JP6285266B2 - Elastic crawler - Google Patents

Description

  The present invention relates to an elastic crawler.

  A conventional elastic crawler is a rubber crawler having a plurality of core bars embedded side by side in rubber at a fixed pitch, and is driven by covering a pair of corners protruding left and right of the core bars with a rubber member. There is a projection that forms a recess at the interface between the core metal and the rubber portion at the center of the rubber crawler located between the drive projections (for example, Patent Document 1). According to this configuration, it is possible to prevent peeling of the bonding boundary between the central portion of the cored bar and the rubber portion, which is caused by rolling of the sprocket or the like.

JP-A-11-222169

  On the other hand, when the elastic crawler is wound around the sprocket and bent, the inner peripheral surface of the rubber elastic body is compressed in the circumferential direction between the drive protrusions. However, since the conventional elastic crawler including Patent Document 1 has only the driving protrusions disposed on the flat inner peripheral surface of the rubber elastic body (main body), the inner portions between the driving protrusions in the circumferential direction are not provided. The peripheral surface is the same height as the other inner peripheral surfaces. For this reason, when the rubber is distorted due to compression between the drive protrusions, there is no escape space for the rubber, and the distortion is locally increased, which may cause a crack in the inner peripheral surface of the rubber elastic body.

  The objective of this invention is providing the elastic crawler which can suppress generation | occurrence | production of the crack in the area | region between the circumferential direction of an internal peripheral protrusion, and its progress.

The elastic crawler of the present invention has an endless main body and a plurality of inner peripheral protrusions protruding from the inner peripheral surface of the main body, and the inner peripheral protrusions are arranged at regular intervals in the circumferential direction. A first recess formed on the inner peripheral surface of the main body between the inner peripheral protrusions adjacent to each other in the circumferential direction and recessed from the inner peripheral surface of the main body, and the first recess. Also has a second recess formed outside the inner peripheral surface of the main body and recessed from the inner peripheral surface of the main body, and the second recess has a depth from the inner peripheral surface of the main body of the first recess. It is different, and is arranged so as to overlap in the width direction in the first recess and at least a partial region in the circumferential direction of the first recess.
According to the elastic crawler of the present invention, it is possible to suppress the occurrence and development of cracks in the region between the inner peripheral protrusions in the circumferential direction. In the present invention, the “width direction” means the width direction of the endless elastic crawler, and the “circumferential direction” means the circumferential direction (longitudinal direction) of the elastic crawler.

In the present invention, the second recess may be shallower than the first recess from the inner peripheral surface of the main body.
In this case, the occurrence of the crack and its progress can be suppressed without forming an extremely thin portion with respect to the main body.

In this invention, it is preferable that the said 2nd hollow is arrange | positioned at least in the area | region of the width direction outer side rather than the width direction outer edge of the said internal peripheral protrusion.
In this case, the first recess can exist up to the full width direction of the inner peripheral projection, whereby local distortion can be alleviated to the maximum by the first recess.

In this invention, it is preferable that the said 2nd hollow is arrange | positioned so that the said 1st hollow may overlap in the width direction in the area | region more than 1/2 of the circumferential direction of the said 1st hollow.
In this case, the progress of the crack can be more effectively suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the elastic crawler which can suppress generation | occurrence | production of the crack in the area | region between the circumferential direction of an internal peripheral protrusion, and its progress can be provided.

It is a perspective view showing typically the state where a rubber crawler concerning one embodiment of the present invention was wound around a sprocket in a partial cross section. It is a top view which shows a part of rubber crawler of FIG. 1 from the inner peripheral surface side of the said rubber crawler. It is II sectional drawing of FIG. It is sectional drawing which shows the rubber crawler which concerns on other embodiment of this invention in the cross section equivalent to the II cross section of FIG.

  Hereinafter, a rubber crawler (elastic crawler) according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, “width direction X” means the width direction of endless rubber crawler 1 or its main body 2, and “circumferential direction Y” means the circumferential direction of rubber crawler 1 or its main body 2. (Longitudinal direction).

