阅读说明：本技术 弹性履带 (Elastic crawler belt ) 是由 崔镕宰 于 2021-01-19 设计创作，主要内容包括：本发明公开了一种弹性履带,防止芯骨的横向偏移、转轮的上下振动并实现履带主体在芯骨间的弯曲性的提高。在履带主体(7)内具备在履带转动方向上大致等间隔地埋设的芯骨(8),在芯骨的履带宽度方向上的两侧,具备向履带转动方向上的两侧突出且防止相邻的芯骨彼此在履带宽度方向上的横向偏移的防横向偏移突起(15、16),具备在履带转动方向上的两侧的各防横向偏移突起(15、16)间设置于芯骨上的第1转轮滚动部(21),在履带宽度方向上相邻的各防横向偏移突起(15、16)间,各防横向偏移突起(15、16)具有在履带宽度方向上靠近的防横向偏移部(15a、16a)和在履带宽度方向上分离地设置于该防横向偏移部(15a、16a)上的第2转轮滚动部(15b、16b)。(The invention discloses an elastic crawler belt, which prevents transverse deviation of core bars and vertical vibration of a rotating wheel and improves the bending property of a crawler belt body between the core bars. The crawler belt body (7) is provided with core bars (8) embedded at approximately equal intervals in the rotating direction of the crawler belt, the crawler belt comprises lateral deviation preventing protrusions (15, 16) protruding to both sides in the crawler belt rotating direction and preventing lateral deviation of adjacent core bars in the crawler belt width direction, a 1 st wheel rolling part (21) arranged on the core bars between the lateral deviation preventing protrusions (15, 16) on both sides in the crawler belt rotating direction, between the lateral deviation preventing protrusions (15, 16) adjacent to each other in the track width direction, each lateral deviation preventing protrusion (15, 16) has a lateral deviation preventing portion (15a, 16a) adjacent to each other in the track width direction and a 2 nd wheel rolling portion (15b, 16b) provided separately in the lateral deviation preventing portion (15a, 16a) in the track width direction.)

1. An elastic crawler belt mainly comprises a crawler belt main body made of elastic materials and core bars embedded in the crawler belt main body at approximately equal intervals in the rotating direction of the crawler belt, the core bars are provided with lateral deviation preventing protrusions which protrude to both sides in the track rotating direction and prevent adjacent core bars from deviating laterally in the track width direction, characterized in that the crawler belt comprises a 1 st wheel rolling part, the 1 st wheel rolling part is arranged on the core bar between the lateral deviation preventing protrusions on both sides of the crawler belt in the rotating direction, between the lateral deviation preventing projections adjacent to each other in the track width direction, each lateral deviation preventing projection includes a lateral deviation preventing portion adjacent to each other in the track width direction and a 2 nd reel rolling portion provided separately in the track width direction on the lateral deviation preventing portion.

2. The elastic crawler according to claim 1, wherein at least one of said lateral displacement preventing protrusions adjacent to each other in the crawler width direction is provided with said lateral displacement preventing portion and said 2 nd wheel rolling portion in an L-shaped cross section.

3. The elastic track according to claim 1 or 2, wherein at least the lateral deviation preventing portion of each lateral deviation preventing projection is embedded in the track body.

4. An elastomeric track according to any one of claims 1 to 3, wherein the track body has: a track turning direction 1 st recessed portion formed between the 2 nd rolling portions of the lateral deviation preventing projections adjacent in the track width direction; and a 2 nd recess in the track width direction, which is continuous with the 1 st recess and is formed between the 1 st rolling portion and the 2 nd rolling portion.

5. The elastic crawler according to any one of claims 1 to 5, wherein an upper surface of each 2 nd rolling portion is substantially the same height as or close to an upper surface of the 1 st rolling portion.

6. The elastic crawler according to any one of claims 1 to 6, wherein the 2 nd wheel rolling portion has a protruding length in a crawler rotating direction substantially the same as or shorter than that of the lateral deviation preventing portion.

