JP5788662B2 - Elastic crawler - Google Patents

Description

  The present invention relates to an elastic crawler.

  In recent years, elastic crawlers have been widely used in traveling parts of agricultural machines, construction machines, and civil engineering machines. As this type of elastic crawler, the rubber crawler of Patent Document 1 is known.

In the rubber crawler of Patent Document 1, a core bar extending in the crawler width direction at a predetermined interval in the crawler circumferential direction is embedded in a rubber crawler body formed in an endless belt shape. On the outer peripheral surface of the rubber crawler body, lugs are provided in a staggered manner in the crawler circumferential direction with the center line of the rubber crawler body viewed from the crawler outer peripheral side. Further, the lugs are disposed at positions corresponding to the metal core, the metal core arranged in the crawler circumferential direction, and supports alternately One not a side of the crawler width direction.

JP 2007-238771 A

  By the way, in the rubber crawler of patent document 1, since the top surface which contacts the ground of a lug does not reach the center part of the crawler width direction of a core metal, when receiving the load from a wheel, the core metal is supported by the lug. It tends to tilt to the side that is not. When the core is tilted every time the wheel passes over the core during running, the vertical movement of the wheel increases and the ride comfort of the vehicle equipped with the rubber crawler deteriorates.

  An object of the present invention is to provide an elastic crawler in which the core metal is prevented from being tilted by a load from a wheel during traveling to improve riding comfort.

The elastic crawler according to claim 1 is a crawler main body formed in an endless belt shape by an elastic body, embedded in the crawler main body at intervals in the crawler circumferential direction, extends in the crawler width direction, and extends the crawler inner peripheral side. A plurality of metal cores that receive a load from a passing wheel, and a center line in the crawler width direction of the metal core that protrudes at a position corresponding to the metal core on the outer peripheral surface of the crawler body, as viewed from the crawler outer peripheral side. The crawler is arranged alternately on the left and right in the crawler circumferential direction, and the end on the crawler width direction of the top surface in contact with the ground extends along the crawler circumferential direction on the centerline or at a position beyond the centerline. A portion connecting the both ends of the top surface in the crawler circumferential direction and the end portion is a pair of inclined portions inclined in the crawler circumferential direction, and is adjacent to the crawler circumferential direction when viewed from the crawler width direction. The top is It has a plurality of lugs that continuous over La circumferential direction.

In the elastic crawler according to the first aspect, the cored bar that receives a load from the wheel is supported by the lug during traveling. Here, the elastic crawler has an end on the core metal center line side in the crawler width direction of the top surface serving as a fulcrum when the core metal loaded from the wheel is tilted to the side not supported by the lug. Since it is located on the center line of the gold or beyond the center line, for example, the core metal generated by the load from the wheel compared to the elastic crawler where the end portion of the top surface does not reach the center line of the metal core. The moment for tilting is reduced, and the tilt of the cored bar is suppressed.
As a result, even if the wheel passes over the mandrel during traveling, the inclination of the mandrel is suppressed as described above, so that the vertical movement of the wheel is reduced and riding comfort is improved.

In addition, the elastic crawler has lugs arranged alternately on the left and right in the crawler circumferential direction across the center line of the metal core as viewed from the outer periphery of the crawler, and has a top surface adjacent to the crawler circumferential direction as viewed from the crawler width direction. It is continuous in the crawler circumferential direction.
As a result, the elastic crawler has a crawler circumferential direction rigidity that is nearly uniform compared to, for example, a top surface adjacent to the crawler circumferential direction as viewed from the crawler width direction that is not continuous in the crawler circumferential direction. As a result, during traveling, the vertical movement of the roller wheel due to the rigidity step in the crawler circumferential direction when the roller wheel passes the crawler inner peripheral side of the elastic crawler is reduced, and riding comfort is further improved.
In addition, the end of the top surface of the crawler width in the crawler width direction on the core metal line side of the top surface that serves as a fulcrum when the core metal that receives the load from the wheel tilts to the side not supported by the lug is against the load from the wheel. Since stress is concentrated, the elastic body is likely to be chipped.
For this reason, in the elastic crawler according to the first aspect, the end of the top surface on the core metal center line side in the crawler width direction is extended along the crawler circumferential direction.
Thereby, the stress concentration on the end of the top surface can be relaxed, and the occurrence of the elastic chipping or the like can be suppressed.

