JP2012081895A - Rubber crawler built-in object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber crawler built-in object capable of suppressing damage to the projections of a rubber crawler even if a high load acts thereon from the tooth section of a sprocket.SOLUTION: The core projection 34 of the rubber crawler 14 forms an overlapped section 36 which is partially overlapped with the engagement tooth section of the sprocket engaged with a crawler projection 26 in the circumferential direction of the rubber crawler 14 within the maximum width portion 34L provided when the rubber crawler 14 is viewed from the side.

Description

  The present invention relates to a rubber crawler assembly.

  As a rubber crawler used in a traveling part of a vehicle such as a construction machine or an agricultural machine, Patent Document 1 discloses that a recess is formed between protrusions on the inner peripheral surface of a rubber crawler, and a sprocket tooth portion enters the recess. Thus, there is described a structure in which the driving force is transmitted from the sprocket to the rubber crawler when engaged (contacted) with the wall surface of the recess.

JP 2009-78796 A

  However, in the structure described in Patent Document 1, even if a high load is applied from the sprocket tooth portion to the protrusion portion of the rubber crawler, particularly the root portion of the sprocket tooth portion, the protrusion portion is not damaged. It was necessary to give strength to the part.

  The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a rubber crawler assembly that can suppress damage to the protrusions of the rubber crawler even when a high load is applied from the sprocket teeth.

  According to the first aspect of the present invention, the rubber crawler is formed endlessly and includes a plurality of crawler protrusions protruding from the inner peripheral surface, and a plurality of tooth portions protruding from the outer peripheral surface at intervals in the circumferential direction. A sprocket that transmits a driving force to the rubber crawler by engagement of the tooth portion with the crawler protrusion, and a maximum width portion that is embedded in the crawler protrusion and has a maximum width when the rubber crawler is viewed from the side. And a cored bar provided with a cored bar projection that overlaps with the toothed part when viewed in the circumferential direction of the rubber crawler in an engaged state between the toothed part and the crawler projection.

  In this rubber crawler assembly, the driving force is transmitted to the rubber crawler when the sprocket rotates with the sprocket teeth engaged with the crawler protrusions of the rubber crawler. A cored bar projection of the cored bar is embedded in the crawler projection, and the maximum width part of the cored bar projection is overlapped with the toothed part when viewed in the circumferential direction of the rubber crawler when the toothed part and the crawlered protrusion are engaged. ing. That is, since the cored bar projection is provided from the sprocket tooth portion to the portion receiving the driving force, even when a high load is applied to the crawler projection, the crawler projection can be prevented from being damaged.

  According to a second aspect of the present invention, in the first aspect of the present invention, the protruding portion of the tooth portion is formed with a protruding portion protruding on both sides in the width direction of the sprocket, and the protruding portion is connected to the crawler protrusion. The driving force is transmitted by the engagement.

  Since the protruding portion of the tooth portion protrudes on both sides in the width direction of the sprocket, a larger contact area with the crawler protrusion can be secured as compared with a tooth portion having a structure in which such a protruding portion is not formed. And also in the structure which a protrusion part and a crawler protrusion engage, since the metal core protrusion is provided to the part which receives a driving force from a protrusion part, damage to a crawler protrusion can be suppressed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, at the root portion of the crawler protrusion, when the rubber crawler is viewed from the side, the rubber crawler is in a circumferential direction rather than the maximum width portion. A wide rubber wide part is formed.

  By providing the rubber wide portion at the base portion of the crawler protrusion, a part of the sprocket tooth portion comes into contact with the wide portion, that is, the rubber portion. For this reason, generation | occurrence | production of a noise is suppressed compared with the structure which the whole tooth | gear part of a sprocket contacts a metal part. In addition, since the cored bar projection is smaller than the configuration in which the cored bar projection is entirely provided including the root part of the crawler projection, the weight of the rubber crawler assembly can be reduced and the cost can be reduced. .

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a rising angle of a circumferential end surface of the crawler protrusion from a rubber crawler inner circumferential surface in a side view of the rubber crawler. However, it is made smaller than the base portion side on the projecting end side than the maximum width portion of the core metal projection.

