Method for manufacturing traveling drum and traveling drum

Abstract

To provide a method for manufacturing a traveling drum capable of attaching / detaching two or more kinds of division pieces having different lengths in a drum circumferential direction without restriction, and to provide the traveling drum.SOLUTION: A traveling drum includes a plate constituted so as to be freely attachable to / detachable from a drum main body and formed of two or more division pieces 22 divided in a drum circumferential direction CD. The two or more division pieces 22 include two or more kinds of division pieces (22a) having different lengths in the drum circumferential direction CD. Fastening parts 23 are formed at a uniform separation distance L around the periphery of the drum with respect to the drum main body. The two or more fastening parts 23 are formed at the uniform separation distance L on one side in a drum axial direction AD with respect to the two or more kinds of division pieces 22, respectively. In each of the two or more kinds of division pieces 22, a distance in the drum circumferential direction CD from a first end S1 in the drum circumferential direction CD to the nearest fastening part 23 is α, and a distance in the drum circumferential direction CD from a second end S2 on the side opposite to the first end S1 in the drum circumferential direction CD to the nearest fastening part 23 is L-α.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a manufacturing method of a running drum used in tire performance testing, and a running drum. [Background technology]

[0002] Conventionally, indoor drum tests have been carried out using an indoor drum testing machine equipped with a running drum to evaluate various tire performances. As in Patent Document 1, it is disclosed that the running drum is composed of a drum body and a plate that is detachable from the drum body, and a simulated road surface is formed on the plate. The running drum is rotated while the tire is pressed against it, so that the tire can be made to run on the simulated road surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-218470 Summary of the Invention [Problem to be solved by the invention]

[0004] In indoor drum test machines, simulated road surfaces of various roughnesses are used depending on the driving conditions, etc. As in Patent Document 1, by making the plate with the simulated road surface detachable from the drum, it becomes possible to carry out driving tests on multiple types of simulated road surfaces by simply attaching and detaching the plate.

[0005] The plate is composed of a plurality of segments separated in the circumferential direction of the drum. In order to reduce the adverse effect of noise generated when the tire passes over the joints of the segments, the plurality of segments includes a plurality of types of segments having different lengths in the circumferential direction of the drum.

[0006] The bolt holes in the segments are generally arranged so as to divide the segments equally. In this case, the distance between the bolt holes in the first type segments is different from the distance between the bolt holes in the second type segments, which have a different length in the circumferential direction of the drum from the first type segments. In other words, the arrangement of the bolt holes varies between the multiple types of segments, which have different lengths in the circumferential direction of the drum. Therefore, when bolt holes corresponding to multiple types of segments are formed in the drum body, the number of bolt holes in the drum body increases. As a result, a new bolt hole to be formed may overlap an existing bolt hole, making it impossible to form a new bolt hole, or the mass balance may be deteriorated due to the circumferential deviation of the bolt holes in the drum body. In addition, there may be a restriction on the types of segments that can be attached to one drum body.

[0007] The present disclosure provides a manufacturing method for a traveling drum that enables a plurality of types of divided pieces with different circumferential lengths of the drum to be attached and detached without restriction, and a traveling drum. [Means for solving the problem]

[0008] A manufacturing method for a traveling drum disclosed herein, the traveling drum comprises a drum body, a plate configured to be freely attached and detached to the drum body, and a pseudo road surface formed on the plate, the plate being composed of a plurality of segments divided in the drum circumferential direction, the plurality of segments including a plurality of types of segments having different lengths in the drum circumferential direction, the method including: forming fastening portions for attaching the segments on the drum body at a uniform separation distance L around the drum; and forming, for each of the plurality of types of segments, two or more fastening portions for attaching the segments on one side in the drum axial direction, separated by the uniform separation distance L, wherein, for each of the plurality of types of segments, a circumferential distance from a first end in the drum circumferential direction to the nearest fastening portion is α, and a circumferential distance from a second end opposite the first end in the drum circumferential direction to the nearest fastening portion is L-α.

