Abstract:
Reinforcing rubber which constitutes a reinforcing rubber layer in a pneumatic tire 10 is formed by winding a plurality of beltlike reinforcing rubber sheets adapted to have almost the same cross-sectional area and cross-sectional shape around a forming drum over its entire periphery while being shifted in the axial direction of the forming drum such that at least portions thereof in the width direction of the tire overlap each other over the whole periphery of the forming drum and by separately jointing both longitudinal ends of the respective reinforcing rubber sheets. As a result, a pneumatic tire with improved run-flat durability without hindering comfortable riding can be formed while hindrances to manufacture are minimized.
Abstract:
An annular side wall rubber is injection molded, a forming mold is mold released while retaining the side wall rubber in an unvulcanized state, and a side surface of the side wall rubber is exposed annularly. Further, a lower mold of the forming mold is moved close to a carcass body in which a center portion is evaginated to an outer side in a diametrical direction, on a forming drum, and the side surface of the side wall rubber is attached to a side portion of the carcass body. Thereafter, the side wall rubber is released from the forming mold by moving the lower mold away from the carcass body.
Abstract:
During manufacture of a tire, a carcass reinforcement ply is wound on a cylindrical laying surface on which have been deposited a pair of profiled elements spaced apart along the cylinder axis. The reinforcement ply is fed onto the laying surface while being pressed thereagainst by an application roller which is deformable so as to conform to both the cylinder diameter and the larger radii defined by the profiled elements. Additional rollers can be positioned upstream of the application roller for pressing the ply against respective ones of the profiled elements. A transporter supports one or both the end portions of the ply as they leave a feeder conveyor and approach the laying surface.
Abstract:
The invention relates to a method for building a tire casing on a tire building drum for a self-supporting radial tire, wherein the tire casing comprises an inner layer, reinforcing profiles for side walls as well as side walls, at least one casing ply and bead areas and wherein the tire building drum is provided with surrounding pockets for receiving the reinforcing profiles, characterized in that the regions of the reinforcing profiles (9) coming into contact with the inner layer (4) are provided with a groove structure, which comprises a plurality of grooves (12) extending in a continuous manner, in particular transverse to the circumferential direction of the tire building drum (10).
Abstract:
Method and apparatus for applying an apex at a workstation of a pneumatic tire building machine wherein a carcass reinforcement ply and one or more bead area components have been built into an in-process carcass on a tire building drum of the tire building machine. An injector-extruder is located at the workstation, and is either configured to extrude hot apex material directly into a bead area of the in-process carcass on the tire building drum, or to extrude the hot apex material onto an application drum followed by applying a hot apex from the application drum into a bead area of the in-process carcass on the tire building drum.
Abstract:
A self-supporting tire for vehicle wheels includes a carcass structure having at least one carcass ply, a belt structure, a tread band, at least one pair of sidewalls, and at least one pair of resilient stiffening inserts incorporated into the carcass structure. The at least one carcass ply includes axially-inner strip lengths and axially-outer strip lengths, and may also include axially-intermediate strip lengths. Each of the strip lengths extend in a U-shaped configuration around a cross-section outline of the carcass structure to define two side portions spaced apart from each other in an axial direction and a crown portion extending at a radially-outer position between the side portions. The resilient stiffening inserts are axially interposed between the side portions of the axially-inner strip lengths and the side portions of the axially-outer strip lengths.
Abstract:
It is to provide a pneumatic safety tire capable of continuing safe running even if an internal tire pressure drops to an atmospheric pressure and easily producing the tire, in which a side reinforcing rubber layer having substantially a crescent form at a section in a widthwise direction is mainly arranged on the sidewall portion and at least one annular depression convexly protruding inward in the radial direction and continuously extending in the circumferential direction is arranged on the belt.
Abstract:
A first stage tire building drum for building a run flat tire has a cylindrical central portion for receiving the strip components thereon for fabricating a first stage body ply carcass and has a pair of bead receiving areas adjacent the central portion for receiving bead rings thereon. The central portion and bead areas preferably are formed by a plurality of moveable arcuate segments. A spacer or sleeve is formed by a plurality of arcuate segments and is mounted on the center of the cylindrical drum portion and forms a pair of adjacent recesses. The spacer has a smooth outer cylindrical surface. The spacer has a height equal to the thickness of run flat tire sidewall inserts and a width equal to the distance between the inside edges of the opposed sidewall inserts. The elastomeric inserts are placed in the recesses adjacent the central spacer, and in combination with smooth outer surface of the spacer, provide a substantially smooth continuous flat surface for receiving the various tire components thereon without interruption.
Abstract:
A band element for mounting in the crown portion of a pneumatic tire to provide run flat ability to the tire in the event of loss of air pressure and to provide increased puncture resistance. The band is formed of flat strips of tape having fibers embedded in a resin matrix which are twisted and then pultrated to provide a rectangular cross sectional configuration. The twisted tape is wrapped about a mandrel and forms either the only layer, or the intermediate layer of a composite band in combination with inner and outer layers of flat tape or wound filament fibers, whereby the fibers in the tape extend across the central axis of the band to reduce interlaminar sheer. In another embodiment, a plurality of dimples or depressions are formed in the individual tape layers to extend a plurality of the fibers across the layer boundaries to reduce interlaminar sheer.
Abstract:
A tire 10 has a composite ply 40. The composite ply 40 has a primary ply 40A reinforced with parallel inextensible cords 41 and a pair of ply extensions 40B having synthetic cords. The method of manufacturing the tire 10 is described. The tire 10 can be made as a runflat type tire.