JP4316277B2 - Tire wheel and pneumatic tire / wheel assembly - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembly of a tire wheel and a pneumatic tire and a wheel, more specifically, tire wheel and pneumatic with improved rim assembling workability without inhibiting the air seal resistance and rim deviation resistance The present invention relates to an assembly of a tire and a wheel.
[0002]
[Prior art]
Generally, in a wheel for incorporating a pneumatic tubeless tire, a protrusion called a hump-like hump is formed on the inner surface of the rim sheet so as to prevent the tire bead portion from slipping inward in the tire axial direction from the rim. Is formed along the tire circumferential direction. Therefore, if the tightening force of the bead part is too large, the bead part will drop from the inside of the rim seat toward the outside while increasing the internal pressure when the rim is assembled. Receives great resistance by being caught in
[0003]
On the other hand, if the tightening force of the bead portion is reduced in order to reduce the resistance of the hump portion as described above, that is, if the inner diameter of the bead portion is increased, the air sealability and the rim displacement resistance are deteriorated. Accordingly, the rim assembly workability, the air sealability, and the rim displacement resistance are in a contradictory relationship.
[0004]
Conventionally, many proposals for satisfying both of these characteristics have been made (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-10-193927 (pages 1 to 3, FIGS. 1 to 5)
[0006]
[Problems to be solved by the invention]
However, none of these proposals has yet reached a sufficient solution to satisfy the contradictory relationship described above (particularly, rim assembly workability).
[0007]
An object of the present invention, such conventional to solve the problems, to improve the rim assembling workability without inhibiting the air seal resistance and rim deviation resistance, tire wheel and to be compatible both properties contradictory and An object is to provide an assembly of a pneumatic tire and a wheel.
[0008]
[Means for Solving the Problems]
The tire wheel of the present invention is a tire wheel having a rim seat surface into which a bead portion of a pneumatic tire is incorporated, and a protruding hump portion extending in the circumferential direction on the rim seat surface. Forming a concave-convex shape in which a plurality of concave portions are arranged along the direction, and the pitch between the concave portions of the concave-convex shape is set to 0.5 to 10% of the circumferential length of the rim sheet surface, and the bottom surface of the concave portion and the top of the convex portion The amplitude between the surfaces is 20 to 90% of the height of the hump portion. Further, the pneumatic tire and wheel assembly of the present invention has a pair of bead portions, and forms a concavo-convex shape in which a plurality of concave portions are arranged along the tire circumferential direction on the heel portion of the bead portion, The pitch between the concave and convex portions of the concavo-convex shape is 0.5 to 10% of the circumference of the bead sheet surface, the amplitude between the bottom surface of the concave portion and the top surface of the convex portion is 0.5 to 5 mm, and the bead A pneumatic tire in which the length in the tire axial direction of the uneven shape on the seat surface is 5 to 60% of the length from the inner surface of the rim flange to the center of the bead core is incorporated in the tire wheel described above .
[0009]
In this manner, a pneumatic tire having a concave and convex shape having a predetermined pitch and amplitude is formed in the hump portion of the tire wheel, and a predetermined concave and convex shape is formed in the heel portion of the bead portion corresponding to the concave and convex shape. Therefore, when assembling a pneumatic tire with a rim, the concave portion formed in the heel portion is pulled in the circumferential direction, so that the apparent inner length of the bead portion increases, and the bead portion easily gets over the hump portion. Therefore, the rim assembling workability is improved, and the air sealing performance and the rim displacement resistance are not hindered without reducing the tightening force of the bead portion.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description is omitted.
[0015]
FIG. 1 is a half sectional view showing an example of an assembly (hereinafter referred to as an assembly) of a pneumatic tire and a wheel according to the present invention. The pneumatic tire T constitutes an assembly 1 by incorporating a pair of bead portions 2 and 2 into a rim seat surface 3 a of a wheel W. On the bead seat surface 3a of the wheel W, a protruding hump portion 4 extending in the circumferential direction is formed on the inner end side in the tire axial direction.
