JP6255539B1 - Crawler belt - Google Patents

Abstract

The crawler belt (B) is configured such that the outer peripheral surface (22) is a ground contact surface and the inner peripheral surface (21) is a belt support member sliding contact surface. Each of the side surfaces (24) on both sides is a rising surface portion (24a) formed so as to rise in the thickness direction provided via the inner peripheral side corner (23) continuously to the inner peripheral surface (21). And an inclined surface portion (24b) formed so as to be inclined inwardly toward the outer peripheral side provided on the outer peripheral side of the rising surface portion (24a).

Description

  The present invention relates to a crawler belt, a belt unit using the crawler belt, and a conveying device.

  In the event of a disaster such as an earthquake or a fire, it is necessary to evacuate people who have difficulty walking on the upper floors from the stairs to the lower floors safely and quickly. Patent Document 1 discloses a hand-held stair evacuation seat descent device used in such a case. This stair evacuation seat-type descent device is provided with a pair of front and rear wheels for moving a flat surface and a pair of crawler belts for descent on the stairs on the device body to which a seat for accommodating refugees is attached. The wheel is grounded when moving on a flat surface, and the crawler belt is grounded by accommodating the rear wheel when going down the stairs.

JP 2007-210525 A

The present invention is a crawler belt in which the outer peripheral surface is a ground contact surface and the inner peripheral surface is a belt support member slidable contact surface, and includes a rubber belt body, and each of the side surfaces on both sides is the inner peripheral surface. A rising surface portion formed so as to rise in the belt thickness direction provided through the inner peripheral side corner portion, and inwardly toward the outer peripheral side provided on the outer peripheral side of the rising surface portion. and a formed inclined surface portion so as to be inclined, viewed including the rising surface portion is formed of a rubber composition portion, each side of the two side, and the inclined surface portion and the rising surface portion Further, an inwardly sectioned outer shape provided so as to connect the two has an immersive surface portion formed in an arc shape .
The present invention is a crawler belt in which the outer peripheral surface is a ground contact surface and the inner peripheral surface is a belt support member sliding contact surface, and each of the side surfaces on both sides is connected to the inner peripheral surface. A rising surface portion formed so as to rise in the belt thickness direction provided through the portion, and an inclination formed so as to be inclined inward toward the outer peripheral side provided on the outer peripheral side of the rising surface portion. A surface portion, and an immersive surface portion formed in an arc shape with an inwardly immersing cross-sectional shape provided to connect the rising surface portion and the inclined surface portion.

  The present invention comprises the crawler belt of the present invention, an elongated belt support member, and a pair of flat pulleys having flanges on both sides pivotally supported at both ends of the belt support member, The belt support member is wound around the pair of flat pulleys so that the inner peripheral surfaces are in contact with each other, and the belt support member is a surface with which the inner peripheral surface on the back side corresponding to the outer peripheral surface that is grounded is in sliding contact with the crawler belt during belt running It is a belt unit which has.

  The present invention is a transport device provided with the belt unit of the present invention.

It is a perspective view of a crawler belt concerning an embodiment. It is sectional drawing of the crawler belt which concerns on embodiment. It is sectional drawing of the immersion surface part of the side surface of the crawler belt which concerns on embodiment. It is sectional drawing of the outer peripheral side corner | angular part of the side surface of the crawler belt which concerns on embodiment. It is a figure which shows the measuring method of an apparent friction coefficient. It is a perspective view of the sitting type descent device for stairs evacuation. It is a front view of a belt unit. It is VB-VB sectional drawing in FIG. 5A. It is VC-VC sectional drawing in FIG. 5A. It is a figure which shows the descent of the stairs by the stair type evacuation apparatus for stair evacuation. It is a figure which shows the pulley layout of the belt running test machine for an abrasion resistance evaluation test. It is a graph which shows the relationship between a rising surface part ratio and a wear index. It is the 1st explanatory view showing a measuring method of belt bending rigidity. It is the 2nd explanatory view showing a measuring method of belt bending rigidity. It is the 3rd explanatory view showing a measuring method of belt bending rigidity. It is a graph which shows the relationship between a rising surface part ratio and a belt bending rigidity index.

  Hereinafter, embodiments will be described in detail based on the drawings.

  1 and 2A to 2C show a crawler belt B according to the embodiment.

