Pneumatic Tire Sipe Chamfering for Wet and Dry Stability
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Solution Overview
Problem
Conventional pneumatic tires face challenges in achieving simultaneous improvement in steering stability on dry and wet road surfaces due to the trade-off between sipe design for drainage and rigidity, which affects snow performance and steering stability on wet roads.
Innovation Solution
A pneumatic tire design featuring a sipe with chamfered portions on its leading and trailing edges, where the chamfered portions are shorter than the sipe length, and a non-chamfered region is present facing each chamfered portion, with at least one chamfered portion having an outer edge profile line not parallel to the sipe ridge line, optimizing drainage and edge effects for improved steering stability on wet roads while maintaining dry road stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of sipes are arranged in the tread portion to improve steering stability on wet road surfaces, then drainage properties are improved, but the rigidity of the rib is reduced, deteriorating steering stability on dry road surfaces
Solution Approach 1:
The sipe is designed with locally differentiated properties: chamfered portions at the leading and trailing edges for drainage and edge effects, and a non-chamfered middle portion for maintaining rigidity. This local quality differentiation allows the sipe to provide wet road performance while preserving rib stiffness for dry road stability.
Solution Approach 2:
The sipe is segmented into three distinct regions along its length: leading edge chamfered portion, middle non-chamfered portion, and trailing edge chamfered portion. This segmentation enables each region to fulfill its specific function independently, resolving the contradiction between drainage needs and rigidity requirements.
2Reliability
If groove volume is increased to improve snow performance, then snow traction is enhanced, but the block rigidity is lowered, deteriorating steering stability on wet road surfaces
Solution Approach 1:
The chamfered portions are positioned only at the edges of the sipe rather than throughout the entire groove volume. This local application of chamfering provides the necessary edge effects for snow performance while preserving the rigidity of the main block structure, avoiding the trade-off between snow traction and wet road stability.
3Reliability
If chamfered portions are made large to improve drainage effect, then steering stability on wet road surfaces is improved, but the area to be chamfered increases, deteriorating steering stability on dry road surfaces
Solution Approach 1:
Instead of chamfering the entire sipe length, only the leading and trailing edges are chamfered with controlled dimensions. This partial action provides sufficient drainage and edge effects for wet road performance while minimizing the impact on dry road stability, achieving the optimal balance between the two conditions.
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
This design enhances steering stability on both dry and wet road surfaces by maximizing the beneficial effects of chamfered and non-chamfered regions, achieving well-balanced performance improvements in steering stability and snow traction.
Implementation Method 1
the non-chamfered region is capable of effectively removing the water film by the edge effect
Implementation Method 2
the non-chamfered region is capable of effectively removing the water film by the edge effect
Data Source
AI summary
A pneumatic tire includes a plurality of main grooves extending in a tire circumferential direction in a tread portion; and a sipe extending in a tire width direction in a rib defined by the plurality of main grooves, the sipe including a leading side edge and a trailing side edge, a chamfered portion shorter than a sipe length of the sipe being formed in each of the leading side edge and the trailing side edge, a non-chamfered region including no other chamfered portion being present in a part facing each chamfered portion of the sipe, and, in a plan view of the tread portion, at least one of the chamfered portions including an outer edge profile line not parallel to a ridge line of the sipe.