JP2004058866A - Support body and pneumatic run-flat tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support body capable of improving efficiency of tightening work of connection members attached to the vicinity of both end parts and to provide a pneumatic run-flat tire keeping predetermined resistance in the vicinity of a tightening section tightening both end parts of the support body when puncture occurs. <P>SOLUTION: Since end faces 44A, 44B in the longitudinal direction of the support body formed precisely according to set dimension are formed in the direction for forming an angle θ for the direction of width crossing the peripheral direction orthogonally when viewed in the radial direction, the interference of angle parts 46A, 46B and angle parts 48A, 48B is eliminated in the tightening work for tightening the connection members 34 by matching the end faces 44A, 44B mutually. Moreover, since the tightening direction of a bolt 40 and a nut 42 for tightening is inclined by an angle ϕ from the direction crossing the end faces 44A, 44B orthogonally when viewed in the radial direction, component of force in the direction crossing the tightening direction orthogonally of force generated along the end faces 44A, 44B when a vehicle performs run-flat running is suppressed, and reduction of tightening force of the bolt 40 and the nut 42 is prevented. <P>COPYRIGHT: (C)2004,JPO

Description

表１の「ランフラット走行性」欄において、「◎」はランフラット走行における走行距離が４００ｋｍ以上であることを示し、「○」は２００ｋｍ以上４００ｋｍ未満であることを示す。なお、この試験例では、ランフラット走行における走行距離が２００ｋｍ未満である場合はなかった。
【００６１】
「組込み作業性」欄の試験結果は、１０人の作業者でタイヤ内に各サンプルの支持体を組み込む作業時間の平均値で判定した。
【００６２】
「組込み作業性」欄において、比較例１での組込み作業時間の平均値（「○」で示す）を基準時間とし、「◎」は作業時間が基準時間の半分以下であったことを示す。なお、この試験例では、作業時間が基準時間の１．５倍以上となる場合はなかった。
【００６３】
「比較例１」は、「組込み作業性」において優れた効果を有さないものの「ランフラット走行性」において優れた効果を有する。また、「比較例２」は、「ランフラット走行性」において優れた効果を有さないものの「組込み作業性」において優れた効果を有する。
【００６４】
一方、「実施例」は、「組込み作業性」及び「ランフラット走行性」の双方において優れた効果を有する。すなわち、「実施例」は、「先行技術１」及び「先行技術２」における不具合を解消していることがわかる。表１に示される如く、「組込み作業性」及び「ランフラット走行性」の双方において優れた効果を有するには、「実施例」が最良かつ最適である。
【００６５】
このように実施例では、支持体１６の端部３２Ａの角部４６Ａ、４６Ｂと端部３２Ｂの角部４８Ａ、４８Ｂとが干渉することがなくなり締結作業における作業効率が向上すると共に、ランフラット走行時であっても締結箇所付近においてランフラット走行に必要とされる所定の耐性を保つことが確認できた。
【００６６】
【発明の効果】
以上説明したように本発明の請求項１に係る支持体は、径方向視において、この支持体の一対の端面が周方向と直交する幅方向に対して角度θなす方向に形成されているため、端面同士を合わせて連結部材同士を締結する締結作業において、支持体の一方の端部の角部と他方の端部の角部とが干渉することが無くなる。これにより、支持体の両端部近傍に取り付けられた一対の連結部材の締結作業における作業効率が向上する。
【００６７】
また、径方向視において、締結部材の締結方向を端面に直交する方向から角度φ傾斜させているため、ランフラット走行時に端面に沿って発生する力の締結方向に直交する方向の分力が抑制され、締結部材の締結力が低下することが防止される。これにより、締結部材が変形又は破損することを防ぎ、支持体の両端部に取り付けられた連結部材を締結する締結力が低下することが無くなるため、ランフラット走行時に必要とされる所定の締結力を保つことができる。
【００６８】
請求項２に係る支持体は、第１角度が４°〜３０°であるため、支持体の一方の端部の角部と他方の端部の角部とが干渉することがなくなり締結作業における作業効率が向上すると共に、ランフラット走行時であっても締結箇所付近においてランフラット走行に必要とされる所定の耐性を保つことができる。
【００６９】
請求項３に係る支持体では、ランフラット走行時に周方向に沿って発生する力に対する締結部材の耐性が向上し、ランフラット走行時における支持体の耐久性を一層良好に保つことができる。
【００７０】
請求項４に係る空気入りランフラットタイヤでは、締結部材に対して作用する締結方向に直交する方向の力が抑制され、締結部材の締結力が低下することが防止され、良好なランフラット走行耐性を得ることができる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態に係る空気入りランフラットタイヤのリム装着時の断面図である。
