JP2021017170A - Core member for elastic crawler, elastic crawler, and manufacturing method of core member for elastic crawler - Google Patents

Abstract

To provide a core member for an elastic crawler and the elastic crawler which achieve weight reduction and high durability, and to provide a manufacturing method of the core member for the elastic crawler which can obtain the core member for the elastic crawler easily.SOLUTION: A core member 1A includes a substrate 2 and two projections 3. Further, the core member 1A comprises: a body 4 made of a resin; and a metal plate 5 which covers the body 4. The metal plate 5 forms at least one of one side surface f1, a projection inner surface f2, a projection top surface f3, and a projection outer surface f4. An elastic crawler 10 includes the core member 1A and a body 20. The elastic crawler 10 is formed by injection molding the body 20 with the metal plate 5 used as an insert product.SELECTED DRAWING: Figure 1

Description

The present invention relates to an elastic crawler core member, an elastic crawler, and a method for manufacturing an elastic crawler core member.

Some conventional core members for elastic crawlers are made of polyketone resin (see, for example, Patent Document 1). According to this conventional elastic crawler core member, weight reduction can be achieved while ensuring mechanical properties such as wear resistance.

JP-A-2007-210446

However, the conventional elastic crawler core member described above is made of only resin. For this reason, there is still room for improvement in durability of the conventional core member for elastic crawlers.

An object of the present invention is to provide a core member for an elastic crawler and an elastic crawler, which are both lightweight and durable, and elastic, which is both lightweight and durable. It is an object of the present invention to provide a method for manufacturing an elastic crawler core member, which can easily obtain a crawler core member.

The elastic crawler core member according to the present invention is an elastic crawler core member used for an elastic crawler, and the elastic crawler core member protrudes from one side surface of the substrate and the substrate and of the substrate. It is provided with two protrusions arranged at intervals in the longitudinal direction, and the elastic crawler core member includes a core member main body made of resin, a metal plate covering the core member main body, and the like. The metal plate is formed by at least one of the one side surface of the substrate between the two protrusions, the inner surface of the protrusions, the top surface of the protrusions, and the outer surface of the protrusions. Consists of. According to the elastic crawler core member according to the present invention, both weight reduction and durability can be achieved.

In the elastic crawler core member according to the present invention, it is preferable that the metal plate constitutes the one-sided surface of the substrate between the two protrusions. In this case, the durability can be effectively improved.

In the elastic crawler core member according to the present invention, the metal plate is arranged with respect to the elastic crawler core member with reference to the longitudinal center line of the elastic crawler core member, and the metal plate The longitudinal end is preferably arranged at a position separated from the longitudinal center line of the elastic crawler core member by a distance of 25% or more of the longitudinal dimension of the elastic crawler core member. In this case, the one side surface of the substrate between the two protrusions, the inner surface of the protrusions, the top surface of the protrusions, and the outer surface of the protrusions can all be formed of the metal plate.

In the elastic crawler core member according to the present invention, the metal plate is formed on the one side surface of the substrate between the two protrusions, the inner surface of the protrusions, the top surface of the protrusions, and the outer surface of the protrusions. It constitutes at least any two, and the thickness of the portion constituting at least one of them can be made thicker than the other portions. In this case, the desired portion can be effectively improved.

In the elastic crawler core member according to the present invention, the resin may be an amide-based resin or a ketone-based resin. In this case, by using a general-purpose resin, the elastic crawler core member according to the present invention can be provided at low cost.

In the elastic crawler core member according to the present invention, it is preferable that the metal plate has fine irregularities on the mating surface with the core member main body. In this case, the core member main body and the metal plate are firmly fixed, so that the core member for an elastic crawler has more excellent durability.

The elastic crawler according to the present invention includes an elastic endless band-shaped crawler body and the above-mentioned elastic crawler core member embedded in the crawler body and arranged at intervals in the circumferential direction. .. According to the elastic crawler according to the present invention, both weight reduction and durability can be achieved.

