JP2002172919A - Rro and/or rfv reducing method for tire and rim assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce RRO primary - N-th component and/or RFV primary - N-th component of a tire and rim assembly by regulating the phase and the magnitude of RRO primary - N-th component and/or RFV primary - N-th component due to unevenness on a periphery of bead foot width in a rim assembly state. SOLUTION: A tire and rim assembly 14 is filled with air. RRO measurement is effected to extract a RRO primary component. When a tire side wall 16 in a bottom position of the RRO primary component is pressed toward the inner side of a tire, a bead part 18 in the vicinity of the bottom position of the RRO primary component is moved to the rim flange 20 side and a gap 22 between a rim flange 20 and the back of the bead I decreased or quenched. This constitution regulates the position in a tire radial direction on a tread surface in the bottom of the RRO primary component to the outside in a tire radial direction and RRO is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for reducing RRO (radial runout) and / or RFV (radial force variation) of a tire / rim assembly.

[0002]

2. Description of the Related Art There is a gap (space) between a tire bead portion and a rim flange after a normal rim assembly and air filling and the rim flange due to the influence of a bead shape and a rim hump. Improper state has been forced.

[0003]

However, in the conventional method of making the fitted state uniform on the periphery, the minimum value (RRO-
Rim alone (RRO).

In addition, when a tire / rim assembly adjusted based on RRO and / or RFV measured at a specific speed is used, when running at a specific speed, good results are obtained, RR at high speed (or low speed)
O and / or RFV sometimes deteriorated.

[0005] In consideration of the above fact, the present invention provides a first order component of RRO, an Nth order component of RRO, a first order component of RFV, and an Nth order component of RFV due to non-uniform bead foot width in a rim assembly state. By adjusting at least one phase / size, etc., one of the RROs of the tire / rim assembly can be further increased.
A first object is to reduce at least one of the N-order component and the first to N-order components of RFV. The second purpose is to obtain the first to Nth order components of RRO with increasing speed, and RF
It is to suppress at least one deterioration of the first to Nth order components of V.

[0006]

According to the first aspect of the present invention, an RR of a tire / rim assembly having a tire mounted on a rim is provided.
O and / or RFV reduction method, wherein RR of tire alone is
O primary component, RRO N order component, RFV primary component and RFV N order component, and RR of tire / rim assembly
Adjusting the position of the bead portion of the tire based on at least one of the primary component of O, the N-order component of RRO, the primary component of RFV, and the N-order component of RFV;
Is reduced.

Next, a method for reducing RRO and / or RFV of a tire / rim assembly according to claim 1 will be described.

[0008] The R of the tire / rim assembly according to claim 1
In the RO and / or RFV reduction method, for example, by adjusting the position on the rim of the bead portion of the tire according to at least one of the primary component of RRO and the N-order component of RRO obtained by measuring RRO. The adjustment of the radial position of the tread surface in the tire radial direction is adjusted, and the RRO is reduced. The primary component of RRO and the N-order component of RRO used here may be those of the tire alone or those of the tire / rim assembly.

For example, if the position of a certain portion of the bead portion is shifted inward in the axial direction of the tire (in a direction away from the rim flange) from a regular position on the rim, the tread portion radially outside of the certain portion is shifted inward in the tire radial direction. (The primary component of RRO is the bottom position when represented by a graph), 180
On the opposite side, the tread portion tends to shift outward in the tire radial direction (the primary component of the RRO becomes a peak position in a graph).

Therefore, an unnecessary gap (space) may be interposed between the bead portion indicating the bottom position of the RRO primary component and the rim flange. For example, the position of the bead portion is adjusted so as to eliminate this gap. Adjust it.

When the adjustment is performed with attention paid to the N-order component of RRO, a plurality (N) of peaks (or bottoms)
Appears in the graph. For example, an unnecessary gap (space) may be interposed between the bead portion indicating the bottom position of the N-order component of RRO and the rim flange.
The position of the bead portion may be adjusted so as to eliminate this gap.

The RV obtained by measuring the RFV in the same manner
The position of the bead portion of the tire on the rim is adjusted according to at least one of the primary component of the FV and the Nth component of the RFV.
FV can also be reduced.

[0013] At least one of the primary component of RRO of the tire / rim assembly and the N-order component of RRO, and RFV
Can also be adjusted based on at least one of the first order component and / or the Nth order component of RFV.
And RFV can both be reduced.

Further, the adjustment can be performed based on at least one of the primary component of RRO and the N-order component of RRO of the tire alone and at least one of the primary component of RFV and the N-order component of RFV. RRO and RF
V can also be reduced.

According to a second aspect of the present invention, there is provided the method for reducing the RRO and / or RFV of the tire / rim assembly according to the first aspect, wherein the primary component of the RRO of the tire alone, the N component of the RRO,
The primary component, the primary component of RFV and the Nth component of RFV, and the primary component of RRO of the tire / rim assembly, N of RRO
At least one of the next component, the first component of the RFV, and the Nth component of the RFV, a bead portion directed toward the plus side of the waveform has a narrower foot width relative to other portions, and / or a tire / rim assembly Of the first-order component of RRO, the N-order component of RRO, the first-order component of RFV, and the N-th component of RFV, the foot width of the bead portion directed to the minus side of the waveform relative to the other portion. RRO and / or RFV can be reduced by making adjustments widely.

