JP6522936B2 - Non pneumatic tire - Google Patents

Description

  The present invention relates to a non-pneumatic tire which does not need to be filled with pressurized air in use.

In the case of the conventional pneumatic tire in which the inside is filled with pressurized air and used, the occurrence of punctures is an unavoidable structural problem.
In order to solve such problems, in recent years, for example, an attachment body attached to an axle, an outer cylinder for surrounding the attachment body from the outside in the tire radial direction, and an attachment body as shown in Patent Document 1 below. There has been proposed a non-pneumatic tire comprising a connecting member for movably connecting to an outer cylindrical body.

JP, 2011-156905, A

  However, in the conventional non-pneumatic tire, there is room for improvement in achieving weight reduction while suppressing a decrease in the strength of the connecting member.

  This invention is made in view of such a situation, Comprising: It aims at providing the non-pneumatic tire which can attain weight reduction, suppressing the fall of the intensity | strength of a connection member.

In order to achieve the above object, the present invention provides the following means.
A non-pneumatic tire according to the present invention displaceably connects an attachment body attached to an axle, a ring-like body surrounding the attachment body from the outside in the tire radial direction, the attachment body, and the ring-like body. A non-pneumatic tire comprising a connecting member, wherein the connecting member is provided with an elastic connecting plate whose both ends are separately connected to the attaching body and the ring-shaped body, and the elastic connecting plate is a tire A plurality of curved portions curving in the circumferential direction are formed along the extending direction in which the elastic connecting plate extends in a tire side view when the non-pneumatic tire is viewed from the tire width direction, and adjacent to each other in the extending direction The bending directions of the respective curved portions are opposite to each other, and in the elastic connection plate, in one of the inflection portions positioned between the curved portions adjacent to each other in the extending direction, this The thickness and cross-sectional area is minimized in sexual connecting plate, the thickness and cross-sectional area of the elastic connecting plate is Ri a gradually smaller as it goes from both sides on the one inflection portion along the extending direction, said transverse The minimum area of the area is characterized in that it is located on the exterior body side of the plurality of inflection parts .

According to the present invention, since the bending directions of the respective curved portions adjacent to each other in the extending direction are opposite to each other, when a compressive load in the tire radial direction is applied to the non-pneumatic tire, Since the inflection portion is hardly deformed and is mainly displaced, the load applied to the inflection portion in the elastic connection plate is suppressed as compared with other portions.
Then, the thickness and the cross-sectional area of one of such inflection portions are minimum and extended with respect to the thickness and the cross-sectional area of the other portions of the elastic connection plate excluding the one inflection portion. Since the one inflection point gradually becomes smaller from the both sides along the existing direction, and there is only one such part, it is possible to secure the flowability at the time of injection molding. Therefore, the distribution of the material of the elastic connection plate can be made uniform, the thickness of the elastic connection plate can be reduced, and weight reduction can be achieved effectively.

  According to the non-pneumatic tire according to the present invention, weight reduction can be achieved while suppressing a decrease in the strength of the connecting member.

FIG. 1 is a view showing a non-pneumatic tire according to an embodiment of the present invention, and is a schematic perspective view in which a portion of the non-pneumatic tire is disassembled. It is the tire side view which looked at the non-pneumatic tire shown in FIG. 1 from one side of the tire width direction. It is an enlarged view which shows the principal part of FIG. Among the non-pneumatic tires shown in FIG. 1, the tire side view of the first divided case body seen from one side in the tire width direction, or the tire side view seen the second divided case body from the other side in the tire width direction It is. It is the figure which looked at the 1st elastic connection board shown in FIG. 4, or the 2nd elastic connection board from the tire peripheral direction. It is the side view which looked at the 1st elastic connection board shown in FIG. 5, or the 2nd elastic connection board from the tire width direction. It is the figure which looked at the 1st elastic connection board by other embodiment or the 2nd elastic connection board from the tire peripheral direction.