  The elastic crawler according to claim 2 is the elastic crawler according to claim 1, wherein the end portion of the top surface is located within a range of 10% of the width of the crawler body from the center line in the crawler width direction. Yes.

In the elastic crawler according to claim 2, an end of the top surface of the lug on the side of the crawler width in the crawler width direction is located within a range of 10% of the width of the crawler main body in the crawler width direction from the core metal centerline. For example, compared with the case where the end portion of the top surface of the lug exceeds the above 10% range, the core from the wheel is reduced during running while suppressing the increase in the rigidity of the crawler body due to the lug. Gold can be prevented from tilting. When the end of the top surface of the lug exceeds 10%, the lug becomes too long in the crawler width direction, the crawler body rigidity increases, and the flexibility of the elastic crawler decreases. As a result, there is a possibility of adversely affecting the fuel consumption of the vehicle equipped with the elastic crawler. Furthermore, since the rigidity in the thickness direction of the elastic crawler when the roller is on the center of the core increases, the roller is positioned on the center of the core and between the adjacent cores (elasticity where no core is arranged). The rigidity difference when it is on the body part) increases, the vertical movement of the wheels increases, and the riding comfort of the vehicle equipped with the elastic crawler deteriorates.
Therefore, the end portion of the top surface of the lug is preferably located within a range of 10% of the width of the crawler body in the crawler width direction from the core metal center line.

  As described above, the elastic crawler of the present invention can improve the riding comfort by suppressing the cored bar from being inclined by the load from the wheel during traveling.

It is a top view which shows the outer peripheral surface of the rubber crawler of 1st Embodiment. It is a top view which shows the internal peripheral surface of the rubber crawler of 1st Embodiment. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is a top view which shows the internal peripheral surface of the elastic crawler of other embodiment. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7.

[First Embodiment]
Hereinafter, a first embodiment of the elastic crawler of the present invention will be described with reference to FIGS.
The rubber crawler 10 (an example of an elastic crawler) according to the first embodiment is a sprocket (not shown) that is an example of a driving wheel of a crawler vehicle (for example, a tractor) and an idler (not shown) that is an example of a driven wheel. It is used by being wound around.

  In the present embodiment, the circumferential direction of the rubber crawler 10 (arrow S in the figure) is described as “crawler circumferential direction”, and the width direction of the rubber crawler 10 (arrow W in the figure) is described as “crawler width direction”. . In addition, the inner peripheral side (arrow IN in the figure) of the rubber crawler 10 when the rubber crawler 10 is wound is referred to as “crawler inner peripheral side”, and the outer peripheral side of the rubber crawler 10 (arrow OUT in the figure) is “crawler” "Outer side". The crawler width direction is orthogonal to the crawler circumferential direction.

  The rubber crawler 10 has a rubber crawler main body 12 formed in an endless belt shape from a rubber material which is an example of an elastic body. As shown in FIGS. 1 and 3, a plurality of core bars 14 are embedded in the rubber crawler main body 12 at intervals in the crawler circumferential direction.

  In the present embodiment, a straight line passing through the center of the core bar 14 in the crawler width direction (center line of the core bar 14) and a straight line passing through the center of the rubber crawler body 12 in the crawler width direction (center line of the rubber crawler body 12). Match. In addition, the code | symbol CL in a figure has shown the centerline of the rubber crawler 10 (in this embodiment, it corresponds with the centerline of the rubber crawler main body 12).

