Method and device for constructing a radial tire
View Patent ↗Device and method for building a radial tire. The device includes a first drum device for building a belt package and a transfer device for transferring the belt package from the first drum device to a second drum device having arranged thereon a carcass tube from at least one airtight inner layer, a carcass play and two bead cores with core profiles. The second drum device is arranged between core clamping devices and is structured and arranged to join the carcass tube and the belt package during expansion of the second drum device. The belt package is contoured or shaped by deformation via the second drum device. This abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.
1. A method for building a radial tire comprising:
building a belt package on a build-up drum having a cylindrical outside circumference;
building a carcass tube having an airtight inner layer, at least one carcass ply and two bead cores with core profiles;
transferring the carcass tube to a segmented building drum arranged between axially movable core clamping devices each comprising an inflatable bellows, the outsides of the building drum segments forming the outside of the building drum;
transferring, with a transferring device having an inflatable collar, the belt package to the building drum and positioning the belt package over the carcass tube;
expanding the building drum;
joining the carcass tube to the belt package using the building drum and the transferring device such that a contour of the belt package is shaped in a manner in which a zenith of the belt package is stretched by expansion movement of the building drum against the inflatable collar and shoulder areas of the belt package are compressed by expansion of the inflatable collar of the transferring device, said inflatable collar extending from one side of the belt package to another side of the belt package and the diameter of said building drum, when expanded, being larger in the zenith and smaller in the shoulder areas than an inside diameter of the belt package prior to the belt package being shaped; and
winding plies of bandage strips over an entire width of the belt package while the belt package is arranged on the building drum,
wherein the belt package is contoured or shaped on the building drum during the joining and before the winding.
2. The method of claim 1 , wherein the building drum has an outside shape which corresponds to or is similar to a cross-sectional contour of the belt package of a finished tire.
3. The method of claim 1 , wherein the belt package comprises one of:
at least two belt plies; and
at least two automatically spliced belt plies.
4. The method of claim 1 , further comprising, during the expansion of the building drum, moving the core clamping devices laterally.
5. The method of claim 1 , further comprising placing the carcass ply under tension during the expanding.
6. The method of claim 1 , wherein the winding plies of bandage strips occurs in a spiral manner utilizing one or more winding heads.
7. The method of claim 6 , further comprising moving the one or more winding heads parallel to an axis of the building drum.
8. The method of claim 6 , further comprising moving the one or more winding heads in a manner which follows a contour of the belt package.
9. The method of claim 6 , further comprising one of:
adjusting the one or more winding heads perpendicular to a surface of the belt package; and
aligning the one or more winding heads perpendicular to a surface of the belt package.
10. A method for building a radial tire comprising:
building a belt package on a build-up drum having a cylindrical outside circumference;
building a carcass tube having an airtight inner layer, at least one carcass ply and two bead cores with core profiles;
transferring the carcass tube to a segmented building drum arranged between axially movable core clamping devices each comprising an inflatable bellows, the outsides of the building drum segments forming the outside of the building drum;
transferring, with a transferring device having an inflatable collar, the belt package to the building drum;
stretching and shaping the belt package on the carcass tube using the inflatable collar and the building drum such that a zenith of the belt package is stretched by expansion movement of the building drum against the inflatable collar and shoulder areas of the belt package are compressed by expansion of the inflatable collar, said inflatable collar extending from one side of the belt package to another side of the belt package and the diameter of said building drum, when expanded, being larger in the zenith and smaller in the shoulder areas than an inside diameter of the belt package prior to the belt package being shaped;
after the stretching and shaping, moving the transferring device away from the building drum; and
after the moving, winding, with at least one winding head, plies of bandage strips over an entire width of the stretched and shaped belt package while the belt package is arranged on the building drum.
11. The method of claim 10 , further comprising:
during the expansion of the building drum, moving the core clamping devices laterally; and
after the winding, heating the tire in a vulcanizing mold.