cored bar embedded in the rubber crawler at a predetermined pitch.   The rubber crawler according to any one of claims 1 to 3, wherein an inner peripheral surface of the crawler between the engaging member and the concave portion is a raised surface provided by raising from a standard inner peripheral surface.   The rubber crawler according to claim 4, wherein a groove extending in the width direction of the rubber crawler is formed between the engaging member and each raised surface.   6. The rubber crawler according to claim 5, wherein a groove extending in the width direction of the rubber crawler is formed continuously over the entire width of the raised surface.   The rubber crawler according to claim 5, wherein the groove is formed so as to correspond to both side portions of the raised surface in the width direction.   The rubber crawler according to claim 5, wherein the groove is formed so as to correspond to a central portion in the width direction of the raised surface. A sprocket applied to the rubber crawler according to any one of claims 1 to 8,
The sprocket includes a circular base portion and a plurality of teeth provided at the peripheral edge of the circular base portion, and the teeth are protruded radially outward from the peripheral edge of the circular base portion. . A sprocket applied to the rubber crawler according to claim 1,
The sprocket includes a circular base portion and a plurality of tooth portions disposed on a peripheral portion of the circular base portion, and the tooth portions protrude from the circular base portion on both sides in the crawler width direction.

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