The method for manufacturing an elastic crawler core member according to the present invention is a method for manufacturing any of the above-mentioned crawler core members, and the core member main body is injection-molded using the metal plate as an insert product. According to the method for manufacturing an elastic crawler core member according to the present invention, it is possible to easily obtain an elastic crawler core member that is both lightweight and durable.

According to the present invention, it is possible to provide a core member for an elastic crawler that is both lightweight and durable. Further, according to the present invention, it is possible to provide an elastic crawler that is both lightweight and durable. Further, according to the present invention, it is possible to provide a method for manufacturing an elastic crawler core member, which can easily obtain an elastic crawler core member while achieving both weight reduction and durability.

It is a perspective view which shows the elastic crawler of one Embodiment which concerns on this invention in a partly cross section in the state which is attached to the airframe. It is a perspective view which shows typically the elastic crawler core member of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the elastic crawler core member of FIG. 2 in the cross section from the AA direction. FIG. 3A is a cross-sectional view taken along the line BB of FIG. 3A. It is an example of the metal plate of the elastic crawler core member according to this invention, and is the perspective view of the metal plate of the elastic crawler core member of FIG. It is a perspective view which shows typically the elastic crawler core member of the 2nd Embodiment which concerns on this invention. It is sectional drawing which shows the elastic crawler core member of FIG. 5 in the cross section from the AA direction. 6A is a cross-sectional view taken along the line BB of FIG. 6A. It is an example of the metal plate of the elastic crawler core member according to this invention, and is the perspective view of the metal plate of the elastic crawler core member of FIG.

Hereinafter, various embodiments according to the present invention will be described with reference to the drawings.

FIG. 1 shows a partial cross section of the elastic crawler 10 of the embodiment according to the present invention in a state of being attached to the airframe. In the following description, the "circumferential direction" refers to the circumferential direction of the elastic crawler. Further, the "width direction" means the width direction of the elastic crawler. Further, the "diameter direction" refers to the radial direction of the elastic crawler.

The elastic crawler 10 includes an elastic endless band-shaped crawler main body 20 and an elastic crawler core member 1A embedded in the crawler main body 20 and arranged at intervals in the circumferential direction.

The elastic crawler 10 includes a plurality of meshing portions 21 that mesh with the teeth 41 of the drive sprocket 40 attached to the airframe. Each of the plurality of meshing portions 21 protrudes from the inner peripheral surface of the elastic crawler 10 and is arranged at intervals in the circumferential direction. As a result, when the drive sprocket 40 rotates, the teeth 41 of the drive sprocket 40 sequentially mesh with the meshing portion 21 of the elastic crawler 10, so that the elastic crawler 10 can be rotated in the circumferential direction.

In the present embodiment, the meshing portion 21 is arranged at the center of the elastic crawler 10 in the width direction. Further, a rolling wheel rolling surface 22 for rolling the rolling wheel 50 attached to the machine body is provided on the inner peripheral surface of the elastic crawler 10. The rotary press rolling surface 22 extends in an endless shape (annular shape) in the circumferential direction. As a result, the elastic crawler 10 can rotate in the circumferential direction with the rolling wheel 50 as a support ring.

In the present embodiment, the wheel 50 includes two wheel bodies 51. Further, the elastic crawler 10 includes two rotary presses 22. The two rotary presses 22 are arranged at intervals in the width direction, and the two rotary presses 22 are respectively arranged outside the meshing portion 21 in the width direction.

Further, the elastic crawler 10 includes a plurality of guide protrusions 23. Each of the plurality of guide protrusions 23 protrudes from the inner peripheral surface of the crawler main body 20 and is arranged at intervals in the circumferential direction. In the present embodiment, the guide protrusion 23 is arranged outside the meshing portion 21 in the width direction, and is arranged between the meshing portion 21 and the rotary wheel rolling surface 22. In the present embodiment, the guide protrusion 23 can be brought into contact with the rolling wheel 50 (rolling wheel main body 51) when the rolling wheel 50 moves in the width direction. That is, in the present embodiment, the guide protrusion 23 guides the rolling wheel 50 in the circumferential direction. In the present embodiment, the guide protrusion 23 can also be brought into contact with the drive sprocket 40 when the drive sprocket 40 moves in the width direction. That is, in the present embodiment, the guide protrusion 23 can also guide the drive sprocket 40 in the circumferential direction.

