公开(公告)号：JPH03224803A

公开(公告)日：1991-10-03

申请号：JP3782490

申请日：1990-02-19

Applicant: RAILWAY TECHNICAL RES INST ,  BRIDGESTONE CORP

Inventor： ODA KAZUHIRO ,  TAKIZAWA HIDEYUKI ,  AZAGAMI MASAYOSHI ,  KURODA MASAHIRO ,  YAMADA YUKIMASA

IPC: B61B13/06 ,  B60C3/00 ,  B60C9/08 ,  B60C9/18 ,  B60C9/20 ,  B60C11/00

Abstract: PURPOSE:To improve antifrictional characteristic by manipulating the shape or the rigidity of a crown part so that the ground shape of the crown part may take a preset form during the load loaded to a tire reaches a preset ratio of the entire load of a floating car, at the time of taking off and running of the floating car. CONSTITUTION:In a radial tire for a floating car, a cord of at least one ply cord layer that forms a carcass part 42 is arranged almost in a radial direction, while plural belt layers 32 comprising plural reinforcement card layers are placed between the outer surface of a crown part 30 and the carcass part 42. The shape or the rigidity of the crown 30 is determined so that its ground shape may offer a ratio B/A of the ground length B of a shoulder part 48 of the crown part 30 in the direction of the rotation of a tire, to the ground length A of the lateral center part of the crown part 30 in the direction of the rotation of the tire, becomes 0.6 to 1.5, during a load loaded to the tire reaches 45% of a front load of the floating car, at the time of taking off and running of the floating car.

公开(公告)号：JPH0386602A

公开(公告)日：1991-04-11

申请号：JP22266489

申请日：1989-08-29

Applicant: BRIDGESTONE CORP

Inventor： YAMADA YUKIMASA

IPC: B60C11/00 ,  B60C9/08

Abstract: PURPOSE:To improve the abrasion resistance of the center part in the tire width direction by projecting the center part in the tire width direction of a tread part outside in the radial direction within a prescribed range of the width of a belt arranged inside in the tire radial direction of the tread part, a heavy load radial tire for a linear motor car, etc. CONSTITUTION:The width dimension C of a belt layer 50 arranged between a tread part 46 and a carcass 42 is set to about 70 - 95% for the width dimension B of a tire 14, and a projection part 49 is formed towards the outside in the tire radial direction at the center part in the tire width direction of a crown part 48. The width dimension A of the projection part 49 is set to 30 - 70% of the width dimension C of the belt layer 50. With this constitution, the abrasion resistance of the center part in the tire width direction of the crown part can be improved.