WO2014103680A1 - 非空気入りタイヤ - Google Patents
非空気入りタイヤ Download PDFInfo
- Publication number
- WO2014103680A1 WO2014103680A1 PCT/JP2013/082958 JP2013082958W WO2014103680A1 WO 2014103680 A1 WO2014103680 A1 WO 2014103680A1 JP 2013082958 W JP2013082958 W JP 2013082958W WO 2014103680 A1 WO2014103680 A1 WO 2014103680A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tire
- elastic connecting
- connecting plate
- width direction
- ring member
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B9/00—Wheels of high resiliency, e.g. with conical interacting pressure-surfaces
- B60B9/02—Wheels of high resiliency, e.g. with conical interacting pressure-surfaces using springs resiliently mounted bicycle rims
- B60B9/04—Wheels of high resiliency, e.g. with conical interacting pressure-surfaces using springs resiliently mounted bicycle rims in leaf form
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B5/00—Wheels, spokes, disc bodies, rims, hubs, wholly or predominantly made of non-metallic material
- B60B5/02—Wheels, spokes, disc bodies, rims, hubs, wholly or predominantly made of non-metallic material made of synthetic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C7/00—Non-inflatable or solid tyres
- B60C7/10—Non-inflatable or solid tyres characterised by means for increasing resiliency
- B60C7/14—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C7/00—Non-inflatable or solid tyres
- B60C7/24—Non-inflatable or solid tyres characterised by means for securing tyres on rim or wheel body
Definitions
- the present invention relates to a non-pneumatic tire that does not need to be filled with pressurized air when used.
- This application claims priority based on Japanese Patent Application No. 2012-282626 for which it applied to Japan on December 26, 2012, and uses the content here.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a non-pneumatic tire that can be easily assembled and can reduce the weight and improve the ride comfort.
- a non-pneumatic tire of the present invention includes an attachment body attached to an axle, an inner cylinder body that is externally mounted on the attachment body, and a ring member that includes an outer cylinder body that surrounds the inner cylinder body from the outside in the tire radial direction, A plurality of connecting members that are disposed along the tire circumferential direction between the inner cylindrical body and the outer cylindrical body, and that connect the two cylindrical bodies to each other, and at least one of the ring members
- the part and the plurality of connecting members have a bending elastic modulus obtained by a three-point bending test based on ISO 178 higher than 300 MPa, and a deflection temperature under load of 0.455 MPa obtained based on ASTM D648 is 62 ° C. or higher.
- the synthetic resin material is integrally formed.
- both end portions of the plurality of connecting members are connected to the inner cylindrical body and Even if each of the ring members is not connected to the outer cylinder, it is sufficient to attach the case body integrally formed with at least a part of the ring members and the plurality of connecting members to the attachment body, so that the manufacturing time can be shortened.
- at least a part of the ring member and the plurality of connecting members are integrally formed, for example, both ends of the connecting member and the inner cylinder and the outer cylinder are connected using a fastening member or the like. The weight can be reduced compared to the case of doing.
- the above-mentioned bending elastic modulus of the synthetic resin material integrally forming at least a part of the ring members and the plurality of connecting members is set in the above range, it is necessary and sufficient for the non-pneumatic tire. Strength can be reliably provided. Moreover, when the above-mentioned bending elastic modulus of this synthetic resin material is 12000 MPa or less, comfortable riding comfort can be provided. And since the above-mentioned deflection temperature under load of this synthetic resin material is set to the above-mentioned range, it can prevent softening by outside temperature.
- the non-pneumatic tire mounted is running, even if the non-pneumatic tire rotates repeatedly at high speed and is repeatedly deformed, the non-pneumatic tire is greatly deformed to the extent that it cannot travel due to softening due to heat. Can also be prevented.
- the connecting member includes a first elastic connecting plate and a second elastic connecting plate that connect the cylinders, and one end of the first elastic connecting plate connected to the outer cylinder is Further, it may be located on one side in the tire circumferential direction from the other end connected to the inner cylinder. Moreover, the one end part connected with the said outer cylinder body among the said 2nd elastic connection plates may be located in the other side of a tire circumferential direction rather than the other end part connected with the said inner cylinder body.
- a plurality of the first elastic connecting plates are arranged along a tire circumferential direction at a position in one tire width direction, and the second elastic connecting plates are different from the one in the tire width direction.
- a plurality of tires may be arranged in the tire width direction position along the tire circumferential direction.
- a plurality of first elastic coupling plates are arranged along the tire circumferential direction at one tire width direction position, and a plurality of second elastic coupling plates are arranged along the tire circumferential direction at other tire width direction positions. Since it is arrange
- the ring member is divided into a one-side divided ring member located on one side in the tire width direction and a second-side divided ring member located on the other side in the tire width direction, and the one-side divided ring member is
- the first elastic connecting plate may be formed integrally, and the other split ring member may be formed integrally with the second elastic connecting plate.
- the first divided case body in which the one side divided ring member and the first elastic connecting plate are integrally formed and the second divided case in which the other side divided ring member and the second elastic connecting plate are integrally formed.
- the tire extends in a certain direction in a side view of the tire as viewed from the tire width direction. Only one of them is provided in plural, and the other extending in the other direction is not provided. For this reason, when forming a ring member and a connection member, first, the 1st and 2nd division
- one side split ring member and the first elastic connecting plate, and the other side split ring member and the second elastic connecting plate may be integrally formed by injection molding.
- the non-pneumatic tire can be formed more easily.
- only one of the two elastic connecting plates is disposed between the outer cylindrical body and the inner cylindrical body.
- each one end portion of the first elastic connecting plate and the second elastic connecting plate in one connecting member has a different position in the tire width direction on the inner peripheral surface of the outer cylindrical body, and thus in the tire circumferential direction.
- the connecting members are connected at the same position, and the connecting members are formed symmetrically with respect to an imaginary line extending along the tire radial direction and passing through the one end portions in a tire side view when the tire is viewed from the tire width direction. May be.
