JPH11254929A - Tire-rim assembly, and tire assembling method into rim - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce as much as possible the balance weight of a tire-rim assembly. SOLUTION: The dynamic unbalance (F2) of a tire's own can be canceled by dynamic unbalance (F1) generated by the tilt of a tread, consequently a tire-rim assembly having a few dynamic unbalance can be obtained, thereby lessening a balance weight; because a position, in the tire peripheral direction in the heaviest part in the dynamic unbalance of a tire 10 mounted on the rim of a tire testing machine and measured, and a position, for indicating the maximum value of the mean tilt angle of a tread 40 to a tire rotation axis C in a tire peripheral direction, are positioned in the same direction looking from the tire rotation axis C; and also the position of the heaviest part of the dynamic unbalance (F2), and the larger radius side, in the right and left shoulder part in the position for indicating the maximum value of the mean tilt angle of the tread 40 in the tire peripheral direction, are faced with a tire equator surface CL nipped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a tire on a rim and a tire / rim assembly, and more particularly to a tire / rim assembly capable of obtaining a tire / rim assembly with a corrected imbalance in weight. Method and
The present invention relates to a tire / rim assembly having a weight imbalance corrected.

[0002]

2. Description of the Related Art It is well known that vibration occurs when a rim-mounted tire is rotated in a weightly unbalanced state.

There are two types of imbalance: static imbalance, which is where there is no rotation within 360 degrees, and dynamic imbalance that occurs only after rotation.

As a method of correcting such imbalance, a method of correcting static imbalance first, then rotating a rim-mounted tire and using a separate balance weight to correct dynamic imbalance is used. There is.

However, at present, the rim-mounted tire is mainly rotated by a balancer, and the resultant force of the static balance and the dynamic balance required for the correction is measured, and based on the measured result, one at each of the front and back surfaces of the rim flange. Attempts have been made to simultaneously correct static balance and dynamic balance by using a method of attaching balance weights.

[0006]

Conventionally, the unbalance amount in the weight unbalance correction method is a correction of the unbalance amount obtained by combining the unbalance when the rim is assembled with the unbalance of the tire. In addition, due to their voluntary nature, the result of the completed tire / rim assembly was left to the end.

In the present situation where lead is used as the balance weight, considering the effect on the environment, it is not always a satisfactory balance correction in terms of the amount of lead used.

At the present time, it is difficult to substitute the balance weight of lead from the viewpoint of specific gravity.

As long as the conventional balance method is adopted,
Environmentally, the balance weight of lead cannot be reduced.

In view of the above facts, the present invention provides a method for assembling a tire to a rim capable of obtaining a tire / rim assembly with a balance weight as small as possible, and a tire / rim assembly with a balance weight as small as possible. The purpose is to provide.

[0011]

In order to assemble a tire to a rim using a rim assembling machine, for example, when using a rim assembling machine generally called a Hoffman type (manufactured by Hoffman), first, one bead is used. After dropping the part between both flanges of the rim, a part of the other bead part was dropped inside the flange in the tire axial direction and temporarily fixed with a jig, and arranged at a different circumferential position from the jig. The bead dropping means (guide) is inserted between the bead portion located outside the flange in the axial direction and the flange to rotate the rim and the tire, and the relative position between the rim and the tire and the bead dropping means is increased. The bead part located on the outside of the flange in the axial direction is gradually dropped by the movement into the inside of the flange in the axial direction, and finally the bead dropping means and jig are removed to fill the air. Do.

In this method, a part of the bead portion is largely dropped from the flange to the inside in the tire axial direction (toward the wheel drop center).

Among the bead portions, the portion that is greatly dropped by using a jig is deformed so that the bead portion is depressed inward in the tire axial direction. Therefore, as shown in FIG.
4, a large space 36 surrounded by the bead seat portion 30 and the flange 16 and the bead base 32 and the flange contact portion 34 remains largely, and the bead base 32 stops inside the regular position of the bead seat portion 30 in the tire axial direction. As a result, even if the internal pressure is filled, it is difficult to protrude largely outward in the tire axial direction and to be arranged at a regular position. For this reason, the radius of the shoulder portion on the side where the space 36 is formed is the smallest, and the radius of the shoulder portion on the opposite side is relatively large.