[0009] The traveling drum of the present disclosure comprises a drum body, a plate configured to be freely attached and detached to the drum body, and a pseudo road surface formed on the plate, the plate being composed of a plurality of segments divided in the drum circumferential direction, the plurality of segments including a plurality of types of segments having different lengths in the drum circumferential direction, the drum body having fastening portions for attaching the segments formed at a uniform separation distance L around the drum, each of the plurality of types of segments having two or more fastening portions formed on one side in the drum axial direction for attaching the segments, spaced apart by the uniform separation distance L, and for each of the plurality of types of segments, the distance in the drum circumferential direction from a first end in the drum circumferential direction to the nearest fastening portion is α, and the distance in the drum circumferential direction from a second end opposite the first end in the drum circumferential direction to the nearest fastening portion is L-α. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing an example of an indoor drum testing machine 1 equipped with a traveling drum 2. [Diagram 2] FIG. 2 is a schematic diagram showing the configuration of the traveling drum 2 with a plate 21 attached, as viewed from the drum axial direction AD. [Diagram 3] FIG. 4 is a plan view showing a first type divided piece 22a. [Figure 4] FIG. 4 is a plan view showing a second type divided piece 22b. [Diagram 5] FIG. 4 is a plan view showing a third type divided piece 22c. [Figure 6] FIG. 4 is a side view showing a schematic configuration of a traveling drum. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [First embodiment] Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings.

[0012] FIG. 1 is a schematic diagram showing an example of an indoor drum test machine 1 equipped with a traveling drum 2. FIG. 2 is a schematic diagram showing the traveling drum 2 with a plate 21 attached, as viewed from the drum axial direction AD. As shown in FIG. 1, the indoor drum test machine 1 includes the traveling drum 2, a plate 21 that is detachable from the traveling drum 2, a simulated road surface 3 formed on the plate 21, and a tire support 4 that supports a tire T by pressing it against the simulated road surface 3. The traveling drum 2 is rotatably supported by a drum rotation shaft 11 that extends horizontally. A drum power source 12 such as a motor that rotates the traveling drum 2 is connected to the drum rotation shaft 11.

[0013] The tire support 4 supports the tire T by a tire rotation shaft 13 extending horizontally. A tire power source 14 such as a motor capable of applying a driving force or a braking force to the tire rotation shaft 13 is connected to the tire rotation shaft 13. As the tire power source 14, a brake may be used to apply a braking force, or a motor and a brake may be used in combination. A load cell 15 that measures torque and forces in three directions, i.e., front-rear force, left-right force, and vertical force of the tire T, and a fixing member 16 that fixes the tire rotation shaft 13 in the pressing direction (the up-down direction in FIG. 1 ) are attached to the tire rotation shaft 13.

[0014] The tire support 4 includes a lifting device 17 as a pressing means for pressing the tire T against the traveling drum 2. The lifting device 17 raises and lowers the tire power source 14. This allows the tire T attached to the tire rotating shaft 13 to be moved closer to or farther away from the traveling drum 2. The lifting device 17 configured to be able to raise and lower the traveling drum 2 may be used as the pressing means. The load of the tire T is adjusted to a predetermined value by the lifting device 17 based on the vertical force measurement result by the load cell 15, and then the tire rotating shaft 13 is fixed by the fixing member 16, whereby the tire T can be brought into contact with the simulated road surface 3 with a predetermined load.

[0015] The indoor drum test machine 1 includes a control unit 18 that controls the operation of the indoor drum test machine 1. The control unit 18 can be configured using a computer such as a personal computer or a PLC (programmable logic controller). The control unit 18 is electrically connected to the drum power source 12, the tire power source 14, the load cell 15, the fixed member 16, and the lifting device 17, and is configured to be able to control the operation of each of these components.