- the connecting member is formed in line symmetry with respect to the imaginary line in the tire side view, the spring constant along one side in the tire circumferential direction and the spring constant along the other side in this non-pneumatic tire Therefore, it is possible to suppress the difference between the two, and it is possible to provide good maneuverability.
- the non-pneumatic tire can be easily assembled and the weight can be reduced.
- FIG. 1 it is the schematic perspective view which decomposed
- the non-pneumatic tire 1 includes an attachment body 11 that is attached to an axle (not shown), an inner cylinder body 12 that is externally mounted on the attachment body 11, and an outer cylinder body 13 that surrounds the inner cylinder body 12 from the outside in the tire radial direction.
- a plurality of ring members 14 are disposed along the tire circumferential direction between the inner cylindrical body 12 and the outer cylindrical body 13, and both the cylindrical bodies 12, 13 are connected to each other so as to be relatively elastically displaceable.
- a connecting member 15 and a tread member 16 disposed on the outer peripheral surface side of the outer cylindrical body 13 over the entire periphery thereof are provided.
- the attachment body 11, the inner cylinder body 12, the outer cylinder body 13, and the tread member 16 are each arranged coaxially with the common shaft.
- the 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
- a direction around the axis O is referred to as a tire circumferential direction.
- the attachment body 11, the inner cylinder body 12, the outer cylinder body 13, and the tread member 16 are disposed such that the center portions in the tire width direction H are aligned with each other.
- the outer cylinder 13 is larger in size in the tire width direction H than the inner cylinder 12, that is, the width is larger.
- a plurality of protrusions 12a that protrude toward the inner side in the tire radial direction and extend over the entire length in the tire width direction H are disposed on the inner peripheral surface of the inner cylindrical body 12 at intervals in the tire circumferential direction. ing.
- the attachment body 11 includes a mounting cylinder portion 17 to which the front end portion of the axle is mounted, an outer ring portion 18 that surrounds the mounting cylinder portion 17 from the outside in the tire radial direction, and a mounting body 11. And a plurality of ribs 19 that connect the cylindrical portion 17 and the outer ring portion 18.
- the mounting cylinder portion 17, the outer ring portion 18, and the rib 19 are integrally formed of a metal material such as an aluminum alloy.
- the mounting cylinder portion 17 and the outer ring portion 18 are each formed in a cylindrical shape and arranged coaxially with the axis O.
- the plurality of ribs 19 are arranged at equal intervals in the circumferential direction.
- a plurality of key groove portions 18a that are recessed toward the inside in the tire radial direction and that extend in the tire width direction H are formed on the outer peripheral surface of the outer ring portion 18 at intervals in the tire circumferential direction.
- the key groove portion 18 a is opened only on one side of both ends in the tire width direction H on the outer peripheral surface of the outer ring portion 18, and the other side is closed.
- the protrusions 12a of the inner cylinder 12 of the ring member 14 are fitted in these key groove portions 18a.
- the pair of side wall surfaces and the bottom wall surface facing each other in the tire circumferential direction form a right angle.
- a pair of side wall surfaces rising from the inner peripheral surface of the inner cylindrical body 12 and a top wall surface facing the inner side in the tire radial direction out of the outer surface of the protruding portion 12a form a right angle.
- the sizes of the protrusion 12a and the key groove 18a in the tire circumferential direction are equal to each other.
- a recess 18 b that is recessed toward the other side in the tire width direction H and into which the plate material 28 is fitted is located at a position corresponding to the key groove portion 18 a. Is formed.
- a through hole is formed in the plate material 28, and a female screw portion communicating with the through hole of the plate material 28 fitted in the recess 18b on a wall surface facing the one side in the tire width direction H among the wall surfaces defining the recess 18b. Is formed. Note that a plurality of these internal thread portions and through holes are formed at intervals in the tire circumferential direction.
- the ring member 14 is bolted through the through hole of the plate member 28 fitted in the recess 18b in a state where the inner cylinder 12 is fitted on the attachment body 11 and the protrusion 12a is fitted in the key groove 18a. Is fixed to the attachment body 11 by screwing into the female thread portion.
- the protruding portion 12a is formed in the tire width direction H by the plate member 28 and the other wall surface facing the one side located at the other end in the tire width direction H among the wall surfaces defining the recess 18b. It is sandwiched.
- a plurality of hollow holes penetrating in the tire radial direction are arranged at intervals in the tire width direction H in a portion located between the key groove portions 18 a adjacent in the tire circumferential direction.
- a plurality of hole rows 18c are formed at intervals in the tire circumferential direction.
- the rib 19 is also formed with a hole 19a penetrating in the tire width direction H.
- the tread member 16 is formed in a cylindrical shape and integrally covers the outer peripheral surface side of the outer cylindrical body 13 of the ring member 14 over the entire area.
- the tread member 16 is made of, for example, vulcanized rubber obtained by vulcanizing natural rubber or / and a rubber composition, or a thermoplastic material.
- the thermoplastic material include a thermoplastic elastomer or a thermoplastic resin.
- the thermoplastic elastomer include amide-based thermoplastic elastomer (TPA), ester-based thermoplastic elastomer (TPC), olefin-based thermoplastic elastomer (TPO), and styrene-based thermoplastic elastomer (TPS) defined in Japanese Industrial Standard JIS K6418.
- thermoplastic resin examples include urethane resin, olefin resin, vinyl chloride resin, and polyamide resin. From the viewpoint of wear resistance, it is preferable to form the tread member 16 from vulcanized rubber.
- the connecting member 15 includes a first elastic connecting plate 21 and a second elastic connecting plate 22 that connect the inner cylinder 12 and the outer cylinder 13 in the ring member 14 to each other.
- a plurality of first elastic connecting plates 21 are arranged along a tire circumferential direction at predetermined positions along one tire width direction H
- the second elastic connecting plates 22 are arranged in the one tire width direction H.
- a plurality (60 in the illustrated example) are provided along the tire circumferential direction so as to be arranged along the tire circumferential direction at other positions along the tire width direction H different from the predetermined positions along the tire. ing.
- the plurality of first elastic connecting plates 21 are arranged at the same position in the tire width direction H along the tire circumferential direction, and the plurality of second elastic connecting plates 22 are separated from the first elastic connecting plate 21.