Also, a rim assembly machine other than the Hoffman type,
For example, in a rim assembling machine called Coats type (manufactured by Coates), after dropping one bead between both flanges of the rim, part of the other bead is dropped inside the flange in the tire axial direction, and the dropping part Insert the lever that drops the bead into the gap between the flange and the bead in the vicinity of, and rotate this lever to gradually drop the bead located outside the flange in the axial direction inside the flange, and finally Then, release the lever and fill with air.

According to this method, the bead portion located on the axially outer side of the flange is gradually dropped into the axially inner side of the flange. However, when the bead portion located on the axially outer side of the flange becomes small, the remaining bead portion becomes smaller. The portion is further dropped axially inward of the flange by pulling on the bead portion that the lever has already dropped.

In the tire assembled by this method, there is a portion in the bead portion where this portion stops inside the normal position in the tire axial direction from the regular position similarly to the tire mounted on the above-described Huffman type rim assembling machine. This occurs, and the tire radius is slightly reduced locally at a position corresponding to this portion in the bead portion. That is, even in this method, the space 3
The radius of the shoulder portion on the side where 6 is formed becomes the smallest, and the radius of the shoulder portion on the opposite side becomes relatively large.

As described above, when the tread is inclined with respect to the tire rotation axis, when the tire rotates, the shoulder portion having the larger radius of the inclined tread is larger than the shoulder portion having the smaller radius. A centrifugal force acts, and a dynamic imbalance occurs.

The inventor of the present invention has found that a tire / rim assembly having good uniformity can be obtained by counteracting and reducing the dynamic imbalance of the tire itself by the dynamic imbalance caused by the inclination of the tread surface. I found it.

The invention described in claim 1 has been made in view of the above facts, and is a tire / rim assembly in which a tire and a rim are combined, and is mounted on a rim of a tire tester and measured. The position of the heaviest part of the dynamic imbalance of the tire in the tire circumferential direction and the position where the average inclination angle of the tread tread with respect to the tire rotation axis shows the maximum value in the tire circumferential direction are the same as viewed from the tire rotation axis. Position, the position of the heaviest part of the dynamic imbalance, and the larger radius side of the left and right shoulders at the position where the average inclination angle of the tread tread shows the maximum value in the tire circumferential direction. Are opposed to each other with the tire equatorial plane interposed therebetween.

The operation of the tire / rim assembly according to the first aspect will be described. If the tread is inclined with respect to the tire rotation axis, when the tire rotates, a larger centrifugal force acts on the shoulder portion with the larger radius of the inclined tread than the shoulder portion with the smaller radius, Dynamic imbalance occurs.

In the present invention, the position in the tire circumferential direction of the heaviest part of the dynamic imbalance of the tire measured and mounted on the rim of the tire testing machine and the average inclination angle of the tread tread surface with respect to the tire rotation axis are determined in the tire circumferential direction. The position where the maximum value is shown is located in the same direction as viewed from the tire rotation axis, and the position of the heaviest part of the dynamic imbalance and the average inclination angle of the tread tread are the maximum values in the tire circumferential direction. Because the large radius side of the left and right shoulders at the position indicating is opposed across the tire equatorial plane, the dynamic imbalance of the tire itself is the dynamic imbalance caused by the inclination of the tread tread surface. The result is a tire and rim assembly that has a small dynamic imbalance.

Further, since the dynamic unbalance can be reduced without using the balance weight, the amount of weight required to make the dynamic van balance zero can be reduced as compared with the related art.

According to a second aspect of the present invention, there is provided a tire / rim assembly in which a tire having a bead portion formed with an annular rim line centered on a tire rotation axis and a rim are combined. The position of the heaviest part of the tire's dynamic unbalance measured on the rim in the circumferential direction of the tire, and the distance from the rim flange measured along the tire radial direction to the rim line, where the distance from the rim line is the smallest. The radial maximum concave portion is located in the same direction as viewed from the tire rotation axis, and the position of the dynamic imbalance's heaviest portion and the radial maximum concave portion are the same as viewed from the tire equatorial plane. It is characterized by being in the axial direction.

The operation of the tire / rim assembly according to the second aspect will be described. If a part of the annular rim line is recessed inward in the tire radial direction, it can be said that the bead base near the recess is located further inward in the tire axial direction than the regular position of the rim (bead seat portion).