7. The elastic crawler according to any one of claims 1 to 7, wherein the core includes an engagement portion located between the engagement holes of the crawler body, a guide protrusion protruding from both sides of the engagement portion toward a reverse ground surface side of the crawler body, and a wing portion provided on an outer side in a crawler width direction with respect to the guide protrusion.

Technical Field

The present invention relates to an elastic crawler used for a crawler device of construction machinery or the like.

Background

An elastic crawler used in a crawler device includes a crawler body made of an elastic material such as rubber, cores embedded in the crawler body at substantially equal intervals in a crawler rotation direction, and tensile members embedded in the crawler body in the crawler rotation direction on outer peripheral sides of the cores.

The elastic crawler belt has the following: lateral displacement preventing projections are provided on both sides of the core in the track width direction so as to project toward both sides of the track rotation direction, and when a lateral external force is applied during turning or traveling on an inclined ground, the lateral displacement preventing projections of the adjacent two cores engage with each other in the track width direction so as to prevent the cores from being displaced laterally from each other, and the runner continuously rotates on the runner rolling portion of each core when the track body rolls, with the upper surface of each lateral displacement preventing projection serving as the runner rolling portion (patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 5-345581

The conventional elastic crawler belt has an advantage that it can prevent lateral displacement when the crawler belt is turned or when the crawler belt is driven on an inclined ground, and can prevent vertical vibration of the runner when the crawler belt is rolled. However, since the lateral displacement preventing projections of the two adjacent lugs are in a state of being close to each other in the track width direction, the bending groove cannot be formed between the lateral displacement preventing projections in the engaged state, and there is a disadvantage that the bending property of the track body between the lugs is lowered.

Further, since the entire width of the lateral deviation preventing projection in the track width direction is the runner rolling portion, the lateral deviation preventing projection becomes large in the track thickness direction, and there is a disadvantage that the weight of the entire core including the lateral deviation preventing projection becomes heavy.

In view of the above-described conventional problems, an object of the present invention is to provide an elastic crawler capable of preventing lateral displacement of cores and vertical vibration of a runner and improving the flexibility of a crawler body between the cores.

Disclosure of Invention

The invention is an elastic crawler mainly comprising a crawler body made of an elastic material, and cores embedded in the crawler body at substantially equal intervals in a crawler rotation direction, wherein the cores are provided with lateral displacement preventing protrusions protruding to both sides in the crawler rotation direction on both sides in a crawler width direction and preventing adjacent cores from laterally displacing in the crawler width direction, the elastic crawler belt is provided with a 1 st wheel rolling part, the 1 st wheel rolling part is arranged on the core bar between the lateral deviation preventing protrusions on both sides of the crawler belt in the rotating direction, between the lateral deviation preventing projections adjacent to each other in the track width direction, each lateral deviation preventing projection includes a lateral deviation preventing portion adjacent to each other in the track width direction and a 2 nd reel rolling portion provided separately in the track width direction on the lateral deviation preventing portion.

At least one of the lateral displacement preventing projections adjacent to each other in the track width direction may include the lateral displacement preventing portion and the 2 nd wheel rolling portion in an L-shaped cross section. At least the lateral deviation preventing portion of each lateral deviation preventing protrusion may be embedded in the crawler body.

The crawler main body may include: a track turning direction 1 st recessed portion formed between the 2 nd rolling portions of the lateral deviation preventing projections adjacent in the track width direction; and a 2 nd recess in the track width direction, which is continuous with the 1 st recess and is formed between the 1 st rolling portion and the 2 nd rolling portion. The upper surface of each 2 nd reel rolling unit may be substantially the same height as the upper surface of the 1 st reel rolling unit or may be close to the upper surface of the 1 st reel rolling unit.

The 2 nd wheel rolling portion may have a length of protrusion in the track rotating direction substantially equal to or shorter than that of the lateral deviation preventing portion. The core may include an engaging portion located between the engaging holes of the crawler body, a guide projection projecting from both sides of the engaging portion toward the ground contact surface side of the crawler body, and a wing portion provided on the outer side in the crawler width direction with respect to the guide projection.

