Directional Pneumatic Tyre Tread Groove Design
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Solution Overview
Problem
Pneumatic vehicle tires with oblique grooves in a V-shape suffer from uneven wear and reduced water drainage capabilities, leading to increased rolling noise and the risk of aquaplaning on wet roads, while maintaining effective snow grip and driving characteristics on dry roads is a challenge.
Innovation Solution
The tire design features groove center lines closest to the equatorial plane forming angles of 90° up to 20°, with outer grooves deviating from 90° by 15° to 30°, having a depth of 40% to 60% of the tread depth and a width of 2.4 mm to 3.0 mm, and incisions with a constant width of 0.2 mm to 0.7 mm, which shorten water displacement distances and improve snow grip by allowing smooth water flow and snow accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If oblique grooves in V-shape are used to maintain elongated tread blocks for dry road performance, then driving characteristics on dry roads are maintained, but water drainage capacity is reduced leading to aquaplaning risk
Solution Approach 1:
The tread is segmented into multiple groove types: oblique grooves for dry road performance, circumferential grooves for water drainage, and radial grooves for additional drainage paths. This segmentation allows each groove type to perform its specialized function, resolving the contradiction between maintaining tread block integrity for dry roads and providing adequate water drainage channels.
Solution Approach 2:
Different groove configurations are applied to different regions of the tread. The circumferential grooves are positioned specifically to intercept water flow, while oblique grooves maintain tread block structure. This local differentiation allows the tread to exhibit both water drainage capability and dry road performance characteristics in their respective zones.
2Ease of operation
If elongated tread blocks are used for dry road stability, then driving characteristics on dry roads are improved, but wear uniformity deteriorates leading to increased rolling noise
Solution Approach 1:
The elongated tread blocks are further segmented by circumferential and radial grooves into smaller sub-blocks. This secondary segmentation prevents excessive wear concentration while maintaining the overall elongated block structure, thus preserving dry road performance while improving wear uniformity and reducing rolling noise.
3Strength
If narrow grooves are used to maintain tread block stiffness, then driving characteristics are maintained, but snow grip deteriorates
Solution Approach 1:
The groove width and depth are optimized locally: circumferential grooves have dimensions optimized for water drainage, while oblique grooves maintain tread block stiffness. This local optimization allows the tread to exhibit both structural rigidity for dry road performance and sufficient groove capacity for snow accumulation and grip.
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 water drainage, maintains even tread wear for improved driving characteristics on dry roads, and provides better snow grip and reduced rolling noise, making the tire suitable as an all-season tire.
Implementation Method 1
the grooves formed in the elongated profile blocks of the tread according to the invention enable good drainage of the elongated profile blocks, as the grooves advantageously shorten the water displacement paths
Implementation Method 2
When driving on snow-covered roads, snow can accumulate particularly well in the grooves formed between the diagonal treads, resulting in good snow-on-snow friction and thus improving snow grip
Data Source
Figure 1
Figure 2~4
AI summary
A pneumatic vehicle tyre having a tread which is of directional design and which has oblique channels (11), which run toward one another in a V-shaped fashion over the tread width, as main channels, which in each tread half delimit elongate profile blocks (3) which are arranged in succession in a circumferential direction and which extend as far as the tread edge. The elongate profile blocks (3) are each extended through by at least two grooves (4a, 4b) which run in a straight manner in plan view and which open into the oblique channels (1), wherein the grooves (4a, 4b) that extend in one tread half are inclined in the opposite direction, with respect to the tyre circumferential direction, in relation to the grooves (4a, 4b) extending in the other tread half, wherein those ends of the grooves (4a, 4b) which are situated at the outer side of the tread enter the ground contact patch first during forward travel, and wherein, in each tread half, the angle enclosed between the grooves (4a, 4b) and the circumferential direction decreases from groove (4a) to groove (4b) with increasing distance of the position thereof from the equatorial plane.