WO2017061405A1 - 非空気入りタイヤ - Google Patents
非空気入りタイヤ Download PDFInfo
- Publication number
- WO2017061405A1 WO2017061405A1 PCT/JP2016/079405 JP2016079405W WO2017061405A1 WO 2017061405 A1 WO2017061405 A1 WO 2017061405A1 JP 2016079405 W JP2016079405 W JP 2016079405W WO 2017061405 A1 WO2017061405 A1 WO 2017061405A1
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- WIPO (PCT)
- Prior art keywords
- point
- tire
- straight line
- connecting member
- inclination angle
- Prior art date
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Classifications
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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
- B60C7/146—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs extending substantially radially, e.g. like spokes
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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
- 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
- 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
- B60C7/143—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs having a lateral extension disposed in a plane parallel to the wheel axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2200/00—Type of product being used or applied
- B60B2200/20—Furniture or medical appliances
- B60B2200/22—Chairs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/30—Increase in
- B60B2900/321—Lifetime
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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
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. 2015-201279 for which it applied to Japan on October 9, 2015, and uses the content here.
- an attachment body attached to an axle, an outer cylinder body that surrounds the attachment body from the outside in the tire radial direction, and an outer cylinder body There has been proposed a non-pneumatic tire including a connecting body that connects the mounting body and the mounting body.
- a plurality of the connecting bodies are arranged at intervals in the tire circumferential direction, and both end portions thereof are respectively connected to the attachment body and the outer cylindrical body, and one end portion which is an outer end portion in the tire radial direction is in the tire radial direction.
- a connecting member is provided which is located on one side in the tire circumferential direction from the other end which is an inner end.
- the present invention has been made in view of the above-described circumstances, and an object thereof is to improve durability.
- a non-pneumatic tire according to the present invention includes an attachment body attached to an axle, an outer cylinder body that surrounds the attachment body from an outer side in a tire radial direction, and a connection body that connects the outer cylinder body and the attachment body.
- the connecting body is arranged with a plurality in the tire circumferential direction at intervals, and both ends are connected to the mounting body and the outer cylinder body, respectively, and are one end that is an outer end portion in the tire radial direction.
- a first point, a second point, a third point, a fourth point, and a fifth point are set, and the first point is set on an edge of the connecting member on the one end side, From the fifth point to the second point, which is set on the edge on the other end side of the connecting member and along a reference straight line passing through the first point and the tire axis.
- the distance H1 is 0.80 times the reference distance H from the fifth point to the first point
- the distance H2 from the fifth point to the third point is 0.65 times the reference distance H.
- the third point passes through the first point and the fifth point.
- An orthogonal direction that is arranged on the other side in the tire circumferential direction with respect to the entire inclined straight line and is orthogonal to the reference straight line between the second point and the third point.
- FIG. 1 is a side view of a non-pneumatic tire according to an embodiment of the present invention. It is the side view to which the principal part of the non-pneumatic tire shown in FIG. 1 was expanded, Comprising: It is the figure in which the reference distance between each point was described. It is the side view to which the principal part of the non-pneumatic tire shown in FIG. 1 was expanded, Comprising: It is the figure in which the inclination angle regarding each point was described.
- the non-pneumatic tire 1 of the present embodiment includes an attachment body 11 attached to an axle (not shown), and a cylindrical outer cylinder body that surrounds the attachment body 11 from the outside in the tire radial direction. 13, a connecting body 14 that connects the attachment body 11 and the outer cylinder body 13, and a cylindrical tread member 16 that is externally mounted on the outer cylinder body 13.
- the non-pneumatic tire 1 of the present embodiment may be employed in a small vehicle that travels at a low speed, such as a handle-type electric wheelchair defined in Japanese Industrial Standard JIS T 9208. Further, the size of the non-pneumatic tire 1 is not particularly limited, but may be 3.00-8, for example. Moreover, you may employ
- the mounting body 11, the outer cylinder body 13, and the tread member 16 described above are 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
- 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 center part of the tire width direction in each of the attachment body 11, the outer cylinder body 13, and the tread member 16 is mutually matched.
- the attachment body 11 connects the mounting cylinder part 17 to which the front end of the axle is mounted, the outer ring part 18 surrounding the mounting cylinder part 17 from the outside in the tire radial direction, and the mounting cylinder part 17 and the outer ring part 18. And a plurality of ribs 19.
