Pneumatic Tire Asymmetric V-Shaped Sipe Rigidity
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Solution Overview
Problem
Existing pneumatic tire tread patterns suffer from reduced steering stability due to deformation during cornering, particularly in the outside land region, where the apex of v-shaped sipes is positioned on the tire-equator side, leading to insufficient rigidity.
Innovation Solution
A pneumatic tire design with v-shaped sipes where the apex is positioned on the outside-tread-edge side of the widthwise center, combined with specific depth and angle configurations for the oblique segments, and additional sipes and grooves to enhance rigidity and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the apex of v-shaped sipes is positioned on the tire-equator side or axially inside, then the tread pattern follows conventional design, but the outside land region deforms easily during cornering reducing steering stability
Solution Approach 1:
The patent applies asymmetry by positioning the apex of the v-shaped sipe on the outside-tread-edge side rather than at the center or inside, creating an asymmetric configuration that strategically reinforces the outside land region. This asymmetric placement increases apparent rigidity where it is most needed during cornering, directly addressing the deformation issue while maintaining the v-shaped sipe structure.
Solution Approach 2:
The patent implements local quality by making the first oblique segment deeper than the second oblique segment, creating a depth gradient that provides localized reinforcement. The deeper first oblique segment on the inside-tread-edge side of the apex creates enhanced rigidity in the outside land region, while the shallower second oblique segment maintains flexibility elsewhere in the tread pattern.
2Stability of the object's composition
If the first oblique segment and second oblique segment have equal depth, then the v-shaped sipe is symmetric, but the outside land region lacks sufficient rigidity to prevent deformation
Solution Approach 1:
The patent applies local quality by creating a depth gradient in the v-shaped sipe where the first oblique segment has maximum depth and the second oblique segment has smaller maximum depth. This non-uniform depth configuration locally reinforces the outside land region to increase apparent rigidity, while maintaining a relatively simple overall sipe structure that is easy to manufacture.
Data Source
AI summary
A pneumatic tire whose position when mounted on a vehicle is specified so that the tread portion 2 has an outside tread edge Te1 and an inside tread edge Te2. The tread portion 2 comprises an outside land region 4A provided with first sipes 10 extending across the entire width of the outside land region. The first sipe 10 comprises a v-shaped portion 13 formed by a first oblique segment 11 and a second oblique segment 12. The v-shaped portion 13 has an apex 15 located on the outside-tread-edge side of a widthwise center of the outside land region 4A. The maximum depth d2 in the second oblique segment 12 is smaller than the maximum depth d1 in the first oblique segment 11.