The invention has the advantages of preventing transverse deviation of the core bars and vertical vibration of the rotating wheel and improving the bending property of the crawler belt body between the core bars.

Drawings

Fig. 1 is a side view showing a crawler apparatus according to embodiment 1 of the present invention;

FIG. 2 is a perspective view of the elastomeric track;

FIG. 3 is a top view of the elastomeric track;

FIG. 4 is a front cross-sectional view of the elastomeric track;

FIG. 5 is a side cross-sectional view of the elastomeric track;

FIG. 6 is a bottom view of the elastomeric track;

fig. 7 (a) is a plan view of the core bar, and fig. 7 (b) is a front view of the core bar;

FIG. 8 is a perspective view of a mandrel;

fig. 9 is an enlarged sectional view of a main portion;

fig. 10 is a front sectional view showing an elastic crawler of embodiment 2 of the present invention;

fig. 11 is an enlarged sectional view showing a main part of embodiment 3 of the present invention;

fig. 12 is an enlarged sectional view showing a main part of embodiment 4 of the present invention;

fig. 13 is an enlarged sectional view showing a main part of embodiment 5 of the present invention;

fig. 14 is an enlarged sectional view showing a main part of embodiment 6 of the present invention.

Description of the reference numerals

1, a crawler device; 4, an elastic crawler belt; 7, a track body; 8, a core rod; 10, clamping holes; 12, an engaging part; 13, a guide projection; 15. 16, a lateral offset prevention protrusion; 15a, 16a, a lateral deviation preventing portion; 15b, 16b, 2 nd wheel scroll part; 17, a base; 18, diamond top; 19, 3 rd wheel rolling part; 20. 22, the rotating wheel rolls; 21, 1 st wheel rolling part; 23, an inner recess; 24, an outer recess; and 25, connecting the concave parts.

Detailed Description

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Fig. 1 to 9 illustrate embodiment 1 of the present invention. As shown in fig. 1, the crawler device 1 includes a drive wheel 2 and a driven wheel 3 made of sprocket wheels arranged in the front-rear direction, and an elastic crawler belt 4 wound rotatably over the drive wheel 2 and the driven wheel 3, and the elastic crawler belt 4 is guided by a plurality of wheels 5 arranged between the drive wheel 2 and the driven wheel 3.

As shown in fig. 2 to 6, the elastic crawler 4 includes an endless belt-shaped crawler body 7 made of an elastic material such as rubber, crawler width direction (lateral direction) cores 8 embedded in the crawler body 7 at substantially equal intervals in the crawler rotation direction, and tensile members 9 such as steel wires embedded in the crawler body 7 in the crawler rotation direction on the ground contact surface side of each core 8.

In the crawler body 7, an engagement hole 10 is provided between the respective cores 8 at the center in the crawler width direction, and drive blocks 11 are provided on both sides in the crawler width direction on the ground contact surface side. Each of the drive blocks 11 has a shape having a wide portion 11a on the inner side close to the engagement hole 10 and a narrow portion 11b on the outer side far from the engagement hole 10, and is arranged in a zigzag shape on both sides in the track width direction so as to alternately correspond to each of the engagement holes 10 in the track rotation direction.

The core bar 8 is manufactured by casting or forging, and as shown in fig. 7 and 8, includes: an engaging portion 12 disposed between the engaging holes 10 and engaging with the engaging protrusions on the outer peripheries of the drive wheel 2 and the driven wheel 3; guide projections 13 projecting in the track thickness direction from both sides of the engaging portion 12 in the track width direction toward the opposite ground contact surface side, and guiding the drive wheel 2 and the driven wheel 3 from both sides; flat wing portions 14 projecting outward in the track width direction from the respective guide projections 13; and lateral deviation preventing projections 15, 16 projecting from each wing portion 14 to both sides in the track rotating direction.