  Hereinafter, an embodiment of a non-pneumatic tire according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the non-pneumatic tire 1 according to this embodiment includes a mounting body 11 mounted on an axle (not shown) and a cylindrical ring-shaped body surrounding the mounting body 11 from the outside in the tire radial direction. A plurality of connecting members 15 are disposed between the mounting body 11 and the ring-shaped body 13 along the tire circumferential direction, and connect the mounting body 11 and the ring-shaped body 13 relatively elastically and freely. And a cylindrical tread member 16 provided outside the ring-like body 13.

  The non-pneumatic tire 1 of the present embodiment may be employed in a small-sized vehicle traveling at a low speed, such as a steering wheel-type electric wheelchair defined in, for example, JIS T 9208. The size of the non-pneumatic tire 1 is not particularly limited, but may be, for example, 3.00-8. Also, the non-pneumatic tire 1 may be adopted for a passenger car. The size in this case is not particularly limited, but may be, for example, 155 / 65R13.

  The mounting body 11, the ring-shaped body 13 and the tread member 16 described above are disposed coaxially with the common axis. Hereinafter, this common axis is referred to as an axis O, a direction along the axis O is referred to as a tire width direction H, a direction orthogonal to the axis O is referred to as a tire radial direction, and a direction circling about the axis O is referred to as a tire circumferential direction. In addition, the center part of the tire width direction H in the attachment body 11 and the tread member 16 and the center part between two ring-shaped bodies 13 are arrange | positioned in the mutually corresponding state.

The mounting body 11 connects the mounting cylindrical portion 17 to which the tip end portion of the axle is mounted, the outer ring portion 18 surrounding the mounting cylindrical portion 17 from the outer side in the tire radial direction, the mounting cylindrical portion 17 and the outer ring portion 18 And a plurality of ribs 19.
The mounting cylindrical portion 17, the outer ring portion 18 and the rib 19 are integrally formed of, for example, a metal material such as an aluminum alloy. The mounting cylindrical portion 17 and the outer ring portion 18 are each formed in a cylindrical shape and disposed coaxially with the axis O. The plurality of ribs 19 are disposed, for example, at equal intervals in the circumferential direction.

On the outer peripheral surface of the outer ring portion 18, a plurality of key groove portions 18a recessed inward in the tire radial direction and extending in the tire width direction H are formed at intervals in the tire circumferential direction. The key groove portion 18 a is opened only on one side (outside of the vehicle body) in the tire width direction H on the outer peripheral surface of the outer ring portion 18 and closed on the other side (inside of the vehicle body) in the tire width direction H.
In the outer ring portion 18, a lightening hole 18b penetrating the outer ring portion 18 in the tire radial direction is spaced apart in the tire width direction H at a portion positioned between the key groove portions 18a adjacent in the tire circumferential direction. Multiple are formed. A plurality of hole rows 18c configured by the plurality of lightening holes 18b are formed at intervals in the tire circumferential direction. Similarly, each rib 19 is also formed with a through hole 19a penetrating the rib 19 in the tire width direction H.

At one end of the outer ring portion 18 in the tire width direction H, a recess 18d is formed at a position corresponding to the key groove 18a, into which the plate member 28 having the through hole 28a formed is fitted. The recess 18 d is recessed toward the other side in the tire width direction H. Further, among the wall surfaces defining the recess 18 d, a wall surface facing one side in the tire width direction H is formed with a female screw portion communicating with the through hole 28 a of the plate member 28 fitted in the recess 18 d.
A plurality of through holes 28a are formed in the plate member 28 at intervals in the tire circumferential direction.
Similarly, a plurality of female screw portions are formed on the wall surface of the recess 18 d at intervals in the tire circumferential direction. In the example of illustration, although the case where two through-holes 28a and two internal thread parts are formed is made into an example, it is not limited to two.

