Tread Profile Cylinder Segment Recess Noise Reduction
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Solution Overview
Problem
Pneumatic vehicle tires face challenges in achieving good dry performance properties while minimizing noise generation, as existing designs that improve handling and braking on dry roads often increase noise due to increased stiffness in the transition areas between tread block elements and the radially outer surface.
Innovation Solution
A tread profile design featuring circumferential grooves with edge regions and a central region, where the first flank has an inner extension area with a smaller angle of inclination and the second flank has a larger angle, forming a cylinder-segment-shaped bulge and recess respectively, which counteracts noise generation and maintains dry performance properties by ensuring point contact with the road surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transition between the profile block element flank and the radially outer surface is designed with a phase to improve dry performance properties, then handling and braking properties are improved, but the stiffness of the transition area is increased which promotes noise generation when the phase hits the road surface
Solution Approach 1:
The groove is divided into different zones with different flank angle characteristics: edge regions with larger angles (γ>α>β) for dry performance, and a central region with smaller angles for noise reduction. This local differentiation allows each zone to optimize for its specific function while resolving the overall contradiction.
Solution Approach 2:
The groove structure is segmented into multiple functional regions (edge regions and central region) with distinct geometric characteristics. This segmentation allows the tire to simultaneously achieve good dry performance in the edge regions and reduced noise generation in the central region, resolving the contradiction between these two performance aspects.
2Reliability
If the groove walls are designed with larger angles of inclination to improve dry performance, then handling and braking are improved, but the impact edge becomes harder which increases noise when hitting the road surface
Solution Approach 1:
Different sections of the groove walls have different angle characteristics tailored to their specific functions. The edge regions have larger angles (γ>α>β) optimized for dry performance, while the central region has smaller angles optimized for noise reduction, allowing local optimization without compromising overall performance.
Solution Approach 2:
The groove structure is divided into functional segments with distinct geometric properties. This segmentation enables the tire to achieve both good dry performance properties and reduced noise generation by assigning different geometric characteristics to different zones that contact the road surface at different times and under different conditions.
Data Source
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AI summary
The profile has tread bar rows aligned in a circumferential direction (U) of a tire of a vehicle, formed by tread elements (9) arranged behind each other in the circumferential direction and defined by peripheral grooves (6, 18) in an axial direction (A). Grooves (10) have two edge regions and a middle region extended between the peripheral grooves. Two edges form a cylinder segment-shaped projection and a cylinder segment-shaped recess of each tread element, respectively. Cylinder axes (Z) of the respective projection and recess run in a radial direction.