WO2020209183A1

WO2020209183A1 - Crawler

Info

Publication number: WO2020209183A1
Application number: PCT/JP2020/015245
Authority: WO
Inventors: 近藤　智
Original assignee: 株式会社ブリヂストン
Priority date: 2019-04-08
Filing date: 2020-04-02
Publication date: 2020-10-15
Also published as: JP2020172131A

Abstract

This crawler is provided with: a crawler main body in the shape of an endless body, formed from a resilient material and wound around a wheel; and a plurality of lugs which project from an outer peripheral surface of the crawler main body, extend in the width direction of the crawler main body, are provided spaced apart in the perimetrical direction R of the crawler main body, and in which protruding portions are formed protruding toward the front in the direction of forward rotation of the crawler main body.

Description

Crawler

The present disclosure relates to crawlers formed using elastic materials.

In Japanese Patent Application Laid-Open No. 2007-230266, a lug extending in the circumferential direction of the crawler and extending in the crawler width direction is provided on the outer peripheral surface of the crawler body having an endless band shape on one side in the crawler width direction with the center line of the crawler body in between. Disclosed are crawlers that are distributed to the other side and alternately arranged in the circumferential direction of the crawler, and are arranged on the one side and the other side in the direction opposite to the circumferential direction of the lug crawler.

By the way, the crawler of the above document has a function of transmitting a driving force to the soil, and the crawler has lugs formed linearly in the width direction of the crawler or sandwiching the center of the crawler. Both sides in the crawler width direction are formed in opposite directions in the circumferential direction.
In this case, there is room for improving the traction performance of the crawler when traveling on rough terrain.

The purpose of this disclosure is to provide a crawler with improved traction performance when traveling on rough terrain.

The crawler according to the present disclosure has an endless crawler body formed of an elastic material and wound around a wheel, and projects on the outer peripheral surface of the crawler body, extends in the width direction of the crawler body, and extends in the circumferential direction of the crawler body. The crawler body is provided with a plurality of lugs at intervals, and a lug is formed which projects forward in the forward rotation direction of the crawler body.

According to this crawler, compared to a structure in which lugs are formed linearly in the width direction of the crawler, or a structure in which lugs are formed in opposite directions in the circumferential direction on both sides in the crawler width direction with the center of the crawler in between. , The traction performance of the crawler is improved.

As described above, according to the crawler of the present disclosure, the effect of improving the traction performance can be obtained when traveling on rough terrain.

It is a side view which saw the crawler of one Embodiment of this disclosure from the side (crawler width direction). It is a top view which looked at the crawler in 1st Embodiment of this disclosure from the outer peripheral side of the crawler. It is a side sectional view of the crawler seen from the side (crawler width direction) in the state of traveling on the illegal ground of the crawler in the first embodiment of the present disclosure. It is a top view which looked at the crawler in the 2nd Embodiment of this disclosure from the crawler outer peripheral side. It is a perspective view seen from diagonally above front of the crawler of FIG. 4 in the forward rotation direction of the crawler. FIG. 6 is a perspective view of the crawler of FIG. 4 seen from above diagonally forward in the forward rotation direction of the crawler. It is a top view which shows the flow direction of earth and sand with respect to the groove part in the crawler of FIG. It is a top view which shows the passing surface of the rolling wheel in the crawler of FIG.

<First Embodiment>
Hereinafter, the crawler according to the embodiment of the present disclosure will be described.
As shown in FIG. 1, the endless crawler 10 as the crawler according to the embodiment of the present disclosure is a type of crawler having a core metal described later, and a rotation direction is specified.

[Crawler]
The crawler 10 is formed of an elastic material and protrudes from an endless crawler body 12 wound around a wheel and an outer peripheral surface 12B of the crawler body 12, extending in the width direction W of the crawler body 12 and in the circumferential direction of the crawler body 12. A plurality of lugs 18 are provided on the R at intervals.
The crawler 10 is used by being wound around a drive wheel 100 connected to a drive shaft of a crawler vehicle as an airframe (not shown) and a floating wheel 102 rotatably attached to the crawler vehicle. Further, a plurality of rolling wheels 104 arranged between the driving wheels 100 and the idler wheels 102 and rotatably attached to the crawler vehicle roll on the inner circumference of the crawler 10.

In the present embodiment, the crawler 10 is wound around the drive wheel 100 and the idle wheel 102, but the present disclosure is not limited to this configuration. For example, depending on the arrangement of the drive wheels 100, the floating wheels 102, and the rolling wheels 104, the crawler 10 may be wound around one or a plurality of rolling wheels 104 in addition to the driving wheels 100 and the floating wheels 102.
Further, in the present embodiment, the crawler 10 has a dimension of 400 mm in the width direction W as an example.

Further, the crawler traveling device 90 (see FIG. 1) as a traveling portion of the crawler vehicle is configured by the driving wheels 100, the floating wheels 102, the rolling wheels 104, and the crawler 10 wound around them.