As described above, when the bead base of the bead portion is located on the inner side in the tire axial direction from the regular position of the rim, the tire side portion connected thereto is dragged inward in the tire radial direction. Will be inclined toward the concave side.

If the tread is inclined with respect to the axis of rotation of the tire, when the tire rotates, a larger centrifugal force is applied to the shoulder portion having the larger radius of the inclined tread than to the shoulder portion having the smaller radius. Act, and a dynamic imbalance occurs.

In the present invention, the position of the heaviest part of the dynamic imbalance of the tire measured on the rim of the tire tester in the circumferential direction of the tire and the distance from the rim flange measured along the tire radial direction to the rim line are measured. Of the rim line where the distance of the rim line is the smallest is located in the same direction as viewed from the tire rotation axis, and the position of the heaviest part of the dynamic imbalance and the radially largest dent are Since the tires are in the same axial direction as viewed from the equatorial plane, the dynamic imbalance of the tire itself is canceled by the dynamic imbalance caused by the inclination of the tread tread, and as a result, the tire / rim assembly having a small dynamic imbalance Becomes

Further, since the dynamic unbalance can be reduced without using the balance weight, the amount of weight required to make the dynamic van balance zero can be reduced as compared with the conventional case.

According to a third aspect of the present invention, in the method for assembling a tire on a rim, the position of the heaviest part of the dynamic unbalance of the tire measured on the rim of the tire tester in the circumferential direction of the tire is measured from the tire rotation axis. It is characterized in that the tire is assembled to the rim so as to be in the same direction as the final mounting portion of the bead portion to be finally mounted in the bead portion and to be in the same axial direction of the tire.

The operation of the method for assembling a tire to a rim according to the third aspect will be described. There are various types of rim assembling machines for mounting tires on the rim. For example, when the rim assembling is performed using a rim assembling machine (manufactured by Coates) called a coats type, the deepest portion in the bead portion is obtained. The bead base of the bead part which is finally dropped into the rim (bead seat part) stops inside the tire axial direction from the regular position of the rim (bead seat part), preventing it from being placed at the regular position even if internal pressure filling is performed Can be

Here, when the final mounting portion of the bead portion stops at a position shifted inward in the tire axial direction from the normal position of the rim, the tire radius at the final mounting portion becomes smaller than other positions.

As described above, when the bead base of the bead portion is located on the inner side in the tire axial direction from the regular position of the rim, the tire side portion connected thereto is dragged inward in the tire radial direction, and as a result, the tread is reduced. Will be inclined toward the concave side.

If the tread is inclined with respect to the axis of rotation of the tire, when the tire rotates, a larger centrifugal force is applied to the shoulder portion having the larger radius of the inclined tread surface than to the shoulder portion having the smaller radius. Act, and a dynamic imbalance occurs.

In the method for assembling a tire on a rim according to the third aspect, the position of the heaviest part of the dynamic unbalance of the tire measured and mounted on the rim of the tire testing machine in the tire circumferential direction is determined from the tire rotation axis. When the tire is assembled to the rim so that it is in the same direction as the final mounting part of the bead part to be finally mounted in the bead part and is on the same axial side of the tire, the tire itself has As a result, a tire / rim assembly having a small dynamic imbalance is obtained, in which the dynamic imbalance is canceled by the dynamic imbalance caused by the inclination of the tread surface.

Further, since the dynamic unbalance can be reduced without using the balance weight, the amount of weight required to make the dynamic van balance zero can be reduced as compared with the conventional case.

According to a fourth aspect of the present invention, in the method for assembling a tire to a rim according to the third aspect, a marking is provided on a side surface of the tire to indicate a position of the heaviest part of the dynamic unbalance in the tire circumferential direction, The tire is mounted on the rim such that the marked tire circumferential position is the tire circumferential position of the bead portion final mounting portion.

The operation of the method for assembling a tire to a rim according to claim 4 will be described. In the method of assembling the tire to the rim according to claim 4, marking is performed on a side surface of the tire to indicate a position in a tire circumferential direction of a heaviest part of dynamic imbalance,
Since the tire is assembled to the rim such that the marked tire circumferential position is the tire circumferential position of the bead portion final mounting portion, the positioning of the tire and the rim is facilitated.