The mounting body 11 is provided with a cylindrical exterior body 12 fitted on the outer ring portion 18. On the inner circumferential surface of the exterior body 12, there is formed a ridge portion 12 a that protrudes inward in the tire radial direction and extends along the entire length in the tire width direction H. A plurality of protruding portions 12 a are formed on the inner peripheral surface of the exterior body 12 at intervals in the circumferential direction of the tire, and are fitted to the key groove portions 18 a formed in the mounting body 11 respectively.
Then, with the protrusion 12a fitted in the key groove 18a, the exterior body 12 is attached by screwing a bolt (not shown) through the through hole 28a of the plate 28 fitted in the recess 18d to the female screw It is fixed to the body 11.

Among the wall surfaces defining the key groove portion 18a, the pair of side wall surfaces facing each other in the tire circumferential direction and the bottom wall surface are formed to be orthogonal to each other. Further, among the outer surfaces of the ridges 12a, the pair of side wall surfaces rising from the inner circumferential surface of the exterior body 12 and the top wall surface facing inward in the tire radial direction are also formed to be orthogonal to each other. Further, the sizes in the tire circumferential direction of the protruding portion 12a and the key groove portion 18a are equal to each other.
With such a configuration, the projection 12a is fitted in the key groove 18a with little rattling and with high accuracy.

  The connecting member 15 connects the outer peripheral surface side of the mounting body 11 and the inner peripheral surface side of the ring-shaped body 13 relatively elastically and freely. In the illustrated example, the connecting member 15 includes a first elastic connecting plate 21 and a second elastic connecting plate 22 which connect the outer peripheral surface of the exterior body 12 of the mounting body 11 and the inner peripheral surface of the ring-shaped body 13 to each other. . The first elastic connection plate 21 and the second elastic connection plate 22 are both made of elastically deformable plate materials.

  A plurality of first elastic connection plates 21 are arranged at one position along the tire width direction H along the tire circumferential direction. A plurality of second elastic connection plates 22 are disposed along the tire circumferential direction at a position on the other side along the tire width direction H. That is, the first elastic connection plate 21 and the second elastic connection plate 22 are disposed at an interval from each other in the tire width direction H, and a plurality of the first elastic connection plates 21 and the second elastic connection plates 22 are disposed along the tire circumferential direction at each position. For example, 60 first elastic connection plates 21 and 60 second elastic connection plates 22 are provided along the circumferential direction of the tire.

The plurality of connecting members 15 are separately disposed at positions rotationally symmetrical with respect to the axis O between the exterior body 12 and the ring-shaped body 13. Further, all the connecting members 15 have the same shape and the same size, and the lateral width of the connecting members 15 in the tire width direction H is smaller than the lateral width of the ring-like body 13 in the tire width direction H.
Then, the first elastic connection plates 21 adjacent to each other in the tire circumferential direction are not in contact with each other. Similarly, the second elastic connection plates 22 adjacent in the tire circumferential direction are not in contact with each other. Further, the first elastic connection plate 21 and the second elastic connection plate 22 adjacent in the tire width direction H are not in contact with each other. Furthermore, the first elastic connection plate 21 and the second elastic connection plate 22 have the same lateral width and thickness along the tire width direction H.
Here, the thicknesses of the first elastic connection plate 21 and the second elastic connection plate 22 are thicknesses in a direction perpendicular to a tangent at an arbitrary point on the surface of the elastic connection plates 21, 22.

As shown in FIGS. 3 and 4, one end (outer end 21 a) of the first elastic connection plate 21 connected to the ring-shaped body 13 is the other end (inner end) connected to the exterior body 12. It is located on one side in the tire circumferential direction than the portion 21b). On the other hand, one end (outer end 22 a) of the second elastic connection plate 22 connected to the ring-shaped body 13 is more than the other end (inner end 22 b) connected to the exterior body 12. It is located on the other side in the tire circumferential direction.
The outer end portions 21a and 22a of the first elastic connection plate 21 and the second elastic connection plate 22 constituting one connection member 15 are positioned in the tire width direction H on the inner peripheral surface of the ring-shaped body 13. It is connected to the same position in the tire circumferential direction in a mutually different state.