As shown in FIG. 1, the drive wheel 100 has a pair of disk-shaped wheel portions 100A connected to the drive shaft of the crawler wheel. In these wheel portions 100A, the outer peripheral surface 100B comes into contact with the wheel rolling surface 16 of the crawler main body 12, which will be described later, and rolls on the wheel rolling surface 16. The drive wheel 100 causes a driving force from the crawler vehicle to act on the crawler 10 (details will be described later), and circulates the crawler 10 between the drive wheel 100 and the idle wheel 102.

The floating wheel 102 has a pair of disk-shaped wheel portions 102A that are rotatably attached to the crawler vehicle. In these wheel portions 102A, the outer peripheral surface 102B comes into contact with the wheel rolling surface 16 and rolls on the wheel rolling surface 16. Further, the idler wheel 102 is moved in a direction away from the drive wheel 100 by a pressurizing mechanism such as hydraulic pressure provided on the crawler vehicle side (not shown) and pressed against the wheel rolling surface 16. By pressing the idler wheel 102 against the wheel rolling surface 16 in this way, the tension of the crawler 10 wound around the drive wheel 100 and the idler wheel 102 is maintained.

The rolling wheel 104 has a pair of disk-shaped wheel portions 104A that are rotatably attached to the crawler wheel. In these wheel portions 104A, the outer peripheral surface 104B comes into contact with the wheel rolling surface 16 and rolls on the wheel rolling surface 16. The weight of the crawler wheel is supported by the wheels 104.
The idle wheel 102 and the rolling wheel 104 are driven to rotate with respect to the crawler 10 circulating between the drive wheel 100 and the idle wheel 102.

Here, the crawler 10 (crawler body 12) is wound around the drive wheel 100 and the idle wheel 102 with a predetermined tension, and a sprocket (not shown) is used in combination with the drive wheel 100 so that the teeth of the sprocket become the crawler body. The driving force of the drive wheels 100 is transmitted to the crawler 10 by engaging with the recesses on the inner peripheral surface of the crawler that do not reach the outer peripheral surface of the crawler, and the crawler 10 circulates between the drive wheels 100 and the idler wheels 102. Then, the crawler car runs.

[Crawler body]
As shown in FIG. 1, the crawler 10 has a crawler body 12 in which a rubber material as an example of an elastic material is formed in an endless band shape. The crawler body 12 of the present embodiment is an example of the endless band-shaped crawler body of the present disclosure.
Further, as shown in FIG. 2, the crawler main body 12 is provided with a core metal 12S inside. Specifically, the core metal 12S is a plate-shaped member that extends within the range of one end side and the other end side of the width direction W of the crawler body 12 and has a predetermined dimension in the circumferential direction R of the crawler body 12. is there.
Further, the core metal 12S is embedded inside the crawler main body 12 at a predetermined pitch in the circumferential direction R of the crawler main body 12 at intervals.

Further, as shown in FIG. 1, a plurality of rubber protrusions 14 projecting from the inner peripheral surface 12A to the inner peripheral side of the crawler are formed on the crawler main body 12 at intervals in the circumferential direction R of the crawler 10. The rubber protrusion 14 is arranged on the center line CL passing through the center of the crawler body 12 in the crawler width direction. Further, the rubber protrusion 14 limits the movement of the wheel in the crawler width direction by contacting the wheel (pointing to the drive wheel 100, the floating wheel 102, and the rolling wheel 104) that rolls on the wheel rolling surface 16. .. In other words, the rubber protrusion 14 can suppress the relative movement of the crawler 10 and the wheel in the crawler width direction by abutting against the wheel, that is, the lateral displacement of the crawler 10 with respect to the wheel can be suppressed.
In the present embodiment, the rubber protrusion 14 is arranged on the crawler body 12 so that the center of the rubber protrusion 14 in the crawler width direction is located on the center line CL, but the present disclosure is not limited to this configuration. The rubber protrusion 14 may be arranged on the crawler body 12 so that a part of the rubber protrusion 14 is located on the center line CL. For example, the center of the rubber protrusion 14 in the crawler width direction may be deviated to one side or the other side in the crawler width direction with respect to the center line CL.

Further, wheel rolling surfaces 16 extending along the circumferential direction R of the crawler 10 are formed on both outer sides in the crawler width direction with the rubber protrusions 14 of the crawler body 12 interposed therebetween. The wheel rolling surface 16 is flattened and forms a part of the inner peripheral surface 12A of the crawler body 12.
In the present embodiment, the inner peripheral surface 12A of the crawler main body 12 has a configuration in which the surface between the rubber protrusions 14 and the wheel rolling surface 16 are flush with each other (here, the same height). It is not limited to this configuration. For example, the wheel rolling surface 16 may be raised on the inner peripheral side of the crawler with respect to the surface between the rubber protrusions 14, or may be recessed on the outer peripheral side of the crawler (a recessed portion is provided).

