JP5784322B2 - Elastic crawler - Google Patents

Description

  The present invention relates to an elastic crawler.

Conventionally, a rubber crawler has been widely used in a traveling portion of an agricultural machine. As this type of rubber crawler for agricultural machinery, the one described in Patent Document 1 is known.
In the rubber crawler of Patent Document 1, long lugs and short lugs extending linearly along the width direction are alternately arranged in the circumferential direction on the outer circumferential surface of the endless rubber elastic body. Moreover, in the said rubber crawler, in order to suppress the mud clogging between a long lag and a short lag at the time of rough terrain (for example, a wet field etc.), the height of the width direction center part of a long lag is made low. .

Japanese Patent Laid-Open No. 11-20551

As described above, the rubber crawler of Patent Document 1 suppresses mud clogging between the long lag and the short lag when traveling on rough terrain such as a wet field by reducing the height of the central portion in the width direction of the long lag. doing.
However, in the market, development of a rubber crawler in which mud clogging is further suppressed as compared with the rubber crawler of Patent Document 1, that is, soil removal properties are improved is expected.

  An object of this invention is to provide the elastic crawler which improved the soil removal property at the time of rough terrain travel, such as a wet field.

The invention according to claim 1 is a crawler body that is formed in an endless belt shape by an elastic body, a plurality of core bars are embedded in the crawler circumferential direction at intervals, and wound around a drive wheel and a driven wheel, and the crawler body Projecting on the outer periphery of the crawler, arranged on both sides of the center line of the core metal in the crawler width direction as viewed from the outer periphery of the crawler, and disposed in plural in the crawler circumferential direction, and adjacent to each other in the crawler width direction A lug in which the ends on the center line side of each other are shifted in the crawler circumferential direction, and the crawler main body protrudes from the crawler outer circumferential side and extends incline in the crawler circumferential direction when viewed from the crawler outer circumferential side. It is an elastic crawler which has the connection rib which connects the edge part by the side of the said centerline of the said lugs mutually adjacent | abutted in the width direction and whose height is lower than the said lug .

  In the elastic crawler according to the first aspect, the crawler main body is bent along the outer periphery of the driving wheel or the driven wheel at a portion wound around the driving wheel and the driven wheel (hereinafter referred to as “winding portion” as appropriate). . When the crawler body is curved in this manner, the gap between the lugs adjacent to each other in the crawler circumferential direction and the gap between the connecting ribs adjacent to each other in the crawler circumferential direction are increased. As a result, even when mud enters between the lags adjacent to each other in the crawler circumferential direction and between the connecting ribs adjacent in the crawler circumferential direction when traveling on rough terrain such as a wet field, the mud entrapped part reaches the winding part, and the lag And the interval between the connecting ribs are widened, and the mud is separated from the lugs and between the connecting ribs.

  Further, in the above-described elastic crawler, the center line side end portions (end portions on the center line side in the crawler width direction of the core metal) of each of the two lugs connected by the connecting rib are in a position shifted in the crawler circumferential direction. For this reason, in the winding portion, a force that relatively separates along the bending direction (the direction along the outer periphery of the drive wheel or the driven wheel) acts on each center line side end, and each center line side The connecting rib that connects the ends is twisted. Here, since the connecting rib is inclined with respect to the crawler circumferential direction, for example, it is easier to be twisted than that along the crawler circumferential direction. As described above, since the connecting ribs are twisted at the winding portion, even when traveling on rough terrain such as a wet paddy field, mud adhered to and around the connecting ribs adjacent to each other in the crawler circumferential direction is effectively peeled off. Is done.

  From the above, according to the elastic crawler of claim 1, when traveling on rough terrain such as a wet field, the mud adhered to the crawler circumferential direction between the adjacent lugs and between the connecting ribs adjacent to each other in the crawler circumferential direction is separated. Promoted. That is, the soil removal property is improved. This improves the propulsive force when traveling on rough terrain such as wet fields.