As shown in FIGS. 3, 5 and 6, the first elastic connection plate 21 and the second elastic connection plate 22 are intermediately positioned between the outer end 21a, 22a and the inner end 21b, 22b. A plurality of curved portions 21 d to 21 f and 22 d to 22 f which are curved in the tire circumferential direction are formed in the portions.
The plurality of curved portions 21 d to 21 f and 22 d to 22 f are extension directions in which the first elastic connection plate 21 and the second elastic connection plate 22 extend in a tire side view when the non-pneumatic tire 1 is viewed from the tire width direction H. It is formed along the In the illustrated example, the plurality of curved portions 21 d to 21 f in the first elastic connection plate 21 and the plurality of curved portions 22 d to 22 f in the second elastic connection plate 22 are adjacent to each other in the extension direction and the bending direction Are opposite to each other.

  The plurality of curved portions 21d to 21f formed on the first elastic connection plate 21 are curved in such a manner as to protrude toward the other side in the tire circumferential direction, the first curved portion 21d, and the outer end A second curved portion 21e positioned between the first portion 21a and the second curved portion 21e curved so as to protrude toward one side in the tire circumferential direction, and positioned between the first curved portion 21d and the inner end 21b; And it has the 3rd curved part 21f curved so that it might be projected toward one side of a tire peripheral direction. The second curved portion 21e is continuous with the outer end 21a.

  The plurality of curved portions 22d to 22f formed on the second elastic connection plate 22 are a first curved portion 22d curved so as to protrude toward one side in the tire circumferential direction, a first curved portion 22d, and an outer end A second curved portion 22e which is located between the first portion 22a and the second curved portion 22e curved so as to protrude toward the other side in the tire circumferential direction, and is located between the first curved portion 22d and the inner end 22b; And it has the 3rd curved part 22f curved so that it might protrude toward the other side of a tire peripheral direction. The second curved portion 22e is continuous with the outer end 22a.

  In the illustrated example, the first curved portions 21 d and 22 d are formed to have a larger radius of curvature in a tire side view than the second curved portions 21 e and 22 e and the third curved portions 21 f and 22 f. The second elastic connection plate 22 is disposed at a central portion in the extending direction.

The lengths of the first elastic connection plate 21 and the second elastic connection plate 22 are equal to each other. The inner end portions 21 b and 22 b of the first elastic connection plate 21 and the second elastic connection plate 22 are from the position facing the outer end portions 21 a and 22 a in the tire radial direction on the outer peripheral surface of the exterior body 12 in a tire side view, It is separately connected at the same distance on one side and the other side in the tire circumferential direction centering on the axis O, respectively.
In addition, the first curved portions 21d and 22d of the first elastic connecting plate 21 and the second elastic connecting plate 22, the second curved portions 21e and 22e, and the third curved portions 21f and 22f are in the tire circumferential direction. The direction in which it collides is reversed, and the size is made equal.

  With the above configuration, the shape of the side view of each connecting member 15 extends in the tire radial direction as shown in FIG. 3 and the first elastic connecting plate 21 and the second elastic connecting plate 22 The imaginary line L passing through each of the outer end portions 21a and 22a is axisymmetrical with the symmetry axis.

  The first elastic connecting plate 21 and the second elastic connecting plate 22 are located at positions between the curved portions 21 d to 21 f and 22 d to 22 f adjacent to each other in the extending direction of the connecting plates 21 and 22, Inflection parts 21g, 21h, 22g and 22h are formed respectively.

These inflection parts 21g, 21h, 22g, 22h are respectively provided between the curved parts 21d to 21f, 22d to 22f adjacent to each other in the extending direction in each of the first elastic connection plate 21 and the second elastic connection plate 22. positioned.
Further, at one of the inflection portions 21g, 21h, 22g, 22h, the first elastic connection plate 21 and the second elastic connection plate 22 cross in the tire width direction H and orthogonal to the extending direction The surface area (cross-sectional area) is formed to be minimum. That is, the size and the cross sectional area of the elastic connecting plates 21 and 22 in the tire width direction H gradually increase toward the one inflection portion 21g, 21h, 22g and 22h (from both sides) along the extending direction. It is formed to be small. In the present embodiment, the size and the cross-sectional area in the tire width direction H are minimum in the inflection portions 21h (22h) between the curved portions 21d (22d) and 21f (22f).