- the mounting cylinder part 17, the outer ring part 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 are arranged coaxially with the axis O.
- the plurality of ribs 19 are arranged, for example, at equal intervals in the tire circumferential direction.
- a plurality of key groove portions that are recessed toward the inside in the tire radial direction and that extend in the tire width direction are formed at intervals in the tire circumferential direction.
- the key groove portion is open only on one side in the tire width direction (outside the vehicle body) on the outer peripheral surface of the outer ring portion 18, and is closed on the other side in the tire width direction (inside the vehicle body).
- the attachment body 11 is provided with a cylindrical inner cylinder body 12 fitted to the outer ring portion 18 from the outside.
- a protrusion (not shown) that protrudes inward in the tire radial direction and extends over the entire length in the tire width direction is formed.
- a plurality of the protruding portions are formed on the inner peripheral surface of the inner cylindrical body 12 at intervals in the tire circumferential direction, and are respectively fitted to the key groove portions.
- the inner cylinder 12 is being fixed to the attachment body 11 in the state by which the said protrusion part was fitted by the said key groove part.
- the inner cylinder 12 is fixed to the attachment body 11 by screwing a plate material 28 from one side in the tire width direction to a position corresponding to the key groove portion in the outer ring portion 18.
- a plurality of connecting bodies 14 are disposed along the tire circumferential direction between the attachment body 11 and the outer cylinder body 13, and are connected to connect the attachment body 11 and the outer cylinder body 13 so as to be relatively elastically displaceable.
- a member 15 is provided.
- a plurality of connecting members 15 are arranged at intervals in the tire circumferential direction, and both end portions are respectively connected to the attachment body 11 and the outer cylindrical body 13, and one end portion (outer end portion) that is an outer end portion in the tire radial direction.
- 15a) is located on one side in the tire circumferential direction from the other end which is the inner end (inner end 15b) in the tire radial direction.
- the connecting member 15 gradually extends toward the other side in the tire circumferential direction from the outer side in the tire radial direction toward the inner side.
- the connecting member 15 connects the outer peripheral surface side of the mounting body 11 and the inner peripheral surface side of the outer cylindrical body 13 so as to be relatively elastically displaceable.
- the connecting member 15 is an elastically deformable plate material whose front and back surfaces face the tire circumferential direction.
- a plurality of connecting members 15 are arranged along the tire circumferential direction.
- the plurality of connecting members 15 are disposed between the inner cylinder 12 and the outer cylinder 13 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, and the lateral width of the connecting member 15 along the tire width direction is smaller than the lateral width of the outer cylinder 13 along the tire width direction.
- the connecting members 15 adjacent in the tire circumferential direction are not in contact with each other.
- one end portion (outer end portion 15 a) of the connecting member 15 connected to the outer cylindrical body 13 is the other end portion (inner end portion 15 b) connected to the inner cylindrical body 12.
- the connecting member 15 has a plurality of curved portions 15d to 15f that are curved in the tire circumferential direction at an intermediate portion located between the outer end portion 15a and the inner end portion 15b.
- the plurality of curved portions 15d to 15f are formed along the extending direction in which the connecting member 15 extends in a side view of the tire when the non-pneumatic tire 1 is viewed from the tire width direction.
- the plurality of bending portions 15d to 15f in the connecting member 15 are adjacent to each other in the extending direction, and the bending directions are opposite to each other.
- the plurality of curved portions 15d to 15f are located between the first curved portion 15d curved so as to protrude toward the other side in the tire circumferential direction, the first curved portion 15d, and the outer end portion 15a, and Positioned between the second curved portion 15e curved so as to project toward one side in the tire circumferential direction, the first curved portion 15d and the inner end portion 15b, and toward one side in the tire circumferential direction A third bending portion 15f that is curved so as to project.
- the connecting member 15 is formed with inflection portions 15g and 15h at portions located between the curved portions 15d to 15f adjacent to each other in the extending direction of the connecting member 15.
- the inner cylindrical body 12, the outer cylindrical body 13, and the plurality of connecting members 15 (connecting bodies 14) described above are integrally formed of, for example, a synthetic resin material.
- the synthetic resin material may be, for example, only one type of resin material, a mixture containing two or more types of resin materials, or a mixture containing one or more types of resin materials and one or more types of elastomers. You may contain additives, such as an anti-aging agent, a plasticizer, a filler, or a pigment.