  Therefore, the sprocket teeth are difficult to contact the protruding end side of the crawler protrusion (core metal protrusion), and the generation of noise can be more effectively suppressed.

  According to a fifth aspect of the present invention, in the first aspect of the present invention, the rubber crawler has an inner peripheral surface on the outer peripheral side at a position between the plurality of crawler protrusions. The housing recess is formed so as to partially accommodate the tooth portion.

  By accommodating the tooth portion of the sprocket in the housing portion, the engaged state between the tooth portion and the crawler protrusion can be reliably shifted and maintained. In addition, since the load acts on the root portion (or the portion close to the root) of the core metal protrusion, it is possible to make a configuration in which an excessive rotational moment is not applied to the core metal protrusion.

  Since the present invention is configured as described above, it is possible to suppress damage to the protrusions of the rubber crawler even when a high load is applied from the sprocket teeth.

It is a perspective view which expands and shows the rubber crawler built-in body of 1st Embodiment of this invention in a sprocket and its vicinity. The rubber crawler built-in body of 1st Embodiment of this invention is shown partially, (A) is a top view, (B) is the BB sectional drawing of (A). It is sectional drawing which shows the rubber crawler built-in body of 1st Embodiment of this invention in the cross section along the circumferential direction of a rubber crawler. It is sectional drawing which shows the rubber crawler built-in body of 2nd Embodiment of this invention in the cross section along the circumferential direction of a rubber crawler.

  1 and 2 partially show the rubber crawler assembly 12 according to the first embodiment of the present invention. The rubber crawler built-in body 12 is provided with a rubber crawler 14 formed in an endless belt shape with rubber. As shown in FIG. 2, rubber crawler cores 18 are embedded in the rubber crawler 14 at regular intervals along the circumferential direction. Hereinafter, the circumferential direction of the rubber crawler 14 refers to a direction along the longitudinal direction of the endless rubber crawler. In addition, simply referring to the “width direction” refers to the width direction of the rubber crawler 14. However, the width direction of the cored bar projection 34 described later refers to the width in the direction that appears when the rubber crawler 14 is viewed from the side (see FIG. 3).

  As shown in FIG. 3, the rubber crawler 14 has a substantially flat lower portion as a ground contact portion 14T. Hereinafter, the ground contact portion 14T side refers to the lower side of the rubber crawler 14 in the state shown in FIG.

  A sprocket 20 and an idler (not shown) are disposed on the inner peripheral side of the rubber crawler 14. Engagement teeth 22 protrude from the sprocket 20 at regular intervals along its circumferential direction. A protruding portion 24 that protrudes in the width direction of the sprocket 20 is formed on the front end (protruding end) side of the engaging tooth portion 22.

  As shown in detail in FIG. 3, the protrusion 24 has a flat surface 24 </ b> F that is located on the radially inner side of the sprocket 20. The projecting portion 24 has a substantially triangular shape with the flat surface 24F as a base and extends outward in the radial direction of the sprocket 20, and has a side surface 24S. Further, a distal end curved surface 24 </ b> R that is curved with a predetermined curvature in a side view of the rubber crawler 14 is formed on the distal end side of the protruding portion 24.

  On the other hand, as shown in FIGS. 1 and 2, a crawler protrusion 26 is formed at the center in the width direction of the rubber crawler 14. The crawler protrusions 26 protrude inward from the inner peripheral surface of the rubber crawler 14 and are formed to be paired with a certain interval in the width direction. A pair of crawler protrusions 26 are formed at regular intervals along the circumferential direction. As will be described later, when the sprocket 20 is rotationally driven in a state where the engagement tooth portion 22 of the sprocket 20 is engaged with the crawler protrusion 26, the driving force of the sprocket 20 is transmitted to the rubber crawler 14 by this engagement. .

  An accommodation recess 28 is further formed in the central portion of the rubber crawler 14 in the width direction. The accommodating recesses 28 are formed at regular intervals in the circumferential direction in the portion between the crawler protrusions 26. As shown in FIG. 3, the accommodation recess 28 accommodates the tip portion of the engagement tooth portion 22 of the sprocket 20 (part of the protrusion 24, particularly the portion including the tip curved surface 24R). Thus, the engagement state between the engagement tooth portion 22 and the crawler protrusion 26 can be more reliably maintained. In FIG. 3, the accommodation recess 28 is formed in a hollow shape having a bottom on the outer peripheral surface side of the rubber crawler 14, but is not limited thereto, and the accommodation recess 28 may be, for example, the rubber crawler 14. It may be a through-hole shape that penetrates to the outer peripheral surface.

