Pneumatic Tire Tread Layout Balancing Drainage and Tread Rigidity
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Solution Overview
Problem
Pneumatic tires face a trade-off between steering stability on dry and wet road surfaces due to the number of lug grooves affecting tread rigidity and drainage performance, leading to inconsistent performance and increased pattern noise.
Innovation Solution
A pneumatic tire design featuring inner and outer main grooves, continuous land portions, and first sipes without lug grooves, with chamfered edges and sipe configurations that enhance drainage and reduce noise, improving steering stability on both dry and wet surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lug grooves in the tread portion is increased, then drainage performance is improved, but tread rigidity is degraded
Solution Approach 1:
The patent divides the drainage function into two separate components: lug grooves for primary water evacuation and sipes for secondary water channeling. This segmentation allows each component to be optimized independently - lug grooves can be reduced in number to maintain rigidity while sipes are added to compensate for drainage function, resolving the contradiction between drainage performance and tread rigidity.
Solution Approach 2:
The patent applies different groove configurations to different regions of the tread. Sipes are specifically added in land portions where lug grooves would otherwise be present, creating local variations in drainage capability. This allows drainage performance to be maintained in specific high-water-risk areas without uniformly reducing tread rigidity across the entire tread portion.
2Strength
If the number of lug grooves in the tread portion is reduced, then tread rigidity is improved, but drainage performance is degraded
Solution Approach 1:
The patent merges the drainage functions of lug grooves and sipes into a coordinated system. Sipes are positioned to work in conjunction with reduced lug grooves, creating a multi-level drainage network that compensates for the reduced number of lug grooves while maintaining overall drainage performance and improving tread rigidity.
Solution Approach 2:
The patent adds sipes as an additional dimensional element to the tread pattern geometry. By introducing these fine grooves that extend in different directions from the main lug grooves, the patent creates a three-dimensional drainage network that enhances water evacuation capability without requiring increased lug groove density, thus maintaining rigidity.
3Reliability
If lug grooves are provided in the land portions, then drainage performance is improved, but pattern noise is increased
Solution Approach 1:
The patent changes the geometric parameters of the drainage features by introducing sipes with specific width, depth, and spacing characteristics. These parameter adjustments allow the sipes to provide effective drainage while their smaller scale and different configuration reduce the impact on pattern noise compared to traditional lug grooves.
Data Source
AI summary
A tread pattern of a pneumatic tire includes one center continuous land portion and two intermediate continuous land portions that are divided by four circumferential main grooves and that are not provided with lug grooves. Edges on both sides of one center main groove include groove chamfered portions having a chamfered width changing in the circumferential direction in a zigzag shape. In the regions of the intermediate continuous land portions, first sipes extending inward in the lateral direction from shoulder main grooves of the main grooves, which are positioned on outer sides in the lateral direction, are provided. The first sipes each include a sipe main body portion having a constant distance between sipe wall surfaces on a sipe bottom side and a sipe chamfered portion inclined so that the sipe wall surfaces are open toward the tread surface.