JP2012188082A - Core metal for crawler and elastic crawler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the increase of weight while restraining the wear of a driving wheel contact part.SOLUTION: A core metal 20 includes: a core metal base body 22, which is disposed on the inner circumferential part of a rubber body 12 of an endless belt form wound around the sprocket and rolling wheels and keeps the width direction of a rubber body turning in the longitudinal direction; a sprocket contacting side 30 formed on the core metal base body for use in the sprocket's locking; a pair of trank rollers contacting sides 34, for use in allowing contact with a pair of roller parts 104B, which are respectively formed on both sides in the longitudinal direction of the sprocket contacting surface of the core metal base body; and a pair of protrusions 38 formed on both sides in the longitudinal direction of the core metal base body with a pair of trank rollers contacting sides 34 in between, while projecting into inside of the rubber body, with the projecting height from the trank rollers contacting sides 34 of the inner wall surface 40 becoming higher from inside in the longitudinal direction to outside, with the angle against the rollering wheels contacting sides 34 at an intermediate part of the inner wall surface 40 in the inner wall projecting direction being greater in outside in the longitudinal direction than inside, thus regulating the movement of the trank rollers in the longitudinal direction by the contact with the inner wall surface 40.

Description

  The present invention relates to a core metal for a crawler and an elastic crawler using the same.

  In recent years, endless rubber crawlers have been widely used in traveling parts of agricultural machines, construction machines, and civil engineering machines.

  A rubber crawler is usually used by being wound around a sprocket, an idler, and a wheel of a vehicle, and the sprocket, the idler, and the wheel roll on the inner peripheral side. Among these types of rubber crawlers, there is a type in which the sprocket, idler, and rolling wheel roll on a reinforcing metal core disposed at regular intervals in the circumferential direction on the inner peripheral portion of the rubber crawler. is there.

  In the case of the above-described type of rubber crawler, if the distance between the core bars adjacent to each other is too long, for example, when a wheel that supports the vehicle weight rolls from one core bar to the other core bar adjacent thereto. The gap between the core bars greatly falls downward, and the vibration (vertical movement) of the wheel tends to increase.

For this reason, in Patent Documents 1 and 2, a shoulder portion extending in the circumferential direction of the rubber crawler (the rolling direction of the wheel) is formed on the outer side in the width direction of the rubber crawler than the pair of protrusions formed on the core metal. The shoulder is used as a rolling part of the wheel.
As a result, the distance between the rolling portions (shoulders) of the core bars adjacent to each other is shortened, and when the rolling wheel rolls from one core bar to the other core bar adjacent thereto, it moves downward. The sagging amount is reduced, and the vibration of the wheel is suppressed.

JP 2006-27376 A Japanese Utility Model Publication No. 63-176888

  By the way, as for the metal core of patent documents 1 and 2, a sprocket rolls on the central part of the metal core between a pair of protrusions, and an outer ring type wheel on the shoulders on both outer sides in the width direction of the pair of protrusions. A pair of wheel portions of a wheel (a roller wheel provided with a pair of wheel portions on both ends of the shaft portion) rolls.

Here, when the rubber crawler travels on a sloping ground (the ground inclined with respect to the horizontal plane), the core metal together with the rubber crawler tilts along the sloping ground. The ring portion on the lower side in the tilt direction of the rolling wheel may be separated from the shoulder portion on the lower side in the tilt direction with the contact portion between the ring portion and the shoulder portion on the upper side in the tilt direction as a fulcrum. If running on an inclined ground in such a state continues, there is a risk that the wheel part on the lower side in the inclination direction of the wheel will get over the protrusion on the lower side in the inclination direction of the core metal, so that the protrusion is raised so that the wheel part cannot get over. There is a need to.
However, if the protrusion is raised, the bending moment acting on the root portion of the protrusion is increased, so that the base portion of the protrusion has to be thickened, and the core bar becomes heavy.

On the other hand, in consideration of the above-mentioned traveling on an inclined ground, the ring portion of the inner ring type wheel (the wheel portion formed on the shaft center (inner side)) rolls on the center portion of the core metal. There is. Compared with an outer ring type wheel, such an inner ring type wheel is less likely to move away from the rolling part (core metal central part) than the outer ring type wheel, so that the protrusion does not need to be raised. It is possible to suppress the protrusion of the ring portion when traveling on an inclined land.
However, since the inner ring type roller rolls on the central part of the core metal like the sprocket, the central part of the core metal is easily worn.

  An object of this invention is to suppress the increase in weight, suppressing the abrasion of the part which a driving wheel contacts.

  The core metal for a crawler according to claim 1 is disposed on an inner peripheral portion of an endless belt-like elastic body wound around a driving wheel and a wheel, and extends in the width direction of the elastic body so that the width direction becomes a longitudinal direction. A cored bar base, a driving wheel contact surface formed on the cored bar base and used for engaging the driving wheel, and formed on both outer sides in the longitudinal direction across the driving wheel contact surface of the cored bar base. A pair of wheel contact surfaces for contact with a pair of wheel portions provided on the wheel, and a pair of wheel contact surfaces of the cored bar base formed on both outer sides in the longitudinal direction, Projecting inward of the elastic body, the height of the inner wall surface on the inner side in the longitudinal direction in the projecting direction from the wheel contact surface increases from the inner side in the longitudinal direction toward the outer side, and the middle of the projecting direction of the inner wall surface The angle with respect to the wheel contact surface at the part is more than the inner side in the longitudinal direction. Increases and at the side, and has a pair of protruding portions for restricting the contact between the longitudinal direction the inner wall to move with the wheel portion of the rolling wheel.

