JP4170063B2 - Assembly of pneumatic tires and wheels for passenger cars - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the assembled rim flange diameter formed by assembled rim car pneumatic tire for ride big wheel conventionally.
[0002]
[Prior art]
In recent years, pneumatic tires for passenger cars have a tendency to flatten due to demands for higher output and higher handling stability of passenger cars, and the sectional height of the flat tire tends to become lower as the flatness ratio decreases. . A wheel in which such a flat tire is rim-assembled to a wheel has an image of a sports tire and has high fashionability, and therefore has attracted attention in terms of design other than tire performance.
[0003]
On the other hand, when a wheel with a tire rim assembled is mounted on a vehicle and the vehicle travels on a general road having a curb or the like on the shoulder of the road, the wheel may accidentally touch the curb. At this time, particularly in a tire having a small flatness ratio, the flange portion of the rim is likely to come into contact with the curb and the flange portion of the rim is likely to be deformed.
[0004]
For this reason, in order to protect the rim flange from curbstones, etc., a bulging portion (so-called rim protector) protruding outward in the tire rotation axis direction from the edge of the rim flange is provided in the vicinity along the edge of the rim flange. A pneumatic tire provided in a portion is known (for example, see Patent Document 1).
[0005]
Such a rim protector is designed in accordance with the conventional rim shape (the height of the standard rim flange is 14 to 22 mm). For example, the rim protector is 25 mm outward in the tire radial direction from the nominal rim diameter of the wheel. A rim protector having a vertex placed at a position and a height of 2 to 5 mm is known (see, for example, Patent Document 2).
[0006]
[Patent Document 1]
Utility Model Registration No. 2599473 (first page, FIG. 1)
[Patent Document 2]
JP 2001-171318 A (page 3, FIG. 2)
[0007]
[Problems to be solved by the invention]
However, the above-described flat tire has drawbacks such that the load capacity decreases as the tire internal volume decreases. For this reason, a method for improving the design performance of the wheel as described above is being developed without reducing the flatness of the pneumatic tire. For this reason, it is conceivable that the diameter of the rim flange will increase in the future. However, with the conventional rim protector, the protection function of the rim flange cannot be obtained, and the rim assembly may not be performed.
[0008]
An object of the present invention, the rim flange diameter is not assembled rim and pneumatic tire to larger wheels than the prior art, an assembly body protection rim flange good passenger car pneumatic tires and wheels It is to provide.
[0009]
[Means for Solving the Problems]
The above object can be achieved by the present invention as described below.
That is, the assembly of the pneumatic tire and wheel for a passenger car of the present invention includes a pair of annular bead portions, sidewall portions extending from the bead portions to the outer peripheral side, and outer peripheral sides of the sidewall portions. In an assembly in which a pneumatic tire for a passenger car having a tread portion that is connected to each other via a shoulder portion is assembled on a wheel , at least one side wall portion is in contact with the outer peripheral curved surface of the rim flange. It has an annular bulging portion having an inner peripheral side surface that can suppress deformation of the sidewall portion in contact with the bulging portion, and the bulging portion is located at a height of 55 mm or more with respect to the nominal diameter. height from wall extension line Ri der than 3 mm, the height relative to the nominal diameter of the positions of the vertices of the bulging portion is riding a 41 to 61% with respect to the tire section height A pneumatic tire for a vehicle is assembled on a wheel having a rim flange having a height of 55 mm or more with respect to a nominal diameter on the outside, and the rim flange extends from a bead portion of the pneumatic tire for a passenger vehicle to a sidewall. An assembled body of a pneumatic tire for a passenger car and a wheel , characterized in that the position of the apex of the bulging portion is 0 to 4 mm higher than the rim flange .
[0010]
In the present invention, the nominal diameter is a nominal diameter determined according to the size of the rim and the tire, and the diameter of the bead seat of the rim is determined by this diameter, and the tire is designed according to this diameter. Furthermore, the apex of the bulging portion refers to a position where the height from the arc extending from the outer wall of the side wall portion with the curvature of the outer wall of the tire meridian section is the largest. In addition, the dimensions of each part indicate dimensions in a state where the air pressure determined by JATMA is set according to the tire size after being mounted on the rim.
[0013]
[Function and effect]
According to the present invention, a pneumatic tire for a passenger car in which the apex of the bulging portion corresponding to the rim protector is 55 mm or more higher than the nominal diameter and the height from the sidewall extension line is 3 mm or more is used. Since the rim is assembled on a wheel having a rim flange having an outer height of 55 mm or more on the outside, the protection function of the rim flange is also improved . In addition, when the height of the rim flange is large, contact / abrasion with the rim flange due to deformation of the sidewall portion is likely to occur. Since it has an inner peripheral side surface capable of suppressing deformation, the contact and wear can be effectively suppressed. Furthermore, the bulging part which has the said inner peripheral side surface can suppress the deformation | transformation of a sidewall part, and can also improve the exercise | movement performance of a tire.
