Tire

Abstract

The nonwoven body of the present invention comprises a plurality of metal fibers having a convex polygonal shape in cross section orthogonal to the length direction.

Description

TECHNICAL FIELD

[0001] The present application relates to a nonwoven body and a tire. BACKGROUND

[0002] A tire configured with a coil spring has been known in the past. For example, a tire is disclosed in Patent Literature 1 in which a plurality of coil springs are combined with other coil springs and fixed to a ring-shaped rim, thereby being formed into a ring shape as a whole.

[0003] Further, a tire including a skeleton portion and a tread member is disclosed in Patent Literature 2. The skeleton portion of Patent Literature 2 includes a rim member, a plurality of main springs, and a plurality of link springs.

[0004] Prior art documents

[0005] Patent documents

[0006] Patent Literature 1: International Publication No. 2010 / 138150

[0007] Patent Literature 2: Japanese Patent Application Publication No. 2020-192930 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] In the tire disclosed in Patent Literature 1, the wheel is configured with springs such as coil springs, and since there are many gaps between the springs, depending on the environment in which the tire is used, sometimes the tire cannot be properly used. For example, in the case where the tire disclosed in Patent Literature 1 is used on sand or the like, sometimes the tire is buried in the ground due to sand entering the gaps between the coil springs. Further, in the case where sand enters the rotation center side of the wheel from the gaps between the coil springs and there is a drive mechanism or the like on the rotation center side of the wheel, for example, the drive mechanism can be caused to malfunction. Thus, in the tire disclosed in Patent Literature 1, sometimes the desired driving performance or the like is degraded.

[0010] In contrast, the tire disclosed in Patent Literature 2 is provided with a tread member disposed on the outer periphery of a skeleton portion configured with springs. Thus, with the tire disclosed in Patent Literature 2, the above-described degradation of the driving performance can be suppressed.

[0011] However, from the viewpoint of improving the traction performance, the tire disclosed in Patent Literature 2 has room for further improvement.

[0012] An object of the present application is to provide a nonwoven body and a tire in which a tread member capable of improving the traction performance can be easily implemented.

[0013] MEANS FOR SOLVING THE PROBLEMS

[0014] The nonwoven body according to the first aspect of the application includes a plurality of metal fibers having a convex polygonal cross section orthogonal to the length direction.

[0015] Effects of the Invention

[0016] According to the present application, it is possible to provide a nonwoven body and a tire that can achieve a tread member capable of improving traction performance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is an appearance perspective view of a tire according to an embodiment of the present application.

[0018] Figure 2 is an appearance perspective view of a carcass portion of the tire of Figure 1

[0019] Figure 3 is an appearance perspective view of a rim member of the tire of Figure 2

[0020] is a schematic view showing an example of a main spring constituting the ground deforming portion of Figure 4 Figure 2 is a schematic view showing an example of a main spring being engaged with the rim member.

[0021] Figure 5 is a schematic view showing an example of a coupling method of the main spring being coupled to the rim member.

[0022] Figure 6 Figure 5 is an I-I sectional view of the tire of

[0023] Figure 7 is an II-II sectional view of the tire of Figure 5

[0024] is a schematic view showing an example of a coupling spring constituting the ground deforming portion of Figure 8 Figure 2 is a schematic view showing an example of a coupling method of the coupling spring being coupled to the main spring.

[0025] Figure 9A is a schematic view showing an example of a coupling method of the coupling spring being coupled to the main spring.

[0026] Figure 9B is a schematic view showing a modification example of the restriction portion.

[0027] Figure 10 is a schematic view showing a state in which the tread member is attached to the carcass portion.

[0028] Figure 11

[0029] Figure 12 ​​​​​is a view showing a state in which the tread member is partially attached to the skeleton portion.

[0030] Figure 13A is a schematic cross-sectional view showing a state in which the tread member is attached to the skeleton portion.

[0031] Figure 13B is a view showing a cross-sectional shape of a metal fiber of a nonwoven body according to an embodiment of the present application.

[0032] Figure 14 (a) to (c) of FIG. 1 are views showing the nonwoven body having different sizes of cross-sectional shapes of the metal fiber. Figure 14 (c) of FIG. 1 are views showing the nonwoven body having different sizes of cross-sectional shapes of the metal fiber. Further, Figure 14 (a) to (c) of FIG. 1 are views showing the nonwoven body having different sizes of cross-sectional shapes of the metal fiber. Figure 14 (c) of FIG. 1 are views showing the nonwoven body having different sizes of cross-sectional shapes of the metal fiber. Figure 13B is a conceptual view showing a state in which a ground surface of the tread member composed of the nonwoven body shown in FIG. 1 contacts with a running surface on which fine irregularities are formed.

[0033] Figure 15 is a view showing a modification example of the tread member.

[0034] Figure 16 is a view showing a modification example of the tread member. Figure 15

[0035] Figure 17 is a view showing a modification example of the tread member.

[0036] Figure 18A is a view showing a modification example of the tread member.

[0037] Figure 18B is a view showing a modification example of the tread member. Figure 18A

[0038] Figure 19A is a view showing a modification example of the tread member.

[0039] Figure 19B is a view showing a modification example of the tread member. Figure 19A

[0040] Figure 20 is a view showing an example of a manufacturing method of a metal fiber having a rectangular shape in cross-sectional shape.

[0041] Figure 21 is a schematic view showing a modification example of the main spring and the connecting spring.

[0042] Figure 22 is a view showing an example of the rim member provided with three rim portions.

[0043] Figure 23 (a) to​​​Figure 23 Fig. 2 is a view showing an example of the arrangement direction of the tread members of (c) respectively indicating different two tread portions.

[0044] Figure 24 Fig. 3 is a view showing an example of a tire provided with four rim portions and provided with different three tread portions. DETAILED DESCRIPTION

[0045] Hereinafter, an embodiment of the nonwoven body and the tire of the present application will be illustrated with reference to the drawings. The same reference numerals are assigned to common structures in each drawing. In the present specification, the tire width direction refers to a direction parallel to the rotation axis of the tire. The tire radial direction refers to a radial direction orthogonal to the rotation axis of the tire and centered on the rotation axis. The tire circumferential direction refers to a direction in which the tire rotates centered on the rotation axis of the tire. Figure 1 Fig. 1 is an appearance perspective view of a tire 1 of an embodiment of the present application. The tire 1 of the present embodiment includes a carcass portion 2 defining the configuration of the tire 1 and a tread member 300 mounted to the carcass portion 2.

[0046] < CARRASS PORTION 2 >

[0047] Figure 2 Fig. 2 is an appearance perspective view of the carcass portion 2 of the tire 1. As shown in Fig. 2, the carcass portion 2 of the tire 1 of the present embodiment includes a wheel portion 10 as a rim member and a ground deforming portion 20 capable of deforming in contact with the ground. Figure 2 Figure 3 Fig. 3 is an appearance perspective view of the wheel portion 10 of the carcass portion 2 of the tire 1. The wheel portion 10 is provided with a plurality of rim portions. As shown in Fig. 3 and Fig. 4, the wheel portion 10 of the present embodiment is provided with two rim portions. More specifically, the wheel portion 10 of the present embodiment includes a first rim portion 101 and a second rim portion 102. In addition, the wheel portion 10 of the present embodiment is further provided with a plurality of connecting portions 103 connecting the first rim portion 101 and the second rim portion 102. The number of the rim portions provided to the wheel portion 10 is not particularly limited. The wheel portion 10 may, for example, be provided with three or more rim portions. The wheel portion provided with three rim portions and the wheel portion provided with four rim portions will be described later (see Figure 2 Figure 3 Figures 22-24

[0048] ​​​​The first rim portion 101 and the second rim portion 102 are made of metal or resin. The first rim portion 101 and the second rim portion 102 are each formed in a circular ring shape. The first rim portion 101 and the second rim portion 102 are arranged at different positions in the tire width direction A with the same axis as the center axis. In the present embodiment, the first rim portion 101 and the second rim portion 102 are configured to be the same size and shape. However, the first rim portion 101 and the second rim portion 102 can also be configured to be different sizes or shapes as long as they function as the tire 1. The outer diameter of the first rim portion 101 and the second rim portion 102 can be appropriately determined according to the size of the tire 1 as needed.