- a plurality of tires are arranged at predetermined positions along the tire width direction H that are separated in the tire width direction H along the tire circumferential direction.
- the plurality of connecting members 15 are arranged between the inner cylinder 12 and the outer cylinder 13 of the ring member 14 at positions that are rotationally symmetric with respect to the axis O. All the connecting members 15 have the same shape and the same size. Furthermore, the width of the connecting member 15 is smaller than the width of the outer cylinder 13.
- the first elastic coupling plates 21 adjacent in the tire circumferential direction are not in contact with each other, and the second elastic coupling plates 22 adjacent in the tire circumferential direction are also in non-contact with each other. Further, the first elastic connecting plate 21 and the second elastic connecting plate 22 adjacent in the tire width direction H are also not in contact with each other.
- the first elastic connecting plate 21 and the second elastic connecting plate 22 have the same width. The thicknesses of the first elastic connecting plate 21 and the second elastic connecting plate 22 are also equal to each other.
- one end 21a connected to the outer cylinder 13 is located on one side in the tire circumferential direction from the other end 21b connected to the inner cylinder 12, Of the two elastic connecting plates 22, one end 22 a connected to the outer cylinder 13 is located on the other side in the tire circumferential direction with respect to the other end 22 b connected to the inner cylinder 12. Further, the one end portions 21 a and 22 a of the first elastic connecting plate 21 and the second elastic connecting plate 22 in one connecting member 15 are made to have different positions in the tire width direction H on the inner peripheral surface of the outer cylindrical body 13. And are connected to the same position in the tire circumferential direction.
- each of the first elastic connecting plate 21 and the second elastic connecting plate 22 intermediate portions 21c and 22c positioned between the one end portions 21a and 22a and the other end portions 21b and 22b are arranged in the tire circumferential direction.
- a plurality of curved portions 21d to 21f and 22d to 22f that are curved are formed along the direction in which the connecting plates 21 and 22 extend in a tire side view when the tire 1 is viewed from the tire width direction H.
- the bending directions of the bending portions 21d to 21f and 22d to 22f adjacent to each other in the extending direction among the plurality of bending portions 21d to 21f and 22d to 22f are opposite to each other. It has become.
- the plurality of curved portions 21d to 21f formed on the first elastic connecting plate 21 are a first curved portion 21d curved so as to project toward the other side in the tire circumferential direction, a first curved portion 21d, and one end portion.
- the second curved portion 21e which is located between the first curved portion 21d and the other end portion 21b, and is located between the first curved portion 21a and the tire circumferential direction.
- a third bending portion 21f that is curved so as to project toward one side in the circumferential direction.
- the plurality of curved portions 22d to 22f formed on the second elastic connecting plate 22 are a first curved portion 22d curved so as to project toward one side in the tire circumferential direction, a first curved portion 22d, and one end portion.
- first bending portions 21d and 22d have larger curvature radii in the tire side view than the second bending portions 21e and 22e and the third bending portions 21f and 22f.
- the first curved portions 21d and 22d are disposed in the central portion of the first elastic connecting plate 21 and the second elastic connecting plate 22 in the extending direction.
- the lengths of the two elastic connecting plates 21 and 22 are equal to each other, and the other end portions 21b and 22b of the two elastic connecting plates 21 and 22 are, as shown in FIG.
- the same angle for example, 20 ° or more
- the first bending portions 21d and 22d, the second bending portions 21e and 22e, and the third bending portions 21f and 22f of the first elastic connecting plate 21 and the second elastic connecting plate 22 are mutually in the tire circumferential direction.
- the opposite direction is the same and the size is the same.
- each connecting member 15 in the tire side view is, as shown in FIG. 4, an imaginary line extending along the tire radial direction and passing through the one end portions 21 a and 22 a of both connecting plates 21 and 22. It is line symmetric with respect to L.
- the one end side portion extending from the central portion in the extending direction to the one end portions 21a and 22a is more than the other end side portion extending from the central portion to the other end portions 21b and 22b.
- the thickness is increased.
- the ring member 14 and the plurality of connecting members 15 are integrally formed of a synthetic resin material.
- This synthetic resin material has a flexural modulus higher than 300 MPa obtained by a three-point bending test based on ISO 178, and a deflection temperature under load of 0.455 MPa obtained based on ASTM D648 is 62 ° C. or higher. Yes.
- the bending elastic modulus of this synthetic resin material is 12000 MPa or less.
- the synthetic resin material may be a single resin material, a mixture containing two or more resin materials, or a mixture containing one or more resin materials and one or more elastomers.
- additives such as anti-aging agents, plasticizers, fillers, or pigments may be included.
- the bending elastic modulus When the bending elastic modulus is 300 MPa or more, it can have durability against bending required as a tire material, and when the deflection temperature under load at 0.455 MPa is 62 ° C. or more, when used as a tire. It is possible to maintain durability against heat generated by repeated deformation.
- the fact that the above-mentioned deflection temperature under load of this synthetic resin material is 62 ° C. or more includes that the above-mentioned deflection temperature under load is not measured in a temperature range of 160 ° C. or less.
- this synthetic resin material exhibits the same effect even when the deflection temperature under load at 1.82 MPa obtained according to ASTM D648 is 60 ° C. or higher.
- the test direction at the time of measuring the deflection temperature under load described above is flatwise, it may be edgewise.
- the ring member 14 is divided into one side split ring member 23 located on one side in the tire width direction H and the other side division located on the other side in the tire width direction H. It is divided into a ring member 24. In the illustrated example, the ring member 14 is divided at the center in the tire width direction H.
- the one-side split ring member 23 is formed integrally with the first elastic connecting plate 21, and the other-side split ring member 24 is formed integrally with the second elastic connecting plate 22. Further, in the present embodiment, the one-side split ring member 23 and the first elastic connecting plate 21, and the other-side split ring member 24 and the second elastic connecting plate 22 are integrally formed by injection molding.
- a structure in which the one-side split ring member 23 and the first elastic connecting plate 21 are integrally formed is referred to as a first split case body 31, and the other-side split ring member 24 and the second elastic connecting plate 22 are integrally formed. This is referred to as a second divided case body 32.