Moreover , since the height of the connecting rib is lower than the lug, the amount of mud adhering between the connecting ribs adjacent to each other in the crawler circumferential direction can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the two lugs connected by the connecting ribs, as viewed from the crawler outer peripheral side, each crawler circumferential direction one end of the top surface along the crawler width direction. It is an elastic crawler which exists on the 1st straight line and the crawler circumferential direction other end part of each top surface exists on the 2nd straight line along a crawler width direction.

In the elastic crawler according to claim 2, the two lugs connected by the connecting rib are located on a first straight line along the crawler width direction at one end portion in the crawler circumferential direction of each crest when viewed from the crawler outer peripheral side. Since the other end of the top surface of the crawler in the crawler circumferential direction is on a second straight line along the crawler width direction, the crawler circumferential direction of the top surface of each of the two lugs when traveling on leveling (for example, a paved road) Since one end is grounded (depressed) at the same time and the other ends are simultaneously separated (kicked out) from the ground surface, vibration during running is reduced.

The invention according to claim 3 is the elastic crawler according to claim 1 or 2 , wherein at least a portion of the lug on the side of the connecting rib is inclined in a direction opposite to an inclination direction of the connecting rib. It is.

In the elastic crawler according to claim 3 , since at least the portion of the lug on the side of the connecting rib is inclined in the opposite direction with respect to the direction of inclination of the connecting rib, the lug and the connecting rib adjacent to each other in the crawler circumferential direction are provided. The formed space (hereinafter referred to as “groove”) has a plurality of bent portions (hereinafter referred to as “bent portions”) extending in the crawler width direction and in the crawler circumferential direction.
For this reason, when traveling on rough terrain such as an inclined farm field, the soil block that has entered the groove and has been solidified comes into contact with the bent portion of the groove, and the side slip of the elastic crawler is suppressed by the shear stress of the soil block.

  As described above, according to the elastic crawler of the present invention, it is possible to improve the soil removal performance when traveling on rough terrain such as a wet field.

1 is a perspective view including a partial cross section of an elastic crawler according to a first embodiment of the present invention. It is a top view which shows the internal peripheral surface of the elastic crawler which concerns on 1st Embodiment. It is a top view which shows the outer peripheral surface of the elastic crawler which concerns on 1st Embodiment. It is a side view which shows a part of side surface of the elastic crawler which concerns on 1st Embodiment. It is the X1-X1 sectional view taken on the line of FIG. It is the X2-X2 sectional view taken on the line of FIG. FIG. 6 is a sectional view taken along line Y1-Y1 of FIG. It is a perspective view containing the partial cross section of the elastic crawler concerning 2nd Embodiment. It is a top view which shows the outer peripheral surface of the elastic crawler which concerns on 2nd Embodiment. FIG. 10 is a cross-sectional view taken along line X3-X3 in FIG. 9. FIG. 10 is a sectional view taken along line X4-X4 of FIG.

[First Embodiment]
Hereinafter, the elastic crawler according to the first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, an endless rubber crawler 10 as an example of an elastic crawler according to the first embodiment is an example of a sprocket 100 that is an example of a driving wheel of a crawler vehicle (for example, a tractor) and an example of a driven wheel. It is used by being wound around an idler (not shown).

  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.

  As shown in FIG. 1, the rubber crawler 10 has a crawler main body 12 (an example of a crawler main body) formed in an endless belt shape by a rubber material that is an example of an elastic body.

As shown in FIGS. 1 and 2, a plurality of core bars 20 are embedded in the crawler main body 12 at intervals in the crawler circumferential direction (a constant interval in this embodiment). As shown in FIG. 5 and FIG. 6, the core metal 20 includes a central portion 26 in the crawler width direction, a pair of protrusions 24 projecting to the crawler inner peripheral side on both sides of the crawler width direction across the central portion 26, and And a pair of wings 28 extending in the crawler width direction from both ends of the central portion 26 in the crawler width direction.
Note that the protrusion 24 of the present embodiment protrudes from the root portion of the wing portion 28 toward the crawler inner peripheral side.

  As shown in FIGS. 5 and 6, the crawler main body 12 is provided with a protrusion 24 protruding from an inner peripheral surface (in this embodiment, a plane passing through a wheel passing surface 36 described later), and a rubber constituting the crawler main body 12. A plurality of rubber protrusions 14 covered with a material are formed. The rubber protrusion 14 is formed with a passage space between the sprocket 100 and an idler (not shown).

