JP2004051010A - Tire wheel assembly and run-flat supporter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire wheel assembly and a run-flat supporter capable of improving durability during ran-flat travelling. <P>SOLUTION: In the tire wheel assembly, a pneumatic tire 2 is fitted to the rim 1 of a wheel, and the run-flat supporter 3, comprising an annular shell 4 having leg parts 4b along both sides of the supporting surface 4a while bulging the supporting surface 4a to the outer peripheral side, and an elastic ring 5 supporting the leg parts 4b of the annular shell 4 on the rim 1, is inserted into the hollow part of the pneumatic tire 2. The leg part 4b of the annular shell 4 is provided with a clamp part 6 covering the joint of the elastic ring 5. <P>COPYRIGHT: (C)2004,JPO

Description

この表１に示すように、実施例のタイヤホイール組立体はランフラット走行時の耐久性が従来よりも優れていた。
【００３０】
【発明の効果】
以上説明したように本発明によれば、支持面を外周側に張り出しつつ該支持面の両側に沿って脚部を持つ環状シェルと、該環状シェルの脚部をリム上に支持する弾性リングとからなるランフラット用支持体について、環状シェルの脚部に弾性リングの接合部を覆うクランプ部を設けたから、ランフラット走行時の耐久性を従来よりも向上することができる。
【図面の簡単な説明】
【図１】本発明の実施形態からなるタイヤホイール組立体の要部を示す子午線断面図である。
【図２】図１における環状シェルと弾性リングとの接合部を拡大して示す断面図である。
【図３】本発明におけるクランプ部の変形例を示す断面図である。
【図４】本発明におけるクランプ部の他の変形例を示す断面図である。
【図５】本発明におけるクランプ部の更に他の変形例を示す断面図である。
【図６】本発明における弾性リングの変形例を示す断面図である。
【符号の説明】
１（ホイールの）リム
２　空気入りタイヤ
３　ランフラット用支持体
４　環状シェル
４ａ　支持面
４ｂ　脚部
５　弾性リング
６　クランプ部
６ａ　上壁
６ｂ，６ｃ　側壁[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tire-wheel assembly that enables run-flat running and a run-flat support used for the same, and more particularly, to a tire-wheel assembly and run flat for improving durability during run-flat running. Regarding the support.
[0002]
[Prior art]
Many technologies have been proposed to enable a certain degree of emergency running even when a pneumatic tire is punctured while the vehicle is running, due to market demands. Among these many proposals, the technology proposed in Japanese Patent Application Laid-Open No. Hei 10-297226 and Japanese Patent Application Laid-Open No. 2001-519279 disposes a puncture by mounting a core on a rim in a cavity of a rim-assembled pneumatic tire. The run-flat running is made possible by supporting the tires thus set by the core.
[0003]
The run flat core has an annular shell with an open leg structure having legs along both sides of the support surface while extending the support surface to the outer peripheral side, and has a configuration in which elastic rings are attached to both legs. , And is supported on the rim via the elastic ring. According to the run-flat core, the existing wheels and rims can be used as they are without any special modification, so that they have an advantage that they can be accepted without causing confusion in the market.
[0004]
However, in run-flat running, the annular shell presses the elastic ring while being slightly deformed by the load, so that a large load is applied to the joint surface between the annular shell and the elastic ring. For this reason, the run-flat core is easily broken at the joint between the annular shell and the elastic ring as a starting point, and there has been a problem that the traveling distance on the run flat cannot be sufficiently secured.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a tire-wheel assembly and a run-flat support that improve durability during run-flat running.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a tire-wheel assembly of the present invention fits a pneumatic tire to a rim of a wheel and, in a cavity of the pneumatic tire, extends a support surface to an outer peripheral side while forming a support surface on an outer peripheral side. In a tire / wheel assembly in which a run-flat support body including an annular shell having legs along both sides and an elastic ring supporting the legs of the annular shell on a rim is inserted, the leg of the annular shell is A clamp portion is provided to cover the joint of the elastic ring.