Further, the elastic crawler 10 is provided with a plurality of lugs 24 on the outer peripheral surface of the crawler body 20. The plurality of lugs 24 project from the outer peripheral surface of the crawler main body 20 and are arranged at intervals in the circumferential direction. The lug 24 improves the driving performance and braking performance of the elastic crawler 10.

The elastic crawler core member 1A is embedded in the crawler body 20 together with the reinforcing layer 60. The reinforcing layer 60 is made of a steel cord 61 or the like extending over the entire circumference. In the present embodiment, the reinforcing layer 60 is arranged on the outer side (outer peripheral side) in the radial direction with respect to the elastic crawler core member 1A.

FIG. 2 shows the elastic crawler core member 1A used for the elastic crawler 10. The elastic crawler core member 1A according to the present embodiment has a rectangular shape. As shown in FIG. 2, the elastic crawler core member 1A extends in the longitudinal direction and extends in the lateral direction. In the present embodiment, the elastic crawler core member 1A is embedded in the crawler body 20 so that its longitudinal direction extends in the width direction and its lateral direction extends in the circumferential direction. Further, FIG. 3A shows the elastic crawler core member 1A in cross section from the AA direction.

As shown in FIG. 3A, the elastic crawler core member 1A protrudes from the substrate 2 and one side surface 2f of the substrate 2, and two protrusions 3 are arranged at intervals in the longitudinal direction of the substrate 2. And have.

Further, the elastic crawler core member 1A is composed of a core member main body 4 made of resin and a metal plate 5 that covers the core member main body 4.

Examples of the resin include thermoplastic resins. The thermoplastic resin can be one or more selected from the group consisting of amide resins, for example, aliphatic polyamides (nylon) and aromatic polyamides (aramid). Further, the resin may contain, for example, glass fiber or the like. Specific examples of the resin include 66 nylon resin containing 40 to 50% of glass fiber. Further, the resin may be a ketone resin, for example, a polyketone resin. However, the resin is not limited to the above-mentioned resin.

The metal plate 5 can be formed of, for example, a metal for casting, a metal for forging, or a metal for pressing. Specific examples of the metal forming the metal plate 5 include aluminum alloys, cast iron, carbon steel, stainless steel and the like. In the case of an aluminum alloy, it is effective in reducing the weight of the elastic crawler core member 1A. However, the metal is not limited to the above-mentioned metal.

The metal plate 5 has a one-sided surface 2f of the substrate 2 between the two protrusions 3 (hereinafter, also referred to as “inter-projection surface f1”) and an inner surface of the protrusion 3 (hereinafter, also referred to as “projection inner surface”). At least one of f2, the top surface of the protrusion 3 (hereinafter, also referred to as “protrusion top surface”) f3, and the outer surface of the protrusion 3 (hereinafter, also referred to as “protrusion outer surface”) f4 is configured. There is.

In the present embodiment, the metal plate 5 includes an inter-projection surface portion 5a constituting the inter-projection surface f1, a projection inner side surface portion 5b forming the projection inner side surface f2, and a projection top surface portion 5c forming the protrusion top surface f3. The protrusion outer surface portion 5d constituting the protrusion outer surface f4 is provided. In the present embodiment, the inter-projection surface portion 5a, the protrusion inner side surface portion 5b, the protrusion top surface portion 5c, and the protrusion outer surface portion 5d each have a plate-like shape. More specifically, the metal plate 5 includes one inter-projection surface portion 5a, two projection inner side surface portions 5b, two projection top surface portions 5c, and two projection outer surface portions 5d. In the present embodiment, one inter-projection surface portion 5a, two projection inner side surface portions 5b, two projection top surface portions 5c, and two projection outer surface portions 5d are integrally formed. In other words, the metal plate 5 constitutes a surface layer portion of the two protrusions 3 and a surface layer portion of the substrate 2 between the two protrusions 3. That is, in the present embodiment, all of one inter-projection surface f1, two projection inner surface f2, two projection top surfaces f3, and two projection outer surfaces f4 are formed on the surface of the metal plate 5.

