JP5097482B2 - Rubber crawler and core for rubber crawler - Google Patents

Description

  The present invention relates to a rubber crawler employed in a traveling portion of a vehicle and a core metal used for a driving protrusion thereof, and more particularly to a rubber crawler and a core metal capable of suppressing damage to a driving protrusion and generation of noise during traveling. .

  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. Among such rubber crawlers, there is a rubber crawler in which a core metal is embedded and arranged at a predetermined pitch in the circumferential direction of the rubber crawler for reinforcement, shape maintenance, and the like. A rubber crawler is disclosed.

  The core metal embedded in the rubber crawler includes a flat core metal body elongated in the width direction of the rubber crawler, and a pair of elongate members extending in the width direction of the rubber crawler. The surface of the corner facing the circumferential direction of the rubber crawler is covered with a rubber material, and a pair of bifurcated drive protrusions are provided in the circumferential direction on the inner circumferential surface side of the rubber crawler. A large number are arranged side by side at a pitch.

  When such a rubber crawler is hung between a sprocket and an idler provided on the fuselage, the sprocket disc and idler pass between the bifurcated drive projections and between the sprocket and the idler. A plurality of wheels provided on the airframe are arranged so as to pass through both outer sides of the bifurcated drive protrusion. When the vehicle is traveling, the sprocket engages the bifurcated drive projections with the drive pins erected in the outer peripheral edge portions of the both sides of the disk portion in the axial direction of the sprocket. A plurality of rolling wheels that are transmitted to the crawler side and guided by the drive protrusions and prevented from coming off the rubber crawler support the rubber crawler and press it against a running surface such as the ground.

  In the conventional rubber crawler having such a configuration, each of the pair of bifurcated drive projections is set to be long in the width direction of the rubber crawler, and the contact surface of the drive projection with respect to the drive pin of the sprocket is widened. Since the contact surface of the protrusion is made of a rubber material that covers the core metal, the rubber is efficiently passed through the core metal while suppressing damage to the drive protrusion caused by the drive pin of the sprocket and the generation of noise during traveling. A rubber crawler can be driven by transmitting a driving force to the crawler.

JP-A-11-198871

  By the way, the conventional rubber crawler does not sufficiently consider the rolling of the wheel on the driving protrusion. That is, in the rubber crawler described in Patent Document 1, in the circumferential direction of the rubber crawler with which the drive pin of the sprocket is engaged, the corner of the core metal is covered with a thick rubber material to form the drive protrusion. When rolling wheels run on the drive protrusion due to severe driving conditions, etc., the rubber material covering the corners is easily deformed and easily lost, and if this rubber material is missing, In addition to the deterioration of the rolling slip prevention guide function, the appearance quality of the rubber crawler also deteriorates, so there is still room for improvement in this respect.

  Accordingly, an object of the present invention is to provide a rubber crawler that prevents a decrease in the guide function of preventing the drive protrusion from falling off the roll and prevents a decrease in appearance quality even if the drive wheel rides on the drive protrusion. An object of the present invention is to provide a core bar used for a driving projection of a rubber crawler.

The rubber crawler according to the present invention that has advantageously solved the above problems embeds a core metal comprising a flat core metal body and a pair of corners standing on the metal core body, and each corner of the metal core is embedded. part of a rubber crawler by forming a driving protrusion is coated with a rubber material, wherein the tip of each corner, the size of the click row La widthwise and LW, the click row La circumferential dimension As LC, LW ≦ LC is provided, and a constricted portion made of a wall recessed in an arc cross-sectional shape is provided between the tip of each corner and the core body in the crawler circumferential direction toward the center of the corner. It is characterized by that.

The rubber crawler core bar of the present invention that has advantageously solved the above problems is used in the rubber crawler comprising a flat core metal body and a pair of corners standing on the core metal body. a core metal for a rubber crawler, wherein the tip of each corner, the size of the click row La widthwise and LW, the click row La circumferential dimension as LC, as the LW ≦ LC, the A constricted portion made of a wall surface recessed in an arc cross-sectional shape is provided between the distal end portion of each corner portion and the core metal body in the crawler circumferential direction toward the center portion of the corner portion .