Next, a method for reducing RRO and / or RFV of the tire / rim assembly according to the second aspect will be described.

In the tread portion of the tire, the primary component of RRO of the tire alone, the Nth component of RRO, the primary component of RFV and the Nth component of RFV, the primary component of RRO of the tire / rim assembly, the Nth component of RRO The bead portion directed to the plus side of at least one of the component, the first-order component of the RFV, and the Nth-order component of the RFV may have a relatively larger radius than the other portions.

In such a case, the first-order component of RRO, the N-order component of RRO, the first-order component of RFV, and R
By adjusting the foot width of the bead portion directed to the plus side of at least one waveform of the N-order component of the FV to be relatively narrow with respect to the other portions, the width of this relatively large portion is adjusted. The radius can be reduced, which results in RR
O and / or RFV can be reduced.

In the tread portion, the RR described above is used.
O primary component, RRO N-order component, RFV primary component,
In some cases, the bead portion directed to the minus side of at least one waveform of the Nth-order component of the RFV has a smaller radius than the other portions.

In such a case, the first-order component of RRO, the N-order component of RRO, the first-order component of RFV, and R
By adjusting the foot width of the bead portion directed to the plus side of at least one of the N-order components of the FV relatively wide with respect to the other portions, the width of the relatively small portion is reduced. The radius can be increased, which results in RR
O and / or RFV can be reduced.

Either the foot width of the bead portion directed to the plus side of the waveform or the foot width of the bead portion directed to the minus side may be adjusted, or both may be adjusted.

According to a third aspect of the present invention, there is provided a method for reducing RRO and / or RFV of a tire / rim assembly according to the first or second aspect, wherein the tire / rim assembly is filled with a gas and the RRO and / or RFR is reduced. Measure RFV and determine the primary component of RRO, the Nth component of RRO, the primary component of RFV, and RF
Pressing the tire sidewall portion, which points to at least one bottom position of the N-order component of V, toward the tire inside,
The gap between the rim flange near the bottom position and the rear surface of the bead is reduced.

Next, a method for reducing RRO and / or RFV of the tire / rim assembly according to the third aspect will be described.

The R of the tire / rim assembly according to claim 3
In the RO and / or RFV reduction method, for example, first, a tire / rim assembly is filled with gas to measure the RRO.

Next, when the tire sidewall portion which directs the bottom position of the primary component of the RRO is pressed toward the inside of the tire, the bead portion which directs the vicinity of the bottom position of the primary component of the RRO moves toward the rim flange due to the reaction. The gap between the rim flange and the back of the bead is reduced. And R
The tire radial position of the tread surface portion that points to the bottom position of the primary component of the RO is adjusted outward in the tire radial direction, and the RRO is reduced.

Here, the tire sidewall portion directed to the bottom position of the N-order component of RRO may be pressed toward the inside of the tire, whereby the bead portion directed to the vicinity of the bottom position of the N-order component of RRO may be formed. Moving to the rim flange side, the gap between the rim flange and the back of the bead decreases. Then, the position in the tire radial direction of the tread surface portion that points to the bottom position of the N-order component of RRO is adjusted outward in the tire radial direction, and RRO is reduced.

It is also possible to measure the RFV of the tire / rim assembly and press the tire sidewall portion directed to the bottom position of at least one of the primary component and the Nth component of the RFV into the tire to reduce the RFV. .

Further, both RRO and RFV can be reduced.

Note that the bottom position of the N-order component of RRO and the N-order component of RFV indicates a portion having the largest negative value.

According to a fourth aspect of the present invention, there is provided an RR for a tire / rim assembly according to any one of the first to third aspects.
O and / or RFV reduction method, RR of tire alone
The bottom part of the RRO primary component or the RFV primary component is dropped into the drop center of the rim by dropping a bead portion pointing to any one of the peak positions of the O primary component and the RFV primary component, the RRO primary component of the tire / rim assembly, and the RFV primary component. It is characterized in that a bead portion directed to the position is mounted on the rim bead seat, and air is filled in a state where the tire is biased to the bottom side of the RRO primary component or the RFV primary component.

Next, a method for reducing RRO and / or RFV of a tire / rim assembly according to a fourth aspect will be described.

For example, when reducing the RRO, first, the RRO of the tire alone or the tire / rim assembly is measured, and the peak position of the RRO primary component of the tire alone or the tire / rim assembly is obtained.

Next, the bead portion pointing to the peak position of the RRO primary component is dropped into the drop center of the rim, the bead portion pointing to the bottom position of the RRO primary component is put on the rim bead seat, and the tire is moved to the RRO primary component. (The bottom of the primary component of the RRO of the tire alone or the tire / rim assembly is
The tire and rim assembly is in a state of protruding most outward in the tire radial direction. ).

Next, when air is filled in this state, the bead portion at the peak position dropped into the drop center moves to the rim flange side due to the internal pressure.

As described above, first, the bottom side of the primary component of the RRO of the tire alone or the tire / rim assembly is made to protrude most outward in the tire radial direction in the tire / rim assembly. A reduced tire / rim assembly is obtained.