[0016]
The heel portion H of the bead portion 2 of the pneumatic tire T and the hump portion 4 of the wheel W are formed with an uneven shape in which a plurality of recesses are arranged along the tire circumferential direction as shown in FIG. . The bead portion of the pneumatic tire T shown in FIG. 2 forms a concavo-convex shape 7 a by arranging a plurality of concave portions 6 a along the tire circumferential direction on the heel portion H. Further, the wheel W shown in FIG. 3 has a hump portion 4 formed on the inner end side in the axial direction of the rim seat surface 3a, and a plurality of concave portions 6b are arranged in the hump portion 4 in the tire circumferential direction, thereby forming an uneven shape 7b. is doing.
[0018]
When the tire T is assembled to the wheel W, one of the bead portions 2 and 2 is previously attached to one rim seat surface 3a, and the other bead portion 2 is dropped into the well portion 5 of the wheel W. The bead portion 2 dropped into the well portion 5 is moved over the hump portion 4 while applying internal pressure, and is seated on the rim seat surface 3a. In the present invention, because it forms a respective hump portion 4 recess 6a及beauty recess 6b of the heel portion H and the wheel W of the bead portion 2, when the bead portion 2 gets over the hump portion 4, the bead portion 2 expanding the inner diameter of the bead portion 2 formed recess 6 a is extended temporarily circumferential Then simultaneously write Nde bead portion contains the portion of the bead portion 2 in the recess 6b formed on the hump portion 4 of the wheel W 2 can easily get over the hump portion 4.
[0020]
Recess 6a of the heel portion H及beauty Ha amplifier section 4, formation of 6b, since the bead portion 2 a temporary deformation of the bead portion 2 once overcame hump portion 4 returns to its original shape, the bead portion 2 This does not reduce the tightening force. Therefore, the air sealability and the rim displacement resistance are not hindered.
[0021]
In air-filled tire T as described above, unevenness 7a formed in the heel portion H of the bead portion 2, a pitch between recesses 6a as shown in FIG. 4 and p, between the top surface of the bottom and the convex portion of the concave portion It has a wave shape with an amplitude of λ. In the pneumatic tire T incorporated in the wheel W of the present invention, the pitch p is set to be 0.5 to 10%, preferably 1 to 5% of the circumferential length of the bead seat surface 3b, and the amplitude λ is 0. .5 to 5 mm, preferably 0.5 to 2 mm.
[0022]
By setting in this way, as described above, it is possible to ensure air sealability and rim displacement resistance while maintaining good rim assembly. When the pitch p is less than 0.5% or more than 10% of the circumference of the bead sheet surface 3, the effect of improving the rim assembly workability is reduced. In addition, when the amplitude λ is less than 0.5 mm, the unevenness becomes too small and it is difficult to obtain the effect of the present invention, and when it exceeds 5 mm, the air sealing property and the rim displacement resistance are liable to be adversely affected.
[0023]
Further, the bead portion 2 of the air-filled tire T, as shown in FIG. 5, in the tire axial direction of the recess 6a on the bead seat surface 3b the length y, of the surface and the bead core 9 in contact with the inner surface of the rim flange 8 The length x to the center is set to 5 to 60%, preferably 20 to 40%.
[0024]
By setting in this way, it is possible to ensure air sealability and rim displacement resistance while maintaining good rim assembly. If it is less than 5%, it is difficult to improve the rim assembly workability. If it exceeds 60%, the contact area with the rim seat surface 3a is reduced, and the air sealability and rim displacement resistance are likely to be adversely affected.
[0025]
On the other hand, the hump portion 4 projecting rim sheet surface 3a of the tire wheel W of the present invention, irregularities 7b that a plurality of recesses 6b are arranged along the circumferential direction as shown in FIG. 3 is formed, irregularities 7b is As shown in FIG. 4, the pitch p between the concave portions 6b and the amplitude λ between the bottom surface of the concave portion and the top surface of the convex portion are wavy. In the present invention, the pitch p is set to be 0.5 to 10% of the circumference of the rim seat surface 3a, preferably 1 to 5%, and the amplitude λ is 20 to 90% of the height h of the hump portion 4. However, it is preferably set to be 50 to 80%.
