Variable-Pitch Precured Tire Tread for Tonal Noise Reduction

The patent applies local quality by varying the pitch sequence of tread elements at different locations around the tire circumference. Specifically, the tread pattern transitions from a first pitch sequence at one end to a second pitch sequence at the other end, creating different pitch characteristics in different regions. This local variation eliminates the consistent tonal noise produced by uniform mono-pitch treads while maintaining manufacturing efficiency through a single precured tread design.

The patent implements segmentation by dividing the continuous precured tire tread into multiple discrete pitch sequences along its length. Each segment contains a specific pitch pattern, and when wrapped around the tire, these segments create the desired variable pitch effect. This segmentation approach achieves noise reduction through pitch variation while maintaining relatively simple manufacturing processes and tread design.

The patent applies preliminary action by pre-configuring the pitch sequences in the precured tire tread before it is installed on the tire. The variable pitch pattern is already established in the tread design, with different pitch sequences positioned at specific locations along the tread length. This preliminary configuration ensures that when the tread is wrapped and installed, the correct pitch sequences are in the correct positions without requiring complex cutting or assembly operations, thereby reducing precision requirements.