  The crawler belt B according to the embodiment is an endless belt and includes a rubber belt body 10 having a two-layer structure including an adhesive rubber layer 11 on the inner peripheral side and a ground rubber layer 12 on the outer peripheral side. A core wire 13 is embedded in an intermediate portion of the adhesive rubber layer 11 in the belt main body 10 in the belt thickness direction so as to form a spiral having a pitch in the belt width direction. A reinforcing cloth 14 is attached to the belt inner peripheral side of the adhesive rubber layer 11 in the belt main body 10.

  The adhesive rubber layer 11 and the ground rubber layer 12 are formed of a rubber composition in which an uncrosslinked rubber composition in which various rubber compounding agents are blended with a rubber component and kneaded is heated and pressurized to be crosslinked with the crosslinking agent. Yes. The adhesive rubber layer 11 and the ground rubber layer 12 may be formed of a rubber composition having a different composition or may be formed of a rubber composition having the same composition.

  Examples of the rubber component of the rubber composition forming the adhesive rubber layer 11 and the ground rubber layer 12 include ethylene such as chloroprene rubber (CR), ethylene / propylene copolymer (EPR), and ethylene / propylene / diene terpolymer (EPDM). -Α-olefin elastomer, chlorosulfonated polyethylene rubber (CSM) and the like. As the rubber component, it is preferable to use one or more of these blend rubbers. The rubber components of the rubber composition forming the adhesive rubber layer 11 and the ground rubber layer 12 are preferably the same.

  Examples of rubber compounding agents include reinforcing materials such as carbon black, fillers, anti-aging agents, softeners, cross-linking agents, and vulcanization accelerators. It is preferable that short fibers are blended in the rubber composition forming the ground rubber layer 12. In that case, it is preferable that the short fibers are exposed or protruded from the surface of the ground rubber layer 12.

  The core wire 13 is composed of a twisted yarn formed of polyester fiber, aramid fiber, polyamide fiber or the like. The diameter of the core wire 13 is, for example, not less than 0.5 mm and not more than 1.0 mm. The dimension between the centers of the adjacent core wires 13 in the cross section is, for example, 0.05 mm or more and 0.20 mm or less. The core wire 13 is subjected to an adhesion treatment for adhesion to the belt body 10.

  The reinforcing cloth 14 is made of, for example, a woven cloth formed of cotton, polyamide fiber, polyester fiber, aramid fiber, or the like. The thickness of the reinforcing cloth 14 is, for example, not less than 0.5 mm and not more than 1.0 mm. The reinforcing cloth 14 is subjected to an adhesion treatment for adhesion to the belt body 10.

  The crawler belt B according to the embodiment has, for example, a belt length L of 500 mm to 700 mm, a belt width W of 10 mm to 20 mm, and a belt thickness T of 4 mm to 10 mm. The ratio of the belt width W to the belt thickness T is preferably 1.5 or more and 3.0 or less, more preferably 2.0 or more and 2.5 or less from the viewpoint of obtaining stable belt running performance.

  In the crawler belt B according to the embodiment, the narrow outer peripheral surface 22 is configured as a flat ground surface by the ground rubber layer 12, and the wide inner peripheral surface 21 is formed as a flat belt support member sliding surface by the reinforcing cloth 14. It is configured. The width w of the outer peripheral surface 22 is, for example, 7 mm or more and 11 mm. The width of the inner peripheral surface 21, that is, the ratio of the belt width W to the width w of the outer peripheral surface 22 is preferably larger than 1.0 and not larger than 2.0, more preferably not smaller than 1.4 and not larger than 1.6.

The rubber hardness measured using a type A durometer based on JIS K6253 of the grounding rubber layer 12 to be the outer peripheral surface 22 constituting the grounding surface is preferably 77H _A or more and 87H _A or less, more preferably 80H _A or more and 84H. _A or less. The rubber hardness of the ground rubber layer 12 can be controlled by blending the rubber composition that forms the ground rubber layer 12.

  The apparent friction coefficient of the surface of the grounding rubber layer 12, that is, the outer peripheral surface 22 constituting the grounding surface is preferably 0.6 or more and 1.3 or less, more preferably 0.8 or more and 1.1 or less. The apparent friction coefficient of the surface of the reinforcing cloth 14, that is, the inner peripheral surface 21 constituting the belt support member sliding contact surface, is preferably 0.4 or more and 1.0 or less, more preferably 0.6 or more and 0.8 or less. It is. The apparent friction coefficient of the outer peripheral surface 22 is preferably higher than the apparent friction coefficient of the inner peripheral surface 21. The apparent friction coefficient of the outer peripheral surface 22 can be controlled by blending the rubber composition that forms the ground rubber layer 12. The apparent friction coefficient of the inner peripheral surface 21 can be controlled by the adhesion treatment material of the reinforcing cloth 14 or the like.