  According to the rubber crawler of the present invention, the corners standing on the core metal body are covered with the rubber material to form the drive projections, so the drive pins of the sprocket are the corners of the core metal of the drive projections. Since the driving force is transmitted in contact with the supported rubber material, the driving force is efficiently applied to the rubber crawler via the metal core while suppressing the breakage of the driving protrusion by the driving pin of the sprocket and the generation of noise during traveling. The rubber crawler can be driven by transmission.

Moreover, according to the rubber crawler of the present invention, the tip of each corner, the size of the click row La widthwise and LW, the click row La circumferential dimension as a LC, such that LW ≦ LC In other words , since the circumferential tip portion dimension LC of the rubber crawler is equal to or larger than the corner tip portion dimension LW of the rubber crawler in the width direction, the tip portion of the corner portion of the metal core is The rubber material that covers the corners of the rubber crawler with sufficient thickness in the circumferential direction of the rubber crawler is sufficiently supported, so that the rolling wheels cover the corners of the core metal of the drive protrusions during running. Since the rubber material is not greatly deformed even when it rides on the rubber material, the rubber material is not easily lost. Further, even if the rubber material is missing, the tip of the corner that does not change in shape from the drive protrusion appears immediately. Therefore, according to the rubber crawler of the present invention, even if the rolling wheel rides on the driving protrusion, the guide function of the driving protrusion is prevented from being deteriorated and the appearance quality of the rubber crawler is also prevented from being deteriorated. can do.

Since the drive pin of the sprocket contacts the rubber material covering the portion of the drive projection between the corner tip of the core metal and the core metal body that faces the circumferential direction of the rubber crawler, the drive force is transmitted. the between the tip portion and the metal core body of each corner, by providing the constricted portion consists wall recessed with click row La circumferential direction to the corner portion center side in an arc sectional shape, coating the constricted portion The rubber material that comes into contact with the drive pin of the sprocket can be supported sufficiently firmly by the tip of the corner and the metal core body, which can cause damage to the drive protrusion by the drive pin of the sprocket and noise during traveling. Generation | occurrence | production can be suppressed reliably.

In the rubber crawler of the present invention, the pre Kikuku Re thickness of the rubber material that covers the parts and the larger than the thickness of the rubber material covering the tip end portion of each corner preferable. If the thickness of the rubber material covering the constricted portion of the corner is made larger than the thickness of the rubber material covering the tip of the corner portion, the drive protrusion can be designed into a tapered shape as a whole, and the rubber material is molded. In the process and rubber crawler vulcanization process, the drive protrusion can be easily pulled out from the mold, and the large thickness of the rubber material covering the constricted part causes damage to the drive protrusion due to the sprocket drive pin and running. Generation of noise inside can be more reliably suppressed.
Moreover, in the rubber crawler of this invention, it is preferable to connect the lower part of the constricted part of each said corner | angular part with a reinforcement rib, and to integrate the said pair of corner | angular part.

  According to the rubber crawler core bar of the present invention, the same effects as those described above of the rubber crawler of the present invention can be obtained by using the rubber crawler drive protrusion of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing only a part of the rubber crawler according to the embodiment of the present invention, FIG. 2 is a bottom view showing only a part of the rubber crawler according to the above-described embodiment. FIG. 4 is a cross-sectional view of the rubber crawler of the above embodiment along the line AA in FIG. 1, FIG. 4 is a cross-sectional view of the rubber crawler of the above embodiment along the line BB in FIG. FIG. 6 is a cross-sectional view of the rubber crawler of the above embodiment, taken along line CC in FIG. 1, and FIGS. 6A, 6B, 6C and 6D are used for the rubber crawler of the above embodiment. FIG. 7 is a plan view, a front view, a side view, and a cross-sectional view taken along the line DD in FIG. 6A, showing an embodiment of the core for a rubber crawler of the present invention.