[0007]
In addition, the run flat support of the present invention comprises an annular shell having legs along both sides of the support surface while extending the support surface to the outer peripheral side, and an elastic ring for supporting the legs of the annular shell on a rim. And a clamp portion for covering a joint portion of the elastic ring is provided on a leg portion of the annular shell.
[0008]
In the present invention, the outer diameter of the run flat support is formed to be smaller than the inner diameter of the tread portion of the pneumatic tire so as to keep a certain distance from the pneumatic tire, and the inner diameter of the bead portion of the pneumatic tire. It is formed with substantially the same dimensions as the inside diameter. The run flat support is assembled to a rim of a wheel together with the pneumatic tire while being inserted into the cavity of the pneumatic tire, and constitutes a tire-wheel assembly. If the pneumatic tire is punctured while the tire-wheel assembly is mounted on the vehicle and running, the punctured and crushed tire is supported by the support surface of the annular shell of the run-flat support. Running becomes possible.
[0009]
According to the present invention, since the clamp portion that covers the joint portion of the elastic ring is provided on the leg portion of the annular shell, the joint state between the annular shell and the elastic ring is stabilized, and the durability during run flat running is improved. be able to.
[0010]
In the present invention, the clamp portion has a pair of side walls sandwiching the elastic ring, and it is preferable that one of these side walls has a wider coating width than the other, and particularly, the inner side wall of the shell is wider than the outer side wall of the shell. It is preferable to have Thereby, the elastic ring can be prevented from falling down, and the joint state between the annular shell and the elastic ring can be further stabilized.
[0011]
Further, it is preferable that the coating width of the side wall of the clamp portion is 10% or more and 50% or less of the radial height of the elastic ring. Thereby, the joint state between the annular shell and the elastic ring can be stabilized without damaging the clamp portion during run flat traveling.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[0013]
FIG. 1 is a meridional sectional view showing a main part of a tire-wheel assembly (wheel) according to an embodiment of the present invention, wherein 1 is a rim of a wheel, 2 is a pneumatic tire, and 3 is a run-flat support. The rim 1, the pneumatic tire 2, and the run flat support 3 are formed in an annular shape around a wheel rotation axis (not shown).
[0014]
The run flat support 3 includes an annular shell 4 and an elastic ring 5 as main parts. The run flat support 3 is separated from the inner wall surface of the pneumatic tire 2 during normal running, but supports the collapsed pneumatic tire 2 from the inside during puncturing.
[0015]
The annular shell 4 has a leg-opening structure having a continuous support surface 4a for supporting a punctured tire extending outwardly (radially outward) and having legs 4b, 4b along both sides of the support surface 4a. It has become. The support surface 4a of the annular shell 4 is formed such that its shape in a cross section orthogonal to the circumferential direction is a curved surface convex toward the outer peripheral side. It is sufficient that at least one convex surface exists, but it is preferable that two or more convex surfaces are arranged in the tire axial direction. By forming the support surface 4a of the annular shell 4 such that two or more convex curved surfaces are arranged side by side, a contact portion of the support surface 4a with respect to the tire inner wall surface is dispersed into two or more, and a local portion applied to the tire inner wall surface is provided. In order to reduce wear, the running distance of the run-flat running can be extended.
[0016]
The annular shell 4 is made of a rigid material because it is necessary to support the weight of the vehicle via the punctured pneumatic tire 2. Metal or resin is used as the constituent material. Examples of the metal include steel and aluminum. The resin may be either a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin include nylon, polyester, polyethylene, polypropylene, polystyrene, polyphenylene sulfide, and ABS. Examples of the thermosetting resin include an epoxy resin and an unsaturated polyester resin. The resin may be used alone, or may be used as a fiber reinforced resin by blending reinforcing fibers.
[0017]
The elastic rings 5 are respectively attached to the legs 4b, 4b of the annular shell 4, and support the annular shell 4 while abutting on the left and right rim sheets. The elastic ring 5 relieves the shock and vibration that the annular shell 4 receives from the punctured pneumatic tire 2 and also stably supports the annular shell 4 by preventing slippage on the rim sheet.
