JPH05155206A - Rim assembly for pneumatic tire and rim protector thereof - Google Patents

Abstract

PURPOSE:To provide the rim assembly of a pneumatic tire which can get the effect of protecting a rim flange without hindering the rim assembling property, and provide its rim protector. CONSTITUTION:A circular rubber protecting material 3, which constitutes a rim protector, is trapezoid in cross section, and plural pieces are attached later after assembling, to the region from the contact part A with a rim flange 1a at the side of a pneumatic tire 2 to the tire largest width part B. The rubber protective material 3 is projecting in width direction of the tire from the rim flange 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pneumatic tire for protecting a rim flange when a flat pneumatic tire is mounted.
The present invention relates to a rim assembly and its rim protector.

[0002]

2. Description of the Related Art Generally, a flat pneumatic tire has a low section height. For this reason, when a flat pneumatic tire is assembled on a rim, the rim flange is in a state of protruding from the maximum tire width, and there is a drawback that the rim flange is liable to come into contact with a curbstone or the like during traveling.

Therefore, in order to protect the rim flange,
A flat pneumatic tire has been proposed in which a rubber volume portion that protrudes in the tire width direction from the rim flange in the assembled state of the rim is integrally formed on the side portion.

[0004]

However, when the flat pneumatic tire having the above-described conventional rubber volume portion is mounted on the rim having the maximum rim width within the allowable range of the tire size, the rubber is The amount of protrusion of the volume portion becomes very small, or the rim flange protrudes more than the rubber volume portion, so that the rim flange cannot be sufficiently protected. As described above, the conventional flat pneumatic tire having the rubber volume portion has a problem that it cannot cope with a change in the rim width. Also,
If the rubber volume is made thicker in order to obtain a sufficient protection effect for the rim flange, the fitting pressure during rim assembly rises,
The rim assembly performance will be reduced.

An object of the present invention is to provide a pneumatic tire / rim assembly and a rim protector thereof which can sufficiently obtain the protective effect of the rim flange without impairing the rim assembling property.

[0006]

A pneumatic tire / rim assembly according to the present invention is provided with a rim flange in a side region from a contact portion with a rim flange of a rim-assembled pneumatic tire to a tire maximum width portion. Also, it is characterized in that a plurality of arc-shaped rubber protective materials protruding in the tire width direction are retrofitted and attached.

Further, the rim protector according to the present invention is
It is composed of an arc-shaped rubber protective material that is attached afterward to the side area from the contact portion with the rim flange of the rim assembled pneumatic tire to the tire maximum width portion and projects in the tire width direction from the rim flange. It is a feature. In the present invention, the arc-shaped rubber protective material is a side region from the contact portion with the rim flange of the rim-assembled pneumatic tire to the tire maximum width portion, that is, the side portion of the pneumatic tire is annularly formed in plural units. Retrofitted.
Therefore, since it is not necessary to use a pneumatic tire in which a rubber volume portion is integrally formed on the side portion, the fitting pressure at the time of assembling the rim does not increase and the rim assembling property is not impaired. Further, the rubber protective material can be appropriately selected according to the relationship between the tire size and the rim width, and therefore can be made to protrude in the tire width direction from the rim flange when retrofitted. Therefore, regardless of the relationship between the tire size and the rim width, a sufficient protection effect for the rim flange can be obtained. Further, the rubber protection material has an advantage that it can be easily replaced when it is damaged.

In the present invention, the rubber protective material is an annular rubber material divided into a plurality of pieces at a central angle of 180 ° or less. It is preferable that the plurality of arc-shaped rubber protective materials are mounted over an angle of 80% or more of the side portion in order to sufficiently obtain the protective effect of the rim flange. In this case,
The mounting interval of each rubber protective material is not particularly limited as long as the above conditions are satisfied, and may be equal intervals or unequal intervals.

Further, the rubber protective material can be retrofitted to the side portion of the pneumatic tire by using an adhesive or the like. In this case, a side portion of the pneumatic tire and the rubber protective material are provided with a pair of recesses and protrusions, and the recesses and protrusions are engaged with each other, whereby the subsequent mounting position can be easily determined. At the same time, the mounting strength can be improved.

