Pneumatic tire

Abstract

The present invention relates to a pneumatic tire which comprises a partial tie rubber layer exclusively disposed at a portion between a carcass layer and an inner liner layer, and more specifically provides a pneumatic tire capable of achieving a further reduction in the weight of the tire while maintaining air impermeability and steering stability and achieving an excellent balance between thesecharacteristics. A partial tie rubber layer 40 is disposed between a carcass layer 4 and an inner liner layer 9 and disposed over an area other than the leading end of a bead portion 3. The amount ofprotrusion L1 of the partial tie rubber layer 40 towards the bead portion 3 with respect to a perpendicular line P drawn from the outermost end of a belt layer 7 in the tire width direction to the inner liner layer 9 is set to 0.25 to 0.80 times the peripheral length L2 along the tire inner surface from the intersection A between the perpendicular line P and the tire inner surface to the leadingend point B of a bead toe.

Description

technical field [0001] The present invention relates to a pneumatic tire provided with a partially bonded rubber layer (Japanese: Partial タイゴム layer) that is limitedly arranged between a part of the carcass layer and an inner liner. A pneumatic tire that achieves further reduction in tire weight while handling stability and satisfactorily balances these performances. Background technique [0002] In pneumatic tires, a joint rubber layer is generally disposed between the carcass layer and the inner liner in order to prevent the carcass cord from biting into the inner liner when the unvulcanized tire is inflated during tire manufacture. With regard to such a joint rubber layer, in recent years, in order to achieve a reduction in tire weight and rolling resistance, it is proposed to use not the entire area between the carcass layer and the inner liner but the shoulder areas on the left and right. The selectively arranged part joins the rubber layer (for example, refer to Paten...

AI Technical Summary

Problems solved by technology

However, with regard to such partial joint rubber layers, each partial joint rubber layer provided in each shoulder region has a pair of ends (an end on the tire equator side and an end on the outer side in the tire width direction), so that the tire component parts The base point of peeling between the tires and / or the number of ends that may become non-crimped portions during manufacture may increase, which may affect the manufacturability of the tire

[0004] On the other hand, if an attempt is made to reduce the amount of the joint rubber layer used by narrowing the width of the conventional full joint rubber layer, it is difficult to obtain a sufficient tire weight reduction effect while maintaining a high level of air permeability prevention and steering stability. properties, it is difficult to balance these performances well, so further improvement is required for the structure and / or arrangement of the partially bonded rubber layer

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