JPH02120101A - Attaching method for tire to wheel - Google Patents

Abstract

PURPOSE:To enable the accurate attachment of tires by injecting the predetermined air to tires temporarily attached to the wheels, and thereafter, performing the predetermined operation for regulating the offset of the attached condition of the tires, and further injecting the air to the tires. CONSTITUTION:A wheel 4 is engaged to a positioning member 22 of an elevatable cradle 20, and a tire 2 is set to its upper side, and thereafter, the cradle 20 is raised so that a centering rod 24 abuts to a central hole 4a of the wheel 4. Next, the predetermined air is injected into the tire 2 from an air injection head 26, and this injection is performed through the space formed between the upper side bead part 2a of the tire 2 and a rim part 4b of the wheel 4. Next, the lower side bead part 2b of the tire 2 is pressed by piston rods 28a of multiple bead part pressing cylinders 28 so that the lower side bead part 2b is engaged in the normal position by the elasticity of the tire 2. Thereafter, the predetermined quantity of the air is further injected into the tire 2 so as to complete the assembly operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for assembling a tire onto a wheel, which assembles the tire at a predetermined position on the wheel.

(Prior art) Tires are generally installed on wheels by injecting air into the tires after installing the tires on the outer periphery of the wheels, but in the case of tubeless tires, for example, As disclosed in Japanese Patent No. 58-83506, it is possible to adopt a method in which a gap is formed between the tire and the wheel by pressing the bead of the tire, and air is injected into the tire through this gap. This allows efficient tire assembly.

(Problem to be Solved by the Invention) However, even if air is injected all at once into a tire mounted on the outer periphery of a wheel, it is normal for the tire to be mounted unevenly on the wheel.
The positional relationship between the wheel and tire is not accurate in the final assembled state, and therefore, when using a wheel with tires assembled in this way, unevenness on the tire circumference may occur. This results in inconveniences such as vibration of the vehicle body (due to an increase in RFV, for example).

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for assembling a tire to a wheel, which allows the tire to be accurately assembled to a predetermined position on the wheel. be.

(Means for Solving the Problems) The method of assembling a tire onto a wheel according to the present invention does not involve injecting air into the tire mounted on the outer periphery of the wheel all at once, but by injecting a predetermined amount of air once. After that, perform the specified operation to correct the unevenness of the tire installation condition.
The above objective is achieved by further injecting air thereafter. That is, after the tire is mounted on the outer circumference of the wheel, a predetermined amount of air is injected into the tire, then the bead on one side of the tire is pressed toward the bead on the opposite side of the tire, and this pressure is released. After that, the opposite bead portion is pressed toward the one side bead portion to form a gap between the wheel and the tire, and a predetermined amount of air is further injected into the tire from the gap. This is a characteristic feature.

(Function) As shown in the above configuration, after a predetermined amount of air is injected into the tire mounted on the outer periphery of the wheel, pressure is applied to the bead on one side of the tire. Even if the bead on one side of the tire and the wheel are not properly fitted after injection, the pressure described above allows the bead on one side and the wheel to fit in the correct positional relationship due to the elastic action of the tire. be able to.

However, at this point, the bead on the opposite side of the tire and the wheel are not yet properly fitted, but after the above pressure is released, when inflating the tire to the specified pressure, Since the bead portion on the opposite side is pressed, this pressing allows the opposite bead portion and the wheel to be fitted in the correct positional relationship by the elastic action of the tire.

(Effects of the Invention) Therefore, according to the present invention, the tire can be accurately assembled to the wheel at a predetermined position, thereby eliminating inconveniences such as vehicle body vibration caused by non-uniformity on the tire circumference. can do.

(Examples) Examples of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 5 are process explanatory side views showing an embodiment of the method for assembling a tire to a wheel according to the present invention, in which FIG. 1 shows the tire mounting process, and FIGS. 2 to 5 indicates the air injection process.

As shown in FIG. 1, the tire 2 is attached to the outer periphery of the wheel 4 by fitting the wheel 4 into the positioning member IO of the pedestal 8 that is movably supported on the fixed base 6.
After setting the tire 2 diagonally on the upper side, the pedestal 8 is raised to bring the centering rod 12 hanging from above into contact with the center hole 4a of the wheel 4, and then the tire supported by the centering rod 12 is This is done by rotating the expansion roller 14 and bead drop roller 16 around the centering rod 12 and fitting the tire 2 onto the outer periphery of the wheel 4.

The configuration of a tire mounting machine for mounting tires in this manner is well known (for example, Japanese Patent Application Laid-open No. 88802/1982), and therefore a detailed explanation thereof will be omitted.

