Pneumatic tire with multi-tread cap

摘要

A tread for a pneumatic tire in accordance with the present invention includes a tread base layer, a first tread cap layer radially outside of the tread base layer, a second tread cap layer radially outside of the tread base layer and both radially outside and axially adjacent the first tread cap layer, a third intermediate layer radially between the tread base layer and the first and second tread cap layers. The first tread cap layer has a protrusion extending radially inward and into the third intermediate layer more than a main body of the first tread cap layer and the second tread cap layer thereby allowing the first tread cap layer to provide the overall tread with enhanced performance characteristics after the main body of the first tread cap layer and the second tread cap layer have worn away.

主权项

1. A five rib tread for a pneumatic tire comprising:
a tread base layer; a first tread cap layer radially outside of the tread base layer; a second tread cap layer radially outside of the tread base layer and both radially outside and axially adjacent the first tread cap layer; a third intermediate layer radially between the tread base layer and the first and second tread cap layers, the first tread cap layer having a first protrusion and a second protrusion each extending radially inward and into the third intermediate layer more than a main body of the first tread cap layer and the second tread cap layer thereby allowing the first tread cap layer to provide the overall tread with enhanced performance characteristics after the main body of the first tread cap layer and the second tread cap layer have worn away, the first protrusion and the second protrusion each extending radially inward from two ribs of the five rib tread.