  As shown in FIG. 3, the apparent friction coefficient μ ′ is obtained by winding the belt piece 31 around a flat pulley 32 having an outer diameter of 60 mm so that the surface of the grounding rubber layer 12 or the surface of the reinforcing cloth 14 contacts. Wrapped at an angle θ = 90 °, the upper end of the belt piece 31 is chucked and connected to the load cell 33, and the lower end hanging vertically is chucked and the weight 34 (17.15N) The flat pulley 32 is rotated at 42 rpm so as to increase the tension of the portion from the load cell 33 to the flat pulley 32 of the belt piece 31 (counterclockwise in FIG. 3), and the loose side by the weight 34 at that time From the tension Ts and the tension side tension Tt detected by the load cell 33, the following equation (1) is obtained based on the Euler equation. The method for measuring the apparent friction coefficient μ 'is described on page 122 of "Practical design of belt transmission, belt transmission technology symposium published by Yokendo Co., Ltd.".

  Each of the side surfaces 24 on both sides includes a rising surface portion 24a provided continuously through the inner peripheral surface 21 via an inner peripheral side corner 23, and an inclined surface portion 24b provided on the outer peripheral side of the rising surface portion 24a. The rising surface portion 24a and the inclined surface portion 24b are provided with an immersion surface portion 24c provided to connect the rising surface portion 24a and the inclined surface portion 24b. Between each inclined surface part 24b and the outer peripheral surface 22 of the side surface 24 of both sides, the outer peripheral side corner | angular part 25 provided so that they might be connected is comprised.

  The rising surface portion 24 a is formed so as to rise in the belt thickness direction provided via the inner peripheral side corner 23 continuously to the inner peripheral surface 21. The angle formed by the rising surface portion 24a and the inner peripheral surface 21 is preferably 90 °. When the belt is wound around the flat pulley, the rising surface portion 24a comes into surface contact with the flange of the flat pulley to disperse the pressure, whereby high wear resistance of the side surface 24 can be obtained. The rising surface portion 24 a may be configured by a part or all of the reinforcing cloth 14 and the adhesive rubber layer 11, and is configured by a part of the reinforcing cloth 14, the adhesive rubber layer 11, and the ground rubber layer 12. May be. The dimension t in the belt thickness direction of the rising surface portion 24a is preferably 5% or more, more preferably 10% or more, and still more preferably 20% or more of the belt thickness T from the viewpoint of enhancing the wear resistance of the side surface 24. From the viewpoint of keeping the belt bending rigidity low, it is preferably not more than half (50%) of the belt thickness T, more preferably not more than 40%, still more preferably not more than 30%.

  The inclined surface portion 24b is formed so as to be inclined inwardly toward the outer peripheral side. The inclined surface portion 24b may be configured by a part of the adhesive rubber layer 11 and the grounding rubber layer 12, or may be configured by a part or all of the grounding rubber layer 12. The angle formed by the inclined surface portions 24b on both sides in the cross section is preferably 30 ° or more and 45 ° or less, more preferably 35 ° or more and 45 ° or less, and still more preferably 40 °, from the viewpoint of improving flexibility.

  The immersive surface portion 24c has a cross-sectional outline that is immersed inward in an arc shape. By providing the immersion surface portion 24c, the rising surface portion 24a can be made larger compared to the case where the rising surface portion 24a and the inclined surface portion 24b are made continuous, so that the wear resistance of the side surface 24 can be further improved. it can. The radius of curvature r in the cross section of the immersion surface portion 24c is preferably 0.05 mm or more and 0.5 mm or less, more preferably 0.1 mm or more and 0.3 mm or less from the viewpoint of improving the wear resistance of the side surface 24.

  The outer peripheral side corner portion 25 is formed in an arc shape with a cross-sectional outer shape bulging outward. The radius of curvature R in the cross section of the outer peripheral side corner 25 is preferably 5 mm or more and 20 mm from the viewpoint of dispersing the shear stress acting on the outer peripheral side corner 25 to suppress the generation of cracks and obtaining the contact area of the outer peripheral surface 22. Hereinafter, it is more preferably 8 mm or more and 12 mm or less. The ratio of the radius of curvature R in the cross section of the outer peripheral corner 25 to the radius of curvature r in the cross section of the immersion surface portion 24c is preferably 20 or greater and 80 or less, and more preferably 40 or greater and 60 or less.