When the elastic crawler having the crawler cored bar of claim 1 disposed on the inner peripheral portion of the endless belt-like elastic body at a distance in the circumferential direction of the elastic crawler travels on a flat ground, the elastic crawler is wound around the driving wheel and the wheel. The elastic body circulates between the drive wheel and the wheel. At this time, the drive wheel passes through the drive wheel contact surface while engaging with the drive wheel contact surface, and the pair of wheel portions of the wheel passes through the wheel contact surface while contacting the pair of wheel contact surfaces, respectively. To do.
Here, since the driving wheel contact surface is for engagement of the driving wheel and the pair of wheel contact surfaces is for contact with the pair of wheel portions, for example, the wheel portion of the wheel is in contact with the driving wheel contact surface. The wear of the driving wheel contact surface can be suppressed as compared with the case of passing through the driving wheel contact surface.

  Further, when the elastic crawler travels on a flat ground, the movement (in other words, the movement of the elastic body in the width direction) in the longitudinal direction of the core metal base (hereinafter referred to as “core metal longitudinal direction” as appropriate) of the wheel is a ring portion. And the contact with the inner wall surface of the protrusion.

  On the other hand, when the elastic crawler travels on an inclined ground, the ground-side elastic body and the crawler core are inclined along the inclined ground. Here, depending on the inclination of the inclined ground, the lower part of the rotating wheel is in the inclined direction with the contact portion between the one wheel part on the upper side in the inclined direction of the wheel and the one wheel contact surface on the upper side in the inclined direction as a fulcrum. The other wheel part may be separated (lifted) from the other wheel contact surface on the lower side in the tilt direction, but the one wheel part on the upper side in the tilt direction of the wheel is on the inner wall surface of the protruding part on the upper side in the tilt direction. The movement of the roller wheel in the longitudinal direction of the metal core (movement of the elastic body in the width direction) is restricted.

  In the crawler cored bar, the height in the protruding direction of the inner wall surface of the protruding portion from the wheel contact surface is increased from the inner side to the outer side in the longitudinal direction of the cored bar, and the intermediate part of the inner wall surface in the protruding direction. The angle with respect to the wheel contact surface is larger on the outer side than on the inner side in the longitudinal direction of the core metal. For this reason, when the positions of the base end portion (start end portion) and the tip end portion (end end portion) of the inner wall surface in the protruding direction are the same, the crawler cored bar is, for example, at the intermediate portion of the inner wall surface. The length from the proximal end portion to the distal end portion of the inner wall surface is longer than that in which the angle with respect to the wheel contact surface is constant. That is, when the elastic crawler travels on an inclined ground, when one of the wheels on the upper side in the inclination direction rides on the inner wall surface of the protrusion on the upper side in the inclination direction, the moving distance until the wheel part gets over the protrusion is extended. . As a result, even if the ring portion rides on the inner wall surface, the inclination of the sloping ground becomes gentle before moving to the position where the ring portion gets over the protruding portion, or the ring portion is made inward by stopping the elastic crawler. Since it returns (falls) along the wall surface to the wheel contact surface, it is possible to prevent the protruding portion of the wheel from getting over. For this reason, in order to suppress the overcoming of the protrusion part of a ring | wheel part, the weight increase of the metal core resulting from making a protrusion part high more than necessary can be suppressed.

  From the above, according to the crawler cored bar, it is possible to suppress an increase in weight while suppressing wear of the driving wheel contact surface with which the driving wheel contacts.

  The crawler core bar according to claim 2 is the crawler core bar according to claim 1, wherein an intermediate portion of the inner wall surface in the protruding direction is linearly inclined with respect to the protruding direction. And a second inner wall surface portion that is inclined with respect to the projecting direction and extends linearly and has a larger angle with respect to the wheel contact surface than the first inner wall surface portion, and the first inner wall surface portion and the The second inner wall surface portion is continuous.

  In the core for a crawler according to claim 2, the intermediate portion of the inner wall surface in the protruding direction includes a first inner wall surface portion and a second inner wall surface portion having a larger angle with respect to the wheel contact surface than the first inner wall surface portion. is doing. For this reason, for example, while restricting the movement of the wheel in the longitudinal direction of the metal core (the width direction of the elastic body) at the first inner wall surface portion, from the proximal end portion to the distal end portion in the protruding direction of the inner wall surface at the second inner wall surface portion. Can be lengthened.

  Further, in the crawler core bar, for example, even if the wheel portion of the wheel runs on the second inner wall surface portion, the first inner wall surface portion and the second inner wall surface portion are respectively inclined linearly with respect to the protruding direction, Furthermore, since the first inner wall surface portion and the second inner wall surface portion are connected to each other, the ring portion can be smoothly guided (returned) to the wheel contact surface along the second inner wall surface portion and the first inner wall surface portion. it can.

  The crawler core metal according to claim 3 is provided with a plurality of endless belt-like elastic bodies wound around the drive wheels and the rolling wheels, and a plurality of inner ends of the elastic bodies at intervals in the circumferential direction of the elastic bodies. A crawler cored bar according to claim 1 or claim 2.

