Tire mounting and demounting machine, tire mounting method and tire demounting method

Abstract

A tire mounting and demounting machine includes a turntable that holds a lower rim portion of a wheel in a detachable state and rotating the wheel about a vertical rotation axial line, a bead guiding member that guides lower and upper bead portions of a tire to fit the lower or upper bead portion to an upper rim portion of the wheel and guides the upper bead portion of the tire, which is fitted to the upper rim portion of the wheel, to be demounted from the upper rim portion, and a bead roller having a pressing surface extending in a direction going away from the rotation axial line, that presses the upper bead portion of the tire mounted on the wheel from above by the pressing surface at a location on a downstream side from the bead guiding member in a rotating direction of the turntable.

Description

technical field [0001] The present invention relates to a tire loading and unloading device capable of detaching a tire from a wheel and mounting the tire on the wheel, a tire mounting method and a tire detaching method. Background technique [0002] A typical prior art is described in, for example, Japanese Patent Application Laid-Open No. 6-255328. In this prior art, since it is difficult to remove and install a high-rigidity tire called a flat tire from a wheel by manpower, a tire loading and unloading device called a tire changer or a tire changer is used. Such a tire loading and unloading device is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-255328. [0003] In this prior art, when the tire is removed from the rim, the pressing arm is lowered to rotate the turntable, and the upper bead and sidewall of the tire are pushed down by the bead rollers to rotate the turntable. At the same time, make the above-mentioned upper bead fall into the conc...

AI Technical Summary

Problems solved by technology

However, in the case of tires reinforced with metal steel wire or carbon fiber in recent years, the rigidity of the tire is further improved compared with the above-mentioned flat tires. Even if the upper bead part is pushed down by the press-fitting roller, insert the protrusion of the bracket head between the upper bead part and the upper bead part of the wheel, and operate the upper bead part and the upper bead part by hand. A crowbar for removing and installing tires is inserted between the rim parts. In order to separate the upper bead part upward from the upper rim part, the protrusion of the above-mentioned bracket head and the crowbar for removing and installing the tire must act strongly on the upper bead part. force, thus damaging the upper bead portion of the tire

In addition, when the tire is mounted on the wheel, the bead roller will press the upper bead portion of the tire with a large pressing force, so the tire may be damaged due to the slippage with the bead roller.

[0010] In this way, if the upper bead portion is damaged, the adhesion between the upper bead portion and the upper bead portion will decrease when the tire is mounted on a wheel, making it difficult to maintain an appropriate air pressure for a long period of time.

[0011] In addition, when the above-mentioned ultra-rigid tire reinforced with steel wire or carbon fiber is pressed by bead rollers on the downstream side of the frame head in the rotation direction and in the vicinity of the frame head, from the upper bead portion of the tire to the The sidewall and shoulder are greatly deformed and sag into a roughly U-shaped or roughly V-shaped, and there is the problem of the above-mentioned steel wire and carbon fiber breaking

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