- a unit in which the inner cylinder 12, the outer cylinder 13, and the connecting member 15 are integrally formed is referred to as a case body 31.
- the case body 31 can be integrally formed by, for example, injection molding.
- the injection molding may be a general method in which the entire case body 31 is molded at the same time, or a part of the inner cylindrical body 12, the outer cylindrical body 13 and the connecting member 15 is used as an insert. It may be insert molding for injection molding or so-called two-color molding.
- the inner cylinder 12, the outer cylinder 13, and the connecting member 15 may be formed of different materials or may be formed of the same material. Examples of the material include a metal material and a resin material, but a resin material, particularly a thermoplastic resin is preferable from the viewpoint of weight reduction.
- the tread member 16 is formed in a cylindrical shape, and integrally covers the outer peripheral surface side of the outer cylindrical body 13 over the entire region.
- the inner peripheral surface of the tread member 16 is in close contact with the outer peripheral surface of the outer cylinder 13 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.
- thermoplastic elastomer examples 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. ), Urethane-based thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), or other thermoplastic elastomer (TPZ).
- 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 non-pneumatic tire 1 satisfies the relationship shown below. That is, first, as shown in FIG. 2 and FIG. 3, the connecting member 15 extends over the entire length from the outer end portion 15 a to the inner end portion 15 b of the non-pneumatic tire 1 when viewed from the tire width direction.
- the first point P1, the second point P2, the third point P3, and the fourth point P4 in order from the outer end 15a side to the inner end 15b side on the center line CL passing through the center in the tire circumferential direction.
- the 5th point P5 is set.
- the first point P1 is set on the edge on the outer end 15a side of the connecting member 15, and the fifth point P5 is set to the inner end of the connecting member 15. It is set on the edge on the 15b side.
- the end edge on the outer end 15 a side of the connecting member 15 is located on the inner peripheral surface of the outer cylinder 13, and the end edge on the inner end 15 b side of the connecting member 15 is the outer peripheral surface of the inner cylinder 12. Located on the top. Further, the distance between the first point P1 and the fifth point P5 along the reference straight line RL passing through the first point P1 and the axis O (tire axis) is assumed to be H.
- the reference straight line RL extends in the tangential direction of the portion of the inner peripheral surface of the outer cylindrical body 13 where the first point P1 is located. Then, the distance H1 from the fifth point P5 to the second point P2 along the reference straight line RL is set to 0.80 times the reference distance H, and the distance H2 from the fifth point P5 to the third point is set to the reference distance. The distance H3 from the fifth point P5 to the fourth point P4 is set to 0.30 times the reference distance H at 0.65 times H.
- the third point P3 is disposed on the other side in the tire circumferential direction with respect to the entire inclined straight line SL passing through the first point P1 and the fifth point P5.
- the horizontal distance D2 along the orthogonal direction D orthogonal to the reference straight line RL between the second point P2 and the third point P3 is in the orthogonal direction D between the first point P1 and the second point P2.
- the horizontal distance D1 along and the horizontal distance D4 along the orthogonal direction D between the fourth point P4 and the fifth point P5 are larger.
- the horizontal distance D3 along the orthogonal direction D between the third point P3 and the fourth point P4 is larger than the horizontal distance D1 and the horizontal distance D4.
- the second point P2 is arranged on one side in the tire circumferential direction with respect to the entire inclined straight line SL passing through the first point P1 and the fifth point P5. Further, the second inclined straight line SL2 passing through the second point P2 and the third point P3 intersects with the entire inclined straight line SL. That is, when the portion where the third point P3 is located projects to the other side in the tire circumferential direction, the portion where the second point P2 is located projects to one side in the tire circumferential direction.
- the inclination angle ⁇ 2 with respect to the orthogonal direction D of the second inclined straight line SL2 passing through the second point P2 and the third point P3 is the first inclined straight line passing through the first point P1 and the second point P2.
- the inclination angle ⁇ 1 with respect to the orthogonal direction D of SL1 is smaller than the inclination angle ⁇ 4 with respect to the orthogonal direction D of the fourth inclined straight line SL4 passing through the fourth point P4 and the fifth point P5.