  The crawler belt B according to the embodiment having the above-described configuration can be manufactured by a known belt manufacturing method.

  By the way, the crawler belt used for the stair evacuation seat lowering apparatus disclosed in Patent Document 1 has a so-called V-belt shape with a trapezoidal cross section, and a narrow outer peripheral surface is configured as a ground contact surface. In addition, a wide inner peripheral surface is configured as a belt support member sliding contact surface that is in sliding contact with a frame that is a support member that supports the crawler belt, and is wound around a pair of pulleys provided on the frame. However, this crawler belt has a problem that the wear resistance of the side surface contacting the pulley flange is low.

  However, according to the crawler belt B according to this embodiment, each of the side surfaces 24 on both sides is continuously provided on the inner peripheral surface 21 via the inner peripheral side corner portion 23, and the outer periphery thereof. Since the inclined surface portion 24b is provided on the side, the rising surface portion 24a comes into surface contact with the flange of the flat pulley described later while maintaining the flexibility by the inclined surface portion 24b, and the pressure is dispersed. Abrasion can be obtained. In addition, since the belt running performance is stabilized by the rising surface portions 24a of the side surfaces 24 on both sides, rollover during the belt running can be suppressed.

  FIG. 4 shows a stair evacuation seat-type descent device 40 (conveyance device) using the crawler belt B according to the embodiment.

  The seat-type descent device 40 for stair evacuation is provided with a seat 42 for accommodating a refugee on a device main body 41 formed of a metal pipe, and a pair of large-diameter front wheels 43 are provided on the front side of the lower part. A pair of small-diameter rear wheels 44 are provided on the lower rear side. The member to which the rear wheel 44 is attached is configured to be movable between a position where the rear wheel 44 is exposed and a position where the rear wheel 44 is stored. A belt unit 50 is provided on each of both sides of the instrument body 41 so as to extend rearward and obliquely upward from the attachment position of the front wheel 43, and the belt unit 50 includes the crawler belt B according to the embodiment.

  5A to 5C show the belt unit 50.

  The belt unit 50 includes an elongated frame 51 constituting a belt support member. The frame 51 is a metal member formed by pressing a metal plate such as aluminum so that the cross-sectional shape is formed into a vertically long rectangle. The frame 51 includes a front surface portion 52, an upper surface portion 53, a back surface portion 54, and a bottom surface portion 55. Is provided with a slit-like opening 56 formed so as to extend in the length direction. On the outer surface of the bottom surface portion 55 of the frame 51, a U-shaped concave groove 57 formed so as to extend in the length direction is provided. A pair of flat pulleys 58 having flanges 58 a on both sides are pivotally supported at both ends of the frame 51 so as to be sandwiched between the front surface portion 52 and the back surface portion 54.

  The crawler belt B according to the embodiment is wound so that the inner peripheral surface 21 is in contact with a pair of flat pulleys 58 at both ends of the frame 51. In the crawler belt B according to the embodiment, the portion on the bottom surface 55 side that extends between the pair of flat pulleys 58 is accommodated in the concave groove 57 of the bottom surface 55 and the inner peripheral surface 21 that is a belt contact member sliding surface is the groove bottom surface. The inner peripheral surface 21 on the back side corresponding to the grounded outer peripheral surface 22 is slidably contacted with the groove bottom surface 57a of the concave groove 57 when the crawler belt B according to the embodiment travels in the longitudinal direction. Is provided. The portion on the upper surface portion 53 side that extends between the pair of flat pulleys 58 in the crawler belt B according to the embodiment is provided so as to extend inside the upper surface portion 53 along the length direction.

