Tyre Tread Sipe Chamfer Layout for Ride Comfort and Wear
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Solution Overview
Problem
Pneumatic tyres with many lateral grooves or lug grooves in the tread portion tend to have worse wear resistance, which compromises the ability to improve ride comfort and wear resistance simultaneously.
Innovation Solution
A tyre design featuring a tread portion with specific land portions and grooves, including outboard and inboard middle and shoulder land portions with inclined sipes and chamfered edges, which are strategically positioned and configured to enhance wear resistance and ride comfort by reducing rigidity at the ends while maintaining central rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If many lateral grooves or lug grooves are provided in the tread portion to improve ride comfort, then ride comfort is improved, but wear resistance deteriorates
Solution Approach 1:
The patent applies local quality by providing chamfer portions only at specific locations (sipe-edge portions) rather than uniformly across the entire tread. The chamfer portions are strategically placed at the ends of sipes in the middle and shoulder land portions, creating localized rigidity reduction zones that improve ride comfort without compromising the overall wear resistance of the tread structure.
Solution Approach 2:
The patent segments the tread portion into distinct functional zones: crown land portion, middle land portions, and shoulder land portions. Each zone has different sipe configurations and chamfer arrangements, allowing independent optimization of ride comfort and wear resistance in different regions of the tyre contact patch.
2Ease of operation
If sipe-edge portions are provided with chamfer portions to reduce rigidity and improve ride comfort, then ride comfort is improved, but wear resistance may deteriorate
Solution Approach 1:
The chamfer portions are provided only at sipe-edge portions in the middle and shoulder land portions, not in the crown land portion. This localized approach reduces rigidity where it most affects ride comfort (at the edges of the contact patch) while maintaining the structural integrity and wear resistance of the central crown region.
Solution Approach 2:
Instead of providing chamfer portions across the entire tread width, the patent applies them partially only to specific sipe-edge portions in the middle and shoulder land portions. This partial action is sufficient to improve ride comfort by reducing edge rigidity while avoiding the excessive rigidity reduction that would compromise wear resistance.
Data Source
AI summary
A tyre includes a crown land portion, an outboard middle land portion, an outboard shoulder land portion, an outboard crown circumferential groove, an outboard shoulder circumferential groove, an inboard middle land portion, an inboard shoulder land portion, an inboard crown circumferential groove, and an inboard shoulder circumferential groove. The outboard middle land portion is provided with full-opened outboard middle sipe that are inclined to a tyre axial direction. The outboard middle sipes each have two opposite sipe-edge portions provided with chamfer portions. In each chamfer portion of each outboard middle sipe, chamfer widths at both ends of the outboard middle sipe are larger than a chamfer width of a central portion of the outboard middle sipe. The outboard shoulder land portion is provided with outboard shoulder sipes that are inclined in the same direction as the outboard middle sipes to the tyre axial direction.