JP2017071372A - Elastic crawler and elastic crawler device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic crawler which has suppressed bending resistance, and an elastic crawler device capable of reducing power loss in travel time, by the elastic crawler, and improving fuel consumption.SOLUTION: An elastic crawler 1A is configured to have a V groove 6 which extends in a width direction or in a manner of being inclined to the width direction, in a manner of making an inner peripheral face 2f dent, on the inner peripheral face 2f of an endless-state body 2 having elasticity. A ratio of a groove width and a groove depth of the V groove 6 in a circumferential direction of the body is preferably (1.05-2.05):1. An elastic crawler device has the elastic crawler 1A.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an elastic crawler and an elastic crawler device.

  In the conventional elastic crawler, the inner peripheral surface (inner peripheral portion) of the endless belt-shaped main body (elastic crawler main body) extends from the outer edge in the width direction of the rolling wheel rolling surface (rolling wheel passage surface) and extends in the width direction outer edge ( By forming recesses (first recesses) opened at the width end of the crawler body at intervals in the circumferential direction, the bending resistance in the circumferential direction of the body is locally reduced, so that the body is easily bent. Thus, it is known that the power loss during traveling is reduced and the fuel consumption is improved (see, for example, Patent Document 1).

JP 2012-111368 A

  However, as a result of testing and research, the inventor of the present application has come to recognize that the suppression of bending resistance in the circumferential direction of the main body further relates to the cross-sectional shape of the recess.

  Accordingly, an object of the present invention is to provide an elastic crawler and an elastic crawler device in which bending resistance is suppressed.

The elastic crawler according to the present invention is characterized in that a V-groove extending in the width direction of the main body is provided on the inner peripheral surface of the elastic endless belt-like main body.
Here, “extending in the width direction of the main body” means not only extending in parallel to the width direction but also including extending in an inclination with respect to the width direction.
According to the elastic crawler of the present invention, it is possible to provide an elastic crawler in which bending resistance is suppressed.

In the elastic crawler according to the present invention, it is preferable that the ratio between the groove width of the V groove in the circumferential direction of the main body and the groove depth of the V groove is (1.05 to 2.05): 1.
In this case, the crack which generate | occur | produces when the surface of a V-groove is bent repeatedly can be suppressed.

In the elastic crawler according to the present invention, the elastic crawler has a plurality of core bars embedded in the main body at intervals in the circumferential direction of the main body, and each of the core bars adjacent to each other in the circumferential direction of the main body, It is preferable to provide a V-groove.
In this case, the crack which generate | occur | produces when the surface of a V-groove is bent repeatedly can be suppressed.

In the elastic crawler according to the present invention, a part of the inner peripheral surface may form a rolling wheel rolling surface, and the rolling groove rolling surface may be provided with the V-groove extending inclined with respect to the width direction of the main body. preferable.
In this case, it is possible to suppress the vibration accompanying the up-and-down movement caused by fitting or falling on a wheel or the like while suppressing the bending resistance.

In the elastic crawler according to the present invention, it is preferable that the V groove extends over the entire width direction of the main body of the rolling wheel rolling surface.
In this case, bending resistance can be further suppressed.

The elastic crawler device according to the present invention includes any one of the above-described elastic crawlers.
According to the elastic crawler device of the present invention, it is possible to provide an elastic crawler device in which bending resistance is suppressed.

  According to the present invention, it is possible to provide an elastic crawler and an elastic crawler device in which bending resistance is suppressed.