  As shown in FIGS. 2 and 3, the cored bar 14 includes a central portion 16 in the crawler width direction and a pair of wing portions 18 that extend outward from both ends of the central portion 16 in the crawler width direction. And have.

  Further, the cored bar 14 has a pair of protrusions 20 protruding from the inner peripheral part of the rubber crawler body 12 to the inner peripheral side of the crawler with a sprocket (not shown), an idler (not shown), and a passing space of the wheel 102 therebetween. have. As shown in FIG. 3, the protrusion 20 is formed at a boundary portion between the central portion 16 and the wing portion 18, and a portion protruding from the inner peripheral portion of the rubber crawler body 12 is covered with a rubber material that forms the rubber crawler body 12. Has been. Hereinafter, the rubber-coated protrusion 20 is described as a rubber protrusion 34 (see FIGS. 3 and 6). The rubber crawler body 12 and the rubber protrusion 34 are integrally formed.

  In this embodiment, the sprocket (not shown), the idler (not shown), and the wheel 102 (see FIG. 3) pass between the pair of rubber projections 34 while being guided by the rubber projections 34. It has become. Note that the wheel 102 of the present embodiment is a middle roller type wheel in which a flange portion 102B is formed at the axial center of the shaft portion 102A, and the flange portion 102B is a pair of rubbers as shown in FIG. It passes between the protrusions 34.

  As shown in FIGS. 2 and 5, the cored bar 14 has a pair of wheel support portions 38 formed adjacent to the pair of projections 20 between the pair of projections 20 of the central portion 16. . The roller support portion 38 includes a first protrusion 38A that protrudes from the central portion 16 in the crawler circumferential direction, and a second protrusion 38B that protrudes from the central portion 16 in the direction opposite to the first protrusion 38A. It is configured. As shown in FIG. 2, the pair of wheel support portions 38 of the present embodiment has a rotationally symmetric shape with respect to the crawler width direction center of the cored bar 14.

  As shown in FIG. 2, the first protrusion 38A has a circumferential length longer than that of the second protrusion 38B. Further, the surfaces on the inner peripheral side of each of the first protrusions 38A and the second protrusions 38B are gently inclined toward the inner peripheral side of the crawler toward the distal end side (in the state shown in FIG. 5, upward in the drawing). It is gently sloping towards you.) Further, the inner peripheral surface of each crawler of the first protrusion 38A and the second protrusion 38B is continuous with the inner peripheral surface of the central portion 16.

  As shown in FIG. 3, the pair of wheel support portions 38 is covered with a rubber material that forms the rubber crawler body 12 at a portion protruding from the central portion 16. A part of the rubber-covered pair of wheel support portions 38 and the central portion 16 is hereinafter referred to as one or a plurality of wheel 102 provided between a sprocket (not shown) and an idler (not shown). It describes as a pair of wheel passing part 40 which passes. As the wheel 102 passes over the pair of wheel passing portions 40, a load from the wheel 102 acts on the cored bar 14. The rubber crawler main body 12 and the pair of wheel passing portions 40 are integrally formed.

  As shown in FIGS. 2 and 4, between the roller support portions 38 of the cored bar 14 adjacent to the crawler circumferential direction on the inner circumferential surface of the crawler, it extends in the crawler width direction and is connected to an engagement recess 24 described later. A groove 42 is formed. The groove 42 absorbs the tilt of the first protrusion 38A or the second protrusion 38B in the crawler circumferential direction due to the load from the wheel 102 when the wheel 102 passes over the pair of wheel passing portions 40. It is a part to do.