  The elastic crawler according to claim 3 has the crawler cored bar according to claim 1 or 2, so that, for example, the drive wheel is less than the crawler cored bar. It is possible to suppress an increase in weight while suppressing wear of a contacting portion.

  As described above, the crawler mandrel and the elastic crawler of the present invention can suppress an increase in weight while suppressing wear of a portion in contact with the drive wheel.

It is the side view which looked at the rubber crawler concerning a 1st embodiment of the present invention from the side (crawler width direction). It is a top view which shows the inner peripheral part of the rubber crawler which concerns on 1st Embodiment of this invention. It is a perspective view of the core metal for crawlers concerning a 1st embodiment of the present invention. (A) It is a top view of the core metal for crawlers concerning 1st Embodiment of this invention. (B) It is the front view of the core metal for crawlers which looked at the metal core for crawlers of Drawing 4 (A) from the direction of arrow 4B. (C) It is the side view of the core metal for crawlers which looked at the metal core for crawlers of FIG. 4 (B) from the arrow 4C direction. (D) It is the enlarged view which expanded the arrow 4D vicinity (protrusion part vicinity) of the core metal for crawlers of FIG. 4 (B). FIG. 3 is a cross-sectional view taken along line XX of FIG. 2 in a state where the elastic crawler according to the first embodiment of the present invention travels on a flat ground. FIG. 3 is a cross-sectional view taken along line XX of FIG. 2 in a state where the elastic crawler according to the first embodiment of the present invention travels on an inclined ground. (A) The elastic crawler according to the first embodiment of the present invention travels on an inclined ground, and the width direction of the elastic crawler shows a state in which the wheel portion of the wheel rides on the second inner wall surface portion of the protruding portion of the core for crawler. FIG. (B) A part along the width direction of the elastic crawler showing a state in which the rolling wheels riding on the second inner wall surface portion of the projecting portion of FIG. 7 (A) descend from the second inner wall surface portion to the wheel contact surface It is sectional drawing. It is an enlarged view of the vicinity of the protrusion, showing a first modification of the protrusion of the crawler core bar according to the first embodiment of the present invention. It is an enlarged view of the vicinity of the protruding portion, showing a second modification of the protruding portion of the core metal for a crawler according to the first embodiment of the present invention. It is a perspective view of the core metal for crawlers concerning other embodiment of the present invention.

(First embodiment)
Hereinafter, a core metal for a crawler (hereinafter simply referred to as “core metal”) and an elastic crawler according to a 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 and an example of a driven wheel that are examples of driving wheels of a crawler vehicle (for example, a tractor). It is used by being wound around a certain idler 102 and a plurality of rolling wheels 104 disposed between the sprocket 100 and the idler 102.

  Further, the sprocket 100, the idler 102, the wheel 104, and the rubber crawler 10 wound around the sprocket 100 constitute a crawler traveling device 90 (see FIG. 1) as a traveling unit of the crawler vehicle.

In the present embodiment, the circumferential direction (arrow S in the figure) of the endless rubber crawler 10 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”. To do. The crawler circumferential direction and the crawler width direction are orthogonal to each other when the rubber crawler 10 is viewed from the outer peripheral side or the inner peripheral side (see FIG. 2).
In the present embodiment, the inside of the rubber crawler 10 (arrow IN in the figure) is described as “crawler inside”, and the outside of the rubber crawler 10 (arrow OUT in the figure) is described as “crawler outside”.

As shown in FIG. 1, the rubber crawler 10 has a rubber body 12 in which a rubber material is formed in an endless belt shape. In addition, the rubber body 12 of this embodiment is an example of the elastic body of the present invention.
Further, the width direction, the circumferential direction, the inner side, and the outer side of the rubber body 12 of the present embodiment coincide with the crawler width direction, the crawler circumferential direction, the crawler inner side, and the crawler outer side, respectively.

  As shown in FIG. 2 and FIG. 5, a plurality of core bars 20 are arranged on the inner peripheral portion of the rubber body 12 with an interval (a constant interval in this embodiment) in the crawler circumferential direction.

  As shown in FIGS. 2 and 5, the cored bar 20 is disposed on the inner peripheral portion of the rubber body 12, and has a cored bar base 22 extending in the width direction of the rubber body 12 and having the width direction as a longitudinal direction. is doing. The longitudinal direction of the cored bar base 22 (hereinafter referred to as “cored bar longitudinal direction”) and the width direction of the rubber body 12 (crawler width direction) coincide with each other. Further, the width direction of the cored bar base 22 (hereinafter referred to as “core bar width direction”) is a flat part of the rubber crawler 10 (excluding a curved part wound around the sprocket 100 or the idler 102). 1, for example, the portion indicated by the symbol F in FIG. 1) and the circumferential direction (crawler circumferential direction) of the rubber body 12. For this reason, in FIGS. 2 to 5, the core metal longitudinal direction is indicated by an arrow W, and the core metal width direction is indicated by an arrow S.

  As shown in FIGS. 3 and 4, the cored bar base 22 includes a thick part 24 constituting a central part in the longitudinal direction of the cored bar, and a pair of thick parts 24 extending from both ends in the longitudinal direction of the cored bar. And a wing part 26. As shown in FIG. 4B, the wing part 26 is thinner than the thick part 24.

