JPH11254912A - Pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire correctable in unbalance when the tire is assembled into a rim. SOLUTION: In a pneumatic tire 10, a balance adjusting part 16 is provided in a peripheral direction on a portion not being the grounding surface of a shoulder part 14, and plural adjusting hole parts 18 are formed in the peripheral direction at constant intervals in the adjusting part 16. The tire 10 thus formed is assembled into a rim to measure unbalance by a balancer, etc., and an adjusting member is fitted into the hole parts 18 at a given position in the peripheral direction based on a measured result, thereby adjusting added weight by the number of the adjusting members to be fitted. The unbalance of the rim-assembled tire 10 can be adjusted by thus adding given weight to the adjusting part 16. In this case, the unbalance can be corrected by a balance weight formed of material having gravity lower than that of lead, thereby it is preferable as the measures for environment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire provided with a balance adjusting portion for adding a balance weight for adjusting imbalance of a rim-mounted tire to a shoulder portion of the tire.

[0002]

2. Description of the Related Art Hitherto, it has been practiced to measure the imbalance of a rim-mounted tire and correct the imbalance based on the measurement result. In other words, the balancer measures the amount of unbalance and the circumferential position (angle) of the unbalance (light point), and attaches a balance weight to the rim flange of the wheel corresponding to this circumferential position to correct the unbalance. Do.

[0003]

SUMMARY OF THE INVENTION In recent years, one of the environmental problems raised worldwide has been to reduce the amount of lead used. Since the balance weight used for correcting the imbalance of the rim-assembled tire is conventionally made of lead, reducing the amount of the balance weight used has been a major issue for tire manufacturers.

In order to reduce the amount of balance weight (lead) used, it is conceivable to reduce the amount of unbalance generated in tires and wheels, that is, to improve the manufacturing accuracy of tires and wheels. There are problems such as technological development, and it is difficult to respond immediately.

Therefore, when assembling the tire to the rim,
The wheel and tire are mounted so as to offset the imbalance, and the amount of unbalance in the rim-mounted tire is reduced. By devising such an assembling method, the unbalance amount of the rim-assembled tire is reduced, and the amount of the balance weight (lead) used for the unbalance correction is reduced.

[0006] However, there is a need to further reduce the amount of balance weight (lead) used.

Therefore, the inventor of the present invention has devised to further reduce or eliminate the use of the balance weight formed of lead by correcting imbalance in the tire of the rim-assembled tire. .

That is, it is an object of the present invention to provide a pneumatic tire capable of correcting imbalance when mounted on a rim.

[0009]

According to the first aspect of the present invention, a circulating balance adjusting portion for adding a balance weight is provided on the non-ground surface of the shoulder portion of the tire,
A balance weight is added to a part of the balance adjusting section to adjust imbalance when assembled to the rim.

The operation of the first aspect of the present invention will be described. When adjusting the imbalance of the rim assembled tire,
The imbalance can be corrected by adding a balance weight to a predetermined portion (circumferentially unbalanced (light point) position) of the orbiting balance adjustment unit. At this time, since the balance adjusting portion is provided on the shoulder portion of the tire, the distance from the center axis of the tire is larger than that of the rim flange portion, and the imbalance can be corrected with a smaller increase or decrease in weight. Therefore, the imbalance can be corrected by the balance weight formed from a material having a smaller specific gravity than lead. As a result, the imbalance can be corrected without mounting the lead balance weight, which is preferable for environmental measures.

According to a second aspect of the present invention, in the first aspect of the present invention, the balance adjusting portion is formed with a concave portion for adding a balance weight.

The operation of the second aspect of the present invention will be described. When the unbalance is corrected, since the concave portion for adding the balance weight is provided in the circumferential direction of the shoulder portion of the tire, the balance weight is added to the concave portion located at a desired portion (adhesion, fitting, filling) The imbalance can be easily corrected by mounting a heavy object by the above method. Further, since the balance weight is attached to the concave portion, the balance weight does not shift during traveling.

According to a third aspect of the present invention, in the second aspect of the present invention, a plurality of recesses are formed in the balance adjusting portion at regular intervals in a circumferential direction.

The operation of the third aspect of the present invention will be described. Since the plurality of recesses are formed at regular intervals in the circumferential direction, it can be used as a measure of the added weight depending on the number of recesses in which the balance weight is mounted.

[0015]

[First Embodiment] FIGS. 1 and 2 show a pneumatic tire according to a first embodiment of the present invention.
This will be described with reference to FIG.

The pneumatic tire 10 has a balance adjusting portion 16 which circulates on the surface of the shoulder portion 14 on both sides continuous with the tread 12.