  When the rubber crawler 14 is viewed from the side, the end surfaces (circumferential end surfaces 26E) appearing on both sides of the crawler projection 26 are closer to the root portion 26K (from the maximum width portion 34L of the core metal projection 34 described later), as can be seen from FIG. The rising angle θ2 at the protruding end portion 26S is smaller than the rising angle θ1 at the outer peripheral side.

  As shown in FIG. 2A, a plurality of rubber crawler cores 18 are embedded in the rubber crawler 14 at a constant interval (same pitch as the crawler protrusions 26) in the circumferential direction. The rubber crawler mandrel 18 has a central portion 30 located in the central portion in the width direction of the rubber crawler 14 and wing portions 32 extending from the central portion 30 to both sides in the width direction. Further, the core member 18 for rubber crawler has a pair of core metal projections 34 erected so as to protrude from the boundary portion between the central portion 30 and the wing portion 32. The core metal protrusion 34 is embedded in the crawler protrusion 26.

  As shown in FIG. 3, when the rubber crawler 14 is viewed from the side, the core metal protrusion 34 of the present embodiment is a gradually amplifying portion 34Z having a width W1 that gradually increases from the protruding end 34S toward the root portion 34K. The intermediate portion in the direction (projection direction) has a maximum width portion 34L. Then, from the maximum width portion 34L to the root portion 34K, a narrow portion 34N having a partially narrowed width W1 is formed. In the constricted portion 34N, the width W1 of the core metal projection 34 is narrow, but the wide portion 26W that widens the crawler projection 26 is formed by the rubber constituting the rubber crawler 14. The wide portion 26 </ b> W has a width in a range further expanding in the circumferential direction of the rubber crawler 14 than the maximum width portion 34 </ b> L of the core metal protrusion 34.

  In particular, assuming a virtual line GL obtained by extending the ridge line of the wide portion 26W upward, the cored bar protrusion 34 is in a position retracted in a direction away from the engaging tooth portion 22 from the virtual line GL. A part of the rubber constituting the rubber crawler 14 is a thin film rubber 14 </ b> C and covers the periphery of the core metal protrusion 34 in a thin film shape.

  As shown in FIG. 3, the shape of the core metal projection 34 is such that the protrusion 24 of the engagement tooth portion 22 engaged with the crawler projection 26 (accommodated in the accommodation recess 28), particularly at its maximum width portion 34 </ b> L, By overlapping partially when viewed in the circumferential direction of the rubber crawler 14, the overlapping portion 36 is formed.

  In the rubber crawler 14, a steel cord or the like is embedded on the outer peripheral surface side of the rubber crawler core 18 to constitute a reinforcing layer 40. The steel cord is an endless metal cord, and is deformed so that it can be wound around the sprocket 20 and the idler while suppressing the circumferential extension of the rubber crawler 14. The rubber crawler 14 is assisted to rotate smoothly by the driving force acting from the sprocket 20.

  Next, the operation of the rubber crawler assembly 12 of this embodiment will be described.

  The engaging tooth portion 22 of the sprocket 20 is housed in the housing recess 28 of the rubber crawler 14. When the sprocket 20 is rotationally driven in this state, the engaging tooth portion 22 (particularly, the protruding portion 24 in the present embodiment) is engaged with the crawler protrusion 26, so that the driving force is transmitted from the sprocket 20 to the rubber crawler 14. Is done.

  Here, as shown in FIG. 3, in the rubber crawler assembled body 12 of the present embodiment, the overlapping portion that partially overlaps the engaging tooth portion 22 in the circumferential direction on the core metal projection 34 of the rubber track core 18. 36 is configured. In such a rubber crawler assembly in which the overlapping portion 36 is not configured, the root portion of the crawler protrusion 26 is pressed by the engaging tooth portion 22 and a high load acts on the root portion, so that it is necessary to prevent damage to the root portion. There is.