  As shown in FIGS. 2 and 7, the crawler main body 12 includes a rolling surface 30 on which a sprocket 100 and an idler (not shown) roll between the central portions 26 of the core bars 20 adjacent to each other in the crawler circumferential direction. Is formed.

  As shown in FIGS. 2 and 5, the crawler body 12 is formed with an engagement recess 32 in which the tooth portion 100 </ b> B of the sprocket 100 is inserted and engaged between the rubber protrusions 14 adjacent to each other in the crawler circumferential direction. . A pair of the engaging recesses 32 are formed in the crawler width direction.

  Here, the sprocket 100 and idler (not shown) around which the rubber crawler 10 of this embodiment is wound will be described. As shown in FIGS. 1 and 5, the sprocket 100 includes a disc-shaped main body portion 100A and a pair of tooth portions 100B that extend radially outward from both axial ends of the outer peripheral portion of the main body portion 100A. Has been. Note that the pair of tooth portions 100B are formed on the outer periphery of the main body portion 100A at regular intervals in the circumferential direction. On the other hand, the idler has a disk shape.

  As shown in FIGS. 2, 4, and 6, the crawler main body 12 includes one or more rolling wheels provided between the sprocket 100 and an idler (not shown) outside the engagement recess 32 in the crawler width direction. A flat wheel passing surface 36 on which the roller 104 rolls is formed continuously in the crawler circumferential direction. In addition, the wheel 104 of this embodiment is comprised by a pair of disc member 104A. The disk member 104A has its outer peripheral end folded back outward, and the radially outer surface (the outer circumferential surface of the disk member 104A) of the folded portion is in contact with the wheel passing surface 36. The pair of disk members 104 </ b> A straddles the pair of rubber protrusions 14.

  In this embodiment, as shown in FIGS. 5 and 6, the sprocket 100 and the idler (not shown) pass between the pair of rubber projections 14 while being guided by the rubber projections 14 and on the rolling surface 30. The wheel 104 is configured to roll on the wheel passing surface 36 while being guided by the pair of rubber projections 14.

  In the present embodiment, as shown in FIGS. 2 and 5, the center of the core bar 20 in the crawler width direction and the center of the crawler body 12 in the crawler width direction coincide with each other. In addition, the code | symbol CL in a figure has shown the center line (The center line of the crawler width direction of the metal core 20 in this embodiment) of the rubber crawler 10. FIG. Moreover, the crawler width direction inner side in this embodiment means the center line CL side, and the crawler width direction outer side means the side spaced apart from the center line CL side.

  As shown in FIGS. 1 and 3, the crawler main body 12 is formed with a block-like long lug 39, a short lug 40, a long lug 41, and a short lug 42 that protrude toward the outer periphery of the crawler.

  As shown in FIG. 3, long lugs 39 and short lugs 40 are alternately arranged in the crawler circumferential direction on one side (left side in FIG. 3) in the crawler width direction across the center line CL. Further, the long lug 39 and the short lug 40 are disposed between the core bars 20 adjacent to each other in the crawler circumferential direction.

The long lug 39 is formed as an inclined portion 39A extending incline in the crawler circumferential direction in the crawler width direction, and a linear portion 39B extending linearly in the crawler width direction on the outer side in the crawler width direction. Further, the outer end 39E of the long lug 39 in the crawler width direction reaches the vicinity of the end 12E of the crawler body 12 in the crawler width direction.
On the other hand, the short lug 40 has a shorter overall length than the long lug 39, and extends inclining in the same direction as the inclined portion 39 </ b> A of the long lug 39. In addition, the outer end 40E on the outer side in the crawler width direction of the short lug 40 is located on the inner side in the crawler width direction with respect to the outer end part 39E of the long lug 39.

Further, as shown in FIG. 3, long lugs 41 and short lugs 42 are alternately arranged in the crawler circumferential direction on the other side in the crawler width direction (right side in FIG. 3) across the center line CL. The long lug 41 and the short lug 42 are disposed between the core bars 20 adjacent to each other in the crawler circumferential direction. The long lug 41 is disposed so as to be adjacent to the short lug 40 in the crawler width direction. The lug 42 is disposed so as to be adjacent to the long lug 39 in the crawler width direction.