As the material of the rubber protective material, it is preferable to use a material softer than the side compound of the pneumatic tire in order to sufficiently obtain the protective effect of the rim flange. The cross-sectional shape of the rubber protective material is not particularly limited, and may be triangular, trapezoidal, semicircular, semielliptic, or the like. The rubber protective material according to the present invention is particularly preferably applied to a flat pneumatic tire having a flatness of 60% or less. In this case, it is possible to prevent the rim flange from coming into contact with the curbstone or the like, and it is possible to reliably protect the rim flange.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing a main part of a pneumatic tire / rim assembly (wheel) and its rim protector according to the present invention, and FIG. 2 is a side view thereof. In FIG. 1, the rim 1 has a rim width of 229 mm and has a rim flange 1a at the edge. The pneumatic tire 2 has a tire size of 235 / 40ZR17 and is mounted on the rim 1 so that the tire maximum width of the tire cross section is 249 mm.
Has become. The rubber protective material 3 (rim protector) has a trapezoidal cross section, and is attached to a side portion of the pneumatic tire 2 in a region from the contact portion A with the rim flange 1a to the tire maximum width portion B. Further, as shown in FIG. 2, the rubber protective material 3 has an arc shape in a side view, and four rubber protective materials 3 are attached to the side portions of the pneumatic tire 2. The side portion of the pneumatic tire 2 is provided with a convex portion 2a, the mounting surface of the rubber protective material 3 is provided with a concave portion 3a, and the convex portion 2a and the concave portion 3a are engaged with each other. The pneumatic tire 2 and the rubber protective material 3 are firmly joined by using an adhesive or the like.

According to this embodiment, since the rubber protective material 3 is retrofitted to the side portion of the pneumatic tire 2, the fitting pressure at the time of assembling the rim does not rise and the rim assembling property is impaired. There is no. Further, by selecting the rubber protective material 3 to be attached later according to the relationship between the tire size of the pneumatic tire 2 and the rim width of the rim 1, the rubber protective material 3 is made to project in the tire width direction beyond the rim flange 1a. Therefore, the protective effect of the rim flange 1a can be sufficiently obtained. Furthermore, if one of the rubber protective materials 3 is damaged, only the damaged one can be replaced.

FIG. 3 and FIG. 4 are sectional views of the essential parts showing a modification of the present invention. Since these modified examples are different only in the post-attaching method of the rubber protective material, the same components as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof will be omitted.
In FIG. 3, the concave portion 2 is provided on the side portion of the pneumatic tire 2.
b is provided, a convex portion 3b is provided on the mounting surface of the rubber protective material 3, and the concave portion 2b and the convex portion 3b are engaged with each other. Further, in FIG. 4, both the side portion of the pneumatic tire 2 and the mounting surface of the rubber protective material 3 have a flat shape. It is firmly joined. In this case, it is preferable that the joint surface of the side portion of the pneumatic tire 2 be as flat and smooth as possible so that the pneumatic tire 2 and the rubber protective material 3 can be easily joined.

[0014]

As described above, according to the present invention, the arc-shaped rubber protective material that constitutes the rim protector is located on the side from the contact portion with the rim flange of the pneumatic tire with the rim assembled to the tire maximum width portion. Since it is retrofitted to the region and protrudes in the tire width direction beyond the rim flange, a sufficient protection effect of the rim flange can be obtained regardless of the relationship between the tire size and the rim width. Further, since the rubber protective material is attached to the side portion of the pneumatic tire afterwards, the fitting pressure at the time of assembling the rim does not rise and the rim assembling property is not impaired.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a pneumatic tire / rim assembly and a rim protector thereof according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional view of essential parts showing another embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing still another embodiment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rim 1a rim flange 2 pneumatic tires 2a, 3b convex portion 3 rubber protective material 3a, 2b concave portion

Claims (2)

[Claims] 1. A plurality of arc-shaped rubber protective materials protruding in the tire width direction from the rim flange in a side region from a contact portion with a rim flange of a rim-assembled pneumatic tire to a tire maximum width portion. Pneumatic tire and rim assembly installed retrofit. 2. An arc-shaped rubber protective material which is retrofitted to a side region from a contact portion with a rim flange of a rim-assembled pneumatic tire to a tire maximum width portion and which projects in the tire width direction from the rim flange. Rim protector composed of.