According to a fifth aspect of the present invention, one bead portion is dropped between both flanges of the rim, and then the other bead portion is dropped inside the flange in the tire axial direction. A method of assembling a tire to a rim that gradually drops inward in the direction, wherein a position in a tire circumferential direction of a maximum dynamic unbalance portion of the tire measured by being mounted on a rim of a tire tester is viewed from the tire rotation axis. The tire is mounted on the rim so as to be in the same direction as the deepest dropping portion of the other bead portion and in the same axial direction of the tire.

The operation of the method for assembling a tire to a rim according to claim 5 will be described. There are various rim assembling methods for mounting the tire on the rim, but a part of the bead part is greatly dropped inside the flange in the tire axial direction,
Thereafter, when the remaining portion is gradually dropped, if the portion to be greatly dropped first is strongly pressed, the portion is deformed so as to be depressed inward in the tire axial direction. For this reason, even if the internal pressure is filled after dropping the bead portion, the recessed portion of the bead portion largely protrudes outward in the tire axial direction and is prevented from being arranged at a regular position.

Here, if the portion of the bead portion that is dropped first stops at a position shifted inward in the tire axial direction from the regular position of the rim, the tire radius of the portion that is dropped first becomes different. It becomes smaller than the position.

As described above, when the bead base of the bead portion is located on the inner side in the tire axial direction from the normal position of the rim, the tire side portion connected thereto is dragged inward in the tire radial direction. Will be inclined toward the concave side.

If the tread is inclined with respect to the axis of rotation of the tire, when the tire rotates, a larger centrifugal force is applied to the shoulder portion having the larger radius of the inclined tread surface than to the shoulder portion having the smaller radius. Act, and a dynamic imbalance occurs.

In the method for assembling a tire to a rim according to the fifth aspect, the position of the maximum dynamic unbalance portion of the tire measured on the rim of the tire testing machine in the tire circumferential direction is viewed from the tire rotation axis. When the tire is assembled to the rim so that it is in the same direction as the part of the other bead part and in the same axial direction of the tire, the dynamic imbalance of the tire itself is caused by the inclination of the tread tread surface. As a result, a tire / rim assembly with a small dynamic imbalance canceled by the above is obtained.

Since the dynamic unbalance can be reduced without using the balance weight, the amount of weight required to make the dynamic van balance zero can be reduced as compared with the conventional case.

According to a sixth aspect of the present invention, in the method of assembling a tire to a rim according to the fifth aspect, a marking is provided on a side surface of the tire to indicate a circumferential position of the maximum dynamic unbalance portion in the tire circumferential direction. The tire is mounted on the rim in such a manner that the tire circumferential direction position provided with the tire is in the same direction as the deepest drop portion of the other bead portion.

The operation of the method for assembling a tire to a rim according to claim 6 will be described. In the method for assembling the tire to the rim according to claim 6, a marking is provided on a side surface of the tire to indicate a position in the tire circumferential direction of the maximum dynamic imbalance portion,
Since the tire is assembled to the rim such that the marked tire circumferential position is in the same direction as a part of the other bead portion, the alignment between the tire and the rim is facilitated.

According to a seventh aspect of the present invention, after one bead portion is dropped between both flanges of the rim, a part of the other bead portion is dropped inside the flange in the tire axial direction and temporarily fixed with a jig. The bead dropping means and the rim disposed at positions different from the jig in the circumferential direction of the tire are relatively moved along the circumferential direction of the rim, and the bead dropping means is positioned outside the flange in the axial direction. A method of assembling a tire to a rim that gradually drops a bead portion axially inward of a flange. It is characterized in that the jig is attached to a position 90 degrees ahead.

The operation of the method for assembling a tire to a rim according to claim 7 will be described. There are various types of rim assembling machines for mounting a tire on a rim. For example, when a rim assembling machine called a Hoffman type (manufactured by Hoffman Co.) is used, a rim assembling of a bead portion is performed. The part which is largely dropped inward in the tire axial direction and temporarily fixed by the jig is deformed so as to be depressed inward in the tire axial direction by being pushed by the jig. For this reason, even if the internal pressure is filled after dropping the bead portion, the recessed portion of the bead portion largely protrudes outward in the tire axial direction and is prevented from being arranged at a regular position.

