Shoulder Sipe Chamfer Layout for Tire Cornering and Noise
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Solution Overview
Problem
Tires with shoulder sipes face a trade-off between improved cornering performance and noise performance, as conventional designs often deteriorate noise quality with enhanced cornering capabilities.
Innovation Solution
A tire design featuring chamfered shoulder sipes with varying chamfer volumes along the sipe length, where the chamfer volume is smaller towards the tread edge, combined with specific sipe angles and configurations, to enhance cornering performance while minimizing noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shoulder sipes are provided in the shoulder land region, then cornering performance is improved, but noise performance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the chamfer volume of sipes in different regions of the shoulder land. Specifically, sipes in the first shoulder land region (closer to the tread center) have a first chamfer volume, while sipes in the second shoulder land region (closer to the tread edge) have a second chamfer volume that is smaller than the first. This localized differentiation allows each region to contribute differently to cornering performance while controlling noise generation, particularly by reducing the chamfer volume in regions that generate more noise during rotation.
2Reliability
If chamfered portions are added to shoulder sipes, then cornering performance is enhanced, but noise generation increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the chamfer volume parameter of sipes based on their axial position. The chamfer volume is set to decrease as the axial distance from the tread center increases. This parameter differentiation allows the sipes to provide enhanced cornering performance through chamfered portions while controlling overall noise generation by having smaller chamfer volumes in regions that would otherwise generate excessive noise during tire rotation.
Data Source
AI summary
A tire has a tread portion including a first shoulder land region. The first shoulder land region is provided with first shoulder sipes. Each of the first shoulder sipes is provided with a chamfered portion over an entire lengthwise range from a first longitudinal edge to a first tread edge. Each of the chamfered portions includes a first chamfered portion defined between a shoulder center position and the first longitudinal edge and a second chamfered portion defined between the shoulder center position and the first tread edge. The second chamfered portion has a chamfer volume smaller than a chamfer volume of the first chamfered portion.