The guide projection 13 is integrally provided with a base portion 17 and a diamond-shaped apex portion 18 on the base portion 17. The rhombic ceiling portion 18 has substantially parallel side walls 18a and 18b on both the inner and outer sides disposed in a direction substantially orthogonal to the crawler rotation direction, and substantially parallel inclined walls 18c and 18d disposed in a shape inclined obliquely to the side walls 18a and 18b on both sides in the crawler rotation direction, and is formed in a substantially rhombic shape in a plan view.

The diamond-shaped top portion 18 of each core 8 has acute-angled projections 18e and 18f projecting from the base 17 in opposite directions on both sides in the track rotation direction. The top surfaces of the respective rhombic apexes 18 are flat at substantially the same height, and the rhombic apexes 18 serve as a 3 rd rolling part 19 for rolling the wheel 5.

In the two cores 8 adjacent in the track rotating direction, the protrusion portions 18e and 18f overlap each other by the overlap amount a in the track rotating direction, and the diamond-shaped top portions 18 of the guide protrusions 13 are provided with a predetermined interval B so as not to interfere with each other in the track rotating direction even when wound around the drive wheel 2 or the like, in order to form the track rolling path 20 that continues without interruption in the track rotating direction, with respect to the diamond-shaped top portions 18 of the guide protrusions 13.

The wing part 14 between the lateral deviation preventing projections 15, 16 is provided with a 1 st wheel rolling part 21 having a trapezoidal protrusion in a rectangular shape in a plan view. The lateral deviation preventing projections 15 and 16 project from the 1 st wheel rolling portion 21 to both sides in the track rotating direction. One lateral deviation preventing projection 15 of the lateral deviation preventing projections 15 and 16 is located on a side close to the guide projection 13 of the 1 st wheel rolling portion 21, the other lateral deviation preventing projection 16 is located on a side far from the guide projection 13 of the 1 st wheel rolling portion 21, and the lateral deviation preventing projections 15 and 16 of the cores 8 adjacent in the track rotating direction are arranged adjacent to each other in the track width direction.

Each of the lateral deviation preventing projections 15 and 16 is formed in a substantially L-shaped cross section, and integrally includes lateral deviation preventing portions 15a and 16a having a large lateral width in the track width direction, and 2 nd reel rolling portions 15b and 16b arranged on the lateral deviation preventing portions 15a and 16a so as to be deviated to the opposite side in the track width direction.

When the lateral displacement preventing projections 15 and 16 of the adjacent core members 8 are viewed, as shown in fig. 9, the lateral displacement preventing portions 15a and 16a are arranged close to each other at a small interval C in the track width direction, and the 2 nd reel rolling portions 15b and 16b are arranged apart from each other at a large interval D in the track width direction.

The lateral deviation preventing portions 15a, 16a have a slightly longer projecting length than the 2 nd reel rolling portions 15b, 16b, and the projecting end sides thereof overlap in the track rotating direction by a predetermined overlap amount E. The upper surfaces of the 2 nd turning-wheel rolling portions 15b and 16b have substantially the same height as the upper surface of the 1 st turning-wheel rolling portion 21, and the projecting end sides thereof overlap in the track rotating direction by the overlap amount F, and together with the upper surface of the 1 st turning-wheel rolling portion 21, constitute a turning-wheel rolling path 22 that is continuous in the track rotating direction without interruption.

The 2 nd wheel rolling portions 15b and 16b are slightly shorter than the lateral deviation preventing portions 15a and 16a, but may have substantially the same length as the lateral deviation preventing portions 15a and 16 a. The upper surfaces of the 2 nd scroll portions 15b and 16b are preferably substantially the same height as the upper surface of the 1 st scroll portion 21, but may be a height close to the upper surface of the 1 st scroll portion 21, such as slightly higher or lower than the upper surface of the 1 st scroll portion 21, within a range not affecting the vibration of the reel 5.

The lateral deviation preventing portions 15a, 16a are disposed close to each other at a small interval C in the track width direction, and the elastic material of the crawler body 7 is interposed between the lateral deviation preventing portions 15a, 16 a.