- the inclination angle ⁇ 3 with respect to the orthogonal direction D of the third inclination straight line SL3 passing through the third point P3 and the fourth point P4 is larger than the inclination angle ⁇ 2, and the inclination angle ⁇ 4 is larger than the inclination angle ⁇ 3.
- size along the tire peripheral direction of the connection member 15 becomes small gradually (thinner) gradually toward the 4th point P4 from each of the 1st point P1 and the 5th point P5.
- the inclination angle ⁇ and the inclination angle ⁇ 3 with respect to the orthogonal direction D of the overall inclination straight line SL satisfy the relationship of the following expression (1). 0.9 ⁇ ( ⁇ 3 / ⁇ ) ⁇ 1.2 (1) Furthermore, in the present embodiment, the inclination angles ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 satisfy the relationship of the following equations (2) to (5).
- the inclination angles ⁇ , ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 preferably satisfy the following relationships (1) ′ to (5) ′.
- the third point P3 is disposed on the other side in the tire circumferential direction with respect to the entire inclined straight line SL.
- the portion where the third point P3 is located can be projected to the other side in the tire circumferential direction.
- the horizontal distance D2 between the second point P2 and the third point P3 is the horizontal distance D1 between the first point P1 and the second point P2, and between the fourth point P4 and the fifth point P5. Therefore, the portion of the connecting member 15 located between the second point P2 and the third point P3 can be greatly laid down with respect to the reference straight line RL.
- the inclination angle ⁇ 2 of the second inclination straight line SL2 is smaller than the inclination angle ⁇ 1 of the first inclination straight line SL1 and the inclination angle ⁇ 4 of the fourth inclination straight line SL4. Therefore, the part located between the 2nd point P2 and the 3rd point P3 among the connection members 15 can be laid down largely reliably with respect to the reference straight line RL. Further, since the inclination angle ⁇ 3 of the third inclination straight line SL3 is larger than the inclination angle ⁇ 2 of the second inclination straight line SL2, the central portion of the connecting member 15 protrudes toward the other side in the tire circumferential direction in a tire side view. It can be formed so that it can be easily bent and deformed.
- the connecting member 15 located between the fourth point P4 and the fifth point P5 is selected. It is possible to stand up compared to the portion located between the second point P2 and the third point P3. Thereby, the deformation
- the inner cylindrical body 12, the outer cylindrical body 13, and the connecting member 15 are integrally formed by, for example, injection molding.
- the present invention is not limited to injection molding, and may be integrally formed by, for example, casting.
- attachment The connecting member 15 may be directly connected to the outer ring portion 18 of the body 11. In this case, the end edge on the inner end 15b side of the connecting member 15 is located on the outer peripheral surface of the outer ring portion 18, and the fifth point P5 can be set on the outer peripheral surface of the outer ring portion 18. is there.
- the non-pneumatic tires of the comparative example and the example are based on the non-pneumatic tire shown in FIG. 1, and the values of the inclination angles ⁇ 1 to ⁇ 4, ⁇ and the horizontal distances D1 to D4 are shown in the following table. Each value shown in 1 was set. In Table 1, the unit of each value of the inclination angles ⁇ 1 to ⁇ 4, ⁇ is “degree (°)”, and the unit of each value of the horizontal distances D1 to D4 is “millimeter (mm)”.
- the horizontal distance D2 is larger than the horizontal distances D1 and D4, the inclination angle ⁇ 2 is smaller than the inclination angles ⁇ 1 and ⁇ 4, and the inclination The angle ⁇ 3 is larger than the inclination angle ⁇ 2, and the inclination angle ⁇ 4 is larger than the inclination angle ⁇ 3.
- the horizontal distance D2 is smaller than the horizontal distances D1 and D4, the inclination angle ⁇ 2 is larger than the inclination angles ⁇ 1 and ⁇ 4, and the inclination angle ⁇ 3 is smaller than the inclination angle ⁇ 2.
- the inclination angle ⁇ 4 is smaller than the inclination angle ⁇ 3.
- the portion of the connecting member where the third point is located is on the other side in the tire circumferential direction. Can be overhanged.
- the horizontal distance D2 between the second point and the third point is greater than the horizontal distance D1 between the first point and the second point and the horizontal distance D4 between the fourth point and the fifth point. Since it is large, the part located between the 2nd point and the 3rd point among connecting members can be greatly laid down with respect to a standard straight line.