[Lag]
As shown in FIGS. 1 and 2, the crawler main body 12 is provided with a plurality of lugs 18 protruding from the outer peripheral surface 12B toward the outer peripheral side of the crawler.
The lug 18 includes a base portion 18A, a tip portion 18B, a front side surface 18F1 facing forward in the forward rotation direction F of the crawler 10, a rear side surface 18R1 facing rearward in the forward rotation direction F of the crawler 10, and these base portions 18A. The top surface 18C surrounded by the tip portion 18B, the front side surface 18F1, and the rear side surface 18R1 is included.
Here, the forward rotation direction F is the direction in which the crawler 10 rotates when the crawler vehicle advances.
Further, the front side surface 18F1 is in front of the lug 18 in the forward rotation direction F, rises from the outer peripheral surface 12B of the crawler 10, and is formed between the top surface 18C. Further, the rear side surface 18R1 is rearward of the lug 18 in the forward rotation direction F, rises from the outer peripheral surface 12B of the crawler 10, and is formed between the top surface 18C.

Further, a shallow groove portion 18D is formed on the top surface 18C on the side of the lug 18 near the base portion 18A. The shallow groove portion 18D is a groove opened to the front side surface 18F1 and the rear side surface 18R1 along the circumferential direction R when viewed from the side of the outer peripheral surface 12B of the crawler 10. Further, the shallow groove portion 18D is curved and widened toward the front and the rear in the circumferential direction R.

Further, the lugs 18 project from the outer peripheral surface 12B of the crawler main body 12, extend in the width direction W of the crawler main body 12, and are provided in plurality in the circumferential direction R of the crawler main body 12 at intervals, and are provided in a plurality of directions in the forward rotation direction of the crawler main body 12. A convex portion 18T that protrudes toward the front of F is formed.

The convex portion 18T projects forward on the outer peripheral surface 12B side and the top surface 18C of the crawler body 12 of the lug 18 in the forward rotation direction F of the crawler 10, and in the present embodiment, as an example, the width direction W of the crawler 10 It has a convex side surface 18F2 formed along the direction.
In other words, the convex portion side surface 18F2 of the convex portion 18T is formed in the forward rotation direction F of the crawler 10, that is, the direction intersecting the center line CL of the crawler 10. In the present embodiment, the convex side surface 18F2 is formed in a direction orthogonal to the center line CL of the crawler 10 as an example.

Further, the convex portion 18T is formed at the central portion of the crawler body 12 of the lug 18 in the width direction W. The traction performance of the crawler 10 is improved as compared with a structure in which a lug in which the convex portion 18T faces in the forward direction with respect to the circumferential direction and a lug in which the convex portion 18T faces in the opposite direction are mixed.
Here, the central portion is a region predetermined in the width direction W with respect to the central line CL of the crawler 10. In the present embodiment, as an example, a region W1 corresponding to the pair of wheel rolling surfaces 16 shown in FIG. 2 is included, and the range sandwiched between the pair of regions W1 is referred to.

Further, the convex portion 18T is formed at a position closer to the center line CL than one end 12C (the other end 12D). In the present embodiment, the convex portion 18T is formed at a position straddling the center line CL as an example. Further, the convex portion 18T may be formed in the region W1 corresponding to the wheel rolling surface 16 shown in FIG. At that time, the convex portions 18T formed on the lugs 18 adjacent to each other in the circumferential direction R may be formed alternately in the circumferential direction R.

Further, the lug 18 has a base 18A formed at one end 12C (the other end 12D) of the crawler body 12 in the width direction W and the other end 12D of the crawler body 12 in the width direction W when viewed from the outer peripheral side of the crawler body 12. The lugs 18 having the tip portion 18B formed on the surface and adjacent to each other in the circumferential direction R are arranged in opposite directions in the width direction W. As a result, the followability of the lugs 18 to rough terrain is improved as compared with the structure in which the lugs adjacent to each other in the circumferential direction are arranged in the same direction in the width direction.

In the present embodiment, as an example, the base portions 18A and the tip portions 18B of the lugs 18 adjacent to each other in the circumferential direction R of the crawler 10 are alternately arranged with respect to the circumferential direction R of the crawler main body 12.
In this case, as shown in FIG. 2, the lug 18 is arranged at a position corresponding to the core metal 12S. In the present embodiment, as an example, the base portion 18A and the tip portion 18B of the lug 18 are arranged at positions corresponding to both ends of the crawler body 12 of the core metal 12S in the width direction W, and the convex portions 18T of the lug 18 are the cores. It is arranged at a position close to the core metal 12S arranged in front of the gold 12S in the forward rotation direction F.