The inter-projection surface f1, the projection inner surface f2, the projection top surface f3, and the protrusion outer surface f4 of the elastic crawler core member may all be worn due to interference with the drive sprocket 40 and the rolling wheels 50.

The inter-projection surface f1 of the elastic crawler core member forms the meshing portion 21 of the elastic crawler 10. Therefore, there is a possibility that wear may occur due to interference of the tips of the teeth 41 of the drive sprocket 40 and the like.

Further, the protrusion 3 of the core member for the elastic crawler forms the guide protrusion 23 of the elastic crawler 10. Therefore, the protrusion inner surface f2 of the elastic crawler core member may be worn because the side surface of the drive sprocket 40 interferes with the inner surface of the guide protrusion 23. Further, the protrusion top surface f3 of the elastic crawler core member may be worn when the rolling wheel 50 (rolling wheel main body 51) unintentionally rides on (overcomes) the guide protrusion 23. Further, the protrusion outer surface f4 of the elastic crawler core member may be worn because the inner side surface of the rolling wheel 50 (rolling wheel main body 51) interferes with the outer surface of the guide protrusion 23.

Further, since the elastic crawler core member is heavy in weight, it is required to have excellent load-bearing performance (performance that can withstand the load required for traveling / working of the airframe), that is, to have high strength.

On the other hand, the elastic crawler core member 1A according to the present embodiment is composed of a core member main body 4 made of resin and a metal plate 5 covering the core member main body 4. According to the present embodiment, since a part of the elastic crawler core member 1A is made of resin, the elastic crawler core member is compared with the case where a core metal made of only metal is used as the elastic crawler core member. The weight of the entire 1A can be reduced. Further, according to the present embodiment, by coating the core member main body 4 with the metal plate 5, the drive sprocket 40 or the like is harder than the case where the core member made of only resin is used as the core member for the elastic crawler. Wear caused by interference of members can be suppressed. In addition, metal is superior in strength to resin. As described above, according to the elastic crawler core member 1A according to the present embodiment, as compared with the core member formed only of resin, the durability and strength are improved, and the weight reduction and the durability are compatible. Be done.

Therefore, according to the present embodiment, it is possible to provide the elastic crawler core member 1A in which both weight reduction and durability are achieved.

FIG. 3B is a sectional view taken along the line BB of FIG. 3A. As shown in FIG. 3B, in the elastic crawler core member 1A according to the present embodiment, the lateral end edge portion 5a1 of the inter-projection surface portion 5a is a cross-sectional view when viewed from the longitudinal direction as shown in FIG. 3B. It is composed of a curved surface f11 formed by a curved contour line. The curved surface f11 is a portion that meshes with the teeth 41 of the drive sprocket 40. That is, as described above, the inter-projection surface f1 of the elastic crawler core member 1A is a portion that easily interferes with the teeth 41 of the drive sprocket 40.

In the present embodiment, the metal plate 5 constitutes the inter-projection surface f1 of the elastic crawler core member 1A. In this case, it is possible to reinforce the portion that is likely to be worn due to interference with the drive sprocket 40. Therefore, according to the present embodiment, the durability can be effectively improved.

According to the present invention, the metal plate 5 may constitute at least one of the inter-projection surface f1, the protrusion inner side surface f2, the protrusion top surface f3, and the protrusion outer surface f4. However, according to the present invention, the metal plate 5 constitutes one inter-projection surface f1, two projection inner surface f2, two projection top surfaces f3, and two projection outer surfaces f4, as in the present embodiment. Is preferable.

In the elastic crawler core member 1A according to the present embodiment, the metal plate 5 constitutes all of one inter-projection surface f1, two projection inner surface f2, two projection top surfaces f3, and two projection outer surfaces f4. ing. Therefore, according to the elastic crawler core member 1A according to the present embodiment, the durability can be improved most effectively.