- An inclination angle ⁇ 2 with respect to the orthogonal direction of the second inclined straight line passing through the second point and the third point is an inclination angle ⁇ 1 with respect to the orthogonal direction of the first inclined straight line passing through the first point and the second point
- the inclination angle ⁇ 4 with respect to the orthogonal direction of the fourth inclined straight line passing through the fourth point and the fifth point may be smaller.
- the inclination angle ⁇ 2 of the second inclination straight line is smaller than the inclination angle ⁇ 1 of the first inclination straight line and the inclination angle ⁇ 4 of the fourth inclination straight line. Therefore, the part located between the 2nd point and the 3rd point among connecting members can be surely laid down largely with respect to a standard straight line.
- the inclination angle ⁇ 3 with respect to the orthogonal direction of the third inclination straight line passing through the third point and the fourth point may be larger than the inclination angle ⁇ 2.
- the central portion of the connecting member protrudes toward the other side in the tire circumferential direction in a tire side view. It can be made easy to bend and deform.
- the inclination angle ⁇ 4 may be larger than the inclination angle ⁇ 3.
- the size of the connecting member along the tire circumferential direction may gradually decrease from the first point and the fifth point toward the fourth point.
- the durability of a non-pneumatic tire can be improved.
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Abstract
Description
本願は、2015年10月9日に日本に出願された特願2015-201279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、取り付け体をタイヤ径方向の外側から囲繞する外筒体と、外筒体と取り付け体とを連結する連結体と、を備える非空気入りタイヤが提案されている。前記連結体には、タイヤ周方向に間隔をあけて複数配置されるとともに両端部が取り付け体および外筒体にそれぞれ連結され、タイヤ径方向の外側の端部である一端部がタイヤ径方向の内側の端部である他端部よりもタイヤ周方向の一方側に位置する連結部材が備えられている。
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、軸線Oと同軸に配設されている。複数のリブ19は、例えばタイヤ周方向に同等の間隔をあけて配置されている。
そして、内筒体12は、前記突条部が前記キー溝部に嵌合された状態で、取り付け体11に固定されている。図示の例では、外リング部18において前記キー溝部と対応する位置に、タイヤ幅方向の一方側から板材28が螺合されることにより、内筒体12が取り付け体11に固定されている。