(A) is the top view which showed a part of elastic crawler concerning the 1st Embodiment of this invention from the inner peripheral surface side, (b) is AA sectional drawing of (a). is there. It is XX sectional drawing of Fig.1 (a). It is the top view which showed a part of elastic crawler concerning the 2nd Embodiment of this invention from the inner peripheral surface side. It is the top view which showed a part of elastic crawler concerning the 3rd Embodiment of this invention from the inner peripheral surface side. It is a perspective view of the analysis model which modeled the elastic crawler concerning the present invention. (A) is a side view for demonstrating the groove width and groove depth of a V-groove of the analysis model which concerns on Example 1 of this invention, (b) is the analysis which concerns on Example 1 of this invention It is the distribution characteristic data which shows the analysis result of distortion distribution from the inner peripheral surface side of an analysis model when it is assumed that the model was wound around the modeled sprocket. (A), (b) is the distribution characteristic data which expanded a part of FIG.6 (b), respectively. (A) is a side view for demonstrating the groove width and groove depth of a V-groove of the analysis model which concerns on Example 2 of this invention, (b) is the analysis which concerns on Example 2 of this invention It is the distribution characteristic data which shows the analysis result of distortion distribution from the inner peripheral surface side of an analysis model when it is assumed that the model was wound around the modeled sprocket. (A), (b) is the distribution characteristic data which expanded a part of FIG.8 (b), respectively. (A) is a side view for demonstrating the groove width and groove depth of V groove of the analysis model which concerns on Example 3 of this invention, (b) is the analysis which concerns on Example 3 of this invention It is the distribution characteristic data which shows the analysis result of distortion distribution from the inner peripheral surface side of an analysis model when it is assumed that the model was wound around the modeled sprocket. (A), (b) is the distribution characteristic data which expanded a part of FIG.10 (b), respectively. (A) is a side view for demonstrating the groove width and groove depth of a V-groove of the analysis model which concerns on Example 4 of this invention, (b) is the analysis which concerns on Example 4 of this invention It is the distribution characteristic data which shows the analysis result of distortion distribution from the inner peripheral surface side of an analysis model when it is assumed that the model was wound around the modeled sprocket. (A), (b) is the distribution characteristic data which expanded a part of FIG.12 (b), respectively. (A) is a side view of an analysis model according to Comparative Example 1 of the present invention, and (b) is a strain distribution when it is assumed that the analysis model according to Comparative Example 1 is wound around a modeled sprocket. This is the distribution characteristic data showing the analysis result from the inner peripheral surface side of the analysis model. (A), (b) is the distribution characteristic data which expanded a part of FIG.14 (b), respectively.

  Hereinafter, an elastic crawler and an elastic crawler device according to various embodiments of the present invention will be described with reference to the drawings.

  In FIG. 1 (a) and FIG. 2, reference numeral 1A denotes an elastic crawler according to the first embodiment of the present invention. The elastic crawler 1A includes an endless belt-like crawler main body (main body) 2 having elasticity. In the present embodiment, the crawler body 2 is made of a rubber material. In the following description, the symbol W is the width direction of the crawler main body 2 (the width direction of the main body) (hereinafter also simply referred to as “width direction”). Reference numeral L denotes a circumferential direction of the crawler body 2 (a circumferential direction of the body) (hereinafter also simply referred to as “circumferential direction”). Further, the symbol D is the thickness direction of the crawler main body 2 (the thickness direction of the main body) (hereinafter also simply referred to as “thickness direction”). Here, the thickness direction is the direction of the perpendicular when the crawler body 2 is extended horizontally.

  Reference numeral 3 denotes a cored bar embedded in the crawler body 2. In the present embodiment, as shown by the broken lines in FIG. 1A, a plurality of core bars 3 are embedded at intervals in the circumferential direction. Each of the core bars 3 is divided into two parts by dividing the crawler main body 2 in the width direction, and a center part 3a disposed on a crawler width center line O2 extending in the circumferential direction of the crawler main body 2 and a width across the center part 3a. A pair of wings 3b extending outward in the direction, and a pair of protrusions 3c are provided in the central part 3a of the cored bar 3 at intervals in the width direction.

  In FIG. 2, reference numeral 4 denotes a main code layer embedded in the crawler body 2. The main cord layer 4 is formed, for example, by arranging a plurality of tensile bodies (for example, steel cords) 4a extending along the circumferential direction at intervals in the width direction. In the present embodiment, the main cord layer 4 is embedded on the outer peripheral surface side (the lower side in the drawing) of the crawler body 2 of the wing portion 3b of the cored bar 3.

  Reference numeral 5 denotes a lug provided on the outer peripheral side of the crawler body 2. The lugs 5 are provided on the outer peripheral side of the crawler body 2 at intervals in the circumferential direction. In the present embodiment, the lug 5 is made of a rubber material. For example, the lug 5 can be vulcanized and bonded to the outer peripheral surface of the crawler main body 2, or can be formed integrally with the crawler main body 2.

