JP4075984B2 - Tire / wheel assembly and run-flat support - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a tire / wheel assembly and a run-flat support, and more particularly, to a tire / wheel assembly and a run-flat used for the tire / wheel assembly used for improving the fit of the run-flat support to a rim. It relates to a support.
[0002]
[Prior art]
Many technologies have been proposed in response to market demands that enable emergency traveling of several hundred km even when a pneumatic tire is punctured while the vehicle is traveling. For example, in JP-A-10-297226 and JP-T-2001-519279, a support is mounted on a rim inside a hollow portion of a rim-assembled pneumatic tire, and a punctured tire is supported by the support. The thing which enabled the run flat driving | running | working by this is proposed.
[0003]
The run-flat support body includes an annular shell having an open leg structure in which an outer peripheral side is a support surface and an inner peripheral side is opened, and elastic rings are attached to both leg portions. And is supported on the rim. This run-flat support has the advantage that it can be used without disruption to the market because it can be used as is without any special modifications to existing wheels / rims.
[0004]
However, since the elastic ring described above is composed only of an elastic material such as rubber or elastic resin, it is difficult to ensure a high fitting force to the rim, and as a result, a high load that is constantly applied during run-flat traveling. Therefore, there is a problem that the elastic ring may skid and come off from the rim.
[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 can improve the fit of the run-flat support to the rim.
[0006]
[Means for Solving the Problems]
The tire / wheel assembly of the present invention that achieves the above object includes an annular support body that supports an inner surface of a pneumatic tire during run-flat travel in a hollow portion of the pneumatic tire mounted on a rim of a wheel having a hump . A run-flat support body provided with left and right elastic rings for supporting the support body on the rim is disposed on the inner periphery side, and the support body is formed as a support surface formed with a convex curved surface on the outer periphery side and the inner periphery side is In a tire / wheel assembly comprising a ring shell that is bifurcated in leg and the elastic ring is attached to the leg that is bifurcated in leg to constitute the run-flat support, the inner circumference of the elastic ring high core stiffness than the elastic ring on the side embedded in circular, the sectional shape of the elastic ring is formed in a rectangular cross-section and gradually narrow the thickness of the inner circumferential edge side at the inner peripheral end portion of the elastic ring To Jo, when mated the elastic ring to the rim, characterized in that the elastic ring made possible fit between the bead portion and the rim hump of the pneumatic tires attached.
[0007]
Further, the run-flat support body of the present invention is provided with left and right elastic rings for supporting the support body on the rim on the inner peripheral side of the annular support body that supports the inner surface of the pneumatic tire during run-flat travel , A run-flat comprising a support body having an annular shell having an outer peripheral side formed into a convex curved surface and having an inner peripheral side opened in a bifurcated shape, and the elastic ring is attached to the leg portion opened in the bifurcated shape. The elastic ring is a support body, and a core having a rigidity higher than that of the elastic ring is annularly embedded on the inner peripheral side of the elastic ring. When the elastic ring is fitted to the rim, the elastic ring is fitted between the bead portion of the pneumatic tire mounted on the rim and the hump of the rim. and characterized in that it was possible That.
[0008]
Thus, by arrange | positioning a cyclic | annular core to the inner peripheral side of an elastic ring, it can be fitted with a higher fitting force with respect to a rim | limb than before. Therefore, even if the elastic ring is constantly subjected to a high load during run flat traveling, it does not easily come off from the rim due to skidding, and therefore the fit of the run flat support to the rim can be improved. Moreover, since it becomes possible to make the thickness of an elastic ring thinner than before, it can be reduced in weight.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the tire / wheel assembly of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
FIG. 1 is a meridian cross-sectional view showing the main part of a reference example of a tire / wheel assembly (wheel) according to the present invention, wherein 1 is a rim on the outer periphery of the 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 body 3 are formed in an annular shape coaxially with the rotation center axis of the wheel as a center, and run-flats are formed in the hollow portion 2 A of the pneumatic tire 2 attached to the rim 1. A run-flat support body 3 that supports the inner surface 2a of the pneumatic tire 2 during travel is disposed.
[0011]
The run-flat support body 3 includes an annular shell (support body) 4 formed from a rigid material such as metal or resin to support the vehicle weight via a punctured tire, and the annular shell 4 as a rim 1. In order to provide stable support, the left and right elastic rings 5 and 5 are formed of an elastic material such as rubber or elastic resin.
[0012]
The annular shell 4 is formed to have an outer diameter smaller than the diameter of the inner surface 2a so as to maintain a constant distance from the inner surface 2a of the pneumatic tire 2, and two convex curved surfaces 6a and 6b are formed on the outer circumferential side of the shell width. It has an annular support surface 6 in the direction. The support surface 6 is separated from the inner surface 2a of the pneumatic tire 2 when the pneumatic tire 2 is normal, but supports the inner surface 2a that is crushed when punctured.
[0013]
On the inner peripheral side of the annular shell 4, both side walls are legged as leg portions 7 and 7, respectively, and elastic rings 5 and 5 having a rectangular cross section are attached to the inner peripheral side. These elastic rings 5 and 5 support the annular shell 4 by fitting and abutting on the left and right rim seats 1a and 1a to alleviate the impact and vibration received by the annular shell 4 from the punctured tire, as well as the rim seats 1a and 1a. The annular shell 4 is stably supported by preventing the slip. The inner diameters of the elastic rings 5 and 5 are formed to have substantially the same dimensions as the inner diameter of the bead portion of the pneumatic tire 2.
[0014]
On the inner peripheral side of the elastic rings 5, 5, cores 8, 8 having higher rigidity than the elastic rings 5, 5 are embedded in an annular shape along the inner peripheral ends of the elastic rings 5, 5. As described above, the ring-shaped cores 8 and 8 embedded in the inner peripheral portion are made of a rigid material such as a metal or a resin, and preferable examples of the metal include steel and aluminum.
[0015]
As the resin, either a thermoplastic resin or a thermosetting resin may be used. 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.
[0016]
Further, a configuration may be adopted in which a reinforcing cord made of a metal cord such as a steel cord or an organic fiber cord such as a nylon cord is wound. When the reinforcing cord is wound as described above, one reinforcing cord may be wound, or a plurality of bundles may be wound.
[0017]
As shown in FIG. 1, the run-flat support 3 is assembled to a wheel together with the pneumatic tire 2 while being inserted inside the pneumatic tire 2 to form a tire / wheel assembly. When this tire / wheel assembly is mounted on a vehicle and the pneumatic tire 2 is punctured while traveling, the punctured and crushed tire is supported by the support surface 6 of the run-flat support body 3. Enables run-flat driving.
[0018]
As described above, since the cores 8 and 8 are annularly embedded on the inner peripheral side of the elastic rings 5 and 5, it becomes possible to secure a higher fitting force with respect to the rim 1 than before, and the elastic ring during the run-flat running. 5 and 5 do not slide off from the rim 1 easily. In addition, since the cores 8 and 8 can be arranged in this way to obtain a high fitting force, the elastic rings 5 and 5 can be made thinner and lighter than before.
[0019]
FIG. 2 shows an example of the tire / wheel assembly of the present invention. In this embodiment, the cross-sectional shape of the elastic rings 5 and 5 formed in the above-described rectangular shape is the inner peripheral end side of the inner peripheral end portion 5x. Is made into a shape with a gradually reduced thickness. By making the inner peripheral end portion 5x thin in this way, when the elastic ring 5 is fitted to the rim 1, the bead portion 2X of the pneumatic tire 2 attached to the rim 1 having the hump 1X. And the hump 1X of the rim 1 can be fitted. Thereby, the fitting force of the elastic ring 5 to the rim 1 can be further increased.
[0020]
In the present invention, the annular shell 4 is made of a rigid material such as a metal or a resin as described above, and examples of the metal include steel and aluminum. Further, the resin may be either a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin include nylon and polyester, and 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.
[0021]
The elastic rings 5 and 5 may use any rubber or elastic resin as long as the annular shell 4 can be stably supported. Examples of the rubber include natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, and butyl rubber. Examples of the elastic resin include foamed resins such as foamed polyurethane.
[0022]
In the above embodiment, an example of the annular shell 4 including the support surface 6 having the two convex curved surfaces 6a and 6b has been shown. However, the number of the convex curved surfaces may be one, or three or more. Also good. Preferably, as shown in the figure, two or more are formed so that the contact portions of the support surface 6 with the inner surface 2a of the pneumatic tire 2 are dispersed to two or more, and local wear applied to the inner surface 2a is reduced. In order to reduce, the continuous distance which enables run-flat driving | running | working can be extended.
[0024]
【The invention's effect】
As described above, according to the present invention, since the core having rigidity higher than that of the elastic ring is annularly embedded on the inner peripheral side of the elastic ring, the fitting force of the run-flat support body to the rim can be increased to improve the fitting property. it can.
[Brief description of the drawings]
FIG. 1 is a meridian cross-sectional view of a reference example of a tire / wheel assembly according to the present invention.
FIG. 2 is an enlarged cross-sectional view showing a main part of a tire / wheel assembly according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rim 2 Pneumatic tire 2A Hollow part 2a Inner surface 3 Run-flat support body 4 Annular shell (support body)
5 Elastic ring 6 Support surface 7 Leg 8 Core