The tire 2 mounted on the outer periphery of the wheel 4 in this way is normally mounted in a biased state with respect to the wheel 4, so even if air is injected all at once, the wheel 4 and tire 2 are Assembling will be performed with the positional relationship of the parts shifted. Therefore, in this embodiment, air is injected into the tire 2 according to the following procedure.

That is, as shown in FIG. 2, first, the wheel 4 is fitted into the positioning member 22 of the pedestal 20 that is movably supported by the fixed pedestal 18, and then the pedestal 20 is raised to position the center of the wheel 4. A centering frame 24 hanging down from above is brought into contact with the hole 4a, and then a predetermined amount of air is injected into the tire 2 by the air injection head 26. The air injection head 26 includes double annular protrusions 26a and 26b, and after the centering frame 24 contacts the center hole 4a of the wheel 4, the inner annular protrusion 26a contacts the rim portion 4b of the wheel 4. At the same time, the outer annular protrusion 28b contacts the upper bead portion 2a (opposite bead portion) of the tire 2 and directs it downward (that is, toward the lower bead portion 2b (one side bead portion)). ) to press. Due to this pressing action, a gap is formed between the upper bead part 2a of the tire 2 and the rim part 4b of the wheel 4, and the air passage 26c having a plurality of injection ports is passed between the annular projections 26a and 26b through the gap. A predetermined amount of air is injected into the tire 2.

Note that the configuration of the air injection machine for performing such air injection is such that the bead portion pressing cylinder 28, which will be described later, is attached to the fixed base 18.
Since it is well known except that it is attached at a predetermined position (for example, Japanese Utility Model Application Publication No. 58-83508), a detailed explanation thereof will be omitted.

By performing the above air injection, it is considered that the assembly of the tire 2 to the wheel 4 has been completed, but as shown in FIG. The fitting state with the rim part 4b is not complete (in the figure, the lower bead part 2b located on the left side of the wheel 4 is inserted too far into the rim part 4b, and the lower bead part 2b is located on the right side of the wheel 4). The lower bead portion 2b is less crowded than the rim portion 4b).

Therefore, as shown in FIG. 3, the piston rods 28a of the plurality of bead pressing cylinders 28 are brought into contact with the lower bead 2b of the inflated tire 2 from below. 2b is pressed upward (that is, toward the upper bead portion 2a) (indicated by a dashed line in the figure), and then this pressing is released. Thereby, the lower bead portion 2b, which has been fitted in the wrong position with respect to the rim portion 4b, can be fitted in the correct position due to the elasticity of the tire 2.

After fitting the lower bead portion 2b of the tire 2 and the rim portion 4b of the wheel 4 in the correct positional relationship in this way, the fourth
As shown in the figure, a predetermined amount of air is further injected into the tire 2 through the gap formed between the upper bead portion 2a of the tire 2 and the rim portion 4b of the wheel 4, and the air pressure within the tire 2 is maintained at a predetermined level. Set pressure.

Thereafter, as shown in FIG. 5, when the pedestal 20 is lowered, the upper bead portion 2a of the tire 2
The pressure by the annular protrusion 2 [fb is released and the tire 2 is fitted into the rim portion 4b of the wheel 4 in the correct positional relationship, thereby completing the assembly of the tire 2 onto the wheel 4.

As described in detail above, according to this embodiment, the tire 2 can be accurately assembled to the wheel 4 at a predetermined position. Therefore, the tire-equipped wheel assembled in this manner has extremely small non-uniformity on the tire circumference, and it is possible to eliminate inconveniences such as vehicle body vibration caused by this.

In this example, the second air injection (the fourth
The pressing operation on the upper bead portion 2a in FIG.
The explanation has been made assuming that the pressing operation is continued from the first air injection (FIG. 2), but after the first air injection, the air jet head 26 is raised and the air jet head 26 is pressed against the upper bead portion 2a. It goes without saying that the pressure may be applied again after the pressure is released, and the first air injection does not necessarily have to be performed using the air injection head 26.

[Brief explanation of the drawing]

1 to 5 are process explanatory side views showing an embodiment of the method for assembling a tire to a wheel according to the present invention, in which FIG. 1 shows the tire mounting process, and FIGS. 2 to 5 indicates the air injection process. 2... Tire 2a... Upper bead part (opposite bead part) 2b...
Lower bead part (one side bead part) 4...Wheel
4b...Rim part 26...Air injection head 28...Bead part pressing cylinder

Claims (1)

[Scope of Claims] After mounting the tire on the outer periphery of the wheel, a predetermined amount of air is injected into the tire, and then a bead portion on one side of the tire is pressed toward a bead portion on the opposite side of the tire, After releasing this pressure, the opposite bead portion is pressed toward the one side bead portion to form a gap between the wheel and the tire, and a predetermined amount of air is further introduced into the tire from the gap. A method for assembling a tire onto a wheel, which is characterized by injection.