【図２】本発明の一実施形態に係る支持体の一部省略部分斜視図である。
【図３】（Ａ）は、本発明の一実施形態に係る支持体の締結前状態を示す底面図であり、（Ｂ）は、支持体の締結後状態を示す底面図である。
【図４】本発明の一実施形態に係る支持体の変形例を示し、（Ａ）は、支持体の締結前状態を示す底面図であり、（Ｂ）は、支持体の締結後状態を示す底面図である。
【符号の説明】
１０　　空気入りランフラットタイヤ
１２　　リム
１４　　空気入りタイヤ
１６　　支持体
２４　　トレッド部
２６　　支持部
３２　　両端部
３２Ａ　端部
３２Ｂ　端部
３４　　連結部材（連結部材）
４０　　締結用ボルト（締結部材）
４２　　ナット（締結部材）
４４Ａ　端面
４４Ｂ　端面
θ　　　角度（第１角度）
φ　　　角度（第２角度）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an annular support disposed inside a tire so that it can travel a considerable distance in a punctured state in a punctured state, and a pneumatic run-flat tire in which the support is disposed. .
[0002]
[Prior art]
Run-flat running is possible with a pneumatic tire, that is, a tire (hereinafter, referred to as a run-flat tire) that can run with a certain distance with confidence even when the tire pressure becomes 0 kg / cm ^{2 due} to puncturing. There is known a core type in which an annular core (support) made of metal or synthetic resin is attached to a rim portion in a tire air chamber.
[0003]
This support is formed into an annular shape by bending a long plate member having a predetermined cross-sectional shape. More specifically, the connecting members attached near both ends are joined together by using fastening members such as bolts and nuts so that both ends of the annular plate member are joined to form a support. In addition, when the support is viewed in the radial direction, a longitudinal end face (hereinafter, simply referred to as an end face) of the support (plate member) is generally cut in a direction substantially orthogonal to a circumferential direction (longitudinal direction). (Hereinafter referred to as Prior Art 1). Further, for the purpose of improving the workability of the end face alignment, there has been proposed a configuration in which both ends are cut at a predetermined angle with respect to a width direction orthogonal to a circumferential direction (longitudinal direction) (hereinafter, Prior Art 2). ). In both Prior Art 1 and Prior Art 2, the fastening direction in which the connecting members are fastened to each other using the fastening member is substantially orthogonal to the end face of the support when viewed in the radial direction.
[0004]
[Problems to be solved by the invention]
However, in the prior art 1, in the fastening operation of joining the connecting members by abutting both ends, it is necessary to match both end faces of the support, so that one end is relatively positioned with respect to the other end. You need to move it. At this time, since the support is formed (bent) according to the set dimensions, there is a possibility that a corner at one end and a corner at the other end may interfere with each other. In order to avoid this interference, it is necessary to perform an operation such as widening the interval between the end faces of the support in the radial direction once in the radial direction. For this reason, there was a problem that the fastening operation was complicated and the operation efficiency was low.
