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Bead member manufacturing method, a bead member and a pneumatic tire

A manufacturing method and component technology, applied to tire components, vehicle components, tires, etc., can solve problems such as unrevealed solutions, increased winding times of wires or cords, and increased restraining force

Inactive Publication Date: 2020-05-08
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in order to increase the force for suppressing the protruding from the winding start end and the winding end end, it is necessary to increase the number of windings of the wire or cord
In addition, the more the number of windings is increased, the more the wound wires and cords will cut the bead core and the bead filler which is assembled to the tire in contact with the bead core, and the bead core and the bead filler will appear. Adhesion tends to decrease
[0004] Although Patent Document 4 describes a device for winding a rubber belt around a bead core, it relates to a technique for smoothly peeling off the rubber belt from the outer peripheral surface of the drum, and concerns the above-mentioned tightness between the bead core and the bead filler. Articulation, no implications for its solution

Method used

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  • Bead member manufacturing method, a bead member and a pneumatic tire
  • Bead member manufacturing method, a bead member and a pneumatic tire
  • Bead member manufacturing method, a bead member and a pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0035] figure 2 A part of the bead core 5 (the part including the bead wire winding start end and the winding end end) in the first embodiment is shown in . image 3 is along figure 2 A cross-sectional view of the A-A direction. The bead core 5 is formed by overlapping a bead wire 6 . Neither the number of segments and rows of the bead wire 6 to be wound nor the overall cross-sectional shape of the bead core 5 to be wound is limited to this embodiment. One end of the bead wire 6 is a winding start end R1 (hatched area), and the other end is a winding end end R2 (hatched area). In the region of the bead core 5 including the winding start end R1, a thin and long strip-shaped rubber 7 is wound, thereby bundling the bead wire 6 and suppressing the bead wire 6 from winding. Protrusion of the starting end R1. The belt-shaped rubber 7 is also wound around the region including the winding end portion R2 of the bead core 5 , similarly suppressing the protruding of the winding st...

no. 2 approach

[0047] Since the second embodiment has the same configuration as the first embodiment except for the configuration described below, the common points will be omitted and the differences will be mainly described. Components that are the same as those described in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted. In addition, a plurality of modified examples described can be used in combination without particular limitation. This is also the same in the third and fourth embodiments.

[0048] refer to Figure 4 A second embodiment will be described. In this embodiment, the winding start end R3 and the winding end end R3 are formed to the extent that a part of the winding start end R3 and a part of the winding end end R4 overlap each other in the bead core circumferential direction. R4 is close. Therefore, the winding start end portion R3 and the winding end end portion R4 are wound by one strip of rubber 8 . The strip-sh...

no. 3 approach

[0051] refer to Figure 5 as well as Figure 6 A third embodiment will be described. In this embodiment, after the bead wire bundling process, one end of the bead wire 6 including the winding start end and the winding end end of the annular bead core 5 or The region including the two ends is heated, so that the upper layer rubbers 6b of the adjacent wires 6a are fused and bonded to each other. Figure 5 A cross-sectional view of the bead core 5 subjected to such a heating step is shown. The heating step is preferably performed before the bead filler forming step. When the upper layer rubbers 6b of the adjacent wires 6a are fused and bonded together, the wires 6a are easily fixed, thereby further suppressing the winding start end or winding end end of the bead wire 6. There is a problem of protruding toward the outer diameter side of the annular bead core 5 .

[0052] The heating temperature is preferably 60° C. or higher at which the upper layer rubber 6 b is sufficiently...

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Abstract

The invention provides a bead member which is capable of suppressing the projection of the winding start end and the winding finish end of the bead wire and is further excellent in the adhesiveness between the bead core and the bead filler. The bead member manufacturing method in the present invention includes a bead core forming step of winding and stacking a bead wire (6) from a winding start end (R1) to a winding finish end (R2) and forming a bead core (5) having an annular shape, the bead wire (6) being formed by coating an outer circumferential surface of a metal wire with a topping rubber; and a bead wire banding step of winding a tape-shaped rubber (7) around one or both of the winding start end (R1) and the winding finish end (R2), wherein tackiness of the tape-shaped rubber (7) ishigher than tackiness of the topping rubber.

Description

technical field [0001] The present invention relates to a method for manufacturing a bead member, a bead member, and a pneumatic tire. Background technique [0002] Pneumatic tires use an annular bead core in which a bead wire obtained by covering a metal wire with an upper layer of rubber is laminated. For example, Patent Document 1 discloses an annular bead core formed by stacking strands obtained by arranging a plurality of bead wires in parallel, whereby To form a bead core; Patent Documents 2 and 3 describe an annular bead core formed by overlapping one bead wire. Although such an annular bead core has a winding start end of the bead wire and a winding end end, in the process of manufacturing a bead member including the bead core, the winding start end The bead core portion and the winding end portion sometimes protrude toward the outer diameter side of the annular bead core. Therefore, as in Patent Documents 2 and 3, a method is known in which a thread or a cord mad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D30/48B60C15/04
CPCB29D30/48B29D2030/482B60C15/04B60C2015/042B60C2015/044B60C2015/048B29D2030/486B60C15/06
Inventor 中西淳志
Owner TOYO TIRE & RUBBER CO LTD
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