[0014]
In the present invention, the height based on the nominal diameter at the apex position of the bulging portion is 41 to 61% with respect to the tire cross-section height, and the appearance is the same as that of a tire with a flatness ratio of 20 to 30%. As a result, an image of a sports tire is produced and fashionability is also high. In addition, since the tire internal volume can be sufficiently secured, the load capacity of the tire can be sufficiently maintained.
[0015]
In the present invention, a wheel having an outer rim flange having a height of 55 mm or more is used, and the position of the apex of the bulging portion is 0 to 4 mm higher than the rim flange. As a result, it is possible to effectively prevent the foreign matter such as sand from entering between the wheel and the tire during traveling.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a tire meridian illustrating an example of an assembly of a pneumatic tire for a passenger car and a wheel according to the present invention. FIG. 2 is a cross-sectional view showing a main part in the vicinity of the side wall.
[0017]
As shown in FIG. 1, the pneumatic tire used in the assembly of the present invention includes a pair of annular bead portions 1, sidewall portions 2 extending from the bead portions 1 to the outer peripheral side, and sidewall portions 2. The tread part 4 which connects each outer peripheral side end of this through the shoulder part 3 is provided. This structure is the same as a general tire, and the present invention can be applied to any tire having the structure. Moreover, in such a pneumatic tire, it is not always necessary to have a radial tire structure, and a bias tire or a carcass layer 5 with a partially inclined cord may be used.
[0018]
The bead portion 1 is provided with a bead 1a and a bead filler 1b, which are bead wire bundling bodies surrounded by the carcass layer 5, and the end portion of the carcass layer 5 is rewound and locked by the bead 1a. The tire is firmly fitted onto the rim 20 in a state where the space between the bead portions 1 is reinforced by the carcass layer 5. Rubber layers are formed on both sides of the carcass layer 5, and in the tubeless tire, an inner liner layer is formed as the innermost layer. In addition, a belt layer 6 that reinforces the carcass effect is disposed on the outer peripheral portion of the carcass layer 5, and a tread pattern is formed by a tread rubber on the outer peripheral surface thereof.
[0019]
Examples of the raw rubber for the rubber layer include natural rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), and butyl rubber (IIR). These rubbers are reinforced with fillers such as carbon black and silica, and a vulcanizing agent, a vulcanization accelerator, a plasticizer, an antiaging agent, and the like are appropriately blended.
[0020]
Further, a steel wire or the like is used as the bead wire, and steel, organic fibers such as polyester, rayon, nylon, and aramid are used as the constituent material of the carcass layer 5 and the belt layer 6. These materials are usually subjected to surface treatment, adhesion treatment or the like in order to improve adhesion to rubber.
[0021]
The pneumatic tire used for the assembly of the present invention includes an annular bulging portion 11 that functions as a rim protector on at least one side wall portion 2. The bulging portions 11 may be provided on the sidewall portions 2 on both sides. In this case, the bulging portions 11 on both sides may have different formation positions and shapes. That is, the pneumatic tire used for the assembly of the present invention may have a left-right asymmetric structure, in which case it is a mounting direction designation type tire. This mounting direction designation type tire designates which side of the tire faces the outside of the vehicle when it is mounted on the rim 20.
[0022]
The bulged portion 11 has an inner peripheral side surface 11 a that abuts against the outer peripheral curved surface 21 a of the rim flange 21 and can suppress deformation of the sidewall portion 2. The inner peripheral side surface 11a of the bulging portion 11 may always be separated from the outer peripheral side curved surface 21a of the rim flange 21, and when the tire deforms during running, the inner peripheral side surface 11a of the bulging portion 11 It is only necessary that the deformation of the sidewall portion 2 can be suppressed by contacting the outer peripheral curved surface 21a. In the present embodiment, an example in which the inner peripheral side surface 11a of the bulging portion 11 is always in contact with the outer peripheral side curved surface 21a is shown.
[0023]
The bulging portion 11 has a vertex P1 located at a height R1 of 55 mm or more on the basis of the nominal diameter NR, and the vertex P1 is located 0 to 4 mm higher than the height HR of the rim flange 21 of the wheel 20 to be used. Located .
[0024]
At that time, the height based on the nominal diameter NR at the position of the apex P1 of the bulging portion 11 is 41 to 61% with respect to the tire cross-section height H2 . In addition, it is preferable that the position of the apex P1 of the bulging portion 11 is disposed closer to the tire outer periphery side than the position of the tire maximum width.
[0025]
The apex of the bulging portion 11 has a height H1 from the sidewall extension line of 3 mm or more, preferably 10 to 15 mm. Here, the height H1 means a height from an arc extending from the outer wall 2a with the curvature SR of the outer wall 2a of the sidewall portion 2 in the tire meridian cross section.
