Method for manufacturing a travel drum and travel drum

Abstract

To provide a method of manufacturing a running drum and the running drum capable of accurately testing the tire performance.SOLUTION: A method of manufacturing a running drum includes the steps of: installing, on a drum body 20, a formwork 4 including a pair of circumferential frames 41 extending in a drum circumferential direction and spaced apart from each other in a drum axial direction and an axial frame 42 which divides a molding space S sandwiched between the pair of circumferential frames in the drum circumferential direction; and filling a composition 5 constituting the pseudo road surface into the molding space divided by the axial frame 42 and curing the composition. The axial frames 4 installed adjacently in the drum circumferential direction are different from each other in shape as viewed in the drum radial direction.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a running drum used in tire performance tests and a running drum.

Background Art

[0002] Conventionally, bench tests have been conducted indoors to evaluate tire performance such as noise and axial force. In such bench tests, generally, a bench test apparatus having a running drum including a cylindrical pseudo-road surface and a drum body supporting the pseudo-road surface is used.

[0003] Patent Documents 1 and 2 each describe a method for manufacturing a running drum in which an uncured composition is filled into a molding space within a mold installed on the outer peripheral surface of a drum body and cured to form a pseudo-road surface. The molding space is divided in the circumferential direction of the drum at an appropriate length so that the filled composition does not flow down. Therefore, while shifting the position of the molding space in the circumferential direction of the drum, the filling and curing of the composition are repeated to form a cylindrical pseudo-road surface. Therefore, joints of the composition are formed at a plurality of locations in the circumferential direction of the pseudo-road surface.

[0004] When a tire runs on such a pseudo-road surface, inputs caused by the joints occur at regular intervals, and thus there is a risk of adversely affecting the test accuracy of tire performance such as noise and axial force due to an increase in frequency components such as vibrations associated therewith. In Patent Documents 1 and 2, although it is suggested that when installing an axial frame forming a joint, the distances between adjacent axial frames in the circumferential direction of the drum are arranged differently, no specific form suitable therefor is disclosed. Also, simply varying the distances between adjacent axial frames in the circumferential direction of the drum may not result in a sufficient improvement effect.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] This disclosure has been made in view of the above circumstances, and its purpose is to provide a method for manufacturing a running drum and a running drum that can accurately test tire performance. [Means for solving the problem]

[0007] The present disclosure is a method for manufacturing a running drum, comprising a cylindrical pseudo-road surface and a drum body supporting the pseudo-road surface, wherein the method includes the steps of installing a mold on the drum body or a mounting member detachably configured to be attached to the drum body, the mold including a pair of circumferential frames extending in the circumferential direction of the drum and arranged at a distance from each other in the axial direction of the drum, and an axial frame that divides the molding space sandwiched between the pair of circumferential frames in the circumferential direction of the drum, and filling the molding space divided by the axial frame with a composition constituting the pseudo-road surface and hardening it, wherein the axial frames installed adjacent to each other in the circumferential direction of the drum have different shapes when viewed in the radial direction of the drum.

[0008] The traveling drum of this disclosure comprises a cylindrical pseudo-road surface and a drum body supporting the pseudo-road surface, wherein the pseudo-road surface has multiple joints of composition formed at a plurality of locations in the circumferential direction of the drum, and the joints formed adjacent to each other in the circumferential direction of the drum cause the shapes of the joints to differ from each other when viewed in the radial direction of the drum. [Brief explanation of the drawing]

[0009] [Figure 1] A schematic diagram showing an example of a bench-mounted test apparatus with a traveling drum. [Figure 2] Schematic diagram showing the traveling drum as viewed from the drum axis direction. [Figure 3] Perspective view of the drum body with the formwork installed. [Figure 4] (A) Plan view unfolded drawing of the drum body after the installation process, and (B) Plan view unfolded drawing of the drum body after the first filling process. [Figure 5] (A) Plan view of the drum body after the removal process, and (B) Plan view of the drum body after the second filling process. [Figure 6] A schematic diagram showing a part of the formwork. [Figure 7] Schematic diagram showing a modified formwork. [Figure 8] Schematic diagram showing a modified formwork. [Figure 9] Schematic diagram showing a modified formwork. [Figure 10] Schematic diagram showing a modified formwork. [Figure 11] Perspective view showing an example of a mounting component. [Modes for carrying out the invention]

