JP5832791B2 - Crawler mandrel, elastic crawler - Google Patents

Description

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

  The tip of the crawler core bar described in Patent Document 1 has a substantially hemispherical shape with a thick plate thickness in order to prevent cracking of the rubber (elastic body).

JP 2008-230330 A

  However, in the conventional configuration, the thickness of the entire tip of the crawler core is increased, which increases the weight of the crawler core.

  The subject of this invention is suppressing the distortion of the elastic body which arises at the time of driving | running | working of a crawler vehicle, after suppressing the weight increase of the core metal for crawlers.

A metal core for a crawler according to claim 1 of the present invention is provided inside an endless belt-like elastic body that is wound around a drive wheel and a roller, extends in the width direction of the elastic body, and extends in the circumferential direction of the elastic body. A plurality of core metal bases disposed on the base metal base , a base central part located in a central part in the width direction of the core metal base, a wing part extending in the width direction of the elastic body from the central part of the base, and the wing part And the thickness of the elastic body in the plate thickness direction is increased with respect to the connecting portion provided in between, and the outer periphery of the elastic body with respect to the connecting portion. And a pair of rib portions provided so as to protrude in the width direction with respect to the connecting portion.

  According to the said structure, the contact area of the metal core base | substrate and an elastic body in the front end side of a wing | blade part spreads by making a rib part protrude in the width direction with respect to a connection part. By expanding the contact area in this manner, the distortion of the elastic body, which is caused by the road surface load being transmitted to the elastic body during traveling of the crawler vehicle, is reduced.

  That is, the connecting portion is made thinner than the rib portion to suppress an increase in the weight of the crawler mandrel, and the distortion of the elastic body that occurs when the crawler vehicle travels can be suppressed.

According to a second aspect of the present invention, in the core metal for a crawler according to the first aspect, the rib protrudes toward the inner peripheral side of the elastic body with respect to the connecting portion .

Crawler core metal according to claim 3 of the present invention, in claim 1 or 2, the end side of the width direction of the wings, when viewed from the circumferential direction, the inner circumferential side of the elastic member It is characterized by being lifted by

  According to the said structure, the edge part side of the width direction of the elastic body in a wing | blade part is lifted to the inner peripheral side of the elastic body seeing from the circumferential direction of the elastic body. Thereby, the crack of an elastic body can be effectively suppressed by making the thickness of the elastic body of an outer peripheral side thick at the edge part of the width direction of the elastic body in a wing | blade part.

The metal core for a crawler according to a fourth aspect of the present invention is the core according to any one of the first to third aspects, wherein the width of the rib portion in the circumferential direction is from the end in the width direction to the central portion of the base body. It is characterized by widening toward the side.

  According to the said structure, the width | variety of the rib part in the circumferential direction is large toward the base | substrate center part side from the edge part of the width direction. It is possible to suppress the deformation of the rib portion caused by the road surface load being transmitted to the elastic body during the traveling of the crawler vehicle from being concentrated on the central portion side of the rib portion.

An elastic crawler according to claim 5 of the present invention is provided in an endless belt-like elastic body that is wound around a drive wheel and a roller wheel, and is provided inside the elastic body, and is arranged at intervals in the circumferential direction of the elastic body. The crawler cored bar according to any one of claims 1 to 4 .

According to the said structure, the core metal for crawlers in any one of Claims 1-4 is arrange | positioned at the elastic body of the elastic crawler at intervals in the circumferential direction of the elastic body. For this reason, after suppressing the weight increase of the core metal for crawlers, the crack of the elastic body which arises at the time of driving | running | working of a crawler vehicle can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the crack which arises in the elastic body which arises at the time of driving | running | working of a crawler vehicle can be suppressed after suppressing the weight increase of the core metal for crawlers.

It is the perspective view which showed the metal core for crawlers which concerns on the 1st reference form of this invention. (A) (B) It is the top view and side view which showed the metal core for crawlers concerning the 1st reference form of this invention. It is sectional drawing which showed the elastic crawler which concerns on the 1st reference form of this invention. It is drawing which showed the evaluation result which evaluated the crack of the rubber body using the elastic crawler which concerns on the 1st reference form of this invention, and the elastic crawler which concerns on a comparison form. (A) (B) It is the top view and front view which showed the elastic crawler which concerns on the 1st reference form of this invention, and the elastic crawler which concerns on a comparison form. (A) (B) It is the conceptual diagram shown about the evaluation direction of the elastic crawler which concerns on the 1st reference form of this invention, and the elastic crawler which concerns on a comparison form. It is the perspective view which showed the elastic crawler which concerns on the 1st reference form of this invention. It is the side view which showed the elastic crawler which concerns on the 1st reference form of this invention. It is the perspective view which showed the metal core for crawlers concerning the 2nd reference form of this invention. (A) (B) It is the top view and side view which showed the metal core for crawlers concerning the 2nd reference form of this invention. It is the perspective view which showed the metal core for crawlers concerning embodiment of this invention. It is sectional drawing which showed the elastic crawler which concerns on embodiment of this invention.