[0005]
Further, in the prior art 2, the work of fastening the connecting members attached to both ends is easier than in the prior art 1, and the working efficiency is improved. However, during run-flat traveling, a force in the direction along the end face of the support acts on the fastening member via the connecting member. For this reason, when bolts and nuts are used to fasten the connecting member, for example, a force acts between the head and the screw portion of the bolt and between the screw portion of the bolt and the nut. In some cases, the bolt is deformed or broken, and the fastening force is reduced. For this reason, it is not possible to maintain a predetermined resistance (fastening force) required during run-flat traveling near a place where both ends are fastened (hereinafter, referred to as a fastening place).
[0006]
In consideration of the above facts, the present invention provides a support that improves the efficiency of fastening work of a connecting member attached near both ends, and a predetermined position near a fastening point where both ends of the support are fastened when punctured. It is an object of the present invention to provide a pneumatic run-flat tire that maintains the resistance of the tire.
[0007]
[Means for Solving the Problems]
The support according to claim 1 is an annular support that is disposed inside the pneumatic tire, is mounted on the rim together with the pneumatic tire, and can support a load during run-flat running, and is an elongated support. A support member having a predetermined radial cross-sectional shape capable of supporting a load by making the plate member annular; a pair of connection members attached near both ends in the longitudinal direction of the plate member; and the pair of connection members A fastening member for fastening the members to each other to make the plate member an annular support portion, wherein in the radial direction, the long ends of the plate member serving as the support portion have widths orthogonal to the circumferential direction. An end face inclined at a first angle with respect to the direction is formed, and a fastening direction of the fastening member is inclined at a second angle from a direction orthogonal to the end face.
[0008]
The operation of the support according to claim 1 will be described.
[0009]
The support can be disposed inside a conventional pneumatic tire (air chamber) and assembled with the rim together with the pneumatic tire. When the run-flat tire thus assembled is mounted on an automobile and run, when the internal pressure of the pneumatic tire drops, the support provided in the tire air chamber replaces the side rubber layer and supports the load, Running becomes possible.
[0010]
By the way, when viewing both ends of the support formed to the set dimensions in the radial direction, the end face is formed in the direction forming the first angle with respect to the width direction. In the fastening work for fastening the connecting member, even if one end is moved relative to the other end in order to align the end faces, the corner of one end of the support and the other end Interference with the corners of the part is eliminated. Thereby, the work efficiency in the fastening work of the pair of connecting members attached near both ends of the support is improved.
[0011]
In addition, when the load acts on the support during run-flat running, a force is generated at which both ends relatively move along the end surface. This force acts on the fastening member via connecting members provided at both ends.
[0012]
At this time, there is a possibility that the fastening force of the fastening member is reduced or the fastening member is broken by a force orthogonal to the fastening direction of the fastening member.
[0013]
However, in the present invention, since the fastening direction is inclined by the second angle from the direction orthogonal to the end face, only the component force in the direction orthogonal to the fastening direction of the force generated along the end face during run flat running is applied to the fastening member. On the other hand, it acts as a force for reducing the fastening force. That is, the force acting on the fastening member in a direction perpendicular to the fastening direction is suppressed, and the fastening force of the fastening member is prevented from being reduced. Here, the “fastening direction” refers to the axial direction of the bolt when, for example, a bolt and a nut are used as the fastening member. Thereby, the fastening member is prevented from being deformed or damaged, and the fastening force for fastening the connecting members attached to both ends of the support body does not decrease, so that the predetermined fastening force required during run flat traveling Can be kept.
[0014]
The support according to claim 2 is the support according to claim 1, wherein the first angle is 4 ° to 30 °.
[0015]
The operation of the support according to claim 2 will be described.
[0016]
When the first angle is less than 4 °, one end is moved relatively to the other end in the vicinity of both ends of the support in order to align the end faces of the support in the radial direction. When a pair of attached connecting members are fastened with a fastening member, a corner at one end and a corner at the other end interfere with each other. On the other hand, if the first angle exceeds 30 °, the predetermined tolerance required for run flat running cannot be maintained near the fastening portion of the support during run flat running. However, according to the present invention, since the first angle is 4 ° to 30 °, the corner at one end and the corner at the other end of the support body do not interfere with each other, and the work in the fastening operation is not performed. Efficiency is improved, and even during run-flat running, a predetermined tolerance required for run-flat running can be maintained near the fastening point.
