Claims
- 1. A pneumatic tire having a tread surface comprised of a plurality of tread design elements having different pitch lengths arranged to extend around the circumference of the tread surface, at least one series of said tread design elements defining a fundamental period, each said series beginning with a first appearing element having a pitch of the shortest pitch length P.sub.min and including at least one element having a pitch of the longest pitch length P.sub.max between said element having the pitch of P.sub.min and a second appearing element having a pitch of P.sub.min in a next period, each said fundamental period beginning with said pitch of P.sub.min and ending with a pitch located immediately before said pitch of P.sub.min located first in the next period, wherein (1) each said fundamental period is a pitch arrangement such that when Fourier expansion of a stepped waveform formed by pitch lengths as abscissas and reciprocals of the pitch lengths as ordinates is conducted, the proportion of components of each higher order in the range of a second order to a fourth order relative to the first-order component is 80 to 200%, (2) the number of said fundamental periods is 1 to 4, (3) the length of said pitch arrangement(s) of all of said fundamental periods of said tire is 60% or more of the total circumferential length of the tire, and (4) the length of each said fundamental period is at least 1/7 of the total circumferential length of the tire.
- 2. A pneumatic tire having a tread surface as defined by claim 1, wherein the number of kinds of tread design elements within said fundamental period is 3 to 8.
- 3. A pneumatic tire having a tread surface as defined by claim 1, wherein the ratio of the length of different tread design elements within said fundamental period to the length of a tread design element adjacent thereto is 1.02 to 1.45.
- 4. A pneumatic passenger car tire having a tread surface comprised of a plurality of tread design elements having different pitch lengths arranged to extend around the circumference of the tread surface, at least one series of said tread design elements defining a fundamental period, each said series beginning with a first appearing element having a pitch of the shortest pitch length P.sub.min and including at least one element having a pitch of the longest pitch length P.sub.max between said element having the pitch of P.sub.min and a second appearing element having a pitch of P.sub.min in a next period, each said fundamental period beginning with said pitch of P.sub.min and ending with a pitch located immediately before said pitch of P.sub.min located first in the next period, wherein (1) each said fundamental period is a pitch arrangement such that when Fourier expansion of a stepped waveform formed by pitch lengths as abscissas and reciprocals of the pitch lengths as ordinates is conducted, the proportion of components of each higher order in the range of a second order to a fourth order relative to the first-order component is 80 to 200%, (2) the number of said fundamental periods is 1 to 4, (3) the length of said pitch arrangement(s) of all of said fundamental periods of said tire is 60% or more of the total circumferential length of the tire, and (4) the length of each said fundamental period is at least 1/7 of the total circumferential length of the tire.
- 5. A pneumatic passenger car tire having a tread surface as defined by claim 4, wherein the number of kinds of tread design elements within said fundamental period is 3 to 8.
- 6. A pneumatic passenger car tire having a tread surface as defined by claim 4, wherein the ratio of the length of different tread design elements within said fundamental period to the length of a tread design element adjacent thereto is 1.02 to 1.45.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-112545 |
May 1988 |
JPX |
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Parent Case Info
This application is a continuation-in-part application of application Ser. No. 07/350,175, filed May 8, 1989, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
3630590 |
Mar 1988 |
DEX |
285407 |
Nov 1989 |
JPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
350175 |
May 1989 |
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