JP2021062827A - Elastic crawler - Google Patents

Abstract

To provide an elastic crawler excellent in durability.SOLUTION: An elastic crawler includes a body composed of an elastic material, and a plurality of projections arranged on an inner peripheral surface of the body. The projections include an elastic material part 31 and a resin member 32. The resin member 32 includes a crawler width direction side face part 321. A side face part 321 has a crawler thickness direction end edge 325A forming an interface BS with the elastic material part 31. An outside corner part 325a of an end edge 325A is formed of such a shape as to be rounded toward an inner surface F321i from an outer surface F321o of the side face part 321.SELECTED DRAWING: Figure 5B

Description

The present invention relates to elastic crawlers.

As a conventional elastic crawler, there is a rubber crawler that enables contact between the resin member and the rolling wheel by exposing the resin member in the crawler width direction of the rubber protrusion provided on the inner peripheral surface of the crawler body (for example). , Patent Document 1). According to such an elastic crawler, it is possible to provide an elastic crawler having excellent durability by suppressing wear of the rubber protrusions and the like.

JP-A-2007-210447

However, when the rubber and the resin are integrally formed, a difference in rigidity occurs from the interface formed between the rubber and the resin as a base point. Therefore, if strain is concentrated on the interface, there is a concern that the rubber may be cracked. Therefore, the conventional elastic crawler also has room for further improvement in terms of improving durability.

An object of the present invention is to provide an elastic crawler having excellent durability.

The elastic crawler according to the present invention includes a crawler body that is formed in an endless band shape and is made of an elastic material, and a plurality of protrusions that are arranged at intervals on the inner peripheral surface of the crawler body. The protrusion includes an elastic material portion and a resin member, the resin member includes a side surface portion in the crawler width direction, and the crawler width direction side surface portion forms an interface with the elastic material portion. It has an edge in the crawler thickness direction, and the outer corner portion in the crawler width direction of the edge in the crawler thickness direction is a side surface portion in the crawler width direction from the outer surface of the side surface portion in the crawler width direction in a cross-sectional view in the crawler width direction. It has a rounded shape toward the inner surface. According to the elastic crawler according to the present invention, the durability is excellent.

In the elastic crawler according to the present invention, the edge in the crawler thickness direction of the side surface portion in the crawler width direction is continuous with the outer corner portion in the crawler width direction and the inner surface of the side surface portion in the crawler width direction in a cross-sectional view in the crawler width direction. It is preferable to have a flat portion extending flatly toward. In this case, the durability is further improved.

In the elastic crawler according to the present invention, at the crawler thickness direction end edge of the crawler width direction side surface portion, the crawler width direction inner corner portion of the crawler thickness direction end edge is the crawler width direction side surface in the crawler width direction cross-sectional view. It is preferable that the portion has a rounded shape from the inner surface of the portion toward the outer surface of the side surface portion in the crawler width direction. In this case, the durability is further improved.

In the elastic crawler according to the present invention, it is preferable that the side surface portion in the crawler width direction includes a wall portion extending inward in the crawler width direction. In this case, the durability is further improved.

In the elastic crawler according to the present invention, it is preferable that the side surface portion in the crawler width direction is exposed on the side surface portion in the crawler width direction of the elastic material portion. In this case, the durability is further improved.

In the elastic crawler according to the present invention, the resin member includes two side surfaces in the crawler width direction arranged so as to face each other in the crawler width direction, and the resin member includes the two side surfaces in the crawler width direction. It is assumed that at least one connecting portion for connecting the portions is further provided, and the protruding portion excluding the two crawler width direction side portions and the connecting portion is formed by the elastic material portion. Can be done. In this case, the durability is further improved.

In the elastic crawler according to the present invention, it is preferable that the resin member has at least one of a concave portion and a convex portion in a portion in contact with the elastic material portion. In this case, the durability is further improved.

In the elastic crawler according to the present invention, the crawler thickness direction edge of the side surface portion in the crawler width direction is an outer peripheral edge in the crawler thickness direction arranged on the outer peripheral side of the crawler, and the crawler thickness direction of the side surface portion in the crawler width direction. The outer peripheral edge is preferably arranged on the inner peripheral side in the crawler thickness direction with respect to the outer peripheral edge in the crawler thickness direction of the protrusion. In this case, the durability is further improved.

According to the present invention, it is possible to provide an elastic crawler having excellent durability.

It is a side view which shows typically an example of the crawler traveling apparatus to which the elastic crawler which concerns on one Embodiment of this invention can apply. It is a perspective view which shows the elastic crawler which concerns on one Embodiment of this invention in a partial cross section. It is a partial plan view which shows the part of the inner peripheral surface of the elastic crawler of FIG. 2 in an enlarged manner. It is a top view which shows typically the resin member which constitutes a part of the protrusion of the elastic crawler of FIG. It is a bottom view of the resin member shown in FIG. 4A. It is a front view of the resin member shown in FIG. 4A. It is a side view of the resin member shown in FIG. 4A. FIG. 4C is a cross-sectional view taken along the line CC of FIG. 4B. It is a perspective view which shows the resin member of FIG. 4A from the bottom surface of the resin member. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is an enlarged cross-sectional view showing an enlarged region X of FIG. 5A. FIG. 3 is a cross-sectional view taken along the line BB of FIG. It is an enlarged perspective view which shows schematicly the protrusion of the elastic crawler which concerns on 2nd Embodiment of this invention. FIG. 5 is a perspective view schematically showing a resin member forming a part of the protrusion of the elastic crawler of FIG. 7 from the plane side. It is a perspective view which shows schematicly from the bottom surface side of the resin member of FIG.

Hereinafter, the elastic crawler according to the embodiment of the present invention will be described with reference to the drawings. In the present specification, the "crawler width direction", "crawler thickness direction", and "crawler circumferential direction" refer to directions based on the crawler body (here, synonymous with "elastic crawler"). In the figure, the crawler width direction is indicated by an arrow WD, the crawler thickness direction is indicated by an arrow TD, and the crawler circumferential direction is indicated by an arrow CD. Further, in the present specification, the "crawler inner peripheral side" and the "crawler outer peripheral side" are also referred to as "inner peripheral side" and "outer peripheral side" based on the crawler body (here, synonymous with "elastic crawler"), respectively. ". Further, in the present specification, the "outer peripheral side in the crawler thickness direction" means the outer peripheral side of the crawler on both sides in the crawler thickness direction, and is also simply referred to as "lower side". Further, in the present specification, the "inner circumference side in the crawler thickness direction" means the inner circumference side of the crawler on both sides in the crawler thickness direction, and is also simply referred to as "upper side".

FIG. 1 is a side view schematically showing an example of a crawler traveling device to which an elastic crawler according to an embodiment of the present invention can be applied.

In FIG. 1, reference numeral 100 is a crawler traveling device to which the elastic crawler according to the first embodiment of the present invention can be applied. The crawler traveling device 100 can be used, for example, for traveling a vehicle such as an agricultural machine (tractor, combine, etc.), a construction machine (mini excavator, etc.). In this example, the crawler traveling device 100 is configured as a traveling device for a tractor.

