JP2005145142A - Run flat support for tire/rim assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a run flat support applicable to a tire/rim assembly composed of a plurality of kinds of sizes with a run flat support of one size. <P>SOLUTION: This run flat support 1 is composed of an annular body 2 for supporting an inner peripheral surface of a pneumatic tire T, and elastic rings 3 and 3 for respectively supporting both left and right leg parts 2b and 2b of the annular body 2 by the rim R. The elastic ring 3 is composed of a ring body 3a connected to both left and right leg parts 2b and an ancillary ring 3b installed in the ring body 3a. When using the run flat support 1, the ancillary ring 3b is selectively installed on an outside surface and/or an inner peripheral surface of the ring body 3a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a run-flat support for a tire / rim assembly, and more particularly to a run-flat for a tire / rim assembly that enables safe running without causing rim disengagement when an abnormal drop in air pressure such as puncture occurs. It relates to a support.

  When a pneumatic tire is punctured while the vehicle is running, a run-flat support that supports the tire's inner peripheral surface is inserted into the cavity of the pneumatic tire to enable emergency traveling to a repair station such as a gas station. There are many proposals to do so (for example, see Patent Document 1). In these, an annular body that supports the inner peripheral surface of the tire is formed coaxially with the rim, and support elements are formed on both legs of the annular body, and the support elements are placed on the rim seat to support the annular body. It is configured.

  Therefore, there is an advantage that the wheel / rim configuration can be used as it is without substantial modification. However, such run-flat supports need to be prepared in different sizes depending on the size of the tire or rim to be mounted. Therefore, it is necessary to manufacture a variety of types and store and maintain them. There was a need.

  As a measure to improve such management complexity, the run flat support is composed of a pair of left and right run flat members and a rigid stopper that fixes these to the outer peripheral surface of the rim. There is a proposal to install by incorporating into a hollow portion of a pneumatic tire with a stopper for each size in common (see Patent Document 2).

However, even with such a proposal, the run-flat member can be used as it is when the tire or rim size changes, but the rigid stopper that is difficult to store and maintain has a shape that matches its inner peripheral surface with the outer peripheral surface of the rim. Therefore, it cannot be used together because it needs to be formed, and it was not always a satisfactory improvement measure.
JP-A-10-297226 JP 2002-240519 A

  An object of the present invention is to solve the above-mentioned conventional problems, and to provide a run flat support that can be applied to a tire / rim assembly having a plurality of sizes with a single size run flat support. It is in.

  To achieve the above object, a run flat support for a tire / rim assembly according to the present invention is incorporated inside a tire / rim assembly in which a pneumatic tire is assembled to a rim, and the inner peripheral surface of the pneumatic tire. A ring-flat support body comprising: an annular body supporting the annular body; and an elastic ring for supporting both left and right leg portions of the annular body on the rim, wherein the elastic ring is connected to the left and right leg portions. A main body and an auxiliary ring assembled to the ring main body, and the auxiliary ring is selectively attached to the outer surface and / or inner peripheral surface of the ring main body when the run flat support is used. It is a feature.

  The run flat support for a tire / rim assembly according to the present invention comprises an elastic ring comprising a ring main body connected to the left and right leg portions of an annular body and an incidental ring assembled to the ring main body. Since it is selectively mounted on the outer surface and / or the inner peripheral surface, a run-flat support having a plurality of types of elastic rings can be constructed from one size ring body. Therefore, it is not necessary to manufacture run-flat supports over all sizes, and the burden can be reduced from the viewpoint of managing them.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view illustrating a tire / rim assembly equipped with a run-flat support (hereinafter simply referred to as a run-flat support) according to an embodiment of the present invention, and FIG. 2 shows elasticity in the run-flat support. It is an enlarged view which shows the form of a ring.

