Pneumatic Tyre Groove Chamfers Stone Ejection
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Solution Overview
Problem
Pneumatic vehicle tires with stone ejector projections face challenges in water drainage due to reduced groove volume, which affects their performance on wet surfaces and increases the likelihood of stones getting stuck.
Innovation Solution
Chamfering the groove edges around free-standing projections to increase the groove volume, enhance water absorption, and improve traction, while maintaining the stone-ejecting effectiveness by ensuring the chamfers project beyond the projections in opposite directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If free-standing projections are formed at the groove bottom to eject stones, then stone ejection effectiveness is improved, but groove volume is reduced which worsens water drainage properties
Solution Approach 1:
The groove is segmented into multiple functional zones: the groove base with free-standing projections for stone ejection, and chamfered groove edges for water drainage. This segmentation allows each zone to perform its specific function optimally without compromising the other.
Solution Approach 2:
The invention adds chamfers to the groove edges, introducing a new dimensional element (the chamfered surface) that provides additional water drainage capacity without interfering with the vertical projections at the groove base. This dimensional addition resolves the volume conflict.
2Reliability
If free-standing projections are formed at the groove bottom to eject stones, then stone ejection effectiveness is improved, but likelihood of stones getting stuck increases due to reduced groove cross-section
Solution Approach 1:
The groove structure is divided into distinct functional areas: the groove base with projections for active stone ejection, and the chamfered edges that provide smooth transition zones preventing stone entrapment. This segmentation eliminates the harmful effect of stones getting stuck while preserving ejection effectiveness.
Solution Approach 2:
The chamfered groove edges act as intermediary elements between the stone and the groove base projections. They provide a gradual transition that prevents stones from getting abruptly trapped, mediating the interaction between stones and the groove structure.
3Volume of stationary object
If groove volume is increased to improve water drainage, then water drainage properties are improved, but stone ejection effectiveness is reduced due to smaller projection size
Solution Approach 1:
The groove is segmented into volume-providing chamfered edges for water drainage and compact projection structures for stone ejection. This segmentation allows the groove to have sufficient overall volume for drainage while maintaining small, effective projections for stone ejection.
Solution Approach 2:
Different parts of the groove have different qualities: the groove edges are chamfered to provide water drainage volume, while the groove base maintains compact projections for effective stone ejection. Each local area is optimized for its specific function.
Data Source
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AI summary
The invention relates to a vehicle pneumatic tire with a tread featuring profile positives, such as profile bands or profile block rows, which are arranged around the tread circumference according to a pitch sequence of at least two pitches (L, M, K) with different circumferential lengths (lL, lM, lK), and with at least one circumferential groove (2) designed to a tread depth (T1) with a groove base (2a), groove flanks (2b) and groove edges (2c), wherein a plurality of spaced-apart, freestanding projections (6) are formed on the groove base (2a), which have a height (hi) of 10% to 30% of the tread depth (T1), a width (b1) of 25% to 40% of the width (B1) of the circumferential groove (2) and an extension length (l1) of 15% to 40% of the circumferential length (lL, lM, lK) of the respective pitch (L, M, K).Laterally, on each freestanding projection (6), both groove edges (2c) of the circumferential groove (2) are chamfered in such a way that the groove flanks (2b) have chamfers (2'b) which each project beyond the freestanding projection (6) in the circumferential direction at least on one side.