[0010] First, a brief explanation will be given of the configuration of a bench test apparatus having a running drum. Figure 1 shows an example of a bench test apparatus used for testing tire performance such as noise. The bench test apparatus 1 shown in Figure 1 has a running drum 2 on which a tire T is pressed against its outer surface. The running drum 2 is rotatably supported by a horizontally extending drum rotation shaft 11. A drum power source 12, such as a motor that rotates the running drum 2, is connected to the drum rotation shaft 11. A simulated road surface 3 is provided on the outer surface of the running drum 2. The tire T pressed against the outer surface of the running drum 2 is in contact with the simulated road surface 3.

[0011] The tire T is rotatably supported by a horizontally extending tire rotation shaft 13. A tire power source 14, such as a motor, which can apply driving or braking force to the tire rotation shaft 13, is connected to the tire rotation shaft 13. The tire power source 14 may be a brake to apply braking force, or a motor and brake may be used in combination. A load cell 15 for measuring torque and longitudinal force of the tire T, and a fixing member 16 for fixing the tire rotation shaft 13 in the pressing direction (up and down direction in Figure 1) are attached to the tire rotation shaft 13.

[0012] The bench testing apparatus 1 includes a lifting device 17 as a pressing means for pressing the tire T against the travel drum 2. The lifting device 17 raises and lowers the tire power source 14. This allows the tire T, which is attached to the tire rotation shaft 13, to be moved closer to or further away from the travel drum 2. A lifting device configured to raise and lower the travel drum 2 may also be used as the pressing means. Based on the measurement results from the load cell 15, the load on the tire T is adjusted to a predetermined value by the lifting device 17, and then the tire rotation shaft 13 is fixed with the fixing member 16, thereby allowing the tire T to be brought to ground with a predetermined load.

[0013] The bench-mounted testing apparatus 1 includes a control unit 18 that controls the operation of the bench-mounted testing apparatus 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 fixing member 16, and the lifting device 17, and is configured to control the operation of each of these parts.

[0014] FIG. 2 shows the traveling drum 2 as viewed from the drum axis direction (the direction along the drum rotation axis 11). The traveling drum 2 includes a cylindrical pseudo road surface 3 and a drum body 20 that supports the pseudo road surface 3. The tire T to be tested is pressed against the pseudo road surface 3 provided on the outer peripheral surface of the traveling drum 2. The pseudo road surface 3 is formed, for example, in accordance with the particle size curve of the ISO road surface standard (refer to the allowable range of the particle size curve of the asphalt mixture described in Appendix C Design Guidelines of ISO 10844), but is not limited thereto.

[0015] In the present embodiment, the pseudo road surface 3 is formed by curing a composition prepared by blending an aggregate and a binder. The aggregate has, for example, a maximum aggregate grain size of 8 mm (the allowable range is 6.3 mm to 10 mm), and the target particle size curve of the aggregate is within the range of the particle size curve of the ISO road surface standard. In accordance with this, a mixture of coarse aggregate, fine aggregate, and filler is used. As the binder, for example, a known synthetic resin is used, but from the viewpoint of ensuring the bonding strength with the aggregate and the bonding strength with the outer peripheral surface of the drum body 20, an epoxy resin is preferably used. Although not shown in FIG. 2, joints of the composition are formed at a plurality of locations in the drum circumferential direction on the pseudo road surface 3.

[0016] Next, a method for manufacturing the traveling drum will be described. The method for manufacturing the traveling drum 2 in the present embodiment includes an installation step, a first filling step, a removal step, and a second filling step. By passing through the steps including these, the pseudo road surface 3 can be provided on the drum body 20, whereby the traveling drum 2 shown in FIGS. 1 and 2 is manufactured.