Here, if the final mounting portion of the bead stops at a position shifted inward in the tire axial direction from the normal position of the rim, the tire radius at the final mounting portion becomes smaller than other positions.

As described above, when the bead base of the bead portion is located on the inner side in the tire axial direction from the normal position of the rim, the tire side portion connected thereto is dragged inward in the tire radial direction, and as a result, the tread Will be inclined toward the concave side.

If the tread is inclined with respect to the axis of rotation of the tire, when the tire rotates, a larger centrifugal force is applied to the shoulder portion having the larger radius of the inclined tread surface than to the shoulder portion having the smaller radius. Act, and a dynamic imbalance occurs.

In the method for assembling a tire to a rim according to a seventh aspect, a jig is attached to a position in the tire circumferential direction of a heaviest part of a dynamic unbalance of a tire measured by being mounted on a rim of a tire testing machine. As a result, a tire / rim assembly having a small dynamic imbalance is obtained in which the dynamic imbalance of the tire itself is canceled by the dynamic imbalance caused by the inclination of the tread tread surface.

Since the dynamic unbalance can be reduced without using the balance weight, the amount of weight required to make the dynamic van balance zero can be reduced as compared with the conventional case.

According to an eighth aspect of the present invention, in the method for assembling a tire to a rim according to the seventh aspect, a marking is provided on a side surface of the tire to indicate a position of the heaviest part of the dynamic imbalance in the circumferential direction of the tire, The jig is attached between the position where the marking is made and the position 90 ° ahead.

The operation of the method for assembling a tire to a rim according to claim 8 will be described. In the method for assembling a tire to a rim according to claim 8, marking is performed on the side surface of the tire to indicate a position in the circumferential direction of the heaviest part of the dynamic imbalance,
Since the jig is attached to the position where the marking is applied, the attachment of the jig becomes easy.

According to a ninth aspect of the present invention, in the method of assembling a tire to a rim according to any one of the third to eighth aspects, static imbalance correction is performed after the tire is assembled to the rim. It is characterized by.

The operation of the method for assembling a tire to a rim according to the ninth aspect will be described. According to the tire assembling method of the ninth aspect, in addition to the dynamic balance correction, the static imbalance correction is also performed, so that not only the lateral vibration of the tire but also the vertical vibration can be reduced.

[0058]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of a method for assembling a tire to a rim according to the present invention will be described with reference to the drawings.

The present embodiment relates to a rim assembling method when a rim is assembled using a so-called Hoffman type rim assembling machine (manufactured by Hoffman).

As shown in FIG. 1, a tire 1 to be assembled with a rim
Before the rim assembling, a mark 12 is provided on the side surface of the tire 0 at a position in the tire circumferential direction indicating the heaviest part of the dynamic balance obtained by a known tire balancer in advance.

An annular rim line 11 is formed in the bead portions 15 and 20 of the tire 10.

As shown in FIGS. 1 and 2, the tire 10
Is mounted on the rim 14 set on the rim assembling machine 13 with the mark 12 facing upward, and one bead portion 15 of the tire 10 is connected to the upper flange 16 of the rim 14 set on the rim assembling machine 13. After being dropped between the lower bead 18 and a part of the other bead portion 20,
Jig 2 in the axial direction (the direction of arrow A in the figure).
2 (for example, bead holder manufactured by Hoffman, MON-05 manufactured by Banzai, etc.).

At this time, when viewed from the rotation axis C, the mark 12
The jig 22 to the position. It is preferable that the jig 22 is attached to the rim 14 at a position away from the valve 26.

Next, as shown in FIG. 1, the bead dropping means (guide) 2 of the rim assembling machine 13 is located at a position away from the jig 22 in the clockwise direction (the direction opposite to the direction of arrow B).
8 and the lever 28 of the bead dropping means 28
A is inserted between the bead portion 20 and the flange 16, and the rim 14 and the tire 10 are rotated in the direction opposite to the clockwise direction (the direction of arrow B).

Thus, the flange 16 of the bead portion 20
Is gradually dropped into the flange 16 inward in the axial direction, and finally the entire circumference of the bead portion 20 is dropped into the flange 16 inward in the axial direction.

Thereafter, the bead dropping means 28 and the jig 22 are removed, and the inside of the tire 10 is filled with air through the valve 26.