[0026]
By setting in this way, as described above, it is possible to ensure air sealability and rim displacement resistance while maintaining good rim assembly. When the pitch p is less than 0.5% or more than 10% of the circumference of the bead sheet surface 3, the effect of improving the rim assembly workability is reduced. Further, when the amplitude λ is less than 20% of the height h of the hump portion 4, the effect of improving the rim assembly workability is reduced.
[0027]
In the wheel W of the present invention, it is more preferable to form at least one, most preferably three or more slits 10 in the tire axial direction on the convex portion of the hump portion 4 as shown in FIG. Thereby, the friction force when the bead part 2 gets over the hump part 4 is reduced, and the rim assemblability is further improved.
[0028]
The slit 10 is preferably set so that the slit width a shown in FIG. 7 is 0.1 to 10 mm, and most preferably 0.5 to 5 mm. The depth b of the slit 10 is preferably 1 to 20% of the height h of the hump 4. When the width a of the slit 10 is less than 0.1 mm or more than 10 mm, it is difficult to obtain a sufficient frictional force reducing effect as a slit.
[0030]
【The invention's effect】
As described above, in the tire wheel and the pneumatic tire-wheel assembly of the present invention, a concavo-convex shape having a predetermined pitch and amplitude is formed in the hump portion of the wheel, and a bead portion corresponding to the concavo-convex shape is formed. Since a pneumatic tire having a predetermined concavo-convex shape is incorporated in the heel portion of the tire , when the pneumatic tire is assembled with a rim, the concave portion formed in the heel portion is pulled in the circumferential direction, thereby making the appearance of the bead portion The inner perimeter of the rim becomes larger, the bead part can easily get over the hump part, and the rim assembly workability is improved, and the air sealability and rim deviation resistance can be hindered without reducing the tightening force of the bead part. Absent.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an assembly of a pneumatic tire and a wheel according to the present invention.
FIG. 2 is a partial perspective view showing an example of a bead portion of a pneumatic tire incorporated in a tire wheel of the present invention.
FIG. 3 is a partial perspective view showing an example of a bead seat surface of the tire wheel of the present invention.
FIG. 4 is an explanatory view showing uneven shapes formed in a heel portion of a bead portion and a hump portion of a wheel.
FIG. 5 is a partial cross-sectional view showing a bead portion of a pneumatic tire incorporated in a tire wheel of the present invention.
FIG. 6 is a partial perspective view showing another example of the bead seat surface of the tire wheel of the present invention.
FIG. 7 is an enlarged side view of the hump portion of the tire wheel of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Assembly of a pneumatic tire and a wheel 2 Bead part 3a Rim seat surface 3b Bead seat surface 4 Hump part 5 Well part 6a, 6b Recessed part 7a, 7b Uneven shape 8 Rim flange 9 Bead core 10 Slit

Claims (4)

In a tire wheel having a rim seat surface into which a bead portion of a pneumatic tire is incorporated, and forming a protruding hump portion extending in the circumferential direction on the rim seat surface,
A concave / convex shape in which a plurality of concave portions are arranged along the circumferential direction is formed on the hump portion, and a pitch between the concave portions of the concave / convex shape is set to 0.5 to 10% of a circumferential length of the rim sheet surface. A tire wheel in which an amplitude between a bottom surface and a top surface of a convex portion is 20 to 90% of a height of the hump portion. The tire wheel according to claim 1 , wherein at least one or more slits extending in a tire axial direction are formed in a convex portion of the hump portion. The tire wheel according to claim 2 , wherein a width of the slit is 0.1 to 10 mm and a depth thereof is 1 to 20% of a height of the hump portion. A concavo-convex shape in which a plurality of concave portions are arranged along the tire circumferential direction is formed on the heel portion of the bead portion, and the pitch between the concave portions of the concavo-convex shape is set to the circumference of the bead sheet surface. The amplitude between the bottom surface of the concave portion and the top surface of the convex portion is set to 0.5 to 5 mm, and the length of the uneven shape on the bead seat surface in the tire axial direction is set to a rim. The pneumatic tire and wheel assembly which incorporated the pneumatic tire made into 5 to 60% of the length from the flange inner surface to the bead core center in the wheel for tires of any one of Claims 1-3 .

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