[0017] As a method for manufacturing the traveling drum 2, first, a drum body 20 is prepared. The drum body 20 is held rotatably, for example, with the drum axis direction being horizontal. Next, as shown in FIG. 3, a mold 4 is installed on the drum body 20 (installation step). The mold 4 protrudes radially outward from the outer peripheral surface of the drum body 20. The mold 4 includes a pair of circumferential frames 41 and an axial frame 42. The pair of circumferential frames 41 extend in the drum circumferential direction and are arranged at a distance in the drum axial direction. The axial frame 42 divides the molding space S formed between the pair of circumferential frames 41 in the drum circumferential direction.

[0018] FIG. 4(A) is a plan view development of the drum body 20, and the drum central axis 2C is shown by a chain line. The axial frame 42 extends along the drum axial direction so as to connect the pair of circumferential frames 41. The molding space S formed between the pair of circumferential frames 41 is divided into a plurality of molding spaces S1, S2, S3,... by a plurality of axial frames 42 arranged at intervals in the drum circumferential direction. Although it is desirable to increase the drum circumferential length of each molding space S1, S2, S3,... from the viewpoint of reducing the number of joints, if it is excessively large, the uncured composition will flow down. Therefore, the interval of the axial frames 42 is appropriately determined in consideration of their balance.

[0019] Subsequently, as shown in FIG. 摘要:本发明涉及一种走行鼓2的制造方法,首先准备鼓体20,鼓体20可水平旋转,接着安装型框4,型框4包括周向框41和轴向框42,轴向框42将成型空间S分为多个成型空间。图4(A)为鼓体20的平面展开图,轴向框42连接周向框41,成型空间S被轴向框42分为多个成型空间S1、S2、S3等,轴向框42的间隔要考虑平衡。随后在成型空间S1中填充并硬化构成疑似路面3的未硬化组合物5,填充的成型空间S1预先布置在上方,周向框41可环形形成,也可布置在包含未硬化组合物5的成型空间范围内。4(B), an uncured composition 5 constituting the pseudo road surface 3 is filled into the molding space S1 divided by the axial frame 42 and cured (first filling step). The molding space S1 into which the composition 5 is filled is arranged in advance upward (near the 12 o'clock direction when viewed from the drum axial direction) so that the filled uncured composition 5 does not flow down. In the present embodiment, the circumferential frame 41 is formed in an annular shape along the drum circumferential direction. However, it is not limited to this, and the circumferential frame

[0020] As shown in Figure 5(A), after the filled composition 5 has hardened, the axial frame 42 in contact with the composition 5 is removed (removal step). This exposes the end face 5e of the composition 5 that was in contact with the side wall surface (the surface facing the circumferential direction of the drum) of the axial frame 42. The shape of the exposed end face 5e in a view in the radial direction of the drum (for example, a plan view) corresponds to the shape of the axial frame 42 that was in contact with that end face 5e. This removal step may be performed before the composition 5 has completely hardened, provided that the composition 5 has hardened to the extent that the shape of the end face 5e does not deteriorate significantly (to the extent that it does not deform under gravity).

[0021] After the removal process, as shown in Figure 5(B), the uncured composition 5 constituting the pseudo-road surface 3 is filled into the molding space S2 opposite to the end face 5e of composition 5 that was in contact with the removed axial frame 42 and cured (second filling process). The molding space S2 into which composition 5 is filled is positioned above in advance to prevent the uncured composition 5 from flowing out. At this stage, one side of the molding space S2 in the drum circumferential direction is separated by the axial frame 42, and the other side is separated by the end face 5e of composition 5. The composition 5 filled into the molding space S2 adheres to the composition 5 that has been filled into the molding space S1 and cured, and a joint 50 is formed between them.

[0022] After the composition 5 filled into the molding space S2 has hardened, the axial frame 42 in contact with the composition 5 is removed. Then, the unhardened composition 5 is filled into the molding space S3 opposite the end face of the composition 5 that has been exposed and hardened. This is done in the same manner as filling and hardening the composition 5 into the molding space S2. Thus, the second filling step becomes the first filling step in the next molding cycle, and thereafter the removal step and the (second) filling step are repeated. A cylindrical pseudo-road surface 3 is formed by connecting a full circumference of composition 5 along the circumferential direction of the drum.