  In the figure, reference numeral 1 denotes a rubber crawler according to an embodiment of the present invention. The rubber crawler 1 has an endless main body 2. In the present embodiment, the main body 2 is formed of a plurality of core bars 2a, a steel cord layer 2b made of a plurality of steel cords, and a rubber elastic body 2c. More specifically, the main body 2 has a plurality of metal cores 2a arranged side by side in the direction extending in the width direction X and arranged at a constant interval (pitch) in the circumferential direction Y. After enclosing with the layer 2b, it is formed by covering with a rubber elastic body 2c.

Further, the rubber crawler 1 has a plurality of lugs (outer peripheral protrusion) 3 which projects from the outer peripheral surface 2f ₁ of the main body 2. The lug 3 is also made of a rubber elastic body. In the present embodiment, the pair of lugs 3 arranged at intervals in the width direction X are arranged at constant intervals in the circumferential direction Y. However, the shape and arrangement of the lugs 3 are not limited to the shape and arrangement of the present embodiment, and can be appropriately changed. Further, the lug 3 can be configured integrally with the rubber elastic body 2c of the main body 2 or can be configured separately.

Further, the rubber crawler 1 has a plurality of guide projections (inner peripheral projection) 4 projecting from the inner peripheral surface 2f ₂ of the main body 2. In the present embodiment, a pair of guide protrusions 4 arranged at intervals in the width direction X are arranged at constant intervals in the circumferential direction Y. More specifically, the guide protrusion 4 is formed by covering a pair of protrusions provided on the cored bar 2a with an interval in the width direction X with a rubber elastic body 2c. The guide protrusion 4 of the present embodiment is a core metal 2a covered with a rubber elastic body 2c. However, the guide protrusion 4 can be formed only of the rubber elastic body 2c. In this case, the guide protrusion 4 can be formed integrally with the rubber elastic body 2c of the main body 2 or can be formed separately.

As shown in FIG. 2, the inner peripheral surface 2 f ₂ of the main body 2 has a through hole A at a constant interval (pitch) in the circumferential direction Y between a pair of guide protrusions 4 arranged in the width direction X. A plurality of recesses C are formed. The external teeth 10 a of the sprocket 10 (see FIG. 1) mesh with the through hole A of the recess C to transmit the rotation of the sprocket 10 to the rubber crawler 1.

Further, as shown in FIG. 2, the first recess 5 is disposed between the guide protrusions 4 adjacent in the circumferential direction Y on the inner peripheral surface 2 f ₂ of the main body 2. As shown in FIG. 3, in the present embodiment, the first recess 5 is formed so as to be recessed closer to the outer peripheral surface 2 f ₁ side of the main body 2 than the inner peripheral surface 2 f _{2 of the} main body 2. In the present embodiment, the first recess 5 is formed by a step 5s and a bottom 5f. In the present embodiment, the bottom 5f forms a plane. In the present embodiment, as shown in FIG. 2, the width in the width direction X of the bottom 5 f is the width direction center side edge 5 e ₁ located on the center side in the width direction X of the main body 2 and the width of the main body 2. It is defined by the width direction outer edge 5e ₂ located outside the direction X.

In the present embodiment, the width direction center side edge 5e ₁ of the bottom 5f coincides with the opening edge of the recess C, which is located outside the width direction X of the main body 2 and forms the upper end opening of the recess C. By extending in the circumferential direction Y, the two guide protrusions 4 arranged in the circumferential direction Y are connected. Further, the width direction outer edge 5e ₂ of the bottom portion 5f extends in the circumferential direction Y, thereby being connected to one guide protrusion 4 arranged in the circumferential direction Y.

Further, as shown in FIG. 2, in the present embodiment, the length of the bottom portion 5f in the circumferential direction Y is defined by the circumferential edge 5e ₃ and the circumferential edge 5e ₄ located on both sides of the circumferential direction Y. . As shown in FIG. 2, the bottom 5 f of the first recess 5 is continuously connected to each of the two guide protrusions 4 arranged in the circumferential direction Y in the circumferential direction Y direction.