- the injection molding may be a general method in which the entire first and second divided case bodies 31 and 32 are respectively molded simultaneously, or the first and second divided case bodies 31 and 32 respectively.
- 1, the other side split ring members 23, 24, and one of the first and second elastic connecting plates 21, 22 may be insert molding in which the other is injection molded, or so-called two-color molding. Etc.
- the one side and the other side split ring members 23 and 24 and the first and second elastic connecting plates 21 and 22 are formed of different materials. Alternatively, the same material may be used.
- a plurality of protrusions 12a formed on the inner cylindrical body 12 may be used as a gate portion.
- the inner cylindrical body 12 has a width smaller than that of the outer cylindrical body 13, and each of the first elastic connecting plate 21 and the second elastic connecting plate 22. It is equivalent to the width.
- the edges in the tire width direction H of the outer cylinder 13 of the one-side split ring member 23 and the outer cylinder 13 of the other-side split ring member 24 are connected by, for example, welding, fusion, or adhesion. Yes.
- welding for example, hot plate welding or the like may be employed.
- the ends in the tire width direction H of the inner cylinder 12 of the one-side split ring member 23 and the inner cylinder 12 of the other-side split ring member 24 are separated in the tire width direction H. Thereby, it is prevented that the burr
- first divided case body 31 and the second divided case body 32 have the same shape and the same size as each other as shown in FIG. 3 in a state before connecting the 31 and 32 as described above. .
- each connecting member 15 in the tire circumferential direction of each of the first divided case body 31 and the second divided case body 32 is line-symmetric as described above in the tire side view.
- the outer casings 13 of the first split case body 31 and the second split case body 32 are in a state where the directions of the tire width direction H of the split case bodies 31 and 32 are opposite to each other.
- the non-pneumatic tire 1 can be obtained by connecting the end edges in the tire width direction H while abutting each other.
- first and second divided case bodies 31 and 32 are provided, for example, both end portions 21a, 22a, 21b, and 22b of the connecting member 15, the inner cylinder body 12 and the outer cylinder body 13 are connected to the fastening member.
- the weight can be reduced as compared with the case of connecting with the like.
- the bending elastic modulus of the synthetic resin material that integrally forms the ring member 14 and the plurality of connecting members 15 is set in the above range, the necessary and sufficient strength for the non-pneumatic tire 1 is ensured. Can be prepared.
- the above-mentioned bending elastic modulus of this synthetic resin material is 12000 MPa or less, comfortable riding comfort can be provided.
- the above-mentioned deflection temperature under load of this synthetic resin material is set to the above-mentioned range, it can prevent softening by outside temperature. Furthermore, even when the vehicle with the non-pneumatic tire 1 is driven, even if the non-pneumatic tire 1 is repeatedly deformed by rotating at a high speed, the non-pneumatic tire 1 is greatly deformed to the extent that it cannot run due to softening due to heat. Can also be prevented. Further, a plurality of first elastic connecting plates 21 are arranged along the tire circumferential direction at a position in one tire width direction H, and the second elastic connecting plates 22 are arranged around the tire circumference at other tire width direction H positions. Since a plurality of the members are arranged along the direction, it is possible to prevent the adjacent connecting members 15 from interfering with each other in the tire circumferential direction, and it is possible to suppress the restriction on the number of the arranged members.
- one end 21 a connected to the outer cylinder 13 is located on one side in the tire circumferential direction with respect to the other end 21 b connected to the inner cylinder 12, and the second Of the elastic connecting plate 22, one end 22 a connected to the outer cylinder 13 is located on the other side in the tire circumferential direction with respect to the other end 22 b connected to the inner cylinder 12. Therefore, when an external force is applied to the non-pneumatic tire 1, the first elastic connecting plate 21 and the second elastic connecting plate 22 can be easily elastically deformed. To ensure good ride comfort.
- the first elastic connecting plate 21 and the second elastic connecting plate 22 are arranged between the outer cylindrical body 13 and the inner cylindrical body 12.
- the first and second divided case bodies 31 and 32 that have a simple structure and can be easily formed are formed, respectively.
- the whole is integrally formed. Therefore, the non-pneumatic tire 1 can be easily and reliably formed as compared with the case where a case body having a complicated structure is formed.
- this non-pneumatic tire 1 can be formed still more easily.
- the molten resin can be surely easily reached to every corner of the mold, and the mold structure is complicated. It becomes possible to suppress becoming. Therefore, the non-pneumatic tire 1 can be formed more easily and reliably.
- the connecting member 15 is formed symmetrically with respect to the virtual line L in the tire side view, the spring constant along one side in the tire circumferential direction and the other side of the non-pneumatic tire 1 are along. It becomes possible to suppress a difference between the spring constant and good maneuverability.
- the bending direction of the bending portions 21d to 21f in the first elastic connecting plate 21 and the bending direction of the bending portions 22d to 22f in the second elastic connecting plate 22 are not limited to the above embodiment, and may be changed as appropriate.
- the first elastic connecting plate 21 and the second elastic connecting plate 22 are each provided as the connecting member 15.
- the first connecting member 15 includes the first elastic connecting plate 21 and the second elastic connecting plate 22.
- a configuration may be adopted in which a plurality of elastic connecting plates 21 and a plurality of second elastic connecting plates 22 are provided with different positions in the tire width direction H.
- a plurality of connecting members 15 may be provided along the tire width direction H between the inner cylinder 12 and the outer cylinder 13.
- the other end portions 21b and 22b of the first elastic connecting plate 21 and the second elastic connecting plate 22 are, for example, sandwiched the axis O in the tire radial direction on the outer peripheral surface of the inner cylinder 12 instead of the embodiment. And may be connected to positions opposite to each other. Or you may connect with the position etc. which oppose each end part 21a, 22a of the 1st elastic connection board 21 and the 2nd elastic connection board 22 in a tire radial direction in the outer peripheral surface of the inner cylinder 12.
