JP3688766B2 - Internal pressure filling method for tire rim assembly - Google Patents

Description

【００１５】
表１より、本発明のリム組法による車輪は、通常のリム組法による車輪に対して平均的に良好なＬＦＶ特性を示していることがわかる。一方荷重負荷方向力の変動値ＲＦＶについては、いずれのリム組法による車輪についても大差なく、実用上問題ないレベルであった。
【００１６】
【発明の効果】
以上に述べたところから明らかなように、本発明によるタイヤのタイヤのリム組み内圧充填方法よるとＬＦＶを低下させ、直進安定性に優れた車輪を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施例を示す図である。
【図２】本発明の他の実施例を示す図である。
【図３】タイヤのリム組み時のビードとリムの嵌着状況を示した図である。
【図４】タイヤの一方側に隙間ができた状態でのタイヤサイドのたわみ量の違いを示した図である
【図５】空気充填時のビード部の動きを示す図である。
【符号の説明】
Ｓ 挿入治具
１ 挿入部
２ 把手部
Ｔ ビード押え器
３ ビード押え部
４ アーム
５ トラバーサ
６ 隙間[0001]
[Technical field to which the invention belongs]
The present invention provides a wheel having excellent straight-running stability by effectively suppressing wheel uniformity, specifically, lateral force variation (hereinafter, abbreviated as LFV due to fluctuations in the force in the tire axial direction) of a tire / wheel assembly. The present invention relates to a method for assembling a tire rim.
[0002]
[Prior art]
When assembling a tire on a rim, the following procedure is usually followed.
First, the entire circumference of the bead on the lower surface of the tire is dropped into the inner side in the width direction of the rim using an instrument such as a lever, and then the bead on the upper surface is dropped into the inner side in the width direction of the entire circumference of the rim. In this state, after injecting air from the in-air injection valve of the rim and fitting the bead to the rim flange, the tire rim assembling operation is completed by adjusting to a predetermined air pressure.
[0003]
[Problems to be Solved by the Invention]
In the conventional tire rim assembling method, the bead and the rim flange are often fitted as follows due to the movement of the tire bead portion during the air filling.
(1) When the air filling is started from the state where the bead portions on the upper surface and the lower surface of the tire are not in contact with the rim flange over the entire circumference, the entire circumference of the bead on either the upper surface or the lower surface as the air pressure inside the tire increases. At one point (partial region), contact with the rim flange is started.
(2) The contact area between the bead portion and the rim flange expands in the circumferential direction as the air pressure increases. In the first place, the bead part is responsible for sealing the internal pressure and transmitting the force generated on the road surface to the rim, so that the bead inner diameter is larger than the rim bead seat outer diameter so that the bead can be firmly crimped to the rim bead sheet. Is also made small. Since the bead seat portion of the rim is inclined so that the outer diameter of the bead seat increases toward the outer side in the tire width direction, the bead portion that first contacts the rim flange is strongly pressed against the rim flange, but later The contact area is no longer strongly pressed against the rim flange, and as a result, the bead surface is fixed while being tilted with respect to the rim flange surface.
(3) On the other hand, the bead portion of the tire surface on the opposite side also comes into contact with the rim flange as the internal pressure rises. The tire bead portion of this surface is the bead portion of the surface that has started contact first. Since the tire tread is coupled with the tire tread, the contact is first attempted to be fitted from a region that is substantially symmetrical via the tire center point with the first contact portion of the opposite surface. FIG. 5 shows the movement of the bead portion during the air filling.
(4) As a result of such movement of the bead portion during air filling, in the tire in which the tire rim assembly work has been completed, the distribution of the bead and rim fitting state on the upper and lower surfaces of the tire is as shown in FIG. In many cases, it is almost symmetrical about the tire center point.
[0004]
Now, when the distribution of the bead and rim fitting situation on the upper and lower surfaces of the tire is applied to the wheels different in the circumferential direction and the axial direction as shown in FIG. Even in a state of being kept perpendicular to the tire, at a certain rotation angle, as shown in FIG. 4, the tire side deflection amount greatly differs in the tire circumferential direction and the axial direction, and the wheel uniformity, particularly the LFV Since this increases periodically and occurs periodically with rotation, the straight-line stability deteriorates.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a tire rim assembly internal pressure filling method that eliminates the problems of the prior art as described above, reduces the LFV of the tire / wheel assembly, and has excellent straight running stability. is there.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention, when the tire is mounted on the wheel and filled with the internal pressure, after mounting the tire on the rim,
(1) inserting at least a pair of insertion jigs at substantially the same position between the bead portion of the tire and the rim flange portion of the wheel across the tire equatorial plane;
(2) filling the internal pressure and fitting a bead part other than the insertion jig part to the rim; (3) detaching the insertion jig;
Consists of.
[0007]
Furthermore, in the present invention, as another method, when the tire is assembled on the wheel and the inner pressure is filled, the tire is attached to the rim,
(1) a step of pressing at least a pair of substantially identical bead portions of the tire across the tire equatorial plane by a bead pressing portion that is operated by a pressing mechanism;
(2) A step of filling an inner pressure with a bead portion of a portion not pressed by the presser portion to the rim;
(3) releasing the presser part from the bead part;
Consists of.
According to the tire rim assembly internal pressure filling method of the present invention, the insertion jig is inserted between the tire bead portion and the rim flange over the same region on the circumference of the upper surface and the lower surface with the tire equatorial plane sandwiched in advance. Since the air filling is performed in a state of being separated from each other, the tire bead portion and the rim flange are securely fitted to both the upper surface and the lower surface of the tire in a region other than this region. In this case, the filling internal pressure may be an internal pressure of about 0.2 kgf / cm ² which is considerably lower than the predetermined internal pressure, but may be appropriately adjusted depending on the state of fitting the tire to the rim.
After that, by removing the insertion jig, this distribution state is released and the remaining tire bead portion and the rim flange are fitted, so that the distribution of the bead and rim fitting situation on the upper and lower surfaces of the tire can be made the same. it can. Since the distribution of the bead and rim fitting situation on the upper and lower surfaces of the tire can be effectively suppressed from becoming non-uniform on both sides and the circumference of the tire as shown in FIG. 3, the uniformity of the wheel, particularly the LFV Does not grow.
[0008]
Also, by simultaneously pressing the tire bead portion inward in the tire width direction by a bead pressing portion such as a traverser over the same region on the circumference of the tire upper surface and lower surface, the bead portion and rim flange other than this region can be By fitting and then weakening the pressing of the bead portion, the contact between the pressed portion of the bead portion and the rim flange can be delayed and fitted.
Any method using a jig can easily provide a wheel in which LFV is effectively suppressed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a place where an internal pressure filling jig is inserted between a tire bead portion and a rim flange. The jig is composed of the insertion part 1 and the handle part 2, and the use of hard plastic such as ABS resin is appropriate for the material, but it is worn and deformed by metals such as aluminum and stainless steel, wood, etc. If durability, such as this, is acquired, it will not specifically limit.
[0010]
Although the tire circumferential direction width of the insertion portion 1 is not particularly clearly defined from its action, it is preferably about 10 to 30 cm from the viewpoint of ease of use. In addition to the ring shape shown in FIG. 1, the handle portion 2 can be a rod-like grip, or can be provided at the apex position where a pair of upper and lower insertion portions are connected.
[0011]
FIG. 2 shows that the bead presser is applied to a tire rim assembly machine. Here, the bead presser comprises a push-in portion 3, an upper and lower arm 4, and a traverser 5, and the use of a metal such as stainless steel or general steel is appropriate. The upper and lower arms 4 can be moved up and down according to the axial width of the target tire by a 5-traverser made of screws or the like, and the pushing portion 3 can also be moved up and down relative to the upper and lower arms 4. It is like that. The structure of these pressing mechanisms may be a spring system, a system using an electric motor, or the like in addition to the screw system shown in FIG. Further, a simple structure in which the pushing portion 3 and the upper and lower arms 4 are integrally formed and the sliding portion is only the traverser 5 can be adopted. Here, the traverser 5 is fixed in parallel with the tire axial direction of the tire rim assembling machine, the pushing portion 3 is applied to the tire bead portion close to the rim flange, and one of the sliding portions is moved to move both the upper and lower tire bead portions to the rim flange. They are isolated from the air and faced with air filling.
[0012]
In order to confirm the effect of the tire in the present invention, a radial tire for a passenger car of 195 / 65R14 size was used, and a wheel assembled on a rim of 6JJ-14 by a normal method and a wheel assembled by a rim by the method of the present invention were used. 10 sets are prepared, adjusted to an internal pressure of 2.0 kgf / cm ² , attached to a drum type tire testing machine with a diameter of 2 m, with a speed of 10 km / h and a load of 400 kgf applied, when driving straight and rotating one wheel The fluctuation value (LFV) of the tire axial force generated in the tire was measured.
[0013]
Table 1 shows the average value of the LFV of the wheel assembled by each method and the average value of the LFV of the wheel by the normal rim assembly method.
[0014]
[Table 1]