The engaging portion 12, the guide projection 13, the 1 st wheel rolling portion 21, and the 2 nd wheel rolling portions 15b and 16b are embedded in the elastic material of the crawler body 7, and a coating layer 26 having a predetermined thickness is formed along the uneven shape of the core 8 on the ground contact surface side of the crawler body 7. The coating layer 26 is formed to be thin along the uneven shape of the core 8, but the coating layer 26 may be omitted to expose the uneven shape of the core 8.

In order to facilitate the bending of the crawler body 7, the crawler body 7 is formed with an inner recess 23, an outer recess 24, and a coupling recess 25 on the ground contact surface side between adjacent cores 8. The inner concave portion 23 is disposed inside the crawler body 7 near the engagement hole 10, and is formed between the engagement hole 10 and the lateral deviation preventing projection 15 while avoiding the guide projection 13. The outer recess 24 is formed in the track width direction on the outer side of the lateral deviation preventing projection 16 of the track body 7.

The coupling recess 25 couples the inner recess 23 and the outer recess 24, and is formed in a curved shape between the 1 st rolling element 21 and the 2 nd rolling elements 15b and 16b of the lateral deviation preventing projections 15 and 16. The coupling recess 25 includes: a 1 st recess 25a formed between the 2 nd rolling contact portions 15b, 16b of the lateral deviation preventing projections 15, 16 in the track rotating direction; and a 2 nd recessed portion 25b continuous with both sides of the 1 st recessed portion 25a and formed between the 1 st rolling portion 21 and the 2 nd rolling portions 15b, 16b in the track width direction.

The track 5 integrally includes a small-diameter wheel portion 5a disposed on the center side in the track width direction and a large-diameter wheel portion 5b disposed on the outer side of each small-diameter wheel portion 5a, and the small-diameter wheel portion 5a rolls in the track turning direction on the 3 rd track rolling portion 19 on the guide projection 13, and the large-diameter wheel portion 5b rolls in the track turning direction on the 1 st track rolling portion 21 and the 2 nd track rolling portions 15b, 16 b.

The elastic crawler 4 thus constructed has the following advantages. The crawler belt body 7 is rotated in forward and backward directions by the driving of the driving wheel 2 while being guided by the turning wheels 5 in a state of being wound around the driving wheel 2 and the driven wheel 3.

When this crawler body 7 rotates, the small diameter wheel portions 5a of the runner 5 roll in the crawler rotation direction on the runner rolling path 20 formed by the 3 rd runner rolling portion 19, and the large diameter wheel portions 5b roll in the crawler rotation direction on the runner rolling path 22 formed by the 1 st runner rolling portion 21, the 2 nd runner rolling portions 15b, 16b, so that the crawler body 7 can be guided by the runners 5 at 4 locations in the crawler width direction. Further, since the 4-position roller rolling paths 20 and 22 are continuous in the track rotating direction at substantially the same height between the adjacent cores 8 without interruption, the vertical vibration when the rollers 5 roll can be reduced.

That is, the guide protrusions 13 of the respective cores 8 are at the same height, and with respect to the 3 rd rolling portion 19 on the guide protrusion 13, in the adjacent cores 8, both end sides of the 3 rd rolling portion 19 overlap in the track rotating direction by the overlap amount a in a side view, so that the small diameter wheel portion 5a can stably roll on the 2 wheel rolling paths 20 formed by the 3 rd rolling portion 19 on the inner side in the track width direction without vertical vibration.

Further, since the 1 st rolling part 21 of the core 8 and the 2 nd rolling parts 15b, 16b are substantially at the same height and the 2 nd rolling parts 15b, 16b of the respective cores 8 overlap in the track turning direction by the overlap amount F in side view, the large-diameter wheel part 5b can stably roll on the 2 track rolling paths 22 formed outside the 1 st rolling part 21 and the 2 nd rolling parts 15b, 16b of the respective cores 8 in the track width direction without vertical vibration.