  As shown in FIG. 2, teeth of a sprocket (not shown) are engaged with the inner peripheral surface of the rubber crawler body 12 between the central portions 16 adjacent to each other in the crawler circumferential direction and between the pair of wheel support portions 38. An engaging recess 24 for fitting is formed. The engaging recess 24 has a bottom 24A closed with rubber (see FIGS. 4 and 5). By engaging the teeth of a sprocket (not shown) with the engaging recess 24, the driving force from the sprocket (not shown) is transmitted to the rubber crawler body 12 (rubber crawler) 10. Specifically, the sprocket tooth portion comes into contact with the wall surface of the engaging recess 24, and the wall surface is pressed by the tooth portion to transmit the driving force to the rubber crawler body 12.

As shown in FIGS. 3 and 4, endless belt-like reinforcing cord layers 28 extending in the crawler circumferential direction are embedded in the rubber crawler main body 12 on the crawler outer circumferential side of the pair of wing portions 18 of the core metal 14. Yes. The reinforcing cord layer 28 is for maintaining the tension of the rubber crawler 10 and is configured by covering one or a plurality of reinforcing cords 28A extending along the crawler circumferential direction with rubber. In the present embodiment, a steel cord having excellent tensile strength is used as the reinforcement cord 28A in order to maintain the tension of the reinforcement cord layer 28. However, the present invention is not limited to this configuration, and the tension of the reinforcement cord layer 28 is maintained. For example, a cord made of organic fiber or the like may be used as the reinforcing cord 28A as long as it has as much tensile strength as possible.
Further, the reinforcing cord layer 28 is arranged in a wider range in the crawler width direction than the core metal 14.

As shown in FIGS. 3 and 4, coating layers 46 are embedded in the rubber crawler body 12 so as to cover both ends of the pair of wing portions 18 of the core metal 14 from the inner peripheral side of the crawler. An end portion of the coating layer 46 on the inner side in the crawler width direction overlaps the reinforcing cord layer 28. That is, the tip portion of the wing portion 18 is sandwiched between the covering layer 46 and the reinforcing cord layer 28. As a result, even when various inputs are applied to the core metal 14 during traveling, the tip of the wing 18 is sandwiched between the reinforcing cord layer 28 and the covering layer 46, so that cracks from the vicinity of the tip can be prevented. Occurrence is suppressed.
Further, the coating layer 46 is configured by rubber coating one or a plurality of coating cords 46A extending along the crawler circumferential direction. As the covering cord 46A, for example, a cord made of metal fiber or organic fiber can be used.

  As shown in FIGS. 1 and 3, the outer surface of the rubber crawler body 12 has a block-like second shape that protrudes toward the outer side of the crawler on one side (left side in FIG. 1) in the crawler width direction across the center line CL. A plurality of lugs 50 are formed at intervals in the crawler circumferential direction, and a block-shaped second lug 52 that protrudes on the crawler outer circumferential side on the other side (right side in FIG. 1) in the crawler width direction across the center line CL is provided. A plurality are formed at intervals in the crawler circumferential direction.

  As shown in FIG. 1, the first lugs 50 are disposed so as to overlap every other core metal 14 arranged in the crawler circumferential direction when viewed from the crawler outer circumferential side. Further, the first lug 50 extends from the one end portion 12A (the left end portion in FIG. 1) of the rubber crawler main body 12 toward the center line CL. In the present embodiment, as shown in FIG. 1, a top surface 51 described later and at least one wing portion 18 of the cored bar 14 overlap each other.

  As shown in FIGS. 1 and 3, the top surface 51 of the first lug 50 that contacts the ground has an end portion 51E on the side of the center line CL in the crawler width direction that is outside the crawler width direction from the center line CL (here, The rubber crawler main body 12 is located within the range W1 of 10% of the crawler width CW (the width along the crawler width direction of the rubber crawler main body 12) toward the other end 12B (right end in FIG. 1). Yes.

