Manufacturing method for pneumatic tire
A technology for pneumatic tires and a manufacturing method, which is applied to tire parts, without separate inflatable pads, tires, etc., can solve problems such as insufficient pressure absorption, and achieve the effects of suppressing rigidity gap, suppressing exposure, and increasing rubber thickness.
Inactive Publication Date: 2012-10-24
SUMITOMO RUBBER IND LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
In addition, as a reason for promoting bare (b), it is also proposed that the pressure during vulcanization cannot be sufficiently absorbed due to the omission of the bead reinforcing layer to reduce the thickness of the bead portion (a)
Method used
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Embodiment
[0080] formed with such figure 1A green tire (tire size: 195 / 65R15) having the basic structure shown and including the structure of the bead portion having the specifications shown in Table 1; and molding defects etc. during vulcanization were detected. Further, for comparison, the same test was carried out on a green tire (Comparative Example 1) including a sidewall rubber edge located between a core outer point and a core inner point as shown in FIG. Figure 5 The same test was carried out for the shown green tire (Comparative Example 2) comprising the sidewall rubber edge located further outside the core outer point in the tire radial direction and the inner liner rolled up around the bead core.
[0081] The test procedure is as follows.
[0082]
[0083] One thousand of the above-mentioned green tires were formed in vulcanization by using a mold, and bareness occurring in sidewall edges was checked with the naked eye. Estimate the incidence of nudity; the lower the num...
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Abstract
A manufacturing method for pneumatic tire includes a process in which a raw cover (2) for a tire is formed, and a vulcanization process in which said raw cover (2) is inserted into a mold (3) and subjected to vulcanization molding. With the raw cover (2) inserted into the mol d (3), a sidewall rubber edge (E), whi ch is a boundary part between a bead chafer (13) and a sidewall rubber (12) that appears on an outer surface (2a) of the raw cover, is located further to the i nsi de of the ti re in the radi al di recti on than an inner core point (P1), which is the intersection point between the outer surface (2a) of the raw cover and an axial line (L1) that passes through a bead core (7) on the inner edge of the ti re in the radial direction. The manufacturing method is characterized in that an outer edge (15Bo) of a turn-up part (15B) of an insulation rubber (15) passes between a turn-up part (9b) of a carcass ply (9a) and the sidewall rubber (12), and terminates further to the outside of the ti re in the radial direction than the sidewall rubber edge (E).
Description
technical field [0001] The present invention relates to a method of manufacturing a pneumatic tire capable of suppressing the occurrence of bareness in the vicinity of sidewall rubber edges while improving durability. Background technique [0002] Recently, a pneumatic tire has been known to have improved noise characteristics and ride comfort because a bead reinforcing layer disposed in isolation from a carcass is omitted to lower the rigidity of a bead portion. However, such a pneumatic tire has a problem that nudity (b) tends to occur on the tire surface of the bead portion (a), as shown in FIG. 4(a). The term "naked" is defined as an indentation (defect) produced on the surface of a vulcanized tire due to vulcanization of a raw cover of the tire by vulcanizing the raw cover of the tire by using a mold while keeping Air. [0003] The inventors of the present invention found that, as shown in FIG. 4(b), during vulcanization, the sidewall rubber edge (e) (i.e., the radial...
Claims
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IPC IPC(8): B29D30/30B29D30/72B60C5/14B60C13/00
CPCB29D30/1628B29D30/32B29D30/72B29D30/3028B29D2030/3292B60C2015/0614B60C2015/0617
Inventor 足立幸繁
Owner SUMITOMO RUBBER IND LTD