[0026]
The cross-sectional shape of the bulging part 11 may be any of a substantially triangular shape, a substantially trapezoidal shape, a substantially semicircular shape, a substantially crescent shape, etc., but is preferably a substantially triangular shape. Moreover, the shape of the inner peripheral side surface 11a of the bulging portion 11 may be a shape bulging outward from a straight line drawn from the apex P1 to the outer wall 2a of the sidewall portion 2, or conversely a shape constricted to the inner side. When the inner peripheral side surface 11a of the bulging portion 11 is constricted inward, the curvature radius PR is preferably 3 to 30 mm, more preferably 5 to 20 mm, from the fit to the outer peripheral side curved surface 21a of the rim flange 21. More preferred.
[0027]
About the hardness of the rubber | gum of the bulging part 11, 45-85 degrees are preferable for the hardness of the rubber which comprises the bulging part 11 in JISA hardness. At that time, rubber may be reinforced with short fibers or reinforced with long fibers.
[0028]
A pneumatic tire for a passenger car in the assembly of the present invention, the height relative to the is nominal diameter is set rim wheel having a rim flange is 55mm or more outwardly. FIG. 3 shows the mounting state on such a wheel. As shown in this figure, most of the sidewall portion 2 is hidden by the rim flange 21 of the rim 20, and only the remaining sidewall portion 2 and the bulging portion 11 are tire portions in a front view. For this reason, since the appearance is the same as that of a tire having a considerably low flatness ratio, an image of a sports tire is generated, and fashionability is also high.
[0029]
In addition, it is preferable from the viewpoint of maintaining the rim assembly property that the rim flange on the other side has the same height as the conventional one. Therefore, the shape of the wheel is different from the conventional wheel in that only the outer rim flange is formed higher.
[0030]
[Other Embodiments]
(1) In the above-described embodiment, an example in which the inner peripheral side surface of the bulging portion is always in contact with the outer peripheral side curved surface of the rim flange has been shown. However, in the present invention, as shown in FIG. 11 may be separated from the outer peripheral curved surface 21 a of the rim flange 21. Also in this case, it is preferable that the apex P1 is located at a position 0 to 4 mm higher than the height HR of the rim flange 21 of the wheel 20 to be used.
[0031]
(2) In the above-described embodiment, the example in which the tire structure of the portion inscribed in the outer rim flange is the same as the conventional tire structure is shown. However, in the present invention, the structure of this portion may be different from the conventional one.
[0032]
For example, since the reinforcement around the bead is performed by the rim flange, the hardness of the bead filler may be reduced or the height may be lowered. In order to reduce contact and wear with the rim flange, a rubber layer having a JIS A hardness of 65 to 90 ° may be provided on the surface of the sidewall portion. Further, a structure in which a reinforcing layer made of steel cord or nylon cord is arranged around the bead may be used.
[Brief description of the drawings]
FIG. 1 is a tire meridian cross-sectional view showing an example of use of an assembly of the present invention. FIG. 2 is a cross-sectional view of a main part showing a main part in the vicinity of a sidewall part of the tire in FIG. cross sectional view showing a main part of another example of the assembly of the front view [FIG. 4] the present invention showing the use state of an example of the assembled unit [description of symbols]
DESCRIPTION OF SYMBOLS 1 Bead part 2 Side wall part 3 Shoulder part 4 Tread part 11 Bumped part 11a Inner peripheral side surface 20 Rim 21 Rim flange 21a Outer peripheral side curved surface NR Nominal diameter PR Curvature radius SR of inner peripheral side surface Curvature of outer wall of side wall part Radius P1 Apex R1 Height from nominal diameter H1 Apex height HR Rim flange height

Claims (1)

A pneumatic tire for a passenger car comprising a pair of annular bead portions, a sidewall portion extending from the bead portion to the outer peripheral side, and a tread portion connecting the outer peripheral side ends of the sidewall portions via a shoulder portion. In the assembly that is assembled to the wheel rim ,
At least one side wall portion is provided with an annular bulging portion having an inner peripheral side surface that can be in contact with the outer peripheral curved surface of the rim flange to suppress deformation of the sidewall portion, and the bulging portion has a nominal diameter. was located vertex to 55mm or more in height as a reference, Ri height der least 3mm from the sidewall extension of the vertex, the height relative to the nominal diameter of the positions of the vertices of the bulging portion A pneumatic tire for a passenger car having a tire cross-section height of 41 to 61% is assembled on a wheel having a rim flange having an outer height of 55 mm or more based on a nominal diameter, flange abuts over sidewall portion from the bead portion of the pneumatic tire for the passenger car, the position of the apex of the bulging portion is equal to or 0~4mm higher than the rim flange Assembling body of the pneumatic tire and wheel for car use.

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