Tread Rib Groove Layout for Snow Traction and Drainage
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Solution Overview
Problem
There is a conflict between traction behavior on snow and drainage performance in pneumatic vehicle tires, where improving one property typically deteriorates the other, and existing designs struggle to maintain low tire-road noise.
Innovation Solution
The design incorporates incision-like grooves between blind grooves, which are shallower towards their end flanks, with a maximum depth that is larger than the blind grooves, and angled sections that form a sound barrier and enhance snow accumulation, while also improving water drainage by connecting to circumferential grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind grooves are used in the tread rib, then traction on snow is improved through snow compaction, but drainage performance deteriorates
Solution Approach 1:
The groove system is segmented into two distinct types: blind grooves for snow traction and through-going transverse grooves for drainage. This segmentation allows each groove type to specialize in its primary function without compromising the other, resolving the contradiction between snow traction and drainage performance
Solution Approach 2:
Different groove configurations are applied to different functional zones of the tread rib. Blind grooves are positioned to optimize snow compaction in specific areas, while transverse grooves are positioned to maximize water drainage in other areas, creating local quality variations that address both conflicting requirements
2Productivity
If transverse grooves run through the tread rib, then drainage performance is improved, but traction on snow deteriorates due to reduced snow accumulation
Solution Approach 1:
The patent merges two previously separate groove concepts (blind grooves and through-going transverse grooves) into a single integrated tread rib design. This combination allows the rib to simultaneously provide both snow traction through blind grooves and water drainage through transverse grooves, eliminating the need to choose one function over the other
3Productivity
If deep grooves are used to improve drainage, then water drainage capacity is improved, but tire-road noise increases
Solution Approach 1:
The groove depth is varied locally across different zones of the tread rib. Transverse grooves have sufficient depth for effective drainage, while blind grooves are shallower to minimize noise generation. This local differentiation of groove depth allows the system to optimize for both drainage capacity and noise reduction in their respective functional zones
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a vehicle pneumatic tire with a tread having at least one central profile rib (1) bounded on each side by a circumferential groove (2, 3), which is provided with first pocket grooves (4) opening into one circumferential groove (3) and with second pocket grooves (5) opening into the other circumferential groove (2), being offset in the circumferential direction from the first pocket grooves (4) and extending without overlap with them in the circumferential direction, wherein each pocket groove (4, 5) is bounded by two groove flanks (4a, 5a), a groove base (4b, 5b) and an end flank (4c, 5c) located inside the profile rib (1). The pocket grooves (4, 5) are connected to their respective end flanks (4c, 5c) at least by a base section (4bi, 5bi) on the inside of the rib (4b, 5b) adjoining the respective end flank (4c, 5c). End flanks (4c, 5c) are shallower and have their smallest depth (t1) in the area of the rib-inner base section (4bi, 5bi),wherein incision-like grooves (6) are provided, each running between a first bag groove (4) and a second bag groove (5), having a width (bR) of 0.4 mm to 4.0 mm and a maximum depth (tR) greater than the smallest depths (t1) of the bag grooves (4, 5), and each, viewed from above, being composed of three straight sections (6a, 6b, 6c) enclosing angles (µ) of 100° to 150° with each other.