In the example of FIG. 1, the crawler traveling device 100 includes a driving wheel 110, a driven wheel 120, and a rolling wheel 130. These are attached to the airframe of the vehicle (not shown). The drive wheel 110 is a cage-type sprocket. The squirrel-cage sprocket has a plurality of pins 110P arranged around the rotation axis O at the same pitch (in FIG. 1, only one is designated as an example). In this example, the crawler traveling device 100 includes one driving wheel 110, two driven wheels 120, and three rolling wheels 130. However, the number of the driving wheels 110, the driven wheels 120, and the rolling wheels 130 can be changed according to the configuration of the crawler traveling device 100, respectively. Further, in this example, the pin 110P is formed in a columnar shape extending in the crawler width direction, but the configuration of the pin 110P can be changed as appropriate.

Reference numeral 1A is an elastic crawler according to an embodiment of the present invention. The elastic crawler 1A is wound around the driving wheel 110, the driven wheel 120, and the rolling wheel 130.

The elastic crawler 1A includes a crawler body 2 that is formed in an endless band shape and is made of an elastic material. Further, the elastic crawler 1A includes a plurality of protrusions 3 arranged at intervals on the inner peripheral surface 21 of the crawler main body 2 (in FIG. 1, only one is exemplifiedly designated). .).

As shown in FIG. 1, each of the plurality of protrusions 3 projects from the inner peripheral surface 21 of the crawler main body 2 toward the inner peripheral side of the crawler. Further, the plurality of protrusions 3 are arranged at regular intervals in the circumferential direction of the crawler. In the present embodiment, the inner peripheral surface 11 of the elastic crawler 1A is composed of the inner peripheral surface 21 of the crawler body 2 and the outer surface F3o of the protrusion 3.

Further, the elastic crawler 1A according to the present embodiment includes a plurality of lugs 4 arranged at intervals on the outer peripheral surface 22 of the crawler body 2 (in FIG. 1, only one reference numeral is exemplified). It is attached.). Each of the plurality of lugs 4 projects from the outer peripheral surface 22 of the crawler main body 2 toward the outer peripheral side of the crawler. The shape and arrangement of the lug 4 is not limited to that shown in each figure, and any shape and arrangement can be adopted. In the present embodiment, the outer peripheral surface 12 of the elastic crawler 1A is composed of the outer peripheral surface 22 of the crawler body 2 and the outer surface of each lug 4. The lug 4 is made of an elastic material. In this example, the elastic material is rubber. The lug 4 can be integrally molded together with the crawler body 2 and can be vulcanized and adhered to the crawler body 2.

As shown by the arrow D in FIG. 1, when the drive wheel 110 rotates around the rotation axis O, each pin 110P is configured to sequentially contact the protrusion 3 of the elastic crawler 1A corresponding to the pin 110P. Has been done. The protrusion 3 has a function of transmitting the driving force from the pin 110P to the crawler body 2 when the pin 110P of the drive wheel 110 comes into contact with the protrusion 3.

FIG. 2 is a perspective view showing a partial cross section of the elastic crawler 1A.

The elastic crawler 1A according to the present embodiment is a coreless rubber crawler. As shown in FIG. 2, in the present embodiment, the plurality of protrusions 3 are respectively arranged at the center in the crawler width direction.

In the present embodiment, the crawler main body 2 includes a steel cord layer 5 embedded inside the crawler main body 2 and a reinforcing ply 6 having one or a plurality of layers (three layers in the example of the figure). Each of the steel cord layers 5 is composed of a plurality of steel cords 5a extending in parallel in the circumferential direction of the crawler (in FIG. 1, only one is designated as an example). Each reinforcing ply 6 is arranged on the outer peripheral side of the crawler with respect to the steel cord layer 5. Each of the reinforcing plies 6 has, for example, a plurality of cords 6a inclined with respect to the circumferential direction of the crawler (in FIG. 1, only one of the reinforcing plies 6 is exemplifiedly designated). Including. However, the reinforcing ply 6 may be omitted.

As illustrated in one protrusion 3 of FIG. 2, each of the plurality of protrusions 3 includes an elastic material portion 31 and a resin member 32, respectively. In this embodiment, as shown in FIG. 2, it is composed of an elastic material portion 31 and a resin member 32.

In the present embodiment, the elastic material portion 31 is an elastic protrusion provided on the inner peripheral surface 21 of the crawler main body 2. The elastic material portion 31 absorbs an impact from the outside while having strength against contact with the pin 110P. In the present embodiment, the elastic material portion 31 projects from the inner peripheral surface 21 of the crawler body 2 toward the inner peripheral side of the crawler as a part of the protrusion 3. Further, in the present embodiment, the elastic material portions 31 are arranged at the center in the crawler width direction and at regular intervals in the crawler circumferential direction as a part of the protrusions 3. The elastic material portion 31 is made of an elastic material. In this example, the elastic material is rubber as well as the lug 4.

The resin member 32 is a covering member that covers the elastic material portion 31. The resin member 32 suppresses wear and breakage of the elastic material portion 31 and reinforces the elastic material portion 31. In this embodiment, the resin member 32 is made of a polyketone resin. In the present embodiment, the resin member 32 is embedded in the elastic material portion 31. Further, in the present embodiment, a part of the resin member 32 is exposed from the elastic material portion 31. Reference numeral F31o is the outer surface of the elastic material portion 31. Further, reference numeral F32o is an outer surface of the resin member 32. In the present embodiment, the outer surface F3o of the protrusion 3 is formed by the outer surface F31o of the elastic material portion 31 and the outer surface F32o of the resin member 32. The rest of the resin member 32 excluding the exposed portion (outer surface F32o) of the resin member 32 is embedded inside the elastic material portion 31. In the present embodiment, the outer surface F31o of the elastic material portion 31 and the outer surface F32o of the resin member 32 have no step between them, and the outer surface F3o of the protrusion 3 is smoothly formed. In other words, the outer surface F3o of the protrusion 3 is the same surface (for example, the same plane) composed of the outer surface F31o of the elastic material portion 31 and the outer surface F32o of the resin member 32. However, there may be a step between the outer surface F31o of the elastic material portion 31 and the outer surface F32o of the resin member 32. For example, the outer surface F32o of the resin member 32 projects outward from the outer surface F31o of the elastic material portion 31, so that a step can be generated on the outer surface F3o of the protrusion 3.

The protrusion 3 can be formed together with the elastic material portion 31 by using, for example, an insert product of the resin member 32 and using, for example, unvulcanized rubber. Further, the protrusion 3 can be formed, for example, by adhering the resin member 32 to the elastic material portion 31. In these cases, the protrusion 3 can be vulcanized and adhered to the crawler body 2. Further, the protrusion 3 can be formed by using the resin member 32 as an insert product, for example, with unvulcanized rubber together with the elastic material portion 31 and the crawler body 2. That is, the protrusion 3 can be formed by chemically or physically bonding the elastic material portion 31 and the resin member 32.

FIG. 3 shows an enlarged part of the inner peripheral surface 11 of the elastic crawler 1A. In FIG. 3, three protrusions 3 are shown as an example.

With reference to the protrusion 3 on the upper side of the drawing of FIG. 3, in the present embodiment, the outer surface F3o of the protrusion 3 is the top surface F3t of the protrusion 3 (hereinafter, also referred to as “protrusion top surface F3t”) and the protrusion top surface. It is composed of side surfaces (F3w, F3c, F3s) of the protrusion 3 that surrounds F3t. The protrusion top surface F3t is located on the inner peripheral side of the outer surface F3o of the protrusion 3 with respect to the inner peripheral surface 21 of the crawler body 2 in the crawler thickness direction. Further, the side surface of the protrusion 3 is the outer surface F3o of the protrusion 3 excluding the protrusion top surface F3t. In the present embodiment, the side surfaces of the protrusion 3 are two crawler width direction side surfaces F3w arranged on both sides in the crawler width direction, two crawler circumferential side surfaces F3c arranged on both sides in the crawler circumferential direction, and a crawler of the protrusion 3. It is composed of four columnar corner surfaces F3s connected to the width direction side surface F3w and the crawler circumferential side surface F3c of the protrusion 3.

Here, FIG. 4A is a plan view schematically showing the resin member 32. Further, FIG. 4B is a bottom view of the resin member 32. 4C and 4D are a front view and a side view of the resin member 32, respectively. Further, FIG. 4E is a cross-sectional view taken along the line CC of FIG. 4B.

Referring to FIG. 4A, the resin member 32 includes a side surface portion 321 in the crawler width direction.

In the present embodiment, the resin member 32 includes two crawler width direction side surface portions 321 arranged in the crawler width direction so as to face each other. Further, in the present embodiment, the resin member 32 includes at least one connecting portion 322 that connects the two crawler width direction side surface portions 321. In the present embodiment, the resin member 32 includes one connecting portion 322. That is, in the present embodiment, the two crawler width direction side surface portions 321 are connected by one connecting portion 322.

In the present embodiment, the two crawler width direction side surface portions 321 have a crawler circumferential extending wall portion 321a extending in the crawler circumferential direction and a crawler width extending inward in the crawler width direction, respectively. A wall portion (wall portion) 321b extending inward in the direction is provided. Therefore, in the present embodiment, the outer surface F321o of the side surface portion 321 in the crawler width direction is composed of the outer surface F321ao of the extending wall portion 321a in the crawler circumferential direction and the outer surface F321bo of the inner extending wall portion 321b in the crawler width direction. ing.

Specifically, as shown in FIG. 4B, the two crawler width direction side surface portions 321 are each formed of a thin plate-shaped panel. In the present embodiment, one crawler width direction side surface portion 321 includes one crawler circumferential direction extending wall portion 321a and two crawler width direction inner extending wall portions 321b. In the present embodiment, each of the two crawler width direction inner extending wall portions 321b is connected to one crawler circumferential direction extending wall portion 321a. Therefore, in the present embodiment, the inner surface F321i of the side surface portion 321 in the crawler width direction is composed of the inner surface F321ai of the extending wall portion 321a in the crawler circumferential direction and the inner surface F321bi of the inner extending wall portion 321b in the crawler width direction. Has been done.

More specifically, the crawler width direction inner extending wall portion 321b is a columnar corner wall connecting the crawler width direction extending wall portion 321b1, the crawler circumferential direction extending wall portion 321a, and the crawler width direction extending wall portion 321b1. It is composed of parts 321b2. As shown in FIG. 4B, in the present embodiment, the columnar corner wall portion 321b2 has a curved shape in a plan view. As a result, as shown in FIG. 4B, the columnar corner wall portion 321b2 smoothly connects the crawler circumferential direction extending wall portion 321a and the crawler width direction extending wall portion 321b1.

As shown in FIG. 4B, in the present embodiment, the inner surface F321bi of the crawler width direction inner extending wall portion 321b is the inner surface F321b1i of the crawler width direction extending wall portion 321b1 and the inner surface F321b2i of the columnar corner wall portion 321b2. And, it is composed of. Further, as shown in FIG. 4C, in the present embodiment, the outer surface F321bo of the crawler width direction inner extending wall portion 321b is the outer surface F321b1o of the crawler width direction extending wall portion 321b1 and the outer surface of the columnar corner wall portion 321b2. It is composed of a surface F321b2o.

In the present embodiment, as shown in FIG. 4C, the columnar corner wall portion 321b2 is arranged together with the crawler width direction extending wall portion 321b1 so as to face outward in the crawler circumferential direction, and at the same time, as shown in FIG. 4D. , The crawler is arranged so as to face outward in the width direction of the crawler together with the extending wall portion 321a in the circumferential direction of the crawler.

Further, as shown in FIG. 4E, in the present embodiment, the connecting portion 322 of the resin member 32 is connected to the upper end of the side surface portion 321 in the crawler width direction. As shown in FIG. 4E, the connecting portion 322 is also formed of a thin plate-shaped panel. The connecting portion 322 is directly connected to the crawler width direction side surface portion 321 and is also indirectly connected to the crawler width direction side surface portion 321 via the rib 323. In this embodiment, the resin member 32 includes two ribs 323. The rib 323 extends in the crawler width direction along the connecting portion 322 and is connected to the inner surface F321i of the crawler width direction side surface portion 321. Specifically, the rib 323 is connected to the inner surface F321ai of the crawler circumferential extending wall portion 321a of the crawler width direction side surface portion 321.

FIG. 4F is a perspective view showing the resin member 32 from the bottom surface of the resin member 32. In this embodiment, the resin member 32 has two ribs 323. The two ribs 323 are respectively arranged at the outer ends of the connecting portion 322 in the crawler circumferential direction. Further, in the present embodiment, the resin member 32 further has a rib 324 on the inner surface F322i of the connecting portion 322. In this embodiment, the rib 324 extends in the circumferential direction of the crawler. In this embodiment, a plurality of (two in this example) ribs 324 are arranged between the two ribs 323 at intervals in the crawler width direction. The number of ribs 323 and 234 can be any number. Further, the ribs 323 and 324 can be either one.

Further, reference numeral 325 is an edge of the side surface portion 321 in the crawler width direction. The edge 325 is a surface that forms the contour of the side surface portion 321 in the crawler width direction. In the present embodiment, as will be described later, the edge 325 of the crawler width direction side surface portion 321 is the elastic material portion 31 and the crawler width direction side surface portion 321 when the crawler width direction side surface portion 321 is embedded in the elastic material portion 31. Form an interface BS with.

Here, referring to FIG. 4D, in the present embodiment, the edge 325 of the side surface portion 321 in the crawler width direction is the edge 325A forming the contour of the crawler circumferential extending wall portion 321a and the crawler width direction inner extending wall. It is composed of an edge 325B forming the contour of the portion 321b.

In the present embodiment, the edge 325A of the crawler circumferential extending wall portion 321a is an edge on the crawler thickness direction side (crawler thickness direction edge) formed so as to face the crawler thickness direction side. In the present embodiment, the edge 325A of the crawler circumferential extending wall portion 321a is an edge on the outer peripheral side in the crawler thickness direction (hereinafter, also referred to as “crawler thickness direction outer peripheral edge 325A”).

Further, referring to FIG. 4E, in the present embodiment, the end edge 325B of the crawler width direction inner extending wall portion 321b is the end edge 325B1 of the crawler width direction extending wall portion 321b1 and the end of the columnar corner wall portion 321b2. It is composed of an edge 325B2. In the present embodiment, the edge 325B1 of the crawler width direction extending wall portion 321b1 is an edge on the crawler width direction side (crawler width direction edge) formed so as to face inward in the crawler width direction. That is, in the present embodiment, the edge 325B1 of the crawler width direction extending wall portion 321b1 is the inner edge in the crawler width direction. Also. In the present embodiment, the edge 325B2 of the columnar corner wall portion 321b2 is an edge on the crawler thickness direction (crawler thickness direction edge) formed so as to face the crawler thickness direction. In the present embodiment, the edge 325B2 of the columnar corner wall portion 321b2 is an edge on the outer peripheral side in the crawler thickness direction (hereinafter, also referred to as “crawler thickness direction outer peripheral edge 325B2”).

That is, the crawler width direction side surface portion 321 has crawler thickness direction outer peripheral edge edges 325A and 325B2 as crawler thickness direction edge edges.

Here, referring to the protrusion 3 on the upper side of the drawing and the protrusion 3 in the center of the drawing in FIG. 3, in the present embodiment, the crawler width direction side surface F3w of the protrusion 3 is the elastic material portion 31 and the crawler of the resin member 32. It is composed of a side surface portion 321 in the width direction. Further, in the present embodiment, the crawler circumferential side surface F3c of the protrusion 3 is composed of the elastic material portion 31. Further, in the present embodiment, the columnar corner surface F3s of the protrusion 3 is composed of an elastic material portion 31 and a crawler width direction side surface portion 321 of the resin member 32. Further, in the present embodiment, the top surface F3t of the protrusion 3 is composed of an elastic material portion 31 and a connecting portion 322 of the resin member 32.

More specifically, referring to the protrusion 3 on the lower side of the drawing of FIG. 3, in the present embodiment, the crawler width direction side surface F3w of the protrusion 3 is the crawler circumference of the crawler width direction side surface portion 321 of the resin member 32. It is composed of an outer surface F321ao of the directional extending wall portion 321a and a crawler width direction side surface F31wo of the elastic material portion 31 connected to the crawler outer surface F321ao. Further, in the present embodiment, the crawler peripheral side surface F3c of the protrusion 3 is an elastic material connected to the outer surface F321b1o of the crawler width direction extending wall portion 321b1 of the crawler width direction side surface portion 321 of the resin member 32 and the outer surface F321b1o. It is composed of a crawler circumferential side surface F31co of the portion 31. Further, in the present embodiment, the columnar corner surface F3s of the protrusion 3 is the columnar corner of the elastic material portion 31 connected to the outer surface F321b2o of the columnar corner wall portion 321b2 of the crawler width direction side surface portion 321 of the resin member 32 and the outer surface F321b2o. It is composed of a surface F31so. Further, in the present embodiment, the top surface F3t of the protrusion 3 is composed of an outer surface F323to of the connecting portion 322 of the resin member 32 and a top surface F31to of the elastic material portion 31 connected to the outer surface F323t.

Here, FIG. 5A is a cross-sectional view taken along the line AA of FIG. In FIG. 5A, the elastic crawler 1A is shown as a cross section (cross section in the crawler width direction) shown from the crawler width direction (hereinafter, also referred to as “crawler width direction cross section”). Further, FIG. 5B is an enlarged cross-sectional view showing the region X of FIG. 5A in an enlarged manner.

As shown in FIG. 5A, the crawler width direction side surface portion 321 has a crawler thickness direction outer peripheral edge 325A (in the present embodiment, the same applies to the crawler thickness direction outer peripheral edge 325B2) forming an interface BS with the elastic material portion 31. Have.

As shown in FIG. 5B, in the present embodiment, as shown in FIG. 5B, the crawler thickness direction outer peripheral edge 325A is connected to the outer surface F321o of the crawler width direction side surface portion 321 in the crawler width direction cross-sectional view. The outer corner portion 325a, the crawler width direction inner corner portion 325b connected to the inner surface F321i of the crawler width direction side surface portion 321 and the intermediate portion 325c connected to the crawler width direction outer corner portion 325a and the crawler width direction inner corner portion 325b. It is composed of ,.

As shown in FIG. 5B, the crawler width direction outer corner portion 325a of the crawler thickness direction outer peripheral edge 325A is from the outer surface F321o of the crawler width direction side surface portion 321 to the crawler width direction side surface portion 321 in the crawler thickness direction cross-sectional view. It has a rounded shape (fillet) toward the inner surface F321i.

As shown in FIG. 5B, in the present embodiment, the outer corner portion 325a in the crawler width direction of the outer peripheral edge 325A in the crawler thickness direction is contoured by an arc having a radius of curvature Ra in a cross-sectional view in the crawler width direction. As described above, in the present embodiment, the outer corner portion 325a in the crawler width direction of the outer peripheral edge 325A in the crawler thickness direction is provided with a fillet having a radius of curvature Ra along the extending direction of the outer peripheral edge 325A in the crawler thickness direction. ing. The fillet can be formed, for example, by R processing.

Further, as shown in FIG. 5B, in the present embodiment, the outer peripheral edge 325A in the crawler thickness direction of the side surface portion 321 in the crawler width direction is connected to the outer corner portion 325a in the crawler width direction in the crawler width direction cross-sectional view, and the crawler width is concerned. It has a flat portion extending flatly toward the inner surface F321i of the directional side surface portion 321. In the present embodiment, the flat portion is an intermediate portion 325c of the outer peripheral edge 325A in the crawler thickness direction of the side surface portion 321 in the crawler width direction.

Further, as shown in FIG. 5B, in the present embodiment, the crawler width direction inner corner portion 325b of the crawler thickness direction outer peripheral edge 325A of the crawler width direction side surface portion 321 is a crawler width direction side surface portion in the crawler width direction cross-sectional view. It is formed by a rounded shape (fillet) from the inner surface F321i of 321 toward the outer surface F321o of the side surface portion 321 in the crawler width direction. As shown in FIG. 5B, in the present embodiment, the inner corner portion 325b in the crawler width direction of the outer peripheral edge 325A in the crawler thickness direction of the side surface portion 321 in the crawler width direction is contoured by an arc having a radius of curvature Rb in a cross-sectional view in the crawler width direction. It is attached. As described above, in the present embodiment, the inner corner portion 325b in the crawler width direction of the outer peripheral edge 325A in the crawler thickness direction is provided with a fillet having a radius of curvature Rb along the extending direction of the outer peripheral edge 325A in the crawler thickness direction. ing. The fillet can also be formed by, for example, R processing. The radius of curvature Ra is preferably set larger than the radius of curvature Rb. In the present embodiment, the radius of curvature Ra is set to be larger than the radius of curvature Rb. However, according to the present invention, the radius of curvature Ra can be set to be the same as or smaller than the radius of curvature Rb.

As shown in FIG. 5A, in the crawler traveling device 100 of this example, the rolling wheels 130 are a connecting shaft 132 connecting two rolling wheel main bodies 131 arranged at intervals in the crawler width direction and the rolling wheel main bodies 131. And have. Further, in this example, the outer peripheral surface of the rolling wheel main body 131 is covered with the rubber portion 133. In the crawler traveling device 100 of this example, each of the rolling wheels 130 is configured to roll on the rolling wheel passing surface 11a. That is, the elastic crawler 1A according to the present embodiment is configured to pass over the rolling wheels 130 during traveling.

Further, in the crawler traveling device 100 of this example, the protrusions 3 of the elastic crawler 1A are configured to be arranged inside the two rolling wheel main bodies 131 in the crawler width direction. The protrusion 3 has a function of guiding the rolling wheel 130 in the crawler width direction by the side surface F3w in the protrusion width direction. As a result, the derailment of the elastic crawler 1A (the elastic crawler 1A is disengaged from the rotating body such as the rolling wheel 130) is suppressed. Further, in this example, the driven wheel 120 is also configured in the same manner as the rolling wheel 130. As a result, the derailment of the elastic crawler 1A from the driven wheel 120 is also suppressed.

As in the present embodiment, if the crawler width direction side surface portion 321 is exposed to the crawler width direction side surface F31wo of the elastic material portion 31 as a part of the resin member 32 to form the crawler width direction side surface F3w of the protrusion 3, the crawler width direction side surface F3w can be formed. The protrusion 3 can be protected by the crawler width direction side surface portion 321 of the resin member 32. Further, the resin member 32 is made of a resin material having a friction coefficient lower than that of rubber. Therefore, if the protrusion 3 is formed by the elastic material portion 31 and the resin member 32 as in the present embodiment, even if a rotating body such as a rolling wheel 130 tries to ride on the protrusion 3, the rotating body slides down. Derailment of the elastic crawler 1A is less likely to occur.

On the other hand, when the protrusion 3 is formed by the elastic material portion 31 and the resin member 32, a difference in rigidity occurs due to the difference in the material from the interface BS formed between the elastic material portion 31 and the resin member 32 as a base point. Therefore, if strain is concentrated on the interface BS between the elastic material portion 31 and the resin member 32 or in the vicinity of the interface BS, there is a concern that the elastic material portion 31 may be cracked.

On the other hand, referring to FIG. 5B, in the present embodiment, in the crawler width direction side surface portion 321 of the resin member 32, the crawler width direction outer corner portion 325a of the crawler thickness direction outer peripheral edge 325A is the crawler width direction side surface portion. It has a rounded shape from the outer surface F321o of 321 toward the inner surface F321i. In the present embodiment, the interface BS between the elastic material portion 31 and the resin member 32 has a rounded chamfered shape. In this case, even if a large load is applied to the crawler width direction side surface portion 321 of the resin member 32 toward the inside in the crawler width direction, the interface BS between the elastic material portion 31 and the resin member 32 or the vicinity of the interface BS, particularly, Distortion is concentrated in the inward direction in the crawler width direction at the interface BS between the crawler width direction outer corner portion 325a and the elastic material portion 31 of the crawler thickness direction outer peripheral edge 325A of the crawler width direction side surface portion 321 or in the vicinity of the BS. Without doing so, the occurrence of strain at the interface BS between the crawler width direction outer corner portion 325a and the elastic material portion 31 or in the vicinity of the BS is reduced. Therefore, according to the present embodiment, a crack toward the inside in the crawler width direction from the interface BS between the elastic material portion 31 and the crawler thickness direction outer peripheral edge 325A of the crawler width direction side surface portion 321 of the resin member 32 or the vicinity of the BS. Is suppressed. Further, in this case, the direction of the shearing force generated in the elastic material portion 31 is a rounded shape forming the outer corner portion 325a in the crawler width direction of the outer peripheral edge 325A in the crawler thickness direction, as shown by the arrow in FIG. 6B. Along the line, the direction is such that the resin member 32 wraps around inside the side surface portion 321 in the crawler width direction. Therefore, according to the present embodiment, even if a crack occurs inward in the crawler width direction, the growth of the crack is suppressed.

Further, in the present embodiment, the intermediate portion 325c of the outer peripheral edge 325A in the crawler thickness direction is connected to the outer corner portion 325a in the crawler width direction and toward the inner surface F321i of the side surface portion 321 in the crawler width direction in the crawler width direction cross-sectional view. It is a flat part that extends flat. In this case, by leaving a flat portion between the outer corner portion 325a in the crawler width direction and the inner corner portion 325b in the crawler width direction of the outer peripheral edge 325A in the crawler thickness direction, the occurrence and growth of cracks are further suppressed. , More durability.

Further, in the present embodiment, the inner corner portion 325bi of the crawler thickness direction outer peripheral edge 325A of the crawler width direction side surface portion 321 of the resin member 32 is from the inner surface F321i of the crawler width direction side surface portion 321 in the crawler width direction cross-sectional view. It has a rounded shape toward the outer surface F321o. In this case, cracks are generated and propagated as compared with the case where the inner corner portion 325b in the crawler width direction of the outer peripheral edge 325A in the crawler thickness direction of the side surface portion 321 in the crawler width direction is not formed by the rounded shape. Is more suppressed, so that the durability is further improved.

As shown in FIGS. 5A and 5B, in the present embodiment, in the crawler width direction side surface portion 321 of the resin member 32, the crawler thickness direction outer peripheral edge 325B2 of the crawler width direction inner extending wall portion 321b is also crawler. The outer corner portion 325a in the width direction and the inner corner portion 325b in the crawler direction have a rounded shape (fillet), and the intermediate portion 325c is a flat portion.

In the present embodiment, the side surface portion 321 in the crawler width direction of the resin member 32 is connected to the inner peripheral side (upper side) in the crawler thickness direction in a cantilever state via the connecting portion 322. In this case, the side surface portion 321 of the resin member 32 in the crawler width direction is easily moved with respect to the connecting portion 322 with the inner peripheral side in the crawler thickness direction as a base point. Therefore, in the protrusion 3, of the crawler width direction side surface portion 321 of the resin member 32, the rolling wheel 130 is located near the interface BS between the crawler thickness direction outer peripheral edge edges 325A and 325B2 and the elastic material portion 31 and the interface BS. Distortion is likely to be concentrated due to contact with the crawler.

On the other hand, in the present embodiment, at least the outer peripheral edge 325A and 325B2 in the crawler thickness direction of the resin member 32 have a shape (fillet) in which the outer corner portion 325a in the crawler width direction and the inner corner portion 325b in the crawler width direction are rounded. ), And since the intermediate portion 325c is a flat portion, the occurrence and growth of cracks are further suppressed, so that the durability is further improved.

Further, in the present embodiment, the crawler width direction side surface portion 321 of the resin member 32 includes a crawler width direction inner extending wall portion (wall portion) 321b extending inward in the crawler width direction. In this case, the strength of the side surface portion 321 in the crawler width direction of the resin member 32 is improved, so that the occurrence of cracks and their growth are further suppressed, so that the durability is further improved.

Further, in the present embodiment, the crawler width direction side surface portion 321 of the resin member 32 is exposed on the crawler width direction side surface F31w of the elastic material portion 31. In this case, the crawler width direction side surface portion 321 of the resin member 32 protects the elastic material portion 31, so that wear and deformation of the protrusions 3 are suppressed, so that the durability is further improved.

Further, in the present embodiment, the resin member 32 includes two crawler width direction side surface portions 321 arranged in the crawler width direction so as to face each other, and at least connects the two crawler width direction side surface portions 321. It further includes one connecting portion 322. Further, in the present embodiment, the portion of the protrusion 3 excluding the two crawler width direction side surface portions 321 and the connecting portion 322 is formed by the elastic material portion 31. In this case, in the resin member 32, the two crawler width direction side surface portions 321 are connected as one rigid body by the connecting portion 322, so that the rigidity of the entire resin member 32 is improved, so that the durability is further improved. Further, in this case, in the resin member 32, the portion of the protrusion 3 excluding the two crawler width direction side surface portions 321 and the connecting portion 322 is formed by the elastic material portion 31, so that the resin member 32 and the elastic material portion 31 Since a large joint area is secured, the resin member 32 and the elastic material portion 31 are more firmly joined. Therefore, in this case, the durability of the entire protrusion 3 is improved, so that the durability is further improved.

By the way, in the present embodiment, the resin member 32 is configured as a thin plate material. In the present embodiment, the resin member 32 is integrally formed as one component by injection molding using a thermoplastic resin or the like. In the present embodiment, as shown in FIG. 4A, the length of the connecting portion 322 of the resin member 32 in the crawler circumferential direction is shorter than the length of the crawler width direction side surface portion 321 of the resin member 32 in the crawler circumferential direction. Further, the connecting portion 322 of the resin member 32 is connected to the upper end of the crawler width direction side surface portion 321 of the resin member 32. As a result, the resin member 32 is partitioned between the crawler width direction side surface portion 321 and the connecting portion 322 with a region R for accommodating (filling) the elastic material portion 31 constituting the protrusion 3. In this case, a large embedded surface F (see FIG. 4F) of the resin member 32 in contact with the elastic material portion 31 is secured, and a large adhesive area between the elastic material portion 31 and the resin member 32 is secured. Thereby, according to the present embodiment, the durability of the protrusion 3 and, by extension, the durability of the elastic crawler 1A can be further improved.

Further, in the present embodiment, it is preferable that the resin member 32 has at least one of a concave portion and a convex portion on the portion in contact with the elastic material portion 31, that is, the embedded surface F. In this case, a large embedded surface F of the resin member 32 in contact with the elastic material portion 31 is secured, and a large joint area between the elastic material portion 31 and the resin member 32 is secured. As a result, the bonding force between the elastic material portion 31 and the resin member 32 is increased, and as a result, the durability of the protrusion 3 and the durability of the elastic crawler 1A can be further improved.

As shown in FIG. 4F, in the present embodiment, the portion of the resin member 32 in contact with the elastic material portion 31 is configured as the embedded surface F. In the present embodiment, the embedded surface F of the resin member 32 is composed of the inner surface F32i of the resin member 32 and the edge 325 of the crawler width direction side surface portion 321 of the resin member 32 other than the outer surface F32o of the resin member 32. ing. The ribs 323 and 324 form a part of the embedding surface F.

Further, another concave portion or convex portion may be provided on the embedded surface F of the resin member 32. Examples of the other concave portion or convex portion include a single convex portion, embossing, embossing, and the like. For example, in the present embodiment, as shown by the hatch in FIG. 4F, other concave or convex portions such as embossing can be further provided on the entire embedded surface F. In this case, the adhesion between the elastic material portion 31 and the resin member 32 is good. In particular, when the elastic material portion 31 is made of rubber, the adhesion to the resin member 32 is good. On the other hand, it is preferable that the outer surface F32o of the resin member 32 reduces the frictional resistance in consideration of contact with the rolling wheels 130 and the like. Therefore, it is preferable that the outer surface F32o of the resin member 32 is not subjected to surface roughness processing such as providing the convex portion.

Further, as shown in FIG. 5B, in the present embodiment, the crawler thickness direction edge 325 of the crawler width direction side surface portion 321 is the crawler thickness direction outer peripheral edge 325A and 325B2 arranged on the crawler outer peripheral side. Further, in the present embodiment, the outer peripheral edge 325A and 325B2 in the crawler thickness direction of the side surface portion 321 in the crawler width direction are arranged on the inner peripheral side in the crawler thickness direction with respect to the outer peripheral end 3e in the crawler thickness direction of the protrusion 3.

Here, FIG. 6 is a cross-sectional view taken along the line BB of FIG. In FIG. 6, the elastic crawler 1A is shown in a cross section shown from the crawler circumferential direction.

Referring to FIG. 6, reference numeral 3e is an outer peripheral end of the protrusion 3 in the crawler thickness direction. The outer peripheral end 3e of the protrusion 3 in the crawler thickness direction is a boundary surface between the protrusion 3 and the crawler body 2. That is, the outer peripheral end 3e of the protrusion 3 in the crawler thickness direction is the lowermost end of the protrusion 3. In the present embodiment, the outer peripheral end 3e of the protrusion 3 in the crawler thickness direction coincides with the inner peripheral surface 21 of the crawler body 2. Further, in the present embodiment, the outer peripheral end 3e of the protrusion 3 in the crawler thickness direction is a virtual coupling surface with the crawler main body 2. When the drive wheels 110 of the crawler traveling device 100 rotate, each of the pins 110P is configured to sequentially contact the crawler circumferential side surface F3c of the protrusion 3 of the elastic crawler 1A corresponding to the pin 110P.

Referring to FIG. 5A, in the present embodiment, the height H of the protrusion 3 is the height in the crawler thickness direction. In the present embodiment, the height H of the protrusion 3 is the height from the outer peripheral end 3e of the protrusion 3 in the crawler thickness direction to the top surface F3t of the protrusion 3. Further, in the present embodiment, of the crawler thickness direction edge 325 of the crawler width direction side surface portion 321 of the resin member 32, the end edge 325 on the outermost side in the crawler thickness direction is the crawler circumferential extension of the crawler width direction side surface portion 321. The crawler thickness direction outer peripheral edge 325A of the existing wall portion 321a and the crawler thickness direction outer peripheral edge 325B2 of the columnar corner wall portion 321b2 in the crawler width inner extending wall portion 321b. That is, in the present embodiment, the outer peripheral edge edges 325A and 325B2 of the crawler width direction side surface portion 321 in the crawler thickness direction are the lowermost ends of the crawler width direction side surface portion 321 of the resin member 32. In the present embodiment, the crawler thickness direction outer peripheral edge 325A and 325B2 of the crawler width direction side surface portion 321 are located at a height h (> 0) from the crawler thickness direction outer peripheral end 3e of the protrusion 3. The height h is the height in the crawler thickness direction. The height h can be appropriately set according to various requirements such as the size, shape, and required performance of the elastic crawler 1A. For example, in the present embodiment, the height h prevents the resin member 32 from directly contacting the rubber portion 133 (see FIG. 5) of the rolling wheel 130 on which the elastic crawler 1A can be mounted. The thickness of the rubber portion 133 is set higher than the thickness in the crawler thickness direction.

In the present embodiment, in the resin member 32, the outer peripheral edge 325A and 325B2 in the crawler thickness direction of the side surface portion 321 in the crawler width direction of the resin member 32 are on the inner peripheral side in the crawler thickness direction with respect to the outer peripheral end 3e in the crawler thickness direction of the protrusion 3. It is embedded in the elastic material portion 31 so as to be arranged on the upper side). In this case, since the outer peripheral end 3e of the protrusion 3 in the crawler thickness direction is originally a portion where strain is likely to be concentrated due to contact with the rolling wheel 130 or the like, the outer peripheral edge of the resin member 32 in the crawler width direction side surface portion 321 in the crawler thickness direction. When 325A and 325B2 reach the outer peripheral end 3e of the protrusion 3 in the crawler thickness direction, the strain generated near the outer peripheral end 3e of the protrusion 3 in the crawler thickness direction is further increased by the difference in rigidity generated at the interface BS between the resin member 32 and the elastic material portion 31. Although it increases, the crawler thickness direction outer peripheral edge 325A and 325B2 of the crawler width direction side surface portion 321 of the resin member 32 are arranged at positions higher than the crawler thickness direction outer peripheral end 3e of the protrusion 3, and the crawler width direction of the resin member 32. If the outer peripheral edge 325A in the crawler thickness direction of the side surface portion 321 and the outer corner portion 325a in the crawler width direction of the 325B2 are formed by a fillet, the strain generated in the vicinity of the outer peripheral edge 3e in the crawler thickness direction of the protrusion 3 is suppressed, thereby causing cracks. Durability is improved because the occurrence and its progress are more suppressed.

Next, FIG. 7 is an enlarged perspective view schematically showing the protrusion 3 of the elastic crawler 1B according to the second embodiment of the present invention. Hereinafter, the same parts as those described above will be referred to by the same reference numerals, and the description thereof will be omitted.

In the elastic crawler 1B according to the present embodiment, the top surface F3t of the protrusion 3 is composed of the top surface F322t of the connecting portion 322 of the resin member 32 and the top surface F31t of the elastic material portion 31. In the present embodiment, the connecting portions 322 of the two resin members 32 are arranged at intervals in the crawler circumferential direction. The top surface F31t of the elastic material portion 31 is interposed between the top surfaces F322t of the connecting portion 322 of the two resin members 32. Similar to the first embodiment, the top surface F322t of the connecting portion 322 of the resin member 32 and the top surface F31t of the elastic material portion 31 have no step between them, and the top surface F3t of the protrusion 3 is smoothly formed. .. In other words, also in this embodiment, the top surface F3t of the protrusion 3 is the same surface (for example, the same plane) composed of the top surface F322t of the connecting portion 322 of the resin member 32 and the top surface F31t of the elastic material portion 31. Is.

FIG. 8 is a plan perspective view schematically showing the resin member 32 forming a part of the protrusion 3 of the elastic crawler 1B. In the present embodiment, the resin member 32 includes two connecting portions 322 that connect the two crawler width direction side surface portions 321. In this case, since the rigidity of the entire resin member 32 is improved, the durability of the protrusion 3 of the elastic crawler 1B, and by extension, the durability of the elastic crawler 1B can be further improved. Further, in the present embodiment, a gap S is formed between the two connecting portions 322. In the present embodiment, in addition to the region R of the resin member 32 according to the first embodiment, the gap S functions as the region R, and a part of the elastic material portion 31 is accommodated between the gaps S. In this case, a large embedded surface F of the resin member 32 in contact with the elastic material portion 31 is secured, and a large adhesive area between the elastic material portion 31 and the resin member 32 is secured. As a result, with respect to the adhesion between the elastic material portion 31 and the resin member 32, the durability against the adhesion is increased, and as a result, the durability of the protrusion 3 of the elastic crawler 1B, and by extension, the durability of the elastic crawler 1B can be improved. ..

Further, in the present embodiment, the resin member 32 is formed by combining the crawler width direction side surface portion 321 and the connecting portion 322 of the resin member 32. Specifically, the resin member 32 has two crawler width direction side surface portions 321 and two connecting portions 322, and each of the crawler width direction side surface portion 321 and the connecting portion 322 is configured as four separate parts. There is. The crawler width direction side surface portion 321 and the connecting portion 322 of the resin member 32 can be connected by using a fixing means such as adhesion or fastening. In the present embodiment, the crawler width direction side surface portion 321 and the connecting portion 322 of the resin member 32 are connected by using a fastening element such as a bolt. However, as a modification of the present embodiment, the crawler width direction side surface portion 321 and the connecting portion 322 of the resin member 32 can be integrally molded as in the first embodiment. Alternatively, the crawler width direction side surface portion 321 and the connecting portion 322 of the resin member 32 according to the first embodiment can be assembled as individual parts as in the present embodiment.

Further, also in the elastic crawler 1B according to the present embodiment, it is preferable that the resin member 32 has at least one of a concave portion and a convex portion on the embedded surface in contact with the protrusion 3.

As shown in FIGS. 8 and 9, in the present embodiment, the resin member 32 has a recess 326 on the embedded surface F in contact with the elastic material portion 31. In the present embodiment, the recess 326 includes a first groove portion 326a and a second groove portion 326b. In the present embodiment, as shown in FIG. 9, the first groove portion 326a and the second groove portion 326b have different inclination directions from each other. As a result, in the present embodiment, the recess 326 is configured as a plurality of grid-like grooves. However, according to the present invention, the first groove portion 326a and the second groove portion 326b can be either one. Further, according to the present invention, the number of recesses 314 can be at least one.

Also in the case of the present embodiment, a large embedded surface F of the resin member 32 in contact with the elastic material portion 31 is secured, and by extension, a large joint area between the elastic material portion 31 and the resin member 32 is secured. As a result, the bonding force between the elastic material portion 31 and the resin member 32 is increased, and as a result, the durability of the protrusions 3 of the elastic crawler 1B, and by extension, the durability of the elastic crawler 1B can be improved.

According to the present invention, the recess 326 is not limited to the groove shape as in the present embodiment. Examples of the other recess 326 include a sealing hole (blind hole). Further, also in the elastic crawler 1B according to the present embodiment, a convex portion can be provided on the embedded surface F of the resin member 32. Examples of the convex portion include a single convex portion, embossing, embossing, and the like. For example, the concave portion 326 may be provided with the convex portion. When the convex portion is provided on the embedded surface F of the resin member 32 such as the concave portion 326, the adhesion between the elastic material portion 31 and the resin member 32 becomes good as in the elastic crawler 1A. In particular, when the elastic material portion 31 is made of rubber, the adhesion to the resin member 32 is good. On the other hand, it is preferable that the outer surface F32o of the resin member 32 also reduces the frictional resistance in consideration of contact with the rolling wheels 130 and the like, like the elastic crawler 1A. Therefore, also in the present embodiment, it is preferable not to perform surface roughness processing such as providing the convex portion on the outer surface F32o of the resin member 32 as in the elastic crawler 1A.

The above has only disclosed some embodiments of the present invention, and various modifications can be made according to the claims. For example, in the present embodiment, as shown in FIG. 4F, the crawler width direction outer corner portion 325a and the crawler width direction inner corner portion 325b are rounded on the entire edge 325 of the crawler width direction side surface portion 321 of the resin member 32. Although it has a flat shape (fillet) and the intermediate portion 325c is a flat portion, at least the crawler thickness of the crawler width direction side surface portion 321 of the resin member 32 excluding the edge 325B1 of the crawler width direction extending wall portion 321b1. Only the directional outer peripheral edge 325A and 325B2 can be used. Further, according to the present invention, in the crawler width direction side surface portion 321 of the resin member 32, the crawler width direction side surface portion 321 omits the crawler width direction inner extending wall portion 321b, and the crawler circumferential direction extending wall portion 321a is omitted. Can only be. Further, according to the present invention, the resin member 32 can be composed of only the side surface portion 321 in the crawler width direction. In this case, of the end edge 325 of the side surface portion 321 in the crawler width direction of the resin member 32, at least one of the outer peripheral side edge in the crawler thickness direction and the inner peripheral side (upper side) in the crawler thickness direction may be formed as described above. it can.

A part of the resin member 32, another part, and the like can be separated. In the present embodiment, the resin member 32 integrally comprises the crawler width direction side surface portion 321 and the connecting portion 322 of the resin member 32, but each of them may also be composed of individual members. Further, the connecting portion 322 of the resin member 32 may be incorporated in the elastic material portion 31. In this case, the connecting portion 322 of the resin member 32 is not exposed to the elastic material portion 31. Further, according to the present invention, the crawler width direction inner side wall portion 321b of the crawler width direction side surface portion 321 of the resin member 32 can be omitted. The various configurations adopted in each of the above-described embodiments can be used in combination with each other. In addition, the various configurations adopted in each of the above-described embodiments can be appropriately replaced with each other.

1A: Elastic crawler (first embodiment), 1B: Elastic crawler (second embodiment) 2: Crawler body, 12: Inner peripheral surface of crawler body, 3: Projection, 3e: Outer peripheral edge of protrusion in crawler thickness direction, 4; lug, 32: resin member, 321: crawler width direction side surface part of resin member, 321a: crawler circumferential extension wall part, 321b: crawler width direction inner extension wall part (wall part), 322: resin member Connecting part, 323: Rib, 324: Rib, 325: Crawler width direction side surface edge, 325A: Crawler width direction side surface crawler thickness direction outer peripheral edge, 325B2: Crawler width direction side surface crawler thickness direction outer edge Edge, 325a: outer corner in crawler width direction, 325b: inner corner in crawler width direction, 325c: middle part (flat part), F321o: outer surface of side surface in crawler width direction, F321i: inner surface of side surface in crawler width direction , BS: Interface, F: Embedded surface of resin member, 100: Crawler traveling device, 110: Drive wheel (rotating body), 110P: Pin, 120: Driven wheel (rotating body), 130: Rolling wheel (rotating body)

Claims (8)

The crawler body, which is shaped like an endless band and is made of elastic material,
It is provided with a plurality of protrusions arranged at intervals on the inner peripheral surface of the crawler body.
The protrusion includes an elastic material portion and a resin member.
The resin member includes a side surface portion in the crawler width direction.
The crawler width direction side surface portion has a crawler thickness direction edge that forms an interface with the elastic material portion.
The outer corner portion in the crawler width direction of the edge in the crawler thickness direction has a rounded shape from the outer surface of the side surface portion in the crawler width direction toward the inner surface of the side surface portion in the crawler width direction in a cross-sectional view in the crawler width direction. It becomes an elastic crawler. The crawler thickness direction edge of the crawler width direction side surface portion is continuous with the crawler width direction outer corner portion and extends flatly toward the inner surface of the crawler width direction side surface portion in a crawler width direction cross-sectional view. The elastic crawler according to claim 1, which has a flat portion. At the crawler thickness direction edge of the crawler width direction side surface portion, the crawler width direction inner corner portion of the crawler thickness direction end edge is the crawler from the inner surface of the crawler width direction side surface portion in the crawler width direction cross-sectional view. The elastic crawler according to claim 1 or 2, which has a shape rounded toward the outer surface of the side surface portion in the width direction. The elastic crawler according to any one of claims 1 to 3, wherein the side surface portion in the crawler width direction includes a wall portion extending inward in the crawler width direction. The elastic crawler according to any one of claims 1 to 4, wherein the crawler width direction side surface portion is exposed on the crawler width direction side surface portion of the elastic material portion. The resin member includes two side surfaces in the crawler width direction arranged so as to face each other in the crawler width direction.
The resin member further includes at least one connecting portion that connects the two crawler width direction side surface portions.
The elastic crawler according to any one of claims 1 to 5, wherein the protruding portion excluding the two crawler width direction side surface portions and the connecting portion is formed by the elastic material portion. The elastic crawler according to any one of claims 1 to 6, wherein the resin member has at least one of a concave portion and a convex portion in a portion in contact with the elastic material portion. The crawler thickness direction edge of the side surface portion in the crawler width direction is an outer peripheral edge in the crawler thickness direction arranged on the crawler outer peripheral side.
The aspect according to any one of claims 1 to 7, wherein the outer peripheral edge in the crawler thickness direction of the side surface portion in the crawler width direction is arranged on the inner peripheral side in the crawler thickness direction with respect to the outer peripheral edge in the crawler thickness direction of the protrusion. Elastic crawler.

Images