As shown in FIGS. 3 and 4, a sprocket contact surface 30 for engaging the sprocket 100 is formed at the central portion 28 of the thick portion 24 in the core metal longitudinal direction. The sprocket contact surface 30 includes a flat surface 31 (see FIGS. 4B and 4C) along the longitudinal direction and the width direction of the core bar inside the crawler of the center portion 28, and the core of the center portion 28. The side wall surfaces 32 on both sides in the gold width direction (see FIGS. 3 and 4A) are included. Further, the flat surface 31 and the side wall surface 32 are continuous. The flat surface 31 is in direct contact with the outer peripheral surface of the disc portion 100A constituting the sprocket 100 when the sprocket 100 passes through. Further, when the sprocket 100 passes through the side wall surface 32, tooth portions formed at intervals in the circumferential direction of the disc portion 100A are brought into contact directly or via a rubber material.
The sprocket contact surface 30 of the present embodiment is an example of the drive wheel contact surface of the present invention.

  In addition, the sprocket contact surface 30 includes a pair of disk-shaped ring portions 104B projecting from both ends in the axial direction of the shaft portion 104A constituting the wheel 104 to the outer periphery and passes through a pair of wheel contact surfaces 34 described later. In the meantime, it is located between the pair of wheel portions 104B.

  In the present embodiment, the idler 102 also passes through the sprocket contact surface 30 while contacting the sprocket contact surface 30 (flat surface 31).

  As shown in FIGS. 4 and 5, a pair of wheel contacts for contacting a pair of wheel portions 104 </ b> B of the wheel 104 are disposed inside the crawler on both outer sides in the longitudinal direction of the core metal with the central portion 28 of the thick portion 24 interposed therebetween. A surface 34 is formed. A pair of wheel portions 104 </ b> B come into contact with the pair of wheel contact surfaces 34 when the wheel 104 passes. The roller contact surface 34 is a flat surface along the longitudinal direction of the core metal and the width direction of the core metal as shown in FIGS. 4 (B) and 4 (C). The outer peripheral surfaces of the pair of ring portions 104B are in direct contact with each other.

As shown in FIGS. 4 (B) and 4 (C), the wheel contact surface 34 extends in the core metal width direction on both outer sides in the longitudinal direction of the core metal with the central portion 28 of the thick part 24 interposed therebetween. A pair of rail portions 36 are respectively formed in the core metal length direction extending from the thick portion 24 in the core metal width direction.
In the present embodiment, the pair of rail portions 36 are formed on both sides of the thick portion 24 in the core metal width direction (that is, the rail portions 36 are formed at four locations of the thick portion 24). The roller contact surface 34 is extended in the core metal width direction by the surface inside the crawler of these rail portions 36. In other embodiments of the present invention, the wheel contact surface 34 may not be extended by the rail portion 36.

  As shown in FIG. 4B, the pair of wheel contact surfaces 34 and the sprocket contact surface 30 are flush with each other, and the pair of wheel contact surfaces 34 and the sprocket contact surface 30 are continuous.

  As shown in FIGS. 4B and 5, the pair of wings 26 of the core metal base 22 has a pair of base portions protruding inward from the roller contact surface 34 along the core metal thickness direction. A protruding portion 38 is formed. That is, the pair of protrusions 38 are formed on both outer sides in the longitudinal direction of the core metal with the pair of wheel contact surfaces 34 interposed therebetween. Here, the “core metal thickness direction” is a direction perpendicular to the core metal longitudinal direction and the core metal width direction, and in the flat portion F of the rubber crawler 10, the thickness direction of the rubber body 12 ( Crawler inside and outside direction).

  As shown in FIGS. 4B and 4D, the inner wall surface 40 on the inner side in the core metal longitudinal direction of the protruding portion 38 has a protruding height from the wheel contact surface 34 from the inner side in the core metal longitudinal direction to the outer side. It is getting higher. Here, the “projection height” is a height measured along the projecting direction of the projecting portion 38 (the direction toward the inside of the crawler along the core metal thickness direction).

  In addition, an intermediate portion of the inner wall surface 40 in the protruding direction has an angle with respect to the wheel contact surface 34 that is larger on the outer side than on the inner side in the longitudinal direction of the core metal. The intermediate portion of the inner wall surface 40 of the present embodiment includes a curved surface portion 43 (details will be described later) on the proximal end portion 40A side in the protruding direction of the inner wall surface 40 and a curved surface portion 45 on the distal end portion 40B side (details will be described later). ) Refers to the part between.

  As shown in FIG. 4B, FIG. 4D, and FIG. 5, in the present embodiment, the intermediate portion of the inner wall surface 40 is linearly inclined on the base end portion 40A side and with respect to the protruding direction. First inner wall surface portion 42 that extends in the form of a second shape, and a second inner wall surface portion that is linearly inclined with respect to the protruding direction on the tip end portion 40B side and that has a larger angle with respect to the wheel contact surface 34 than the first inner wall surface portion 42. 44. The first inner wall surface portion 42 and the second inner wall surface portion 44 are continuous. Specifically, the end portion of the first inner wall surface portion 42 on the tip end portion 40B side and the end portion of the second inner wall surface portion 44 coincide with each other.

  As shown in FIG. 4D, the inner wall surface 40 of the present embodiment has a curved surface portion 43 that is curved in an arc shape between the first inner wall surface portion 42 and the wheel contact surface 34. The first inner wall surface portion 42 and the wheel contact surface 34 are continuous via the curved surface portion 43. The base end portion 40 </ b> A is an end portion on the inner side in the core metal longitudinal direction of the curved surface portion 43.