In this method, a part of the bead portion 20 is largely dropped from the flange 16 inward in the axial direction (so-called wheel drop center side) by the jig 22.

The portion of the bead portion 20 which is largely dropped by the jig 22 (the portion D _{max of} FIG. 2; the deepest drop portion in the present invention) is pushed inward by the jig 22 to be inward in the axial direction. As the jig 22 is deformed so as to be depressed, distortion remains in that portion even after the jig 22 is removed, and FIG.
As shown in FIG. 7, a large space (air pocket) 36 surrounded by the bead seat portion 30 and the flange 16 of the rim 14 and the bead base 32 and the flange contact portion 34 remains largely. It stops axially inward from the position, and even if the internal pressure is filled, it protrudes largely outward in the axial direction and is prevented from being arranged at a regular position.

As described above, when the bead base 32 stops at the position shifted inward in the axial direction from the regular position of the bead seat portion 30, the tire side portion 33 connected thereto is dragged inward in the tire radial direction. As shown in FIG. 4 (B), the space 36 starts from the tire equatorial plane CL of the tire 10.
When looking at the side where the is formed (the side where the jig 22 is mounted), the tire radius r2 passing through the portion where the space 36 is formed is the smallest on one side of the tire 10 (the right half of the drawing). Would.

As a result, the radius r2 of the shoulder on the side where the space 36 is formed is the smallest, and the radius r1 of the shoulder on the opposite side is relatively large, so that the tread surface 40 is inclined.

When the tread surface 40 is inclined with respect to the rotation axis C, when the tire 10 rotates, the shoulder portion on the side where the radius of the inclined tread surface 40 is large and the shoulder portion located at the diagonal thereof are provided. Then, a larger centrifugal force F1 (cause of dynamic imbalance) acts on the shoulder portion having a smaller radius, and a dynamic imbalance occurs as shown in FIG. 4 (B).

As shown in FIG. 4A, when the tire 10 ideally mounted on the rim 17 of the tire testing machine is rotated, a dynamic imbalance occurs due to unevenness of the tire 10 itself.

In this embodiment, as shown in FIG. 4C, the dynamic imbalance (F2) caused by the unevenness of the tire 10 itself is canceled by the dynamic imbalance (F1) caused by the inclination of the tread surface 40. As a result, the tire 10 mounted on the rim 14 (ie, the tire / rim assembly)
Dynamic imbalance is reduced.

The tire 10 mounted on the rim 14 having the reduced dynamic unbalance is mounted on a tire balancer to obtain a final dynamic balance and a static balance. The static imbalance and the remaining dynamic unbalance are obtained. Is corrected with the balance weight in the same manner as before.

In this embodiment, the dynamic imbalance is reduced in advance by the method of mounting the tire 10, and the final dynamic balance is obtained. Therefore, the amount of balance weight necessary for correcting the dynamic balance is made smaller than before. Can be. [Second Embodiment] Next, a second embodiment of the tire assembling method of the present invention will be described with reference to FIG.

The present embodiment is a rim assembling method in the case of performing rim assembling using a so-called coat type rim assembling machine (manufactured by Coates) 42.

The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG.
In the rim assembling method of the present embodiment, one bead portion 15 (not shown in FIG. 5) of the tire 10 is attached to the rim assembling machine 42.
After being dropped between the upper flange 16 and the lower flange 18 (not shown in FIG. 5) of the rim 14 mounted on the rim 14, a part of the other bead portion 20 is moved in the axial direction of the flange 16 (in the drawing). (In the direction of arrow A), drop inward, and move the lever 44 of the rim assembling machine 42 to the flange 1 near the dropped portion.
6 is inserted into the gap between the bead portion 20 and the lever 44 is rotated in the direction opposite to the clockwise direction (the direction of arrow B) so that the bead portion 20 located on the outside of the flange 16 in the axial direction is rotated by the axis of the flange 16. Finally, the lever 44 is released, and the inside of the tire 10 is filled with air from the valve 26.

In this rim assembling method, the bead portion 2 positioned outside the flange 16 in the axial direction by the rotation of the lever 44
0 is gradually dropped inside the flange 16 in the axial direction, but the bead portion 20 located outside the flange 16 in the axial direction is
Becomes small, the remaining portion is further dropped axially inside the flange 16 by pulling the bead portion 20 dropped by the lever 44.

