Directional Tire Sipe Layout for Axle-Specific Traction
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Solution Overview
Problem
Current directional tires do not exhibit significant differences in dry driving or braking traction when rotated in different directions, which limits their ability to optimize performance based on the specific demands of front and rear axles in vehicles.
Innovation Solution
The method involves designing tires with circumferential tread elements that have sipe arrangements angled in the depth direction, allowing the tires to exhibit different performance characteristics when mounted and rotated in specific orientations, such as braking, dry driving traction, noise, wear, and snow traction, by varying the sipe presence on one half versus none on the other half of the tread element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If directional tires are designed with a preferred rolling direction to optimize front axle performance, then front axle traction and braking performance are improved, but the tires cannot be effectively used on rear axles with different performance requirements
Solution Approach 1:
The tread elements are designed with asymmetric sipe arrangements where one half of the tread element has sipes angled in a depth direction while the other half has no sipes. This asymmetric configuration creates different performance characteristics when the tire rolls in clockwise versus counterclockwise directions, enabling the same tire to provide optimized performance for both front axle (driving/braking) and rear axle (braking only) applications depending on mounting orientation
Solution Approach 2:
The patent inverts the conventional directional tire design by creating bidirectional capability through the asymmetric sipe arrangement. Instead of optimizing for a single rolling direction, the tire can be mounted and rotated in either direction to provide appropriate performance characteristics for different axle positions, effectively using the 'other way round' mounting approach to achieve versatility
2Reliability
If asymmetric tread patterns are used to optimize specific performance features like braking and traction, then performance in specific conditions is improved, but the tire structure becomes more complex
Solution Approach 1:
The asymmetric sipe arrangement applies local quality variation within each tread element, where only one half contains sipes while the other half remains solid. This localized modification to specific regions of the tread elements provides enhanced braking and traction performance without requiring complete redesign of the entire tread pattern, thus balancing performance improvement with structural simplicity
Data Source
AI summary
A method of mounting a tire on a vehicle includes providing a tire having a first side, a second side, and a circumferential tread disposed about the tire. The first side defines a first forward rotation direction and the second side defines a second forward rotation direction. The circumferential tread includes a plurality of tread elements, and at least one of the plurality of tread elements includes a sipe arrangement including a plurality of sipes that are angled in a depth direction of the tire. The plurality of sipes are disposed on a first half of the tread element and no sipes are disposed on a second half of the tread element. The sipe arrangement causes the tire to exhibit a first tire performance when the tire is mounted on the vehicle in the first orientation and rotated in the first forward rotation direction, and further causes the tire to exhibit a second tire performance when the tire is mounted on the vehicle in the second orientation and rotated in the second forward rotation direction. The method includes mounting the tire on the vehicle in the first orientation for driving the vehicle in a first set of conditions, and mounting the tire on the vehicle in the second orientation for driving the vehicle in a second set of conditions.