JPS6042107A - Tire bead - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforcing structure for tire beads. Tire beads are reinforced by non-stretchable hoops or bead cores, which are usually formed from twisted steel wire. A tire carcass reinforcing braai is wrapped or folded around this bead core to provide a fixed anchorage to the carcass.

Additional rubber and textile components are used within the bead to strengthen and stiffen the bead area.

Especially for tires that are made to withstand heavy use.
It has become common to provide filler and/or chafer strips extending around the bead area.

These components have traditionally been formed from fabric with cut edges, usually cut so that the reinforcing members are placed at a bias angle, so that the fabric edges that are radially outward of the beat core are located within the cord. Loose edges cause tire damage. This loose edge is due to both loosening of the filament or strand and lack of adhesion to the rubber, usually due to lack of brass plating at the cut end.9
This can cause structural damage when using tires.

It is an object of the present invention to provide a tire bead having a fillet (1) l) which can be used radially inwardly or outwardly of a carcass ply and eliminates the above-mentioned problems.

According to the present invention, there is provided a tire bead which has a reinforcing structure and includes an annular bead core, an apex strip extending radially outward from the bead core, and a filler strip. The filler strip here includes a piece of fabric formed by a single continuous reinforcing member that extends continuously back and forth from side to side of the piece of fabric, thereby The filler strip reinforcement piece does not have cut ends on both sides thereof.

The reinforcing piece can include twisted tire cord of fabric or steel. The reinforcing member may also include a narrow bunt of small amounts of parallel reinforcing cords. The bunt extends continuously back and forth from side to side of the fabric piece.

Preferably, the reinforcing piece lies in a single plane and the filler strip has approximately the same thickness at all points across its width, this thickness being approximately equal to the diameter of the reinforcing element. In this way, the reinforcing member extends in a zigzag shape at the tube.

Preferably, the cords are provided with each transverse axis close to the previous transverse axis. The cords can be made to substantially touch each other or they can be spaced between 02 and 20 times the diameter of the cords.

At the edge of the strip the cord is 1 around the vertical axis.
The cord filaments, which are bent over 80[deg.], which is advantageously done with a small radius, are moved and aligned so that each has the same bending radius. The zigzag assembly of cords is locked in place by a note of elastomeric material that is pressed onto one side of the assembled cord.

The reinforcing element can be present in two dimensions, and the filler strip has approximately twice the thickness of the reinforcing element. This configuration is of a flat tubular wrap where the cord resides at the top of the ear. Sorts of elastomer can be placed in place within the turns to lock the cord in place within the flat strip.

In all cases the filler strip has no weft threads and no cut edges. The reinforcing member is provided at a right or bias angle to the length of the strip.

The filler strip is provided in the tire bead in its normal location, either inwardly or outwardly above the center of the bead core, with one edge radially outwardly of the bead wire and the other edge near the bead core or at another location. will be placed in For example, both edges can be placed radially outward from the center of the bead core and the tire wrapped near the underside of the bead.

Additionally, the filler strip is folded back on itself near one edge to provide additional rigidity in this area and this folding is repeated without creating a row of cut cord ends anywhere on the filler strip.

The tire bead of FIG. 1 includes an annular bead core 1 formed by closely wound steel wire and a main carcass fly 2 made of steel cord tire carcass fabric. The carcass ply 2 is wound around the bead core located axially inwardly of the bead core 1 and forms a short turn-up which terminates in a conventional cutting edge 4.

A hard rubber apex strip 5 is provided on the bead core to provide ply support for the bead core wrap.

The bead is further stiffened by a tire strip 6 which extends from a point 7 near the axially outer edge of the bead core to a second point 8 radially outwardly from the cutting edge 4. It's distracting.

The tire strip thus stiffens the bead, overlaps the cutting edge and provides improved seating of the tire bead on the wheel rim bead and flange during use.

The tire bead of FIG. 2 is essentially the same as that of the embodiment of FIG. 1, except that the filler strip 6 is wider and wrapped at point 9. The winding part is fissured.
Defining the radially outermost part of the strip, the cutting edge 4 is adapted to overlap the tire strip. The wrapped region 10 is located axially outwardly from the main portion of the fish strip as shown.

The two filler strip examples described above are merely two of the various shapes of cut edge filler strip fabrics known in the art, and the new filler strip paulownia material of the present invention is a composite strip array. and other configurations including strips axially inward of the bead core.

The new filler strip materials are shown in Figures 6 onwards and have two basic configurations. First, in the embodiment shown in FIGS. 6 and 4, it is formed from a single steel tire cord 11 formed from twisted steel filaments in the conventional manner and arranged in a zigzag configuration. The cord 11 is a) l) arranged at a bias angle across the width of the tube and the first edge 1
2 is folded 1800 degrees around a vertical axis 1 passing through the plane of the strip. The cord 11 then traverses the string parallel to the previous section to the other edge 14. The spacing between the previous part should normally be 0.1 to 20 times the coat diameter. At the other edge the cord is again folded over 18D0 around the second vertical axis. This zigzag arrangement of cords is embedded in VC in an unvulcanized rubber compound to provide an easy-to-handle filler strip material for use in tire beads as described above.