Further, as shown in FIG. 2, the second recess 6 is disposed on the inner peripheral surface 2 f ₂ of the main body 2 outside the first recess 5 in the width direction X. As shown in FIG. 3, in the present embodiment, the second recess 6 is formed so as to be recessed toward the outer peripheral surface 2 f ₁ side of the main body from the inner peripheral surface 2 f ₂ of the main body 2. In the present embodiment, the second recess 6 is different from the first recess 5 in depth from the inner peripheral surface 2 f ₂ of the main body 2. In the present embodiment, as shown in FIG. 3, the second recess 6 has a depth that is shallower than the first recess 5 from the inner peripheral surface 2 f ₂ of the main body 2. As a specific example of the depth, about 1/2 of the depth between the inner peripheral surface 2f ₂ of the main body 2 and the first recess 5, for example, a range of 1/3 to 2/3, 2/5 to 3/5. Range. In the present embodiment, the second recess 6 is also formed by the step 6s and the bottom 6f. In the present embodiment, the bottom 6f of the second recess 6 forms a plane.

In the present embodiment, as shown in FIG. 2, the width in the width direction X of the bottom 6 f is the width direction center side edge 6 e ₁ located on the center side in the width direction X of the main body 2 and the width of the main body 2. It is defined by the width direction outer edge 6e ₂ located outside the direction X. In the present embodiment, the width direction center side edge 6e ₁ of the bottom portion 6f coincides with the width direction outer edge 4e ₂ of the one guide protrusion 4 and faces the other guide protrusion 4 along the circumferential direction Y. Extend. In addition, as shown in FIG. 2, in the present embodiment, the length in the circumferential direction Y of the bottom 6f is defined by circumferential edges 6e ₃ and 6e ₄ located on both sides of the circumferential direction Y. The circumferential end edges 6e ₃ and 6e ₄ are respectively connected to the width direction center side edge 6e ₁ and the width direction outer end edge 6e ₂ to form the external shape of the bottom 6f as shown in FIG.

  Further, as shown in FIG. 2, the second recess 6 is a portion adjacent to the first recess 5, and the first recess 5 and at least a part of the circumferential direction Y of the first recess 5 in the width direction X It is arranged to overlap. In the present embodiment, the second dent 6 is a portion adjacent to the first dent 5, and the first dent 5 and an area at least ½ or more in the circumferential direction Y of the first dent 5 over the width direction X. It is arranged to wrap. More preferably, the second dent 6 is a portion adjacent to the first dent 5 and is arranged so as to overlap the first dent 5 and the entire width direction Y of the first dent 5 in the width direction X. The

In the present embodiment, as shown in FIG. 3, the width direction center side edge 6 e ₁ of the bottom 6 f of the second recess 6 located on the center side in the width direction X of the main body 2 is located outside the width direction X. The first recess 5 is shifted outward in the width direction X with respect to the outer edge 5e _{2 in} the width direction of the bottom 5f. Thereby, as shown in FIG. 2, a step 5 s extending in the width direction X of the main body 2 is formed in the first recess 5 so as to border the outside of the width direction outer end edge 5 e ₂ of the bottom 5 f. The In the present embodiment, as shown in FIG. 3, the step 5 s extends from the outer edge 5 e _{2 in} the width direction of the bottom 5 f of the first recess 5 to the center edge 6 e ₁ in the width direction of the bottom 6 f of the second recess 6. It is formed as an inclined surface that rises. However, the step 5s can also be formed as a vertical plane parallel to the orthogonal direction Z orthogonal to the circumferential direction X and the circumferential direction Y.

As shown in FIG. 2, the second recess 6 also includes the width direction outer edge 6e ₂ , the circumferential edge 6e ₃ and the circumferential edge 6e _{4 of} the bottom 6f, the inner circumferential surface 2f ₂ of the main body ₂ and the like. A step 6s extending in the width direction X and the circumferential direction Y is formed so as to border the outside of the bottom 6f. As shown in FIG. 3, the step 6 s is formed as an inclined surface that rises toward the inner peripheral surface 2 f ₂ of the main body 2 as it goes outward in the width direction X. However, the step 6s can also be formed as a vertical plane parallel to the orthogonal direction Z.