  In the figure, reference numeral 1 denotes a rubber crawler of the above embodiment, 10 denotes a rubber crawler core metal of the above embodiment, and a rubber crawler core metal (hereinafter simply referred to as “core metal”) 10 of this embodiment is shown in the figure. As shown in detail in FIG. 6, a flat cored bar body 11 and a pair of corners 12 standing on the cored bar body 11 are provided.

  On the other hand, the rubber crawler 1 of this embodiment has a large number of core bars 10 in the circumferential direction of the rubber crawler 1 (vertical direction in FIG. 1) in order to reinforce and support the rubber material constituting the rubber crawler 1. A plurality of drive projections 2 that protrude in pairs in a bifurcated manner on the inner peripheral surface side of the rubber crawler 1 are formed by covering the corner portions 12 of the cored bar 10 with rubber materials. A large number of lugs 3 that are formed side by side at a predetermined pitch in the circumferential direction of the rubber crawler 1 and project in the outer circumferential surface side of the rubber crawler 1 and extend in the width direction of the rubber crawler 1 (left-right direction in FIG. 2), These are endless annular members formed at positions between the cored bars 10 and having a normal steel cord embedded in the outer side of the cored bar body 11.

  The cored bar body 11 of the cored bar 10 here is a substantially rectangular plate material, and the cored bar 10 has a longitudinal direction of the cored bar body 11 parallel to the width direction of the rubber crawler 1 and corner portions 12. It is embedded in the rubber crawler 1 so as to protrude from the core metal body 11 toward the inner peripheral surface of the rubber crawler 1. The pair of corners 12 are erected integrally with the cored bar body 11 at a central portion of the cored bar body 11 so as to be spaced apart from each other, whereby the cored bar 10 includes a pair of corners 12 having a bifurcated shape. It is formed into a shape. As shown in FIGS. 1 and 6 (a), the tip of each corner 12 has a tapered, generally chevron shape, the thickness of the tip of the rubber crawler 1 in the width direction is LW, and the rubber crawler 1 When the thickness of the tip in the circumferential direction is LC, the circumferential thickness LC is larger (LW <LC).

  Further, a constricted portion 13 is provided on each side portion of the pair of corner portions 12 facing the circumferential direction of the rubber crawler 1, and the constricted portion 13 is provided between the tip end portion of the corner portion 12 and the core metal body 11. This portion is recessed to the center side of the corner portion 12. As described above, when the constricted portions 13 are provided on both side surfaces of the pair of corner portions 12 in the circumferential direction of the rubber crawler 1, the corner portions 12 are formed when the core metal 10 is embedded to form the rubber crawler 1. The thickness of the rubber material from the middle of the drive protrusion 2 to the periphery of the root portion can be increased on both sides in the circumferential direction of the rubber crawler 1 of the pair of drive protrusions 2 formed based on the above. Further, a reinforcing rib 14 that connects the corner portions 12 is formed integrally with the core metal body 11.

  In the rubber crawler 1 of this embodiment using the cored bar 10, each drive projection 2 covers the pair of corners 12 of each cored bar 10 with a rubber material, as shown in FIGS. Here, the shape of each drive projection 2 viewed from the width direction of the rubber crawler 1 is tapered as shown in FIGS. 4 and 5 because the constricted portion 13 is filled with a rubber material. It is formed in the general chevron shape. Such a rubber crawler 1 can be manufactured by a process similar to the conventional one. That is, a convex portion that fills the constricted portion 13 formed at the corner portion 12 of the cored bar 10 is formed on the rubber material in the rubber material molding step. By using such a rubber material, it is possible to manufacture the rubber crawler 1 including the driving protrusion 2 in which the constricted portion 13 is filled with rubber.