First, as viewed from the tire rotation center C, the lever 4
The angle θ (in this case, the angle is measured in the direction opposite to the rotation direction of the lever 44) between the position where the lever 4 is inserted and the bead portion final mounting portion 20A (approximately the hatched area in FIG. 5) is
In the case of the tire 10 of the present embodiment, the angle is about 90 ° to 180 °.

If the tires 10 are of the same size and of the same type (brand) of the same maker, the angle θ shows a substantially constant value. Therefore, all the tires 10 of the same size and of the same type (brand) of the same maker. , A lever insertion instruction mark 46 for indicating the insertion position of the lever 44 is provided at a position shifted by 90 ° to 180 ° from the mark 12 provided at the position indicating the maximum value of the lateral force variation (LFV). The angle θ may be different for tires of the same size if the manufacturer or brand is different.

Thus, by inserting the lever 44 in accordance with the instruction mark 46 and assembling the rim, the mark 12 and the bead portion final mounting portion 20A can always be aligned in the tire circumferential direction.

According to this rim assembling method, the bead portion final mounting portion 20A finally dropped in the bead portion 20
The bead base 32 has a bead as in the case of FIG.
The seat 36 stops axially inside the normal position of the seat portion 30, and a space 36 (not shown in FIG. 6) is formed as in the first embodiment. It is prevented from being placed and the tread 40 of the tread 38
Will be inclined in the direction of the space 36.

Also in the present embodiment, the dynamic imbalance caused by the unevenness of the tire 10 itself is canceled by the dynamic imbalance caused by the inclination of the tread surface 40. As a result, the tire 10 mounted on the rim 14 (ie, the tire 10)・
The dynamic imbalance of the rim assembly) is reduced.

Also in this embodiment, since the final dynamic balance is obtained after the dynamic imbalance is reduced by the method of mounting the tire 10, the amount of balance weight required for correcting the dynamic balance can be made smaller than before. .

The method of mounting the tire 10 on the rim 14 may of course use a method other than the above embodiment.

Further, on the radially inner side of the portion of the tread surface 40 that is the most inclined with respect to the rotation axis C, FIG.
As shown in FIG. 3, the bead base 32 is
Can be said to be the most shifted inward in the axial direction than the normal position.

As shown in FIG. 6, where the bead base 32 is most deviated inward in the axial direction from the regular position of the bead seat portion 30, the rim line 11 is most depressed inward in the tire radial direction. It is the same position in the tire circumferential direction as the rim line radial maximum recessed portion 11A.

As shown in FIG. 7, the inner end 26A of the rim 14 of the valve 26 can prevent the bead portion 20 from being damaged, and can prevent the lever or the like of the rim assembling device from being caught. It is preferable that the shape be as thin and smooth as possible. The inner end 26A may be flush with the inner peripheral surface of the rim 14 or may be recessed.

Further, together with the present invention, the tire 10
The position of the light spot mark 24 and the position of the valve 26 of the rim 14 may be matched to reduce radial force variation. Further, together with the present invention, the roundness may be improved by combining the longest portion of the tire radius with the shortest radius portion of the bead seat portion of the rim.

[0090]

As described above, the tire of the present invention
The rim assembly has an excellent effect that the dynamic imbalance is reduced and the balance weight for correcting the imbalance can be reduced.

Further, according to the method for assembling a tire to a rim according to the present invention, it is possible to easily obtain a tire / rim assembly in which dynamic imbalance is reduced and a balance weight for correcting imbalance is small. Has excellent effects.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rim and a tire mounted on a tire mounting machine for explaining a method of mounting a tire on a rim according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a cross-sectional view of a bead portion mounted on the rim so as to be deviated from a proper position.

FIG. 4A is an explanatory view showing the maximum lateral force of lateral force variation generated in a tire mounted on a rim of a tire testing machine, and FIG. 4B is a diagram illustrating the lateral force generated in the tire by an inclined tread. It is an explanatory view showing, and (C) is an explanatory view showing that the maximum lateral force of the lateral force variation and the lateral force generated in the tire by the inclined tread are offset.

FIG. 5 is a perspective view of a rim and a tire mounted on a tire mounting machine for explaining a method of mounting a tire on a rim according to a second embodiment of the present invention.