When reducing the RFV, the RFV of the tire alone or the tire / rim assembly is measured, and the RFV is measured.
The bead portion pointing to the peak position of the primary component is dropped into the drop center of the rim, and then filled with air.
This results in a tire / rim assembly with reduced RFV.

According to a fifth aspect of the present invention, there is provided an RR of a tire / rim assembly according to any one of the first to fourth aspects.
In the O and / or RFV reduction method, a plurality of protrusions are provided on both flanges of the rim along the circumferential direction in which the amount of protrusion toward the bead portion is adjustable, and a primary component of RRO, an N-order component of RRO, and a primary component of RFV are provided. , And the protrusion amount of the protrusion close to the portion directing at least one peak position of the N-order component of RFV is large, the primary component of RRO, the N-order component of RRO, R
It is characterized in that the protrusion amount of the protrusion close to the portion directing at least one bottom position of the primary component of the FV and the Nth component of the RFV is adjusted to be relatively small or zero.

Next, a method for reducing RRO and / or RFV of a tire / rim assembly according to a fifth aspect will be described.

First, a plurality of projections are provided on both flanges of the rim, the projections of which can be adjusted to the bead portion side along the circumferential direction, and the projections of all the projections are previously adjusted to be constant.

Next, a tire is mounted on the rim, filled with gas, and, for example, RRO is measured.

The protrusion amount of the protrusion close to the portion directing the peak position of the primary component of the RRO is large, and the protrusion amount of the protrusion close to the portion directing the bottom position of the primary component of the RRO is relatively small or zero. When the adjustment is performed, the tread surface position corresponding to the peak position of the primary component of the RRO is adjusted inward in the tire radial direction, and the tread surface position corresponding to the bottom position of the primary component of the RRO is adjusted outward in the tire radial direction. RRO is reduced.

Also, the protrusion amount of the protrusion close to the portion directing the peak position of the N-order component of RRO is large, and the protrusion amount of the protrusion close to the portion directing the bottom position of the N-order component of RRO is relatively small or When adjusted to zero, the tread surface position corresponding to the peak position of the N-order component of RRO is adjusted inward in the tire radial direction, and the tread surface position corresponding to the bottom position of the N-order component of RRO is adjusted outward in the tire radial direction. ,
As a result, RRO is reduced.

Note that the bottom position of the primary component of RRO is
RRO can also be reduced by making adjustments based on both the bottom position of the N-order component of RRO.

Further, the RFV is measured, and the amount of protrusion of the protrusion close to at least one of the portion directing the peak position of the primary component of the RFV and the portion directing the peak position of the Nth-order component of the RFV is increased. The protrusion amount of the protrusion close to at least one of the portion pointing to the peak position of the primary component and the portion pointing to the bottom position of the N-order component of RFV may be adjusted to be relatively small or zero. Thereby, RFV can be reduced.

Incidentally, both RRO and RFV can be reduced.

According to a sixth aspect of the present invention, there is provided a tire / rim assembly according to any one of the first to fifth aspects.
The O and / or RFV reduction method is characterized in that a volatile lubricant or a lubricant which solidifies later is applied to at least one of the bead portion and the rim, and the tire is mounted on the rim.

Next, a method for reducing RRO and / or RFV of a tire / rim assembly according to a sixth aspect will be described.

The R of the tire / rim assembly according to claim 6
In the RO and / or RFV reduction method, a volatile lubricant or a lubricant that solidifies later is applied to at least one of the bead portion and the rim, and the tire is mounted on the rim.
In the tire / rim assembly after the O and / or RFV is reduced, the displacement of the bead portion of the tire can be suppressed, and the reduced RRO and / or RFV can be maintained for a long time.

According to a seventh aspect of the present invention, an RR of a tire / rim assembly according to any one of the first to sixth aspects is provided.
In the O and / or RFV reduction method, a tire and a rim are selected such that a bead tightening force when the tire is mounted on the rim is 2 kN or more, and the selected tire is mounted on the rim. And

Next, a method for reducing RRO and / or RFV of a tire / rim assembly according to a seventh aspect will be described.

In general, the inner diameter of the bead portion of the tire varies, for example, between manufacturers and brands.

Therefore, depending on the combination of the rim and the tire, a tire / rim assembly having a weak bead tightening force and a tire / rim assembly having a strong bead tightening force may occur.

As a matter of course, a tire / rim assembly having a weak bead tightening force is not suitable for a tire / rim having a strong bead tightening force.
The bead portion tends to shift as compared with the rim assembly.

Therefore, if the displacement of the bead portion of the tire is suppressed and the state where the RRO is reduced for a long period is maintained, a tire and a rim having a bead tightening force of 2 kN or more should be selected. It is preferred to have a tire and rim assembly.

If the bead tightening force is less than 2 kN, the effect of suppressing the displacement of the bead portion is insufficient.

According to an eighth aspect of the present invention, there is provided an RR for a tire / rim assembly according to any one of the first to seventh aspects.
In the O and / or RFV reduction method, RRO and / or R
A filler is injected into a gap between the rim and the tire of the tire / rim assembly having reduced FV.