- the one end portions 21a and 22a of both the connecting plates 21 and 22 may be connected to the inner peripheral surface of the outer cylindrical body 13 at different positions in the tire circumferential direction.
- ring members 14 may be divided in the tire width direction H or may not be divided.
- only the inner cylindrical body 12 and the connecting member 15 of the ring member 14 may be integrally formed of a synthetic resin material, or only the outer cylindrical body 13 and the connecting member 15 of the ring member 14 are formed of a synthetic resin material. May be formed integrally.
- the ring member 14 and the plurality of connecting members are made of a synthetic resin material having a bending elastic modulus higher than 300 MPa and a deflection temperature under load of 0.455 MPa of 62 ° C. or more.
- Eight types of non-pneumatic tires in which the member 15 was integrally formed were formed.
- a ring member and a plurality of connecting members are made of a synthetic resin material having a flexural modulus of 300 MPa or less and a deflection temperature of load of 6255 ° C. or less at 0.455 MPa.
- Three types of non-pneumatic tires in which members were integrally formed were formed.
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Abstract
Description
本願は、2012年12月26日に日本に出願された特願2012-282662号に基づき優先権を主張し、その内容をここに援用する。
このような問題を解決するために、近年では、例えば下記特許文献1に示されるような、車軸に取り付けられる取り付け体と、前記取り付け体をタイヤ径方向の外側から囲むリング状体と、これらの取り付け体とリング状体との間にタイヤ周方向に沿って複数配設された連結部材と、を備える非空気入りタイヤが提案されている。
また、リング部材のうちの少なくとも一部及び複数の連結部材が一体に形成されていることから、例えば、連結部材の両端部と内筒体及び外筒体とを、締結部材等を用いて連結する場合と比べて重量を抑えることができる。
さらに、リング部材のうちの少なくとも一部及び複数の連結部材を一体に形成する合成樹脂材料の、前述の曲げ弾性率が上記の範囲に設定されているので、非空気入りタイヤに必要かつ十分な強度を確実に備えさせることができる。
また、この合成樹脂材料の前述の曲げ弾性率が12000MPa以下となっている場合には、快適な乗り心地性を備えさせることができる。
しかも、この合成樹脂材料の、前述の荷重たわみ温度が上記の範囲に設定されているので、外気温により軟化するのを防ぐことができる。さらに、この非空気入りタイヤの装着された車両の走行時に、非空気入りタイヤがたとえ高速で回転して繰り返し変形した場合にも、熱による軟化に起因して走行不能な程度まで大きく変形するのを防ぐこともできる。
また、第1弾性連結板のうち、外筒体に連結された一端部が、内筒体に連結された他端部よりもタイヤ周方向の一方側に位置し、第2弾性連結板のうち、外筒体に連結された一端部が、内筒体に連結された他端部よりもタイヤ周方向の他方側に位置している。そのため、この非空気入りタイヤに外力が作用したときに、第1弾性連結板及び第2弾性連結板を弾性変形させ易くすることが可能になり、この非空気入りタイヤに柔軟性を備えさせて良好な乗り心地性を確保できる。
このため、リング部材及び連結部材を形成するに際し、まず、構造が簡素で容易に形成できる第1、第2分割ケース体をそれぞれ形成する。これにより、リング部材及び連結部材の全体が一体に形成されて構造が複雑なケース体を形成する場合と比べて、この非空気入りタイヤを容易かつ確実に形成できる。
しかも、前述のように、各分割ケース体において、外筒体と内筒体との間には、両弾性連結板のうちの一方だけが配設されていることから、各分割ケース体を射出成形により一体に形成するに際し、溶融樹脂を、型の内部の隅々にまで確実に到達させ易くすることが可能になるとともに、型の構造が複雑になるのを抑えることも可能になり、この非空気入りタイヤをより一層容易かつ確実に形成できる。
この非空気入りタイヤ1は、図示されない車軸に取り付けられる取り付け体11と、取り付け体11に外装される内筒体12、及び内筒体12をタイヤ径方向の外側から囲む外筒体13を備えるリング部材14と、内筒体12と外筒体13との間にタイヤ周方向に沿って複数配設されるとともに、これらの両筒体12、13同士を相対的に弾性変位自在に連結する連結部材15と、外筒体13の外周面側にその全周にわたって配設されたトレッド部材16と、を備えている。
装着筒部17、外リング部18、及びリブ19は例えばアルミニウム合金等の金属材料で一体に形成されている。装着筒部17及び外リング部18はそれぞれ、円筒状に形成され前記軸線Oと同軸に配設されている。複数のリブ19は、周方向に同等の間隔をあけて配置されている。
なお、キー溝部18aを画成する壁面のうち、タイヤ周方向で互いに対向する一対の側壁面と底壁面とは直角をなしている。また、突条部12aの外表面のうち、内筒体12の内周面から立ち上がる一対の側壁面と、タイヤ径方向の内側を向く頂壁面と、は直角をなしている。突条部12a及びキー溝部18aのタイヤ周方向の大きさは互いに同等になっている。
なお、外リング部18において、タイヤ周方向で隣り合うキー溝部18a同士の間に位置する部分には、タイヤ径方向に貫通する肉抜き孔がタイヤ幅方向Hに間隔をあけて複数配置されてなる孔列18cが、タイヤ周方向に間隔をあけて複数形成されている。また、リブ19にも、タイヤ幅方向Hに貫通する肉抜き孔19aが形成されている。
