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Variable diameter mixing assembly drum for manufacturing tires including blockable grooves

A tire building drum, variable technology, used in the field of tire manufacturing

Active Publication Date: 2016-05-04
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, it was found that the tire building drum required for the manufacture of a self-supporting run-flat tire of one size differed from the drum used for the manufacture of conventional non-self-supporting tires only by the presence of the aforementioned grooves

Method used

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  • Variable diameter mixing assembly drum for manufacturing tires including blockable grooves
  • Variable diameter mixing assembly drum for manufacturing tires including blockable grooves
  • Variable diameter mixing assembly drum for manufacturing tires including blockable grooves

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] figure 1 The tire building drum shown in , comprises a first set of cylindrical sections 4 displaceable in radial direction under the action of annular bladders 3 and distributed circumferentially around a motor axis (not shown). around the meridian plane and figure 1 The same second set of moving parts (not shown) symmetrical to the part 4 shown in , are also distributed circumferentially around the motor axis. The moving parts of these two subgroups make up all the moving parts of the tire building drum.

[0029] Each pair of moving parts, consisting of two moving parts symmetrical around the meridian plane, supports the middle part 7 by means of a mandrel 8 , via which there is free access to an axial duct 80 formed in each moving part 4 .

[0030] These moving parts 4 and intermediate parts 7 support elements 41 , 42 , 5 , 45 , 7 whose outer radial parts form receiving surfaces of generally cylindrical shape.

[0031] If the motor shaft rotates, it causes the rec...

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PUM

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Abstract

Variable-diameter building drum intended for the manufacture of a green tire having a generally cylindrical receiving surface formed of radially mobile sectors and bearing elements the radially external part of which constitutes the receiving surface, the receiving surface comprising at least one circular groove containing an elastic circumferential sleeve which is held radially away from the bottom of the groove by pushers able to move radially with respect to the mobile sectors so as to align the radially external surface of the sleeve with the receiving surface when the drum is brought to a first laying diameter, and which is pressed against the bottom of the groove under the effect of circumferential elastic tensions when the drum is placed at a laying diameter greater than the said first laying diameter. Disengageable locks are able to keep the pushers in the position in which the radially external surface of the sleeve is aligned with the receiving surface regardless of the diameter to which the said receiving surface is brought.

Description

technical field [0001] The present invention relates to the field of tire manufacturing and more particularly to tire building drums for assembling so-called self-supporting run-flat tires. Background technique [0002] The building of these tires is characterized by the fact that they comprise thicker rubber profile elements arranged in the sidewalls and usually placed between the inner liner and one or more carcass reinforcing plies. The purpose of these products is to carry the load when the air pressure in the tire casing is no longer able to perform the task. [0003] Due to this arrangement, the shaping of this type of tire requires special precautions in order to guarantee the correct engagement between the profile elements and to avoid trapping air between said profile elements, especially when using cylindrical drums. [0004] This is because the meridian profile acting as the receiving surface for the carcass reinforcement ply is found to be relatively inhomogeneo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D30/24
CPCB29D30/244B29D30/20B29D30/26B29D2030/201B29D2030/2614B29D2030/265
Inventor F·德纳维S·拉瓦
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN