Chamfered Sipe Design for Tire Stability
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Solution Overview
Problem
Conventional pneumatic tires face a trade-off between steering stability on dry and wet road surfaces, where increasing sipes for improved wet surface stability reduces rib rigidity and worsens dry surface stability.
Innovation Solution
A pneumatic tire design featuring chamfered sipes with a non-chamfered region, where the chamfered portion is shallower than the sipe, and a profile line convex inward in the tire radial direction, maintaining contact area while enhancing drainage and groove volume, thereby improving stability on both surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of sipes are disposed in the tread portion to improve steering stability on wet road surfaces, then drainage properties are ensured and steering stability on wet road surfaces is improved, but the rigidity of the rib is reduced and steering stability on dry road surfaces is deteriorated
Solution Approach 1:
The sipe is designed with different local characteristics: a chamfered portion at the leading edge for drainage, a non-chamfered region in the middle for maintaining rib rigidity and edge effect, and another chamfered portion at the trailing edge. This local differentiation allows the sipe to provide wet surface stability through drainage while the non-chamfered region maintains the structural integrity and rigidity of the rib for dry surface performance.
2Reliability
If chamfered portions are formed in sipes to improve drainage effect, then steering stability on wet road surfaces is improved, but the area to be chamfered increases which reduces steering stability on dry road surfaces
Solution Approach 1:
The sipe is designed with different local characteristics: a chamfered portion at the leading edge for drainage, a non-chamfered region in the middle for maintaining rib rigidity and edge effect, and another chamfered portion at the trailing edge. This local differentiation allows the sipe to provide wet surface stability through drainage while the non-chamfered region maintains the structural integrity and rigidity of the rib for dry surface performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves improved steering stability on both dry and wet road surfaces by maximizing drainage and maintaining rib rigidity, with specific ratios of chamfered and non-chamfered areas optimizing performance without deteriorating dry surface stability.
Implementation Method 1
improving the drainage effect based on the chamfered portion and at the same time the non-chamfered region is capable of effectively removing the water film by the edge effect
Implementation Method 2
the rigidity of the rib is reduced, so there is a disadvantage that steering stability performance on a dry road surface is deteriorated
Data Source
AI summary
Provided is a pneumatic tire. A sipe includes, on each of a leading side edge and a trailing side edge, a chamfered portion and a non-chamfered region including no other chamfered portion. The maximum depth of the chamfered portion is shallower than the maximum depth of the sipe, and the sipe width is substantially constant. In a cross-sectional view, at least one chamfered portion includes a profile line that is convex inward in a tire radial direction with respect to a chamfer reference line connecting both ends of the chamfered portion; and a cross-sectional area of a chamfered region that is surrounded by the profile line, the sipe, and a tread contact surface of a tread portion is equal to or greater than a cross-sectional area of a reference region, the reference region being surrounded by the chamfer reference line, the sipe, and the tread contact surface.