連結部材15は、第1弾性連結板21が一のタイヤ幅方向Hに沿った所定の位置にタイヤ周方向に沿って複数配置され、かつ第2弾性連結板22が前記一のタイヤ幅方向Hに沿った所定の位置とは異なるタイヤ幅方向Hに沿った他の位置にタイヤ周方向に沿って複数配置されるように、タイヤ周方向に沿って複数(図示の例では60個)設けられている。
すなわち、複数の第1弾性連結板21は、タイヤ幅方向Hにおける同一の位置にタイヤ周方向に沿って複数配置されるとともに、複数の第2弾性連結板22は、第1弾性連結板21からタイヤ幅方向Hに離れた同一のタイヤ幅方向Hに沿った所定の位置にタイヤ周方向に沿って複数配置されている。
そして、タイヤ周方向で隣り合う第1弾性連結板21同士は互いに非接触とされ、タイヤ周方向で隣り合う第2弾性連結板22同士も互いに非接触となっている。さらに、タイヤ幅方向Hで隣り合う第1弾性連結板21及び第2弾性連結板22同士も互いに非接触となっている。
なお、第1弾性連結板21及び第2弾性連結板22それぞれの幅は互いに同等になっている。また、第1弾性連結板21及び第2弾性連結板22それぞれの厚さも互いに同等になっている。
また、1つの連結部材15における第1弾性連結板21及び第2弾性連結板22の各一端部21a、22aは、外筒体13の内周面において、タイヤ幅方向Hの位置を互いに異ならせて、タイヤ周方向における同一の位置に連結されている。
第2弾性連結板22に形成された複数の湾曲部22d~22fは、タイヤ周方向の一方側に向けて突となるように湾曲した第1湾曲部22dと、第1湾曲部22dと一端部22aとの間に位置しかつタイヤ周方向の他方側に向けて突となるように湾曲した第2湾曲部22eと、第1湾曲部22dと他端部22bとの間に位置しかつタイヤ周方向の他方側に向けて突となるように湾曲した第3湾曲部22fと、を有している。
図示の例では、第1湾曲部21d、22dは、第2湾曲部21e、22e及び第3湾曲部21f、22fよりも、前記タイヤ側面視の曲率半径が大きくなっている。なお、第1湾曲部21d、22dは、第1弾性連結板21及び第2弾性連結板22の前記延びる方向における中央部に配置されている。
また、両弾性連結板21、22それぞれにおいて、前述した延びる方向の中央部から前記一端部21a、22aにわたる一端側部分は、前記中央部から前記他端部21b、22bにわたる他端側部分よりも厚さが大きくなっている。これにより、連結部材15の重量の増大を抑えたり、連結部材15の柔軟性を確保したりしながら、第1、第2弾性連結板21、22において大きな負荷がかかり易い一端側部分の強度を高めることができる。なお、これらの一端側部分と他端側部分とは段差なく滑らかに連なっている。
前記曲げ弾性率が300MPa以上となることで、タイヤ材料として必要な曲げに対する耐久性を有することが出来るとともに、0.455MPaでの荷重たわみ温度が62℃以上となることで、タイヤとして使用した際の繰り返し変形による発熱に対しても耐久を保つことが出来る。
ここで、この合成樹脂材料の前述の荷重たわみ温度が62℃以上となっていることには、前述の荷重たわみ温度が160℃以下の温度範囲では測定されないことを含む。さらに、この合成樹脂材料は、ASTM D648に準拠して得られる1.82MPaでの荷重たわみ温度が60℃以上であっても同じ効果を発揮する。なお、前述の荷重たわみ温度を測定する際の試験方向をフラットワイズとしたが、エッジワイズとしてもよい。
さらに本実施形態では、リング部材14は、図1に示されるように、タイヤ幅方向Hの一方側に位置する一方側分割リング部材23と、タイヤ幅方向Hの他方側に位置する他方側分割リング部材24と、に分割されている。なお図示の例では、リング部材14はタイヤ幅方向Hの中央部で分割されている。
さらに本実施形態では、一方側分割リング部材23及び第1弾性連結板21、並びに他方側分割リング部材24及び第2弾性連結板22はそれぞれ、射出成形により一体に形成されている。
以下、一方側分割リング部材23及び第1弾性連結板21が一体に形成されたものを第1分割ケース体31といい、他方側分割リング部材24及び第2弾性連結板22が一体に形成されたものを第2分割ケース体32という。
また、第1、第2分割ケース体31、32それぞれにおいて、一方側、他方側分割リング部材23、24と、第1、第2弾性連結板21、22と、は、互いに異なる材質で形成してもよいし、同一の材質で形成してもよい。
なお、第1、第2分割ケース体31、32それぞれ全体を同時に射出成形する場合には、内筒体12に形成された複数の突条部12aをゲート部分としてもよい。
また、一方側分割リング部材23の内筒体12、及び他方側分割リング部材24の内筒体12それぞれのタイヤ幅方向Hの端縁同士は、タイヤ幅方向Hに離れている。これにより、取り付け体11に外嵌される内筒体12の内周面にバリが生ずることが防止されている。
そして、前述のように連結するに際し、各連結部材15が前記タイヤ側面視で前述のように線対称となるように、第1分割ケース体31及び第2分割ケース体32それぞれのタイヤ周方向の位置を合わせつつ、これらの両分割ケース体31、32のタイヤ幅方向Hの向きを互いに逆向きにした状態で、第1分割ケース体31及び第2分割ケース体32の各外筒体13のタイヤ幅方向Hの端縁同士を突き合わせて連結することにより、非空気入りタイヤ1が得られる。
さらに、リング部材14及び複数の連結部材15を一体に形成する合成樹脂材料の、前述の曲げ弾性率が上記の範囲に設定されているので、非空気入りタイヤ1に必要かつ十分な強度を確実に備えさせることができる。
また、この合成樹脂材料の前述の曲げ弾性率が12000MPa以下となっている場合には、快適な乗り心地性を備えさせることができる。
しかも、この合成樹脂材料の、前述の荷重たわみ温度が上記の範囲に設定されているので、外気温により軟化するのを防ぐことができる。さらに、この非空気入りタイヤ1の装着された車両の走行時に、非空気入りタイヤ1がたとえ高速で回転して繰り返し変形した場合にも、熱による軟化に起因して走行不能な程度まで大きく変形するのを防ぐこともできる。
さらに、第1弾性連結板21が、一のタイヤ幅方向Hの位置にタイヤ周方向に沿って複数配置されるとともに、第2弾性連結板22が、他のタイヤ幅方向Hの位置にタイヤ周方向に沿って複数配置されているので、タイヤ周方向で隣り合う連結部材15同士が干渉し合うのを抑えることが可能になり、その配設個数に制限が生ずるのを抑制できる。
しかも、前述のように、各分割ケース体31、32において、外筒体13と内筒体12との間には、両弾性連結板21、22のうちの一方だけが配設されている。これにより、各分割ケース体31、32を射出成形により一体に形成するに際し、溶融樹脂を、型の内部の隅々にまで確実に到達させ易くすることが可能になるとともに、型の構造が複雑になるのを抑えることも可能になる。したがって、この非空気入りタイヤ1をより一層容易かつ確実に形成できる。