An example of a crawler core 20 and an elastic crawler using the same according to a first reference embodiment of the present invention will be described with reference to FIGS.

(overall structure)
As shown in FIGS. 7 and 8, the sprocket 100 as an example of a drive wheel of a crawler wheel (for example, a combiner, a tractor, etc.) not shown and an idler 102 as an example of an idler wheel are examples of elastic crawlers. An endless rubber crawler 10 is wound around.

  Further, the sprocket 100 is a disc-shaped ring portion 100A attached to the drive shaft of the crawler vehicle, and a convex formed integrally with the outer peripheral surface of the ring portion 100A and arranged at regular intervals in the circumferential direction of the ring portion 100A. And the tooth portion 100B. The idler 102 has a disk shape that is rotatably supported by the crawler wheel.

Further, between the sprocket 100 and the idler 102, a plurality (three in the present embodiment ) of rolling wheels 104 to which road surface load during traveling is transmitted via the rubber crawler 10 are provided. The wheel 104 includes a shaft portion 104A that is rotatably supported by the crawler wheel, and a pair of wheel portions 104B that are attached to the shaft portion 104A and provided with a gap in the axial direction of the shaft portion 104A. It is configured.

In this reference embodiment , the circumferential direction of the endless rubber crawler 10 (arrow S in the figure) is referred to as “crawler circumferential direction”, and the width direction of the rubber crawler 10 (arrow W in the figure) is referred to as “crawler width direction”. To be described. Further, the plate thickness direction of the rubber crawler 10 (arrow T in the figure) is referred to as “crawler plate thickness direction”. Further, in the crawler plate thickness direction, the inner peripheral side of the rubber crawler 10 (arrow IN in the figure) is referred to as “crawler inner peripheral side (elastic inner peripheral side)”, and the outer peripheral side of the rubber crawler 10 (arrow OUT in the figure) is “ It is referred to as “crawler outer peripheral side (elastic body outer peripheral side)”.

  The rubber crawler 10 includes a rubber body 12 as an example of an elastic body in which an elastic material (for example, SBR (styrene butadiene rubber)) is formed in an endless belt shape. And the rubber body 12 is provided with the lug 14 which protrudes from the outer peripheral part of the rubber body 12 to the crawler outer peripheral side, and this lug 14 is provided with two or more in the crawler circumferential direction at intervals.

Further, as shown in FIG. 3 and FIG. 7, a crawler core disposed inside the rubber body 12 and on the inner peripheral side of the crawler with an interval in the crawler circumferential direction (a constant interval in the present embodiment ). A plurality of golds 20 (hereinafter simply referred to as “core metal 20”) are embedded.

  Further, a toothed portion 100 </ b> B of the sprocket 100 is inserted between one core metal 20 and another core metal 20 arranged in the crawler circumferential direction to transmit the driving force of the sprocket 100 to the rubber crawler 10. 16 penetrates in the crawler plate thickness direction. Thereby, the sprocket 100 and the metal core 20 are engaged with each other. Furthermore, both ends in the crawler width direction with respect to the cored bar 20 are ear portions 12A where the cored bar 20 is not disposed when viewed from the crawler plate thickness direction.

  On the other hand, as shown in FIGS. 1 and 3, the cored bar 20 is formed of a metal material and extends in the crawler width direction. The cored bar base 22 protrudes from the cored bar base 22 toward the inner peripheral side of the crawler. It includes a pair of protrusions 24 that are spaced apart in the width direction. The space between the pair of protrusions 24 is a passage space through which the above-described sprocket 100 and idler 102 pass. The outer side of the pair of protrusions 24 in the crawler width direction is a pair of wheel portions provided on the roller 104. It is a passing space through which 104B passes.

  Further, as shown in FIG. 3, a plurality of steel cords 18 extending in the crawler circumferential direction are provided in the rubber body 12 on the crawler outer circumferential side with respect to the core metal 20. The steel cord 18 improves the tensile strength of the rubber crawler 10 in the crawler circumferential direction.