  However, in the rubber crawler built-in body 12 of this embodiment, the overlapping portion 36 is formed on the core metal projection 34 as described above, and a part of the load from the engagement tooth portion 22 is made of a metal core metal projection. Therefore, damage to the root portion of the crawler protrusion 26 can be suppressed.

  In the present embodiment, the maximum width portion 34L formed on the core metal projection 34 receives a large driving force from the engagement tooth portion 22 of the sprocket 20, and the overlapping portion 36 is configured in the maximum width portion 34L. Has been. That is, the engagement tooth portion 22 and the core metal protrusion 34 overlap each other at a site where the driving force acts greatly from the engagement tooth portion 22, and damage to the root portion of the crawler protrusion 26 can be effectively suppressed.

  Further, in the present embodiment, the crawler protrusion 26 is formed with a wide rubber portion 26W, and a part of the engaging tooth portion 22 contacts the wide portion 26W. For this reason, the generation of noise is further suppressed as compared with a structure in which the entire engaging tooth portion 22 hits the cored bar protrusion 34. Moreover, compared to the configuration in which the cored bar projection 34 is provided up to the wide portion 26W of the crawler projection 26, the cored bar projection 34 is reduced in size so that the entire rubber crawler assembly 12 can be reduced in weight and cost. It becomes possible to plan.

  When the metal engagement tooth portion 22 and the cored bar projection 34 are in direct contact with each other, there is a concern about the generation of metal sound. However, in the present embodiment, as described above, the cored bar projection 34. Is a position retracted in a direction away from the engagement tooth portion 22 with respect to the virtual line GL from the housing recess 28. Therefore, the above-described metal sound can be suppressed. Note that the generation of metallic noise is a concern when a large driving force is applied to the rubber crawler 14 from the sprocket 20. For example, during high speed running, the rubber is caused by friction between the engaging tooth portion 22 and the rubber crawler 14. Since the crawler 14 is driven, there is a low possibility that such a metallic noise is generated.

  In addition, the circumferential end surface 26E of the crawler protrusion 26 has a smaller rising angle θ2 on the protruding end portion 26S side than the rising angle θ1 on the root portion 14K side. Therefore, the engagement tooth portion 22 of the sprocket 20 is also prevented from coming into contact with the protruding end side of the core metal protrusion 34 and generating a metallic sound.

  As described above, a part of the rubber constituting the rubber crawler 14 covers the periphery of the core metal protrusion 34 as a thin film rubber 14C in a thin film shape. The thin film rubber 14C is gradually worn away, but at least in the initial use of the rubber crawler 14, the presence of the thin film rubber 14C further suppresses the generation of the metal sound. In particular, in this embodiment, the rising angle of the circumferential end surface 26E of the crawler protrusion 26 is small on the protruding end side portion 26S side, and the engagement tooth portion 22 is prevented from contacting the protruding end side of the core metal protrusion 34. Therefore, wear of the thin film rubber 14C on the protruding end side of the cored bar protrusion 34 can be suppressed.

  FIG. 4 is a partially enlarged sectional view of the rubber crawler built-in body 52 according to the second embodiment of the present invention. Below, only a different point from 1st Embodiment is demonstrated as 2nd Embodiment, the same code | symbol is attached | subjected about the component, member, etc. similar to 1st Embodiment, and detailed description is abbreviate | omitted. Moreover, since the whole structure of the rubber crawler built-in body 52 of 2nd Embodiment is also the same as that of FIG. 1 which concerns on 1st Embodiment, illustration is abbreviate | omitted.

  In the rubber crawler built-in body 52 of the second embodiment, the core metal projection 54 is configured with a width gradually increasing portion 54Z in which the width W1 gradually increases from the protruding end 54S toward the root portion 54K, and the maximum width portion 54L. It is formed at a position closer to the outer peripheral surface of the rubber crawler 14 than the maximum width portion 34L of the core metal protrusion 34 of the first embodiment (lower side in FIG. 4), and is wider than the wide portion 26W of the first embodiment. ing. Therefore, compared with the rubber crawler built-in body 12 of the first embodiment, the range of the overlapping portion 56 with the protruding portion 24 of the sprocket 20 is wider in the height direction of the core metal protrusion 54.