FIG. 6 is a side view of a tire mounted on a rim.

FIG. 7 is a cross-sectional view of the vicinity of the valve of the rim.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Tire 11 Rim line 11A Rim line radial maximum concave part (radial maximum concave part) 14 Rim 15 Bead part 16 Flange 20 Bead part 20A Bead part final mounting part 40 Tread (tread tread)

Claims (9)

[Claims] 1. A tire / rim assembly in which a tire and a rim are combined, wherein a position of a tire in a circumferential direction of a heaviest part of a dynamic unbalance of a tire measured by being mounted on a rim of a tire testing machine. The position at which the average inclination angle of the tread tread surface with respect to the tire rotation axis shows the maximum value in the tire circumferential direction is located in the same direction as viewed from the tire rotation axis, and the position of the heaviest part of the dynamic imbalance A tire having a large radius of the left and right shoulder portions at a position where the average inclination angle of the tread tread indicates the maximum value in the tire circumferential direction, and facing the tire equatorial plane.・ Rim assembly. 2. A tire / rim assembly comprising a tire and a rim in which an annular rim line centering on a tire rotation axis is formed in a bead portion, wherein the tire / rim assembly is mounted on a rim of a tire tester and measured. The position of the heaviest part of the tire's dynamic unbalance in the circumferential direction of the tire, and the maximum dent in the radial direction of the rim line where the distance from the flange of the rim measured along the tire radial direction to the rim line is the smallest, Are located in the same direction as viewed from the tire rotation axis, and the position of the heaviest part of the dynamic imbalance and the radial maximum recessed part are in the same axial direction as viewed from the tire equatorial plane. Tire and rim assembly. 3. The position in the tire circumferential direction of the heaviest part of the dynamic imbalance of the tire measured by being mounted on the rim of the tire testing machine, and finally the rim and the rim in the bead part as viewed from the tire rotation axis. A method for assembling a tire to a rim, wherein the tire is assembled to the rim in the same direction as the final mounting portion of the bead portion to be mounted and in the same axial direction of the tire. 4. A marking indicating the circumferential position of the heaviest part of the dynamic imbalance on the side surface of the tire, and the tire circumferential position on which the marking is performed is the tire circumferential position of the bead part final mounting portion. The method for assembling a tire to a rim according to claim 3, wherein the tire is assembled to the rim such that: 5. A rim in which one bead portion is dropped between both flanges of the rim, and then the other bead portion is dropped inward in the tire axial direction of the flange, and the remaining portion of the bead portion is gradually dropped inward in the axial direction of the flange. A method of assembling a tire into a tire, wherein a position in a tire circumferential direction of a maximum dynamic unbalance portion of the tire measured and mounted on a rim of a tire testing machine is the deepest of the other bead portions as viewed from a tire rotation axis. A method for assembling a tire to a rim, wherein the tire is assembled to the rim so as to be in the same direction as the drop portion and in the same axial direction of the tire. 6. A marking indicating a circumferential position of the maximum dynamic unbalance portion is provided on a side surface of the tire, and the circumferential position of the marked tire is in the same direction as a deepest drop portion of the other bead portion. The method for assembling a tire to a rim according to claim 5, wherein the tire is assembled to the rim such that 7. After dropping one bead between both flanges of the rim, part of the other bead is dropped inside the flange in the tire axial direction and temporarily fixed with a jig, which is different from the jig. The bead dropping means and the rim disposed at the tire circumferential direction position are relatively moved along the circumferential direction of the rim, and the bead dropping means causes the bead positioned outside the flange in the axial direction to move in the axial direction of the flange. A method for assembling a tire to a rim that is gradually dropped inward, wherein the tire is mounted on the rim of a tire tester and measured from the position in the tire circumferential direction of the heaviest part of the dynamic unbalance of the tire measured.
° A method of assembling a tire to a rim, wherein the jig is attached to a position up to a forward position. 8. A marking indicating a circumferential position of the heaviest part of the dynamic unbalance is provided on a side surface of the tire, and the jig is attached between the marked position and a position 90 ° away from the marked position. The method for assembling a tire to a rim according to claim 7, wherein: 9. The method for assembling a tire to a rim according to claim 3, wherein static imbalance correction is performed after the tire is assembled to the rim.