The long lug 41 is formed as an inclined portion 41A extending incline in the crawler circumferential direction in the crawler width direction, and a straight portion 41B extending linearly in the crawler width direction on the outer side in the crawler width direction. Further, the outer end 41E of the long lug 41 in the crawler width direction reaches the vicinity of the end 12E of the crawler body 12 in the crawler width direction.
On the other hand, the short lug 42 has a shorter overall length than the long lug 41 and extends inclined in the same direction as the inclined portion 41 </ b> A of the long lug 41. In addition, the outer end 42 </ b> E on the outer side in the crawler width direction of the short lug 42 is located on the inner side in the crawler width direction with respect to the outer end part 41 </ b> E of the long lug 41.

  In the present embodiment, the inclined portion 39A of the long lug 39, the inclined portion 41A of the long lug 41, the short lug 40, and the short lug 42 are inclined in the same direction. In an embodiment different from the present embodiment, the inclination directions of the inclined portion 39A of the long lug 39, the inclined portion 41A of the long lug 41, the short lug 40, and the short lug 42 may be different.

  As shown in FIG. 3, the inner end 39 </ b> C (end on the center line CL side) of the long lug 39 on the crawler width direction and the inner end 42 </ b> C (end on the center line CL side) of the short lug 42 on the crawler width direction. The inner end 40C (the end on the center line CL side) of the short lug 40 and the inner end of the long lug 41 on the inner side of the crawler in the crawler width direction. The portion 41C (end on the center line CL side) is at a position shifted in the crawler circumferential direction.

The long lug 39 and the short lug 42 adjacent to each other in the crawler width direction are connected to each other by a connecting rib 44 in which the inner end portion 39C and the inner end portion 42C extend while being inclined with respect to the crawler circumferential direction. The connecting rib 44 is formed on the crawler main body 12 so as to protrude to the outer peripheral side of the crawler.
On the other hand, the long lug 41 and the short lug 40 that are adjacent to each other in the crawler width direction are connected by a connecting rib 45 in which the inner end portion 41C and the inner end portion 40C extend while being inclined with respect to the crawler circumferential direction. The connecting rib 45 is formed on the crawler main body 12 so as to protrude toward the outer periphery of the crawler.
In the present embodiment, both the connecting ribs 44 and 45 are inclined in the same direction with respect to the crawler circumferential direction. Further, the inclination direction of the connecting ribs 44 and 45 is opposite to the inclination direction of the short lugs 40 and 42.

  As shown in FIG. 6, the height H1 of the connecting rib 44 is the long lug 39 (in this embodiment, the lengths of the long lugs 39 and 41 and the short lugs 40 and 42 are the same. In the figure, it is set lower than the symbol H0). Specifically, the height H1 of the connecting rib 44 is set within a range of 20 to 75% of the height H0. When the height H1 of the connecting rib 44 is less than 20% of the height H0, the effect of improving the rigidity of the long lugs 39 and the short lugs 42 in the crawler circumferential direction and the crawler width direction is small, and the height H1 is When it exceeds 75% of the height H0, the amount of mud that enters between the connecting ribs 44 and 45 adjacent in the crawler circumferential direction increases. Therefore, it is preferable to set the height H1 of the connecting rib 44 within a range of 20 to 75% of the height H0. Moreover, a more preferable result can be obtained by setting the height H1 of the connecting rib 44 within a range of 25 to 50% of the height H0.

  Similarly to the above, as shown in FIG. 5, the height H <b> 2 of the connecting rib 45 is set lower than the height H <b> 0 of the long lug 41. Specifically, the height H2 of the connecting rib 45 is set within a range of 20 to 70% of the height H0 of the long lug 41. When the height H2 of the connecting rib 45 is less than 20% of the height H0, the effect of improving the rigidity of the long lugs 41 and the short lugs 40 in the crawler circumferential direction and the crawler width direction is small, and the height H2 is When it exceeds 75% of the height H0, the amount of mud that enters between the connecting ribs 44 and 45 adjacent in the crawler circumferential direction increases. Therefore, the height H2 of the connecting rib 45 is preferably set within a range of 20 to 75% of the height H0. A more preferable result can be obtained by setting the height H2 of the connecting rib 45 within a range of 25 to 50% of the height H0.

