Pneumatic tire preform building process involves winding or laying rubber plies onto core, pressing the inner and carcass layers into central groove around core by winding on reinforcing wires or cords

摘要

The tire tread strip is divided by a deep central groove(4) below which are reinforcing cords or wires(5) of steel or aramid fibers. Tire components are built up on a segmented core by winding or laying on of rubber compound strips and cords or wires. After laying or winding on an inner layer(11) and a carcass layer(10) a wire or cord is spirally wound in the central groove to form the central reinforcement which presses the inner and carcass layers into the groove. Segments of the vulcanizing tool are pressed against the preform from outside, the tire is vulcanized and the core removed. Reinforcing wires or cords(5) are pretensioned. The circumferential groove in the core can be central or offset from the center. An independent claim is included for the process equipment which includes: a) a segmented core with an outer profile corresponding to the inner profile of a tire and having at least one circumferential groove with constant cross-section into which wires or cords are wound; b) outer vulcanizing tool segments.