Most of the lug 18 and the core metal 12S need only be provided at corresponding positions, and it is allowed that the lug 18 and the core metal 12S are arranged slightly offset from each other in the forward rotation direction F. Here, "corresponding" means that the lug 18 and the core metal 12S have a range in which they overlap each other. In other words, the lug 18 and the core metal 12S have portions that overlap each other when viewed from the outer peripheral surface 12B side of the crawler main body 12.
For example, the convex portion 18T may be arranged so as to overlap another core metal 12S arranged in front of the forward rotation direction F. In other words, in the lug 18, the portion including the base portion 18A and the tip portion 18B and the portion including the convex portion 18T may be arranged so as to straddle the two core metal 12S adjacent to each other in the circumferential direction R.
Further, in the present embodiment, the dimension of the crawler 10 in the width direction W is 400 mm. For example, when the dimension is 450 mm, the dimension of the lug 18 in the circumferential direction R is set narrower than that of the 400 mm. In this case, if necessary, the dimensions of the core metal 12S and the setting such as narrowing the arrangement pitch may be changed.

Further, as shown in FIG. 3, the front side surface 18F1 facing the front of the lug 18 is entirely inclined rearward with respect to the perpendicular line P on the outer peripheral surface 12B of the crawler body 12, and the convex portion side surface 18F2 on the convex portion 18T. Is set to have a larger inclination angle θ1 than both side surfaces 18F3 located on both sides of the crawler body 12 of the convex side surface 18F2 in the width direction W.
Here, the side surface 18F3 on both sides is an example of another side surface.

Specifically, the backward inclination angle θ1 of the convex side surface 18F2 with respect to the vertical line P is larger than the backward inclination angle θ2 of the side surface 18F3 with respect to the vertical line P.
In other words, the length of the convex side surface 18F2 in the protruding direction H is longer than the length of the side surface 18F3 on both sides in the protruding direction H. As a result, the amount of biting into the rough terrain of the convex portion 18T is increased as compared with the structure in which the inclination angle of the side surface of the convex portion is the same as the inclination angle of the other side surfaces located on both sides in the width direction of the crawler body of the side surface. To do.

Further, as shown in FIG. 2, in the forward rotation direction F of the lug 18, a concave portion 18U facing the rear is formed behind the convex portion 18T when viewed from the outer peripheral side of the crawler main body 12.

Specifically, the recess 18U is formed at a position close to the center line CL, and is formed so as to face the convex portion 18T of the lug 18 adjacent to the crawler 10 in the circumferential direction R. In the present embodiment, as an example, it is formed at a position straddling the center line CL. As a result, the earth and sand sandwiched between the lugs 18 adjacent to each other in the circumferential direction are compressed and the shearing force is increased as compared with the structure in which the rear portion is formed in a straight line behind the convex portion.
Further, the concave portion 18U includes a structure formed at a position corresponding to each pair of

wheel portions

100A and 102A of the drive wheel 100 and the idle wheel 102 as wheels, similarly to the convex portion 18T.

(Action in this embodiment)
The operation in the first embodiment will be described with reference to FIG.
As shown in FIG. 3, the crawler 10 rotates in the forward rotation direction F when traveling on the soil surface G. At this time, in the crawler 10, the lug 18 bites into the soil surface G, the earth and sand G1 is compressed by the outer peripheral surface 12B of the crawler 10 and the adjacent lug 18, and a shearing force is generated in the earth and sand G1 to obtain traction.
Hereinafter, this state will be described as the action of the lag 18.

[Comparison example]
First, a comparative example will be described.
In the crawler of the comparative example, the lugs are formed linearly in the width direction of the crawler, or curved on both sides in the crawler width direction with the center line of the crawler in between, and are formed in opposite directions in the circumferential direction R, respectively. Suppose.
In this configuration, when the crawler is run, in a structure in which the lugs are formed linearly in the width direction of the crawler, the linear lugs in contact with the soil surface G contact uniformly in the width direction of the crawler. , The crawler's traction performance is not improved because it cannot bite into the soil surface G significantly.
Further, in a structure in which the lugs are curved on both sides in the width direction of the crawler with the center line of the crawler in between and formed in opposite directions to the circumferential direction R, the bending direction of the lug itself is left and right in the width direction of the crawler. Since the lugs are formed in opposite directions, the lugs that are curved so as to be convex in the direction opposite to the forward rotation direction F of the crawler are compared with the lugs that are curved so as to be convex in the forward rotation direction F of the crawler. Further improvement in traction performance cannot be expected in the rotation of the crawler in the forward rotation direction F.

On the other hand, in the crawler of the present embodiment, the crawler 10 rotates in the forward rotation direction F, and among the plurality of lugs 18, the lug 18 in contact with the soil surface G has the convex portion 18T of the lug 18 biting into the soil surface G. .. Specifically, the convex side surface 18F2 of the convex portion 18T begins to bite into the soil surface G, and the side surface 18F3 on both sides gradually bites into the soil surface G following the convex side surface 18F2. This is because, as shown in FIG. 3, the convex portion 18T bites into the soil surface G at an earlier timing than the portion where the convex portion 18T is not formed. In other words, the convex side surface 18F2 comes into contact with the soil surface G at an earlier timing than the bilateral side surfaces 18F3.