[0023] Figure 6 is a schematic unfolded view showing a part of the mold frame 4. In Figure 6, the vertical direction corresponds to the drum axis direction, and the horizontal direction corresponds to the drum circumferential direction (the same applies to Figures 7 to 10). Figure 6 shows molding spaces S1 to S5, which are among the multiple molding spaces separated by the axial frame 42. In this embodiment, the axial frames 42 installed adjacent to each other in the drum circumferential direction have different shapes when viewed in the drum radial direction. For example, axial frames 42A and axial frame 42B, which are adjacent in the drum circumferential direction, have different shapes, and similarly, axial frame 42B and axial frame 42C have different shapes.

[0024] As shown in Figure 6, the spacing of the axial frames 42 changes in the direction of the drum axis. Therefore, even if the circumferential pitch of the installation locations of the axial frames 42 is constant at any position in the direction of the drum axis (for example, the intermediate position 41c between a pair of circumferential frames 41), fluctuations will occur at other positions (for example, positions close to the circumferential frames 41). The same applies to the circumferential pitch at the locations where the joints 50 are formed. Therefore, it is possible to disperse the frequency components caused by the joints 50 and suppress adverse effects on the accuracy of tire performance testing. Moreover, it is easy to make the fluctuation pattern of the circumferential pitch different in the direction of the drum axis, and a sufficient improvement effect can be obtained.

[0025] The axial frame 42 extends at an angle with respect to the drum axis. As a result, a joint 50 (see Figure 5(B)) is formed that extends at an angle with respect to the drum axis. This prevents the tire contact surface from simultaneously colliding with the joint on the pressing side or simultaneously separating from the joint on the pushing side when the tire is driven on the simulated road surface 3. For example, the timing of the collision of the pressing side of the tire contact surface will differ between one side and the other side in the direction of the drum axis. As a result, it is possible to prevent large inputs caused by the joint 50 from being applied to the tire, and to test the tire performance with accuracy.

[0026] The acute angle θ of the axial frame 42 with respect to the drum axis is preferably 30 to 60 degrees. The angle θ is determined based on a straight line connecting both ends of the axial frame 42. When the angle θ exceeds 30 degrees, the effect of preventing large inputs caused by the seams 50 as described above is more effectively achieved. Also, when the angle θ is less than 60 degrees, the drum circumferential length L of the molding space (molding space S1, etc.) separated by the axial frame 42 does not become too large, and the number of seams 50 is reduced. The relationship between the length L of the molding space and the number of seams 50 will be explained later.

[0027] In the example shown in Figure 6, the axial frames 42 installed adjacent to each other in the circumferential direction of the drum are tilted in different directions relative to the drum axis, thereby resulting in different shapes when viewed radially from the drum. The tilt angle θ of the axial frames 42 with respect to the drum axis is the same for all of them, but as will be described later, it is possible to make the tilt angle θ different in place of or in addition to the direction of tilt.

[0028] The axial frame 42 shown in Figure 7 extends at an inclination with respect to the drum axis direction. In this example, the angle θ of inclination with respect to the drum axis direction is made different for axial frames 42 installed adjacent to each other in the circumferential direction of the drum, thereby making their shapes different when viewed radially from the drum. The direction of inclination of the axial frames 42 with respect to the drum axis direction is the same for all of them, but the angle θ may be different, and the direction of inclination may also be different as shown in Figure 6. In other words, it is possible to make both the direction of inclination and the angle θ of axial frames 42 installed adjacent to each other in the circumferential direction of the drum different from each other, which is convenient for increasing the variations in the shape of the axial frame 42.

[0029] There should be at least two types of shapes for the axial frame 42 when viewed in the radial direction of the drum (see Figure 6). However, from the viewpoint of increasing the variations in the shape of the axial frame 42 and making it easier to enhance the dispersion effect of frequency components caused by the joints 50, it is preferable that there be three or more types of shapes for the axial frame 42 when viewed in the radial direction of the drum, as shown in Figure 7 and Figures 8 to 10 described later, and more preferably four or more types. It is also effective to make all the shapes of the axial frame 42 included in the formwork 4 different when viewed in the radial direction of the drum. In that case, the number of types of shapes for the axial frame 42 when viewed in the radial direction of the drum will be the same as the number of installation locations for the axial frame 42.

