Pneumatic Tyre Shoulder Rib Groove Noise Reduction
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Solution Overview
Problem
Pneumatic vehicle tires with shoulder-side profile ribs contribute significantly to rolling noise while aiming to maintain good water drainage properties on wet ground.
Innovation Solution
The transverse grooves in the profile rib have a narrower outlet section than the main section, with one groove wall ending at the outlet section and the other continuing with a chamfer that is partially or fully chamfered, and a chamfer edge that runs without kinks, optimizing the cross-sectional area for water drainage and reducing rolling noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transverse grooves have large empty volume to improve water drainage, then water drainage properties are improved, but rolling noise increases
Solution Approach 1:
The transverse groove is segmented into three distinct sections: a first groove section, a second groove section, and an outlet section. This segmentation allows each section to serve different functions - the first two sections provide drainage capacity while the outlet section is optimized for noise reduction through its narrower width and chamfered configuration
Solution Approach 2:
Different sections of the transverse groove have different local properties. The first and second groove sections have larger width to maximize drainage, while the outlet section has reduced width and chamfered walls to minimize noise. This local differentiation resolves the contradiction by optimizing each region for its specific function
2Object-generated harmful factors
If transverse grooves are narrowed to reduce rolling noise, then rolling noise is reduced, but water drainage capacity decreases
Solution Approach 1:
The groove is divided into segments where the first and second groove sections maintain larger dimensions for drainage, while only the outlet section is narrowed. This ensures drainage capacity is preserved in the main groove body while noise is reduced at the outlet
Solution Approach 2:
The groove width is varied in the transverse dimension across different sections. By creating a three-dimensional groove structure with varying width along its length, the design achieves both large overall volume for drainage and narrow outlet for noise reduction
Data Source
Figure 1
Figure 2:II-II~3:III-III
Figure 4:IV-IV~5:V-V
AI summary
The invention relates to a vehicle pneumatic tire with a tread having at least one shoulder-side profile rib (1) bounded by a circumferential groove (2) and having an outer surface (1a) located at the periphery of the tread, wherein the profile rib (1) is provided with a plurality of transverse grooves (3) running parallel to each other and ending in front of the circumferential groove (2), each of which has two groove edges (4, 5) on the outer surface (1a) of the profile rib (1), two groove walls (7, 8), a main section (3a) and a trailing section (3c) adjoining the main section (3a) on the inside of the tread and extending to the outer surface (1a) of the profile rib (1).The outlet section (3c) is narrower than the main section (3a), wherein one groove wall (8) ends at the outlet section (3c) and the other groove wall (7) continues in the outlet section (3c), wherein the outlet section (3c) is bounded opposite the continued groove wall (7) by a flank (9) which is chamfered at least section by section to the outer surface (1a) of the profile rib (1) and therefore has a chamfer (9b) which is bounded on the outer surface (1a) of the profile rib (1) by a chamfer edge (4') which connects to the groove edge (4) of the groove wall (8) ending at the outlet section (3c).