[0016] The traveling drum 2 has a drum body 20 and a plate 21 that is detachable from the drum body 20. The plate 21 has a curved shape along the drum circumferential direction CD, and can be, for example, an arc shape or a cylindrical shape. As shown in FIG. 2, the outer peripheral surface of the drum body 20 to which the plate 21 is attached is covered with the plate 21 over its entire circumference. The plate 21 is composed of a plurality of divided pieces 22 divided in the drum circumferential direction CD. The plate 21 is formed of a metal material such as aluminum, stainless steel, or iron. The divided pieces 22 are connected in an annular shape and can be attached to the drum body 20. Since FIG. 2 is a schematic diagram, the number of divisions of the plate 21 is illustrated as nine, but the number of divisions can be changed. In addition, in the first embodiment, as described later, 17 divided pieces 22 with different lengths in the drum circumferential direction CD are connected around the drum, but since FIG. 2 is a schematic diagram, the lengths of all the divided pieces 22 in the drum circumferential direction CD are illustrated as being uniform.

[0017] A simulated road surface 3 is provided on the outer peripheral surface of the plate 21 (segment 22). A tire T to be tested is pressed against the simulated road surface 3. The drum body 20 is supported by a drum rotating shaft 11 and configured to be rotatably driven. The simulated road surface 3 is provided on the outer peripheral surface of the drum body 20 via the plate 21. The simulated road surface 3 is arranged around the outer peripheral surface of the drum body 20.

[0018] The plurality of split pieces 22 include a plurality of types of split pieces 22 having different lengths in the drum circumferential direction CD. In the first embodiment, the plurality of split pieces 22 include a first type split piece 22a shown in FIG. 3, a second type split piece 22b shown in FIG. 4, and a third type split piece 22c shown in FIG. 5. FIG. 3 is a plan view showing the first type split piece 22a. FIG. 4 is a plan view showing the second type split piece 22b. FIG. 5 is a plan view showing the third type split piece 22c. As shown in FIGS. 3 to 5, the split pieces 22 (the first type split piece 22a, the second type split piece 22b, and the third type split piece 22c) have fastening parts 23 that fasten the split pieces 22 to the drum body 20. The fastening parts 23 are members that constitute fasteners such as headed bolts, headless bolts, bolt holes, and fixed bolts. In the first embodiment, the drum body 20 is provided with fastening portions 23 as bolt holes, and the divided pieces 22 of the plate 21 are provided with fastening portions 23 as headed bolts and bolt holes, but the combination can be changed as appropriate as long as they are fasteners. Although not shown, the drum body 20 has fastening portions 23 for attaching the divided pieces 22 formed at a uniform separation distance L all around the circumference of the drum. In the first embodiment, the number of bolt holes (fastening portions 23) formed in the drum body 20 on one side of the drum axial direction AD is 85, but this can be changed as appropriate.

[0019] In this manner, since the fastening portions 23 are formed at the uniform separation distance L around the circumference of the drum body 20, deterioration of the mass balance of the drum body 20 can be suppressed.

[0020] As shown in Figs. 3 to 5, each of the divided pieces 22 (first type divided piece 22a, second type divided piece 22b, and third type divided piece 22c) has two or more fastening portions 23 formed at one side in the drum axial direction AD at a uniform distance L. The first type divided piece 22a shown in Fig. 3 is the divided piece 22 with the shortest length in the drum circumferential direction CD, and its length is 4L. The first type divided piece 22a has four fastening portions 23 formed at both ends in the drum axial direction AD at a uniform distance L. The first type divided piece 22a can also be said to be the divided piece 22 with the smallest number of fastening portions 23. The second type divided piece 22b shown in Fig. 4 is the divided piece 22 with the longest length in the drum circumferential direction CD, and its length is 6L. The second type divided piece 22b has six fastening portions 23 formed at both ends in the drum axial direction AD at a uniform distance L. The second type segment piece 22b can be said to be the segment piece 22 with the largest number of fastening portions 23. The length in the drum circumferential direction CD of the third type segment piece 22c shown in Fig. 5 is between the first type segment piece 22a and the second type segment piece 22b, and its length is 5L. The third type segment piece 22c has five fastening portions 23 formed at both ends in the drum axial direction AD spaced apart by a uniform distance L.