[0017]
The support according to claim 3 is the support according to claim 1 or 2, wherein an angle between the fastening direction and the circumferential direction is 0 ° to 3 ° when viewed in a radial direction. And
[0018]
The operation of the support according to claim 3 will be described.
[0019]
At the time of run flat running, in the radial direction, a force generated along the circumferential direction other than the force generated along the end face acts on the fastening member.
[0020]
Therefore, by making the angle between the fastening direction of the fastening member and the circumferential direction 0 ° to 3 ° and making the fastening direction substantially the same as the circumferential direction, the fastening with respect to the force generated along the circumferential direction during run flat running. The durability of the member is improved, and the durability of the support during run-flat running can be further improved.
[0021]
The run flat tire according to claim 4, wherein the carcass is formed in a toroidal shape between a pair of bead cores, a side rubber layer disposed outside the carcass in the tire axial direction to form a tire side portion, and a tire diameter of the carcass. A tread rubber layer that constitutes a tread portion and is disposed on the outer side in the direction, and is mounted on the rim, and is disposed inside the tire and assembled to the rim together with the tire. And the support according to item 1.
[0022]
The operation of the run flat tire according to claim 4 will be described.
[0023]
When the internal pressure of the pneumatic tire is reduced, the support disposed in the tire air chamber supports the tread portion instead of the side rubber layer, so that run-flat running is possible.
[0024]
By the way, during run flat running, a load acts on the support portion of the support from the tread portion. When a load is applied to the support portion during the run flat running, a force is generated in which both ends of the support relatively move along the end surface of the support. In the present invention, since the fastening direction is inclined by the second angle from the direction orthogonal to the end face, only the component force in the direction orthogonal to the fastening direction of the force generated along the end face during run flat running is applied to the fastening member. Acts as a force to reduce the fastening force. That is, the force acting on the fastening member in a direction perpendicular to the fastening direction is suppressed, and the fastening force of the fastening member is prevented from being reduced. That is, a pneumatic runflat tire having good runflat running resistance can be provided.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
A pneumatic run flat tire according to one embodiment of the present invention will be described with reference to FIGS.
[0026]
Here, the run-flat tire 10 refers to a rim 12 in which a pneumatic tire 14 and a support 16 are assembled, as shown in FIG. The rim 12 is a standard rim corresponding to the size of the pneumatic tire 14.
[0027]
As shown in FIG. 1, the pneumatic tire 14 includes a pair of bead portions 18, a toroidal carcass 20 extending across both the bead portions 18, and a plurality of carcass 20 located in a crown portion of the carcass 20 (the present embodiment). (2 sheets in FIG. 2) and a tread portion 24 formed on the belt layer 22.
[0028]
The support 16 disposed inside the pneumatic tire 14 has the cross-sectional shape shown in FIG. 1 formed in a ring shape, and is vulcanized and formed at both ends of the support 26 and the support 26. Rubber legs 28.
[0029]
The leg 28 is attached to the rim 12 inside the pneumatic tire 14 when the support 16 is attached to the rim.
[0030]
Here, the standard rim is a rim specified by JATMA (Japan Automobile Tire Association) for Year Book 2002.
[0031]
Outside Japan, the rim is a standard rim (or “Approved Rim”, “Recommended Rim”) in the applicable size described in the following standard.
[0032]
Standards are determined by industry standards that are in effect in the area where the tire is manufactured or used. For example, in the United States it is "The Book of The Tire and Rim Association Inc." and in Europe it is "Standards Manual of the European Tire and Rim Technical Organization".
[0033]
On the other hand, as shown in FIG. 2, the support portion 26 is formed by forming one long plate member (plate) to form convex portions 30 </ b> A and 30 </ b> B that protrude radially outward, and between them. A concave portion 30C that is convex inward in the radial direction, and side portions 30D and 30E that support the load in the width direction (X direction) outside (the opposite side to the concave portion 30C) of the convex portions 30A and 30B are formed. Flanges 30F, 30G extending substantially in the tire rotation axis direction are formed at radially inner ends (rim-side ends) of the side portions 30D, 30E (the leg 28 is not shown in FIG. 2). are doing).