[0049] The connecting portion 103 connects the first rim portion 101 and the second rim portion 102. The connecting portion 103 is made of metal or resin. As shown in Figure 3 , the wheel portion 10 of the present embodiment is provided with six connecting portions 103, but the number of connecting portions 103 provided in the wheel portion 10 is not limited thereto. The plurality of connecting portions 103 are each attached to one side of the circular ring-shaped first rim portion 101 and one side of the circular ring-shaped second rim portion 102. Thereby, the connecting portion 103 integrates the first rim portion 101 and the second rim portion 102. Hereinafter in the present specification, the side of the wheel portion 10 on which the connecting portion 103 is attached with respect to the first rim portion 101 and the second rim portion 102 is referred to as the "inner side in the tire width direction A", and the side on which the connecting portion 103 is not attached is referred to as the "outer side in the tire width direction A".

[0050] In the present embodiment, the first rim portion 101 and the second rim portion 102 are provided with an insertion receiving portion 105 (see Figure 6 ) on the side in the tire width direction A on which the main spring 201 of the ground deforming portion 20 is inserted. Details of the insertion receiving portion and details of the insertion form will be described later. In the present specification, "insertion" means fitting, and "locking" means fixing in the broad sense including the insertion form.

[0051] As shown in Figure 3 , the wheel portion 10 as the rim member of the present embodiment is further provided with a support member 104 that maintains the insertion state of the ground deforming portion 20 inserted into the insertion receiving portion 105 (see Figure 6 ). The support member 104 of the present embodiment is attached to the first rim portion 101 and the second rim portion 102. The support member 104 can be, for example, bolted to the inner side in the tire width direction A of the first rim portion 101 and the second rim portion 102.

[0052] The ground deforming portion 20 of the present embodiment is configured to be elastically deformable in the tire radial direction B. As shown in Figure 2As shown, the grounding deformation part 20 of this embodiment includes a main spring 201 and a connecting spring 211. The main spring 201 and the connecting spring 211 are made of metal.

[0053] Figure 4 It indicates composition Figure 2 A schematic diagram of an example of the main spring 201 of the ground deformation section 20 shown. The main spring 201 connects multiple rim portions. In this embodiment, the main spring 201 connects the first rim portion 101 and the second rim portion 102. Figure 22 This diagram shows the frame portion 2, which has three rim portions 501 to 503. (See diagram for example.) Figure 22 As shown, when the wheel part 10, which is the rim member of the frame part 2, has three rim parts 501 to 503, it is preferable that the main body spring 201 connects all groups of two adjacent rim parts among the three rim parts 501 to 503 in the same manner as connecting the first rim part 101 and the second rim part 102 described above. Figure 24 This diagram shows the skeleton part 2, which has four rim sections. While detailed structure is not shown, it is... Figure 24 In the example shown, it is also related to Figure 22 The same main spring 201 connects all groups of two adjacent rim portions among the four rim portions. However, in the frame portion 2 having three or more rim portions, it can also be configured to connect at least one group of any two rim portions.

[0054] like Figure 4 As shown, the main spring 201 includes an elastic deformation section 202 and a locking section 203. In this embodiment, the elastic deformation section 202 is composed of a helical spring. Here, a helical spring refers to a spring that elastically deforms according to a load and is wound in a coil (helical) shape around a predetermined axis. For the elastic deformation section 202, an elastic deformation section 202 with appropriate material and elasticity can be used according to the desired size and weight of the tire 1, the required nature of the ground contact deformation section 20, etc.

[0055] The locking portions 203 are provided at both ends of the elastically deformable portion 202. The locking portions 203 lock the main spring 201 to the wheel portion 10, which is a rim component. The locking portions 203 have a different shape from the elastically deformable portion 202. That is, in this embodiment, the locking portions 203 have a different shape than the coil shape.

[0056] In this embodiment, the locking part 203 is composed of a component integral with the elastically deformable part 202. For example... Figure 4 As shown, the locking part 203 of this embodiment is composed of an extension part, which is a portion formed by the material constituting the elastic deformation part 202 extending from both ends of the elastic deformation part 202.

[0057] As Figure 4 shown, the locking portion 203 of the present embodiment includes a straight portion 203a that is connected to both ends of the elastically deformable portion 202 and extends in a straight line. Further, as Figure 4 shown, the locking portion 203 of the present embodiment includes a curved portion 203b that is continuous with the leading end side of the straight portion 203a on the side opposite the base end side connected to the elastically deformable portion 202 and is curved with respect to the straight portion 203a. In the present embodiment, the curved portion 203b is curved in a manner orthogonal to the straight portion 203a in a side view of the main spring 201 (see Figure 4 ). In other words, the curved portion 203b of the present embodiment is curved in a manner orthogonal to the straight portion 203a in a plane that includes the axis of the main spring 201.

[0058] Here, the detailed contents of the state in which the main spring 201 is locked to the wheel portion 10 will be described with reference to Figures 5-7 . By fitting one of the locking portions 203 provided at both ends of the main spring 201 to the first rim portion 101 and the other locking portion 203 to the second rim portion 102, the main spring 201 is locked to the wheel portion 10, which is a rim member. Here, an example of the case in which one of the locking portions 203 is locked to the wheel portion 10 in a state of being fitted to the first rim portion 101 will be described, but the other locking portion 203 is locked to the wheel portion 10 in the same manner in a state of being fitted to the second rim portion 102.

[0059] Figure 5 is a schematic view showing an example of the state in which the main spring 201 is locked to the wheel portion 10, and is a schematic view of the state in which the main spring 201 is locked to the wheel portion 10 as viewed from the inner side in the tire width direction A of the first rim portion 101. Figure 5 Only a portion in which one of the locking portions 203 of the main spring 201 is locked is partially illustrated, but in fact, one of the locking portions 203 of the main spring 201 is locked as shown in Figure 5 over the entire circumference of the first rim portion 101.

[0060] Figure 6 is a cross-sectional view taken along line I-I of Figure 5 . Specifically, it is a cross-sectional view of the portion of the first rim portion 101 that includes the fitting receiving portion 105. As Figure 6As shown, in this embodiment, the main spring 201 is locked to the wheel portion 10 with the locking portion 203 engaged with the engagement receiving portion 105 provided on the inner side of the first rim portion 101 in the tire width direction A. In this embodiment, the engagement receiving portion 105 is configured as a hole into which the bent portion 203b of the locking portion 203 can be inserted. More specifically, the engagement receiving portion 105 in this embodiment is configured as a bottomed hole. The length (depth) of the hole in the extending direction of the engagement receiving portion 105 is preferably longer than the length of the bent portion 203b. As a result, the bent portion 203b can be inserted entirely into the engagement receiving portion 105, and the engagement state is easily stabilized. However, the engagement receiving portion 105 may also be configured as a through hole without a bottom.