Further, the convex side surface 18F2 of the convex portion 18T of the lug 18 is set to have a larger inclination angle θ1 than the both side surfaces 18F3 located on both sides of the crawler body 12 of the convex side surface 18F2 in the width direction W. Specifically, the backward inclination angle θ1 of the convex side surface 18F2 with respect to the vertical line P is larger than the backward inclination angle θ2 of the side surface 18F3 with respect to the vertical line P.

As a result, the depth of penetration of the rug 18 with respect to the soil surface G is increased, so that the traction performance of the crawler is improved.
In other words, the lug 18 that bites into the soil surface G compresses the earth and sand with the adjacent rug 18 in front of the crawler 10 in the forward rotation direction F on the soil surface G, and the shearing force of the compressed earth and sand causes the rug 18 to compress the earth and sand. , Crawler traction performance is improved.

<Second Embodiment>
Next, the second embodiment will be described with reference to FIGS. 1 and 4 to 8.
The crawler 10A in the second embodiment has a different shape and arrangement of lugs provided on the crawler body 12. In the crawler 10A, the same configuration as that of the first embodiment will be described with the same reference numerals.

[Lag]
As shown in FIG. 4, in the crawler 10A in the second embodiment, the lug is arranged at one end 12C (the other end 12D) of the crawler body 12 in the width direction W when viewed from the outer peripheral side of the crawler body 12. It is arranged between the base portion 181A, the first tip portion 181B extending from the first base portion 181A across the center line CL passing through the center of the crawler body 12 and becoming the tip, and between the first base portion 181A and the first tip portion 181B. The first lug 181 on which the convex portion 181T is formed, the second base portion 182A arranged at the other end of the width direction W of the crawler main body 12, and the center line passing through the center of the crawler main body 12 from the second base portion 182A. A second tip portion 182B extending in a range on the other end side of the CL and forming a tip thereof is provided with a second lug 182, and the first lug 181 and the second lug 182 are the crawler main body 12 A plurality of crawler bodies 12 are provided at intervals in the circumferential direction R, and the first tip portion 181B and the second tip portion 182B are arranged to face each other in the width direction W in the width direction W of the crawler body 12.
As a result, as compared with the structure in which the tip of the first lug and the tip of the second lug are arranged so as to be offset in the circumferential direction of the crawler body, the earth and sand sandwiched between the adjacent lugs in the width direction of the crawler 10A is separated. It is compressed and the shear force is increased.

Further, the front side surface 181F1 of the crawler 10A facing the front of the first lug 181 is inclined rearward with respect to the perpendicular line P on the outer peripheral surface 12B of the crawler body 12, as in the first embodiment, and the convex portion 181T The convex side surface 181F2 is set to have a larger inclination angle θ than the both side surfaces 181F3 located on both sides of the crawler body 12 in the width direction of the convex side surface 181F2 (see FIG. 3). Specifically, the backward inclination angle θ1 of the convex side surface 181F2 with respect to the vertical line P is larger than the backward inclination angle θ2 of the side surface 181F3 on both sides with respect to the vertical line P. As a result, the amount of bite into the rough terrain of the convex portion 181T is increased as compared with the structure in which the inclination angle of the side surface of the convex portion is the same as the inclination angle of the other side surfaces located on both sides of the crawler body in the width direction. It is designed to do.
Here, the front side surface 181F1 is an example of a side surface facing forward, the convex portion side surface 181F2 is an example of a side surface in the convex portion, and the side surface 181F3 on both sides is an example of another side surface.

Further, a plurality of first lugs 181 and second lugs 182 of the crawler 10A are alternately arranged on the outer peripheral surface 12B on the side of one end 12C and the side of the other end 12D with reference to the center line CL, respectively, in the circumferential direction R. Further, in the width direction W, the first tip portion 181B and the second tip portion 182B are arranged at positions facing each other, and the facing first tip portion 181B and the second tip portion 182B are arranged at intervals. As a result, the groove GR is formed, and the groove GR is arranged in front of the convex portion 181T.
Specifically, the first tip portion 181B of the first lug 181 and the second tip portion 182B of the second lug 182 are arranged at positions corresponding to the front of the convex portion 181T of the first lug 181. A groove GR is formed by being sandwiched between the two.
In other words, as shown in FIGS. 5 and 6, the groove portion GR is arranged in the width direction W of the crawler 10A by arranging the first tip portion 181B and the second tip portion 182B apart from each other. Corresponds to the position of the convex portion 181T of the first lug 181 adjacent to the circumferential direction R behind the normal rotation direction F in the groove portion GR.
As a result, the traction performance of the crawler 10A is improved by drawing in and compressing the earth and sand in front of the convex portion 181T toward the convex portion 181T as compared with the structure in which the lug is formed in front of the convex portion. It has become.