Since the lateral deviation preventing projections 15 and 16 are projected from the respective cores 8 on both sides in the track running direction and the lateral deviation preventing portions 15a and 16a of the lateral deviation preventing projections 15 and 16 are in a state of being close to each other in the track width direction at a small interval C through the elastic material, the lateral deviation preventing portions 15a and 16a of the lateral deviation preventing projections 15 and 16 can be engaged with each other to prevent lateral deviation of the adjacent cores 8 even when the cores 8 receive a lateral external force.

Further, since the lateral deviation preventing portions 15a and 16a are longer than the 2 nd wheel rolling portions 15b and 16b, even when the relative angle between the two adjacent mandrels 8 changes due to bending of the crawler body 7 or the like, the engagement amount of the lateral deviation preventing portions 15a and 16a can be sufficiently secured, and the surface pressure between the lateral deviation preventing portions 15a and 16a can be suppressed to be low.

Since the crawler body 7 has the recesses 23 to 25 continuous in the crawler width direction between the cores 8 on the ground contact surface side opposite to the crawler body 7, the flexibility of the crawler body 7 between the cores 8 can be easily ensured. For example, not only the inner concave portion 23 and the outer concave portion 24 are provided between the adjacent two cores 8, but also the connecting concave portion 25 connecting the inner concave portion 23 and the outer concave portion 24 is provided between the 1 st rolling portion 21 of one core 8 and the lateral deviation preventing protrusions 15 and 16 of the other core 8, so that the bendability of the crawler body 7 between the 1 st rolling portion 21 and the lateral deviation preventing protrusions 15 and 16 can be improved.

Further, the lateral deviation preventing portions 15a, 16a of the lateral deviation preventing projections 15, 16 are in a state of being close to each other in the track width direction, but in addition to the 2 nd recessed portion 25b between the 1 st reel rolling portion 21 and the 2 nd reel rolling portions 15b, 16b, the 2 nd reel rolling portions 15b, 16b on the lateral deviation preventing portions 15a, 16a are also deviated in the track width direction from the lateral deviation preventing portions 15a, 16a, an interval in the track width direction is provided between the 2 nd reel rolling portions 15b, 16b, and the 1 st recessed portion 25a is provided in this portion, so that the track main body 7 can be easily bent also in these portions.

Therefore, although the 2 nd wheel rolling portions 15b and 16b are configured to prevent the vertical vibration of the wheel 5 by the overlap amount F in the track turning direction in a side view, the bendability of the track body 7 between the cores 8 can be improved.

Further, since the lateral deviation preventing projections 15 and 16 have the L-shaped cross section in which the upper 2 nd rolling contact portions 15b and 16b are eccentric in the track width direction with respect to the lower lateral deviation preventing portions 15a and 16a, the 1 st recessed portion 25a can be easily disposed between the 2 nd rolling contact portions 15b and 16b, and the weight of the entire core 8 including the lateral deviation preventing projections 15 and 16 can be reduced. Further, the lateral deviation preventing protrusions 15, 16 have lateral deviation preventing portions 15a, 16a and 2 nd reel rolling portions 15b, 16b, and thus have an effect of reinforcing each other.

Fig. 10 illustrates embodiment 2 of the present invention. In this embodiment, the jog dial 5 includes large diameter wheel portions 5b at both ends of the small diameter body portion 5c, and the large diameter wheel portions 5b are configured to scroll on the 1 st jog dial rolling portion 21 and the 2 nd jog dial rolling portions 15b and 16 b. The track body 7 and the core bar 8 on the elastic track 4 side are configured in the same manner as in embodiment 1.

In this way, the turning wheel 5 can be configured such that the large-diameter wheel portions 5b at both ends roll on the 2 turning wheel rolling paths 22 formed by the 1 st turning wheel rolling portion 21 and the 2 nd turning wheel rolling portions 15b and 16 b. At this time, since the large-diameter wheel portions 5b at both ends of the runner 5 roll on the 2 runner rolling paths 22 on the outer side in the track width direction of the crawler body 7, the floating of the crawler body 7 can be prevented by the runner 5 at the 2 outer positions in the track width direction.