[0061] The cross-sectional shape of the hole in the fitting bearing portion 105 is not limited as long as it allows the bending portion 203b to enter; for example, it can be oblong, elliptical, rectangular, polygonal, etc. In order to more reliably lock the elastic deformation portion 202, the shape and size of the cross-section of the hole are preferably approximately the same as the shape and size of the cross-section of the bending portion 203b.

[0062] like Figure 6 As shown, the main spring 201 is configured such that, with the bent portion 203b inserted into the fitting bearing portion 105, the elastic deformation portion 202 is located, except at least partially, on the outer side of the tire radial direction B of the annular first rim portion 101. Figure 6 and Figure 7 (The upper side). In this state, on the inner side of the tire width direction A of the first rim portion 101 ( Figure 6 and Figure 7 (On the left side), the support member 104 is installed on the first rim portion 101. For example... Figure 6 As shown, the support member 104 is installed in a position that presses against the bent portion 203b inserted into the hole of the fitting receiving portion 105, i.e., a position that prevents the bent portion 203b from disengaging from the hole of the fitting receiving portion 105. Preferably, the support member 104 is installed in a position that blocks the hole of the fitting receiving portion 105 when the main body spring 201 is not inserted. Furthermore, as... Figure 6As shown, the support member 104 sandwiches the straight portion 203a of the locking portion 203 between the surface on the inner side of the tire width direction A of the first rim portion 101 and the support member 104. In other words, the support member 104 is fixed to the first rim portion 101 in a manner of sandwiching the straight portion 203a of the locking portion 203 between the surface on the inner side of the tire width direction A of the first rim portion 101 and the support member 104. In this way, the main spring 201 of the present embodiment is locked to the wheel portion 10 in a manner that the straight portion 203a and the curved portion 203b of the locking portion 203 are sandwiched between the surface on the inner side of the tire width direction A of the first rim portion 101 and the support member 104 in a state that the curved portion 203b of the locking portion 203 is fitted to the fitting receiving portion 105. The support member 104 of the present embodiment is installed to the first rim portion 101 using the bolt 106, for example. Figure 7 Figure 5 is a II-II sectional view. More specifically, Figure 7 is a sectional view of a portion including the bolt 106 that fixes the support member 104 to the first rim portion 101. As shown, Figure 7 the support member 104 is fixed to the first rim portion 101 using the bolt 106. As shown, Figure 5 the support member 104 is fixed to the first rim portion 101 at a position between the two main springs 201. That is, in the first rim portion 101, the screw hole 107 for fixing the bolt 106 is formed at one between the two adjacent fitting receiving portions 105 in the tire circumferential direction C of the annular first rim portion 101. Thereby, the support member 104 can be fixed to the first rim portion 101 without interfering with the locking position of the main spring 201.

[0063] As shown, Figures 5-7 the bolt 106 is provided in a manner that the threaded end of the bolt 106 protrudes to the inner side of the tire width direction A than the surface on the inner side of the tire width direction A of the support member 104. It can be that the threaded end of the bolt 106 that protrudes to the inner side of the tire width direction A than the surface on the inner side of the tire width direction A of the support member 104 is used to fix the fixing portion of the tread member 300 described later.

[0064] The support member 104 can be configured as one annular member, or can be configured as a member that is divided into a plurality of members in its entirety in a circular ring shape. In this case, it can be that the plurality of support members 104 are arranged in a manner that the two support members 104 adjacent in the tire circumferential direction C contact or overlap each other at the end portion in the tire circumferential direction C. Further, it can be that the two support members 104 adjacent in the tire circumferential direction C are arranged in a manner that they are separated by an appropriate interval in the tire circumferential direction C. In the case that the support member 104 is configured as a member that is divided into a plurality of members, each member can be provided in a sector shape, for example. ​

[0065] The plurality of main springs 201 are arranged at predetermined intervals in the tire circumferential direction C over the entire region of the tire circumferential direction C. One of the plurality of main springs 201 described above is clamped to the wheel portion 10 by the clamping configuration described above using the fitting receiving portion 105 of the first rim portion 101. Also, the other of the main springs 201 is clamped to the wheel portion 10 by the clamping configuration described above using the fitting receiving portion 105 of the second rim portion 102 in the same manner. At this time, in the present embodiment, it can be that one of the main springs 201 has one clamping portion 203 and the other clamping portion 203 fitted to the fitting receiving portions 105 of the first rim portion 101 and the second rim portion 102 that are located on one straight line that is substantially parallel to the tire width direction A. That is, in the present embodiment, it can be that both of the clamping portions 203 of one of the main springs 201 are fixed to the same position in the tire circumferential direction C with respect to the first rim portion 101 and the second rim portion 102. However, it can also be that both of the clamping portions 203 of one of the main springs 201 are fixed to different positions in the tire circumferential direction C with respect to the first rim portion 101 and the second rim portion 102.

[0066] The number of main springs 201 fitted to the first rim portion 101 and the second rim portion 102 and the intervals in the tire circumferential direction C can be appropriately decided according to the size and weight of the tire 1, the properties of the ground deformation portion 20 required, and the like. The number of bolts 106 for mounting the support member 104 to the first rim portion 101 and the second rim portion 102 and the intervals in the tire circumferential direction C can also be appropriately decided. For example, the bolts 106 can not necessarily be one mounted between two adjacent fitting receiving portions 105 in the tire circumferential direction C as in the present embodiment. In the skeleton portion 2 of the tire 1 of the present embodiment, the ground deformation portion 20 is formed by the plurality of main springs 201 clamped to the wheel portion 10 being linked by the link spring 211. That is, in the present embodiment, the link spring 211 functions as a link member that links adjacent main springs 201. Figure 8 is a schematic view showing an example of the link spring 211 that constitutes the ground deformation portion 20. Figure 2 is a schematic view showing an example of the link spring 211 that constitutes the ground deformation portion 20. Figure 8As shown, the connecting spring 211 includes an elastic deformation portion 212 and a limiting portion 213. The connecting spring 211 is disposed between two main body springs 201 that are locked to the wheel portion 10 and are adjacent to each other in the tire circumferential direction C. Moreover, the connecting spring 211 is connected to the main body springs 201 by combining with the two main body springs 201. In this embodiment, the elastic deformation portion 212 is constituted by a coil spring. For the elastic deformation portion 212, an elastic deformation portion 212 with appropriate material and elasticity can be used according to the desired size and weight of the tire 1, the required nature of the ground contact deformation portion 20, etc. The diameter of the coil spring constituting the elastic deformation portion 212 is preferably close to the diameter of the coil spring constituting the elastic deformation portion 202 of the main body spring 201. Here, the diameter of the coil spring is the diameter of the circumscribed circle when the coil spring is viewed axially, and the same applies below. The closer the diameter of the helical spring constituting the elastic deformation section 212 is to the diameter of the helical spring constituting the main spring 201's elastic deformation section 202, the easier it is to apply force evenly when the helical springs constituting the elastic deformation section 202 and the elastic deformation section 212 are connected as described later to form the grounding deformation section 20. For example, the diameters of both the helical springs constituting the elastic deformation section 202 and the elastic deformation section 212 can be set to 15mm to 25mm, for example, 20mm.

[0067] In this embodiment, the limiting part 213 is provided at one end of the elastically deformable part 212. The other end of the elastically deformable part 212, where the limiting part 213 is not provided, does not constitute any other mechanism; therefore, the elastically deformable part 212 is shaped such that it is interrupted at the other end. The limiting part 213 limits the displacement of the connecting spring 211, which is connected to the main spring 201, relative to the main spring 201. The limiting part 213 only needs to limit the displacement of the connecting spring 211 relative to the main spring 201 in at least one direction. By using the limiting part 213 to limit the displacement of the connecting spring 211 relative to the main spring 201, as described later... Figure 9A and Figure 9B As explained, when the connecting spring 211 is connected to the main spring 201, the connection position of the connecting spring 211 is positioned and fixed. That is, the connection state of the connecting spring 211 relative to the main spring 201 is positioned and fixed. The limiting part 213 has a different shape than the elastically deformable part 212. That is, in this embodiment, the limiting part 213 has a different shape than the coil shape.

