Raw tire forming method and raw tier forming apparatus

A technology for raw tires and carcasses, which is applied to tires, other household appliances, household appliances, etc., can solve the problems of clamping and fixing the carcass cord a, deformation of the winding part, and inability to stand up, and achieves the path of the carcass cord. Stabilization, reduction in miniaturization, and realization of the effect of device cost

Inactive Publication Date: 2011-06-15
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the case where the above-mentioned lock ring B1 is provided with a notch, the carcass ply a cannot be sandwiched and fixed between the bead cores b at the part of the notch, and the carcass ply a cannot be fixed. The above-mentioned protruding part a1 rises outward in the radial direction
Therefore, problems such as lowering of winding accuracy and deformation of the winding portion occur at the position of the cutout portion.

Method used

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  • Raw tire forming method and raw tier forming apparatus
  • Raw tire forming method and raw tier forming apparatus
  • Raw tire forming method and raw tier forming apparatus

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Embodiment Construction

[0050] Next, embodiments of the present invention will be described in detail. figure 1 The radial cross section of the bead portion 4 in the case where the tire 1 having a bead strip structure is a radial tire for trucks. The tire 1 includes at least a carcass 6 extending from the tread portion having a contact surface through the sidewall portion 3 The bead core 5 of the bead portion 4 is provided with a well-known belt layer for tread reinforcement on the outside in the radial direction of the carcass 6 and inside the tread portion.

[0051] The above-mentioned carcass 6 is composed of a carcass cord 6A, which is formed by wrapping the carcass cords (steel cords) in parallel with the cord arrangement body after the rubber is applied. In the case of a tire, the carcass cords are arranged at an angle of 75 to 90 degrees with respect to the tire circumferential direction.

[0052] In addition, the carcass cord 6A continuously has carcass turn-up portions 6b on both sides of ...

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Abstract

The invention provides a raw tire forming method and a raw tire forming apparatus enabling a tire body cord of a tire bead structure to reel a bead core with high accuracy and high efficiency. The raw tire forming method comprises a tire cylinder forming process which has a joint step of seaming the circumferential end edges of a tire body cord encircling a central drum for a round through a slide fastener, a side drum lateral shifting process, in which the side drum moves from a separating status to an approaching status of approaching the central drum and receiving the outer end part of the tire body cylinder, a tire bead locking process, in which the bead core externally inserted in an outer end part is maintained through the expanding of a locking ring disposed on the side drum, and a tire body reeling process, in which the protruding part of the tire body cylinder reels around the bead core. The tire body reeling process comprises a step of making the protruding part stand up through the cord disposed at a position that is more adjacent to the outer side of the axle center direction compared with a locking ring covering a ring expanding.

Description

technical field [0001] The present invention relates to a green tire forming method and a green tire forming apparatus for efficiently and accurately forming a green tire having a so-called bead wind structure in which both ends of a carcass ply are wound. A structure in which the bead core is wound and locked. Background technique [0002] For example, Patent Document 1 below proposes a bead forming apparatus for a tire having a bead strip structure. Such as Figure 17 As shown, in this bead forming device, there are bead core supporting units on both sides of a forming head A that forms a cylindrical carcass tube by wrapping a sheet-shaped carcass ply a around its outer peripheral surface. B, which has a diameter-expandable locking ring B1 that supports the bead core b inserted into the above-mentioned carcass tube by expanding its diameter; winding unit C, which has a cord winder capable of moving inward and outward in the axial direction Ring C1. [0003] Patent Docum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D30/32
Inventor 鬼松博幸
Owner SUMITOMO RUBBER IND LTD
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