The balance adjusting section 16 has adjusting holes 18 provided in the circumferential direction at predetermined intervals. The adjusting hole 18 has a small-diameter introducing portion 20 exposed on the surface of the shoulder portion 14 and a large-diameter fitting portion 22 formed continuously therethrough.
It is composed of

The balance adjusting portion 16 is formed at a portion of the shoulder portion 14 of the pneumatic tire 10 which does not become a part of the ground contact surface. Therefore, tread 12
The balance adjuster 16 becomes a part of the ground contact surface due to the wear of the vehicle, and does not affect the running performance of the vehicle.

The pneumatic tire 10 thus formed
The operation of will be described. The imbalance of the rim-assembled pneumatic tire 10 is measured by a balancer. Thereby, the unbalance amount and the circumferential position (angle) of the unbalance (light point) are determined.

Therefore, an adjustment member 24 having a weight corresponding to the unbalance amount is inserted into the adjustment hole 18 at a predetermined circumferential position in the balance adjustment section 16. The adjusting member 24 is formed substantially in the same shape as the adjusting hole 18. Therefore, the adjustment member 24 is inserted from the introduction portion 20 of the adjustment hole 18 and fitted into the fitting portion 22. The unbalance is corrected by fitting a predetermined number of the adjusting members 24 into the adjusting holes 18.

As described above, since the balance adjusting portion 16 is provided on the shoulder portion 14 of the pneumatic tire 10, the distance from the center axis of the tire is large, and the rim flange of the wheel is used when correcting the imbalance amount. It is possible to cope with the balance weight of a smaller weight than the balance weight of the lead attached to the lead. That is, a balance weight made of a material having a smaller specific gravity than lead can be used. Therefore, it is not necessary to use a balance weight formed of lead, which is preferable in environmental measures.

Even when the amount of unbalance is large and a balance weight made of lead must be attached to the rim flange of the wheel, a part of the unbalance can be corrected by the balance adjusting unit 16. Therefore, the amount of use of the balance weight formed of lead can be reduced.

The adjustment hole 18 of the balance adjustment unit 16
May be filled with a filler such as a caulking agent. In this case, by filling the filler from the introduction part 20 with a tool (not shown), the weight of the balance adjustment part 16 at a predetermined circumferential position is locally increased to correct the imbalance.

Further, for the above-described reason, it is preferable that the balance adjusting section 16 be located at a position apart from the center axis of the pneumatic tire 10 if the tread 12 does not touch the ground even if worn. Second Embodiment Next, a pneumatic tire 30 according to a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The balance adjusting section 16 of the pneumatic tire 30
Also, a plurality of adjustment holes 18 are formed at regular intervals in the shoulders 14 on both sides. Adjustment hole 18
Is formed of a square introduction part 32 exposed on the surface of the shoulder part 14 and a square fitting part 34 larger than the introduction part 32 formed continuously in the back.

The operation of the pneumatic tire 30 will be described. When the unbalance position of the rim-assembled pneumatic tire 30 is measured, the adjustment member 36 having a weight corresponding to the unbalance amount is inserted into the adjustment hole 18 at a predetermined circumferential position in the balance adjustment unit 16. As shown in FIG. 4, the adjusting member 36 includes a square surface portion 36a, an intruding portion 36b inserted into the adjusting hole portion 18, and a connecting portion 36c connecting the both. Therefore,
The entry portion 36b fits into the fitting portion 34 of the adjustment hole 18, and the surface portion 36a is exposed on the surface of the shoulder portion 14 (FIG. 3).
reference).

As described above, the entry portion 36b of the adjustment member 36
Is inserted from the introduction portion 32 of the adjustment hole portion 18 and fitted into the fitting portion 34. A predetermined number of the adjusting members 36 are
To increase the weight by a predetermined amount, locally,
Correct the imbalance.

Although the adjusting member 36 is fitted in the adjusting hole 18 in the present embodiment, the adjusting member 36 may be attached to the adjusting member 18 or the adjusting portion 36 may be inserted.
b of the adjusting member having the shape of only the fitting hole 3
4, or the filler may be filled in the adjustment hole 18. [Third Embodiment] Next, a pneumatic tire 40 according to a third embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The balance adjusting section 16 of the pneumatic tire 40
A plurality of convex portions 42 and concave portions 44 extending in the radial direction on the shoulder portions 14 on both side surfaces are formed alternately and continuously in the circumferential direction.

