TH88635A - Method for producing rubber elements for car tires - Google Patents

Abstract

The DC60 in the strip winding method provides a method for fabricating a rubber compound for motor tires that can reduce residual air in the rubber compound. The rubber compound has a first inner layer formed by winding a strip of rubber in a coil from a starting point relative to one of the reference positions of the center of the wound body and side edge to another reference position in the axial direction in the halfway point between the center and the outer edge in the axial direction of the tire of the wound area, and a second layer formed by folding back from a starting point relative to another reference position in the axial direction, and the reference position relative to the starting point is defined as a position linearly symmetrical around the center position. In the strip winding method, the invention provides a method for fabricating a rubber compound for motor tires that can reduce residual air in the rubber compound. The rubber compound has a first inner layer formed by winding a strip of rubber in a coil from a starting point relative to one of the reference positions of the center of the wound body and side edge to another reference position in the axial direction in the halfway point between the center and the outer edge in the axial direction of the tire of the wound area. The intertwined area, and the second layer formed by folding back from the starting point relative to another reference position to another position in the axial direction, and the reference position relative to the starting point is defined with regard to a position of linear symmetry around the central position.

Claims (7)

1. Method of manufacture of rubber compound (G) for motor vehicle tires (1) The rubber compound (G) is made up of inner radial rubber layers (11A, 11B) and outer radial rubber layers (12A, 12B) on the vehicle. The method of manufacture of the rubber compound (G) involves wrapping two unvulcanized rubber ribbons (T) in a coil around the wrapping area (Lh, Lh) of the cylindrical wrapped body (14), which is characterized by: The inner radial rubber layer (11A, 11B) is formed by folding two rubber strips (T) in a coiled manner from each of the two starting points corresponding to the outer axial edge (Te) of the coiled area (Lh, Lh), respectively, to the center axial position (Tc) between the outer axial edge (Te). The outer radial rubber layer (12A, 12B) is formed by continuously coiling the aforementioned two rubber strips (T) in a coiled manner from the aforementioned center axial position (Tc) to each starting point corresponding to the outer axial edge (Te). 2. Method of manufacturing the rubber components (G) for motor vehicles (1), as claimed in claim 1, in which the tires assembled from a number of rubber layers (11A, 11B; 12A, 12B) are identical. 3. Method of manufacturing the rubber components (G) for the tires (1) as claimed in claim 1, in which the second layer (12A, 12B) is formed and is folded back at the center position (Tc) so that it is wrapped to each outer edge (Te). 4. Method of manufacturing the rubber compound (G) for tires (1) as claimed in Claim 1, in which such rubber compound (G) is a tread pattern (G1) first layer (11A, 11B) is assembled by flattened rubber layers and second layers (12A, 12B) are coiled in such a manner to achieve a similar thickness variation to the tread pattern (G1) in the raw tire. 5. Method of manufacture of rubber components (G) for tires (1) as claimed in claim 1, in which the wrapped body (14) is assembled by a molded section (14) on which strips (10) of the tread reinforcement body are wrapped on the outermost radial direction, and a finished surface section (14Aa) which connects the leading ends of the rubber strips to the molded section (14) is formed on the surface of the molded section (14) extending outward from the strips (10) in the axial direction. 6. Method of manufacture of rubber compound (G) for tires (1), as claimed in claim 1, in which such rubber compound (G) is constructed in such a way that an additional layer (13B) formed on the outermost radial side forms a bulge (a) radially outward in the shoulder section of the tread (G1). 7. Method of manufacturing the rubber component (G) for the tires (1) as claimed in claim 1, in which such rubber strip (T) is compressed in the area where it can be compressed by a compression roller (RT) of the shape of a straight rod of uniform diameter and able to move close to and away from the wrapped body (14) in a parallel manner at the time of wrapping.