  According to the rubber crawler 1 of the present embodiment, as shown in FIG. 1, when the rubber crawler 1 is wound around the sprocket 10 and bent, the rubber elastic bodies 5c between the guide protrusions 4 in the circumferential direction Y are compressed. Even if it does, local distortion can be relieved by the 1st hollow 5 formed between the guide protrusions 4 becoming a refuge. Moreover, even when local distortion cannot be relieved by the 1st hollow 5, the local distortion which cannot be relieved by the 1st hollow 5 can further be relieve | moderated by the 2nd hollow 6 becoming a new escape place. . In addition, even if a crack occurs in the first recess 5, the generation of the crack to the outside in the width direction X and the progress thereof can be prevented by the second recess 6.

Therefore, according to the rubber crawler 1 of this embodiment, when the rubber crawler 1 is bent, the rubber crawler 1 in a region between the circumferential directions of the guide protrusions 4 provided on the inner peripheral surface 2f ₂ of the endless main body 2 is locally increased. In addition, it is possible to alleviate general distortion and to suppress the occurrence of cracks and the progress of the cracks in the region between the circumferential directions Y of the guide protrusions 4 on the inner peripheral surface 2f ₂ of the main body 2.

As shown in FIG. 3, in the rubber crawler 1 of the present embodiment, the first recess 5 is connected to the second recess 6 via an inclined step 5s, so that the compressed rubber can be smoothly transferred to the second recess. 6 can escape. Similarly, the second recess 6 is connected to the inner peripheral surface 2f ₂ of the main body 2 through the inclined step 6s, so that the compressed rubber can be smoothly released to the inner peripheral surface 2f ₂ of the main body 2.

Further, in the rubber crawler 1 of the present embodiment, the second depression 6 is disposed at least in a region outside the width direction X of the guide protrusion 4 in the width direction X with respect to the width direction outer edge 4e ₂ . In this case, as in the present embodiment, the first recess 5 can exist up to the full width direction X of the guide protrusion 4, thereby reducing local distortion to the maximum by the first recess 5. Can do.

Further, in the rubber crawler 1 of the present embodiment, the second recess 6 has a region adjacent to the first recess 5 that is at least a half or more in the circumferential direction Y of the first recess 5. Are arranged so as to overlap in the width direction X. In this case, when a crack occurs in the inner peripheral surface 2f ₂ of the main body 2 between the circumferential directions Y of the guide protrusions 4, the progress of the crack can be more effectively suppressed. Furthermore, the second dent 6 is disposed so that a portion adjacent to the first dent 5 overlaps the first dent 5 and the entire width direction Y of the first dent 5 in the width direction X. Is preferred. In this case, between each other in the circumferential direction Y of the guide protrusion 4, when a crack in the inner peripheral surface 2f ₂ of the main body 2 has occurred, it is possible to most effectively suppress the progress of the crack.

  Next, FIG. 4 shows a rubber crawler 1 ′ according to another embodiment of the present invention in a cross section corresponding to the II cross section of FIG. 2. In the following description, parts substantially the same as those of the rubber crawler 1 are denoted by the same reference numerals, and the description thereof is omitted.

In the rubber crawler 1 ′ according to this embodiment, the second recess 9 extends in the circumferential direction Y, is connected to the two guide protrusions 4 arranged in the circumferential direction Y, and extends from the inner peripheral surface 2 f ₂ of the main body 2. Is deeper than the first recess 5. In the rubber crawler 1 ′ according to the present embodiment, the second recess 9 is formed as a recess whose depth from the inner peripheral surface 2 f ₂ of the main body 2 is deeper than the bottom 5 f of the first recess 5. Again, by the rubber crawler 1 'is bent, it is possible to suppress the occurrence and development of cracks occurring therebetween in the circumferential direction of the guide protrusion 4 provided on the inner peripheral surface 2f ₂ of the endless body 2 .

