Title:
TYRE FOR MOTORCYCLE
Document Type and Number:
Japanese Patent JPS6485802
Kind Code:
A
Abstract:
PURPOSE:To enhance straight line stability and operational stability at the time of high speed travelling by forming a breaker with organic fiber cord having a specific tensile elastic modulus and setting the wall thickness of a tread portion in such a way as to be maximum in the center area, minimum in the both end area, and tapered in the intermediate area therebetween. CONSTITUTION:There is formed a breaker 7 of organ fiber cord which is arranged at a cord angle 10-30 deg. radially outside a carcass 5 and whose tensile elastic modulus is 250-400kg/mm<2>. The wall thickness (a) in an area A which is 25-45% of the width of a tread 2 is the thickest and the wall thickness (b) in a tread end portion area E which is 10-20% of the width of the tread is the thinnest, and (b)/(a) is set to be 0.4-0.8. An area B between the area A and E is formed into taper shape which connects the wall thickness (a) to (b), in such a way to diminish gradually. With this construction, straight line stability and operational stability at the time of high speed travelling can be enhanced.
Inventors:
NAKASAKI EIJI
SHIRASHOJI TAKASHI
SHIRASHOJI TAKASHI
Application Number:
JP24685887A
Publication Date:
March 30, 1989
Filing Date:
September 29, 1987
Export Citation:
Assignee:
SUMITOMO RUBBER IND
International Classes:
B60C3/04; B60C9/08; B60C9/18; B60C11/00; (IPC1-7): B60C9/18; B60C11/00
Domestic Patent References:
| JPS6092903A | 1985-05-24 |
Attorney, Agent or Firm:
Naemura Tadashi