  On the other hand, the inner wall surface 40 of the present embodiment has a curved surface portion 45 that is curved in an arc shape between the second inner wall surface portion 44 and the top surface 38T of the protruding portion 38. The second inner wall surface 44 and the top surface 38T are continuous via the curved surface portion 45. The distal end portion 40B is an end portion of the curved surface portion 45 on the outer side in the longitudinal direction of the core metal.

As shown in FIG. 4D, the first inner wall surface portion 42 has an angle θ1 with respect to the wheel contact surface 34 set within a range of 100 to 130 degrees.
On the other hand, the second inner wall surface 44 has an angle θ2 with respect to the wheel contact surface 34 set in a range of 120 to 140 degrees.

  As shown in FIG. 4 (B), the length L1 along the longitudinal direction of the cored bar of the protrusion 38 is within a range of 5 to 20% of the length L0 along the longitudinal direction of the cored bar base 22. Is set. The length L1 of the projecting portion 38 of the present embodiment is the core from the base end portion 40A of the inner wall surface 40 to the end portion 39A of the outer surface 39 of the projecting portion 38 on the outer side in the longitudinal direction of the core metal. It is the length along the gold longitudinal direction.

As shown in FIG. 4B, the lower surface (surface outside the crawler) 22A of the core metal base 22 is a flat surface along the core metal longitudinal direction and the core metal width direction.
Here, when the length from the wheel contact surface 34 to the top surface 38T of the protruding portion 38 along the protruding direction is H1, and the length from the wheel contact surface 34 to the lower surface 22A of the core metal 20 is H0. , H1 is set within a range of 1.1 to 3 times of H0.

  As shown in FIGS. 2 and 5, in this embodiment, the crawler outer side portion including at least a pair of wing portions 26 of the core metal 20 is embedded in the inner peripheral portion of the rubber body 12.

  Furthermore, the cored bar 20 of the present embodiment has a straight line (center line CL of the cored bar 20) passing through the center of the thick-walled portion 24 in the longitudinal direction of the cored bar as shown in FIGS. 4 (A) and 4 (B). On the other hand, the shape is symmetrical. Further, the center line of the core bar 20 and the center line passing through the center of the rubber body 12 in the width direction coincide with each other. That is, the center line CL of the cored bar 20 coincides with the center line of the rubber crawler 10.

Further, the cored bar 20 of the present embodiment is configured by integrally molding a metal material.
The metal material used for the core metal 20 is a carbon steel material for machine structure with a hardness (HRC (Rockwell hardness (C scale) conforming to JIS Z2245)) of about 20 to 55 degrees by heat treatment (quenching) ( SC material), heat-treated (quenched) and hardened (HRC (Rockwell hardness according to JIS Z2245 (C scale))) 30-65 degrees alloy steel for mechanical structure, or heat-treated (quenched) It is preferable to use cast iron (FCD material) having a hardness (HB (Brinell hardness in accordance with JIS Z2243)) of about 250 to 500 degrees.
In addition, the material which comprises the wheel 104 of this embodiment is the machine which heat-processed (QT process) and made hardness (HRC (Rockwell hardness (C scale) based on JIS Z2245)) about 20-55 degree | times. It is a structural carbon steel material (SC material).
By forming the metal core 20 from the above metal material, it is possible to suppress wear of the sprocket contact surface 30 and the wheel contact surface 34 and to secure the strength of the metal core 20.

  As shown in FIG. 2, the rubber body 12 has an inner peripheral portion that surrounds the disc portion 100A of the sprocket 100 between the central portion 28 of the cored bar 20 adjacent to each other in the crawler circumferential direction and between the pair of rail portions 36. Engagement recesses 46 are formed to engage the teeth 100B formed at regular intervals in the direction. As for this engagement recessed part 46, 46 A of bottom parts are closed with the rubber material (refer FIG. 5).

  Since the tooth part 100B of the sprocket 100 is engaged with the engaging recess 46, the driving force from the sprocket 100 is transmitted to the rubber body 12 (rubber crawler 10). Specifically, a driving force is input from the tooth portion 100B of the sprocket 100 to the side wall surface 32 of the central portion 28 of the cored bar 20 through a rubber material constituting the wall surface of the engaging recess 46 in the crawler circumferential direction. 12 is transmitted. At this time, the root side of the tooth portion 100B comes into direct contact with the portion inside the crawler that is not covered with the rubber material on the side wall surface 32 of the cored bar 20, and the driving force is input.

  Further, in a state where the tooth portion 100B is inserted into the engaging recess 46, the movement of the sprocket 100 in the crawler width direction (core metal longitudinal direction) causes the rubber material constituting the wall surface of the engaging recess 46 in the crawler width direction to move. It is regulated by the contact between the inner wall surface 36A on the inner side in the longitudinal direction of the cored bar of the rail part 36 and the tooth part 100B.

  As shown in FIG. 2, a pair of grooves 48 extending from the engaging recess 46 to both sides in the crawler width direction are formed between the core bars 20 adjacent to each other in the crawler circumferential direction on the inner circumferential portion of the rubber body 12. Yes. By the groove portion 48, the deformation of the rubber material around the front end portion of the rail portion 36 at the portion where the rubber crawler 10 is wound is alleviated. The “wrapping portion” of the rubber crawler 10 refers to a portion (curved portion) where the rubber crawler 10 is wound around the sprocket 100 or the idler 102 and is in a curved state.