  FIGS. 7 to 9 show, in a cross-section between the core bars 10, a state in which the rubber crawler 1 of the above embodiment is supported between the sprocket 21 and the idler 24 of the airframe (not shown) and supported by the rolling wheels 25. 7 is a state in which the rubber crawler 1 and the sprocket 21 are engaged, FIG. 8 is a state in which the rubber crawler 1 and the idler 24 are engaged, and FIG. 9 is a state in which the rubber crawler 1 and the wheel 25 are engaged. And FIG. FIG. 10 is a cross-sectional view of the rubber crawler 1 and the sprocket 21 engaged with each other at the same position as in FIG.

  As shown in these figures, according to the rubber crawler 1 of this embodiment, the corners 12 erected on the metal core body 11 are covered with a rubber material to form the drive protrusions 2. The drive pin 23 of the metal core 10 of the drive protrusion 2 is a drive pin 23 erected on the outer peripheral edge portions of both surfaces of the disk portion 22 in the axial direction of the sprocket 21 (left-right direction in FIG. 7 and direction orthogonal to the paper surface in FIG. 10). Since the driving force is transmitted in contact with the rubber material supported by the corner portion 12 of the sprocket 21, the damage to the driving protrusion 2 by the driving pin 23 of the sprocket 21 and the generation of noise during traveling are suppressed and the core metal 10 is used. The rubber crawler 1 can be driven by efficiently transmitting a driving force to the rubber crawler 1.

  Moreover, according to the rubber crawler 1 of this embodiment, the relationship between the width direction dimension LW of the rubber crawler 1 and the circumferential dimension LC of the rubber crawler 1 at the tip end portion of the corner portion 12 of the metal core 10 is expressed as LW <LC. As described above, since the corner tip portion dimension LC in the circumferential direction of the rubber crawler 1 is larger than the corner tip portion dimension LW in the width direction of the rubber crawler 1, the tip portion of the corner portion 12 of the core metal 10 is made of rubber. Since the rubber material covering the corner portion 12 has a sufficient thickness in the circumferential direction of the crawler 1 and sufficiently supports it, the two wheels 26 of the rolling wheels 25 as shown in FIG. Since the rubber material is not greatly deformed even if it rides on the rubber material covering the corner portion 12 of the driving projection 2, the rubber material is not easily lost. Further, even if the rubber material is missing, the tip end portion of the corner portion 12 whose shape does not change so much from that of the drive protrusion 2 appears immediately. Therefore, according to the rubber crawler 1 of this embodiment, even if the rolling wheel 25 rides on the driving protrusion 2, it is possible to prevent the guide protrusion function of the driving protrusion 2 from deteriorating and to prevent the rubber crawler 1 from moving. It is also possible to prevent deterioration in appearance quality.

  Furthermore, according to the rubber crawler 1 of this embodiment, the constricted portion 13 that faces the circumferential direction of the rubber crawler 1 is provided between the tip end portion of the corner portion 12 and the core metal body 11, and the drive pin of the sprocket 21 is provided. As is clear from FIG. 10, the rubber material 23 covers the portion of the drive protrusion 2 that faces the circumferential direction of the rubber crawler 1 between the tip of the corner 12 of the core 10 and the core body 11. Since the driving force is transmitted in contact with the rubber member, the rubber member that covers the constricted portion 13 and contacts the driving pin 23 of the sprocket 21 is sufficiently firmly supported by the tip end portion of the corner portion 12 and the core metal body 11. As a result, it is possible to reliably suppress the breakage of the drive protrusion 2 by the drive pin 23 of the sprocket 21 and the generation of noise during traveling.

  Furthermore, according to the rubber crawler 1 of this embodiment, as shown in FIGS. 5 and 10, the thickness of the rubber material covering the constricted portion 13 of the corner portion 12 is set to the rubber covering the tip portion of the corner portion 12. Since the thickness of the material is larger than the thickness of the material, the drive protrusion 2 can be designed to have a tapered shape as a whole, and it is easy to extract the drive protrusion from the mold in the rubber material molding process and the rubber crawler 1 vulcanization process. In addition to being able to squeeze, the large thickness of the rubber material covering the constricted portion 13 can more reliably suppress the breakage of the drive projection 2 by the drive pin 23 of the sprocket 21 and the generation of noise during traveling.