[0068] In this embodiment, the limiting part 213 is composed of a component integral with the elastically deformable part 212. For example... Figure 8 As shown, the limiting portion 213 in this embodiment is an extension portion formed by a portion of the material constituting the elastically deformable portion 212 extending from one end of the elastically deformable portion 212. Figure 8In the illustrated example, the restriction portion 213 has a wheel-shaped portion formed by bending the wire forming the elastic deformation portion 212 into a wheel shape. The wheel shape is formed so that a direction intersecting the central axis direction D parallel to the central axis O of the elastic deformation portion 212 becomes a central axis direction E. The wheel-shaped portion of the restriction portion 213 can be any size that can restrict displacement of the connecting spring 211. For example, the wheel-shaped portion of the restriction portion 213 can be configured to have a diameter of 0.5 to 1.0 times the diameter of the elastic deformation portion 212.

[0069] Here, the function of the restriction portion 213 is described in conjunction with the method of connecting the connecting spring 211 to the main spring 201. Figure 9A and Figure 9B is a schematic diagram for explaining an example of the method of connecting the connecting spring 211 to the main spring 201.

[0070] As Figure 9A illustrated, the connecting spring 211 is connected to the two adjacent main springs 201 by hooking the elastic deformation portion 212 thereof to the elastic deformation portion 202 of the main spring 201 clamped by the wheel portion 10, and combining the connecting spring 211 with the two adjacent main springs 201. Specifically, the connecting spring 211 is connected to the main spring 201 in a manner that restricts relative displacement between the two adjacent main springs 201 in the tire circumferential direction C. At this time, the connecting spring 211 gradually combines with the two adjacent main springs 201 by inserting the other end side, on which the restriction portion 213 is not provided, into the main spring 201 while rotating and advancing.

[0071] When the entire elastic deformation portion 212 of the connecting spring 211 is combined with the main spring 201, it eventually becomes the state in which the restriction portion 213 is in contact with the main spring 201, as Figure 9B illustrated. The restriction portion 213 cannot be combined with the main spring 201 due to its shape. Therefore, the connecting spring 211 does not move further to the insertion direction side than the position at which the restriction portion 213 is in contact with the main spring 201. In particular, after the wheel-shaped portion of the restriction portion 213 is in contact with the main spring 201, the connecting spring 211 does not advance (move to the insertion direction side) even if it attempts to rotate and advance. In this way, the restriction portion 213 restricts displacement of the connecting spring 211 in at least one direction with respect to the main spring 201. In this way, the connecting state of the connecting spring 211 to the main spring 201 is positioned and fixed by the restriction portion 213. Furthermore, the connecting spring 211 connected to the main spring 201 is less likely to be detached from the main spring 201.

[0072] Further, it is preferable that at least one of the both ends of the link spring 211 is not fixed to the wheel portion 10. In the present embodiment, neither of the both ends of the link spring 211 is fixed to the wheel portion 10. That is, in the present embodiment, neither of the both ends of the link spring 211 is fixed. However, it is also possible that only one of the both ends of the link spring 211 is fixed to the wheel portion 10. In this case, the other end of the both ends of the link spring 211, which is opposite to the one end to which the restriction portion 213 is provided, is fixed to the rim member.

[0073] In the present embodiment, all of the main springs 201 which are latched to the wheel portion 10 are linked with the adjacent two main springs 201 respectively by the link spring 211. In the present embodiment, the skeleton portion 2 is configured in this way. That is, in the present embodiment, all of the main springs 201 of the ground deformation portion 20 of the skeleton portion 2 are linked with the two link springs 211, and all of the link springs 211 of the ground deformation portion 20 of the skeleton portion 2 are linked with the two main springs 201. By linking the link spring 211 between the adjacent two main springs 201 in this way, even if a load is applied to the skeleton portion 2, the distance between the main springs 201 is not excessively expanded, and it is easy to maintain the function as the tire 1.

[0074] Further, the link spring 211 which links the two main springs 201 can be inserted from the first rim portion 101 side toward the second rim portion 102 side in the tire width direction A, or can be inserted from the second rim portion 102 side toward the first rim portion 101 side in the tire width direction A. It is preferable that half the number of the link springs 211 provided in the skeleton portion 2 are inserted from the first rim portion 101 side toward the second rim portion 102 side in the tire width direction A, and the other half are inserted from the second rim portion 102 side toward the first rim portion 101 side in the tire width direction A. By this, the restriction portions 213 of the link springs 211 are equally arranged on both sides of the skeleton portion 2 in the tire width direction A, and it is easy to obtain the balance of the skeleton portion 2. Further, it is possible to prevent the restriction portions 213 from being concentrated on one side of the skeleton portion 2 in the tire width direction A. It is particularly preferable that the two link springs 211 adjacent to each other in the tire circumferential direction C among the plurality of link springs 211 are inserted from different directions from each other. By this, it is more easy to obtain the balance of the skeleton portion 2.

[0075] Further, the skeleton portion 2 can also include a connecting member that connects the wheel-shaped portions of the plurality of the linking springs 211 to each other. The connecting member can be composed of, for example, a wire. The plurality of the linking springs 211 are provided, for example, such that one half of the linking springs 211 are inserted from the first bead portion 101 side toward the second bead portion 102 side, and the other half of the linking springs 211 are inserted from the second bead portion 102 side toward the first bead portion 101 side. In this case, the linking springs 211 whose restriction portions 213 are located on the first bead portion 101 side in the tire width direction A are inserted from the first bead portion 101 side toward the second bead portion 102 side, and the linking springs 211 whose restriction portions 213 are located on the second bead portion 102 side in the tire width direction A are inserted from the second bead portion 102 side toward the first bead portion 101 side. In this case, the skeleton portion 2 can have two wires, one wire connecting the wheel-shaped portions of the plurality of the restriction portions 213 located on the first bead portion 101 side in the tire width direction A, and the other wire connecting the wheel-shaped portions of the plurality of the restriction portions 213 located on the second bead portion 102 side in the tire width direction A.

[0076] The wire connecting the wheel-shaped portions of the plurality of the restriction portions 213 located on the first bead portion 101 side is provided, for example, so as to pass through the central opening portions of all the wheel-shaped portions of the plurality of the restriction portions 213 located on the first bead portion 101 side along the tire circumferential direction C. Similarly, the wire connecting the wheel-shaped portions of the plurality of the restriction portions 213 located on the second bead portion 102 side is provided, for example, so as to pass through the central opening portions of all the wheel-shaped portions of the plurality of the restriction portions 213 located on the second bead portion 102 side along the tire circumferential direction C. By providing such a wire, the restriction portions 213 of the plurality of the linking springs 211 can be connected to each other. Therefore, the wire restricts the displacement of the relative positional relationship between the restriction portions 213. As a result, the linking springs 211 combined with the main springs 201 are less likely to be separated from the main springs 201.