  Reference numeral 6 denotes a V-groove provided on the inner peripheral surface 2 f of the crawler main body 2. The V groove 6 is formed by denting the inner peripheral surface 2f of the crawler body 2 into a V shape. In this embodiment, the V-groove 6 extends along the groove width center line O6 of the V-groove 6 as shown in FIG. 1A, and the V-groove 6 of the V-groove 6 as shown in FIG. It has a contour shape that is line-symmetric with respect to the groove width center line O6. Specifically, the groove width center line O6 is a line that bisects the groove width w of the V groove 6 through the groove bottom 6a of the V groove 6, as shown in FIG. The contour shape of each of the two groove side surfaces 6b that are inclined from the groove bottom 6a toward the inner peripheral surface 2f of the crawler body 2 and are connected to the inner peripheral surface 2f is symmetrical with respect to the groove width center line O6. It has a shape.

Preferably, the V-groove 6 has a groove width in the circumferential direction of the crawler body 2 of the V-groove 6 as described below, in the present embodiment, of the groove width component of the groove width w of the V-groove 6. The ratio of the groove width component (hereinafter also referred to as “circumferential groove width”) w1 extending in parallel to the width center line O2 to the groove depth d of the V groove 6 is 2: 1.
1.05: 1 <w: d = 2.05: 1
Here, the circumferential groove width w1 of the V groove 6 is the maximum when the circumferential groove width w1 of the V groove 6 changes in the direction in which the V groove 6 extends (the direction in which the groove width center line O6 extends). Further, the groove depth d means the maximum value when the groove depth d changes in the extending direction of the V-groove 6. As a specific example, the dimensions of the circumferential groove width w1 and the groove depth d are each in the range of 25 to 50% with respect to the rubber thickness from the tensile body 4 to a roller rolling surface 2a described later. FIG. 2 shows the widthwise groove width w2 of the V-groove 6 in the width direction of the crawler body 2.

  As shown in FIG. 1A, the V-groove 6 extends in the width direction of the crawler main body 2 in a plan view of the crawler main body 2. Here, “extending in the width direction of the crawler main body 2” means not only extending in parallel to the width direction of the crawler main body 2 but also extending in an inclined manner with respect to the width direction of the crawler main body 2. Including meaning. In the present embodiment, the V-groove 6 is provided between the cored bars 3 adjacent to each other in the circumferential direction of the crawler body 2. Specifically, the V-groove 6 is formed such that a part of the inner peripheral surface 2f of the crawler main body 2 forms a wheel rolling surface 2a, and the wheel rolling surface 2a is inclined with respect to the width direction of the crawler main body 2. It extends. Further, the V-groove 6 extends over the entire width direction of the wheel rolling surface 2a.

  In the present embodiment, the rolling wheel rolling surface 2a extends along the circumferential direction of the crawler body 2 and is provided by causing a part of the inner circumferential surface 2f of the crawler body 2 to bulge to the inner circumferential side. . In the present embodiment, two rolling wheel rolling surfaces 2 a are provided at intervals in the width direction of the crawler body 2.

  Further, in the present embodiment, the V-groove 6 is provided at a line-symmetrical position with respect to the width center line O2 of the crawler body 2. In the present embodiment, the elastic crawler 1A has two V grooves 6 provided in a line-symmetrical position with respect to the width center line O2 of the crawler main body 2 in the forward direction in the plan view of FIG. It is preferable to wrap around the airframe so as to approach each other. In this case, in the V groove 6? The trapped foreign matter can be discharged to the outside in the width direction of the elastic crawler 1A.

  In addition, in the present embodiment, a first recess 2b in which a part of the inner peripheral surface 2f of the crawler body 2 is recessed along the width direction between the core bars 3 adjacent to each other in the circumferential direction of the crawler body 2. Is provided. Specifically, the first recess 2b extends in the width direction between the width direction outer edge 2a1 of the wheel rolling surface 2a and the width direction outer edge 2e of the crawler body 2. Further, in the present embodiment, an engagement portion 2d to be engaged with a sprocket 20 described later is provided on the inner peripheral surface 2f of the crawler main body 2, and this engagement portion 2d is a part of the inner peripheral surface 2f of the crawler main body 2. Is provided at a position recessed along the width direction. In addition, in this embodiment, the 2nd recessed part 2c which dented a part of inner peripheral surface 2f of the crawler main body 2 along the width direction was provided between the rolling-wheel rolling surface 2a and the engaging part 2d. Yes. Thereby, the crawler main body 2 according to this embodiment is formed between the two widthwise outer edges 2e of the crawler main body 2 formed by the first concave portion 2b, the V groove 6, the second concave portion 2c, and the engaging portion 2d. Extending recesses are provided at intervals in the circumferential direction.