  Moreover, the edge part 51E of the top surface 51 is extended along the crawler circumferential direction. Therefore, the load acting in the direction perpendicular to the contact surface when the projections on the road surface and the end 51E come into contact with each other is reduced, and the first lug 50 is not easily damaged. In the present embodiment, as shown in FIG. 1, the end portion 51E of the top surface 51 coincides with the center line CL. For this reason, the end 51E of the top surface 51 extends along the center line CL. Note that the length in the crawler circumferential direction of the end portion 51E of the top surface 51 is more preferably longer than the length in the crawler circumferential direction of the central portion 16 of the core metal 14.

As shown in FIG. 1, in the top surface 51 of this embodiment, both end portions 51 </ b> S in the crawler circumferential direction exceed a straight line XL that bisects the adjacent core bars 14. Further, the top surface 51, a pair of inclined portions 51K inclined in the crawler circumferential direction for connecting the end portions 51 S and the end portion 51 E is formed.

  Moreover, the 1st lug 50 has the side wall which comprises an outer periphery inclined so that it may spread toward the root part from the top surface 51. FIG. With this configuration, as shown in FIG. 3, in the present embodiment, the base portion of the first lug 50 is located on the other end 12B side with respect to the end 51E.

On the other hand, as shown in FIG. 1, the second lugs 52 are shifted in the crawler circumferential direction with respect to the first lugs 50 when viewed from the crawler outer peripheral side, and are alternately arranged on the core bars 14 arranged in the crawler circumferential direction. They are arranged so as to overlap. Further, the second lug 52 extends from the other end portion 12B of the rubber crawler body 12 to the center line CL side. In the present embodiment, as shown in FIG. 1, a top surface 53 to be described later overlaps at least the other wing portion 18 of the cored bar 14.
With this configuration, when viewed from the crawler outer peripheral side, as shown in FIG. 1, the first lugs 50 and the second lugs 52 are alternately arranged on the left and right sides in the crawler circumferential direction with the center line CL interposed therebetween.

  As shown in FIGS. 1 and 3, the top surface 53 of the second lug 52 that contacts the ground has an end portion 53E on the side of the center line CL in the crawler width direction that is outside the crawler width direction (here, the center line CL). The rubber crawler main body 12 is positioned in the range W2 of 10% of the crawler width CW toward the one end 12A (the left end in FIG. 1).

  Further, the end portion 53E of the top surface 53 extends along the crawler circumferential direction. Therefore, the load acting in the direction perpendicular to the contact surface when the projections on the road surface and the end 53E come into contact with each other is reduced, and the second lug 52 is hardly damaged. In the present embodiment, as shown in FIG. 1, the end 53E of the top surface 53 coincides with the center line CL. For this reason, the end 53E of the top surface 53 extends along the center line CL. The length in the crawler circumferential direction of the end portion 53E of the top surface 53 is more preferably longer than the length in the crawler circumferential direction of the central portion 16 of the core metal 14.

As shown in FIG. 1, in the top surface 53 of the present embodiment, both end portions 53 </ b> S in the crawler circumferential direction exceed a straight line XL that bisects the adjacent core bars 14. Further, the top surface 53, a pair of inclined portions 53K inclined in the crawler circumferential direction for connecting the end portions 53 S and the end portion 53 E is formed.

  Moreover, the side wall which comprises outer periphery inclines so that the 2nd lug 52 may spread toward the root part from the top surface 53, and it inclines. With this configuration, as shown in FIG. 3, in the present embodiment, the base portion of the second lug 52 is located closer to the one end 12 </ b> A than the end 53 </ b> E.

Next, the effect of the rubber crawler 10 of this embodiment is demonstrated.
In the rubber crawler 10, the core metal 14 that receives a load from the wheel 102 is supported by the first lug 50 or the second lug 52 during traveling.