[0077] However, the connecting member connecting the wheel-shaped portions of the plurality of the restriction portions 213 of the linking springs 211 can not necessarily be composed of the central opening portions of the wheel-shaped portions of the plurality of the restriction portions 213 as described above, but can be composed of any form that connects the restriction portions 213 to each other. In this case, for example, the connecting member can connect the wheel-shaped portions of the plurality of the restriction portions 213 by being fixed to the wheel-shaped portions of the plurality of the restriction portions 213 to be connected, respectively. By providing at least the wire connecting the restriction portions 213 of the plurality of the linking springs 211, the displacement of the relative positional relationship between the linking springs 211 connected by the wire is restricted.

[0078] In addition, in the above-described embodiment, the portion of the wheel shape of the restriction portion 213 is described as having a center axis direction E intersecting a center axis direction D parallel to the center axis O of the elastic deformation portion 212, but the shape of the restriction portion 213 is not limited thereto. The restriction portion 213 can be any structure capable of restricting displacement of the link spring 211 in at least one direction with respect to the main spring 201.

[0079] Further, in the present embodiment, the restriction portion 213 is composed of a member integral with the elastic deformation portion 212, but the restriction portion 213 can also be composed of a member that is not integral with the elastic deformation portion 212. For example, as shown in Figure 10 schematically shown in FIG. 10, the displacement of the link spring 211 with respect to the main spring 201 is restricted by a restriction portion 213 composed of a separate member independent of the link spring 211. In Figure 10 the example shown in FIG. 11, the restriction portion 213 is composed of a separate member independent of the link spring 211 that restricts displacement of the contact portion of the main spring 201 and the link spring 211 combined with each other.

[0080] The length of the link spring 211 can be appropriately determined in accordance with the desired size and weight of the tire 1, the required properties of the ground deformation portion 20, and the like. The link spring 211 is preferably composed so that the length of the elastic deformation portion 212 is shorter than the length of the elastic deformation portion 202 of the main spring 201. The link spring 211 preferably has a length such that the elastic deformation portion 212 extends over the entire range in the tire width direction A. By this, the region of the elastic deformation portion 202 of the main spring 201 that is at least in contact with the ground in the tire width direction A is linked to the elastic deformation portion 212 of the link spring 211.

[0081] <Tread Member 300>

[0082] As shown in Figure 1 , the tire 1 includes a tread member 300 disposed on the outer periphery of the above-described carcass portion 2. Figure 11 and Figure 12 are views showing a state in which the tread member 300 is attached to the carcass portion 2 in a partial region. More specifically, Figure 11 is a view of the carcass portion 2 in which the tread member 300 is attached in a partial region, as viewed from the outside in the tire radial direction B. Figure 12 is a view showing a portion of the carcass portion 2 in which the tread member 300 is attached in a partial region, enlarged.

[0083] As shown in Figure 1 , Figure 11 and Figure 12As shown, the tread member 300 is mounted at least to the ground contact region of the ground deforming portion 20 of the skeleton portion 2 including the main springs 201 and the link springs 211. More specifically, the tread member 300 is mounted to the skeleton portion 2 in a manner to cover at least a portion of the outer side of the ground deforming portion 20 of the skeleton portion 2 in the tire radial direction B. More preferably, as in the present embodiment, the tread member 300 is mounted to the skeleton portion 2 in a manner to cover the entire region of the outer side of the ground deforming portion 20 of the skeleton portion 2 in the tire radial direction B over the entire region in the tire width direction A of the ground deforming portion 20. Further preferably, as in the present embodiment, the tread member 300 is mounted to the skeleton portion 2 in a manner to cover the entire region of the outer side of the ground deforming portion 20 of the skeleton portion 2 in the tire radial direction B over the entire region in the tire circumferential direction C. Particularly preferably, as in the present embodiment, the tread member 300 is mounted to cover the entire region of the outer side of the ground deforming portion 20 of the skeleton portion 2 in the tire radial direction B over the entire region of the outer sides of the main springs 201 and the link springs 211 in the tire width direction A and the entire region of the outer side of the ground deforming portion 20 of the skeleton portion 2 in the tire radial direction B between the first rim portion 101 and the second rim portion 102 in the tire circumferential direction C, so that the main springs 201 and the link springs 211 are not exposed to the outside.

[0084] As shown in Figure 11 and Figure 12 , the outer side surface of the skeleton portion 2 in the tire radial direction B is formed by the main springs 201 and the link springs 211 combined with each other. The groove 230 is formed in the outer side surface of the skeleton portion 2 in the tire radial direction B using the main springs 201 and the link springs 211 combined with each other.

[0085] As described above, the position at which the main spring 201 of the present embodiment is caught on the tire circumferential direction C at both end portions of the wheel portion 10 is the same position. That is, in a tire side view of the tire 1 viewed along the rotation axis, the plurality of main springs 201 forming the ground deforming portion 20 of the present embodiment has a meridian configuration extending radially from the rotation axis of the tire 1. Therefore, in the tire side view, the link springs 211 woven together with the main springs 201 also have a meridian configuration extending radially from the rotation axis of the tire 1. In the case where the main springs 201 and the link springs 211 are thus provided in the meridian configuration extending radially in the tire side view, as shown in Figure 11 and Figure 12 , the groove 230 is formed in a manner to extend in a direction intersecting the tire width direction A and the tire circumferential direction C. Hereinafter, the direction in which the groove 230 extends will be referred to as the "extension direction F" (see Figure 11 ). In the present embodiment, the pitch of the coil spring of the elastic deforming portion 202 of the main spring 201 is substantially equal to the pitch of the coil spring of the elastic deforming portion 212 of the link spring 211.

[0086] As shown in Figure 11 andFigure 12 As shown, in the present embodiment, the tread member 300 is installed in the groove 230 formed with the main spring 201 and the link spring 211. Figure 13A is a schematic cross-sectional view that shows a cross section of the tread member 300 installed in the groove 230, which is orthogonal to the extending direction F of the groove 230. As shown in Figure 13A As shown, the tread member 300 is installed in such a manner that at least a part thereof is buried in the groove 230. By installing the tread member 300 in such a manner that at least a part thereof is buried in the groove 230, the tread member 300 is less likely to fall out of the groove 230. In the present embodiment, the tread member 300 is installed in such a manner that only a part thereof, i.e., only a part of the tread member 300 that is inside in the tire radial direction B (in Figure 13A , a lower part) is buried in the groove 230, and a part of the tread member 300 that is outside in the tire radial direction B (in Figure 13A , an upper part) is exposed from the groove 230. In this case, vibration and the like during running can be suppressed. However, the tread member 300 can also be installed in such a manner that the entire tread member 300 is buried in the groove 230. In this case, the tread member 300 is less likely to fall out of the groove 230. In the present embodiment, as shown in Figure 1 , the tread member 300 is buried in all of the grooves 230 formed in the skeleton portion 2. The tread member 300 of the present embodiment is arranged in such a manner that the tread member 300 adjacent in the tire circumferential direction C is in contact with each other. However, the tread member 300 can also not be buried in all of the grooves 230. For example, the tread member 300 can be buried in only a part of the grooves 230 formed in the skeleton portion 2.

[0087] In the present embodiment, it is preferable that the tread member 300 be installed in the skeleton portion 2 in a detachable manner. By installing the tread member 300 in the skeleton portion 2 in a detachable manner, the tread member 300 can be detached from the skeleton portion 2 and replaced when the tread member 300 is worn, or the like.

[0088] As shown in Figure 13A , the tread member 300 includes a nonwoven body 302. More specifically, Figure 13A The tread member 300 of the present embodiment shown in

[0089] Figure 13B is a view showing an outline of a cross section of the plurality of metal fibers 302a that constitute the nonwoven body 302, which is orthogonal to the length direction (hereinafter, only referred to as "cross-sectional outline"). As shown in Figure 13BAs shown, the nonwoven body 302 contains a plurality of metal fibers 302a having a rectangular shape in cross-sectional profile. More specifically, the fibers constituting the nonwoven body 302 of the present embodiment are only a plurality of metal fibers 302a having a rectangular shape in cross-sectional profile. In addition, "rectangular" means a quadrangle (square or rectangle) in which all angles are right angles.

