Pneumatic Tire Sipe Layout for Snow Traction and Dry Rigidity
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Solution Overview
Problem
Pneumatic tires face a trade-off between maintaining land rigidity for dry road performance and achieving traction on snowy surfaces, as sipes that enhance traction on snow reduce land rigidity, leading to compromised braking and handling on dry roads.
Innovation Solution
The tire design includes first and second shoulder lands with specific sipe configurations, where center sipes are contiguous with both ends and shoulder sipes are separated from one end, allowing for increased traction on snow while maintaining rigidity on dry roads by controlling sipe lengths and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sipes are made to be contiguous with both ends of the land to increase traction on snowy surfaces, then traction performance on snow is improved, but land rigidity is reduced leading to compromised braking and handling performance on dry roads
Solution Approach 1:
The patent applies different sipe configurations to different regions of the tread. Center land sipes are contiguous with both ends to maximize snow traction, while shoulder land sipes are separated from one end to maintain land rigidity. This local differentiation allows each region to optimize for its specific function - center for snow traction, shoulders for structural stability and dry road performance.
Solution Approach 2:
The tread is segmented into multiple lands (center land and shoulder lands) with distinct sipe arrangements. This segmentation allows independent optimization of sipe configurations in different regions, enabling the tire to achieve both high snow traction through center land sipes and maintain adequate rigidity through shoulder land sipes that are separated from one end.
2Reliability
If sipes are made wider through deformation to enhance edges for snow traction, then traction on snowy road surfaces is improved, but rigidity at the land is reduced
Solution Approach 1:
Different sipe designs are implemented in different lands to address local requirements. Center land sipes are designed to deform and widen for maximum snow contact, while shoulder land sipes are configured with separations to maintain structural integrity and rigidity, preventing excessive deformation that would compromise land stability.
Data Source
AI summary
In a pneumatic tire, a center land comprises a plurality of center sipes, all of the center sipes are respectively contiguous with a first end and a second end in a tire axial direction of the center land, a first shoulder land comprises a plurality of first shoulder sipes, and all of the first shoulder sipes are contiguous with an outer end in the tire axial direction of the first shoulder land but are separated from an inner end in the tire axial direction of the first shoulder land.