[0021] If the length of the longest second type divided piece 22b in the drum circumferential direction CD becomes more than twice the length of the shortest first type divided piece 22a, the higher order components of the noise generated when the tire T passes over the end of the second type divided piece 22b will match the frequency of the noise generated when the tire T passes over the end of the first type divided piece 22a, resulting in an increase in noise. Therefore, as in the first embodiment, it is preferable that the length of the second type divided piece 22b having the longest length in the drum circumferential direction CD is less than twice the length of the first type divided piece 22a having the shortest length in the drum circumferential direction CD. In the first embodiment, the length of the second type divided piece 22b is 6L, which is less than 8L, which is twice the length of the first type divided piece 22a having the shortest length in the drum circumferential direction CD. If the length of the second type divided piece 22b having the longest length in the drum circumferential direction CD is less than twice the length of the first type divided piece 22a having the shortest length in the drum circumferential direction CD, the high-order components of the noise generated when the tire T passes over the end of the second type divided piece 22b do not match the frequency of the noise generated when the tire T passes over the end of the first type divided piece 22a, and an increase in noise can be avoided. In the above, the length in the drum circumferential direction CD is defined, but since the length in the drum circumferential direction CD changes depending on the number of fastening portions 23, the same can be said about the number of fastening portions 23.

[0022] In this way, two or more fastening portions 23 are formed at a uniform distance L apart on one side of the drum axial direction AD for the drum main body 20 and each of the divided pieces 22, so that multiple types of divided pieces 22 having different lengths in the drum circumferential direction CD can be freely arranged and attached to the drum main body 20 regardless of their types.

[0023] 3 to 5, each of the divided pieces 22 (first type divided piece 22a, second type divided piece 22b, third type divided piece 22c) has a plurality of fastening portions 23 arranged such that the distance in the drum circumferential direction CD from the first end S1 in the drum circumferential direction CD to the nearest fastening portion 23 is α, and the distance in the drum circumferential direction CD from the second end S2 on the opposite side of the first end S1 in the drum circumferential direction CD to the nearest fastening portion 23 is L-α. In the first embodiment, α=L / 2, and therefore the distance in the drum circumferential direction CD from the first end S1 in the drum circumferential direction CD to the nearest fastening portion 23 is L / 2, and the distance in the drum circumferential direction CD from the second end S2 on the opposite side of the first end S1 in the drum circumferential direction CD to the nearest fastening portion 23 is L / 2.

[0024] In this way, by specifying the distance in the drum circumferential direction CD from the ends (first end S1, second end S2) in the drum circumferential direction CD to the fastening portion 23 as described above, the same type of divided pieces 22 can be adjacent to each other in the drum circumferential direction CD, and different types of divided pieces 22 can be adjacent to each other in the drum circumferential direction CD, thereby improving convenience. In addition, since it is possible to compare abnormal noises when different arrangement orders are used, it is possible to investigate the arrangement order that produces the least abnormal noises and perform testing with the optimal arrangement order.