  The exterior body 12, the ring-like body 13 and the plurality of connecting members 15 described above are integrally formed of, for example, a synthetic resin material. The synthetic resin material may be, for example, only one kind of resin material, a mixture containing two or more kinds of resin materials, or a mixture containing one or more kinds of resin materials and one or more kinds of elastomers. Additives such as anti-aging agents, plasticizers, fillers, or pigments may be included.

By the way, as FIG. 1 shows, the exterior body 12 has the 1st exterior body 25 located in one side of the tire width direction H, and the 2nd exterior body 26 located in the other side of the tire width direction H. It is divided. Similarly, the ring-like body 13 is divided into a first ring-like body 23 located on one side in the tire width direction H and a second ring-like body 24 located on the other side in the tire width direction H .
In the example of illustration, the exterior body 12 and the ring-shaped body 13 are divided | segmented by the center part of the tire width direction H, respectively.

And the 1st exterior body 25 and the 1st ring-like object 23 are formed in one with the 1st elastic connection board 21, for example by injection molding. The second exterior body 26 and the second ring-shaped body 24 are integrally formed with the second elastic connection plate 22 by, for example, injection molding. That is, the exterior body 12, the ring-shaped body 13, and the connection member 15 which the connection member 15 connects among the attachment bodies 11 are integrally formed by the synthetic resin material.
Hereinafter, a unit in which the first exterior body 25, the first ring-shaped body 23 and the first elastic connection plate 21 are integrally formed is referred to as a first divided case body 31, and a second exterior body 26 and a second ring-shaped body 24. A unit in which the second elastic connection plate 22 is integrally formed is referred to as a second divided case body 32.

As the injection molding, in the case of the first divided case body 31, for example, a general method of simultaneously molding the entire first divided case body 31 may be used, or the first outer body 25, the first ring It may be insert molding which injects and molds a part of the rod-like body 23 and the first elastic connection plate 21 as an insert and the so-called two-color molding or the like. In the case where the entire first divided case body 31 is simultaneously injection-molded, the plurality of projecting streaks 12 a formed on the exterior body 12 may be used as the gate portion.
These points also apply to the second divided case body 32.

Further, in the case of injection molding, taking the first divided case body 31 as an example, the first exterior body 25, the first ring-shaped body 23, and the first elastic connection plate 21 may be formed of different materials. And may be formed of the same material. Examples of this material include metal materials and resin materials, but from the viewpoint of weight reduction, resin materials, particularly thermoplastic resins, are preferable.
These points also apply to the second divided case body 32.

  The edges of the first ring-shaped body 23 and the second ring-shaped body 24 facing each other in the tire width direction H are connected by, for example, welding, fusion bonding, or adhesion. In the case of welding, for example, hot plate welding may be employed. Similarly, in the first exterior body 25 and the second exterior body 26, the edges facing in the tire width direction H are in contact with each other.

The first divided case body 31 and the second divided case body 32 have the same shape and size as shown in FIG. And when connecting the 1st division case body 31 and the 2nd division case body 32 integrally as mentioned above, the 1st division case is carried out so that each connection member 15 may become line symmetry as mentioned above by tire side view. While the body 31 and the second divided case body 32 are aligned in the tire circumferential direction, with the first divided case body 31 and the second divided case body 32 facing in the tire width direction H, the first ring End edges of the body 23 and the second ring-shaped body 24 in the tire width direction H are butted and connected.
Then, the non-pneumatic tire 1 can be obtained by providing the tread member 16 with respect to the 1st division | segmentation case body 31 and the 2nd division | segmentation case body 32 which were united integrally.