[0034]
Further, a pair of connecting members 34 are attached to the inner side in the radial direction near both ends 32 (hereinafter simply referred to as both ends 32) of the support 16 in the circumferential direction (long direction) (described later). The pair of connecting members 34 are fastened by fastening bolts (hereinafter simply referred to as bolts) 40 and nuts 42 (described later).
[0035]
When the vicinity of both ends 32 of the support 16 is viewed from the inside in the radial direction, as shown in FIGS. 3A and 3B, the end surfaces 44A and 44B are formed on the both ends 32 in the width direction orthogonal to the circumferential direction. It is formed so as to be inclined at an angle θ with respect to it. Is in the range of 4 ° to 30 °, preferably 6 ° to 20 °, more preferably 8 ° to 18 °, for example, 13 °. Is less than 4 °, the end 32A is moved relative to the end 32B in order to align the end surface 44A and the end surface 44B of the support 16 in the radial direction, When the connecting members 34 attached near the both ends 32 are fastened with the bolts 40 and the nuts 42, the corners 46A and 46B of the end 32A and the corners 48A and 48B of the end 32B interfere. If the angle θ exceeds 30 °, the predetermined resistance required for run-flat traveling cannot be maintained near the fastening portion of both ends 32 of the support 16 during run-flat traveling. In order to avoid such a problem, the angle θ is set.
[0036]
A connecting member 34 for fastening the both ends 32 is attached to the inside of the ends 32A and 32B of the support 16 in the radial direction. As shown in FIG. 2, the connecting member 34 has a contact surface 34A having a cross section substantially the same as the cross sectional shape of the support 16 and a hole 38 formed orthogonal to the contact surface and through which a bolt 40 described later is inserted. And an end face 34B formed with a.
[0037]
In order to attach the connecting member 34 to the inside of the ends 32A and 32B of the support 16 in the radial direction, the connecting member 34 may be attached to the ends 32A and 32B by welding, riveting, or the like.
[0038]
The connecting member 34 has a predetermined interval so that the end surface 34B of the connecting member 34 does not protrude from the both ends 32 in the circumferential direction when the both ends 32 are viewed from the outside in the radial direction. It is supposed to be attached to. Accordingly, when the connecting members 34 are fastened by abutting the end portions 32A and 32B, the connecting member 34 attached to the end portion 32A of the support 16 and the connecting member 34 attached to the end portion 32B are Will not interfere.
[0039]
More specifically, in the present embodiment, the angle θ formed by the width direction and the direction along the end surfaces 44A and 44B in the radial direction is 13 °. When the support 16 is viewed in the radial direction, the fastening direction in which the connecting members 34 are fastened to each other is inclined at an angle φ from a direction orthogonal to the end surfaces 44A and 44B. Here, the “fastening direction” refers to the axial direction of the bolt 40. In the present embodiment, angle φ is set to substantially the same angle as angle θ. That is, the fastening direction is substantially parallel to the circumferential direction.
[0040]
Here, the angle between the fastening direction and the circumferential direction is 0 ° to 3 °. This is to avoid a problem that when the angle between the fastening direction and the circumferential direction exceeds 3 °, the resistance near the fastening portion gradually decreases as the traveling distance increases during run flat traveling. .
[0041]
The bolt 40 and the nut 42 make the plate member the annular support portion 26 by fastening the pair of connecting members 34 to each other.
[0042]
The fastening operation for fastening the connecting members 34 attached to the both ends 32 of the support 16 is performed by inserting the bolt 40 into the hole 38 and fastening with the nut 42 with the end faces 44A and 44B aligned. is there. Thus, the plate member serves as an annular support portion.
[0043]
The operation of the support 16 and the run flat tire 10 will be described.