By the way, in FIG. 3A, reference numeral L1 is the extending length of the elastic crawler core member 1A in the longitudinal direction. In the present embodiment, the longitudinal extension length L1 of the elastic crawler core member 1A is the longitudinal length between the two longitudinal ends 1e of the elastic crawler core member 1A. In the present embodiment, the length between the two longitudinal ends 1e of the elastic crawler core member 1A is equal to the length between the two longitudinal ends 1e of the substrate 2. That is, in the present embodiment, the longitudinal extending length L1 of the elastic crawler core member 1A is equal to the longitudinal extending length of the substrate 2.

Further, in FIG. 3A, reference numeral L5 is the extending length of the metal plate 5 in the longitudinal direction. In the present embodiment, the extending length of the metal plate 5 in the longitudinal direction of the elastic crawler core member 1A (hereinafter, also referred to as “longitudinal extending length of the metal plate 5”) L5 is the metal plate 5. The length between the two longitudinal ends 5e. In this embodiment, the length between the two longitudinal ends e1 of the metal plate 5 is equal to the length between the outer root ends 3e of the two protrusions 3. That is, in the present embodiment, the longitudinal extending length L5 of the metal plate 5 is equal to the length between the outer root ends 3e of the two protrusions 3.

Here, in the present embodiment, the metal plate 5 is arranged with respect to the elastic crawler core member with reference to the longitudinal center line O1 of the elastic crawler core member 1A, and the end in the longitudinal direction of the metal plate 5. 5e is a distance of 25% or more of the longitudinal dimension (longitudinal extending length of the elastic crawler core member 1A) L1 of the elastic crawler core member 1A from the longitudinal center line O1 of the elastic crawler core member 1A. It is placed only at a distance.

In a general elastic crawler core member, the outer root end 3e of the protrusion 3 is a distance of approximately 25% of the longitudinal dimension L1 of the elastic crawler core member from the longitudinal center line O1 of the elastic crawler core member. It is placed only at a distance.

Therefore, in the present embodiment, the metal plate 5 is attached to the elastic crawler core member 1A so that the longitudinal center line O5 of the metal plate 5 coincides with the position of the longitudinal center line O1 of the elastic crawler core member 1A. When arranged, the longitudinal end 5e of the metal plate 5 is located at a distance of 25% or more of the longitudinal dimension L1 of the elastic crawler core member 1A from the longitudinal center line O1 of the elastic crawler core member 1A. Is located in.

In this case, as shown in FIG. 3A, the metal plate 5 is elastic by a simple method of setting the position of the longitudinal end 5e of the metal plate 5 with reference to the longitudinal center line O1 of the elastic crawler core member 1A. In the longitudinal direction of the crawler core member 1A, all of one inter-projection surface f1, two projection inner surface f2, two projection top surfaces f3, and two projection outer surfaces f4 can be formed.

In the present embodiment, the outer root end 3e of the protrusion 3 is a portion between the two protrusions 3 of the elastic crawler core member 1A (hereinafter, also referred to as a “core member protrusion inter-projection portion”) 2a and an elastic crawler core. A wing portion (hereinafter, “core member wing portion”) 2b of the elastic crawler core member 1A, which is outside the width direction of the core member protrusion portion 2a of the member 1A, is defined.

Further, as shown in FIG. 3A, in the present embodiment, the "outer root end 3e of the protrusion 3" is the longitudinal end of the substrate 2 (the longitudinal end 1e of the elastic crawler core member 1A) in the lateral view. ), Which extends inward in the width direction and is the intersection P of the contour line L2 when drawing the one-side surface 2f of the substrate 2 and the contour line L3 when drawing the outer surface f4 of the protrusion 3. ..

By the way, in the elastic crawler core member 1A according to the present embodiment, the metal plate 5 has a thickness of a portion constituting any one of the inter-projection surface f1, the projection inner side surface f2, the projection top surface f3, and the protrusion outer surface f4. The t can be thicker than the other parts. In this case, the desired portion can be effectively improved.