  This seat-type descent device 40 for stair evacuation is used for transporting persons with difficulty walking, especially for evacuation during disasters such as earthquakes and fires, and for persons with difficulty walking with the front wheels 43 and the rear wheels 44 grounded. It is configured such that the assistant sits on the seat 42 and operates the steering wheel 45 with the handle 45 provided on the instrument body 41. And when moving on a flat surface, if the assistant operates the handle 45 in a state where the front wheels 43 and the rear wheels 44 are grounded, the front wheel 43 and the rear wheels 44 may move back and forth and right and left. it can. Further, when going down the stairs, as shown in FIG. 6, the rear wheel 44 is accommodated, and the belt unit 50 on both sides is stepped on the outer peripheral surface 22 of the crawler belt B extending in the concave groove 57 of the bottom surface portion 55 of the frame 51. When the assistant P1 pushes the handle 45 forward in this state, the crawler belt B rotates between the pair of flat pulleys 58 and the inner peripheral surface 21 thereof. Is in sliding contact with the groove bottom surface 57a of the concave groove 57 of the bottom surface portion 55 of the frame 51, and the instrument body 41 on which the walking difficult person P2 is placed can move obliquely downward along the stairs S. At this time, in the crawler belt B according to the embodiment, each of the side surfaces 24 on both sides is continuous with the inner peripheral surface 21 and is provided on the outer peripheral side with the rising surface portion 24a provided via the inner peripheral side corner portion 23. Since the inclined surface portion 24b is provided, the rising surface portion 24a is brought into surface contact with the flange 58a of the flat pulley 58 and the pressure is dispersed while maintaining the flexibility by the inclined surface portion 24b. Can be obtained. Further, since the side surface 24 has the rising surface portion 24 a, even if the belt running position is swung in the width direction, the rising surface portion 24 a is the groove inner wall of the groove 57 of the bottom surface portion 55 of the frame 51 and the flange of the flat pulley 58. Since the belt 58 is in surface contact with the belt, the belt running performance is stabilized, and thereby the rollover during the belt running can be suppressed.

  The crawler belt B according to the embodiment is not limited to the stair evacuation seat-type descent device 40 and can be used for various purposes.

  A crawler belt similar to the above embodiment in which the ratio of the dimension of the rising surface portion in the belt thickness direction to the belt thickness was varied, and a conventional V-belt type crawler belt having a configuration similar thereto were prepared. An abrasion evaluation test and a belt bending rigidity test were performed.

(Abrasion resistance evaluation test)
FIG. 7 shows a belt running test machine for an abrasion resistance evaluation test.

  In the belt running test machine 60, a driving pulley 61 and a driven pulley 62 each constituted by a flat pulley having a flange having a pulley diameter of 20 mm are arranged on the left and right, and the driven pulley 62 is configured to be movable left and right. Yes.

  For each crawler belt B, the drive pulley 61 and the driven pulley 62 of the belt running test machine 60 are wound around, a shaft load of 98 N is applied to the driven pulley 62 laterally, and the drive pulley 61 is rotated at a rotation speed of 1000 rpm for 15 minutes. The belt was run. Then, the wear index was determined with the difference in mass before and after running the belt as the wear amount, and the wear amount of the conventional V-belt type crawler belt as 100.

  FIG. 8 shows the relationship between the percentage of the dimension of the rising surface portion in the belt thickness direction with respect to the belt thickness (hereinafter referred to as “rising surface portion ratio”) and the wear index. The conventional V-belt type crawler belt has a rising surface portion ratio of 0% and a wear index of 100%.

  According to FIG. 8, it can be seen that the wear index is about 30% when the ratio of the rising surface portion is only about 5%, and that very high wear resistance can be obtained by providing the rising surface portion. It can also be seen that a slight improvement in wear resistance is observed when the rising surface portion ratio is 5% or more and 10% or less, but no further improvement in wear resistance is observed when the rising surface portion ratio is 10% or more.

(Belt bending stiffness test)
For each crawler belt B, as shown in FIG. 9, the core wire of the portion in contact with the upper plate 71 when a load P is applied to the upper plate 71 from above by being sandwiched between the upper plate 71 and the lower plate 72 Measure the dimension b between the position and the core line position of the part in contact with the lower plate 72, calculate the belt bending rigidity EI based on EI = 0.174 × P × b ² , The belt bending stiffness index was determined by setting the belt bending stiffness EI of the crawler belt of the mold to 100.

  The dimension b can be obtained as follows. First, for each crawler belt B, the belt outer peripheral length L1 in a natural state is measured, and then the crawler belt B is inverted and the belt inner peripheral length L2 is measured. As shown in FIGS. 9B and 9C, the crawler belt B is inverted around the center line position, so the dimension H from each of the upper plate 71 and the lower plate 72 to the center line position is H = (L1-L2). Calculated as / 4π. The dimension b is obtained as b = b′−2H from the dimension b ′ between the upper plate 71 and the lower plate 72.

  FIG. 10 shows the relationship between the rising surface portion ratio and the belt bending stiffness index. In the conventional V-belt type crawler belt, the ratio of the rising surface portion is 0%.

  According to FIG. 10, the belt bending stiffness index gradually increases until the rising surface portion ratio is about 40%. However, when the rising surface portion ratio exceeds 40%, the increase rate of the belt bending stiffness index increases. I understand.