また、前記実施形態では、連結部材15として第1弾性連結板21及び第2弾性連結板22をそれぞれ1つずつ備えた構成を示したが、これに代えて、1つの連結部材15に第1弾性連結板21及び第2弾性連結板22がそれぞれ複数ずつ、互いのタイヤ幅方向Hの位置を異ならせて備えられた構成を採用してもよい。
また、連結部材15を、内筒体12と外筒体13との間にタイヤ幅方向Hに沿って複数設けてもよい。
また、前記実施形態に代えて、両連結板21、22の各一端部21a、22aを、外筒体13の内周面にタイヤ周方向位置を互いに異ならせて連結してもよい。
また、リング部材14をタイヤ幅方向Hに3個以上分割してもよいし、分割しなくてもよい。
さらに、リング部材14のうち内筒体12のみと連結部材15とを合成樹脂材料で一体に形成してもよいし、リング部材14のうち外筒体13のみと連結部材15とを合成樹脂材料で一体に形成してもよい。
実施例として、表1に示されるように、前述の曲げ弾性率が300MPaより高く、かつ0.455MPaでの前述の荷重たわみ温度が62℃以上の合成樹脂材料により、リング部材14及び複数の連結部材15が一体に形成された8種類の非空気入りタイヤをそれぞれ形成した。比較例として、表2に示されるように、前述の曲げ弾性率が300MPa以下であり、かつ0.455MPaでの前述の荷重たわみ温度が62℃以下の合成樹脂材料により、リング部材及び複数の連結部材が一体に形成された3種類の非空気入りタイヤをそれぞれ形成した。
そして、これら11種類の非空気入りタイヤに対して、23℃の雰囲気温度下、及び40℃の雰囲気温度下でそれぞれ、タイヤ径方向に3000kNの圧縮力を加えたときに破損したか否か、または、タイヤ径方向に20mm圧縮変形させたときに破損したか否かを確認した。
その結果、実施例の非空気入りタイヤでは全てについて、23℃及び40℃双方の雰囲気温度下で、破損した箇所がなく、比較例の非空気入りタイヤでは全てについて、40℃の雰囲気温度下で破損した箇所が確認された。また、23℃の雰囲気温度下では、前述の曲げ弾性率が300MPaである比較例3の非空気入りタイヤには破損個所が確認されず、前述の曲げ弾性率が300MPa未満である比較例1、2の非空気入りタイヤには破損個所が確認された。
11 取り付け体
12 内筒体
13 外筒体
14 リング部材
15 連結部材
21 第1弾性連結板
22 第2弾性連結板
21a、22a 一端部
21b、22b 他端部
23 一方側分割リング部材
24 他方側分割リング部材
H タイヤ幅方向
L 仮想線
O 軸線
Claims (7)
- 車軸に取り付けられる取り付け体と、
前記取り付け体に外装される内筒体、及び前記内筒体をタイヤ径方向の外側から囲む外筒体を備えるリング部材と、
前記内筒体と前記外筒体との間にタイヤ周方向に沿って複数配設されるとともに、これらの両筒体同士を連結する連結部材と、を備え、
前記リング部材のうちの少なくとも一部及び複数の前記連結部材は、ISO 178に準拠した3点曲げ試験で得られる曲げ弾性率が300MPaより高く、かつASTM D648に準拠して得られる0.455MPaでの荷重たわみ温度が62℃以上の合成樹脂材料で一体に形成されている非空気入りタイヤ。 - 前記連結部材は、前記両筒体同士を連結する第1弾性連結板及び第2弾性連結板を備え、
前記第1弾性連結板のうち、前記外筒体に連結された一端部は、前記内筒体に連結された他端部よりもタイヤ周方向の一方側に位置し、
前記第2弾性連結板のうち、前記外筒体に連結された一端部は、前記内筒体に連結された他端部よりもタイヤ周方向の他方側に位置し、
前記第1弾性連結板は、一のタイヤ幅方向位置にタイヤ周方向に沿って複数配置されるとともに、前記第2弾性連結板は、前記一のタイヤ幅方向位置とは異なる他のタイヤ幅方向位置にタイヤ周方向に沿って複数配置されている請求項1に記載の非空気入りタイヤ。 - 前記リング部材は、タイヤ幅方向の一方側に位置する一方側分割リング部材と、タイヤ幅方向の他方側に位置する他方側分割リング部材と、に分割され、
前記一方側分割リング部材は、前記第1弾性連結板と一体に形成され、
前記他方側分割リング部材は、前記第2弾性連結板と一体に形成されている請求項2に記載の非空気入りタイヤ。 -
前記一方側分割リング部材及び第1弾性連結板、並びに前記他方側分割リング部材及び第2弾性連結板はそれぞれ、射出成形により一体に形成されている請求項3に記載の非空気入りタイヤ。 - 1つの前記連結部材における第1弾性連結板及び第2弾性連結板の各一端部は、前記外筒体の内周面において、タイヤ幅方向の位置を互いに異ならせて、タイヤ周方向における同一の位置に連結され、
前記連結部材は、このタイヤをタイヤ幅方向から見たタイヤ側面視で、タイヤ径方向に沿って延び、かつ前記各一端部を通る仮想線に対して線対称に形成されている請求項2に記載の非空気入りタイヤ。 - 1つの前記連結部材における第1弾性連結板及び第2弾性連結板の各一端部は、前記外筒体の内周面において、タイヤ幅方向の位置を互いに異ならせて、タイヤ周方向における同一の位置に連結され、
前記連結部材は、このタイヤをタイヤ幅方向から見たタイヤ側面視で、タイヤ径方向に沿って延び、かつ前記各一端部を通る仮想線に対して線対称に形成されている請求項3に記載の非空気入りタイヤ。 - 1つの前記連結部材における第1弾性連結板及び第2弾性連結板の各一端部は、前記外筒体の内周面において、タイヤ幅方向の位置を互いに異ならせて、タイヤ周方向における同一の位置に連結され、
前記連結部材は、このタイヤをタイヤ幅方向から見たタイヤ側面視で、タイヤ径方向に沿って延び、かつ前記各一端部を通る仮想線に対して線対称に形成されている請求項4に記載の非空気入りタイヤ。
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Publication number | Priority date | Publication date | Assignee | Title |
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JP5879089B2 (ja) * | 2011-10-20 | 2016-03-08 | 株式会社ブリヂストン | 非空気入りタイヤの製造方法 |
JP6051037B2 (ja) * | 2012-12-26 | 2016-12-21 | 株式会社ブリヂストン | 非空気入りタイヤ |
CN104797435B (zh) * | 2012-12-26 | 2018-05-15 | 株式会社普利司通 | 非充气轮胎 |
CA2915483C (en) | 2013-06-15 | 2021-11-16 | Ronald Thompson | Annular ring and non-pneumatic tire |
EP3253591B1 (en) | 2015-02-04 | 2021-06-30 | Camso Inc. | Non-pneumatic tire and other annular devices |
WO2017106750A1 (en) | 2015-12-16 | 2017-06-22 | Thompson Ronald H | Track system for traction of a vehicle |