More specifically, as shown in FIG. 3, the wheel 102 is formed on the pair of wheel support portions 38 (on the pair of wheel passage passage portions 40) of the core metal 14 supported on the one side only by the second lug 52. Is passed, the load from the wheel 102 acts on the central portion of the cored bar 14 (including the pair of wheel passing portions 40). By this load, a moment that tilts the cored bar 14 to an unsupported side with the end 53E of the top surface 53 as a fulcrum occurs.
Here, in the rubber crawler 10, since the end portion 53E of the top surface 53 is positioned within the range W2 (on the center line CL in this embodiment), for example, the end portion 53E of the top surface 53 is the center line. Compared to a rubber crawler that does not reach CL, the moment for tilting the core metal 14 caused by the load from the wheel 102 is reduced, and the tilt of the core metal 14 is suppressed.
Further, a wheel is supported on the pair of wheel support portions 38 of the core bar 14 supported on the first lug 50 only on one side (the core bar adjacent to the core bar 14 supported on the second lug 52 only on one side). Even when 102 passes, the moment of tilting the cored bar 14 caused by the load from the rolling wheel 102 is reduced in the same manner as the cored bar 14 supported only by the second lug 52 on one side. Tilt is suppressed.
Thereby, even when the wheel 102 passes over the pair of wheel support portions 38 during traveling, the vertical movement of the wheel 102 is reduced because the inclination of the cored bar 14 is suppressed as described above. Ride comfort is improved.

On the other hand, as shown in FIG. 3, when the wheel 102 passes over the pair of wheel support portions 38 of the core metal 14 supported only on one side by the second lug 52, it is supported by the second lug 52 of the core metal 14. Since the wheel passing portion 40 on the side that is being used has a greater reaction force against the load of the wheel 102 than the wheel passing portion 40 on the side that is not supported, friction with the flange portion 102B of the wheel 102 is caused. Wear progress is accelerated. Thereby, a wear difference is generated in the pair of wheel passing portions 40. Further, the flange portion 102B of the wheel 102 is quickly worn away on the side receiving a large reaction force from the wheel passing portion 40, and a wear difference (uneven wear) occurs in the axial direction.
Here, in the rubber crawler 10, since the end portion 53E of the top surface 53 is positioned within the range W2 (in the present embodiment, on the center line CL), the reaction force against the load from the rolling wheels 102 is the crawler width. It becomes nearly uniform in direction.
Further, the wheel 102 is moved on the pair of wheel passing portions 40 of the core metal 14 supported only by the first lug 50 on one side (the core metal adjacent to the core metal 14 supported only by the second lug 52 on one side). In the same manner as the cored bar 14 supported only by the second lug on one side, the end 51E of the top surface 51 is positioned within the range W1 (on the center line CL in this embodiment) even when Therefore, the reaction force against the load from the wheel 102 becomes nearly uniform in the crawler width direction.
For this reason, a pair of wheel passing part 40 wears substantially uniformly, and collar part 102B of wheel 102 also wears substantially uniformly.
Thereby, it can suppress that partial wear arises in the axial direction of a pair of wheel passing part 40 of the rubber crawler 10, and the collar part 102B.

  Further, in the rubber crawler 10, the first lugs 50 and the second lugs 52 are alternately arranged on the left and right in the crawler circumferential direction across the center line CL when viewed from the crawler outer peripheral side, and further, the crawler circumferential direction viewed from the crawler width direction Are adjacent to each other in the crawler circumferential direction. Thereby, for example, the crawler circumferential direction rigidity of the rubber crawler 10 is nearly uniform as compared with a case where the top surfaces 51 and 53 adjacent to the crawler circumferential direction are not continuous in the crawler circumferential direction when viewed from the crawler width direction. Become. As a result, during traveling, the vertical movement of the wheel 102 due to the rigidity step in the crawler circumferential direction when the wheel 102 passes over the pair of wheel passing portions 40 is reduced, and riding comfort is further improved.

