Pneumatic Tire Shoulder Rib Zigzag Grooves
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Solution Overview
Problem
Pneumatic tires with rib patterns face challenges in maintaining traction performance and skid resistance while enhancing irregular wear resistance, as they tend to have lower traction and higher deformation compared to block patterns.
Innovation Solution
The tire features a tread surface with six to eight main grooves and various ribs, including shoulder ribs with zigzag first shallow grooves, inner mediate ribs with second shallow grooves, and center ribs with opposing wall surfaces, which enhance traction and skid resistance while reducing deformation through specific groove depths and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rib pattern is used to enhance irregular wear resistance, then irregular wear resistance is improved, but traction performance and skid resistance decrease
Solution Approach 1:
The patent applies different groove patterns to different regions of the rib pattern. Shoulder ribs have zigzag shallow grooves for lateral force dissipation, while center ribs have straight shallow grooves for traction. This localized differentiation allows each region to optimize for its specific functional requirements, resolving the contradiction between wear resistance and traction.
Solution Approach 2:
The rib pattern is segmented into multiple functional zones (shoulder ribs, outer mediate ribs, inner mediate ribs, center ribs) with distinct groove configurations. This segmentation allows independent optimization of each zone for its specific role, enabling the overall pattern to achieve both wear resistance and traction performance simultaneously.
2Reliability
If the rib pattern is used, then irregular wear resistance is improved, but rib deformation increases under high ground pressure
Solution Approach 1:
The patent specifies precise parameters for the shallow grooves including depth (10-40% of main groove depth), width ratios, and spacing. These parameter optimizations balance the need for flexibility (to reduce deformation) while maintaining structural integrity for wear resistance. The controlled deformation through parameter optimization resolves the contradiction.
3Reliability
If shoulder main grooves are made zigzag to enhance irregular wear resistance, then irregular wear resistance is improved, but traction performance decreases
Solution Approach 1:
The patent applies zigzag patterns specifically to shoulder main grooves where lateral forces dominate, while center main grooves use straight patterns where traction is critical. This localized application of different groove geometries allows each region to optimize for its primary function, resolving the contradiction between wear resistance and traction.
Data Source
AI summary
A pneumatic tire has a first shallow groove extending in a zigzag manner at the shoulder rib and second shallow grooves extending in the tire width direction and arranged at regular intervals in the tire circumferential direction at inner mediate ribs and center rib or ribs. A wall of each section divided by the second shallow grooves includes a central wall surface extending from one end on an interior widthwise of a center main groove to an other end on an exterior widthwise of the center main groove, a first wall surface extending from the one end of the central wall surface, and a second wall surface extending from the other end of the central wall surface. The first wall surfaces of the inner mediate ribs and the first wall surfaces of the center rib or ribs are mutually opposed across the center main groove.