Further, in the crawler 10A, in the forward rotation direction F of the first lug 181, a curved recess 181U facing the rear is formed behind the convex portion 181T when viewed from the outer peripheral side of the crawler main body 12.
Here, the curved recess 181U is an example of the recess.

The curved recess 181U is a portion of the second lug 182 adjacent to the circumferential direction R that faces the second tip portion 181B formed so as to approach the rear surface of the first lug 181.
In other words, the second inclined portion of the second lug 182 arranged behind in the forward rotation direction F is arranged to face the position facing the curved recess 181U.
As a result, compared to the structure in which the rear part of the first lug is linear, a large amount of earth and sand enters between the rear part of the first lug 181 and the second tip portion 182B of the second lug 182, thereby improving the traction performance. It is designed to do.

Further, in the crawler 10A, the first tip portion 181B and the second tip portion 182B each have a first inclined portion 181V and a second inclined portion 182V following the groove portion GR in front of the crawler 10A.

Specifically, the first inclined portion 181V and the second inclined portion 182V are formed so as to expand toward the front in the forward rotation direction F, and the first inclined portion 181V and the second inclined portion 182V are formed in the forward rotation direction. The rear side of F is continuous with the groove GR.
In other words, the first inclined portion 181V and the second inclined portion 182V are formed so as to gradually approach each other from the front to the rear in the forward rotation direction F and continue to the groove portion GR.
When viewed from the side of the groove GR, the front side of the groove GR in the forward rotation direction F has a width wider than the width of the groove GR in the width direction W.
As a result, the traction performance is improved by collecting the earth and sand in front of the groove GR, as compared with the structure in which the front of the first tip and the front of the second tip are formed parallel to the center line of the crawler. ing.

Further, the convex portion 181T of the crawler 10A is arranged at a position corresponding to the wheel rolling surface 16 of the crawler main body 12 of the drive wheel 100 and the idle wheel 102.
Here, the drive wheel 100 and the idle wheel 102 are examples of wheels, and the wheel rolling surface 16 is an example of a passing surface.
As a result, the traction performance of the crawler 10A is improved as compared with the structure in which the convex portion is arranged at a position other than the passing surface of the wheel on the crawler body.

FIG. 8 shows two regions of the crawler main body 12 having a width W1 indicated by a alternate long and short dash line in the direction along the forward rotation direction F. These two regions are portions where the pair of wheel portions 100A and the pair of wheel portions 102A come into contact with the wheel rolling surface 16 of the crawler body 12 and roll on the wheel rolling surface 16.
Here, the wheel rolling surface 16 is an example of a passing surface.
In the present embodiment, the convex portion 181T is arranged at a position corresponding to the wheel rolling surface 16.

Further, in the crawler 10A, at least one of the first inclined portion 181V and the second inclined portion 182V is arranged at a position corresponding to the wheel rolling surface 16 of the drive wheel 100 and the idle wheel 102 in the crawler main body 12.

As shown in FIG. 8, in the present embodiment, as an example, the first inclined portion 181V is arranged at a position slightly overlapping the wheel rolling surface 16, and the second inclined portion 182V corresponds to the wheel rolling surface 16. Is arranged.
As a result, the earth and sand in front of the groove GR is strongly compressed as compared with the structure in which both the first inclined portion and the second inclined portion are arranged at positions other than the passing surface of the wheel in the crawler body, and the crawler 10A The traction performance of the car is improved.
Further, in this arrangement, the first inclined portion 181V may be arranged at a position slightly deviated from the wheel rolling surface 16, and both the first inclined portion 181V and the second inclined portion 182V are arranged on the wheel rolling surface 16. It may be arranged in the area of.
This arrangement setting is determined in consideration of the specifications including the dimensions and load of the crawler 10 and the properties of the soil surface G of the place where the crawler 10 is used, and the traction performance corresponding to the customer's needs is determined by the determination. Contributes to the improvement of.

Further, a shallow groove portion 181D is formed on the top surface 181C on the side of the first lug 181 near the base portion 181A. The shallow groove portion 181D is a groove opened to the front side surface 181F1 and the rear side surface 181R1 along the circumferential direction R when viewed from the side of the outer peripheral surface 12B of the crawler 10A. Further, the shallow groove portion 181D is curved and widened toward the front and the rear in the circumferential direction R.

<Operation of the second embodiment>
Here, the operation in the second embodiment will be described mainly with reference to FIGS. 3 and 7.

