Commercial Vehicle Tire Recesses for Traction and Stability
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Solution Overview
Problem
Commercial vehicle tires with circumferential profile ribs and wide grooves experience low traction due to the absence of engagement edges.
Innovation Solution
Forming recesses on the rib flank of the circumferential groove with L-shaped boundary surfaces and a bottom surface, where the boundary surfaces extend in the radial direction and the bottom surface is at a low depth, creating effective traction edges and stabilization while preventing tears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wide circumferential grooves are used to separate profile ribs in shoulder regions, then the tire structure allows for simplified tread design and manufacturing, but traction performance deteriorates due to absence of engagement edges
Solution Approach 1:
The patent applies local quality by creating recesses with specific geometric features (first and second boundary surfaces meeting at angles, bottom surface at controlled depth) only in the shoulder regions where profile ribs are located. This localized structural modification provides engagement edges precisely where needed for traction, while maintaining the simplicity of wide circumferential grooves in other areas. The recesses are positioned to create effective engagement edges without complicating the overall tread design.
2Reliability
If recesses are formed deeply in the rib flank to create traction edges, then traction performance improves, but the risk of tear occurrence increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the geometric parameters of the recesses: the first boundary surface runs at angles of 1° to 10° to the axial direction, the second boundary surface runs at angles of 90° to 120° to the first boundary surface, and the bottom surface is positioned at depths of 15% to 30% of the profile depth. These controlled parameter ranges create effective engagement edges for traction while preventing excessive stress concentration that would lead to tears.
Solution Approach 2:
The patent applies beforehand cushioning by providing the bottom surface at a controlled depth (15%-30% of profile depth) and the second boundary surface at protective angles (90°-120° to the first boundary surface). This structural design anticipates and prevents tear propagation by creating a geometry that distributes stress away from critical points, cushioning against the harmful effect of potential tears before they can compromise the entire profile rib.
3Strength
If the rib flank is made stable and resistant to tears, then structural integrity improves, but traction edge effectiveness may be reduced
Solution Approach 1:
The patent applies local quality by creating a narrow transition surface (width of 1.0 mm to 3.0 mm) in the specific region where the rib flank meets the second boundary surface. This localized structural feature provides enhanced stability and tear resistance at the critical transition zone without affecting the sharpness and effectiveness of the engagement edges formed by the first boundary surface and bottom surface.
Solution Approach 2:
The patent applies segmentation by dividing the rib flank structure into distinct functional zones: the first boundary surface creating engagement edges, the second boundary surface providing stability, the bottom surface preventing tear propagation, and the narrow transition surface reinforcing the critical junction. This segmented approach allows each zone to optimize its specific function without compromising the others.
Data Source
AI summary
A pneumatic vehicle tire, in particular commercial vehicle tire, having a tread having in each case one shoulder-side profile rib (1) which is separated in each case from a central tread portion (3) by a wide circumferential groove (2) which is made to profile depth (T) and which runs around rectilinearly in the circumferential direction, wherein the circumferential groove (2) has a rounded groove base (8) and is delimited at the profile rib (1) by a rib flank (6). Recesses (9) are formed on the rib flank (6) of the circumferential groove (3) at the profile rib periphery, which recesses have, in the direction of extent of the circumferential groove (2), a length of extent (1) of 70% to 90% of the profile depth (T), at most of 30 mm, and in each case have, as seen in plan view, boundary surfaces (10a, 10b) which run toward one another in an L shape and extend in the radial direction, and a bottom surface (11), wherein, as seen in plan view, the one first boundary surface (10a) runs into the profile rib (1) at an angle (β) of up to 35° to the axial direction, and the second boundary surface (10b) runs at an angle (β2) of 90° to 125° to the first-mentioned boundary surface (10a), and wherein bottom surface (11) is situated at a depth (t) of 15% to 25% of the profile depth (T).