As shown in FIG. 3A, in the present embodiment, the metal plate 5 has the thickness t of the inter-projection surface portion 5a, the projection inner surface portion 5b, the protrusion top surface portion 5c, and the protrusion outer surface portion 5d, respectively, t1, t2, t3, and Let it be t4. In the present embodiment, with an emphasis on unintentional riding (overcoming) of the rolling wheels 50, the thickness t1 of the interprojection surface portion 5a, the thickness t3 of the projection top surface portion 5b, the thickness t2 of the protrusion inner side surface portion 5c, and It is thicker than the thickness t4 of the protrusion outer surface portion 5d. However, the change in the thickness t of the metal plate 5 is not limited to this. For example, in the metal plate 5, the thickness t1 of the inter-projection surface portion 5a may be made thicker than the thickness t2 of the protrusion inner side surface portion 5b, the thickness t3 of the protrusion top surface portion 5c, and the thickness t4 of the protrusion outer surface portion 5d. it can.

Further, according to the present invention, the metal plate 5 has a thickness t1 of the inter-projection surface portion 5a, a thickness t2 of the protrusion inner side surface portion 5b, a thickness t3 of the protrusion top surface portion 5c, and a thickness t4 of the protrusion outer surface portion 5d. Can be of equal thickness. That is, according to the present invention, the thickness t1 of the metal plate 5 can be made equal along the longitudinal direction. In this case, for example, the metal plate 5 can be easily manufactured by press working.

Further, as described above, in the present embodiment, the resin constituting the core member main body 4 may be an amide-based resin or a ketone-based resin. In this case, by using a general-purpose resin, the elastic crawler core member 1A can be provided at low cost.

FIG. 4 is an example of a metal plate of the elastic crawler core member according to the present invention, and is a perspective view of the metal plate 5 of the elastic crawler core member 1A.

As shown in FIG. 4, in the present embodiment, the metal plate 5 has a fine unevenness 5r on the mating surface f7 with the core member main body 4. As will be described later, in the elastic crawler core member 1A, the core member main body 4 can be injection-molded using the metal plate 5 as an insert product. In this case, if the metal plate 5 is provided with fine irregularities (hereinafter, also referred to as “fine irregularities”) 5r, the crimping force between the core member main body 4 and the metal plate 5 is increased by the anchor effect of the fine irregularities 5r. Can be made to. Therefore, the core member main body 4 and the metal plate 5 are firmly fixed. As a result, the elastic crawler core member 1A becomes an elastic crawler core member having more excellent durability.

The fine unevenness 5r can be formed, for example, by performing polishing, cutting, or chemical treatment on the mating surface f7 of the metal plate 5. Specific examples include etching processing, blasting processing, honing processing and the like.

The elastic crawler core member 1A can be manufactured by various methods. For example, the elastic crawler core member 1A can be manufactured by forming the core member main body 4 and the metal plate 5 separately and assembling them.

On the other hand, in the method for manufacturing an elastic crawler core member according to the present embodiment, the elastic crawler core member 1A can be obtained by injection molding the core member main body 4 using the metal plate 5 as an insert product. .. As a result, it is possible to obtain the elastic crawler core member 1A, which is both lightweight and durable. Therefore, according to the method for manufacturing an elastic crawler core member according to the present embodiment, an elastic crawler core member 1A having both weight reduction and durability can be easily obtained for an elastic crawler. A method for manufacturing a core member can be provided.

Specifically, the metal plate 5 of FIG. 4 is prepared. The metal plate 5 can be formed, for example, by forging, casting, pressing, extruding, or drawing with a metal material. Next, the metal plate 5 is placed as an insert product at a predetermined position in the cavity in the molding die. After that, the cavity in the molding die is injection-filled with a thermoplastic resin that is a raw material of the core member main body 4, and the core member main body 4 is injection-molded. As a result, it is possible to obtain the elastic crawler core member 1A, which is both lightweight and durable. In the present embodiment, the metal plate 5 and the core member main body 4 can be easily fixed by welding the core member main body 4 to the metal plate 5. In particular, in the present embodiment, the metal plate 5 and the core member main body 4 can be more firmly fixed by the anchor effect of the fine unevenness 5r of the metal plate 5. According to the present invention, an adhesive can be used between the metal plate 5 and the core member main body 4. In the present embodiment, for example, an adhesive can be applied to the mating surface f7 of the metal plate 5.