As shown in FIG. 7, the convex portion 181T projects toward the front in the forward rotation direction F of the crawler 10A, and a groove portion GR is formed in front of the convex portion 181T.
When the crawler 10A rotates in the forward rotation direction F and the first lug 181 and the second lug 182 come into contact with the soil surface G, the first lug 181 formed in front of the tip portion 181B of the first lug 181 in the forward rotation direction F. The earth and sand G1 on the soil surface G is attracted to the groove GR formed between the 1 inclined portion 181V and the second inclined portion 182V formed in front of the tip portion 182B of the second lug 182 in the forward rotation direction F. Enter into.
The earth and sand G1 that has entered the groove GR is compressed by the first inclined portion 181V, the second inclined portion 182V, the outer peripheral surface 12B of the crawler main body 12, and the soil surface G.
Subsequently, the convex portion 181T of the first lug 181 adjacent to the rear in the forward rotation direction F comes into contact with the soil surface G, and the convex portion 181T bites into the soil surface G (see also FIG. 3). The action of the convex portion 181T of the first lug 181 is the same as the action of the convex portion 18T of the lug 18 in the first embodiment.

Then, the rear side surface 181R1 at the tip portion 181B of the first lug 181 that first contacts the soil surface G in front of the forward rotation direction F, the rear side surface 182R1 and the groove portion GR at the tip portion 182B of the second lug 182, and the forward rotation direction. In the region S surrounded by the convex side surface 181F2 of the convex portion 181T of the first lug 181 adjacent to the rear of F, the side surface 181F3 formed on both sides in the width direction W, and the soil surface G, the earth and sand G1 is formed. The shearing force of the compressed earth and sand G1 is higher than the shearing force of the earth and sand G1 sandwiched between the first lug 181 and the second lug 182 around the region S.
As a result, in the region S, the force for biting the soil surface G in the forward rotation direction F of the crawler 10A increases, the driving force increases, and the traction performance of the crawler 10A improves.

Further, the front side surface 181F1 of the first lug 181 is inclined rearward with respect to the perpendicular line P on the outer peripheral surface 12B of the crawler main body 12, and the convex portion side surface 181F2 of the convex portion 181T is the convex portion side surface 181F2. The inclination angle θ is set larger than that of the side surfaces 181F3 located on both sides of the crawler body 12 in the width direction W.
In other words, the length of the convex side surface 181F2 in the protruding direction H is longer than the length of the side surface 181F3 on both sides in the protruding direction H.

As a result, the inclination angle of the convex portion side surface 181F2 in the convex portion 181T is the same as the inclination angle of both side surfaces 181F3 located on both sides of the crawler body 12 of the convex portion side surface 181F2 in the width direction W. The amount of bite into rough terrain increases.

Further, the first lug 181 and the second lug 182 are provided on the outer peripheral surface 12B, with reference to the center line CL, on the side of one end 12C and the side of the other end 12D, respectively, alternately in the circumferential direction R, and in width. In the direction W, the first tip portion 181B and the second tip portion 182B are arranged at positions facing each other, and the facing first tip portion 181B and the second tip portion 182B are arranged at intervals so that the groove portion is formed. A GR is formed, and the groove GR is arranged so as to correspond to the front of the convex portion 181T.

As a result, the crawler is compressed by pulling in the earth and sand G1 in front of the convex portion 181T toward the convex portion 181T, as compared with the structure in which another lug is formed in front of the convex portion 181T in the forward rotation direction F. Traction performance is improved.

Further, in the forward rotation direction F of the first lug 181, a curved recess 181U facing the rear is formed behind the convex portion 181T when viewed from the outer peripheral side of the crawler main body 12.

As a result, as compared with the structure in which the rear part of the first lug 181 is linear, a large amount of earth and sand G1 enters between the rear part of the first lug 181 and the second tip portion 182B of the second lug 182, so that the traction performance is improved. improves.

Further, the first tip portion 181B and the second tip portion 182B have a first inclined portion 181V and a second inclined portion 182V following the groove portion GR in front of the respective forward rotation directions F.

As a result, the traction performance is improved by collecting the earth and sand G1 in front of the groove GR, as compared with the structure in which the front of the first tip 181B and the second tip 182B is formed parallel to the center line CL of the crawler 10A. To do.

Further, the convex portion 181T is arranged at the position W1 corresponding to the wheel rolling surface 16 of the wheel on the crawler main body 12.

As a result, the traction performance of the crawler 10 is improved by deeply biting into the soil surface G as compared with the structure in which the convex portion 181T is arranged at a position other than the wheel rolling surface 16 of the wheel on the crawler body 12.

Further, at least one of the first inclined portion 181V and the second inclined portion 182V is arranged at the position W1 corresponding to the wheel rolling surface 16 of the wheel in the crawler main body 12.

As a result, both the first inclined portion 181V and the second inclined portion 182V are located in front of the groove portion GR as compared with the structure in which both the first inclined portion 181V and the second inclined portion 182V are arranged at positions other than the wheel rolling surface 16 (region W1) of the wheels in the crawler body 12. The traction performance of the crawler 10 is improved by attracting the earth and sand G1 in the crawler and strongly compressing the earth and sand G1.