[0025] In the first embodiment, six first-type divided pieces 22a are attached to one circumference of the drum. Six second-type divided pieces 22b are attached to one circumference of the drum. Five third-type divided pieces 22c are attached to one circumference of the drum. The number of bolt holes (fastening portions 23) formed in the drum body 20 on one side of the drum axial direction AD is 85, of which the number of fastening portions 23 of the first-type divided pieces 22a is 4×6=24. The number of fastening portions 23 of the second-type divided pieces 22b is 6×6=36. The number of fastening portions 23 of the third-type divided pieces 22c is 5×5=25. Since the total number of fastening portions 23 of the first-type divided pieces 22a, the second-type divided pieces 22b, and the third-type divided pieces 22c is 85, it can be understood that these divided pieces 22 are attached to the drum body 20 around one circumference. The arrangement order of the first type divided pieces 22a, the second type divided pieces 22b and the third type divided pieces 22c can be changed as appropriate, but for example, they can be attached in the order 2 → 1 → 2 → 3 → 1 → 3 → 2 → 1 → 2 → 1 → 2 → 3 → 1 → 3 → 2 → 1 → 3. This is because by making it possible to prevent divided pieces 22 having the same length in the drum circumferential direction CD from being consecutive as much as possible, it is possible to suppress an increase in abnormal noise.

[0026] FIG. 6 is a side view showing a schematic configuration of the traveling drum 2. As shown in FIG. 6, the diameter of the drum body 20 is relatively large, and the drum body 20 is provided inside the floor surface or wall surface of a building. As shown in the figure, a covering member 5 is provided to cover the drum body 20. In the first embodiment, the covering member 5 is the floor surface of the building. As shown in the figure, the covering member 5 has an exposed space 50 that exposes only a part of the circumference of the drum body 20. The exposed space 50 is a space for pressing the tire T against the pseudo road surface 3 provided on the drum body 20, and is a space for attaching the divided pieces 22 having the pseudo road surface 3 to the drum body 20. As shown in the figure, the length K of the exposed space 50 along the drum circumferential direction CD is the maximum length of each divided piece 22 in the drum circumferential direction CD. Therefore, the minimum number X of the divided pieces 22 attached to the drum body 20 around the circumference is the smallest integer that is equal to or greater than the number obtained by dividing the length N of the drum body 20 around the drum by the length K of the exposed space 50 along the drum circumferential direction CD. If a large number of the segments 22 are attached around the drum body 20, the number of times the tire T passes over the ends of the segments 22 increases, so it is preferable to suppress an increase in the number of the segments 22. Therefore, it is preferable that the number of the segments 22 attached around the drum body 20 is equal to or greater than the minimum number X and equal to or less than (X+3).

[0027] [Variations] (A) In the above embodiment, the plurality of segments 22 include three types of segments 22, but at least two types are sufficient.

[0028] (B) In the above embodiment, the number of first type divided pieces 22a, the number of second type divided pieces 22b, and the number of third type divided pieces 22c are not limited to those described above and can be changed as appropriate.

[0029] [1] As described above, in the above embodiment, the method for manufacturing the traveling drum 2 includes the drum main body 20, the plate 21 configured to be detachable from the drum main body 20, and the pseudo road surface 3 formed on the plate 21, and the plate 21 is composed of a plurality of divided pieces 22 divided in the drum circumferential direction CD, and the plurality of divided pieces 22 include a plurality of types of divided pieces (22a, 22b, 22c) having different lengths in the drum circumferential direction CD, The method includes forming fastening portions 23 for attaching the split pieces 22 on the drum body 20 at a uniform separation distance L around the drum, and forming two or more fastening portions 23 for attaching the split pieces 22 on one side of the drum axial direction AD for each of the multiple types of split pieces 22, spaced apart by a uniform separation distance L, wherein for each of the multiple types of split pieces 22, the distance in the drum circumferential direction CD from a first end S1 in the drum circumferential direction CD to the nearest fastening portion 23 is α, and the distance in the drum circumferential direction CD from a second end S2 on the opposite side of the first end S1 in the drum circumferential direction CD to the nearest fastening portion 23 is L-α.

