Pneumatic Tyre Shoulder Blocks with Dual Base Elevations
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Solution Overview
Problem
Pneumatic vehicle tires with transverse grooves and base elevations often experience uneven tread wear on the shoulder side, leading to reduced handling properties and increased noise due to 'air pumping' during rolling.
Innovation Solution
The tire design incorporates two base elevations in each lateral groove, one on the circumferential groove and another near the edge of the ground contact area, which support shoulder blocks and restrict their mobility, ensuring even wear and reducing noise by deflecting airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a single raised base section is provided in each transverse groove to increase circumferential stiffness, then handling characteristics during cornering are improved, but uneven wear of the shoulder blocks occurs
Solution Approach 1:
The single raised base section is divided into two separate raised base sections within each transverse groove. This segmentation allows each base section to independently support adjacent shoulder blocks, distributing the stiffness-enhancing function across multiple locations to prevent localized uneven wear while maintaining overall circumferential stiffness for improved handling characteristics.
Solution Approach 2:
The two raised base sections are positioned at different locations within each transverse groove to provide locally optimized support. One base section supports shoulder blocks at one location while the other supports blocks at a different location, ensuring uniform wear distribution across the entire shoulder block row while maintaining circumferential stiffness where needed for cornering stability.
2Reliability
If transverse grooves are provided in shoulder-side profile blocks to evacuate water, then water evacuation capability is improved, but air pumping noise increases during rolling
Solution Approach 1:
The raised base sections within the transverse grooves convert the harmful air pumping effect into a beneficial turbulent flow pattern. By forcing air to flow around and over the raised bases, the design creates turbulence that suppresses the pumping effect and reduces noise emissions, while the grooves themselves continue to effectively evacuate water from the contact patch.
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 prevents uneven tread wear, enhances braking stability, reduces noise emissions, and improves handling by maintaining circumferential rigidity and deflecting airflow, thus addressing the issues of uneven wear and noise in existing tire designs.
Implementation Method 1
These two base elevations optimally support the shoulder blocks against each other and ensure uniform wear of the shoulder blocks. Since the overall circumferential stiffness of the shoulder-side profile block row is increased by the two base elevations, the circumferential movement of the shoulder blocks is also restricted to such an extent that they bend less during braking
Implementation Method 2
the raised bases deflect and swirl the air forced through the transverse grooves by the radial compression of the shoulder blocks during rolling on the surface. This creates a turbulent airflow, suppressing air pumping and thus preventing additional noise emission beyond the rolling noise
Implementation Method 3
The inclined flank surfaces provide optimal support for the raised bases, contributing to their stiffening effect
Data Source
Figure 1~2
AI summary
Radial-type pneumatic tire for vehicles with a tread having at least one shoulder-side row of profile blocks (1), which is provided over its circumferential extent with a plurality of transverse grooves (3) which divide the row of profile blocks (1) into shoulder blocks (1c), open into a circumferential groove on the inside of the tread and extend beyond the ground contact area of the tread, wherein within the ground contact area of the tread having a width (B) a base elevation (4) is formed in each transverse groove (3) at the circumferential groove (2), which connects successive shoulder blocks (1c) to one another in the circumferential direction, characterized in that a second base elevation (5) is formed in each transverse groove (3).