[0090] The metal fiber 302a of the present embodiment has a rectangular shape in cross-sectional profile, but the cross-sectional profile of the metal fiber 302a is not limited to a rectangular shape. The cross-sectional profile of the metal fiber 302a can be various convex polygonal shapes such as a triangular shape, a parallelogram shape including a rhombic shape, a regular pentagonal shape, and the like. "Convex polygon" means a simple polygon that does not have self-crossings, and a line segment connecting any two points inside or on the boundary thereof does not exist outside the polygon. For example, as shown in FIG. 2, a hexagonal shape in cross-sectional profile is a convex polygon, but a star polygon shape is not a convex polygon. Figure 13B As shown, if the metal fiber 302a is used to constitute the ground-contact surface 300b (the surface on the upper side in FIG. 1) of the tread member 300, a fine concavo-convex can be formed on the ground-contact surface 300b of the tread member 300. Figure 13B As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 13B As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14 As shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, the ground-contact surface 300b of the tread member 300 is in contact with a running surface on which a fine concavo-convex is formed. Figure 14(c) indicates that the fine irregularities formed on the ground-contact surface 300b of the tread member 300 are easily engaged with the fine irregularities of the traveling surface Y. Therefore, by providing the ground-contact surface 300b of the tread member 300 with the fine irregularities formed by the metal fibers 302a, it is possible to achieve high traction performance when traveling on the traveling surface Y provided with the fine irregularities. In addition, in the case where the traveling surface Y is assumed to be entirely paved with the angular particles X having the average particle diameter a, the length of each side in the cross section (hereinafter referred to as "cross-sectional side length") β of the metal fiber 302a having a square cross-sectional shape preferably satisfies the following (Equation 1). In addition, Figure 14 (a) indicates a state of "β = V2a". Figure 14 (b) indicates a state of "β = V2a / 2". Figure 14 (c) indicates a state of "β = V2a / 4". By providing the cross-sectional side length β of the metal fiber 302a to be V2a / 4 or more, it is possible to easily achieve the metal fiber 302a having strength that is not easily broken or fractured when traveling on the traveling surface Y. In addition, by providing the cross-sectional side length β of the metal fiber 302a to be V2a or less, it is possible to easily achieve the irregularities of the ground-contact surface 300b that are easily engaged with the irregularities of the traveling surface Y. V2a / 4 ≤ β ≤ V2a ···· (Equation 1)

[0091] In addition, as an example, in the case where the nonwoven body 302 of the present embodiment is used as the tread member 300 of a lunar rover, since the average particle diameter of the regolith is about 70 μm, based on the above (Equation 1), the cross-sectional side length β of the metal fiber 302a is preferably 24.7 μm ≤ β ≤ 98.9 μm.

[0092] In addition, in the case where the traveling surface Y is assumed to be entirely paved with the angular particles X having the average particle diameter a, the fiber conversion diameter γ of the metal fiber 302a having a convex polygonal cross-sectional shape preferably satisfies the following (Equation 2). In addition, the fiber conversion diameter γ refers to the diameter of a circle when the cross-sectional area of the metal fiber 302a having a convex polygonal cross-sectional shape is converted into a circular area. In addition, Figure 14 (a) indicates a state where the fiber conversion diameter γ of the metal fiber 302a is close to "2a". Figure 14 (b) indicates a state where the fiber conversion diameter γ of the metal fiber 302a is close to "a". Figure 11(c) indicates a state in which the fiber-equivalent diameter γ of the metal fiber 302a is close to "α / 2". By setting the fiber-equivalent diameter γ of the metal fiber 302a to be α / 2 or more, it is easy to realize the strength of the metal fiber 302a that is not easily broken or fractured when running on the running surface Y. Further, by setting the fiber-equivalent diameter γ of the metal fiber 302a to be 2α or less, it is easy to realize the concavo-convex of the ground contact surface 300b that is easily engaged with the concavo-convex of the running surface Y. α / 2 ≤ γ ≤ 2α ··· (Equation 2)

[0093] Further, as an example, in a case where the nonwoven body 302 of the present embodiment is used as the tread member 300 of a lunar rover, since the average particle diameter of the regolith is about 70 μm, based on the above (Equation 2), the fiber-equivalent diameter γ of the metal fiber 302a is preferably 35 μm ≤ γ ≤ 140 μm.

[0094] By thus constituting the ground contact surface 300b of the tread member 300 from a plurality of metal fibers 302a having a convex polygonal shape in cross-sectional profile, it is possible to improve the traction performance when running on a running surface having fine concavo-convex.

[0095] As described above, the tread member 300 of the present embodiment is constituted from the nonwoven body 302 including a plurality of metal fibers 302a having a rectangular shape in cross-sectional profile. Therefore, by constituting the ground contact surface 300b of the tread member 300 from a portion including the metal fiber 302a having a rectangular shape in cross-sectional profile, it is possible to obtain the above-described traction performance. More specifically, as described above, the fibers constituting the nonwoven body 302 of the present embodiment are only the metal fiber 302a having a rectangular shape in cross-sectional profile. Therefore, it is sufficient that the ground contact surface 300b of the tread member 300 is constituted from an arbitrary portion of the nonwoven body 302.

[0096] Further, the fibers constituting the nonwoven body 302 can include fibers having a cross-sectional profile that is not a convex polygonal shape. However, the proportion of the number of the metal fiber 302a having a convex polygonal shape in cross-sectional profile in the total number of fibers constituting the nonwoven body 302 is preferably 70% or more, more preferably 80% or more, further preferably 90% or more, and most preferably 100% as in the present embodiment.

[0097] The metal fiber 302a is preferably made of austenitic stainless steel or aluminum alloy. Furthermore, the fibers constituting the nonwoven fabric 302 are preferably made of metal, regardless of their cross-sectional shape, and particularly preferably of austenitic stainless steel or aluminum alloy. By making all the fibers constituting the nonwoven fabric 302 of austenitic stainless steel or aluminum alloy, a structure that is not easily damaged even in extremely low-temperature environments can be achieved. In other words, using such a nonwoven fabric 302 enables the tread component 300 to achieve durability in extremely low-temperature environments. In particular, if the fibers constituting the nonwoven fabric 302 are made of aluminum alloy, not only is the aforementioned durability easily ensured, but lightweighting is also easily achieved.

[0098] like Figure 12 , Figure 14 As shown, the tread member 300 of this embodiment is configured as a rod and can be embedded along the groove 230. Alternatively, a through hole extending along the extension direction may be provided in the central portion of the rod-shaped tread member 300 of this embodiment.

[0099] Furthermore, preferably, more than 50% of the fibers constituting the nonwoven fabric 302 extend in substantially the same direction. This arrangement facilitates the formation of a substantially uniformly textured contact surface 300b (see reference 302a) using multiple metal fibers 302a. Figure 14 (a)~ Figure 13A (c)). By setting it in this way, more stable traction performance can be obtained. Furthermore, more preferably, more than 80% of the fibers constituting the nonwoven fabric 302 extend in approximately the same direction. By setting it in this way, a more uniformly textured contact surface 300b can be formed. Hereinafter, for ease of explanation, the aforementioned "approximately the same direction" in which more than 50% of the fibers constituting the nonwoven fabric 302 extend will be referred to as the "main fiber direction".