  In the rubber crawler 1 ′ according to the present embodiment, the bottom surface of the second recess 9 can be configured as a flat surface, similar to the second recess 6 of the rubber crawler 1 in the above-described embodiment. In the present embodiment, the step 9s of the second recess 9 is formed as a curved surface, but it can also be an inclined surface, like the step 6s of the second recess 6 in FIG. Furthermore, in the rubber crawler 1 ′ according to the present embodiment, the relationship between the first recess 5 and the second recess 9 in the width direction X, the circumferential direction Y, and the vertical direction Z is the same as that of the rubber crawler 1 in the above-described embodiment. It can be set similarly to the first recess 5 and the second recess 6.

The above description is only one embodiment of the present invention, and various modifications can be made according to the scope of the claims. For example, in the present embodiment, the two guide protrusions (inner peripheral protrusions) 4 arranged in the width direction X are arranged offset in the circumferential direction Y, but are arranged in alignment in the width direction X. You can also. A plurality of guide protrusions (inner peripheral projection) 4 projecting from the inner peripheral surface 2f ₂ of the main body 2 is not limited to a pair of guide projections 4 which are spaced in the width direction X, for example, the width direction A plurality of guide protrusions 4 extending in X may be arranged in the circumferential direction Y at regular intervals. The present invention can also be applied to an elastic crawler in which at least one of the cored bar 2a and the steel cord layer 2b is omitted. In addition, various configurations, arrangements, and the like adopted in each embodiment can be used by appropriately combining and replacing each other.

  The present invention is used for an elastic crawler having an endless main body and a plurality of inner peripheral protrusions protruding from the inner peripheral surface of the main body, and the inner peripheral protrusions are arranged at regular intervals in the circumferential direction. can do.

  1: rubber crawler (elastic crawler), 1 ': rubber crawler (elastic crawler), 2: main body, 2a: cored bar, 2b: steel cord layer, 2c: rubber elastic body, 3: lug, 4: guide protrusion (inside Circumferential protrusion), 5: first recess, 6: second recess, 7: step, 8: step, 9: second recess, X: width direction, Y: circumferential direction

Claims (4)

An elastic crawler having an endless main body and a plurality of inner peripheral protrusions protruding from the inner peripheral surface of the main body, the inner peripheral protrusions being arranged at a constant interval in the circumferential direction,
The elastic crawler has a plurality of metal cores embedded in the main body, arranged at regular intervals in the circumferential direction,
The metal core includes a pair of protrusions protruding from the inner peripheral surface of the main body and spaced apart in the width direction, and wings extending outward in the width direction from each of the pair of protrusions. Prepared,
The inner peripheral protrusion is configured to include the protrusion of the cored bar,
On the inner peripheral surface of the main body,
A first recess formed between the inner peripheral projections adjacent in the circumferential direction and recessed from the inner peripheral surface of the main body;
A second recess formed outside the first recess in the width direction and recessed from the inner peripheral surface of the main body,
The second dent is different from the first dent in the depth from the inner peripheral surface of the main body, and in the width direction in the first dent and at least a part of the circumferential direction of the first dent. all SANYO arranged to overlap, and wherein said wing portions of the core metal, the der Rukoto that are arranged so as not to overlap in the thickness direction of the elastic crawler, the elastic crawler .   2. The elastic crawler according to claim 1, wherein the second recess has a shallower depth from the inner peripheral surface of the main body than the first recess.   3. The elastic crawler according to claim 1, wherein the second dent is disposed at least in a region on the outer side in the width direction with respect to the outer edge in the width direction of the inner peripheral protrusion.   In any 1 item | term of the Claims 1 thru | or 3, a said 2nd hollow is arrange | positioned so that it may overlap with the said 1st hollow in the width direction in the area | region more than 1/2 of the circumferential direction of the said 1st hollow. An elastic crawler.

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