The embodiments of the present disclosure have been described above with reference to the embodiments, but these embodiments are examples and can be modified in various ways without departing from the gist. It goes without saying that the scope of rights of the present disclosure is not limited to these embodiments.

For example, in the

crawler

10 or 10A, a sprocket (not shown) is used in combination with the drive wheel 100, and the teeth of the sprocket are formed on the inner peripheral surface of the crawler body 12 and mesh with a recess that does not reach the outer peripheral surface of the crawler to drive the crawler 10. Although it has been explained that the driving force of the wheel 100 is transmitted to the

crawler

10 or 10A, the driving wheel 100 is driven by the frictional force between the outer peripheral surface 100B of the driving wheel 100 and the wheel rolling surface 16 without using a sprocket. A friction drive system in which the force is transmitted to the

crawler

10 or 10A may be used.

Further, although it has been explained that the base portion 18A of the lug 18 or the base portion 181A of the first lug 181 is provided with the

shallow groove portion

18D or 181D, respectively, the

shallow groove portion

18D or 181D is not necessarily provided.

The disclosure of Japanese Patent Application No. 2019-73662 filed on April 8, 2019 is incorporated herein by reference in its entirety.
All documents, patent applications, and technical standards described herein are to the same extent as if the individual documents, patent applications, and technical standards were specifically and individually stated to be incorporated by reference. Incorporated herein by reference.

Claims

An endless crawler body formed of elastic material and wrapped around a wheel,
A plurality of convex portions projecting on the outer peripheral surface of the crawler body, extending in the width direction of the crawler body and at intervals in the circumferential direction of the crawler body, and projecting forward in the forward rotation direction of the crawler body. With the rug being formed,
Crawler with.
The crawler according to claim 1, wherein the convex portion is formed at a central portion of the lug in the width direction of the crawler body.
The lug has a base portion formed at one end in the width direction of the crawler body and a tip portion formed at the other end in the width direction of the crawler body when viewed from the outer peripheral side of the crawler body.
The crawler according to claim 1 or 2, wherein the lugs adjacent to each other in the circumferential direction are arranged in opposite directions in the width direction.
The front-facing side surface of the lug is entirely inclined rearward with respect to the perpendicular on the outer peripheral surface of the crawler body.
The crawler according to any one of claims 1 to 3, wherein the side surface of the convex portion has a larger inclination angle than the other side surfaces located on both sides of the crawler body in the width direction.
The crawler according to any one of claims 1 to 4, wherein a concave portion facing the rear is formed behind the convex portion when viewed from the outer peripheral side of the crawler main body in the forward rotation direction of the lug. ..
The lag is
When viewed from the outer peripheral side of the crawler body, a first base portion arranged at one end in the width direction of the crawler body and a first base portion extending from the first base portion across a central line passing through the center of the crawler body to become a tip. A first lug in which one tip portion and the convex portion arranged between the first base portion and the first tip portion are formed.
A second base portion arranged at the other end in the width direction of the crawler body, and a second tip extending from the second base portion to the other end side of the center line passing through the center of the crawler body. The second lug on which the part was formed,
With
A plurality of the first lug and the second lug are provided at intervals in the circumferential direction of the crawler body, and the first tip portion and the second tip portion are provided in the width direction of the crawler body. The crawler according to claim 1, which is arranged so as to face each other in the width direction.
The front-facing side surface of the first lug is entirely inclined rearward with respect to a perpendicular line on the outer peripheral surface of the crawler body.
The crawler according to claim 6, wherein the side surface of the convex portion is set to have a larger inclination angle than other side surfaces located on both sides of the crawler body in the width direction.
The first lug and the second lug are provided on the outer peripheral surface, with reference to the center line, on one end side and the other end side, respectively, alternately in the circumferential direction and in the width direction. The first tip portion and the second tip portion are arranged at positions facing each other.
A groove is formed by arranging the facing first tip and the second tip at intervals.
The crawler according to claim 6 or 7, wherein the groove is arranged corresponding to the front of the convex portion.
The invention according to any one of claims 6 to 8, wherein a concave portion facing the rear is formed behind the convex portion when viewed from the outer peripheral side of the crawler main body in the forward rotation direction of the first lug. Crawler.
The crawler according to claim 8, wherein the first tip portion and the second tip portion have a first inclined portion and a second inclined portion following the groove portion in the front thereof, respectively.
The crawler according to any one of claims 6 to 10, wherein the convex portion is arranged at a position corresponding to a passing surface of the wheel in the crawler main body.
The crawler according to claim 10, wherein at least one of the first inclined portion and the second inclined portion is arranged at a position corresponding to a passing surface of the wheel in the crawler main body.