The R of the tire / rim assembly according to claim 8
In the RO and / or RFV reduction method, RRO and / or RF
Since the filler is injected into the gap between the rim and the tire of the V-reduced tire / rim assembly, the gap between the bead portion and the rim is filled with the filler.

Since the filler eliminates the gap (air pocket) between the rim and the bead portion, the fitting between the bead portion and the rim becomes strong and the displacement of the bead portion of the tire can be suppressed. RRO and / or RF for a long time
The state where V is reduced can be maintained.

According to a ninth aspect of the present invention, there is provided an RR for a tire / rim assembly according to any one of the first to eighth aspects.
In the O and / or RFV reduction method, RRO and / or R
The FV is measured at two speeds, low speed and high speed, and at least one of a primary component waveform of RRO, an N-order component waveform of RRO, a primary component waveform of RFV, and an N-order component waveform of RFV, Modified weight is added to the tread corresponding to the part that changes in the negative direction at high speed, and RRO
This is characterized in that deterioration of characteristics due to an increase in speed of at least one of the first-order component of RRO, the Nth-order component of RRO, the first-order component of RFV, and the Nth-order component of RFV is suppressed.

Next, a method for reducing RRO and / or RFV of the tire / rim assembly according to the ninth aspect will be described.

RRO and / or RFV can be set to low speed and high speed.
The primary component waveform of RRO, N of RRO
When a correction weight is given to a tread portion corresponding to a portion that changes in the negative direction at high speed among at least one of the next component waveform, the primary component waveform of RFV, and the Nth component waveform of RFV, The increase in the mass of the portion provided with is suppressed in the above-described negative direction, and the primary component of RRO, the Nth component of RRO, the primary component of RFV, and the Nth component of RFV due to the speed increase Deterioration of at least one characteristic can be suppressed.

The material and shape of the correction weight are not particularly limited as long as it can be attached to the tire. The position where the correction weight is attached may be outside the tread portion or inside the tread portion, and the method of attaching the correction weight is not particularly limited, such as adhesion and double-sided tape.

According to a tenth aspect of the present invention, there is provided a tire / rim assembly according to any one of the first to ninth aspects.
In the RO and / or RFV reduction method, RRO and / or RFV are measured at two speeds, low speed and high speed, and the primary component waveform of RRO, the N-order component waveform of RRO, the primary component waveform of RFV, and the N-order component waveform of RFV Of the at least one of the waveforms, a tread portion corresponding to a portion that changes in the positive direction at high speed is partially removed, and a primary component of RRO, R
It is characterized in that deterioration of characteristics due to an increase in speed of at least one of the Nth-order component of RO, the first-order component of RFV, and the Nth-order component of RFV is suppressed.

Next, a method for reducing the RRO and / or RFV of the tire / rim assembly according to the tenth aspect will be described.

The RRO and / or RFV can be set to low speed and high speed.
The primary component waveform of RRO, N of RRO
When at least one of the next component waveform, the primary component waveform of RFV, and the Nth component waveform of RFV, a tread portion corresponding to a portion that changes in the positive direction at high speed is partially deleted, the tread portion is deleted. The mass of the portion is reduced, and as a result, the above-described change in the positive direction is suppressed, and at least one of the first-order component of RRO, the Nth-order component of RRO, the first-order component of RFV, and the Nth-order component of RFV due to the speed increase. One characteristic deterioration can be suppressed.

As a method of reducing the mass by removing the tread portion, grinding with a grinder, cutting with a knife, drilling with a drill, and the like can be used, but any method may be used. It should be noted that the method of removing and the grinding portion should be performed with care so as not to adversely affect other performances.

[0067]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of a method for reducing RRO and / or RFV of a tire / rim assembly according to the present invention.
The embodiment will be described with reference to FIGS. (1) First, as shown in FIG. 1B, the tire 12 is assembled to the rim 10 by a normal method to obtain a tire / rim assembly 14. (2) Fill the air so that the air pressure corresponds to the tire 12. (3) R of the tire / rim assembly 14 using a tire testing machine
The RO is measured and the RRO primary component is extracted.

FIG. 2 shows the measurement results of the bead foot width.

FIG. 3 shows the measurement results of RRO, where a thin dotted line represents RRO and a thick dotted line represents a primary component of RRO. (4) Next, when the tire sidewall 16 (indicated by a dotted line in FIG. 1) at the bottom position of the primary component of RRO is pressed inwardly of the tire (in the direction of arrow A in FIG. 1), the reaction is caused by the reaction shown in FIG.
As shown by the solid line in (A), the bead portion 18 (near the bead heel) near the bottom position of the RRO primary component moves to the rim flange 20 side, and the gap 22 between the rim flange 20 and the bead back surface decreases or disappears. Due to the reduction or disappearance of the gap 22, the foot width (the width W from one bead heel to the other bead heel) is increased as shown in FIG. 2 (FIG. 2).
Shows the amount of change from the reference foot width (for one rotation of the tire). As a result, the radial position of the tread surface at the bottom position of the RRO primary component in the tire radial direction is adjusted outward in the tire radial direction, and the RRO is reduced as shown by the measurement results in FIG. 3 (the thin solid line indicates the adjusted RRO). And the thick solid line indicates the RR after adjustment.
O primary component).