The filament thus obtained) l) The tube material has looped edges so that there are no cut cord ends which could cause problems in the finished tire due to abrasion and the filament as shown in Figure 4. The strip material has one cord diameter plus a small amount of finished rubber compound. It will be appreciated that when the filler strip is assembled into a tire, the spacing between the cords increases in the radially outward portions of the strips, but the successive transverse axes of the cords become closer together.

Another configuration of filler strip fabric is shown in Figures 5 and 6, where it is wound into a single steel tire cord or flattened tube configuration. One transverse axis 16 thus crosses the top of the fabric.
5, the code shown in solid line in FIG.
In 7, the cord is placed at a slightly larger bias angle C than B. Therefore, the cross section of the strip is thicker than the thickness of the diameter of two cords (and the edge loops are thin).It is curved 1800 degrees around the axis in the plane of the IJ tube. A central core 1B of unvulcanized rubber can be provided, or alternatively the strip can be further flattened so that the coats are approximately together.

A single cord is wound (alternatively, the filler strip can be made from a narrow strip containing multiple cords in parallel and embedded in the rubber compound. This strip is then wound in the second configuration described above). is wound in the same way as a single cord.

The cord can be made of steel or fabric depending on the application (passenger car, truck, civil engineering vehicle, etc.), and can have an appropriate coat construction. A single continuous filament material can also be used. In all cases, an important advantage of the filler strip of the present invention is the absence of cut ends for the cord or filament, which prevents separation of coated filaments and erosive wear problems. The looped edges at the edges of the fin strips reduce stress concentrations in the rubber and reinforce the cord beats at the ends of the cut cord. Additionally, the air trapped within the coat remains in the continuous coat and is not forced out of the cut coat edges during tire vulcanization, thus preventing air bubbles from forming in the upper bead area.

The transverse axis of each of the reinforcing members is generally straight between the edges so that the reinforcing material is used efficiently. 1 more
In the edge loop formed by the 80° bend, the cord can be made into a modest shape. That is, the filament or strand leaves its normal cord position and reaches a position around the bending axis with the same bending radius.

This makes the filament or strand sharp 1
This prevents overstressing in the 800 bend and thus prevents the filament or strand from breaking when the filler strip is deflected in use.

It will be appreciated that filler strips can be used in tire formation by conventional means using conventional butt joints.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a bead of a radial ply truck tire, Fig. 2 is a sectional view of another example of a bead similar to Fig. 1,
6 is a plan view of a piece of filler strip, FIG. 4 is a sectional view taken along line IV--IV in FIG. 6, FIG. 5 is a plan view showing a second type of filler strip, and FIG. ■ in Figure 5
It is a sectional view along the -v line. 1: Bead core 2: Carcass bridle 4: Cutting edge 6: Filler strip 11: Codes A, B, C: Bias angle % Applicant Absley Metals Ltd.
11J,':) L, 13 15-XA -=- 1 FIG, 4 FIG, 6

Claims (1)

[Claims] (])! A tire bead having a reinforcing structure consisting of an i-shaped bead core, an apex strip extending radially outward from the bead core, and a filler strip, wherein the filler strip (6) is a continuous single reinforcing part. comprising a piece of fabric formed by sides (11), which piece of fabric extends continuously back and forth from side to side, said filler strip reinforcing member having looped edges; A tire bead characterized in that it has no cut ends on both sides. (2. The tire bead according to claim 1, wherein the reinforcing member (11) is in a single plane and the filler strip (6) is substantially identical at all points across its width. The reinforcing member (11) has a thickness of
A tire bead characterized by being arranged in a zigzag shape. (3) The tire beat odor according to claim 2 is such that the cord (11) extending across the strip on a continuous transverse axis has a cord diameter of 01 to 2 before assembly into the tire. A tire bead characterized in that the beads are arranged at intervals of .0 times. (4) In the tire bead according to claims 1 to 3, the cord (11) is formed on one side of the assembled cord (1) by a diagonal sheet on the elastomer side that is pressed. A tire bead, characterized in that it is moored in place in a filler strip. (5) A tire bead according to claim 1, in which the reinforcing member (11) is located in two planes and the reinforcing member (11) is located in two planes. A tire bead according to claim 5, characterized in that the member is in the form of a flattened tube wound with a single cord having loops at the fissures or strip edges. A tire bead characterized in that the wound cord is moored in place by a shea If of elastomeric material mounted within the winding and in which the winding is flattened. (7) Claim 1 In the tire bead according to any one of items 6 to 6, the filler strip (6
) is assembled into the bead and is wound longitudinally near one edge before being knitted, and is provided within the bead so that the wound edge is located radially outward from the heat core. bead.