  As shown in FIG. 5, an endless belt-like reinforcing layer 50 extending along the crawler circumferential direction is embedded on both sides of the crawler width direction with the engagement recess 46 interposed therebetween on the outer side of the crawler of the metal core 20 of the rubber body 12. . The reinforcing layer 50 is used to maintain the tension of the rubber crawler 10 and covers a single reinforcing cord extending along the crawler circumferential direction or a plurality of reinforcing cords arranged in parallel along the crawler circumferential direction. Is formed. In the present embodiment, a steel cord having excellent tensile strength is used as the reinforcement cord in order to maintain the tension of the reinforcing layer 50. However, the present invention is not limited to this configuration, and the tension is sufficient to maintain the tension of the reinforcing layer 50. As long as it has strength, for example, a cord made of organic fiber may be used as the reinforcing cord.

  As shown in FIG. 1, a plurality of lugs 14 protruding outward from the crawler are formed on the outer peripheral portion of the rubber body 12 at intervals in the crawler circumferential direction. The lug 14 is a part that contacts the ground of the rubber crawler 10.

Next, the effect of the metal core 20 and the rubber crawler 10 of this embodiment will be described.
When the rubber crawler 10 travels on a flat ground, the rubber body 12 wound around the sprocket 100 and the wheel 104 circulates between the sprocket 100 and the wheel 104. At this time, as shown in FIG. 5, the sprocket 100 passes through the sprocket contact surface 30 while being engaged (contacted) with the sprocket contact surface 30, and the pair of wheel portions 104 </ b> B of the rollers 104 are sprocket contact surfaces 30. And pass through the wheel contact surface 34 while contacting the pair of wheel contact surfaces 34 respectively.

  Here, in the metal core 20, the sprocket contact surface 30 is used for engaging the sprocket 100, and the pair of wheel contact surfaces 34 is used for contacting the pair of wheel portions 104B. Wear of the sprocket contact surface 30 (particularly the flat surface 31) can be suppressed as compared with the case where 104B passes through the drive wheel contact surface while contacting the sprocket contact surface 30.

  Further, when the rubber crawler 10 travels on a flat ground, the movement of the rollers 104 in the longitudinal direction of the core metal (crawler width direction) is restricted by the contact between the ring portion 104 </ b> B and the inner wall surface 40 of the protruding portion 38.

  On the other hand, when the rubber crawler 10 travels on an inclined ground, as shown in FIG. 6, the rubber body 12 on the side contacting the inclined ground and the core metal 20 inside thereof are inclined along the inclined ground. Here, depending on the inclination (gradient) of the inclined land, there is a contact between the one wheel portion 104B on the upper side in the inclination direction of the rolling wheel 104 and the one wheel contact surface 34 on the upper side in the inclination direction together with the rubber crawler 10. The other wheel portion 104B, which is on the lower side in the tilt direction with the contact portion as a fulcrum, may move away (float) from the other wheel contact surface 34 on the lower side in the tilt direction, but it will be on the upper side in the tilt direction of the wheel 104. One wheel portion 104B abuts on the inner wall surface 40 of the protruding portion 38 on the upper side in the inclination direction, and the movement of the roller wheel 104 in the longitudinal direction of the core metal (crawler width direction) is restricted. 6 indicates a straight line that is orthogonal to the rotation axis of the wheel 104.

  Further, in the core bar 20, the protruding height of the inner wall surface 40 of the protruding portion 38 from the wheel contact surface 34 is increased from the inner side in the longitudinal direction of the core bar to the outer side, and at the intermediate portion of the inner wall surface 40 in the protruding direction. The angle with respect to the wheel contact surface 34 is larger on the outer side than on the inner side in the longitudinal direction of the cored bar. For this reason, when the positions of the base end portion (starting end portion) 40A and the tip end portion (terminal end portion) 40B of the inner wall surface 40 are the same, the cored bar 20 is, for example, a wheel at the intermediate portion of the inner wall surface 40. Compared with the case where the angle with respect to the contact surface 34 is constant, the length from the base end portion 40A to the front end portion 40B of the inner wall surface 40 becomes longer. That is, when the rubber crawler 10 travels on an inclined ground, when one of the ring portions 104B on the upper side in the inclination direction rides on the inner wall surface 40 of the protrusion portion 38 on the upper side in the inclination direction, the wheel portion 104B gets over the protrusion portion 38. Increased travel distance. As a result, even if the ring portion 104B rides on the inner wall surface 40, the inclination of the sloping ground becomes gentle before the ring portion 104B moves to the position over the protruding portion, or the rubber crawler 10 is stopped, Since the portion 104B returns (lowers) to the wheel contact surface 34 along the inner wall surface 40 due to the weight of the vehicle, the climbing of the protruding portion 38 of the wheel portion 104B is suppressed. For this reason, in order to suppress getting over the protrusion part 38 of the ring part 104B, the weight increase of the cored bar 20 resulting from making the protrusion part 38 higher than necessary can be suppressed.

  From the above, according to the core metal 20 and the rubber crawler 10, it is possible to suppress an increase in weight while suppressing wear of the sprocket contact surface 30 with which the sprocket 100 contacts.

  Further, in the core metal 20, the intermediate portion of the inner wall surface 40 includes the first inner wall surface portion 42 and the second inner wall surface portion 44 having a larger angle with respect to the wheel contact surface 34 than the first inner wall surface portion 42. ing. Therefore, for example, the first inner wall surface portion 42 regulates the movement of the rollers 104 in the longitudinal direction of the core metal (crawler width direction), while the second inner wall surface portion 44 extends from the proximal end portion 40A to the distal end portion 40B of the inner wall surface 40. Can be lengthened.