[0100] Here, as described above, the tread member 300 of this embodiment is configured as a rod. That is, the nonwoven fabric 302 constituting the tread member 300 of this embodiment is configured as a rod. In this embodiment, the main fiber direction is the direction along the length of the entire rod-shaped nonwoven fabric 302. By setting it in this way, the cross-sectional shape and cross-sectional size of the metal fibers 302a can be appropriately set, thereby making it easy to control the size of the recess formed between two adjacent metal fibers 302a to the desired size. Therefore, it is easy to achieve a size of concavity and convexity corresponding to the concavity and convexity of the road surface on the contact surface 300b of the tread member 300.

[0101] like Figure 19AAs shown, the cross-sectional shape of the rod-shaped nonwoven body 302 constituting the tread member 300 of the present embodiment in a direction orthogonal to the length direction is an oval shape, but is not limited to this shape. The cross-sectional shape of the rod-shaped nonwoven body 302 in a direction orthogonal to the length direction can be, for example, a circular shape, a gourd shape (see FIG. 6), or the like. Figure 19B , Figure 13A ) and the like.

[0102] In addition, the tread member 300 is not limited to the example shown in FIG. 1. Figure 15 Figure 15 is a view showing a modification of the tread member 300. Figure 13A The tread member 300 shown in FIG. 2 is also composed of the nonwoven body 302 as in the example shown in FIG. 1. Figure 15 The nonwoven body 302 shown in FIG. 3 is also composed of a plurality of metal fibers 302a having a rectangular cross-sectional shape. However, the nonwoven body 302 constituting the tread member 300 shown in FIG. 3 is not a mass of the metal fibers 302a entangled with each other, but is a sheet-shaped nonwoven fabric. As shown in FIG. 4, the sheet-shaped nonwoven fabric is wound in a rod-shaped form and is at least partially embedded in the groove 230 (see FIG. 5, Figure 15 Figure 15 Figure 9A Figure 9A and the like) and the link spring 211 (see FIG. 5, and the like). By being configured in this way, the rod-shaped nonwoven body 302 of the tread member 300 can be easily realized. Figure 11 Figure 12 Figure 15 In addition, as shown in FIG. 5, it is preferable that the sheet-shaped nonwoven fabric serving as the nonwoven body 302 be wound in a manner that a plurality of layers are stacked in the radial direction. By being configured in this way, even if the outermost layer in the radial direction is worn or is missing during travel, other layers of the same structure will appear on the inside in the radial direction, and thus a decrease in the performance of the tread member 300 is less likely to occur. Therefore, a decrease in the performance of the tread member 300 due to wear, missing, or the like can be suppressed, and the distance that can be traveled can be extended.

[0103] In addition, as shown in FIG. 5, it is preferable that the sheet-shaped nonwoven fabric serving as the nonwoven body 302 be wound in a manner that a plurality of layers are stacked in the radial direction. By being configured in this way, even if the outermost layer in the radial direction is worn or is missing during travel, other layers of the same structure will appear on the inside in the radial direction, and thus a decrease in the performance of the tread member 300 is less likely to occur. Therefore, a decrease in the performance of the tread member 300 due to wear, missing, or the like can be suppressed, and the distance that can be traveled can be extended. Figure 16

[0104] In addition, it is preferable that the nonwoven fabric constituting the nonwoven body 302 be formed by needle punching. Needle punching refers to a method in which a plurality of (for example, several thousand) needles are simultaneously moved up and down to pierce a web-shaped material in which fibers are made into a sheet shape and the fibers are entangled with each other to form a nonwoven fabric. That is, the nonwoven fabric constituting the nonwoven body 302 is preferably a structure in which fibers are integrated with each other by mechanical entanglement. By being configured in this way, a nonwoven body 302 having durability that is less likely to be damaged even in an environment in which temperature changes greatly, an environment in which cosmic ray radiation is high, such as the surface of the moon, or the like can be realized. In addition, it is preferable that the nonwoven fabric constituting the nonwoven body 302 not be bonded by an adhesive or fusion. ​​​​​​​

[0105] Further, as described above, the main fiber direction of the fibers constituting the nonwoven body 302 is preferably a direction along the length direction of the entire rod-shaped nonwoven body 302. Therefore, in the case where the rod-shaped nonwoven body 302 is formed by winding up the sheet-shaped nonwoven fabric, it is preferable that, as shown in FIG. 6, the winding direction (winding-up direction) of the sheet-shaped nonwoven fabric be set to a direction orthogonal to the main fiber direction. Figure 17 Further, as described above, the main fiber direction of the fibers constituting the nonwoven body 302 is preferably a direction along the length direction of the entire rod-shaped nonwoven body 302. Therefore, in the case where the rod-shaped nonwoven body 302 is formed by winding up the sheet-shaped nonwoven fabric, it is preferable that, as shown in FIG. 6, the winding direction (winding-up direction) of the sheet-shaped nonwoven fabric be set to a direction orthogonal to the main fiber direction.

[0106] Figure 17 FIG. 7 is a view showing a modification example of the tread member 300. Figure 15 The tread member 300 shown in FIG. 7 also contains the sheet-shaped nonwoven fabric as the nonwoven body 302 as in the example shown in FIG. 6. However, the sheet-shaped nonwoven fabric is wound around the rod-shaped core member 301. Figure 17 The tread member 300 shown in FIG. 7 also contains the sheet-shaped nonwoven fabric as the nonwoven body 302 as in the example shown in FIG. 6. However, the sheet-shaped nonwoven fabric is wound around the rod-shaped core member 301. Figure 15 The tread member 300 shown in FIG. 7 also contains the sheet-shaped nonwoven fabric as the nonwoven body 302 as in the example shown in FIG. 6. However, the sheet-shaped nonwoven fabric is wound around the rod-shaped core member 301. Figure 18A The tread member 300 shown in FIG. 7 also contains the sheet-shaped nonwoven fabric as the nonwoven body 302 as in the example shown in FIG. 6. However, the sheet-shaped nonwoven fabric is wound around the rod-shaped core member 301.

[0107] Figure 18B Figure 18A FIG. 7 is a view showing a modification example of the tread member 300. Figure 18B Figure 19A The tread member 300 shown in FIG. 7 includes the sheet-shaped nonwoven fabric as the nonwoven body 302, the rod-shaped core member 301, and the reinforcing member 303 present between the core member 301 and the nonwoven fabric on the radially outer side of the core member 301. The reinforcing member 303 can be provided in a cylindrical shape surrounding the radially outer side of the core member 301. The reinforcing member 303 can be constituted by a spiral spring with a relatively dense pitch, for example. The core member 301 is disposed inside the cylindrical reinforcing member 303. By providing the reinforcing member 303, the core member 301 can be inhibited from intruding into the nonwoven fabric as the nonwoven body 302 as compared to the case where the reinforcing member 303 is not provided. Further, the core member 301 is protected by the reinforcing member 303, and thus the durability of the tread member 300 is improved. Further, the reinforcing member 303 accumulates and holds heat conducted from the wheel portion 10 or the like and heat emitted from the tread member 300, and thus excessive cooling of the tread member 300 in an extremely low temperature environment can be inhibited.