FIG. 1 shows an elastic crawler 10 according to this embodiment. The elastic crawler 10 includes an elastic endless band-shaped crawler body 20 and the elastic crawler core member 1A embedded in the crawler body 20 and arranged at intervals in the circumferential direction. According to the elastic crawler 10 according to the present embodiment, as compared with the elastic crawler provided with the core member formed only of resin, both weight reduction and durability can be achieved while improving durability and strength. Therefore, according to the present embodiment, it is possible to provide the elastic crawler 10 in which both weight reduction and durability are achieved.

FIG. 5 shows another elastic crawler core member 1B used for the elastic crawler 10. The elastic crawler core member 1B is the elastic crawler core member of the second embodiment according to the present invention. In the following description, substantially the same parts as those described above will be omitted by using the same reference numerals.

FIG. 6A shows the elastic crawler core member 1B in cross section from the direction AA. 6B is a cross-sectional view taken along the line BB of FIG. 6A.

According to the present invention, the longitudinal extending length L5 of the metal plate 5 can be longer than the length between the outer root ends 3e of the two protrusions 3. In the present embodiment, the longitudinal extending length L5 of the metal plate 5 extends beyond the length between the outer root ends 3e of the two protrusions 3 to the blade portion 2b of the elastic crawler core member 1B. Exists. In the present embodiment, the metal plate 5 constitutes one side surface (blade portion surface) f5 of the blade portion 2b of the substrate 2. In the present embodiment, the metal plate 5 includes a blade portion surface portion 5f constituting the blade portion surface f5, in addition to the protrusion inner side surface portion 5b, the protrusion top surface portion 5c, and the protrusion outer surface portion 5d. In the present embodiment, the inter-projection surface portion 5a, the protrusion inner side surface portion 5b, the protrusion top surface portion 5c, the protrusion outer surface portion 5d, and the wing portion surface portion 5f are integrally formed. In this case, since the wear resistance and strength of the blade portion surface portion f5 of the metal plate 5 are improved, the elastic crawler core member has more excellent durability. According to the present invention, for example, the longitudinal extending length L5 of the metal plate 5 can be the longitudinal extending length L1 of the elastic crawler core member 1A. Further, the metal plate 5 constitutes any one of the inter-projection surface f1 of the substrate 2, the inner surface f2 of the projection 3, the top surface f3 of the projection 3, the outer surface f4 of the projection 3, and the inner peripheral surface f5 of the wing portion. The thickness t of the portion, that is, the thickness t1 of the inner side surface portion 5b of the protrusion, the thickness t2 of the inner side surface portion 5b of the protrusion, the thickness t3 of the top surface portion 5c of the protrusion, the thickness t4 of the outer surface portion 5d of the protrusion, and the thickness of the surface f5 of the wing portion. The thickness of any of t5 can be thicker than the other parts.

FIG. 7 is an example of a metal plate of the elastic crawler core member according to the present invention, and is a perspective view of the metal plate 5 of the elastic crawler core member 1B.

As shown in FIG. 7, in the present embodiment, the metal plate 5 has a fine unevenness 5r on the mating surface f7 with the core member main body 4, similarly to the elastic crawler core member 1A. In this case, similarly to the elastic crawler core member 1A, the core member main body 4 and the metal plate 5 are firmly fixed by the anchor effect of the fine unevenness 5r. As a result, the elastic crawler core member 1B also becomes an elastic crawler core member having more excellent durability.

The elastic crawler core member 1B can also be manufactured by various methods like the elastic crawler core member 1A. For example, the core member 1B for an elastic crawler can be obtained by injection molding the core member main body 4 using the metal plate 5 of FIG. 7 as an insert product.