Since the end portion 51E of the top surface 51 of the first lug 50 is located within the range W1, for example, the rubber formed by the first lug 50 compared to the case where the end portion 51E of the top surface 51 exceeds the range W1. While suppressing an increase in the rigidity of the crawler main body 12, it is possible to suppress the metal core 14 from being tilted by a load from the wheel 102 during traveling. When the end portion 51E of the top surface 51 of the first lug 50 exceeds the range W1, the first lug 50 becomes too long in the crawler width direction and the rigidity of the rubber crawler body 12 is increased, and the rubber crawler 10 flexibility is reduced. As a result, there is a possibility of adversely affecting the fuel consumption of the vehicle equipped with the rubber crawler 10.
On the other hand, since the end 53E of the top surface 53 of the second lug 52 is located within the range W2, the second lug 52 is compared with, for example, the end 53E of the top surface 53 exceeding the range W2. It is possible to suppress the core bar 14 from being inclined by the load from the wheel 102 during traveling while suppressing the increase in the rigidity of the rubber crawler body 12 due to the above. If the end 53E of the top surface 53 of the second lug 52 exceeds the range W2, the second lug 52 becomes too long in the crawler width direction, and the rigidity of the rubber crawler body 12 is increased, and the rubber crawler 10 flexibility is reduced. As a result, there is a possibility of adversely affecting the fuel consumption of the vehicle equipped with the rubber crawler 10.
Furthermore, since the rigidity in the thickness direction of the rubber crawler 10 when the roller 102 is on the center of the core metal 14 is increased, the roller 102 is positioned on the center of the core metal 14 and between the adjacent core metals 14 (cores). The difference in rigidity when the metal 14 is on the rubber part (where the gold 14 is not disposed) is increased, the vertical movement of the wheels is increased, and the riding comfort of the vehicle equipped with the rubber crawler 10 is deteriorated.
Accordingly, the end portion 51E of the top surface 51 is preferably positioned within the range W1, and the end portion 53E of the top surface 53 is preferably positioned within the range W2.

As shown in FIG. 3, stress with respect to the load from the roller 102 is concentrated on the end portion 51 </ b> E of the top surface 51 that is a fulcrum of moment when the core 14 that receives the load from the roller 102 tilts. For this reason, rubber chipping or the like is likely to occur at the end portion 51E of the top surface 51.
Similarly, the end portion 53E of the top surface 53 is liable to cause rubber chipping due to stress concentration with respect to the load from the wheel 102.
Here, in the rubber crawler 10, the end portions 51E and 53E of the top surfaces 51 and 53 are extended along the crawler circumferential direction. Accordingly, to alleviate the stress concentration to the end 51E, 53 E of the top surface 51 and 53 (specifically, each end 51E, dispersing the stress on 53E in the crawler circumferential direction) that can, rubber chipping Etc. can be suppressed.

Further, as shown in FIG. 1, both end 51S of the top surface 51 of the first lug 50 is to exert edge effect, it is possible to improve the traction and braking force. Then, by connecting the end portion 51E and the both end portions 51S of the top surface 51 with the inclined portion 51K, corners are not formed, such as rubber chipping of the corner portion is prevented. Note that the second lug 52, by the same manner as the first lug 50, both end portions 53S of the top surface 53 to improve the traction and braking force at the edge effect, to form an inclined portion 53K of the top surface 53, a corner The part is not formed, and the rubber chipping at the corner is prevented. With these configurations, the load acting in the direction perpendicular to the contact surface when the projections and the like on the road surface come into contact with the end portions 51E and 53E is reduced, and the first lug 50 and the second lug 52 are less likely to be damaged.

