Method for manufacturing raw tyre for automatic bicycle

A technology of an automatic two-wheeled vehicle and a manufacturing method, which is applied in the directions of tires, applications, household appliances, etc., can solve problems such as difficulty in transportation, storage and handling, and achieve the effect of suppressing process loss.

Inactive Publication Date: 2011-09-21
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the transportation, storage, and attachment of the rubber material extruded by the rubber extruder with an arc-shaped cross-section are difficult, and it is extremely difficult to implement the method.

Method used

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  • Method for manufacturing raw tyre for automatic bicycle
  • Method for manufacturing raw tyre for automatic bicycle
  • Method for manufacturing raw tyre for automatic bicycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] Based on the manufacturing method of the present invention, with the specifications in Table 1, the tire specifications of 190 / 50Z R17 and 160 / 60ZR17 were trial-produced for motorcycle tires for motorcycles. Ripple (snake pattern) and the incidence of defective products were compared.

[0082] Each tire differs only in the method of forming the tread cylinder, as described in Figure 9As shown in (A), in Conventional Examples A1 and B1, the two sides of the tread cylinder formed in a cylindrical shape are gathered and bonded to the raw tire body by a pressing device. In addition, in the tire of the tire standard (190 / 50Z R17), the carcass and the belt layer have the following specifications.

[0083] ·Carcass

[0084] Number of curtains: 1 piece

[0085] Carcass cord: Nylon: 1400dtex / 2

[0086] Number of cords inserted: 35 / 5cm

[0087] Cord angle: 90° (angle relative to the circumferential direction)

[0088] ·Belt

[0089] Number of curtains: 1 piece

[0090] Co...

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PUM

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Abstract

The subject of the invention is to inhibit the reduction in appearance quality and uniformity by inhibiting folds stacking on the two end portions of tread rubber caused by downward press fit, thus providing a method for manufacturing a raw tyre for an automatic bicycle. In the manufacturing method, a tread tube forming process comprises: a tread rubber coiling step of forming cylindrical tread rubber on a rubber-made cylindrical tread forming drum which is expandable into a drum shape through the filling of internal pressure; a tread rubber bending step of, by employing a conveying ring with an inner peripheral surface as a circular-arc-shaped surface approximate to the tread, pushing the tread rubber to the inner peripheral surface of the conveying ring through the expansion of the tread forming drum formed through the filling of internal pressure, thereby bending the cylindrical shape of the tread rubber into a convex circular-arc shape; and a belt forming step of, in the circumferential direction of the tyre, forming a belt by spirally attaching a belt-like cord, formed by dispensing glue to a cord thread, to the inner peripheral surface of the tread rubber retained on the conveying ring.

Description

technical field [0001] The present invention relates to a method for manufacturing raw tires for motorcycles, which improves tire uniformity by eliminating the accumulation of wrinkles at both ends of tread rubber caused by downward pressing. Background technique [0002] In motorcycle tires, the tread portion is formed into a convex arc-shaped profile with a small radius of curvature in view of the property that the vehicle body is largely inclined and turned. Therefore, in order to form the tread portion of such a tire, conventionally, such as Figure 9 As shown in (A), using a profile plate b whose outer peripheral surface approximates the circular arc shape of the tread, a belt ply c and tread rubber d are sequentially laminated along the outer peripheral surface of the profile plate b to form a tread portion forming The one-piece tread cylinder e. In this case, there is no problem with the belt cord c, since a narrow belt-shaped cord formed by dipping the belt cord wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D30/08
Inventor 石川毅
Owner SUMITOMO RUBBER IND LTD
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