(Main part configuration)
Next, the core metal base 22 of the core metal 20 will be described.

  As shown in FIG. 1 and FIG. 2A, a base central portion 26 having a thickness in the crawler plate thickness direction thicker than other portions is provided on the central side of the core metal base 22 in the crawler width direction. Is formed.

  And the base end part of the projection part 24 mentioned above is integrally connected with the both ends of the crawler width direction in the base | substrate center part 26. As shown in FIG. That is, the protrusion 24 is provided with a tip protruding from the both ends of the base central portion 26 in the crawler width direction toward the inner periphery of the crawler.

  Further, a pair of wing portions 28 extending from both ends in the crawler width direction of the base body central portion 26 to the outside in the crawler width direction (end surface side of the rubber crawler 10) are provided. And the thickness in the crawler plate | board thickness direction of the wing | blade part 28 is gradually thinned toward the outer side of a crawler width direction (refer FIG. 3).

  Moreover, a pair of rib part 30 which comprises the wing | blade part 28 is extended in the crawler width direction at intervals in the roller circumferential direction. Furthermore, between the pair of rib portions 30 is a connecting portion 32 that constitutes the wing portion 28 and connects the pair of rib portions 30.

  Specifically, as shown in FIG. 2B, the thickness of the rib portion 30 in the crawler plate thickness direction is thicker than the connecting portion 32. In other words, the thickness of the connecting portion 32 is made thinner than the thickness of the rib portion 30. Furthermore, the crawler outer peripheral surface 31 constituted by the pair of rib portions 30 and the connecting portion 32 is planar when viewed from the crawler width direction.

  Further, as shown in FIG. 2 (A), the width of the rib portion 30 in the crawler circumferential direction (A dimension shown in FIG. 2 (A)) is from the end in the crawler width direction toward the substrate central portion 26 side. It is getting wider. In other words, the width of the connecting portion 32 in the crawler circumferential direction (dimension B shown in FIG. 2A) increases from the base portion 26 side toward the end in the crawler width direction.

  Further, the outer side of the rib portion 30 in the crawler width direction is provided so as to protrude in the crawler width direction with respect to the connecting portion 32, and the outer surface of the protruding portion 30A is configured by a curved surface that protrudes outward. Alternatively, the outer side of the connecting portion 32 in the crawler width direction is recessed inward in the crawler width direction with respect to the rib portion 30, and the outer surface of the protruding portion 30A of the rib portion 30 protruding from the connecting portion 32 is convex outward. It consists of a curved surface.

  As described above, the cored bar base 22 includes the base central portion 26 and the pair of wing portions 28, and the wing portion 28 includes the pair of rib portions 30 and the coupling portion 32.

(Action / Effect)
Next, the operation of the crawler mandrel 20 and the rubber crawler 10 will be described.

  As shown in FIGS. 7 and 8, the sprocket 100 is driven to rotate in the direction of arrow C when a crawler vehicle (not shown) travels. Then, the tooth portion 100 </ b> B provided in the sprocket 100 is inserted into the through hole 16 formed in the rubber crawler 10 and meshed with the base central portion 26, whereby the driving force is transmitted to the rubber crawler 10.

  The rubber crawler 10 to which the driving force is transmitted circulates in the direction of arrow D between the sprocket 100, the idler 102, and the plurality of wheels 104, and the crawler vehicle travels.

  At this time, as shown in FIGS. 3 and 7, the sprocket 100 and the idler 102 pass through a passage space formed between the pair of protrusions 24. Further, the pair of ring portions 104 </ b> B passes through a passage space provided outside the pair of protrusions 24 in the crawler width direction. Thereby, the position shift of the crawler width direction of the rubber crawler 10 with respect to the crawler wheel is suppressed.

  As shown in FIG. 3, when the rubber crawler 10 circulates between the sprocket 100 and the idler 102, the road surface load is applied to the core metal base 22 of the core metal 20 through the lugs 14 provided on the rubber body 12. Communicated.

  Here, the rib portion 30 protrudes outward in the crawler width direction from the connecting portion 32, and the protruding portion 30A of the rib portion 30 is configured with a curved surface, so that the rib portion protrudes outward in the crawler width direction from the connecting portion. Compared with the case where there is not, the area where the metal core base 22 and the rubber body 12 come into contact with each other at the tip of the wing portion 28 is widened. That is, the road surface load during traveling is transmitted to the tip of the wing portion 28 through the contact surface with an increased contact area.

