DE2647644A1 - WHITE WALL TIRE AND METHOD FOR MANUFACTURING IT - Google Patents

Description

Patent attorneys
Dipl.-Ip ». VV. Γ '-: ·: ■ ": ■ ?.'

Case 8041-GE / Hk 19ο 10. 1976

The Goodyear Tire & Rubber Company, Akron, Ohio 44316 UNITED STATES.

Whitewall tire and process for its manufacture

The invention relates to a vehicle tire with a tire in the circumferential direction White decorative stripes running along one side wall, with two integrally formed on this side wall, likewise circumferential in the circumferential direction, the side wall surface protruding and an annular recess between enclosing ribs, and with one of the recess adapted, Strips of white rubber material molded therein and vulcanized in one piece with the tire and having a thickness of at most 2 mm.

The invention also relates to a method for manufacturing a whitewall vehicle tire, one strip being less Thickness of white rubber material circumferentially around the outer surface of the sidewall portion of a tire is placed in its unvulcanized state.

The invention is based on the object of a known To create whitewall tires improved in its decorative properties and to specify a method, according to which such Tires can be manufactured more cheaply.

-Z-709816/0939

264764A

The solution to the problem is given with a tire initially mentioned genus according to the invention seen in the fact that the strip of white rubber material has surrounding edges, which end outside of the strip arranged in the recess and flush with the outwardly directed surfaces of the ribs, and that the surfaces of the sidewall resting against the tire mold are only at the edges of the strip and the surfaces of the Ribs are machined.

The solution of the task serving process for producing a whitewall tire, the invention characterized by inserting the green tire in a tire-vulcanizing mold with the white stripes in the immediate A _n iage to the mold relative to each other by displacing a - viewed in the widthwise - average Part of the thin strip inward and the respective edge areas of the strip outward in directions perpendicular to the outline of the side wall area to form a wall between the middle part and the edge areas, which extends perpendicular to the outline of the side wall area and is circular around it by vulcanizing and then removing the tire from the mold and machining the edge portions of the strip and an outwardly directed portion of each vertical wall of the strip.

The task at hand is thus solved, as the skilled person suggests the following description of a preferred exemplary embodiment recognizes the subject matter of the invention.

09818/0939

- JL-

Pig. Fig. 1 is a partial axial cross-section of a tire according to the invention in almost true scale.

Fig. 2 shows part of Fig. 1 on an enlarged scale.

FIGS. 3 and 4 schematically show process steps in production of a tire as shown in FIG.

A tire designed according to the invention has in its side wall area 12 has two circumferential ribs 14, 16 on the circumference of the tire, which between them delimit an annular recess 2o. In this depression 2o is a strip 25 of a white Rubber compound which covers the surfaces 27, 28, 29 of the recess and is molded therein and vulcanized in one piece with the tire 1o is.

This training offers two notable advantages:

- the white rubber strip is nowhere thicker than 2 mm, thereby reducing the amount of gum compound necessary to make a decorative whiteboard;

the respective ribs 14, 16 and those under the strip Sidewall parts are completely free of anything towards the inside white material, which prevents unwanted spoiling of the tire's appearance due to abrasion on the respective ribs will. The height of the ribs with reference to the white stripe 25 in the Well 2o protects the white surface sufficiently against discoloration or staining.

The white stripe v. Lying in the depression is along the respective Contact surfaces 27, 29 of the adjacent ribs folded outwards so that the edges 31, 32 of the strip are flush with the Outer surfaces 35 »36 of the respective ribs 14 and 16 lie.

3 shows part of the sidewall area 12 'of an unvulcanized tire 1ο ¹ , which lies on a tire building surface 4o, the usual black rubber compound of the side

709816/0939

walled the cord layers of the tire superimposed. By the reference number 10 'the tire in the manufacturing process is finished Tire 10 differentiated, as well as the index line (apostrophe ') Parts of the unvulcanized tire 10 'from equal parts of the vulcanized tire 10 differs. A thin strip 25 "of white rubber compound is arranged on a circumference on the outer surface 42 of the side wall region 12 'and connected in the usual way butting or overlapping to form an endless white band around the unvulcanized tire, the generally cylindrical in shape.

The unvulcanized tire 10 'is then removed from the building surface 40 and placed in a tire vulcanizing mold (not shown), the thin strip 25 ^! made of white rubber compound is in direct contact with the shape "

As shown in FIG. 4, the middle part 50 of the shape has In terms of width - of the strip 25, i. H. the part overlying the bottom 28 of the recess 20 and the respective edge regions 52, 5 ^ relative to one another in directions perpendicular to the outline 56 of the tire sidewall region 12 - relative to its inflated state - relocated. The displacement results in a movement indicated by the arrows 58 of the underlying black sidewall gum mass outwards from the outline 56, around the two ribs 14.16 to form. The movement of the black sidewall rubber mass relative to the white stripe 25, in particular along the walls 27 and 29, not only leads to the formation of the walls 61, 63 of the strip between the central part 50 and the edge areas 52 and 54, but also causes these walls of the Stripes become thinner as the movement progresses. This thinning is achieved by shaping the ribs 14, 16 with inclined surfaces 65 and 66 extending from an apex 68 near the recess 20 down to the sidewall outline 56 are directed, reinforced.