[0030] The axial frame 42 may be formed in a linear, curved, bent, zigzag, or a combination thereof when viewed in the radial direction of the drum. Figures 6 and 7 show examples in which the axial frame 42 is formed in a linear shape when viewed in the radial direction of the drum, but it is not limited to this, and may be non-linear as shown in Figures 8 and 9. The direction of inclination and the angle of inclination of a non-linear axial frame 42 are determined based on a straight line connecting both ends of the axial frame 42.

[0031] Figure 8 shows an example where the axial frame 42 is formed in a curved shape when viewed radially from the drum, and each axial frame 42 extends at an inclination with respect to the drum axis. In Figure 8(A), the direction of inclination of the axial frames 42 with respect to the drum axis is different from each other. In Figure 8(B), the angle of inclination of the axial frames 42 with respect to the drum axis is different. Instead of or in addition to the direction and angle of inclination, the direction of curvature or curvature may also be different. In Figure 8(C), the number of inflection points of the axial frame 42 is different. In this way, in Figures 8(A) to (C), the shapes of the axial frames 42 installed adjacent to each other in the circumferential direction of the drum are different when viewed radially from each other.

[0032] Figure 9 shows examples where the axial frame 42 is formed in a bent or zigzag shape when viewed radially from the drum, and all of the axial frames 42 extend at an inclination with respect to the drum axis. In Figure 9(A), the direction of inclination of the axial frames 42 with respect to the drum axis is different from each other. In Figure 9(B), the angle of inclination of the axial frames 42 with respect to the drum axis is different. In Figure 9(C), the number of inclination points of the axial frames 42 is different. In this way, in Figures 9(A) to (C), the shapes of the axial frames 42 installed adjacent to each other in the circumferential direction of the drum are different when viewed radially from each other.

[0033] In Figure 9, both ends of the axial frame 42 extend parallel to the drum axis direction. By making the ends of the axial frame 42 parallel to the drum axis direction in this way, the length L of the molding space (see Figure 6) is reduced. The molding space needs to be of an appropriate length so that the filled composition 5 does not flow out. If the molding space becomes excessively long, the spacing between the axial frames 42 must be reduced. However, this increases the number of divisions by the axial frames 42, and consequently the number of seams 50. Therefore, by not making the molding space excessively long, the number of seams 50 can be reduced.

[0034] In Figure 10(A), linear, curved, and zigzag axial frames 42 are used in combination. In Figure 10(B), the axial frames 42 are formed in a V-shape or U-shape when viewed radially from the drum. The axial frame 42D is formed in a V-shape by combining two straight lines. The axial frame 42E is formed in a V-shape by combining two curves (arcs). The axial frame 42F is formed in a U-shape. In this way, in Figures 10(A) and (B), the shapes of the axial frames 42 installed adjacent to each other in the circumferential direction of the drum are different when viewed radially from the drum.

[0035] From the viewpoint of preventing large inputs caused by the tire contact surfaces simultaneously colliding with or separating from the joint 50, it is preferable that the formwork 4 does not include axial frames 42 that extend parallel to the drum axis direction (i.e., angle θ is 0 degrees), and it is more preferable that it does not include axial frames 42 with an angle θ of less than 30 degrees.

[0036] Examples of materials for the formwork 4 include elastic materials such as rubber, metals such as aluminum alloys, resins (plastics), ceramics, and wood, but are not particularly limited. The circumferential frame 41 may be made of the same material as the axial frame 42, or it may be made of a different material. When the circumferential frame 41 and / or the axial frame 42 are made of an elastic material such as rubber, there is an advantage in that they can be curved to match the curvature of the outer surface of the drum body 20 and easily made to adhere closely to the outer surface of the drum body 20. Furthermore, by appropriately deforming the axial frame 42 made of an elastic material, various shapes of the axial frame 42, as illustrated in Figure 8, can be obtained.