[0030] In this way, the fastening parts 23 are formed on the drum body 20 at the uniform separation distance L around the drum, so that the number of fastening parts 23 formed on the drum body 20 can be kept to a minimum, and a decrease in the rigidity of the drum body 20 can be suppressed, compared to when the fastening parts 23 are formed at multiple separation distances to accommodate all of the multiple types of divided pieces 22. Furthermore, when the fastening parts 23 are formed at multiple separation distances, there may be cases where a new fastening part 23 to be formed overlaps an existing fastening part 23, making it impossible to form a new fastening part 23; however, with this method, the fastening parts 23 are formed at the uniform separation distance L around the drum, so that such an event does not occur. In addition, since the fastening portions 23 are formed at the uniform separation distance L around the circumference of the drum body 20, deterioration of the mass balance can be suppressed. Furthermore, by specifying the distance from the end in the drum circumferential direction CD to the fastening portion 23 as described above, any type of split pieces 22 can be attached adjacent to each other to the drum body 20, improving convenience. Also, since it is possible to compare abnormal noises when different arrangement orders are used, it is possible to investigate the arrangement order that produces the least amount of abnormal noise and perform testing with the optimal arrangement order.

[0031] [2] In the manufacturing method of the traveling drum 2 described in [1] above, α may be L / 2. In this way, it becomes possible to rotate the mounting orientation of the divided pieces 22 by 180°. In addition, since it is possible to compare abnormal noises when the divided pieces 22 are mounted in different orientations, it becomes possible to investigate the arrangement order that produces the least amount of abnormal noises while taking the orientation into consideration, and to perform testing in the optimal orientation and arrangement order.

[0032] [3] In the manufacturing method of the running drum 2 described in [1] or [2] above, the multiple types of split pieces 22 may include a first type split piece 22a having the shortest length in the drum circumferential direction CD and a second type split piece 22b having the longest length in the drum circumferential direction CD, and the length in the drum circumferential direction CD of the second type split piece 22b may be less than twice the length in the drum circumferential direction CD of the first type split piece 22a. If the length of the second-type divided pieces 22b in the drum circumferential direction CD is more than twice the length of the first-type divided pieces 22a in the drum circumferential direction CD, the higher-order components of the noise generated when the tire T passes over the end of the second-type divided pieces 22b will match the frequency of the noise generated when the tire T passes over the end of the first-type divided pieces 22a, increasing the noise. Therefore, by making the length of the second-type divided pieces 22b in the drum circumferential direction CD less than twice the length of the first-type divided pieces 22a in the drum circumferential direction CD, it is possible to avoid the increase in noise.

[0033] [4] In the manufacturing method of the traveling drum 2 described in any one of [1] to [3] above, the traveling drum 2 has a covering member 5 that covers the drum body 20, the covering member 5 has an exposed space 50 that exposes only a part of the circumference of the drum body 20, and the number of the divided pieces 22 attached to the drum body 20 around the circumference is equal to or greater than the minimum number X of the divided pieces 22 and equal to or less than (X+3), and the minimum number X may be the smallest integer that is equal to or greater than the number obtained by dividing the length N of the drum body 20 around the drum by the length K of the exposed space 50 along the drum circumferential direction CD. According to this configuration, the number of segments 22 attached around the drum body 20 can be reduced, and the number of times the tire T passes over the ends of the segments 22 can be reduced, thereby suppressing the generation of noise.

[0034] [5] As in the above embodiment, the traveling drum 2 comprises a drum main body 20, a plate 21 configured to be freely attached and detached to the drum main body 20, and a pseudo road surface 3 formed on the plate 21, and the plate 21 is composed of a plurality of divided pieces 22 divided in the drum circumferential direction CD, and the plurality of divided pieces 22 include a plurality of types of divided pieces 22 having different lengths in the drum circumferential direction CD, and the drum main body 20 has fastening portions 23 for attaching the divided pieces 22 formed at a uniform distance L around the drum, and each of the plurality of types of divided pieces 22 has two or more fastening portions 23 formed at a uniform distance L on one side of the drum axial direction AD for attaching the divided pieces 22, and the distance in the drum circumferential direction CD from the first end S1 in the drum circumferential direction CD to the nearest fastening portion 23 is α, and the distance in the drum circumferential direction CD from the second end S2 opposite the first end S1 in the drum circumferential direction CD to the nearest fastening portion 23 is L-α. It is possible to obtain the same effects as in the manufacturing method of the traveling drum 2 described above.

[0035] Although the embodiments of the present disclosure have been described above based on the drawings, the specific configurations should not be considered to be limited to these embodiments. The scope of the present disclosure is indicated not only by the description of the above-mentioned embodiments but also by the claims, and further includes all modifications within the meaning and scope equivalent to the claims.

[0036] The structures employed in the above-described embodiments may be employed in any other embodiment. The specific configurations of the components are not limited to the above-described embodiments, and may be modified in various ways without departing from the spirit of the present disclosure. [Explanation of symbols]

[0037] 2: Traveling drum 3: Simulated road surface 5: Covering material 20: Drum body 21: Plate 22: Split piece 22a: Type 1 split piece 22b: Type 2 divided piece 23: Fastening part 50: Exposure space CD: Drum circumferential direction L: Uniform separation distance S1: 1st end S2: 2nd end X: Minimum number

Claims

1. A method for manufacturing a traveling drum, The traveling drum includes a drum body, a plate that is detachably attached to the drum body, and a pseudo road surface formed on the plate, and the plate is composed of a plurality of divided pieces that are divided in the drum circumferential direction, and the plurality of divided pieces include a plurality of types of divided pieces that have different lengths in the drum circumferential direction. fastening portions for attaching the divided pieces to the drum body are formed at a uniform distance L around the circumference of the drum; For each of the plurality of types of split pieces, two or more fastening portions are formed at one side in the drum axial direction for attaching the split pieces, the fastening portions being spaced apart by the uniform spacing distance L; Including, A method for manufacturing a traveling drum, wherein each of the plurality of types of split pieces has a circumferential distance α from a first end in the drum circumferential direction to the nearest fastening portion, and a circumferential distance L-α from a second end opposite the first end in the drum circumferential direction to the nearest fastening portion.

2. The method for manufacturing a traveling drum according to claim 1 , wherein the α is L / 2.

3. The method for manufacturing a running drum as described in claim 1, wherein the multiple types of segments include a first type segment having the shortest length in the drum circumferential direction and a second type segment having the longest length in the drum circumferential direction, and the length of the second type segment in the drum circumferential direction is less than twice the length of the first type segment in the drum circumferential direction.

4. The traveling drum has a covering member that covers the drum main body, and the covering member has an exposed space that exposes only a portion of the circumference of the drum main body, The number of the divided pieces attached to the drum body around the circumference is equal to or greater than the minimum number X of the divided pieces and equal to or less than (X+3), and the minimum number X is the smallest integer equal to or greater than the number obtained by dividing the length N of the drum body around the circumference by the length K of the exposed space along the drum circumferential direction. The method for manufacturing a traveling drum according to any one of claims 1 to 3.

5. The device comprises a drum body, a plate configured to be detachable from the drum body, and a pseudo road surface formed on the plate, The plate is composed of a plurality of divided pieces divided in the circumferential direction of the drum, The plurality of segments include a plurality of types of segments having different lengths in the drum circumferential direction, The drum body has fastening portions for attaching the divided pieces formed at a uniform distance L around the circumference of the drum, Each of the plurality of types of split pieces has two or more fastening portions formed on one side in the drum axial direction for attaching the split pieces, the fastening portions being spaced apart by the uniform spacing distance L, A running drum, in which, for each of the plurality of types of divided pieces, the distance in the drum circumferential direction from a first end in the drum circumferential direction to the nearest fastening portion is α, and the distance in the drum circumferential direction from a second end opposite the first end in the drum circumferential direction to the nearest fastening portion is L-α.

Images