  And according to the metal core 10 of this embodiment, by using it for the drive projection 2 of the rubber crawler 1 of the above embodiment, the same operation effects as the above-described operation effects of the rubber crawler 1 of the above embodiment can be obtained. it can.

  While the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made within the scope described in the claims. For example, assuming that the thickness in the width direction of the rubber crawler is LW and the thickness in the circumferential direction of the rubber crawler is LC, the thickness LW in the width direction and the thickness LC in the circumferential direction at the end of each corner of the core metal Are equal (LW = LC), the same effects as described above can be obtained.

  Thus, according to the rubber crawler and the core for rubber crawler of the present invention, even if the rolling wheel rides on the driving projection, the guide function of preventing the driving projection from falling off is prevented, and the appearance of the rubber crawler A decrease in quality can also be prevented.

It is a top view which shows only a part in the state which developed one example of a rubber crawler of this invention. It is a bottom view which shows only a part in the state which expand | deployed the rubber crawler of the said Example. It is sectional drawing which follows the AA line in FIG. 1 of the rubber crawler of the said Example. It is sectional drawing which follows the BB line in FIG. 1 of the rubber crawler of the said Example. It is sectional drawing which follows the CC line | wire in FIG. 1 of the rubber crawler of the said Example. (A), (b), (c), and (d) are a plan view, a front view, a side view, and a side view showing an embodiment of the core for a rubber crawler of the present invention used in the rubber crawler of the above-described embodiment, It is sectional drawing which follows the DD line in (a). It is sectional drawing in the direction similar to FIG. 3 which shows the engagement state of the rubber crawler of the said Example, and a sprocket in the cross section between core bars. It is sectional drawing in the direction similar to FIG. 3 which shows the engagement state of the rubber crawler and idler of the said Example by the cross section between core bars. It is sectional drawing in the direction similar to FIG. 3 which shows the engagement state of the rubber crawler of the said Example, and a wheel with the cross section between core bars. It is sectional drawing in the position similar to FIG. 5 which shows the engagement state of the rubber crawler of the said Example, and a sprocket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rubber crawler 2 Drive protrusion 3 Lug 10 Core metal 11 Core metal main body 12 Corner | angular part 13 Constriction part 14 Reinforcement rib 21 Sprocket 22 Disk part 23 Drive pin 24 Idler 25 Rolling wheel 26 Wheel

Claims (4)

A metal core comprising a flat metal core body and a pair of corners erected on the metal core body is embedded, and each corner of the metal core is covered with a rubber material to form a drive protrusion. Rubber crawler
Wherein the tip of each corner, the size of the click row La widthwise and LW, the click row La circumferential dimension as LC, as the LW ≦ LC,
A rubber crawler comprising a constricted portion formed of a wall surface recessed in an arc cross-sectional shape toward the center of the corner in the crawler circumferential direction between the tip of each corner and the core metal body . The thickness before Kikuku Re rubber material that covers the parts, characterized in that said made larger than the thickness of the rubber material covering the tip end portion of each corner, the rubber crawler of claim 1, wherein. The rubber crawler according to claim 1 or 2, wherein a lower portion of the constricted portion of each corner portion is connected by a reinforcing rib to integrate the pair of corner portions. A flat metal core body comprises a pair of corner portions erected on the metal core body, a rubber crawler for cored used in rubber crawler as set forth in any one of claims 1 to 3,
Wherein the tip of each corner, the size of the click row La widthwise and LW, the click row La circumferential dimension as LC, as the LW ≦ LC,
A rubber crawler core comprising a constricted portion made of a wall surface recessed in an arc cross-sectional shape in the crawler circumferential direction toward the center of the corner in the crawler circumferential direction between the tip of each corner and the core metal body. Money.

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