[Other Embodiments]
The rubber crawler 10 according to the first embodiment is a type of rubber crawler in which a roller 102 passes over a pair of wheel passing portions 40 formed between a pair of rubber protrusions 34. However, the present invention is not limited to this configuration, and a roller passage passing portion 64 formed on the outer side in the crawler width direction of the pair of rubber projecting portions 34 as shown in FIGS. A rubber crawler of a type through which both-wheel type roller wheels 104 each having a flange 104B formed at both end portions in the axial direction thereof may be used. As shown in FIG. 7, the core metal 14 constituting the rubber crawler 60 is not formed with the pair of wheel support portions 38 of the first embodiment, and the interval between the pair of protrusions 20 is narrowed instead. Also, the rubber crawler body 62 constituting the rubber crawler 60 is not formed with the groove portion 42 of the first embodiment, but instead has a thick roller wheel that rises from the periphery to the outside in the crawler width direction of the pair of rubber projections 34. A passage part 64 is formed. In addition, the other structure of the rubber crawler 60 is the same as that of the rubber crawler 10 of 1st Embodiment. For this reason, in the rubber crawler 60, there can exist an effect similar to the rubber crawler 10 of 1st Embodiment.

  In the above-described embodiment, the center line of the cored bar 14 and the center line of the rubber crawler main bodies 12 and 62 are made to coincide with each other. However, the present invention is not limited to this configuration, and the center line of the rubber crawler main bodies 12 and 62 is aligned. On the other hand, the center line of the cored bar 14 may be shifted in the crawler width direction. In this case, the positions of the end portions 51E and 53E of the top surfaces 51 and 53 are determined based on the center line of the cored bar 14.

  In the above-described embodiment, the rubber crawlers 10 and 60 are rubber crawlers configured to retain tension by the reinforcing cord layer 28. However, the present invention is not limited to this configuration, and the reinforcing cord layer 28 is not used. The so-called link-type elastic crawler may be used in which adjacent core bars 14 are connected by a connecting member, or connecting portions formed on the core bars are connected to each other, and the tension of the rubber crawler is held by the connected core bars. .

  Furthermore, in the embodiment described above, the rubber crawler body 12 is formed of rubber as an example of an elastic body. However, the present invention is not limited to this configuration, and the rubber crawler body 12 is formed of an elastomer other than rubber. May be.

  Furthermore, although the metal core 14 of the above-described embodiment is made of metal, the present invention is not limited to this configuration, and the metal core 14 may be made of resin as long as it has sufficient rigidity.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

10 Rubber crawler (elastic crawler)
12 Rubber crawler body (elastic crawler body)
12A One end (one end of elastic crawler)
12B The other end (the other end of the elastic crawler)
14 Core 50 50 First lug (rug)
51 Top surface 51E End (end on the center line side)
51K slope
51S both ends (both ends in the crawler circumferential direction)
52 Second lug
53 Top surface 53 E end (end on the center line side)
53K slope
53S both ends (both ends in the crawler circumferential direction)
60 Rubber crawler (elastic crawler)
62 Rubber crawler body (elastic crawler body)
102 Rolling wheel 104 Rolling wheel CL Center line W1, W2 Range (10% of the width of the crawler body from the center line)
CW Crawler width S Crawler circumferential direction W Crawler width direction IN Crawler inner circumference OUT Crawler outer circumference

Claims (2)

A crawler body formed in an endless belt shape by an elastic body;
A plurality of metal cores embedded in the crawler body at intervals in the crawler circumferential direction, extending in the crawler width direction, and receiving a load from a roller wheel passing through the crawler inner circumferential side;
Projected at a position corresponding to the cored bar on the outer peripheral surface of the crawler body, and arranged alternately on the left and right in the crawler circumferential direction across the centerline in the crawler width direction of the cored bar as viewed from the crawler outer peripheral side, The crawler width direction end portion of the top surface in contact with the crawler width direction extends along the crawler circumferential direction on the central line or at a position beyond the central line , and both the crawler circumferential direction end portions of the top surface and the crawler width direction A plurality of lugs in which the top surface adjacent to the crawler circumferential direction as viewed from the crawler width direction is continuous with the crawler circumferential direction;
Elastic crawler with.   2. The elastic crawler according to claim 1, wherein the end portion of the top surface is located within a range of 10% of the width of the crawler main body in the crawler width direction from the center line.

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