Claims (2)

Left and right supporting the support body on the rim on the inner peripheral side of the annular support body that supports the inner surface of the pneumatic tire during run-flat running in the hollow portion of the pneumatic tire attached to the rim of the wheel having a hump A run-flat support body provided with an elastic ring is arranged, and the support body is a support surface having a convex curved surface on the outer peripheral side and an annular shell with an inner peripheral side opened in a bifurcated shape. In a tire / wheel assembly in which the run-flat support body is configured by attaching the elastic ring to an open leg portion, a core having a higher rigidity than the elastic ring is embedded in an annular shape on the inner peripheral side of the elastic ring. The cross-sectional shape of the elastic ring formed into a rectangular cross-section is mounted when the elastic ring is fitted to the rim, with the inner peripheral end side of the elastic ring having a gradually reduced thickness on the inner peripheral end side. Pneumatic tire / wheel assembly in which the elastic ring to be fitted in between the bead portion and the rim of the hump of the tire. Left and right elastic rings that support the support body on the rim are provided on the inner peripheral side of the annular support body that supports the inner surface of the pneumatic tire during run-flat travel, and the support body is formed with a convex curved surface on the outer periphery side. A run-flat support body comprising a ring-shaped shell having a bifurcated leg on the inner peripheral side, and the elastic ring being attached to the leg part having the bifurcated leg. A core with a rigidity higher than that of the elastic ring is embedded in the periphery, and the cross-sectional shape of the elastic ring formed into a rectangular cross section is formed. The inner peripheral end of the elastic ring is gradually reduced in thickness. When the elastic ring is fitted to the rim, the run-flat support body can be fitted between the bead portion of the pneumatic tire attached to the rim and the hump of the rim.

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