[0037] The traveling drum 2 of this embodiment is manufactured by the method described above. Therefore, the traveling drum 2 comprises a cylindrical pseudo-road surface 3 and a drum body 20 that supports the pseudo-road surface 3, and multiple joints of composition 50 are formed on the pseudo-road surface 3 in the circumferential direction of the drum. Furthermore, the joints 50 formed adjacent to each other in the circumferential direction of the drum have different shapes when viewed in the radial direction of the drum.

[0038] It is preferable that the direction of inclination, the angle of inclination, or both of the joints 50 formed adjacent to each other in the circumferential direction of the drum differ from each other with respect to the drum axis direction. The joints 50 may be formed in a linear, curved, bent, zigzag, or a combination thereof when viewed in the radial direction of the drum. It is preferable that there are three or more different shapes of the joints 50 when viewed in the radial direction of the drum. It is preferable that all the shapes of the joints 50 formed on the pseudo-road surface 3 when viewed in the radial direction of the drum differ from each other.

[0039] In this embodiment, a method is employed in which the pseudo-road surface 3 is directly applied to the main drum 20 by installing a formwork 4 on the main drum 20 and filling and curing the composition as described above, but the method is not limited to this. For example, a method may be employed in which the formwork 4 is installed on a mounting member that is detachably configured on the drum body 20, the composition is filled and cured, and then the mounting member is attached to the main drum 20 to apply the pseudo-road surface 3. Figure 11 shows an example of a mounting member used in such a method.

[0040] The mounting member 60 shown in Figure 11 is formed from an arc-shaped plate material curved along the circumferential direction of the drum. The outer surface of the mounting member 60 is provided with a hardened composition 5 that will become part of the simulated road surface 3. This composition 5 is formed by filling and hardening the unhardened composition as described above after installing a mold 4 (not shown in Figure 11) on the mounting member 60. The mounting member 60 is provided with mounting holes 60h for attachment to the outer surface of the drum body 20. By arranging a plurality of mounting members 60 in a ring shape around the outer circumference of the drum body 20, a cylindrical simulated road surface 3 supported by the drum body 20 is provided.

[0041] [1] As described above, this embodiment is a method for manufacturing a running drum 2 comprising a cylindrical simulated road surface 3 and a drum body 20 supporting the simulated road surface 3, comprising the steps of: installing a mold 4 on the drum body 20 or a mounting member 60 detachably configured on the drum body 20, which includes a pair of circumferential frames 41 extending in the circumferential direction of the drum and arranged at a distance from each other in the axial direction of the drum, and an axial frame 42 that divides the molding space S sandwiched between the pair of circumferential frames 41 in the circumferential direction of the drum; and filling the molding space divided by the axial frame 42 with a composition 5 constituting the simulated road surface 3 and hardening it, wherein the axial frames 42 installed adjacent to each other in the circumferential direction of the drum have different shapes when viewed in the radial direction of the drum. As a result, the circumferential pitch of the joints 50 fluctuates in the axial direction of the drum, thereby dispersing frequency components caused by the joints 50 and suppressing adverse effects on the test accuracy of tire performance such as noise and axial force.

[0042] [2] In the method for manufacturing the running drum described in [1] above, it is preferable that the axial frames 42 installed adjacent to each other in the circumferential direction of the drum have different directions of inclination with respect to the drum axis, different angles of inclination, or both. This allows for an appropriate dispersion effect of frequency components caused by the joints 50. Furthermore, because the axial frames 42 extend at an inclination with respect to the drum axis, it is possible to prevent large inputs caused by the tire contact surfaces simultaneously colliding with or separating from the joints 50.

[0043] [3] In the manufacturing method of the traveling drum described in [1] or [2] above, the axial frame 42 may be formed in a linear, curved, bent, zigzag, or a combination thereof when viewed in the radial direction of the drum. Various shapes like these can be used for the axial frame 42.

[0044] [4] In any one of the above [1] to [3] methods for manufacturing a traveling drum, it is preferable that there are three or more types of shapes of the axial frame 42 when viewed in the radial direction of the drum. Increasing the variations in the shape of the axial frame 42 is convenient for improving the dispersion effect of frequency components caused by the joints 50.