FIG. 4 shows the RF of the tire / rim assembly 14.
The measurement result of V is shown, and it can be seen that RFV is improved after the adjustment.

The RFV was measured and the extracted RF
RFV can be reduced by pressing the tire sidewall 16 at the bottom position of the V primary component toward the inside of the tire. [Second Embodiment] Next, a second embodiment of a method for reducing RRO and / or RFV of a tire / rim assembly according to the present invention will be described with reference to FIG. The same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

First, the RRO is measured for the tire 12 alone,
The peak position of the RRO primary component of the tire 12 alone is obtained.

Next, as shown by the dotted line in FIG. 5B, the bead portion 18 at the peak position is dropped into the drop center 24 of the rim 10. As a result, the bead portion 18 at the bottom position of the RRO primary component on the opposite side rides on the rim bead seat (from the state of the dotted line to the state of the solid line) as shown in FIG. (The bottom side of the primary component of the RRO of the tire 12 alone projects most outward in the tire radial direction in the tire / rim assembly 14).

Next, when air is filled in this state, the bead portion 18 at the peak position dropped into the drop center 24 moves toward the rim flange 20 due to the internal pressure (from the dotted line to the solid line).

As described above, first, the RR of the tire 12 alone is
Since the bottom side of the primary component of O is protruded to the outermost side in the tire radial direction in the tire / rim assembly 14, the air is filled, so that the tire / rim assembly 14 with reduced RRO is obtained.

When the RFV is to be reduced, the RFV of the tire 12 alone or the tire / rim assembly 14 is measured, and the bead portion 1 which directs the peak position of the primary component of the RFV is measured.
8 may be dropped into the drop center of the rim 10 and then filled with air. As a result, the tire / rim assembly 14 with reduced RFV is obtained. Third Embodiment Next, a third embodiment of the method for reducing RRO and / or RFV of a tire / rim assembly according to the present invention will be described with reference to FIG. The same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 6, a plurality of screw holes 30 are formed in the rim flange 20 of the rim 10 at equal intervals in the circumferential direction. A screw hole 30 is also formed in the opposite rim flange (not shown).

The number of screw holes 30 is one rim flange 2
Six or more with respect to 0 are preferable. In the present embodiment, six screw holes 30 are formed in each rim flange 20.

The axis of the screw hole 30 is preferably parallel to the rim rotation axis.

An adjusting screw 32 having a slot formed therein is screwed into each screw hole 30 from the outside of the rim flange 20. By turning the adjusting screw 32 with a flathead screwdriver or the like, the inner surface of the rim flange 20 is rotated. The amount of protrusion of the adjustment screw 32 is adjustable.

Next, the adjustment procedure will be described. (1) First, all the adjustment screws 32 are made to protrude from the inner surface of the rim flange 20 by a certain dimension. (2) The tire / rim assembly 14 is obtained by assembling the tire 12 with the rim 10 by an ordinary method. (3) Fill the air so that the air pressure corresponds to the tire 12. (4) R of the tire / rim assembly 14 using a tire testing machine
The RO is measured and the RRO primary component is extracted. (5) Next, the amount of protrusion is reduced by adjusting the adjustment screw 32 closest to the bottom position of the RRO primary component (FIG. 6).
(See (A)), the width of the gap 22 is reduced, and the foot width is increased. When the adjustment screw 32 closest to the peak position of the RRO primary component is adjusted to increase the amount of protrusion, the width of the gap 22 increases, and the foot width decreases (see FIG. 6B).

As a result, the tire radial position on the tread surface at the peak position of the RRO primary component is adjusted inward in the tire radial direction, and the tire radial position on the tread surface at the bottom position of the RRO primary component is adjusted outward in the tire radial direction. And the RRO is reduced.

The RFV is measured, and the adjusting screw 32 closest to the bottom position of the primary component of RFV is adjusted to reduce the amount of protrusion, and the adjusting screw 32 closest to the peak position of the primary component of RFV is adjusted to reduce the amount of protrusion. If it is large, the RFV can be reduced. [Fourth Embodiment] Next, a fourth embodiment of a method for reducing RRO and / or RFV of a tire / rim assembly according to the present invention will be described with reference to FIG. The same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 7, the rim 10 of this embodiment
A hole 31 having a bottom is formed on the inner surface side of the rim flange 20 in place of the screw hole 30 penetrating therethrough.
Has a projection 33 inserted therein.

Next, the adjustment procedure will be described. (1) First, the RRO of the tire 12 alone is measured,
Extract the RRO primary component. (2) Next, the tire 12
Is mounted on the rim 10, a short protrusion 33 is inserted into the hole 31 closest to the bottom position of the RRO primary component of the tire 12 alone (see FIG. 7A), and the RRO of the tire 12 alone is
A long projection 33 is inserted into the hole 31 closest to the peak position of the RO primary component (see FIG. 7B). (3) Thereafter, the tire 12 is assembled to the rim 10 by a usual method, and air is filled.