  In FIG. 1, a tire / rim assembly (wheel) is configured by a pneumatic tire T having a bead portion B mounted on a rim sheet Rs of a rim R. A run flat support 1 is inserted inside the pneumatic tire T, and the run flat support 1 is an elastic body attached to an annular body 2 made of a shell and left and right leg portions 2b, 2b of the annular body 2. The elastic rings 3 and 3 are mounted so as to be placed inside the bead portions B and B on the left and right rim seats Rs and Rs. The run flat support 1 is separated from the inner wall surface of the pneumatic tire T during normal running, but supports the collapsed pneumatic tire T from the inside during puncture.

  The annular body 2 has a continuous support surface 2a for supporting a punctured tire on the outer peripheral side (radially outer side) and a shell structure including leg portions 2b and 2b extending inward from both sides of the support surface 2a. It has become. The elastic rings 3 and 3 that support the annular body 2 on the rim R sandwich the bead portions B and B of the pneumatic tire T between the rim flanges Ra and Ra.

  The annular body 2 is made of a rigid material to support the vehicle weight via the punctured pneumatic tire T. For the constituent material, metal, hard resin, or the like is used. Among these, steel, aluminum, etc. are used as a metal, and a thermoplastic resin or a thermosetting resin is used as a hard resin. Nylon, polyester, polyethylene, polypropylene, polystyrene, polyphenylene sulfide, ABS resin or the like is used as the thermoplastic resin, and epoxy resin or unsaturated polyester resin is used as the thermosetting resin.

  The elastic ring 3 relieves the impact and vibration received by the annular body 2 from the punctured pneumatic tire T, and prevents the rim seat Rs from slipping to stably support the annular body 2. As shown in FIG. 2, the elastic ring 3 is composed of a ring main body 3a attached to the leg 2b of the annular body 2 and an accompanying ring 3b assembled to the ring main body 3a. Moreover, the recessed part 4 and the convex part 5 are each provided in the inner peripheral surface of the ring main body 3a, and the outer peripheral surface of the incidental ring 3b, and a predetermined positional relationship is maintained by mutually fitting.

  As a constituent material of the elastic ring 3, at least one selected from rubber, resin, and a composite thereof is used. As rubber, natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber (SBR), butadiene rubber (BR), hydrogenated NBR, hydrogenated SBR, ethylene propylene rubber (EPDM, EPM), butyl rubber (IIR) ), Acrylic rubber (ACM), chloroprene rubber (CR) silicone rubber, fluorine rubber and the like are used. The materials constituting the ring body 3a and the accompanying ring 3b are preferably the same, but may be different as required. The elastic modulus and hardness of the ring main body 3a and the incidental ring 3b are preferably the same, but may be different as necessary. As the hardness, the JIS-A hardness according to JIS K6253 is preferably 95 or less. If the hardness exceeds JIS-A hardness 95, the function as an elastic ring is lowered, and the mountability to the rim R is lowered.

  The run-flat support body 1 of the present invention comprises a ring body 3a to which an annular body 2 is attached as described above, and an incidental ring 3b that is independent from the annular body 2, before being attached to a tire / rim assembly. Are prepared as separate parts separated from each other. Therefore, the elastic ring 3 has an accessory ring 3b having a predetermined height h1 on the inner peripheral surface of the ring body 3a according to the rim diameter of the rim R so as to match the size of the tire T or rim R to be mounted. By selectively fitting, the inner diameter is changed from D1 to D2, and the rim R of the hollow portion of the pneumatic tire T is mounted on the rim sheet Rs.

  Further, as illustrated in FIG. 3, two or more kinds of incidental rings 3b and 3b having different diameters h2 and h3 are connected to the inner periphery of the ring body 3a so as to be fitted to each other as the incidental ring 3b. If it is selectively fitted to the surface, it is possible to obtain a run-flat support 1 that can be mounted on three or more rims R having different rim diameters.

  Further, depending on the form of the tire T or rim R, the rim sheet Rs may be an inclined surface. Even in such a case, in the same manner as described above, as illustrated in FIG. 4, the rim R having a different rim diameter can be obtained by fitting the incidental ring 3 b having an inner peripheral surface that matches the inclined surface of the rim R. Can respond.

