Green tire building device and green tire building method using the same

Abstract

The invention provides a raw tire forming device and a raw tire forming method using the device. The device comprises a return unit which comprises a sliding body which is located on an axial direction outside of a tire bead locking unit and capable of supporting on a movable base inside and outside moving to the axial direction; an expandable rubber pneumatic bag located between a tire bead locking ring and a tire body and extending to the axial direction; and a lift arm set contained in the rubber pneumatic bag and formed by a plurality of lift arms. The rubber pneumatic bag expands by inner pressure filling and starts to make the tire body extending part return. The lift arm moves through the movement of the sliding body to the axial direction and locates the tire body extending part which has started returning on an external surface of a radius direction of the tire body through the pressure of the rubber pneumatic bag. According to the invention, scratching and draping to the tire can be restrained and the tire body extending part can effectively round about the tire read and tightly compress and adheres to the tire body.

Description

technical field [0001] The present invention relates to a green tire building device and a green tire building method using the green tire building device, which can make tires in a cylindrical tire carcass (Japanese: タイヤケース) protrude from the bead core to the outside in the axial direction. The protruding carcass protruding part is effectively turned back around the bead core, and is pressed and attached to the cylindrical carcass main part between the bead cores, so that the productivity of the green tire can be improved. Background technique [0002] For example, radial tires for passenger cars often use the so-called TOS (Tread Over Sidewall) structure as follows: Figure 7 As shown, a tread rubber t is superimposed on the radially outer end portion be of the outer sidewall rubber b disposed on the carcass (Japanese: カーカス) a, and the outer end portion be is covered with the tread rubber t. [0003] Such as Figure 8 As shown in (A) and (B), in the green tire building pr...

AI Technical Summary

Problems solved by technology

However, in this mechanical method, scratches and wrinkles are likely to occur on the sidewall rubber because the pressing roller strongly rubs against the carcass protruding part at the initial stage of turning back.

In particular, when the sidewall rubber is formed by a winding body of a so-called rubber belt winding method in which a thin rubber belt is wound in a spiral shape, scratches and wrinkles are conspicuous, and the rubber belt is difficult to handle due to disorder in the winding of the rubber belt.

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