Further, since only the runner 5 having the large-diameter wheel portions 5b at both ends is used and the configuration of the elastic crawler 4 including the crawler body 7, the core 8, and the like is the same as that of embodiment 1, it is possible to suppress vertical vibration of the runner 5 and secure the flexibility of the crawler body 7, and the like, and the same effects as those of embodiment 1 can be obtained.

While embodiment 1 uses a wheel 5 having a small diameter wheel portion 5a and a large diameter wheel portion 5b, embodiment 2 uses a wheel 5 having a large diameter wheel portion 5b, and both are different from each other only in this point, so that the elastic crawler 4 can be used in common in each embodiment. As a result, the versatility of the elastic crawler belt 4 is improved, and the manufacturing cost can be reduced.

The elastic crawler 4 according to embodiment 2 is configured in the same manner as embodiment 1, but the top surface of the guide projection 13 does not need to be flat, and the shape thereof can be arbitrarily configured.

Fig. 11 illustrates embodiment 3 of the present invention. In this embodiment, the 2 nd wheel rolling portions 15b and 16b of the lateral deviation preventing projections 15 and 16 are configured to be exposed from the reverse ground contact surface side of the crawler belt body 7. Even when the 2 nd wheel rolling portions 15b and 16b are exposed as described above, vertical vibration of the wheel 5 is prevented, and the flexibility of the crawler body 7 is ensured.

Fig. 12 illustrates embodiment 4 of the present invention. In this embodiment, of the two lateral displacement preventing projections 15, 16 adjacent to each other in the track width direction, one lateral displacement preventing projection 15 is formed in a rectangular shape in cross section, and the other lateral displacement preventing projection 16 is formed in an L-shape in cross section. In this case, the 2 nd reel rolling parts 15b and 16b on the upper sides of the lateral deviation preventing parts 15a and 16a can be separated in the track width direction.

Fig. 13 illustrates embodiment 5 of the present invention. In this embodiment, the notch portions 15c and 16c are provided by, for example, inclining the opposing sides of the 2 nd rolling portions 15b and 16b on the lateral deviation preventing portions 15a and 16a of the lateral deviation preventing projections 15 and 16, and the 2 nd rolling portions 15b and 16b are separated in the track width direction. In this way, the lateral deviation preventing projections 15 and 16 can be provided with the notches 15c and 16 c. Therefore, the shape of the lateral deviation preventing projections 15 and 16 can be variously changed in this manner, and is not limited to the L-shaped cross section.

Fig. 14 illustrates embodiment 6 of the present invention. In this embodiment, one drive block 11 is disposed across two cores 8 adjacent in the track rotation direction with respect to the drive block 11 on the ground contact surface side of the track main body 7. The drive blocks 11 are arranged symmetrically left and right. The drive block 11 may be configured as such. Therefore, the arrangement of the drive blocks 11 and the like can be arbitrarily changed.

While the embodiments of the present invention have been described above in detail, the present invention is not limited to the embodiments, and various modifications can be made. For example, in the embodiment, the drive blocks 11 constituting the left and right block rows are provided on the ground contact surface side of the outer periphery of the crawler body 7, but the shape, structure, and arrangement of the drive blocks 11 can be arbitrarily changed.

In the case where the runner rolling portions 15b, 16b, and 21 are provided on both sides in the track width direction, the runners 5 rolling on the runner rolling portions 15b, 16b, and 21 on both sides may be configured separately in the track width direction. The lateral deviation preventing projections 15 and 16 may have a structure in which the interval between the 2 nd reel rolling parts 15b and 16b is larger than the interval between the lateral deviation preventing parts 15a and 16 a.

Preferably, in the crawler body 7, a 1 st recessed portion 25a is formed in the crawler rotation direction between the 2 nd rolling portions 15b, 16b of the lateral deviation preventing projections 15, 16 adjacent in the crawler width direction, and a 2 nd recessed portion 25b is formed in the crawler width direction between the 1 st rolling portion 21 and the tip end sides of the 2 nd rolling portions 15b, 16b, but the 1 st recessed portion 25a and the 2 nd recessed portion 25b may be omitted.