As shown in FIG. 2, the tread member 16 is formed in a cylindrical shape, and covers the entire outer peripheral surface side of the ring-shaped body 13 integrally. The tread member 16 is formed of, for example, a natural rubber and / or a vulcanized rubber obtained by vulcanizing a rubber composition, or a thermoplastic material or the like.
As a thermoplastic material, a thermoplastic elastomer or a thermoplastic resin etc. are mentioned, for example. As the thermoplastic elastomer, for example, an amide-based thermoplastic elastomer (TPA), an ester-based thermoplastic elastomer (TPC), an olefin-based thermoplastic elastomer (TPO), a styrene-based thermoplastic elastomer (TPS) and a urethane as defined in JIS K6418 Examples include thermoplastic elastomers (TPU), crosslinked thermoplastic rubbers (TPV), and other thermoplastic elastomers (TPZ).
As a thermoplastic resin, a urethane resin, an olefin resin, a vinyl chloride resin, or a polyamide resin etc. are mentioned, for example. From the viewpoint of wear resistance, the tread member 16 is preferably formed of vulcanized rubber.

  According to the non-pneumatic tire 1 of the present embodiment configured as described above, as shown in FIGS. 3, 5 and 6, in the first and second elastic connection plates 21 and 22, respectively, Since the bending directions of the respective curved portions 21 d to 21 f and 22 d to 22 f adjacent to each other in the extending direction are opposite to each other, when a compressive load in the tire radial direction is applied to this non-pneumatic tire 1 Since the inflection portions 21g, 21h, 22g, and 22h are hardly deformed and are mainly displaced, the inflection portions 21g, 21h, 22g, and the like in the first and second elastic connection plates 21 and 22, respectively. The load applied to 22 h is suppressed compared to the other parts.

The thickness and the cross-sectional area of one of the inflection parts 21g, 21h, 22g, 22h (in the present embodiment, the inflection parts with reference numerals 21h, 22h) are the first and second elastic connection plates 21, 22 from the both sides of the one inflection portion 21h, 22h along the extending direction at a minimum with respect to the thickness and the cross-sectional area in the other portion excluding the one inflection portion 21h, 22h among the respective 22 As it becomes smaller gradually as it goes, and there is only one portion (flections 21h, 22h) in each of the first and second elastic connection plates 21, 22, flowability at the time of injection molding can be secured.
Therefore, the distribution of the materials of the first and second elastic connection plates 21 and 22 can be made uniform, and the thickness of the first and second elastic connection plates 21 and 22 can be reduced. Weight reduction can be achieved effectively.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

  For example, the connection member 15 may not have a plurality of inflection portions. For example, the thickness and the cross-sectional area may be gradually reduced from the outer end 21a and the inner end 21b toward the central portion in the extending direction of the connecting member 15.

For example, the connection member 15 may not have a plurality of inflection portions. For example, the thickness and the cross-sectional area may be gradually reduced from the outer end 21a and the inner end 21b toward the central portion in the extending direction of the connecting member 15.
Further, in the present embodiment, the thickness and the cross-sectional area of the inflection portion 21h (22h) between the bending portions 21d (22d) and 21f (22f) are minimized, but the inflection portion at this position For example, in the above embodiment, the configuration in which the thickness and the cross-sectional area of the inflection portions 21g (22g) between the bending portions 21d (22d) and 21e (22e) are minimized It is also possible.

  Further, the inner end portions 21b and 22b of the first elastic connection plate 21 and the second elastic connection plate 22 are, for example, sandwiching the axis O in the tire radial direction on the outer peripheral surface of the exterior body 12 instead of the embodiment described above. The outer diameters of the first elastic connecting plate 21 and the second elastic connecting plate 22 may be different from each other at the positions opposite to each other. You may connect to the position etc. which oppose in a direction. Further, in place of the present embodiment, the respective outer end portions 21a and 22a of the first elastic connection plate 21 and the second elastic connection plate 22 are made different from each other in the tire circumferential direction position on the inner peripheral surface of the ring-shaped body 13. You may connect.