  In the core bar, for example, as shown in FIG. 7A, even if the wheel portion 104B of the roller 104 rides on the second inner wall surface portion 44, the first inner wall surface portion 42 and the second inner wall surface portion 44 are Since the first inner wall surface portion 42 and the second inner wall surface portion 44 are connected to each other in a straight line with respect to the projecting direction, the ring portion 104B is formed as shown in FIG. The inner wall surface 44 and the first inner wall surface 42 can be smoothly guided (returned) to the wheel contact surface 34.

Further, when the angle θ1 of the first inner wall surface portion 42 with respect to the wheel contact surface 34 is less than 100 degrees, the wheel portion 104B of the wheel 104 is unlikely to ride on the first inner wall surface portion 42 when the rubber crawler 10 travels on an inclined ground. There is a risk that a load is applied to the shaft portion 104 </ b> A of the wheel 104 to cause a problem in the wheel 104. When the angle θ1 exceeds 130 degrees, the wheel portion 104B of the roller wheel 104 may easily ride on the first inner wall surface portion 42 when the rubber crawler 10 travels on an inclined ground. For this reason, in the metal core 20, the angle θ1 is set in the range of 100 to 130 degrees.
Thereby, it is possible to suppress the riding on the first inner wall surface portion 42 of the wheel portion 104B when the rubber crawler 10 travels on an inclined ground while suppressing the load on the shaft portion 104A of the wheel 104.

On the other hand, when the angle θ2 of the second inner wall surface portion 44 with respect to the wheel contact surface 34 is less than 120 degrees, the length from the base end portion 40A to the distal end portion 40B of the inner wall surface 40 by the second inner wall surface portion 44 is increased. The effect is not sufficient, and there is a possibility that the moving distance until the ring part 104B riding on the inner wall surface 40 gets over the protruding part 38 cannot be secured sufficiently. Further, when the angle θ2 exceeds 140 degrees, there is a possibility that the rolling wheel 104 riding on the second inner wall surface portion 44 easily gets over the protruding portion 38. For this reason, in the metal core 20, the angle θ2 is set within a range of 120 to 140 degrees.
Accordingly, it is possible to prevent the protruding portion 38 of the wheel portion 104B from getting over when the rubber crawler 10 travels on an inclined ground while securing the moving distance until the wheel 104 gets over the protruding portion 38.

When the length L1 of the protruding portion 38 is less than 5% of the length L0 of the core metal substrate, there is a possibility that the length from the base end portion 40A to the tip end portion 40B of the inner wall surface 40 cannot be sufficiently secured. If it exceeds%, the core 20 becomes too heavy. For this reason, in the metal core 20, the length L1 of the protrusion part 38 is set within a range of 5 to 20% of the length L0 of the metal core substrate.
Thereby, it can suppress that the metal core 20 becomes too heavy, ensuring the movement distance until the wheel 104 gets over the protrusion part 38. FIG.

When the length H1 from the wheel contact surface 34 to the top surface 38T of the protrusion 38 is less than 1.1 times the length H0 from the wheel contact surface 34 to the lower surface 22A of the cored bar 20, the protrusion 38 The protrusion height from the wheel contact surface 34 is low, and the wheel portion 104B of the roller wheel 104 may easily get over the protrusion portion 38. Further, when the length H1 exceeds three times the length H0, the bending moment acting on the root portion of the protruding portion 38 is increased, so that the root portion of the protruding portion 38 needs to be thickened. Gold 20 gets heavier. For this reason, in the metal core 20, the length H1 is within a range of 1.1 to 3 times the length H0.
Thereby, it can suppress that the metal core 20 becomes too heavy, suppressing the overcoming of the protrusion part 38 of the ring part 104B.

  Further, since the wheel contact surface 34 is formed between the pair of projecting portions 38 in the core metal 20, for example, the core metal 20 is rolled onto the pair of wing portions 26 on both outer sides of the pair of projecting portions 38 in the longitudinal direction of the core metal. Since the pair of wing portions 26 can be shortened compared to the case where the ring contact surface 34 is formed, the bending moment acting on the root portion of the wing portion 26 can be reduced.

  As shown in FIG. 4D, in the first embodiment, the intermediate portion in the protruding direction of the inner wall surface 40 is constituted by the first inner wall surface portion 42 and the second inner wall surface portion 44. However, the intermediate portion of the inner wall surface 40 may be composed of a plurality of inner wall surfaces. For example, you may comprise like the inner wall surface 72 of the protrusion part 70 shown in FIG. The intermediate portion of the inner wall surface 72 is inclined from the projecting direction and extends linearly, and the first inner wall surface portion 74 is inclined to the projecting direction and extends linearly and from the first inner wall surface portion 74. A second inner wall surface 76 having a large angle with respect to the wheel contact surface 34, and a third inner wall having a larger angle with respect to the wheel contact surface 34 than the second inner wall surface portion 76 while extending in a straight line inclined with respect to the protruding direction. It is comprised with the surface part 78. FIG. Further, the first inner wall surface portion 74 and the second inner wall surface portion 76 are connected, and the second inner wall surface portion 76 and the third inner wall surface portion 78 are connected. Even when such a protruding portion 70 is applied to the cored bar 20, the same effect as in the first embodiment can be obtained.