  Thus, in the rubber crawler built-in body 52 of the second embodiment, the overlapping portion 56 between the engaging tooth portion 22 of the sprocket 20 and the core metal protrusion 54 is wide, and the driving force acting from the engaging tooth portion 22 is Since it will receive in a wider range, the damage of the root part of the crawler protrusion 26 can be suppressed more effectively.

  Of course, also in the rubber crawler built-in body 12 of 1st Embodiment, the damage of the root part of the crawler protrusion 26 can be effectively suppressed as mentioned above. In the first embodiment, the mandrel protrusion 34 is reduced in size, so that the weight can be reduced as compared with the second embodiment.

  As described above, the overlapping portion according to the present invention is seen in the circumferential direction of the rubber crawler 14 in a state where the engagement tooth portion 22 of the sprocket 20 is positioned (engaged) between the crawler protrusions 26. Therefore, it is only necessary that the engaging tooth portion 22 and the core metal protrusion 34 overlap each other. Therefore, as the position of the maximum width portion 34L of the core metal protrusion 34, for example, with respect to the engaging tooth portion 22 on which the protruding portion 24 is formed, from the flat surface 24F of the protruding portion 24 to the tip portion of the side surface 24S ( The position may be within the range of the boundary portion between the side surface 24S and the distal curved surface 24R.

  Further, as can be seen from FIGS. 3 and 4, in the configuration in which the engaging tooth portion 22 (projecting portion 24) is accommodated in the accommodating recess 28, the engaging tooth portion 22 is located at a position close to the root portion 34 </ b> K of the core metal protrusion 34. Since the driving force is applied, the rotational moment in the direction of arrow R1 acting on the core metal protrusion 34 is reduced, and the posture of the rubber crawler core 18 can be stably maintained. In addition, in the configuration in which the engagement tooth portion 22 (projection portion 24) is accommodated in the accommodation recess 28, the engagement tooth portion 22 engages with the rubber crawler 14 at a position close to the reinforcing layer 40. And damage can be more effectively suppressed.

12 Rubber crawler assembly 14 Rubber crawler 14K Root portion 14E Circumferential end face 14C Thin film rubber 18 Rubber crawler core 20 Sprocket 22 Engaging tooth portion 24 Projection portion 26 Crawler projection 26W Wide portion 28 Housing recess 34 Core metal projection 34L Large part 34S Gradual amplification part 36 Overlapping part 40 Reinforcing layer 52 Rubber crawler built-in body 54 Metal core protrusion 54L Maximum width part 56 Overlapping part θ1 Rising angle θ2 Rising angle

Claims (5)

A rubber crawler that is formed in an endless shape and has a plurality of crawler protrusions protruding from the inner peripheral surface;
A sprocket including a plurality of teeth protruding from the outer peripheral surface at intervals in the circumferential direction, and transmitting a driving force to the rubber crawler by engagement of the teeth with the crawler protrusion;
In the maximum width portion embedded in the crawler protrusion and having the maximum width when the rubber crawler is viewed from the side, the teeth are viewed in the circumferential direction of the rubber crawler in an engaged state of the tooth portion and the crawler protrusion. A cored bar with a cored bar projection that overlaps the part,
A rubber crawler assembly comprising: On the projecting end side of the tooth part, a projecting part projecting on both sides in the width direction of the sprocket is formed,
The rubber crawler assembly according to claim 1, wherein the protrusion transmits the driving force by engagement with the crawler protrusion.   3. The rubber according to claim 1, wherein a rubber wide portion that extends in a circumferential direction of the rubber crawler is formed at a base portion of the crawler protrusion in a circumferential direction of the rubber crawler when the rubber crawler is viewed from the side. Crawler built-in body.   The rising angle of the circumferential end surface of the crawler projection from the rubber crawler inner circumferential surface in a side view of the rubber crawler is smaller than the root portion side on the projecting end side than the maximum width portion of the core metal projection. The rubber crawler built-in body according to any one of claims 1 to 3.   The said rubber crawler is formed with the accommodation recessed part which accommodates the said tooth | gear part partially by denting an inner peripheral surface of a rubber crawler to the outer peripheral side in the position between the said some crawler protrusion. Item 5. The rubber crawler assembly according to any one of items 4 to 5.

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