  Like the elastic crawler 1A according to this embodiment, if the V-groove 6 extending in the width direction is provided on the inner peripheral surface 2f of the crawler main body 2 so as to dent the inner peripheral surface 2f, the roller rotation is maximized. When the elastic crawler 1A is wound around the fuselage by narrowing the groove width of the V-groove 6 from the inner peripheral surface of the crawler main body 2 excluding the moving surface 2a toward the roller rolling surface 2a side where the distortion is reduced. In addition, on the inner peripheral surface 2f of the crawler body 2, cracks generated by repeated bending and the occurrence of a wide range of high strain and distortion affecting the bending resistance are not observed, and the bending resistance in the circumferential direction of the crawler body 2 is suppressed. Thus, the entire elastic crawler 1A is easily bent. For this reason, according to elastic crawler 1A concerning this embodiment, the power loss at the time of travel can be reduced, and it can improve a fuel consumption by extension.

  In particular, like the elastic crawler 1A according to the present embodiment, the circumferential groove width w1 of the V groove 6 and the groove depth d of the V groove 6 are defined at a ratio of (1.05 to 2.05): 1. Then, the crack which generate | occur | produces when the surface of the V-groove 6 is bent repeatedly can be suppressed.

  Moreover, in the elastic crawler 1A according to the present embodiment, the crawler body 2 has a plurality of core bars 3 embedded in the crawler body 2 at intervals in the circumferential direction, and is adjacent to the crawler body 2 in the circumferential direction. By providing the V-groove 6 between the metal cores 3, it is possible to suppress cracks that occur due to repeated bending of the surface of the V-groove 6. Also, according to such a configuration, the bending resistance in the circumferential direction of the crawler body 2 is effectively suppressed, and the entire elastic crawler 1A is easily bent easily, so that power loss during traveling is effectively reduced, and consequently Fuel consumption can be improved effectively.

  Further, like the elastic crawler 1A according to the present embodiment, a part of the inner peripheral surface 2f of the crawler body 2 forms a rolling wheel rolling surface 2a, and the rolling wheel rolling surface 2a is inclined with respect to the width direction. If the V-groove 6 extending is provided, the V-groove 6 occupies the contact portion with the wheel or the like of the fuselage as shown in FIG. 2 even if the V-groove 6 is provided in the entire width direction of the wheel rolling surface 2a. The ratio is small. For this reason, even if the rolling wheels of the fuselage are on the V-groove 6, the rolling wheels of the fuselage will not fit into the V-groove 6 or fall as shown in FIG. Therefore, according to the elastic crawler 1 </ b> A according to the present embodiment, while suppressing the bending resistance, the vibration accompanying the vertical movement caused by the rolling wheel or the like of the fuselage fitting or falling into the V groove 6 is also suppressed. be able to. In this case, for example, the V groove 6 is preferably angled with respect to the width direction of the crawler body 2 so that the entire width of the wheel does not coincide with the groove at the same time.

  In particular, as in the elastic crawler 1A according to the present embodiment, if the V-groove 6 provided on the wheel rolling surface 2a is extended over the entire width direction of the wheel rolling surface 2a, the crawler body 2 in the circumferential direction is Bending resistance can be further suppressed.

  Next, in FIG. 3, reference numeral 1B denotes an elastic crawler according to the second embodiment of the present invention. Note that in the following description, substantially the same parts as those of the elastic crawler 1A according to the first embodiment have the same reference numerals, and the description thereof is omitted.

  In the elastic crawler 1B according to the present embodiment, unlike the elastic crawler 1A according to the first embodiment, the V-groove 6 provided on the rolling wheel rolling surface 2a has a width center of the crawler main body 2 in a plan view of FIG. Inclined in the same direction on both the left and right sides across the line O2. When the elastic crawler 1B advances in the downward direction in the figure, the foreign matter caught in the V groove 6 can be selectively discharged in the left direction in the figure.

  Further, in FIG. 4, reference numeral 1C denotes an elastic crawler according to the third embodiment of the present invention. In the following description, parts that are substantially the same as those of the other embodiments have the same reference numerals, and description thereof is omitted.