JP6605945B2 (ja) * | 2015-12-21 | 2019-11-13 | 株式会社ブリヂストン | 非空気入りタイヤ |
KR101789407B1 (ko) * | 2016-02-26 | 2017-10-23 | 엘지전자 주식회사 | 로봇 청소기 및 바퀴 어셈블리 |
CA3067053A1 (en) | 2017-06-15 | 2018-12-20 | Camso Inc. | Wheel comprising a non-pneumatic tire |
CN111051079B (zh) * | 2017-07-06 | 2023-06-09 | 米其林集团总公司 | 具有聚酰胺轮辐的非充气轮 |
EP3708386B1 (en) * | 2017-11-10 | 2023-06-07 | Bridgestone Corporation | Nonpneumatic tire |
EP3724001B1 (en) | 2017-12-14 | 2023-11-22 | Bridgestone Americas Tire Operations, LLC | Non-pneumatic tire with multi-piece web |
EP4253085A3 (en) | 2018-07-27 | 2023-11-01 | Bridgestone Americas Tire Operations, LLC | Reusable rim for non-pneumatic tires |
CN109094295B (zh) * | 2018-09-29 | 2020-03-24 | 北京力升高科科技有限公司 | 一种耐高温车轮 |
US20230331035A1 (en) * | 2022-04-13 | 2023-10-19 | Rev Robotics Llc | Apertured article, insertion article and associated systems |
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JPH02182501A (ja) * | 1988-07-27 | 1990-07-17 | Sumitomo Rubber Ind Ltd | 非空気入りタイヤ |
JP2009286208A (ja) * | 2008-05-28 | 2009-12-10 | Yokohama Rubber Co Ltd:The | 非空気式タイヤ |
JP2011156905A (ja) | 2010-01-29 | 2011-08-18 | Bridgestone Corp | 非空気入りタイヤ |
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US3219090A (en) * | 1963-09-04 | 1965-11-23 | Air Flex Corp | Wheel |
CA1034855A (en) * | 1975-01-11 | 1978-07-18 | Peter G. Ware | Resilient support means such as a wheel or tyre |
JPH0195905A (ja) | 1987-10-08 | 1989-04-14 | Sumitomo Rubber Ind Ltd | 注型タイヤ |
JPH0569062U (ja) * | 1992-02-19 | 1993-09-17 | 株式会社明電舎 | 低騒音車輪 |
JP4990882B2 (ja) | 2005-04-29 | 2012-08-01 | ビッグ タイア プロプライエタリー リミテッド | 非空気圧式ホイールアセンブリ |
JP5214198B2 (ja) * | 2007-09-05 | 2013-06-19 | 株式会社ブリヂストン | 非空気入りタイヤ |
JP5401129B2 (ja) * | 2009-03-11 | 2014-01-29 | 株式会社ブリヂストン | 非空気入りタイヤ |
JP5548540B2 (ja) | 2010-07-05 | 2014-07-16 | 株式会社ブリヂストン | 非空気入りタイヤ |
JP5879089B2 (ja) * | 2011-10-20 | 2016-03-08 | 株式会社ブリヂストン | 非空気入りタイヤの製造方法 |
-
2013
- 2013-12-09 JP JP2014554286A patent/JP6293060B2/ja not_active Expired - Fee Related
- 2013-12-09 US US14/433,546 patent/US9623702B2/en not_active Expired - Fee Related
- 2013-12-09 CN CN201380060632.0A patent/CN104797433B/zh not_active Expired - Fee Related
- 2013-12-09 WO PCT/JP2013/082958 patent/WO2014103680A1/ja active Application Filing
- 2013-12-09 EP EP13869746.1A patent/EP2896510B1/en not_active Not-in-force
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH02182501A (ja) * | 1988-07-27 | 1990-07-17 | Sumitomo Rubber Ind Ltd | 非空気入りタイヤ |
JP2009286208A (ja) * | 2008-05-28 | 2009-12-10 | Yokohama Rubber Co Ltd:The | 非空気式タイヤ |
JP2011156905A (ja) | 2010-01-29 | 2011-08-18 | Bridgestone Corp | 非空気入りタイヤ |
Also Published As
Publication number | Publication date |
---|---|
JP6293060B2 (ja) | 2018-03-14 |
CN104797433A (zh) | 2015-07-22 |
CN104797433B (zh) | 2017-09-12 |
EP2896510A1 (en) | 2015-07-22 |
JPWO2014103680A1 (ja) | 2017-01-12 |
US9623702B2 (en) | 2017-04-18 |
EP2896510B1 (en) | 2018-05-30 |
EP2896510A4 (en) | 2017-04-05 |
US20150273935A1 (en) | 2015-10-01 |
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