  As shown in FIG. 3, the long lug 39 and the short lug 42 connected by the connecting rib 44 extend along the crawler width direction at one end portion in the crawler circumferential direction of the top surface 39S and one end portion in the crawler circumferential direction of the top surface 42S. Located on the first straight line SL1, the other end in the crawler circumferential direction of the top surface 39S and the other end in the crawler circumferential direction of the top surface 42S are located on the second straight line SL2 extending along the crawler width direction.

  The long lug 41 and the short lug 40 connected by the connecting rib 45 are positioned on the first straight line SL3 in which the crawler circumferential end of the top surface 41S and the crawler circumferential one end of the top surface 40S extend along the crawler width direction. The other end portion of the top surface 41S in the crawler circumferential direction and the other end portion of the top surface 40S in the crawler circumferential direction are located on the fourth straight line SL2 extending along the crawler width direction.

As shown in FIG. 3, at least the portion of the long lug 39 on the connection rib 44 side (inclined portion 39 </ b> A) is inclined in the opposite direction to the inclination direction of the connection rib 44, and all of the short lugs 42 are inclined of the connection rib 44. Inclined in the opposite direction to the direction. Further, at least a portion of the long lug 41 on the side of the connecting rib 45 (inclined portion 41 </ b> A) is inclined in the opposite direction with respect to the inclination direction of the connecting rib 45, and the entire short lug 40 is opposite to the inclination direction of the connecting rib 45. Inclined in the direction.
With the above configuration, the space portion (hereinafter referred to as “groove portion 46”) formed between the long lug 39 and the short lug 42 connected by the connecting rib 44 and the long lug 41 and the short lug 40 connected by the connecting rib 45. ”) Has a plurality of bent portions in the crawler circumferential direction (hereinafter referred to as“ bent portions ”) while extending in the crawler width direction. In addition, as shown in FIG. 3, the groove part 46 of this embodiment has a zigzag part that bends alternately to one side and the other side in the crawler circumferential direction.

  As shown in FIG. 5, an endless belt-like reinforcing layer 48 extending in the crawler circumferential direction is embedded in the crawler main body 12 on the crawler outer circumferential side of the core metal 20. This reinforcing layer 48 is for maintaining the tension of the rubber crawler 10, and is a single reinforcing cord wound spirally along the crawler circumferential direction or a plurality of cords arranged in parallel along the crawler circumferential direction. These reinforcing cords are formed by rubber coating. In the present embodiment, a steel cord having excellent tensile strength is used as the reinforcement cord for maintaining the tension of the reinforcing layer 48. However, the present invention is not limited to this configuration, and the tension of the reinforcing layer 48 can be maintained. For example, a cord made of organic fiber or the like may be used as the reinforcing cord as long as it has a tensile strength of 5.

Next, the operation of the rubber crawler 10 of this embodiment will be described.
As shown in FIG. 1, in the rubber crawler 10, the sprocket 100 rotates in a state where the tooth portion 100 </ b> B of the sprocket 100 is inserted and engaged with the engagement recess 32 of the crawler main body 12, thereby forming the concave wall surface of the engagement recess 32. Is pressed by the tooth portion 100B and the driving force is transmitted.
In the rubber crawler 10, when traveling on leveling (for example, paved road), the long lugs 39 and 41 and the short lugs 40 and 42 (hereinafter, the long lugs 39 and 41 and the short lugs 40 and 42 are appropriately connected to the lugs 39. (Described as ˜41) supports the weight of the crawler wheel, and traction force is exerted by friction between the top surfaces 39S to 42S of the lugs 39 to 42 and the ground contact surface (road surface).
On the other hand, when traveling on rough terrain (for example, wet fields, etc.), the lugs 39 to 42 support the weight of the crawler vehicle, and the shear stress of the mud where the lugs 39 to 42 have digged into the mud is used. Traction is demonstrated.