[0044]
As shown in FIG. 3 (A), in a fastening operation for fastening a connecting member 34 attached near both ends 32 of the support 16 formed to the set dimensions, the end faces 44A and 44B are aligned with each other. The portion 32A is moved relatively to the end 32B.
[0045]
More specifically, one corner 46A of the end 32A indicated by the point A moves to the position indicated by the point A ', and accordingly, the other corner of the end 32A indicated by the point B changes to the point B'. Move to the position shown.
[0046]
Here, when the both end portions 32 of the support 16 are viewed in the radial direction, the end surfaces 44A and 44B are formed in a direction forming an angle θ (4 ° to 30 °) with respect to the width direction. The corners 46A and 46B of the end 32A do not interfere with the corners 48A and 48B of the end 32B.
[0047]
As shown in FIG. 3B, when the points A and A 'coincide with the points B and B', the bolt 40 is inserted into the hole 38 formed in the end face 34B of the connecting member 34.
[0048]
The bolts 40 are inserted into the holes 38 of the pair of connecting members 34 in a state where the end surfaces 44A and 44B are aligned, and fastened with the nuts 42. This prevents the corners 46A, 46B and the corners 48A, 48B from interfering when the end face 44A and the end face 44B are joined, and prevents the pair of connecting members 34 attached near the both ends 32 of the support 16 from being joined. The work efficiency in the fastening operation is improved, and the predetermined tolerance required for the run flat traveling near the fastening point can be maintained even during the run flat traveling.
[0049]
On the other hand, when the internal pressure of the pneumatic tire is reduced, the support 16 disposed in the tire air chamber supports the tread portion 24 instead of the carcass 20, so that run-flat running is possible. When a load acts on the support portion 26 of the support 16 from the tread portion 24 during run flat running, a force is generated that causes the end portion 32A and the end portion 32B to relatively move along the end surfaces 44A and 44B. . This force acts on the bolt 40 via a connecting member 34 provided at both ends 32.
[0050]
At this time, the force perpendicular to the fastening direction acts on the bolt 40, and thus the fastening force between the bolt 40 and the nut 42 may be reduced or the bolt 40 may be broken.
[0051]
However, in the support 16, the fastening direction is inclined by an angle φ from the direction perpendicular to the end faces 44 A, 44 B, and therefore, the force generated along the end faces 44 A, 44 B during the run flat running in the direction perpendicular to the fastening direction. Only the force acts on the bolt 40 as a force for reducing the fastening force. That is, the force acting on the bolt 40 in the direction orthogonal to the fastening direction is suppressed, and a decrease in the fastening force between the bolt 40 and the nut 42 is prevented. As a result, the bolt 40 is prevented from being deformed or damaged, and the fastening force for fastening the connecting members 34 attached to the both ends 32 of the support 16 is not reduced. Can be maintained. That is, the pneumatic runflat tire 10 having good runflat running resistance can be provided.
[0052]
In the run-flat running, a force generated along the circumferential direction in addition to the force generated along the end face also acts on the bolt 40 and the nut 42 when viewed in the radial direction.
[0053]
Therefore, the angle between the fastening direction of the bolt 40 and the nut 42 and the circumferential direction is set to 0 ° to 3 °, and the fastening direction is made substantially the same as the circumferential direction. The resistance of the bolt 40 and the nut 42 to the force to be applied is improved, and the durability of the support 16 during run flat traveling can be further favorably maintained.
(Modification)
Next, a modified example of the support 16 used in the present embodiment will be described.
[0054]
As shown in FIGS. 4 (A) and 4 (B), a support 16A, which will be described below, has a circumferential attachment of a connecting member 34 radially inside the ends 32A and 32B of the support 16 described above. The position has been changed. Hereinafter, portions having the same configuration and the same operation as those of the above-described support 16 are denoted by the same reference numerals, and description thereof will be omitted.
