Claims
- 1. A heavy duty pneumatic tire preventing uneven wearing comprising main grooves continuously extending in a tread of the tire along a circumference thereof, land portions separated by the main grooves, and stepped means having a flat surface located radially inside a contour line of the tread as viewed sectionally, said stepped means extending substantially continuously in a tire circumferential direction and being positioned in a main groove, said stepped means being comprised of at least one stepped portion bounded on opposite sides by a narrow groove and a narrow cut, respectively, with said narrow groove and said narrow cut each having substantially an identical depth whereby an uneven wear-sacrificed portion is formed by said surface of said stepped means, said uneven wear-sacrificed portion contacting the ground within a ground-contacting area of the tread for supporting a load exerted upon the tire.
- 2. A heavy duty pneumatic tire as set forth in claim 1, wherein said stepped means is comprised of two stepped portions separated by a narrow groove, each stepped portion being separated from an adjacent land by a narrow cut with said narrow groove and each narrow cut having substantially an identical depth.
- 3. A pneumatic tire according to claim 2, wherein the total width "w" of the surface of said stepped portions in a tire axial direction is in a range from 5 to 25% of a ground contact width "B" of the tread.
Priority Claims (2)
Number |
Date |
Country |
Kind |
62-266011 |
Oct 1987 |
JPX |
|
62-265248 |
Oct 1987 |
JPX |
|
Parent Case Info
This is a Continuation of Application Ser. No. 07/838,328 filed Feb. 20, 1992, now abandoned, which is a Continuation of Application Ser. No. 07/257,896 filed Oct. 14, 1988 now U.S. Pat. No. 5,131,444.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
357419 |
Sep 1931 |
GBX |
Continuations (2)
|
Number |
Date |
Country |
Parent |
838328 |
Feb 1992 |
|
Parent |
257896 |
Oct 1988 |
|