Further, in the rubber crawler 10, the crawler main body 12 is curved along the outer periphery of the sprocket 100 or idler (not shown) at a portion wound around the sprocket 100 and idler (not shown). When the crawler main body 12 is thus curved, the distance between the long lugs 39 and the short lugs 40 adjacent in the crawler circumferential direction, the distance between the long lugs 41 and the short lugs 42 adjacent in the crawler circumferential direction, and the connection adjacent in the crawler circumferential direction. The distance between the rib 44 and the connecting rib 45 is increased (that is, the width of the groove 46 is increased).
Accordingly, when traveling on rough terrain such as a wet field, it is adjacent between the long lug 39 and the short lug 40 adjacent in the crawler circumferential direction, between the long lug 41 and the short lug 42 adjacent in the crawler circumferential direction, and adjacent in the crawler circumferential direction. Even if mud enters between the connecting rib 44 and the connecting rib 45, the portion in which the mud enters reaches the winding portion, and the interval between the long lug 39 and the short lug 40, the long lug 41 and the short lug 42 Since the interval and the interval between the connecting rib 44 and the connecting rib 45 become wide, the long lug 39 and the short lug 40, the long lug 41 and the short lug 42, and the connecting rib 44 and the connecting rib are connected. The mud is separated from the space 45 (that is, the mud is separated from the groove 46).

  In the rubber crawler 10, the inner end portions 39 </ b> C and 42 </ b> C of each of the long lug 39 and the short lug 42 connected by the connecting rib 44 are at positions shifted in the crawler circumferential direction. For this reason, in the winding portion, a force that relatively separates along the bending direction (the direction along the outer periphery of the sprocket 100 or idler (not shown)) acts on each of the inner end portions 39C and 42C, The connecting ribs 44 that connect the inner end portions 39C and 42C are twisted. Here, since the connecting rib 44 is inclined with respect to the crawler circumferential direction, for example, it is more easily twisted than that along the crawler circumferential direction.

  Further, similarly to the above, the inner end portions 41C and 40C of the long lug 41 and the short lug 40 connected by the connecting rib 45 are in positions shifted in the crawler circumferential direction. For this reason, in the winding portion, a force that relatively separates along the bending direction (the direction along the outer periphery of the sprocket 100 or idler (not shown)) acts on the inner end portions 41C and 40C, The connecting ribs 45 that connect the inner end portions 41C and 40C are twisted. Here, since the connecting rib 45 is inclined with respect to the crawler circumferential direction, for example, it is more easily twisted than that along the crawler circumferential direction.

  As described above, since the connecting rib 44 and the connecting rib 45 are twisted in the winding portion, even when the vehicle travels on rough terrain such as a wet paddy, it is between the connecting rib 44 and the connecting rib 45 adjacent to each other in the crawler circumferential direction. , And the mud adhering to the surrounding area is effectively peeled off.

  From the above, according to the rubber crawler 10, when traveling on rough terrain such as a wet paddy field, between the long lug 39 and the short lug 40 adjacent to each other in the crawler circumferential direction, the long lug 41 and the short lug 42 adjacent to each other in the crawler circumferential direction. , And between the connecting ribs 44 adjacent to each other in the crawler circumferential direction and the connecting ribs 45 are promoted. That is, the soil removal property of the rubber crawler 10 is improved. As a result, the propulsive force of the crawler vehicle when traveling on rough terrain such as a wetland is improved.

  Further, in the rubber crawler 10, since the height H1 of the connecting rib 44 and the height H2 of the connecting rib 45 are lower than the height H0 of each lug 39 to 42, the connecting rib adjacent in the crawler circumferential direction. The amount of mud adhering between 44 and the connecting rib 45 can be reduced.