[0055]
When the support 16A is viewed in the radial direction, a part of the connecting member 34 on the side of the end surface 34B protrudes from the ends 32A and 32B in the circumferential direction from near the fastening portion between the end 32A and the end 32B. Here, the position where the connecting member 34 is attached to the ends 32A and 32B has a distance such that one connecting member 34 and the other connecting member 34 do not interfere with each other when the ends 32A and 32B are abutted against each other. Any position may be used (see FIG. 4A). When the end portion 32A is moved relative to the end portion 32B in order to align the end portion 32A and the end portion 32B, the connecting members 34 do not interfere with each other. The work efficiency is improved in the same manner as when the fastener 32 is fastened. In addition, since the interval between the end surfaces 34B of the connecting member 34 is smaller than the interval between the end surfaces 34B of the connecting member 34 attached to the support 16, the predetermined fastening force required during run flat traveling is further reduced. Can be kept good. That is, the pneumatic runflat tire 10 having good runflat running resistance can be provided.
(Test example)
In order to confirm the operation of the above-described embodiment, a comparative test (hereinafter simply referred to as Comparative Example 1) between a run-flat tire according to an example shown below (hereinafter simply referred to as an example) and two types of run-flat tires according to a comparative example will be described. , Comparative Example 2).
[0056]
The example has the same configuration as that of the run flat tire described in the embodiment, and a structure in which the support 16 is inserted into a pneumatic tire of 195 / 65R15 size is assembled to a standard rim (6J) corresponding to the above tire size. Things. The plate thickness of the metal supporting portion 26 of the support 16 of the embodiment is 0.8 mm.
[0057]
Comparative Examples 1 and 2 correspond to Prior Art 1 and Prior Art 2 described in (Prior Art). Comparative Example 1 has exactly the same shape as the example except that the end face is cut in a direction substantially perpendicular to the circumferential direction (longitudinal direction) when the support is viewed in the radial direction. is there. Comparative Example 2 is completely the same as the embodiment except that the direction in which the connecting members are fastened to each other by the bolt and the nut is orthogonal to the end face of the support when the support is viewed in the radial direction. Shape.
[0058]
Here, the angle θ and the angle between the fastening direction and the circumferential direction are 13 ° and 0 ° in the “Example”, respectively, 0 ° in the “Comparative Example 1”, and 13 ° in the “Comparative Example 2”. And
[0059]
Table 1 shows test results in which the run-flat tires according to the example and the comparative examples formed as described above were mounted on a passenger car and run-flat-running (one wheel) with only one wheel having zero air pressure.
[0060]
[Table 1]

In the “Run-flat traveling performance” column of Table 1, “◎” indicates that the traveling distance in the run-flat traveling is 400 km or more, and “」 ”indicates that the traveling distance is 200 km or more and less than 400 km. In this test example, there was no case where the traveling distance in run flat traveling was less than 200 km.
[0061]
The test results in the column of "Built-in workability" were determined by the average value of the working time for assembling the support of each sample into the tire by ten workers.
[0062]
In the “Embedded workability” column, the average value of the built-in work time (indicated by “○”) in Comparative Example 1 is set as the reference time, and “◎” indicates that the work time was less than half the reference time. In this test example, there was no case where the working time was 1.5 times or more the reference time.
[0063]
“Comparative Example 1” does not have an excellent effect on “incorporation workability”, but has an excellent effect on “run-flat running performance”. "Comparative Example 2" does not have an excellent effect in "run-flat running performance", but has an excellent effect in "incorporation workability".
[0064]
On the other hand, the “Example” has excellent effects in both “Built-in workability” and “Run-flat running performance”. In other words, it can be seen that “Example” eliminates the inconveniences of “Prior Art 1” and “Prior Art 2”. As shown in Table 1, the "Example" is the best and optimal to have excellent effects in both "Built-in workability" and "Run-flat running performance".
[0065]
As described above, in the embodiment, the corners 46A and 46B of the end 32A of the support 16 and the corners 48A and 48B of the end 32B do not interfere with each other, so that the work efficiency in the fastening operation is improved and the run-flat running is performed. Even at this time, it was confirmed that a predetermined resistance required for run flat running was maintained near the fastening point.