By inserting the protrusions 33 having different lengths as described above, the tire radial position on the tread surface at the peak position of the RRO primary component is adjusted inward in the tire radial direction, and at the bottom position of the RRO primary component. Of the tread surface in the tire radial direction is adjusted outward in the tire radial direction, and the tire / rim assembly 14 with reduced RRO is obtained.

It is preferable to take the following countermeasures so as to keep the RRO reduced as described above.

For example, it is preferable to apply a volatile lubricant or a lubricant that solidifies later to at least one of the bead portion 18 and the rim 10 and mount the tire 12 on the rim 10. The action of the lubricant makes the bead portion 18 slippery and easy to mount on the rim 10.

As the volatile lubricant, for example, Moutie
r Paste (manufactured by TipTop) or the like can be used.

As a lubricant which solidifies later, for example, Be
ad Sealer (manufactured by Tech International) or the like can be used.

After the RRO is reduced, the lubricant is dried or solidified, so that the frictional force between the bead portion 18 and the rim 10 increases, so that the displacement of the bead portion 18 can be suppressed, and the The reduced state of RRO can be maintained throughout.

Also, in order to maintain the reduced RRO state for a long period of time, the tire 12 has a bead tightening force of 2 kN or more when the tire 12 is mounted on the rim 10.
And the rim 10 and select the selected tire 12 to the rim 1
It is preferable to attach to zero. The bead clamping force comprises eight test rim segments (range 45 °) that can be moved radially outward to spread the bead, and
It is a force that can be measured in an inspection facility equipped with a force measuring device on each of the inspection rim segments and acts in a radial direction when the bead portion is evenly extended.

Further, a filler may be injected into a gap between the rim 10 and the tire 12 of the tire / rim assembly 14 with reduced RRO.

An example of a method for injecting a filler will be described below.

A plurality of small-diameter through holes 34 are formed in the rim 10 along the circumferential direction.

Next, as shown in FIG. 8, a filler 38 is injected from the through hole 34 of the rim 10 using an injection device 36.

[0097] As the filler 38, for example, SE9530A manufactured by Toray Downing Silicon Co., Ltd. can be used. As the injection device 36, for example, a piston type device such as a syringe can be used. This is preferably performed for all the through holes 34.

As a result, the air accumulated between the rim 10 and the bead portion 18 is pushed out to the outside between the rim flange 20 and the bead portion 18 or through the through hole 34 due to the entry of the filler 38, The gap between the rim 10 and the bead portion 18 is eliminated.

Thereafter, since the filler 38 is solidified, the fitting between the rim 10 and the bead portion 18 becomes firm, and the RR
The state where O is reduced can be maintained for a long time, and high steering stability can be ensured.

In this embodiment also, the RFV can be measured, and the protrusion 33 can be adjusted based on the primary component of the RFV, whereby the RFV can be reduced. Fifth Embodiment A method for reducing the RFV of a tire / rim assembly will be described with reference to FIGS. In addition,
The same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. (1) First, the tire 12 is mounted on the rim 10 by a normal method, and air is filled so as to have an air pressure corresponding to the tire 12. The RFV of the tire / rim assembly 14 thus obtained is measured, and the first and second order components of the RFV are extracted. The measurement result of the RFV is the thicker line in the graph shown in FIG. In addition, the bead foot width at this time is the thicker line in the graph shown in FIG. (2) Next, the tire 12 is once removed from the rim 10, and a thin spacer 40 is attached to the inner surface of the rim flange corresponding to the portion of the first and second order components of the RFV in which the minus direction is directed, as shown by the solid line in FIG. As shown by a two-dot chain line in FIG. 11, a thick spacer 40 is attached to the inner surface of the rim flange corresponding to the portion of the first and second order components of the RFV that directs plus.

The spacer 40 has a length of 20 mm,
It is a strip with a width of 4 mm and has 11 thicknesses in 0.1 mm increments from 0.5 mm to 1.5 mm, 36 on the inner surface of one rim flange at 10 ° intervals, and on the inner surface of the other rim flange. Also 36 at 10 ° intervals, total 72 on both sides
Used.

The spacer 40 was attached so that its longitudinal direction was aligned with the rim circumferential direction. (3) Thereafter, the tire 12 is mounted on the rim 10 so as to have the same initial positional relationship, and air is filled.

By attaching the spacers 40 having different thicknesses as described above, the foot width is adjusted as shown by the thin line in the graph of FIG. 10, and as a result, the tread surface portion which directs the plus of the RFV1 and second-order components The tire radial position is adjusted inward in the tire radial direction, and the tire radial position of the tread surface portion that directs the minus of the RFV1 to second order components is adjusted outward in the tire radial direction, as shown by the thin line in the graph of FIG. Accordingly, the first and second order components of the RFV are reduced.

By attaching the spacer 40 as described above based on the primary and secondary components of RRO,
The primary and secondary components of OC can also be reduced. [Sixth Embodiment] FIG. 1 shows an RFV reduction method for a tire / rim assembly.
This will be described with reference to FIGS. The same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. (1) First, the tire 12 is assembled to the rim 10 by a normal method to obtain a tire / rim assembly 14. In the present embodiment, for example, the rim 10 provided with the adjusting screw 32 is used. (3) Fill the air so that the air pressure corresponds to the tire 12. (4) R of the tire / rim assembly 14 using a tire testing machine
The FV is measured at a speed of 15 km / h and a speed of 120 km / h to extract the first and second order components of the RFV (see FIG. 12). (5) Next, based on the measurement result of the RFV at a speed of 15 km / h, the adjustment screw 32 is adjusted so that the first and second order components of the RFV are reduced.