As shown in FIG. 4D, in the first embodiment, the intermediate portion of the inner wall surface 40 in the protruding direction is composed of a linear first inner wall surface portion 42 and a linear second inner wall surface portion 44. However, the present invention is not limited to this configuration, and at least one of the first inner wall surface portion 42 and the second inner wall surface portion 44 may have a curved shape. For example, you may comprise like the inner wall surface 82 of the protrusion part 80 shown in FIG. The intermediate portion of the inner wall surface 82 is inclined with respect to the projecting direction and extends in a straight line, and extends while curving with respect to the projecting direction and is a wheel more than the first inner wall surface portion 84. The second inner wall surface portion 86 has a large angle of the tangent line L to the contact surface 34. Even when such a protrusion 80 is applied to the cored bar 20, the same effect as that of the first embodiment can be obtained.
In other embodiments of the present invention, only the first inner wall surface portion 84 may be curved, or both the first inner wall surface portion 84 and the second inner wall surface portion 86 may be curved.
Moreover, it is good also as a structure which extends the 2nd inner wall surface part 86 to the edge part inside core metal longitudinal direction of the top face 38T, and abbreviate | omits the curved surface part 45. FIG.

(Other embodiments)
As shown in FIG. 3, the core bar 20 of the first embodiment is configured to form a pair of rail portions 36 on both sides of the core bar base 22 in the core bar width direction, but the present invention is not limited to this configuration. As shown in FIG. 10, a pair of rail portions 62 and rail portions 64 having different protrusion amounts from the thick portion 24 in the width direction of the core bar are formed in the length direction of the core bar and the pair of rail portions. 62 and 64 may be formed so as to be opposite to each other across the center line CL on both sides of the core metal width direction. In FIG. 10, the inner wall surfaces of the pair of rail portions 62 and 64 on the inner side in the longitudinal direction of the core bar are indicated by reference numerals 62A and 64A, respectively.

  In each of the above-described embodiments, the center line of the rubber body 12 and the center line CL of the core metal 20 coincide with each other. However, the present invention is not limited to this configuration, and the core metal with respect to the center line of the rubber body 12 The 20 center lines CL may be shifted in the crawler width direction.

  In the above-described embodiment, the tension of the rubber crawler 10 is held by the reinforcing layer 50. However, the present invention is not limited to this configuration, and the cores adjacent to each other in the crawler circumferential direction without using the reinforcing layer 50 are used. The golds 20 are connected to each other with a connecting member (for example, a ring-shaped connecting member), or the connecting parts (for example, hooks and pins) formed on the core metal are connected to each other, and the rubber track is connected to the core metal in this connected state. It is good also as a structure holding the tension | tensile_strength.

  Furthermore, in the embodiment described above, the rubber 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 body 12 may be formed of an elastomer other than rubber. Good.

  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 body (elastic body)
20 Core (Crawler core)
22 Core metal base 30 Sprocket contact surface (drive wheel contact surface)
34 Rolling wheel contact surface 38 Protruding portion 40 Inner wall surface 42 First inner wall surface portion 44 Second inner wall surface portion 60 Core metal (core metal for crawler)
70 Protruding portion 72 Inner wall surface 74 First inner wall surface portion 76 Second inner wall surface portion 78 Third inner wall surface portion 80 Protruding portion 82 Inner wall surface 84 First inner wall surface portion 86 Second inner wall surface portion 100 Sprocket (drive wheel)
104 Rolling wheel 104B Ring part CL Center line S Crawler circumferential direction, core metal width direction W Crawler width direction, core metal longitudinal direction IN Crawler inside OUT Crawler outside

Claims (3)

A core metal base disposed on an inner peripheral portion of an endless belt-like elastic body wound around the drive wheel and the rolling wheel, extending in the width direction of the elastic body and having the width direction as a longitudinal direction;
A drive wheel contact surface formed on the cored bar base and used for engagement of the drive wheel;
A pair of wheel contact surfaces formed on both outer sides in the longitudinal direction across the drive wheel contact surface of the core metal base and used for contacting a pair of wheel portions provided on the wheel;
The core metal base is formed on both outer sides in the longitudinal direction across the pair of wheel contact surfaces, protrudes inward of the elastic body, and protrudes from the wheel contact surface on the inner wall surface in the longitudinal direction. The height of the inner wall surface increases from the inner side in the longitudinal direction to the outer side, and the angle of the inner wall surface with respect to the wheel contact surface at the intermediate portion in the protruding direction is larger than the inner side in the longitudinal direction, and A pair of projecting portions for restricting movement of the rolling wheel in the longitudinal direction by contact between the wheel portion and the inner wall surface;
A core for a crawler.   An intermediate portion of the inner wall surface in the projecting direction is inclined first with respect to the projecting direction and extends linearly, and is inclined with respect to the projecting direction and extends linearly with the first inner wall surface portion. 2. The crawler core bar according to claim 1, further comprising a second inner wall surface portion having a larger angle with respect to the wheel contact surface than the first inner wall surface portion and the second inner wall surface portion. An endless belt-like elastic body wound around the driving wheel and the rolling wheel;
The crawler core bar according to claim 1 or 2, wherein a plurality of metal bars are disposed on the inner peripheral portion of the elastic body at intervals in the circumferential direction of the elastic body.
Elastic crawler with.

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