Patent ID: 7677288
Filing Date: 2010-03-16
Classification: B60C,Y10T

Abstract:
1. A pneumatic tire in which end parts of respective two carcass plies are wound up around each of bead cores respectively embedded in paired left and right bead parts from an inner side of the tire to an outer side of the tire, and in which a direction where cords extend in one of the two carcass plies crosses over a direction where cords extend in the other of the two carcass plies, wherein the direction where the cords extend in each of the two carcass plies is set at an angle of 75 to 88° to a tire circumferential direction, a first filler rubber and a cord reinforcement layer are included in each wound-up portion consisting of the carcass plies, the cord reinforcement layer being arranged on an outer side of the first filler rubber in a tire width direction, a second filler rubber is arranged on an outer side of each wound-up portion consisting of the carcass plies in the tire width direction, out of the two carcass plies, the carcass ply located on the outer side of the tire has a configuration in which a wound-up end part of the carcass ply is wound up to such a position as to cause the wound-up end part to overlap an outer side of a main body portion of the carcass ply, a relationship among a height 2TUH of the wound-up end part of the carcass ply located on the outer side of the tire in a tire radial direction, a height 2FLH of an uppermost end of the second filler rubber in the tire radial direction, a height 1FLH of an uppermost end of the first filler rubber in the tire radial direction, and a height RFH of an uppermost end of the cord reinforcement layer in the tire radial direction is established to satisfy 2TUH>2FLH>1FLH>RFH, and each of the heights 2TUH, 2FLH, 1FLH and RFH in the tire radial direction has the following relationship with a height SH of a cross-section of the tire,