[0045] [5] In any one of the above methods for manufacturing a traveling drum [1] to [4], it is preferable that the shapes of the axial frames 42 included in the mold 4 in the radial direction of the drum are all different from each other. This makes it possible to more effectively improve the dispersion effect of frequency components caused by the joints 50.

[0046] [7] Furthermore, the running drum 2 of this embodiment comprises a cylindrical simulated road surface 3 and a drum body 20 that supports the simulated road surface 3. Multiple joints 50 of composition 5 are formed on the simulated road surface 3 in the circumferential direction of the drum, and the joints 50 formed adjacent to each other in the circumferential direction of the drum have different shapes when viewed in the radial direction of the drum. As a result, the circumferential pitch of the joints 50 fluctuates in the axial direction of the drum, which disperses the frequency components caused by the joints 50 and suppresses adverse effects on the test accuracy of tire performance such as noise and axial force.

[0047] While embodiments of this disclosure have been described above, it should be understood that the specific configuration is not limited to these embodiments. The scope of this disclosure is defined not only by the above-described embodiments but also by the claims, and further includes all modifications within the meaning and scope of equivalence to the claims.

[0048] Therefore, for example, in the above-described embodiment, the traveling drum 2 is shown as an outer drum that drives by pressing the tire T against its outer circumferential surface, but it is not limited to this, and may be an inner drum that drives by pressing the tire against its inner circumferential surface. In that case, a mold can be installed on the inner circumferential surface of the cylindrical drum body, or a mold can be installed on a mounting member that is detachably configured on the inner circumferential surface of the drum body, and the simulated road surface can be formed in the same manner as in the above-described embodiment. In addition, in the first and second filling steps, it is preferable that the molding space into which the composition is filled is located downwards (around the 6 o'clock position when viewed from the drum axis direction).

[0049] The manufacturing method and the traveling drum described herein are not limited in any way to the embodiments described above, and various improvements and modifications are possible without departing from the spirit of the invention. Furthermore, the components used in the embodiments described above can be used in any combination. [Explanation of symbols]

[0050] 1. On-board testing apparatus 2. Travel drum 3 Simulated road surface 4 Formwork 5 Composition 5e End face 20 Drum Body 41 Circumferential Frame 42 Axial frame 50 joints 60 Mounting components

Claims

1. A method for manufacturing a traveling drum comprising a cylindrical simulated road surface and a drum body supporting the simulated road surface, A step of installing a mold on the drum body or a mounting member detachably configured on the drum body, the mold includes a pair of circumferential frames extending in the circumferential direction of the drum and arranged at a distance from each other in the axial direction of the drum, and an axial frame that divides the molding space sandwiched between the pair of circumferential frames in the circumferential direction of the drum. The process includes filling the molding space partitioned by the axial frame with the composition constituting the simulated road surface and allowing it to harden, A method for manufacturing a traveling drum, characterized in that the axial frames, which are installed adjacent to each other in the circumferential direction of the drum, have different shapes when viewed in the radial direction of the drum.

2. The method for manufacturing a traveling drum according to claim 1, wherein the axial frames installed adjacent to each other in the circumferential direction of the drum have different directions of inclination with respect to the drum axis direction, angles of inclination, or both.

3. The method for manufacturing a traveling drum according to claim 1, wherein the axial frame is formed in a linear, curved, bent, zigzag, or a combination thereof shape when viewed in the radial direction of the drum.

4. The method for manufacturing a traveling drum according to any one of claims 1 to 3, wherein there are three or more types of shapes of the axial frame when viewed in the radial direction of the drum.

5. The method for manufacturing a traveling drum according to claim 4, wherein the shapes of the axial frames included in the mold are all different from each other when viewed in the radial direction of the drum.

6. It comprises a cylindrical simulated road surface and a drum body that supports the simulated road surface, The aforementioned simulated road surface has multiple joints formed in the composition at various locations in the circumferential direction of the drum. The aforementioned joint is formed in a straight line when viewed in the radial direction of the drum and is inclined with respect to the axial direction of the drum. A traveling drum in which the joints formed adjacent to each other in the circumferential direction of the drum have different directions of inclination with respect to the drum axis, different angles of inclination, or both, thereby causing the shapes of the drums to differ from each other in a radial view.

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