[0066]
【The invention's effect】
As described above, the support according to claim 1 of the present invention is formed such that, when viewed in the radial direction, a pair of end surfaces of the support are formed at an angle θ with respect to a width direction orthogonal to the circumferential direction. In the fastening operation of joining the connecting members by joining the end faces together, the corner of one end of the support and the corner of the other end do not interfere with each other. Thereby, the work efficiency in the fastening work of the pair of connecting members attached near both ends of the support is improved.
[0067]
In addition, when viewed in the radial direction, since the fastening direction of the fastening member is inclined by an angle φ from a direction orthogonal to the end face, a component force in the direction orthogonal to the fastening direction of the force generated along the end face during run flat running is suppressed. Thus, a decrease in the fastening force of the fastening member is prevented. Thereby, the fastening member is prevented from being deformed or damaged, and the fastening force for fastening the connecting members attached to both ends of the support body does not decrease, so that the predetermined fastening force required during run flat traveling Can be kept.
[0068]
Since the first angle of the support according to claim 2 is 4 ° to 30 °, the corner at one end and the corner at the other end of the support are not interfered with each other, and the support is used in a fastening operation. The work efficiency is improved, and a predetermined tolerance required for run-flat running can be maintained near the fastening point even during run-flat running.
[0069]
In the support according to the third aspect, the resistance of the fastening member to the force generated in the circumferential direction during the run flat running is improved, and the durability of the support during the run flat running can be further maintained.
[0070]
In the pneumatic run-flat tire according to the fourth aspect, the force acting on the fastening member in the direction perpendicular to the fastening direction is suppressed, the fastening force of the fastening member is prevented from lowering, and good run-flat running resistance is achieved. Can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pneumatic run-flat tire according to a first embodiment of the present invention when a rim is mounted.
FIG. 2 is a partially omitted partial perspective view of a support according to an embodiment of the present invention.
FIG. 3A is a bottom view showing a state before fastening of a support according to an embodiment of the present invention, and FIG. 3B is a bottom view showing a state after fastening of the support.
4A and 4B show a modification of the support according to the embodiment of the present invention, wherein FIG. 4A is a bottom view showing a state before the support is fastened, and FIG. 4B is a view showing a state after the support is fastened. It is a bottom view shown.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Pneumatic run flat tire 12 Rim 14 Pneumatic tire 16 Support body 24 Tread part 26 Support part 32 Both ends 32A End 32B End 34 Connection member (connection member)
40 Fastening bolts (fastening members)
42 nut (fastening member)
44A End face 44B End face θ Angle (first angle)
φ angle (second angle)

Claims (4)

An annular support that is disposed inside the pneumatic tire and is attached to the rim together with the pneumatic tire, and is capable of supporting a load during run flat running,
A support portion having a predetermined radial cross-sectional shape capable of supporting a load by the long plate member being annular,
A pair of connecting members attached near both ends of the plate member in the longitudinal direction,
A fastening member that makes the plate member an annular support by fastening the pair of connecting members,
When viewed in the radial direction, both ends in the longitudinal direction of the plate member serving as the support portion have an end surface inclined at a first angle with respect to a width direction orthogonal to the circumferential direction, and the fastening member has A support, wherein a fastening direction is inclined at a second angle from a direction orthogonal to the end face. The support according to claim 1, wherein the first angle is 4 ° to 30 °. 3. The support according to claim 1, wherein an angle formed by the fastening direction and the circumferential direction is 0 ° to 3 ° when viewed in a radial direction. 4. A carcass formed in a toroidal shape over a pair of bead cores, a side rubber layer disposed outside the carcass in the tire axial direction to constitute a tire side portion, and a tread portion disposed outside the carcass in a tire radial direction. Tire with a tread rubber layer to be attached to the rim,
The support according to any one of claims 1 to 3, which is disposed inside the tire and is attached to a rim together with the tire.
A pneumatic run-flat tire comprising:

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