  In the elastic crawler 1C according to the present embodiment, unlike the other elastic crawlers 1B and 1C, the V-groove 6 provided on the wheel rolling surface 2a of the crawler body 2 protrudes in the circumferential direction in a plan view of FIG. It has a contour shape (extended shape). Specifically, the V-groove 6 has a turning point 6e in the plan view of FIG. 4, and the two extending portions 6c and 6d connected to the turning point 6e approach each other toward the turning point 6e. It is inclined to. More specifically, the two extending portions 6c and 6d of the V groove 6 are each formed as a straight portion. Thereby, the V-groove 6 has a contour shape extending in a V shape in the width direction in a plan view of FIG. 4. In addition, the outline shape of the V groove 6 in planar view of FIG. 4 should just have at least 1 V shape. For this reason, in the elastic crawler 1 </ b> C according to the present embodiment, the V-groove 6 can have a zigzag shape in which a plurality of V-shaped contour shapes are combined along the width direction. The two extending portions 6c and 6d are not limited to straight portions, but can be formed as curved portions.

  Furthermore, in the elastic crawler 1C according to the present embodiment, the V-groove 6 provided on the rolling wheel rolling surface 2a has a center point P2 (in FIG. 4) of the engaging portion 2d of the crawler main body 2 in a plan view of FIG. The reference numeral is attached only to one engaging portion 2d), and is provided at a position to be rotated around the center. In this case, when the elastic crawler 1C is bent, the deformation is different between the turning point 6e of the V-groove 6 and the two extending portions 6c and 6d, so that foreign matter is not easily caught in the V-groove 6.

Next, the elastic crawler device according to the present invention includes the elastic crawler according to the present invention.
For example, an elastic crawler device according to an embodiment of the present invention includes any one of the elastic crawlers 1A to 1C.

  As a specific example, as shown in FIG. 2, at least the elastic crawler 1 </ b> A and the rotating body 10 are included. Specifically, the rotating body 10 is a roller wheel that constitutes an elastic crawler device. The rotating body 10 rolls on a rolling wheel rolling surface 2 a provided in the crawler body 2. Specifically, in the rotating body 10, two rollers 11 are connected via a connecting shaft 12. Thereby, as shown with the broken line of FIG. 2, when driving the elastic crawler 1A, the two rollers 11 roll on the two roller rolling surfaces 2a, respectively.

  Further, in FIG. 2, reference numerals S and I denote sprockets or idlers constituting the elastic crawler device, respectively. In the present embodiment, the sprocket S constitutes a drive wheel for driving the elastic crawler 1 </ b> A. In FIG. 2, the disc-shaped rotating body indicated by reference numeral 21 and the outer peripheral surface of the rotating body 21 are spaced apart in the circumferential direction. It is comprised with the several tooth | gear 22 arrange | positioned and arrange | positioned. The idler I constitutes a driven wheel that rotates following the elastic crawler 1A. In FIG. Specifically, as shown in FIG. 2, the sprocket S has its teeth 21 engaged with an engaging portion 2 d provided on the crawler body 2 to drive the elastic crawler 1 </ b> A, and the idler 20 has its teeth 22. Engages with an engaging portion 2d provided on the crawler body 2 and is driven by the elastic crawler 1A driven by the sprocket S. In FIG. 2, for simplification of the drawing, the sprocket S and the idler I are shown on the same plane, but in actuality, they are arranged at intervals on the front side and the back side of the drawing.

  In the present embodiment, the engaging portion 2d is provided on the width center line O2 of the crawler main body 2 and at a position corresponding to the width direction between the core bars 3 adjacent in the circumferential direction. In the present embodiment, the engaging portion 2d is configured by a through-hole penetrating the crawler main body 2 in the thickness direction. However, the engaging portion 2d may be a recess without penetrating the crawler main body 2 in the thickness direction. Alternatively, the rotating body 10 can roll the rotating body 10 on the wheel rolling surface 2a of the crawler body 2 as a friction wheel that drives the elastic crawler 1A or is driven by the elastic crawler 1A. In this case, the engaging portion 2d of the crawler main body 2 is unnecessary, and the rotating body 10 is a driving wheel, a driven wheel, and a wheel as a friction wheel.