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According to the invention, approximately semicircular in cross section, a radius of approximately 1 mm having stop beads 70 are provided, which prevent the respective edge areas of the white stripe from flowing over them during the molding process The surfaces 65, 66 of the ribs slope from the apex at an angle of 5 ° to 30 °. through this arrangement allows the apex 68 to be formed which has the desired effect of reducing the strength of the respective walls 61, 63 enlarged without increasing the amount of rubber required.

The width of the ribs 14, 16 - measured radially of the tire, allows a considerable tolerance in the width of the white stripe as in its application radially of the tire. V ± _e respective edges of the strip / ns 25 can in this respect also end between the stop bead 70 and approximately the middle of the width of the inclined surface 65 or 66 of the ribs 14 or 16 after the molding process of the tire (FIG. 4).

After it has been molded and vulcanized, de? Tires off Taken from the mold, then assembled and inflated. Then the edge areas 52, 54 of the white stripe and Parts of the ribs 14, 16 removed outside a buffing line 75, this line 75 being within the respective marginal areas of the white stripe and through each of them in between lying parts of the walls runs. This way, every white border area becomes as well as an outward part of each wall 61, 63 removed. The buff line 75 can be generally parallel to the outline 56 of the side wall portion lie. Without a loss in the appearance of the finished tire, the buffing line can be a straight line that can be formed more easily by means of the cylindrical surface of a conventional buffing disk.

. 709816/0939

A number of advantages are achieved by the invention. In particular is through the application of the thin strip of wj | eßem From the material side, rubber only requires a small amount of the relatively expensive white material. Further lies the entire outer surface of the white rubber material free, and no material whatsoever is hidden in the side wall or covered in some other way. Dg-dsrch there is also a danger, that additional white can be accidentally exposed by minor damage to the tire, which in turn. the look its surface is adversely affected.

Since the arrangement of the white stripe can be seen during the entire process and the stripe is not hidden under an overlaying black guiiaiia material ₉ any misalignment of the white stripe is to be determined ₉ and this can be corrected, boTor-ICostsa for the subsequent work processes arise. Buren, the presence of the white rubber mass becomes the structural

unity of the underlying side wall is not affected in any way.

The surface quality of the thin white stripe is given by the direct contact with the tire vulcanizing mold, and with Except for the very thin edges of the strip, which end flush with the finished ribs, the surface becomes not roughened or made porous by buffing.

709816/0939

Claims (5)

Claims C1! Vehicle tires with a circumferential direction on one side V / wall running white decorative stripes, with two in one piece formed on this side wall, rotating also in the circumferential direction matched the ¹ S _e itenwandoberflache superior and a ringfönmige recess therebetween enclosing ribs and with one of the recess formed therein and integrally vulcanized with the tire strip of white rubber material having a thickness of at most 2 mm , characterized in that the strip (25) has circumferential edges (31 »32) which end outside of the strip arranged in the recess (20) and flush with the outwardly directed surfaces (35» 36) of the ribs (14, 16) , and that the surfaces of the side wall (12) resting against the tire mold are only machined to remove the edges (31, 32) and the surfaces (35 »36). 2. Tire according to claim 1, characterized in that the surface of the strip (25) is completely exposed, as well is free of overlying black sidewall rubber material and that the ribs on the sidewall are merely made of black rubber material " 3 · A method of manufacturing a whitewall vehicle tire, wherein a thin strip of white rubber material is arranged in the circumferential direction mn the outer surface of the sidewall region of a tire in its unvulcanized state, characterized by inserting the unvulcanized tire (10 ·) into a tire vulcanizing fora with the white strip (25 ¹⁾ in the immediate ^a nLocated to the mold by moving relative to each other a in the width considered - the central part (50) of the thin strip inwardly and the respective edge regions (52, 54) of the strip away in the contour line ( 56) of the Seitenwandbereiohs perpendicular directions to the training each 709816/0939 ORiGlMAL INSPECTED 26476U a between the central part (50) and the edge regions (52, 54) located wall (61 _t 63) "which extends perpendicular to the contour line (56) of the side wall portion (12) and circular extending around, by vulcanization, and subsequently removing of the Tire from the mold and by machining the edge areas (52 _t 5 * 0 and an outward part of each wall (61, 63). 4 ·. Method according to Claim 3, characterized by simultaneous Relocation of those lying under the edge areas (52, 54) Part i: the tire sidewall with the edge areas for training a rib (14, 16) with each of the walls (61, 63) which the respective edge regions (52, 54 ·) outwardly with respect to the middle part (50) carries. 5. The method according to claim 4 ·, characterized in that at Relocation of the edge areas (52, 54) and the underlying side wall, the ribs (14-, 16) with respect to the middle Part (50) are formed outwards and that the one Part of each side wall lying under the edge regions (52, 54), adjacent to each wall (61, 63) of the strip, with respect to the sidewall outline (56) is moved outwards than the remainder of the side wall forming each rib. 709816/0939