  In the example described above, the case where the one-size run-flat support 1 is applied to a plurality of types of rims R having different rim diameters has been described, but the same applies to a plurality of types of rims R having different rim widths. be able to.

  The example of FIG. 5 shows a case where the incidental ring 3b is fitted to the outer surface of the ring body 3a to which the leg 2b of the annular body 2 is attached. When the ring body 3a is used alone without attaching the incidental ring 3b, it is applied to the rim R in which the width between the inner side surfaces of both bead portions B and B after assembling the rim becomes W1. For the rim R in which the width between the inner side surfaces of both bead parts B, B after assembly is W2, the incidental ring 3b having the same inner diameter and different outer diameter on the outer surface of the ring body 3a. Fit and apply. In addition, when the intensity | strength of the elastic ring 3 is insufficient here, as shown by the broken line in a figure, you may make it fit the incidental ring 3b to the inner surface of the ring main body 3a.

  6 and 7 show that the accessory ring 3b is fitted to the rim R having a different rim width and / or rim diameter by fitting the accessory ring 3b having an inner peripheral surface that matches the inclined surface of the rim R. The case where it fits in the ring main body 3a is shown. FIG. 6 shows a case where the rim is applied to a rim R having a different rim width, and FIG. 7 shows a case where the rim is applied to a rim R having a different rim width and rim diameter.

  FIG. 8 illustrates a case where the left and right elastic rings 3 and 3 are configured differently according to the configuration of the rim R. As shown in the figure, when the outer peripheral diameters D1 and D2 of the left and right rim seats Rs of the rim R are different, the accessory ring 3b is not attached to one of the main body rings 3a, or the left and right main body rings 3a and 3a are high. It is preferable to attach the incidental rings 3b having different sizes to the rim R.

  In the present invention, the number of incidental rings 3b combined with one set of ring main bodies 3a is not limited to one, but two or more may be combined. That is, in the case of a run flat support applied to a plurality of rims having different rim diameters, as illustrated in FIG. 3, two or more incidental rings 3b having different diameters can be combined, and a plurality of rim widths having different rim widths can be combined. In the case of a run flat support applied to the rim, two or more incidental rings 3b having the same or different width w as shown in FIG. 5 can be combined.

  Moreover, in this invention, it is preferable to fix the fitting surface of the ring main body 3a and the incidental ring 3b with an adhesive agent etc. Moreover, it is preferable to indicate the tire size and rim size to be applied to the ring main body 3a and the incidental ring 3b combined as one set for convenience of fitting or mounting. As a result, it is possible to prevent troubles at the time of wearing and to facilitate storage and maintenance.

  Pneumatic tires with a tire size of 225 / 50R17 with five different rim widths (rim diameter: 17 ", rim width: 6", 6 1/2 ", 7", 7 1/2 ", 8") The run-flat support body 1 having the symmetrical shape of the left and right elastic rings 3 and 3 was manufactured.

  In order to manufacture this, a run-flat support body to be attached to a rim having a rim width of 6 ″ (invention A) and a run-flat support to be attached to two types of rims having a width of 6 ″ and 7 ″ are prepared. Table 1 shows the number of molds required to produce these run-flat supports for the case where the body was manufactured (Invention B), which was compared with the case where the conventional method was used (conventional example).

  That is, when a run-flat support is manufactured by a conventional method (conventional example), it corresponds to the number of rim widths (6 ″, 6 1/2 ″, 7 ″, 7 1/2 ″, 8 ″). Five molds are required.