According to the elastic crawler device according to the present embodiment as described above, when the elastic crawler 1A is wound around the machine body, a high strain distribution is not seen on the inner peripheral surface 2f of the crawler main body 2, and the crawler main body 2 Since bending resistance in the circumferential direction is suppressed and the entire elastic crawler 1A is easily bent, power loss during traveling is reduced, and fuel consumption can be improved.
An elastic crawler device in which bending resistance is suppressed can be provided.

  Thus, according to the present invention, it is possible to provide an elastic crawler and an elastic crawler device in which bending resistance is suppressed.

  As shown in FIG. 5, using an elastic crawler modeled by cutting a part of the elastic crawler (hereinafter, also referred to as “analysis model”), distortion generated when the elastic crawler according to the embodiment of the present invention is wound is used. FEM analysis was performed. In the analysis model, the crawler main body was composed of inner and outer peripheral rubbers, and the steel cord was a membrane element constituting the crawler main body. The material properties were assumed as shown in Table 1 below.

In the embodiment of the present invention, the boundary condition in the FEM analysis is that the steel cord at the outer circumferential end of the analysis model is in the y-axis direction (here, the outer peripheral side in the thickness direction of the analysis model is positive (+)). As shown in FIG. 5, the initial condition was a state where the sprocket was in contact with the inner peripheral surface of the analysis model. The analysis of the strain ε was performed under the condition that the sprocket was moved by y = −266.00 mm in the y-axis direction and the analysis model was wound around the sprocket. The sprocket around which the analysis model was wound was modeled as a rigid disk having a diameter φ = 350 mm and a width of 30 mm.
[Example 1]

  In Example 1, as shown in FIG. 6A, the circumferential groove width w1 of the V groove and the groove depth d of the V groove were set to w1 = 20.5 mm and d = 10.0 mm, respectively. The analysis result of the strain distribution is shown in FIG. 6B, and FIGS. 7A and 7B are enlarged views of FIG. 6B.

In FIG. 6B and FIGS. 7A and 7B, the strain distribution is color-coded. Here, the greater the strain ε and the wider the strain ε is distributed, the higher the bending resistance, and the color changes from green → light green → blue green → light blue → blue → dark blue → purple → red. As shown, the strain ε increases. As shown in FIG. 6B, the analysis model of Example 1 does not have a large distortion. Further, as shown in FIGS. 7A and 7B, when the strain ε at the bottom of the V groove at the bending center of the analysis model is locally analyzed, ε = 0.29 and ε = 0.30. there were.
[Example 2]

  In Example 2, as shown in FIG. 8A, the circumferential groove width w1 and the groove depth d of the V groove were set to w1 = 10.5 mm and d = 10.0 mm, respectively. The analysis result of the strain distribution is shown in FIG. 8B, and FIGS. 9A and 9B are enlarged views of FIG. 8B.

As shown in FIG. 8B, in the analysis model of Example 2, the strain ε in the groove region is larger than that in Example 1, but these strains ε greatly affect the bending resistance. Not enough to give. Further, as shown in FIGS. 9A and 9B, when the strain ε of the groove bottom of the V groove at the bending center of the analysis model is locally analyzed, ε = 0.32, ε = 0.39, ε = 0.40 and ε = 0.43.
[Example 3]

  In Example 3, as shown in FIG. 10A, the circumferential groove width w1 and the groove depth d of the V groove were set to w1 = 20.5 mm and d = 20.0 mm, respectively. The analysis result of the strain distribution is shown in FIG. 10B, and FIGS. 11A and 11B are enlarged views of FIG. 10B.

As shown in FIG. 10B, even in the analysis model of Example 3, the strain ε in the groove region is larger than that in Example 1, but these strains ε greatly affect the bending resistance. Not enough to give. Further, as shown in FIGS. 11A and 11B, when the strain ε at the bottom of the V groove at the bending center of the analysis model is locally analyzed, ε = 0.35, ε = 0.46, ε = 0.48 and ε = 0.52.
[Example 4]

  In Example 4, as shown in FIG. 12A, two V grooves are provided between the cored bars. In the two V-grooves, the groove depth d is equal at d = 9.6 mm, respectively, but the circumferential groove width w1 of the V-groove is set such that one is w1 = 10.5 mm and the other is w1 = 13.0 mm. did. The analysis result of the strain distribution is shown in FIG. 12B, and FIGS. 13A and 13B are enlarged views of FIG.