  In the rubber crawler 10, in the long lug 39 and the short lug 42 connected by the connecting rib 44, the crawler circumferential one end of the top surface 39S and the crawler circumferential one end of the top surface 42S are on the first straight line SL1. Since the other end portion in the crawler circumferential direction of the surface 39S and the other end portion in the crawler circumferential direction of the top surface 42S are on the second straight line SL2, for example, when traveling on leveling, the top surface 39S of the connected long lugs 39 and Since the crawler circumferential one ends of the top surface 42S of the short lug 42 are simultaneously grounded (depressed) and the other crawler circumferential other ends are simultaneously separated (kicked out) from the grounded surface, vibration during running is reduced. The

  Similarly to the above, in the long lug 41 and the short lug 40 connected by the connecting rib 45, the crawler circumferential one end portion of the top surface 41S and the crawler circumferential one end portion of the top surface 40S are on the first straight line SL3. Since the crawler circumferential other end of the top surface 41S and the crawler circumferential other end of the top surface 40S are on the fourth straight line SL4, for example, during leveling, the top surface of the connected long lug 41 Since the crawler circumferential one ends of 41S and the top surface 40S of the short lug 40 are simultaneously grounded (depressed) and the other crawler circumferential other ends are simultaneously separated (kicked out) from the grounded surface, vibration during running is generated. Reduced.

  Moreover, as shown in FIG. 3, since the groove part 46 extends in the crawler width direction and has a plurality of bent parts in the crawler circumferential direction, it enters the groove part when traveling on rough terrain such as an inclined field. The soil mass that has been squeezed and the bent portion of the groove (the wall surface of the lug or the connecting rib that forms the bent portion) abut against each other, and the side slip of the elastic crawler is suppressed by the shear stress of the soil mass.

  On the other hand, as shown in FIG. 3, in the rubber crawler 10, the connecting rib 44 and the long lug 39 and the short lug 42 connected by the connecting rib 44 are disposed between the core bars 20 adjacent to each other in the crawler circumferential direction. Is arranged. Further, the connecting rib 45 and the long lug 41 and the short lug 40 connected by the connecting rib 45 are arranged between the core bars 20 adjacent to each other in the crawler circumferential direction. As a result, the rigidity of the rubber crawler 10 in the crawler circumferential direction approaches uniformly, so that the vibration caused by the rigidity step (unevenness) from the wheel 104 rolling on the wheel passing surface 36 is reduced, and the crawler vehicle Ride comfort is improved.

  And by providing the connection rib 44 and the connection rib 45 in the crawler main body 12, traction force improves more than what is not provided, for example. On the other hand, the connecting rib 44 improves the rigidity of the long lug 39 and the short lug 42 in the crawler circumferential direction and the crawler width direction, and the connecting rib 45 improves the rigidity of the long lug 41 and the short lug 40 in the crawler circumferential direction and the crawler width direction. Will improve. In particular, wear and rubber chipping of the inner end portions 39C to 42C of the lugs 39 to 42 receiving loads from the sprocket 100, the idler (not shown), and the wheel 104 are suppressed.

[Other Embodiments]
In the first embodiment, the long lugs 39 and 41 have inclined portions 39A and 41A, respectively, and the short lugs 40 and 42 are inclined with respect to the crawler circumferential direction, but the present invention is not limited to this configuration. For example, a lug extending linearly in the crawler width direction alternately in the crawler circumferential direction across the center line CL (in other words, forming a linear lug in a staggered pattern in the crawler circumferential direction) By connecting the inner end portions of the lugs with the connecting ribs, the soil discharge performance can be improved as in the first embodiment.