  INDUSTRIAL APPLICATION This invention is useful about the technical field of a crawler belt, a belt unit using the same, and a conveyance apparatus.

B crawler belt 21 inner peripheral surface 22 outer peripheral surface 23 inner peripheral corner portion 24 side surface 24a rising surface portion 24b inclined surface portion 24c immersion surface portion 25 outer peripheral side corner portion 40 stair evacuation seat type descent device (conveyance device)
50 belt unit 51 frame (belt support member)
57a Groove bottom 58 Flat pulley 58a Flange

Claims (15)

A crawler belt in which the outer peripheral surface is a ground contact surface and the inner peripheral surface is a belt support member sliding contact surface,
With a rubber belt body,
Each of the side surfaces on both sides is formed on the outer peripheral side of the rising surface portion and the rising surface portion formed so as to rise in the belt thickness direction provided through the inner peripheral side corner portion. An inclined surface portion formed so as to be inclined inwardly toward the outer peripheral side provided,
Look including the portion where the rising surface section is formed of a rubber composition,
Each of the side surfaces on both sides is a crawler belt further having an immersive surface portion in which an inwardly immersing cross-sectional outline is formed in an arc shape so as to connect the rising surface portion and the inclined surface portion . The crawler belt according to claim 1 ,
A crawler belt having a radius of curvature of 0.05 mm to 0.5 mm in a cross section of the immersion surface portion. The crawler belt according to claim 1 or 2,
A crawler having outer peripheral side corners formed in an arc shape with an outwardly bulging cross-sectional outline provided so as to connect the inclined surface portions and the outer peripheral surfaces of the side surfaces on both sides. belt. The crawler belt according to claim 3 ,
The crawler belt whose ratio with respect to the curvature radius in the cross section of the said immersion surface part of the curvature radius in the cross section of the said outer peripheral side corner part is 20-80. The crawler belt according to claim 3 or 4 ,
The crawler belt whose curvature radius in the cross section of the said outer peripheral side corner | angular part is 5 mm or more and 20 mm or less. In the crawler belt according to any one of claims 1 to 5 ,
A crawler belt in which a dimension in a belt thickness direction of the rising surface portion is equal to or less than half of the belt thickness. In the crawler belt according to any one of claims 1 to 6 ,
A crawler belt having a friction coefficient of the outer peripheral surface higher than that of the inner peripheral surface. In the crawler belt according to any one of claims 1 to 7 ,
A crawler belt having a ratio of a belt width to a belt thickness of 1.5 to 3.0. The crawler belt according to any one of claims 1 to 8 ,
A crawler belt in which a ratio of a width of the inner peripheral surface to a width of the outer peripheral surface is greater than 1.0 and 2.0 or less. The crawler belt according to any one of claims 1 to 9 ,
The crawler belt wherein a dimension of the rising surface portion in the belt thickness direction is 5% or more and 50% or less of the belt thickness. A crawler belt in which the outer peripheral surface is a ground contact surface and the inner peripheral surface is a belt support member sliding contact surface,
Each of the side surfaces on both sides is formed on the outer peripheral side of the rising surface portion and the rising surface portion formed so as to rise in the belt thickness direction provided through the inner peripheral side corner portion. An inclined surface portion formed so as to incline inward as it goes toward the outer peripheral side provided, and an inwardly immersed cross-sectional outline provided so as to connect the rising surface portion and the inclined surface portion. A crawler belt having an immersive surface portion formed in an arc shape. The crawler belt according to claim 11 ,
A crawler belt having a radius of curvature of 0.05 mm to 0.5 mm in a cross section of the immersion surface portion. The crawler belt according to claim 11 or 12 ,
An outer peripheral side corner portion in which an outwardly bulging cross-sectional outer shape formed so as to connect the inclined surface portion and the outer peripheral surface of each of the side surfaces on both sides is formed in an arc shape is configured,
The crawler belt whose ratio with respect to the curvature radius in the cross section of the said immersion surface part of the curvature radius in the cross section of the said outer peripheral side corner part is 20-80. A crawler belt according to any one of claims 1 to 13 ,
An elongated belt support member;
A pair of flat pulleys having flanges on both sides pivotally supported by both ends of the belt support member;
With
The crawler belt is wound around the pair of flat pulleys so that the inner peripheral surface is in contact with the crawler belt,
The belt support member has a surface on which the inner peripheral surface on the back side corresponding to the outer peripheral surface that is grounded is in sliding contact with the crawler belt when the belt travels. A transport device provided with the belt unit according to claim 14 .

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