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 above-mentioned metal plate 5, the inter-projection surface portion 5a has a shape in which the length in the lateral direction is shorter (wider) than other portions such as the protrusion inner side surface portion 5b, but is limited to this. is not it. For example, the length (width) of the inter-projection surface portion 5a in the lateral direction can be the same as other portions such as the protrusion inner side surface portion 5b. 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 core member (first embodiment), 1B: Elastic crawler core member (second embodiment), 1e: Longitudinal end of elastic crawler core member, 2: Substrate, 3: Protrusion, 3e: Outer root end of protrusion 3, 4: Core member body, 5: Metal plate, 5a: Surface between protrusions, 5b: Inner side surface of protrusion, 5c: Top surface of protrusion, 5d: Outer surface of protrusion, f5: Surface of wing 5r: Fine unevenness (fine unevenness), 5e: Longitudinal end of metal plate, 10: Elastic crawler, 20: Crawler body, 21: Mating part, 22: Rolling wheel rolling surface, 23: Guide protrusion, 24: Lag, 40: Sprocket, 41: Sprocket teeth, 50: Rolling wheel, 51: Rolling wheel body, 60: Reinforcing layer, 61: Steel cord, f1: Inter-projection surface (one side surface of substrate 2 between two projections 3) ), F2: Inner surface of protrusion (inner side surface of protrusion 3), f3: Top surface of protrusion (top surface of protrusion 3), f4: Outer surface of protrusion (outer surface of protrusion 3), f5: Surface of wing part, L1: Elasticity Longitudinal extension length of crawler core member, L5: Longitudinal extension length of metal plate, O1: Longitudinal centerline of elastic crawler core member, O5: Longitudinal centerline of metal plate, t: Metal Plate thickness, t1: Thickness of surface between protrusions, t3; Thickness of top surface of protrusions, t2: Thickness of inner side surface of protrusions, t4: Thickness of outer surface of protrusions, t5: Thickness of inner peripheral surface of blades thickness

Claims (8)

An elastic crawler core member used for elastic crawlers.
The elastic crawler core member includes a substrate and two protrusions that protrude from one side surface of the substrate and are arranged at intervals in the longitudinal direction of the substrate.
Further, the elastic crawler core member is composed of a core member main body made of resin and a metal plate covering the core member main body.
The metal plate constitutes at least one of the one side surface of the substrate between the two protrusions, the inner surface of the protrusions, the top surface of the protrusions, and the outer surface of the protrusions. Core member for elastic crawlers. The core member for an elastic crawler according to claim 1, wherein the metal plate constitutes the one-sided surface of the substrate between the two protrusions. The metal plate is arranged with respect to the elastic crawler core member with reference to the longitudinal center line of the elastic crawler core member, and the longitudinal end of the metal plate is the elastic crawler core member. The elastic crawler core according to any one of claims 1 or 2, which is arranged at a position separated from the longitudinal center line of the above by a distance of 25% or more of the longitudinal dimension of the elastic crawler core member. Element. The metal plate constitutes at least one of the one side surface of the substrate between the two protrusions, the inner surface of the protrusions, the top surface of the protrusions, and the outer surface of the protrusions.
The core member for an elastic crawler according to any one of claims 1 to 3, wherein the thickness of a portion constituting at least one of them is thicker than that of the other portion. The core member for an elastic crawler according to any one of claims 1 to 4, wherein the resin is an amide-based resin or a ketone-based resin. The core member for an elastic crawler according to any one of claims 1 to 5, wherein the metal plate has fine irregularities on the mating surface with the core member main body. The elastic crawler core member according to any one of claims 1 to 6, wherein the crawler body has an elastic endless band shape, and is embedded in the crawler body and arranged at intervals in the circumferential direction. , With elastic crawlers. A method of an elastic crawler core member for manufacturing the elastic crawler core member according to any one of claims 1 to 7.
A method for manufacturing an elastic crawler core member, in which the core member body is injection-molded using the metal plate as an insert product.

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