Pneumatic radial tires
All-season high-performance radial-ply passenger pneumatic tire
Pneumatic tire tread with varying block lengths and varying main groove widths
ApplicationNo. 109527 filed on 08/20/1993
US Classes:152/209.26, Having circumferential groove width at least 10% per cent of tread width152/209.28Having directional two dimensional pattern (e.g., "v" shaped, etc.)
ExaminersPrimary: Maki, Steven D.
Attorney, Agent or Firm
Foreign Patent References
International ClassB60C 011/13
Foreign Application Priority Data1992-08-25 JP
AbstractA pneumatic tire which comprises a tread provided with circumferential grooves extending continuously circumferentially of the tire,in the cross section of the tire including the tire axis, the cross sectional shape of each of the circumferential grooves being composed of a pair of oppositely opposed radially outer portions extending radially inwardly from the tread surface,the outer portions being curved such that the axial width therebetween increases radially outwardly and the inclination angle of each outer portion to the groove center line (CL) increases radially outwardly, whereby running noise, especially air resonance noise and air pumping noise, is reduced.