[0108] Figure 19B Figure 19A FIG. 7 is a view showing a modification example of the tread member 300. Figure 19B Figure 18A The tread member 300 shown in FIG. 7 also contains the sheet-shaped nonwoven fabric as the nonwoven body 302 as in the example shown in FIG. 6. However, the sheet-shaped nonwoven fabric is wound around the rod-shaped core member 301. Figure 18B Figure 19A The structure shown in FIG. 7 is different from the structure shown in FIG. 6 only in the cross-sectional shape of the nonwoven fabric as the nonwoven body 302 after being embedded in the groove 230. Figure 19B Figure 19A ​​​​​​As shown, the nonwoven body 302 of the tread member 300 can also have a gourd shape in cross section. In this case, the tread member 300 has a fixed region al embedded in the groove 230 and a ground contact region a2. The ground contact region a2 is provided on the radially outer side of the tire 1 with respect to the fixed region al. The fixed region al in the tread member 300 is provided with the core material 301 and the reinforcing member 303. As shown in Figure 19B , Figure 17 As shown in a cross section orthogonal to the length direction of the rod-shaped tread member 300, the width of the ground contact region a2 is greater than the width of the fixed region al. Further, the length of the tire radial direction B of the ground contact region a2 is longer than the length of the tire radial direction B of the fixed region al.

[0109] In the present embodiment, the fixing method of the rod-shaped tread member 300 to the skeleton portion 2 is not particularly limited. The tread member 300 can also include a fixing portion for fixing to the skeleton portion 2, for example. The fixing portion can be constituted by a portion extending from both ends of the above-described core material 301 (refer to Figure 7 , for example. The fixing portion can be fixed to the protruding threaded end of the above-described bolt 106 (refer to Figure 20 ), for example. By providing such a fixing portion, the tread member 300 is less likely to fall off from the skeleton portion 2.

[0110] Next, the manufacturing method of the above-described metal fiber 302a having a rectangular cross-sectional shape will be described with reference to Figure 20 As shown in Figure 20 , a coil 401 of the metal thin film 400 is formed by coiling the metal thin film 400, and the end surface of the coil 401 is cut by a cutting tool 600, thereby obtaining the metal fiber 302a having a rectangular cross-sectional shape. However, the manufacturing method shown in Figure 21 is an example, and the manufacturing method of the metal fiber having a convex polygonal cross-sectional shape is not particularly limited.

[0111] As described above, by using the nonwoven body 302 including a plurality of metal fibers 302a having a rectangular cross-sectional shape as described in the present embodiment, the tread member 300 capable of improving the traction performance can be realized. The cross-sectional shape of the metal fiber 302a is not limited to a rectangular shape, and the tread member 300 capable of improving the traction performance can be realized even if it is another convex polygonal shape. Further, the use of the nonwoven body 302 can not be the tread member 300 of the tire 1.

[0112] The nonwoven body and the tire of the present application are not limited to the specific structures shown in the above-described embodiments, and various modifications, alterations, combinations can be made without departing from the scope of the claims. For example, in the above-described embodiments, the elastic deformation portions 202 of the main body spring 201 and the elastic deformation portions 212 of the connecting spring 211 are each composed of a coil spring, but are not limited to this structure. The elastic deformation portions 202 of the main body spring 201 and / or the elastic deformation portions 212 of the connecting spring 211 can also be composed of, for example Figure 21 a two-dimensional (i.e., extending substantially along the same plane) wave-shaped metal wire portion as shown. Figure 11 The example shown is an example in which the elastic deformation portion 202 and the elastic deformation portion 212 are formed in a two-dimensional wave shape. The wave-shaped metal wire portion can be, for example, a shape in which semicircles are connected, or a sine wave shape. In this case as well, the main body spring 201 and the connecting spring 211 can be connected by combining the wave-shaped metal wire portion of the main body spring 201 and the wave-shaped metal wire portion of the connecting spring 211. In other words, the main body spring 201 and the connecting spring 211 can also be structures that do not form the groove 230 (see FIG. 2) when combined with each other. Figures 22-24 Thus, the tread member 300 is not limited to a structure held in the groove 230. However, from the viewpoint of stabilizing the tread member 300, it is preferable to provide the main body spring 201 and the connecting spring 211 shown in the above-described embodiments, which divide the groove 230 when combined with each other.

[0113] Further, in the above-described embodiments, a tire 1 provided with a plurality of tread members 300 arranged without gaps in the tire circumferential direction C between two rim portions was described, but is not limited to this structure. For example, as shown in Figure 23 is a wheel portion 10 provided with three or more rim portions. Also, as shown in Figure 24 , Figure 23 is a structure in which a plurality of (two in Figure 24 , three in Figure 23 ) tread portions are provided at different positions in the tire width direction A.

[0114] Figure 23 (a) to Figure 23 (c) of FIG. 10 each show a tire 1 provided with two tread portions 4a, 4b at different positions in the tire width direction A. Figure 23 (a) to Figure 23 (c) of FIG. 10 differ in that the arrangement direction of the tread members 300 of the tread portions 4a, 4b of the tire 1 is different. As shown in Figure 23 (a) to Figure 23The arrangement direction of the rod-shaped tread member 300 is not particularly limited as shown in (c). In addition, even if there is only one tread portion as in the above-described embodiment, the arrangement direction of the tread member 300 is not particularly limited. It is also possible to arrange the tread members 300 in the tire width direction A as shown in (a) or in the tire circumferential direction C as shown in (b). Figure 23 (a) of (b) of Figure 24 (b) of (c) of ​ (c) of (c) of ​ (c) of (c) of

[0115] Industrial applicability

[0116] The present application relates to a nonwoven body and a tire.

[0117] Explanation of reference numerals

[0118] 1, tire; 2, skeleton portion; 4a, 4b, 4c, tread portion; 10, wheel portion (rim member); 20, ground deformation portion; 101, first rim portion; 102, second rim portion; 103, connecting portion; 104, support member; 105, fitting receiving portion; 106, bolt; 107, screw hole; 201, main spring; 202, elastic deformation portion; 203, locking portion; 203a, straight portion; 203b, curved portion; 212, elastic deformation portion; 213, limiting portion; 230, groove; 300, tread member; 301, core material; 302, nonwoven body; 302a, metal fiber; 303, reinforcing member; 400, metal film; 401, roll; 501, 502, 503, rim portion; 600, cutting tool; A, tire width direction; a1, fixed region; a2, ground contact region; B, tire radial direction; C, tire circumferential direction; D, central axis direction of the elastic deformation portion of the connecting spring; E, central axis direction of the limiting portion of the connecting spring in the shape of a circle; F, extension direction of the groove; O, central axis of the elastic deformation portion of the connecting spring; X, particle; Y, running surface.

Claims

1. A tire, wherein the tire comprises: a skeleton portion including a rim member, a plurality of body springs engaged to the rim member, and a plurality of link springs combined with the body springs; and a tread member disposed at least on an outer periphery of the skeleton portion, the tread member is composed of a nonwoven body including a plurality of metal fibers having a convex polygonal shape in cross section orthogonal to a length direction, a proportion of the metal fibers having the convex polygonal shape in cross section in the total number of fibers constituting the nonwoven body is 70% or more.

2. The tire according to claim 1, wherein the metal fibers have a rectangular shape in cross section orthogonal to the length direction.

3. The tire according to claim 1 or 2, wherein the metal fibers are made of an austenitic stainless steel or an aluminum alloy.

4. The tire according to claim 1 or 2, wherein the nonwoven body is composed only of the plurality of metal fibers.

5. The tire according to claim 1 or 2, wherein the plurality of metal fibers are integrated by mechanical entanglement.

6. The tire according to claim 1 or 2, wherein the nonwoven body is a sheet-shaped nonwoven fabric, the nonwoven fabric is disposed on the outer periphery of the skeleton portion in a form of a rod-shaped roll and in a manner of being at least partially buried in grooves divided by the body springs and the link springs.

7. The tire according to claim 6, wherein the nonwoven fabric is rolled up in a manner of being stacked in multiple layers in a radial direction.

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