[0018]
Rubber or resin can be used as a constituent material of the elastic ring 5, and rubber is particularly preferable. Examples of the rubber include natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber (SBR), butadiene rubber (BR), hydrogenated NBR, hydrogenated SBR, ethylene propylene rubber (EPDM, EPM), and butyl rubber (IIR). ), Acrylic rubber (ACM), chloroprene rubber (CR) silicone rubber, fluorine rubber and the like. Needless to say, additives such as a filler, a vulcanizing agent, a vulcanization accelerator, a softening agent and an antioxidant can be appropriately compounded in these rubbers. And a desired elastic modulus can be obtained based on the compounding of the rubber composition.
[0019]
In the above-mentioned tire-wheel assembly, the leg portions 4b, 4b of the annular shell 4 are provided with a clamp portion 6 for covering a joint portion of the elastic ring 5. FIG. 2 is an enlarged view showing a joint between the annular shell 4 and the elastic ring 5. As shown in FIG. 2, the clamp portion 6 has an upper wall 6a that covers an end surface of the elastic ring 5, and a pair of side walls 6b and 6c extending from the upper wall 6a and sandwiching the elastic ring 5.
[0020]
In the tire-wheel assembly configured as described above, when the pneumatic tire 2 is punctured during running, the crushed pneumatic tire 2 is supported by the support surface 4 a of the annular shell 4 of the run flat support 3. Therefore, run-flat running becomes possible. Here, since the clamp portions 6 that cover the joint portions of the elastic rings 5 are provided on the leg portions 4b, 4b of the annular shell 4, the joint state between the annular shell 4 and the elastic rings 5 is stabilized, and the run-flat running is performed. Can be improved in durability.
[0021]
3 to 5 show modified examples of the clamp section. The shape of the clamp portion 6 is not particularly limited as long as it covers the joint portion of the elastic ring 5. In order to further increase the stability of the joined state between the annular shell 4 and the elastic ring 5, for example, as shown in FIG. 3, the outer side wall 6b of the shell of the pair of side walls 6b and 6c sandwiching the elastic ring 5 is covered. The width Wb is made larger than the coating width Wc of the shell inner side wall 6c, or, as shown in FIG. 4, the coating width Wc of the shell inner side wall 6c is made larger than the coating width Wb of the shell outer side wall 6b. May be. In particular, in the latter case, the fall of the elastic ring 5 can be effectively prevented. Further, as shown in FIG. 5, the clamp portion 6 may have a Y-shaped cross section.
[0022]
It is preferable that the coating widths Wb, Wc of the side walls 6b, 6c of the clamp portion 6 be 10% or more and 50% or less of the radial height H of the elastic ring 5. If the coating widths Wb and Wc are less than 10% of the height H, the effect of improving the durability becomes insufficient, and if it exceeds 50%, the clamp portion 6 may be damaged during run flat running.
[0023]
The above-described clamp portion 6 can be integrally formed with the annular shell 4. However, if it is difficult to integrally form the clamp portion 6, a separately manufactured clamp portion 6 may be joined to the annular shell 4. The method of joining the clamp portion 6 and the annular shell 4 is not particularly limited, and for example, they can be welded, fitted, or integrally bent.
[0024]
FIG. 6 shows a modification of the elastic ring. In FIG. 6, the elastic ring 5 has a two-layer structure in the ring radial direction. The elastic layer 5a is made of low-modulus rubber, and the elastic layer 5b is made of high-modulus rubber. When the elastic ring 5 has a two-layer structure using materials having different elastic moduli, the rigidity of the elastic ring 5 can be given a non-linear property to enhance the buffering capacity. That is, when the projections get over the projections in a state where the tire internal pressure is low, the impacts when the projections collide with the annular shell 4 via the tires are absorbed by the elastic layer 5a having a low elastic modulus, while the elasticity is high during the run flat running. The annular shell 4 can be stably supported by the elastic layer 5b having a high modulus. Here, the clamp portion 6 substantially surrounds the outer layer portion 5a having a low elastic modulus.
As described above, since the clamp portion 6 substantially surrounds the outer layer portion 5a having a low elastic modulus, the nonlinearity of the rigidity of the elastic ring 5 can be adjusted.