As shown in FIG. 12B, even in the analysis model of Example 3, the strain ε in the groove region is larger than that in Example 1, but these strains ε greatly affect the bending resistance. Not enough to give. Further, as shown in FIGS. 13A and 13B, when the strain ε at the groove bottom of the V groove at the bending center of the analysis model is locally analyzed, ε = 0.38 and ε = 0.39. there were. In Example 4, as shown in FIG. 5C, the two V-grooves are offset in directions in which the respective groove bottoms approach each other with respect to the groove width center line.
[Comparative Example 1]

  In Comparative Example 1, as shown in FIG. 14A, there is no V groove on the inner peripheral surface of the analysis model. The analysis result of the strain distribution is shown in FIG. 14B, and FIGS. 15A and 15B are enlarged views of FIG. 14B.

  As shown in FIG. 14B, even in the analysis model of Comparative Example 1, the strain ε is distributed over a wide range as compared with Examples 1 to 4, and a dark blue region, that is, a region where the strain ε is large. Many. For this reason, compared with Examples 1-4, bending resistance (bending rigidity) is high. As shown in FIGS. 15A and 15B, when the strain ε on the inner peripheral surface of the analysis model is locally analyzed, ε = 0.13, ε = 0.14, ε = 0.28. Met.

  Based on the analysis results described above, the maximum strain in the groove regions of Examples 1 to 4 is shown in Table 2 below.

  From the analysis results described above, it has been clarified that the bending resistance of the elastic crawler is most reduced in Example 1 with the smallest maximum strain, and then becomes Example 2 and Example 3. As compared with Example 4 using two V-grooves, Example 1 clearly shows that the maximum strain is small and the bending resistance of the elastic crawler is further reduced. That is, from the analysis results described above, in order to reduce the bending resistance of the elastic crawler, the concave portion extending in the width direction of the crawler body is formed by a V-groove, and the circumferential groove width w1 of the V-groove is the same as in the first embodiment. Most preferably, the ratio between the maximum value and the maximum value of the groove depth d of the V-groove is 2: 1.

  The above description discloses only some embodiments and examples of the present invention, and various modifications are possible according to the scope of the claims. For example, in each of the above-described embodiments, the elastic crawler according to the present invention has been described as an elastic crawler having a cored bar, but the present invention can be applied to an elastic crawler without a cored bar.

  INDUSTRIAL APPLICABILITY The present invention can be used for an elastic crawler having an endless belt-like main body having elasticity and an elastic crawler device using the same.

  1A to 1C; elastic crawler (first to third embodiments), 2; crawler main body (main body), 2a; rolling wheel rolling surface, 2e; widthwise outer edge of crawler main body, 2f; inner peripheral surface of crawler main body, 3; Core, 4; Main cord layer, 4a; Tensile body, 5; Lug, 6; V groove, 6a; Groove bottom, 6b; Groove side surface, 6c, 6d; Extension part, 6e; Rotating body, 11; Roller, 12; Connecting shaft, 21; Rotating body, 22; Teeth, I; Idler, S; Sprocket, O2; Crawler body width center line, O6; V groove width center line, D; Crawler body thickness direction (main body thickness direction), L: Crawler body circumferential direction (main body circumferential direction), W: Crawler body width direction (main body width direction), d: V groove depth, w ; Groove width of V groove, w1; circumferential groove width of V groove (V groove The groove width in the circumferential direction of the crawler body)

Claims (6)

  An elastic crawler characterized in that a V-groove extending in the width direction of the main body is provided on the inner peripheral surface of an endless belt-like main body having elasticity.   The elastic crawler according to claim 1, wherein a ratio of a groove width in the circumferential direction of the main body of the V groove and a groove depth of the V groove is (1.05 to 2.05): 1.   3. The structure according to claim 1, wherein a plurality of core bars are embedded in the main body at intervals in the circumferential direction of the main body, and the V is disposed between the core bars adjacent to each other in the circumferential direction of the main body. Elastic crawler with grooves.   In any 1 item | term of the Claims 1 thru | or 3, A part of inner peripheral surface of the said main body forms a rolling wheel rolling surface, The said rolling wheel rolling surface extends incline with respect to the width direction of the said main body. An elastic crawler with V-grooves.   The elastic crawler according to claim 4, wherein the V-groove extends over the entire width direction of the main body of the roller rolling surface.   An elastic crawler device comprising the elastic crawler according to claim 1.