  In the above-described embodiment, the crawler width direction center line of the crawler main body 12 and the crawler width direction center line of the cored bar 20 are configured to match, but the present invention is not limited to this configuration and does not match. It doesn't matter. For example, like the rubber crawler 50 shown in FIGS. 8 to 11, the crawler width direction center line CL of the core metal 20 may be shifted in the crawler width direction with respect to the crawler width direction center line of the endless crawler body 52. . The rubber crawler 50 having such a configuration will be described below. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted. As shown in FIG. 9, in the crawler body 52, a short lug 54 is located between the core bars 20 adjacent to each other in the crawler circumferential direction on one side (left side in FIG. 9) in the crawler width direction across the center line CL. In this way, a plurality of cores adjacent to each other in the crawler circumferential direction are arranged on the other side in the crawler width direction (right side in FIG. 9) across the center line CL. They are alternately arranged in the crawler circumferential direction so as to be positioned between the golds 20. 8 to 11, reference numerals 54S, 54C and 54E (which reach the width end 52E of the crawler main body 52) are the top surface of the short lug 54, the inner end portion on the center line CL side, and the outer end portion, respectively. Reference numerals 55S, 55C, and 55E of the long lug 55 (reaching the width end 52E of the crawler body 52) indicate the top surface of the long lug 55, the inner end portion on the center line CL side, and the outer end portion, respectively. Reference numerals 56S, 56C, and 56E denote a top surface of the short lug 56, an inner end portion on the center line CL side, and an outer end portion, respectively. Further, the inner end portion 54C of the short lug 54 and the inner end portion 55C of the long lug 55 are connected by a connecting rib 58 inclined in the crawler circumferential direction, and the inner end portion 54C of the short lug 54 and the inner end portion of the short lug 56 are connected. 56C is connected by a connecting rib 57 inclined in the crawler circumferential direction. In addition, the rubber crawler 50 can also improve the soil removal property like the rubber crawler 10 of the first embodiment.

  In the above-described embodiment, the rubber crawlers 10 and 50 are elastic crawlers configured to maintain tension by the reinforcing layer 48. However, the present invention is not limited to this configuration, and the adjacent layers without using the reinforcing layer 48. So-called link-type elasticity in which the cores 20 to be connected are connected by a ring-shaped connecting member, or the connecting portions formed on each core metal are connected to each other, and the tension of the elastic crawler is maintained between the connected core metals. It may be a crawler.

  Furthermore, in the above-described embodiment, the rubber crawlers 10 and 50 are made of a rubber material as an example of an elastic body. However, the present invention is not limited to this configuration, and the rubber crawlers 10 and 50 are made of an elastomer other than rubber. May be configured.

  Furthermore, in the above-described embodiment, the cored bar 20 is made of metal. However, the present invention is not limited to this configuration, and the cored bar 20 may be provided with sufficient rigidity with respect to the specifications of the rubber crawlers 10 and 50. For example, it may be made of resin.

  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 Crawler body (Crawler body)
20 cored bar 39 long lugs (rugs)
39C Inner end (end on the center line side)
40 Short rug
40C Inner end (end on the center line side)
41 Long rug
41C Inner end (end on the center line side)
42 Short rug
42C Inner end (end on the center line side)
44 connecting rib 45 connecting rib 50 rubber crawler (elastic crawler)
52 Crawler body 54 Short lugs
54C Inner end (end on the center line side)
55 Long rug
55C Inner end (end on the center line side)
56 Short Rug (Rug)
56C Inner end (end on the center line side)
57 Connecting rib 58 Connecting rib 100 Sprocket (drive wheel)
S Crawler circumferential direction W Crawler width direction IN Crawler inner circumference OUT Crawler outer circumference

Claims (3)

A crawler main body formed in an endless belt shape by an elastic body, a plurality of cored bars are embedded in the crawler circumferential direction at intervals, and wound around a driving wheel and a driven wheel;
The crawler body protrudes from the crawler outer peripheral side, and is disposed on both sides of the crawler width direction center line of the core metal as viewed from the crawler outer peripheral side, and a plurality of crawler circumferential directions are arranged in the crawler width direction. A lug in which the ends on the side of the center line adjacent to each other are shifted in the crawler circumferential direction;
The projecting from the crawler circumferential side crawler body, extends inclined when viewed from the crawler circumferential side in the crawler circumferential direction, connecting the ends of the center line side of the lug adjacent to each other in the crawler width direction, high A connecting rib that is lower than the lug ,
Elastic crawler with. The two lugs connected by the connecting ribs have one end portion in the crawler circumferential direction on the crawler width direction on the first straight line along the crawler width direction as viewed from the crawler outer peripheral side. The elastic crawler according to claim 1 , wherein the other end of the direction is on a second straight line along the crawler width direction. 3. The elastic crawler according to claim 1 , wherein at least a portion of the lug on the connection rib side is inclined in a direction opposite to an inclination direction of the connection rib.

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