[0025]
【Example】
In a tire-wheel assembly including a pneumatic tire having a tire size of 205 / 55R16 89V and a wheel having a rim size of 16 × 6 1 / 2JJ, an annular shell is formed from a steel plate having a thickness of 1.0 mm, and the legs are formed. An elastic ring made of hard rubber is joined through a clamp portion to produce a support for run flat, and the support for run flat is inserted into a cavity of a pneumatic tire to form a tire wheel assembly (Example). did.
[0026]
Also, for comparison, a run-flat support was manufactured by joining an elastic ring made of hard rubber to the legs of the annular shell without going through the clamp, except that the run-flat support was used. A tire / wheel assembly (conventional example) having the same structure as that of the example was obtained.
[0027]
The durability of the two types of tire-wheel assemblies during run-flat running was evaluated by the following measurement method. The results are shown in Table 1.
[0028]
[Durability during run flat running]
The tire-wheel assembly to be tested is mounted on the front right wheel of a FR car with a displacement of 2.5 liters, the internal pressure of the tire is set to 0 kPa (200 kPa except for the front right wheel), and the circuit goes counterclockwise at 90 km / h per hour. , And the running distance until the running became impossible was measured. The evaluation results are shown as indices with the conventional example taken as 100. The larger the index value, the better the durability during run flat running.
[0029]
[Table 1]

As shown in Table 1, the tire-wheel assemblies of the examples had better durability during run-flat running than before.
[0030]
【The invention's effect】
As described above, according to the present invention, an annular shell having legs along both sides of the support surface while projecting the support surface to the outer peripheral side, and an elastic ring for supporting the legs of the annular shell on the rim. Since the run flat support is made of a clamp portion that covers the joint of the elastic ring on the leg portion of the annular shell, the durability during run flat traveling can be improved as compared with the conventional case.
[Brief description of the drawings]
FIG. 1 is a meridian sectional view showing a main part of a tire / wheel assembly according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view showing a joint between an annular shell and an elastic ring in FIG. 1;
FIG. 3 is a cross-sectional view showing a modified example of the clamp section in the present invention.
FIG. 4 is a cross-sectional view showing another modified example of the clamp section according to the present invention.
FIG. 5 is a cross-sectional view showing still another modified example of the clamp section according to the present invention.
FIG. 6 is a sectional view showing a modification of the elastic ring according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 (Wheel) rim 2 Pneumatic tire 3 Run flat support 4 Annular shell 4a Support surface 4b Leg 5 Elastic ring 6 Clamp 6a Upper wall 6b, 6c Side wall

Claims (8)

An annular shell having a leg along both sides of the support surface while projecting a support surface to an outer peripheral side in a cavity of the pneumatic tire while fitting the pneumatic tire to a rim of a wheel; A tire / wheel assembly in which a run flat support comprising an elastic ring supporting a leg on a rim is inserted, wherein a clamp portion for covering a joint of the elastic ring is provided on a leg of the annular shell. Three-dimensional. The tire / wheel assembly according to claim 1, wherein the clamp portion has a pair of side walls that sandwich the elastic ring, and one of the side walls has a wider covering width than the other. The tire / wheel assembly according to claim 1, wherein the clamp portion has a pair of side walls sandwiching the elastic ring, and a side wall inside the shell has a wider covering width than a side wall outside the shell. The tire-wheel assembly according to any one of claims 1 to 3, wherein a covering width of a side wall of the clamp portion is 10% or more and 50% or less of a radial height of the elastic ring. An annular shell having legs along both sides of the support surface while projecting the support surface to the outer peripheral side, and an elastic ring supporting the legs of the annular shell on a rim, A run-flat support provided with a clamp for covering the joint of the elastic ring. The run-flat support according to claim 5, wherein the clamp portion has a pair of side walls sandwiching the elastic ring, and one of the side walls has a wider coating width than the other. 6. The run-flat support according to claim 5, wherein the clamp portion has a pair of side walls sandwiching the elastic ring, and a side wall inside the shell has a wider covering width than a side wall outside the shell. The run flat support according to any one of claims 5 to 7, wherein a coating width of a side wall of the clamp portion is 10% or more and 50% or less of a radial height of the elastic ring.

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