Waveform Sipe Tread Blocks for Tire Grip and Steering Stability
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Solution Overview
Problem
Existing pneumatic tires with waveform sipes fail to adequately improve steering stability and braking performance on various road conditions.
Innovation Solution
A pneumatic tire design featuring blocks with waveform sipes where the pitch increases and amplitude decreases from the block surface side to the block bottom side, enhancing block stiffness and traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If waveform sipes with constant pitch and amplitude are used, then the siping effect is uniform, but steering stability and braking performance are insufficient
Solution Approach 1:
The patent applies local quality by varying the pitch and amplitude of waveform sipes at different locations within the block. Specifically, the pitch increases and amplitude decreases from the block surface side to the block bottom side, creating different sipe characteristics in different regions to optimize both steering stability and braking performance simultaneously
Solution Approach 2:
The patent changes the geometric parameters of the waveform sipes (pitch and amplitude) to resolve the contradiction. By making the pitch increase and amplitude decrease from surface to bottom, the patent achieves improved steering stability and braking performance without requiring overly complex manufacturing processes
2Reliability
If waveform sipes with large amplitude are used, then traction on icy roads is improved, but block stiffness decreases
Solution Approach 1:
The patent applies local quality by creating different waveform characteristics at different depths. The larger amplitude is concentrated at the block surface side where traction is needed, while the smaller amplitude at the bottom maintains block stiffness. This spatial variation allows simultaneous optimization of traction and structural integrity
Solution Approach 2:
The patent resolves the contradiction by adding a depth dimension to the sipe design. Instead of using uniform amplitude throughout, the amplitude varies through the depth of the block, with larger amplitude at the surface for traction and smaller amplitude at the bottom for stiffness maintenance
Data Source
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AI summary
Provided is a pneumatic tire (10) having a tread (20) including a block (30) in which a waveform sipe (41) is formed. The waveform sipe (41) is formed such that the pitch (P) increases and the amplitude (A) decreases from a block surface side to a block bottom side. The pitch (P) increases towards end sides the block (30) with respect to a center of the block (30) in a tire axial direction (W).