After the adjustment, the R of the tire / rim assembly 14 is again
The FV is measured at a speed of 15 km / h and a speed of 120 km / h to extract the primary and secondary components of the RFV.

After the adjustment, the RFV at the speed of 15 km / h is reduced as shown in the graph of FIG.
The first and second order components of RFV at 20 km / h are not sufficiently reduced.

Here, the speed 120 in the graph shown in FIG.
Looking at the first and second order components of RFV at km / h,
The tire 12 is once removed from the rim 10 since the vicinity of about 350 ° to 350 ° is on the minus side, and three places (200 °, 255 °, 310 °) on the inner surface of the tread within 150 ° to 350 °.
°) as shown in FIG.
5g) 42 is adhered to the inner liner side at the center in the width direction of the tread portion, and the tire 12 is assembled to the rim 10 again so as to have the same initial positional relationship, and air is filled.

As a result, as shown in FIG.
After reducing the first and second order components of RFV at 5 km / h,
The first and second order components of RFV at a speed of 120 km / h can be reduced.

In the present embodiment, the correction weight 42
Using a double-sided adhesive tape having a width of 50 mm and a thickness of 1 mm manufactured by Nitto Dengeki Co., Ltd., the mass was adjusted according to the length. The correction weight 42 was adhered so that its length direction coincided with the circumferential direction of the tread. [Other Embodiments] In the above-described Embodiments 1 to 4, RRO was measured and extracted RR
Although the RRO was reduced based on the primary component of O (and as a result, the RFV was also reduced), the RRO could also be reduced based on the Nth-order component of the RRO. Of course, the RFV can be reduced based on the first-order component and / or the Nth-order component.

In the fifth and sixth embodiments, the RFVs of 1 to 2
Although the next component has been reduced, it is needless to say that the third-order and higher-order components of RFV can be reduced, and the primary component of RRO and / or the N-order component of RRO can also be reduced. .

In any case, the primary component of RRO, the N-order component of RRO, the primary component of RFV, and R
N-order component of FV, and RR of tire / rim assembly 14
By adjusting the position of the bead portion 18 of the tire 12 based on at least one of the primary component of O, the N-order component of RRO, the primary component of RFV, and the N-order component of RFV,
The RRO and / or RFV of the rim assembly 14 can be reduced.

[0112]

As described above, the tire of the present invention
According to the RRO and / or RFV reduction method of the rim assembly,
This has an excellent effect that at least one or all of the primary component of RRO, the primary component of RRO, the primary component of RFV, and the primary component of RFV of the tire / rim assembly can be further reduced.

According to the method for reducing the RRO and / or the RFV of the tire / rim assembly according to the sixth to eighth aspects, the displacement of the bead portion can be suppressed, and the RR can be maintained for a long period of time.
This has an excellent effect that a state where O and / or RFV is reduced can be maintained.

According to the method for reducing the RRO and / or RFV of the tire / rim assembly according to the ninth and tenth aspects, the first-Nth order component of the RRO and / or the first-Nth order component of the RFV associated with the speed increase. The deterioration of the next component can be suppressed,
It has an excellent effect.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of the vicinity of a bead portion and a rim flange of a tire / rim assembly according to a first embodiment;
(B) is a sectional view (one side) of the tire / rim assembly.

FIG. 2 is a graph showing a change in foot width of a bead portion of a tire.

FIG. 3 is a graph showing changes in RRO and RRO primary components of a tire / rim assembly.

FIG. 4 is a graph showing changes in RFV and RFV primary components of a tire / rim assembly.

FIG. 5A is a cross-sectional view showing the vicinity of a bead portion at the bottom position of an RRO primary component (tire only) of a tire / rim assembly according to a second embodiment, and FIG. FIG. 4 is a cross-sectional view near the bead portion at the peak position of FIG.

FIGS. 6A and 6B are cross-sectional views of the vicinity of a bead portion and a rim flange of a tire / rim assembly according to a third embodiment.

FIGS. 7A and 7B are cross-sectional views of the vicinity of a bead portion and a rim flange of a tire / rim assembly according to a fourth embodiment.

FIG. 8 is a sectional view of the vicinity of a bead portion and a rim flange when a filler is injected into a gap.

FIG. 9 is a graph showing RFV and first and second order components of RFV before and after adjustment.

FIG. 10 is a graph showing bead foot widths before and after adjustment.

FIG. 11 is a sectional view of the vicinity of a bead portion and a rim flange of the tire / rim assembly.

FIG. 12 shows two levels of RFV and RFV before adjustment.
4 is a graph showing a second-order component.

FIG. 13 is a graph showing RFV after adjustment based on RFV measurement results at a speed of 15 km / h, and first and second order components of RFV.

FIG. 14 is a cross-sectional view of the tire / rim assembly to which the correction weight has been attached.

FIG. 15: RFV and RFV after pasting the correction weight
3 is a graph showing first- and second-order components.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rim 12 Tire 14 Tire / rim assembly 16 Side wall 18 Bead part 20 Rim flange 24 Drop center 33 Projection 32 Adjusting screw (projection) 38 Filler 40 Spacer (projection) 42 Correction weight

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B60C 15/02 B60C 15/02 J 25/00 25/00 G01M 1/28 G01M 1/28

Claims (10)

[Claims] 1. A method for reducing RRO and / or RFV of a tire / rim assembly in which a tire is mounted on a rim, comprising: a primary component of RRO of a tire alone; an N-order component of RRO;
The primary component of FV and the N-order component of RFV,
The primary component of the RRO of the rim assembly, the Nth component of the RRO, R
Adjusting the position of the bead portion of the tire based on at least one of the primary component of the FV and the Nth component of the RFV;
Tire characterized by reducing O and / or RFV
A method for reducing RRO and / or RFV of a rim assembly. 2. The primary component of RRO of a tire alone, RRO
Nth order component, the first order component of RFV and the Nth order component of RFV,
Furthermore, the primary component of the RRO of the tire / rim assembly, RRO
The width of the bead portion directed to the plus side of at least one of the Nth-order component of the RFV, the first-order component of the RFV and the Nth-order component of the RFV is relatively narrow with respect to other portions, and / or the tire rim The foot width of the bead portion directed to the minus side of at least one of the primary component of the RRO, the N-order component of the RRO, the primary component of the RFV, and the N-order component of the RFV of the assembly is set with respect to the other portions. The RRO and / or RFV reduction method for a tire / rim assembly according to claim 1, wherein the RRO and / or RFV is reduced by relatively adjusting the RRO and / or RFV. 3. Filling the tire / rim assembly with a gas
Measure RO and / or RFV and determine the primary component of RRO, RR
A rim flange in the vicinity of the N-order component of O, the first-order component of RFV, and at least one of the N-order components of RFV, which presses the tire sidewall portion toward the bottom position toward the inside of the tire; The RRO and / or RFV of the tire / rim assembly according to claim 1 or 2, wherein a gap between the back surfaces of the beads is reduced.
Reduction method. 4. The primary component of RRO and RFV of a tire alone
Primary component, RRO primary component of tire / rim assembly and R
Drop the bead portion pointing to any one of the peak positions of the FV primary component into the drop center of the rim and RRO
A bead portion directed to the bottom position of the primary component or the primary component of the RFV is laid on the rim bead seat, and air is filled in a state where the tire is biased toward the bottom of the primary component of the RRO or the primary component of the RFV. The R of the tire / rim assembly according to any one of claims 1 to 3.
RO and / or RFV reduction method. 5. A plurality of projections, each of which can adjust the amount of projection toward the bead side, are provided on both flanges of the rim along the circumferential direction, and a primary component of RRO, an N-order component of RRO, a primary component of RFV, and RFV The protrusion amount of the protrusion close to the portion pointing to at least one peak position among the N-order components of the RRO is large. The primary component of the RRO, the N-order component of the RRO, the primary component of the RFV, and the N-order component of the RFV The tire / rim assembly according to any one of claims 1 to 4, wherein a protrusion amount of a protrusion close to at least one portion pointing to the bottom position is adjusted to be relatively small or zero. RRO
And / or RFV reduction method. 6. The tire according to claim 1, wherein a volatile lubricant or a lubricant that solidifies later is applied to at least one of the bead portion and the rim, and the tire is mounted on the rim. 2. The method for reducing RRO and / or RFV of a tire / rim assembly according to claim 1. 7. A tire and a rim are selected such that a bead tightening force when the tire is mounted on the rim is 2 kN or more, and the selected tire is mounted on the rim. The method for reducing RRO and / or RFV of a tire / rim assembly according to any one of claims 1 to 6. 8. The method according to claim 1, wherein a filler is injected into a gap between the rim and the tire of the tire / rim assembly with reduced RRO and / or RFV. RRO and / or RF of the described tire / rim assembly
V reduction method. 9. RRO and / or RFV are measured at two speeds, low speed and high speed, and a primary component waveform of RRO, an N-order component waveform of RRO, RFV
A correction weight is given to a tread portion corresponding to a portion that changes in the negative direction at high speed in at least one of the primary component waveform and the NV component waveform of RFV, and the primary component of RRO, 9. The method according to claim 1, wherein deterioration of characteristics associated with an increase in speed of at least one of an N-order component, a first-order component of RFV, and an N-order component of RFV is suppressed. 10. RRO and / or RFV reduction method for a tire / rim assembly. 10. RRO and / or RFV is measured at two speeds, low speed and high speed, and a primary component waveform of RRO, an N-order component waveform of RRO, RFV
The tread portion corresponding to the portion that changes in the plus direction at high speed in at least one of the first-order component waveform of the RF and the N-order component waveform of the RFV is partially cut, and the first-order component of the RRO, the N-th order of the RRO Component, the primary component of RFV, and RF
The RRO of the tire / rim assembly according to any one of claims 1 to 9, wherein deterioration of characteristics due to an increase in speed of at least one of the N-order components of V is suppressed.
And / or RFV reduction method.