  On the other hand, in the present invention A, the run-flat support body 1 to be mounted on a rim having a width of 6 ″ is manufactured in advance, and the outer surfaces of the left and right ring bodies 3a are made to correspond to the rim having a width of 6½ ″. 1/4 "wide accessory rings 3b were fitted to each other. Similarly, in order to correspond to the rims having widths of 7", 7 1/2 ", and 8", the outer side surfaces of the left and right auxiliary rings 3b were further fixed. The accessory rings 3b each having a width of 1/4 "were fitted together. Therefore, the number of molds required for manufacturing the run-flat support 1 was one for the run-flat support (for rim width 6"). There was a total of two for the accessory ring (1/4 "wide).

  On the other hand, in the present invention B, the run-flat support body 1 to be mounted on the rim having a width of 6 ″ and 7 ″ is manufactured in advance, and the rim width 6 ″ is mounted to correspond to the rim having a width of 6½ ″. A 1/4 "wide accessory ring 3b was fitted to the outer surface of each of the left and right ring bodies 3a of the run flat support 1. Similarly, a rim width of 7" to correspond to the width of 7 1/2 " An accessory ring 3b having a width of 1/4 "was fitted to the outer side surfaces of the left and right ring bodies 3a of the run-flat support 1 for mounting. Further, in order to correspond to the rim having a width of 8 ″, an additional ring 3b having a width of 1/4 ″ was fitted to the outer surface of each of the left and right auxiliary rings 3b. Therefore, the number of molds required to manufacture the run-flat support 1 is two for the run-flat support (for rim widths 6 "and 7") and one for the accessory ring (width 1/4). ") 3 in total.

  As illustrated in Table 1, the support 1 of the present invention enables the combined use of the run-flat support 1 between a plurality of sizes. However, it is only necessary to store and maintain the run-flat support 1 of a limited size and several types of incidental rings 3b (in the above example, one type of incidental ring having a width of 1/4 "). This is far more advantageous than when each run-flat support 1 is stored and maintained.

1 is a cross-sectional view showing an example of a tire / rim assembly with a run-flat support body according to an embodiment of the present invention mounted thereon. It is an enlarged view which shows the form of the elastic ring in the run flat support body of this invention. It is an enlarged view which shows the other form of the elastic ring in the run flat support body of this invention. It is an enlarged view which shows the further another form of the elastic ring in the run flat support body of this invention. It is an enlarged view which shows the further another form of the elastic ring in the run flat support body of this invention. It is an enlarged view which shows the further another form of the elastic ring in the run flat support body of this invention. It is an enlarged view which shows the further another form of the elastic ring in the run flat support body of this invention. It is an enlarged view which shows the further another form of the run flat support body of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Run flat support body 2 Ring body 2a Support surface 2b Leg part 3 Elastic ring 3a Ring main body 3b Auxiliary ring T Pneumatic tire R Rim

Claims (6)

An annular body that is incorporated inside a tire / rim assembly in which a pneumatic tire is assembled to a rim, and that supports an inner peripheral surface of the pneumatic tire, and an elastic ring that supports both left and right leg portions of the annular body on the rim, respectively. In a run flat support composed of:
The elastic ring includes a ring main body connected to the left and right leg portions and an auxiliary ring assembled to the ring main body, and the auxiliary ring is attached to an outer surface and / or an inner surface of the ring main body when the run flat support is used. A run-flat support for a tire / rim assembly that is selectively mounted on a peripheral surface.   The run-flat support for a tire / rim assembly according to claim 1, wherein the annular body is formed of a metal or resin shell.   The run-flat support for a tire / rim assembly according to claim 1 or 2, wherein the elastic ring body and the accompanying ring of the elastic ring are made of at least one selected from rubber, resin, and a composite thereof.   The tire / rim assembly according to claim 1, 2 or 3, wherein a mutual fitting portion is provided on the ring main body and the incidental ring, and the ring main body and the incidental ring are attached at a predetermined correlation position via the fitting portion. Run flat support.   The run-flat support for a tire / rim assembly according to any one of claims 1 to 4, wherein a tire size and a rim size to be applied are indicated on the elastic ring main body and the accompanying ring. A pneumatic tire equipped with the run flat support for a tire / rim assembly according to any one of claims 1 to 5.

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