連結部材15には、外端部15aと内端部15bとの間に位置する中間部分に、タイヤ周方向に湾曲する湾曲部15d~15fが複数形成されている。これら複数の湾曲部15d~15fは、非空気入りタイヤ1をタイヤ幅方向から見たタイヤ側面視で、連結部材15が延びる延在方向に沿って形成されている。図示の例では、連結部材15における複数の湾曲部15d~15fは、上記延在方向で互いに隣り合うとともに、湾曲方向が互いに逆向きである。
以下、内筒体12、外筒体13、及び連結部材15が一体に形成されたユニットをケース体31という。
熱可塑性材料として、例えば熱可塑性エラストマー若しくは熱可塑性樹脂等が挙げられる。熱可塑性エラストマーとしては、例えば日本工業規格JIS K6418に規定されるアミド系熱可塑性エラストマー(TPA)、エステル系熱可塑性エラストマー(TPC)、オレフィン系熱可塑性エラストマー(TPO)、スチレン系熱可塑性エラストマー(TPS)、ウレタン系熱可塑性エラストマー(TPU)、熱可塑性ゴム架橋体(TPV)、若しくはその他の熱可塑性エラストマー(TPZ)等が挙げられる。
熱可塑性樹脂としては、例えばウレタン樹脂、オレフィン樹脂、塩化ビニル樹脂、若しくはポリアミド樹脂等が挙げられる。なお、耐摩耗性の観点ではトレッド部材16を加硫ゴムで形成するのが好ましい。
すなわち、まず図2および図3に示すような、この非空気入りタイヤ1をタイヤ幅方向から見たタイヤ側面視で、連結部材15において外端部15aから内端部15bに至る全長にわたって連結部材15のタイヤ周方向の中心を通る中心線CL上に、外端部15a側から内端部15b側に向けて順に、第1点P1、第2点P2、第3点P3、第4点P4および第5点P5を設定する。これらの第1点P1から第5点P5のうち、第1点P1を、連結部材15における外端部15a側の端縁上に設定し、第5点P5を、連結部材15における内端部15b側の端縁上に設定する。なお、連結部材15における外端部15a側の端縁は、外筒体13の内周面上に位置し、連結部材15における内端部15b側の端縁は、内筒体12の外周面上に位置する。また、第1点P1と軸線O(タイヤ軸)とを通る基準直線RLに沿った、第1点P1と第5点P5との間の距離をHとする。なお基準直線RLは、外筒体13の内周面のうち、第1点P1が位置する部分の接線方向に延びる。そして、基準直線RLに沿った、第5点P5から第2点P2までの距離H1を、基準距離Hの0.80倍に、第5点P5から第3点までの距離H2を、基準距離Hの0.65倍に、第5点P5から第4点P4までの距離H3を、基準距離Hの0.30倍にそれぞれ設定する。
なお本実施形態では、第3点P3と第4点P4との間の直交方向Dに沿った水平距離D3は、水平距離D1および水平距離D4よりも大きい。
すなわち、第3点P3が位置する部分が、タイヤ周方向の他方側に張り出す時に、第2点P2が位置する部分を、タイヤ周方向の一方側に張り出す。
さらに、第3点P3と第4点P4とを通る第3傾斜直線SL3の直交方向Dに対する傾斜角度θ3は、傾斜角度θ2よりも大きく、傾斜角度θ4は、傾斜角度θ3よりも大きい。
そして、連結部材15のタイヤ周方向に沿った大きさである厚さ(板厚)は、第1点P1および第5点P5それぞれから第4点P4に向かうに従い漸次小さく(薄く)なる。
0.9<(θ3/θ)<1.2 … (1)
さらに本実施形態では、傾斜角度θ1、θ2、θ3、θ4は、以下の(2)式から(5)式の関係を満たす。
0.35<(θ2/θ1)<0.95 … (2)
0.3<(θ2/θ4)<0.8 … (3)
0.4<(θ2/θ3)<0.9 … (4)
0.7<(θ3/θ4)<0.95 … (5)
なお、傾斜角度θ、θ1、θ2、θ3、θ4はそれぞれ、以下の(1)´式から(5)´式の関係を満たすことが好ましい。
1.00≦(θ3/θ)≦1.10 … (1)´
0.44≦(θ2/θ1)≦0.89 … (2)´
0.38≦(θ2/θ4)≦0.67 … (3)´
0.46≦(θ2/θ3)≦0.80 … (4)´
0.82≦(θ3/θ4)≦0.92 … (5)´
以上により、取り付け体11と外筒体13との間で連結部材15にタイヤ径方向の圧縮力が加えられたときに、連結部材15のうち、第2点P2から第3点P3を通り第4点P4に至るまでの中央部を、タイヤ周方向の他方側に向けて緩やかに撓み変形させ、連結部材15の両端部を変形させ難くすることができる。これにより、連結部材15における応力の集中を抑制することが可能になり、耐久性を向上させることができる。
また、第3傾斜直線SL3の傾斜角度θ3は、第2傾斜直線SL2の傾斜角度θ2よりも大きいので、連結部材15の中央部を、タイヤ側面視でタイヤ周方向の他方側に向けて突となるように形成して撓み変形させ易くすることができる。
また、連結部材15のタイヤ周方向に沿った大きさが、第1点P1および第5点P5それぞれから第4点P4に向かうに従い漸次小さくなるので、連結部材15が変形するときに、連結部材15のうち、第4点P4上に位置する部分を起点として連結部材15を変形させ易くすることができる。これにより、連結部材15の中央部を積極的に撓み変形させ易くすることができる。