The operation of the pneumatic tire 40 will be described. When the unbalance position of the rim-assembled pneumatic tire 40 is measured, the adjuster 46 having a weight corresponding to the unbalance amount is adhered to the balance adjuster 16 at a predetermined circumferential position in the balance adjuster 16. The adjusting agent 46 is, for example, a gel rubber. At this time, since the convex portions 42 and the concave portions 44 are formed alternately and continuously in the balance adjusting portion 16, the bonding area of the adjusting agent 46 is increased, and the adjusting agent 46 is securely positioned at a predetermined position in the circumferential direction. Glued, locally increasing weight. Thereby, the imbalance of the rim-assembled pneumatic tire 40 is corrected. In addition, since the adjusting agent 46 is adhered on the convex portion 42 and the concave portion 44, the adjusting agent 46 does not shift due to the rotation of the tire.

The adjusting agent 46 is provided in the balance adjusting section 16.
It may be of a type that is not only adhered to but also applied.

Test Examples In order to prove the effect of the present invention, the following tests were conducted. The example tire is the pneumatic tire 10 according to the first embodiment of the present invention, and the comparative example tire is a pneumatic tire 10 in which the balance adjusting unit 16 is used.
(Adjustment hole 18) is not provided. Example tires and comparative example tires have a size of 195 / 65R14, a rim of 6JJ-14, and a tire internal pressure of 2.0 kg / cm ^2.
It is.

As shown in FIG. 7, the unbalance correction of the comparative example tire is performed by the balance weight 54 attached to the rim flange portion 52 of the wheel 50. The example tire has an adjustment member 24 in an adjustment hole 18 of the balance adjustment unit 16.
To correct the imbalance.

The radius r1 from the tire center axis to the center of the balance weight, the radius r2 from the center of the balance adjustment unit 16 of the rim-assembled pneumatic tire 10, the center of the balance weight 54 from the tire center plane (equatorial plane) C Assuming that the distance L1 to the distance L1 and the distance L2 to the center of the balance adjustment unit 16 are r1 = 183.8 mm and r2 = 28, respectively.
0.0mm, L1 = 81.2mm, L2 = 92.0mm
It is.

The unbalance of the tire of the example and the tire of the comparative example is measured by a balancer. Based on this result, the balance weight 54 is attached to the rim flange 52 in the comparative example tire. In the example tire, the adjustment member 24 is fitted into the adjustment hole 18 of the balance adjustment section 16. FIGS. 8A and 8B show the mounted weight and the circumferential position (angle) thereof.

Example 1 and Comparative Example 1, Example 2 and Comparative Example 2
Indicate that the unbalance amounts are almost the same.

The total weight of the balance weights 54 mounted on the front and back sides of the wheel, and the shoulders 14 on both sides
Comparing the total weight fitted to the adjustment hole portions 18 provided in the tires, the example tires (Examples 1 and 2) having a larger radius r2 from the tire center axis require less weight to be mounted. You can see that.

[0038]

According to the first aspect of the present invention, there is provided the above-mentioned structure, and therefore, when correcting the imbalance of the rim-mounted tire,
Since a balance weight having a specific gravity smaller than that of lead can be used, a balance weight formed of lead can be omitted or reduced, which is preferable in environmental measures.

According to the second aspect of the present invention, since the above-described configuration is adopted in the first aspect of the present invention, the mounting of the balance weight is facilitated, and the unbalance correction is simplified.

According to the third aspect of the present invention, since the above-described configuration is adopted in the second aspect of the present invention, by attaching the balance weight to the concave portion, the added weight is a measure of the added weight, and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pneumatic tire according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the pneumatic tire according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a pneumatic tire according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a pneumatic tire according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a pneumatic tire according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a pneumatic tire according to a third embodiment of the present invention.

FIG. 7 is an explanatory sectional view of test conditions of the present invention.

FIGS. 8A and 8B are diagrams showing test results of the present invention.

[Explanation of symbols]

 Reference Signs List 10 Pneumatic tire 14 Shoulder part 16 Balance adjustment part 18 Adjustment hole (recess) 24, 36 Adjustment member (balance weight) 44 Recess 46 Adjuster (balance weight)

Claims (3)

[Claims] An orbiting balance adjusting portion for adding a balance weight is provided on a non-ground surface of a shoulder portion of a tire, and the tire is assembled to a rim by adding a balance weight to a part of the balance adjusting portion. A pneumatic tire characterized by adjusting the imbalance at the time. 2. The pneumatic tire according to claim 1, wherein a recess for adding a balance weight is formed in the balance adjusting section. 3. The pneumatic tire according to claim 2, wherein a plurality of recesses are formed in the balance adjusting section at regular intervals in a circumferential direction.