公开(公告)号：JP2003146028A

公开(公告)日：2003-05-21

申请号：JP2001343613

申请日：2001-11-08

Applicant: SUMITOMO RUBBER IND

Inventor： MINAMI NOBUAKI ,  MATSUMOTO TADAO

IPC: B60C15/06 ,  B60C1/00 ,  B60C15/00 ,  B60C15/02

Abstract: PROBLEM TO BE SOLVED: To improve stability and controllability without degrading durability and ride comfort. SOLUTION: Along an outer side of bead apex rubber 8, a short-fiber- reinforced rubber layer 10 is arranged in which 10 to 30 parts by weight of short fiber is blended with 100 parts by weight of rubber and the short fiber is oriented in a tire circumference direction. The short-fiber-reinforced rubber layer 10 extends from a bead core 5 to a height position inward of an outer end 8e of the bead apex rubber 8.

公开(公告)号：JP2003146018A

公开(公告)日：2003-05-21

申请号：JP2001349192

申请日：2001-11-14

Applicant: SUMITOMO RUBBER IND

Inventor： MATSUMOTO TADAO

IPC: B60C11/01 ,  B60C11/04 ,  B60C11/13

Abstract: PROBLEM TO BE SOLVED: To improve wet performance without degrading steering stability. SOLUTION: A center region Cr of a tread surface 2 forming a 45% region of a tread grounding width TW has at least one longitudinal groove 3a extending continuously in a tire circumference direction and with the groove center spaced from a tire equator C. An outer groove wall surface about a tire axis direction of the outermost longitudinal groove 3a about the tire axis direction in the center region Cr includes, in an outer portion, a chamfered slant wall portion 8 slanting in a direction to increase a groove width toward the tread surface 2. A land portion outside the longitudinal groove 3a about the tire axis direction has steep slant grooves having an inner end 11i in a position spaced outward of a groove edge 3e by a short distance δ of 1 to 5% of the tread grounding width TW and slanting at an angle of 5 to 30 deg. to the tire circumference.

公开(公告)号：JPH08175119A

公开(公告)日：1996-07-09

申请号：JP33857594

申请日：1994-12-27

Applicant: SUMITOMO RUBBER IND

Inventor： KIKUCHI NAOHIKO ,  MATSUMOTO TADAO ,  OKADA MAIKO

IPC: B60C1/00 ,  B60C11/00 ,  B60C13/00 ,  B60C15/06 ,  C08K3/04 ,  C08K7/00 ,  C08K7/02 ,  C08L7/00 ,  C08L9/00 ,  C08L21/00

Abstract: PURPOSE: To provide a pneumatic tire capable of reducing the rolling resistance without impairing the stability and controllability and the riding comfort. CONSTITUTION: A carcass fold-back end X1 is located at the height Hc of =0.3mm and =90% short fiber is oriented at the angle in the range of ±20 deg. relative to the circumferential direction of the tire, and the ratio of the complex elasticity E*a in this direction of orientation to the complex elasticity E*b in the direction orthogonal to the direction of orientation is >=5.