さらに、上述した実施の形態では、内筒体12を介して連結部材15を取り付け体11の外リング部18に間接的に連結する構成としたが、これに限定されるものではなく、例えば取り付け体11の外リング部18に連結部材15を直接的に連結する構成としても構わない。この場合、連結部材15の内端部15b側の端縁が、外リング部18の外周面上に位置し、第5点P5を、外リング部18の外周面上に設定することが可能である。
この検証試験では、比較例および実施例の各非空気入りタイヤに関して、有限要素法を用いたシミュレーションにおいて、荷重を負荷した時のタイヤに発生する応力の最大値を比較した。
なお表1において、傾斜角度θ1~θ4、θの各値の単位は「度(°)」であり、水平距離D1~D4の各値の単位は「ミリメートル(mm)」である。
一方、比較例の非空気入りタイヤでは、水平距離D2が、水平距離D1、D4よりも小さく、傾斜角度θ2が、傾斜角度θ1、θ4よりも大きく、傾斜角度θ3が、傾斜角度θ2よりも小さく、傾斜角度θ4が、傾斜角度θ3よりも小さい。
以上により、取り付け体と外筒体との間で連結部材にタイヤ径方向の圧縮力が加えられたときに、連結部材のうち、第2点から第3点を通り第4点に至るまでの中央部を、タイヤ周方向の他方側に向けて緩やかに撓み変形させ、連結部材の両端部を変形させ難くすることができる。これにより、連結部材における応力の集中を抑制することが可能になり、耐久性を向上させることができる。
11 取り付け体
13 外筒体
14 連結体
15 連結部材
15a 外端部(一端部)
15b 内端部(他端部)
CL 中心線
D 直交方向
D1、D2、D4 水平距離
H 基準距離
H1、H2、H3 距離
O 軸線(タイヤ軸)
P1 第1点
P2 第2点
P3 第3点
P4 第4点
P5 第5点
RL 基準直線
SL 全体傾斜直線
SL1 第1傾斜直線
SL2 第2傾斜直線
SL3 第3傾斜直線
SL4 第4傾斜直線
θ、θ1、θ2、θ3、θ4 傾斜角度
Claims (6)
- 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繞する外筒体と、
前記外筒体と前記取り付け体とを連結する連結体と、を備え、
前記連結体には、タイヤ周方向に間隔をあけて複数配置されるとともに両端部が前記取り付け体および前記外筒体にそれぞれ連結され、タイヤ径方向の外側の端部である一端部がタイヤ径方向の内側の端部である他端部よりもタイヤ周方向の一方側に位置する連結部材が備えられている非空気入りタイヤであって、
この非空気入りタイヤをタイヤ幅方向から見たタイヤ側面視で、
前記連結部材において前記一端部から前記他端部に至る全長にわたって前記連結部材のタイヤ周方向の中心を通る中心線上に、前記一端部側から前記他端部側に向けて順に、第1点、第2点、第3点、第4点および第5点を設定し、
かつ、前記第1点を、前記連結部材における前記一端部側の端縁上に設定し、前記第5点を、前記連結部材における前記他端部側の端縁上に設定し、
かつ、前記第1点とタイヤ軸とを通る基準直線に沿った、前記第5点から前記第2点までの距離H1を、前記第5点から第1点までの基準距離Hの0.80倍に、前記第5点から前記第3点までの距離H2を、前記基準距離Hの0.65倍に、前記第5点から前記第4点までの距離H3を、前記基準距離Hの0.30倍にそれぞれ設定したときに、
前記第3点は、前記第1点と前記第5点とを通る全体傾斜直線よりもタイヤ周方向の他方側に配置され、
かつ、前記第2点と前記第3点との間の、前記基準直線に直交する直交方向に沿った水平距離D2は、前記第1点と前記第2点との間の前記直交方向に沿った水平距離D1、および前記第4点と前記第5点との間の前記直交方向に沿った水平距離D4よりも大きい非空気入りタイヤ。 - 前記第2点と前記第3点を通る第2傾斜直線の前記直交方向に対する傾斜角度θ2は、前記第1点と前記第2点とを通る第1傾斜直線の前記直交方向に対する傾斜角度θ1、および前記第4点と前記第5点とを通る第4傾斜直線の前記直交方向に対する傾斜角度θ4よりも小さい請求項1記載の非空気入りタイヤ。
- 前記第3点と前記第4点とを通る第3傾斜直線の前記直交方向に対する傾斜角度θ3は、前記傾斜角度θ2よりも大きい請求項2に記載の非空気入りタイヤ。
- 前記傾斜角度θ4は、前記傾斜角度θ3よりも大きい請求項3に記載の非空気入りタイヤ。
- 前記連結部材のタイヤ周方向に沿った大きさは、前記第1点および前記第5点それぞれから前記第4点に向かうに従い漸次小さくなる請求項1から4のいずれか1項に記載の非空気入りタイヤ。
- 前記第2点は、前記第1点と前記第5点とを通る前記全体傾斜直線よりもタイヤ周方向の一方側に配置される請求項1に記載の非空気入りタイヤ。
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