[0015]
From Table 1, it can be seen that the wheel by the rim assembly method of the present invention shows an average better LFV characteristic than the wheel by the normal rim assembly method. On the other hand, the fluctuation value RFV of the load-load direction force was a level that was not problematic in practical use because there was no great difference in any of the rim assembly wheels.
[0016]
【The invention's effect】
As is apparent from the above description, according to the tire rim assembly internal pressure filling method of the tire according to the present invention, it is possible to provide a wheel with low LFV and excellent straight running stability.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is a diagram showing another embodiment of the present invention.
FIG. 3 is a view showing a bead and rim fitting state when a tire rim is assembled.
FIG. 4 is a diagram showing a difference in deflection amount on a tire side in a state where a gap is formed on one side of the tire. FIG. 5 is a diagram showing a movement of a bead portion during air filling.
[Explanation of symbols]
S Insertion jig 1 Insertion part 2 Handle part T Bead presser 3 Bead presser part 4 Arm 5 Traverser 6 Clearance

Claims (2)

When filling the tire with the rim and filling the inner pressure, after attaching the tire to the rim,
(1) inserting at least a pair of insertion jigs at substantially the same position between the bead portion of the tire and the rim flange portion of the wheel across the tire equatorial plane;
(2) filling the internal pressure and fitting a bead part other than the insertion jig part to the rim; (3) detaching the insertion jig;
A tire rim assembly internal pressure filling method comprising: When filling the tire with the rim and filling the inner pressure, after attaching the tire to the rim,
(1) a step of pressing at least a pair of substantially identical bead portions of the tire across the tire equatorial plane by a bead pressing portion that is operated by a pressing mechanism;
(2) A step of filling an inner pressure with a bead portion of a portion not pressed by the presser portion to the rim;
(3) releasing the presser part from the bead part;
A tire rim assembly internal pressure filling method comprising:

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