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Tyre building drum

A tire and matching technology, applied in the field of assembly drums, can solve the problems of increasing length, increasing volume, and being difficult to reach.

Inactive Publication Date: 2003-01-29
MICHELIN & CO CIE GEN DES ESTAB MICHELIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The assembly drum is effective in guaranteeing the production of tires with beads of different diameters, however, due to the presence of the ring, it requires precise adjustment of the ring to ensure its exact centering with respect to the drum, and also increases the volume and especially the length of the latter, making it less accessible and making the drum more mechanically complex

Method used

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Embodiment Construction

[0016] In FIGS. 1A-1B , a radially expandable assembly drum 1 comprises a main body 10 mounted on a central axis 2 and having a receiving surface 3 for assembled products.

[0017] The main body 10 comprises two semi-cylinders 11 and 13, axially movable around the central axis 2, to adjust the bead wire spacing of the resulting tire, and the two semi-cylinders 11 and 13 are axially fixed relative to the central axis 2 by a central mandrel 12 spaced apart.

[0018] The semi-cylinders 11, 13 and the push rod 12 are respectively composed of a plurality of parts 41, 43 and 42, and the parts 41, 42, 43 are arranged circularly around the central axis 2 and aligned. To ensure the fit of the body 10, each part 41 and 43 is connected to the opposite part 42 by a rod 14 passing through part 42, the ends of which are slidingly fitted in holes 15 in parts 41, 43, respectively.

[0019] To enable the drum 1 to reach its inflated position, the parts 41 , 42 , 43 are radially displaceable u...

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Abstract

The invention concerns a radially expansible assembly drum (1) for making a tyre, said drum having a body mounted on a central shaft (3) having a generally cylindrical surface for receiving products to be assembled and ends with different diameters, the drum comprising a lifting device (20, 21) located at each end of the drum body having an outer cylindrical surface (221, 231) for receiving products to be assembled. The invention is characterised in that the lifting device (21) arranged proximate to the end with the smaller diameter is radially mobile relative to the body (10) of the drum (1) between a position wherein its surface (231) has substantially the same diameter as that of the central surface of the body (10) and a position wherein its surface (231) has a diameter smaller than that of the central surface of the body (10), the radial displacement of said retracting device (21) being synchronised with the radial expansion of the drum (1).

Description

technical field [0001] The invention relates to a mounting drum for the manufacture of radially expandable tyres. Background technique [0002] In particular, the invention relates to a method of manufacturing a tire comprising a carcass reinforcement, at least one reinforcing bead wire in each bead of the tyre, wherein the carcass reinforcement forms a turn-up, and comprising beads of different diameters . However, the invention can also be used to manufacture tires without bead wires but with beads of different diameters. [0003] Obviously, the production of this type of tire requires the use of a mounting drum, which itself has receiving sections for tire beads of different diameters. However, due to the inconsistency in the diameter of the receiving portion, problems arise in actual industrial production, and the quality and reliability of the obtained tires are insufficient. [0004] In fact, it is important for the quality and reliability of the tire to place the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D30/24
CPCB29D30/246B29D30/244
Inventor S·拉瓦
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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