  Then, in the vicinity of the tip of the wing portion 28, the amount of deformation due to road load during travel varies between the part where the cored bar 20 is disposed and the part where the cored bar 20 is not disposed as viewed from the crawler plate thickness direction. For this reason, a crack may occur in the ear portion 12A.

Therefore, the cracks in the ear portion 12A were evaluated (ear portion damage durability evaluation) using the rubber crawler according to the present reference embodiment and the rubber crawler according to the comparative embodiment.

As shown in FIG. 5A, the core 20 of the rubber crawler according to the present embodiment used for the evaluation is 8 mm in the crawler plate thickness direction at the tip portion of the rib portion 30, and the connecting portion The tip 32 has a thickness of 4 mm. Further, R on the outer peripheral side of the crawler at the tip of the rib portion 30 as viewed from the crawler circumferential direction is 6 mm. As a result. The product weight of the core 20 of the rubber crawler according to this embodiment is 980 g (see FIG. 4).

On the other hand, as shown in FIG. 5B, the rib portion 122 and the connecting portion are not provided in the blade portion 122 of the core 120 of the rubber crawler according to the comparative form used for the evaluation. The portion 122 has a constant shape along the crawler circumferential direction. Further, the thickness in the crawler plate thickness direction at the tip of the wing 122 is 8 mm. Further, R on the outer periphery side of the crawler at the tip end portion of the wing portion 122 viewed from the crawler circumferential direction is 4 mm. As a result. The product weight of the core 120 of the rubber crawler according to the comparative example was 1170 g (see FIG. 4). For shapes other than those described above, the shape of the reference embodiment and the shape of the comparative embodiment are equivalent.

As for the evaluation method, as shown in FIGS. 6 (A) and 6 (B), a rubber crawler inclined at 15 degrees as viewed from above with respect to the curb 130 having a height of 150 mm is mounted on the curb 130 so that Ear part damage durability evaluation was performed about the crack of the part 12A. The presence or absence of the cracks in the ear 12A was determined visually. Regarding the evaluation conditions other than those described above, the evaluation conditions of the present reference embodiment and the evaluation conditions of the comparative embodiment are equivalent.

As shown in the evaluation results in FIG. 4, with regard to the ear damage durability, in the rubber crawler according to the present embodiment , the ears were cracked on average 4.5 times when run in the direction of the arrow in FIG. occured. On the other hand, in the rubber crawler according to this comparative embodiment, cracks occurred in the ear portion at the average third time when the rubber crawler was run a plurality of times in the direction of the arrow in FIG.

As can be seen from the above evaluation results, in this embodiment , the rib portion 30 is protruded to the outside in the crawler width direction from the connecting portion 32 to increase the contact area with the rubber body 12 at the tip portion of the wing portion 28. The distortion of the rubber body 12 can be reduced.

Moreover, the crack which generate | occur | produces in the ear | edge part 12A of the rubber body 12 can be suppressed because the distortion of the rubber body 12 reduces.
Moreover, the weight increase of the metal core 20 is suppressed by making the thickness of the connection part 32 thinner than the thickness of the rib part 30. That is, it is possible to suppress cracks that occur in the ear portions 12A of the rubber body 12 that are generated when the crawler vehicle is traveling, while suppressing an increase in the weight of the cored bar 20.

  Further, the rib portion 30 is deformed by the road surface load by expanding the width of the rib portion 30 in the crawler circumferential direction from the end portion in the crawler width direction toward the base body central portion 26 as compared with the case where the width is constant. Can be prevented from concentrating on the base portion 26 side of the rib portion 30.

  The crawler outer peripheral surface 31 constituted by the pair of rib portions 30 and the connecting portion 32 is flat when viewed from the crawler width direction. Thereby, the crack of the rubber body 12 can be effectively suppressed by preventing the rubber body 12 from being locally distorted by the road surface load being transmitted to the rubber body 12 when the crawler vehicle is traveling.

Next, an example of the crawler core 40 according to the second embodiment of the present invention and an elastic crawler using the same will be described with reference to FIGS. In addition, about the same member as 1st reference form , the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 9 and 10A and 10B, the second reference embodiment is different from the first reference embodiment , and is a crawler outer peripheral surface composed of a pair of rib portions 44 and a connecting portion 46. Reference numeral 45 denotes a curved surface that protrudes toward the outer periphery of the crawler when viewed from the crawler width direction.

  Thus, by making the surface 45 on the crawler outer peripheral side of the metal core base 42 into a curved surface, the contact area between the crawler outer peripheral surface 45 and the rubber body 12 is widened as compared to a flat surface. Thereby, the distortion of the rubber body 12 can be reduced and the crack which arises in the rubber body 12 can be suppressed.

Next, an example of a crawler core 50 and an elastic crawler using the same according to an embodiment of the present invention will be described with reference to FIGS. 11, 12A, and 12B. In addition, about the same member as 1st reference form , the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIGS. 11, 12 </ b> A and 12 </ b> B, in this embodiment , unlike the first reference embodiment , the outer periphery of the crawler in the cored bar base 52 constituted by a pair of rib portions 54 and a connecting portion 56. The side surface 55 is not flat when viewed from the crawler width direction. The rib part 54 protrudes to the crawler outer peripheral side with respect to the connection part 56 over the crawler width direction.

  As a result, the contact area between the rubber body 12 and the cored bar base 52 is increased on the outer peripheral side of the crawler, and the distortion of the rubber body 12 that occurs when the crawler vehicle is traveling can be effectively suppressed.

  Further, the end portion side of the wing portion 58 in the crawler width direction is bent (bent) and lifted to the crawler inner peripheral side when viewed from the crawler circumferential direction. Thereby, the thickness (E dimension shown to FIG. 12 (A)) of the ear | edge part 12A in the crawler board thickness direction becomes thick, and the crack which arises in the ear | edge part 12A can be suppressed.

Although the present invention has been described in detail with reference to the first and second reference embodiments and embodiments , the present invention is not limited to the respective embodiments, and other various implementations are within the scope of the present invention. It will be apparent to those skilled in the art that the form is possible. For example, in the above-described embodiment, one cored bar 20, 40, 50 and the other cored bar 20, 40, 50 are arranged at a certain interval. You may connect the protrusion part of a metal core, and the protrusion part of another metal core.

  In the above embodiment, SBR (styrene butadiene rubber) is described as an example of an elastic material. However, other rubber materials may be used, and a resin such as TPO (thermoplastic elastomer) may be used. Also good.

  Moreover, in the said embodiment, although the outer surface of the front-end | tip part of the rib parts 30,44,54 was comprised by the curved surface which protrudes outside, all the outer surfaces do not need to be a curved surface, and at least one part is a curved surface If it is. When a curved surface is provided on a part of the outer surface, the edge of the outer surface of the crawler outer peripheral side at the tip of the ribs 30, 44, 54 is curved, compared to the case where other parts are curved. And the crack of the rubber body 12 which arises at the time of driving | running | working of a crawler vehicle can be suppressed effectively.

  Moreover, although the case where the protrusion part 24 was provided in the metal core 20,40,50 was demonstrated to the example in the said embodiment, it was not limited to this in particular, A protrusion may not be provided in the metal core.

10 Rubber crawler (an example of an elastic crawler)
12 Rubber body (an example of an elastic body)
20 Crawler Core 22 Core Metal Base 26 Base Center 28 Blade 30 A Rib 30 A Projection 31 Surface 32 Connection 40 Crawler Core 42 Core Metal Base 44 Rib 45 Surface 46 Connection 50 Crawler Core 52 Core metal base 54 Rib part 56 Connection part 58 Wing part 100 Sprocket 104 Rolling wheel

Claims (5)

A cored bar base that is provided inside an endless belt-like elastic body that is wound around a drive wheel and a roller, extends in the width direction of the elastic body, and is disposed in the circumferential direction of the elastic body ;
A base central portion located in the central portion in the width direction of the core metal base ;
Wings extending from the center of the base body in the width direction of the elastic body,
The wing portion is configured to be provided with a gap in the circumferential direction, and the thickness of the elastic body in the plate thickness direction is increased with respect to the connecting portion provided therebetween, and the elastic property with respect to the connecting portion. A pair of rib portions that protrude to the outer peripheral side of the body and that protrude in the width direction with respect to the connecting portion;
A core for a crawler. The core metal for a crawler according to claim 1, wherein the rib portion protrudes toward the inner peripheral side of the elastic body with respect to the connecting portion. The core metal for a crawler according to claim 1 or 2 , wherein an end portion side in the width direction of the wing portion is lifted to an inner peripheral side of the elastic body when viewed from the circumferential direction. The core metal for a crawler according to any one of claims 1 to 3 , wherein a width of the rib portion in the circumferential direction is wider from an end portion in the width direction toward the center of the base. An endless belt-like elastic body wound around the driving wheel and the rolling wheel;
The cored bar for a crawler according to any one of claims 1 to 4 , wherein the cored bar is provided inside the elastic body and arranged at intervals in a circumferential direction of the elastic body.
Elastic crawler with.

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