Pneumatic Tire Tread Noise Reduction via Ramp-Shaped Base Elevations
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Solution Overview
Problem
Existing pneumatic vehicle tire designs with pitch length variation struggle to distribute frequencies evenly when tread blocks of different circumferential lengths follow each other, leading to non-uniform wear and noise issues, particularly when pitch sequences include immediate successions of blocks with significantly different lengths.
Innovation Solution
The introduction of ramp-shaped basic elevations in transverse grooves between tread blocks of different pitch lengths, which stiffen the shorter pitch blocks, allowing for varied tread block lengths without compromising wear patterns, by adjusting the angle and extension of these elevations to distribute noise frequencies across a broader band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If pitch sequences include immediate successions of blocks with significantly different lengths to distribute frequencies and reduce noise, then noise reduction is improved, but non-uniform wear occurs due to stiffness differences
Solution Approach 1:
The patent applies local quality by providing different base ridge configurations in different transverse grooves. Specifically, some transverse grooves have base ridges while others have no base ridges or different base ridge heights, creating localized stiffness variations that compensate for the stiffness differences between tread blocks of different circumferential lengths, thereby preventing non-uniform wear while maintaining noise reduction benefits
Solution Approach 2:
The patent changes the structural parameters of the base ridges (presence, absence, height, extent) in different transverse grooves to adjust the circumferential stiffness of individual tread blocks. This parameter variation allows the pitch sequence to include tread blocks with significantly different lengths without causing non-uniform wear, as the stiffness is locally adjusted to maintain balance
2Strength
If base ridges are extended along the entire transverse groove to stiffen tread blocks, then handling characteristics are improved, but wear uniformity deteriorates when pitch lengths vary significantly
Solution Approach 1:
The patent applies local quality by selectively providing base ridges in certain transverse grooves while omitting them or providing different configurations in other grooves. This localized approach allows specific tread blocks to be stiffened without over-stiffening all blocks, thereby maintaining handling characteristics while preventing non-uniform wear in pitch sequences with varying lengths
Solution Approach 2:
The patent segments the base ridge structure by providing different base ridge configurations in different transverse grooves rather than a uniform structure throughout. This segmentation allows the tire to have varied stiffness characteristics across different tread blocks, enabling the use of pitch sequences with significantly different lengths while maintaining both handling and wear uniformity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances noise reduction and wear uniformity by allowing for optimal pitch sequences with varied pitch lengths, including direct succession of longest and shortest pitch blocks, without incurring stiffness-related abrasion disadvantages.
Implementation Method 1
forming a basic elevation in each of the transverse grooves between profile blocks belonging to pitches of different pitch lengths, which, viewed in the circumferential direction, rises ramp-like towards the profile block belonging to the shorter pitch. The ramp-shaped base elevation stiffens the profile block with the smaller circumference
Data Source
Figure 1~2
AI summary
Vehicle pneumatic tire with a tread which has at least one row of tread blocks consisting of tread blocks and transverse grooves (2b) running between them, which is divided into at least two pitches (P1, P2, P3) having different pitch lengths according to a method of pitch length variation, the sequence of which over the tire circumference is according to a noise-optimized pitch sequence, wherein the circumferential lengths of the tread blocks of the tread block row vary with these within the different pitch lengths, wherein base elevations (4) are formed in transverse grooves (2b) of the tread block row, wherein a base elevation (4) is formed in those transverse grooves (2b) between tread blocks which belong to pitches (P1, P2, P3) of different pitch lengths, and wherein the base elevation (4), viewed in the circumferential direction, rises ramp-like towards the tread block belonging to the shorter pitch (P1, P2).