Furthermore, in the present embodiment, a gap in the tire width direction H may or may not be provided between the first exterior body 25 and the second exterior body 26. In addition, the exterior body 12 and the ring-shaped body 13 may or may not be divided into three or more in the tire width direction H.
Furthermore, the first exterior body 25 (first divided case body 31) and the second exterior body 26 (second divided case body 32) may be integrated as shown in FIG. In this case, the first elastic connection plate 21 and the second elastic connection plate 22 are integrally provided, and the first elastic connection plate 21 and the second elastic connection plate 22 are viewed from the front of the tire as viewed from the circumferential direction of the tire. The imaginary line L1 passing through the respective outer end portions 21a and 22a is axisymmetrical with the symmetry axis.

Furthermore, in the above-mentioned embodiment, although the exterior body 12, the ring-shaped body 13, and the connection member 15 are integrally formed by, for example, injection molding, they may be integrally formed by, for example, casting instead of injection molding. Moreover, after forming the exterior body 12, the ring-shaped body 13, and the connection member 15 separately, you may mutually connect these.
Furthermore, in the embodiment described above, although the connecting member 15 is indirectly connected to the outer ring portion 18 of the mounting body 11 via the exterior body 12, the present invention is not limited to this. For example, the mounting body The connection member 15 may be directly connected to the outer ring portion 18 of 11.

  In addition, it is possible to replace components in the above-mentioned embodiment with known components as appropriate without departing from the spirit of the present invention.

Next, the verification test about the effect demonstrated above was implemented.
The non-pneumatic tire 1 shown in FIGS. 1 to 6 is adopted as an example, and in the non-pneumatic tire 1 of the example as a comparative example, the size in the tire width direction H in each of the elastic connection plates 21 and 22 A non-pneumatic tire is adopted in which the size in the tire width direction H at the other end 21b, 22b is equal over the entire length in the extending direction.
All of these non-pneumatic tire sizes were 155/65 R13.
Then, these two types of non-pneumatic tires were compressed in the tire radial direction, and the compressive force when the connecting member was broken was calculated by numerical analysis.
As a result, the weight of the non-pneumatic tire of the comparative example can be reduced by 15% in the non-pneumatic tire 1 of the example, and the compressive force of the non-pneumatic tire of the comparative example can be reduced. It was confirmed that the non-pneumatic tire 1 was improved by 20%.

Reference Signs List 1 non-pneumatic tire 11 attached body 12 outer body 13 ring-shaped body 15 connecting member 16 tread member 18 outer ring portion 21 first elastic connecting plate 21d to 21f curved portion 21g, 21h bent portion 22 second elastic connecting plate 22d to 22f Curved portion 22g, 22h Curved portion O Axis H Tire width direction

Claims (1)

A mounting body attached to the axle,
A ring-shaped body surrounding the mounting body from the outside in the tire radial direction;
And a connecting member that displaceably connects the mounting body and the ring-shaped body.
The connection member is a non-pneumatic tire including elastic connection plates whose both ends are separately connected to the attachment body and the ring-shaped body, respectively.
A plurality of curved portions curving in the circumferential direction of the tire are formed on the elastic connection plate along the extending direction in which the elastic connection plate extends in a side view of the non-pneumatic tire as viewed from the tire width direction.
The bending directions of the bending portions adjacent to each other in the extending direction are opposite to each other,
In the elastic connecting plate, the thickness and the cross-sectional area of the elastic connecting plate are minimized in one of the inflection portions positioned between the curved portions adjacent to each other in the extending direction,
The thickness and cross-sectional area of the elastic connecting plate is Ri a gradually smaller as it goes from both sides on the one inflection portion along the extending direction,
The non-pneumatic tire according to claim 1 , wherein the minimum area of the cross-sectional area is located on the exterior body side of the plurality of inflection portions .

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