Studded Car Tyre Tread Block Stiffness and Sipe Design
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Solution Overview
Problem
Studded tires face a conflict between traction and braking performance on snowy and icy surfaces due to the trade-off between the presence of sipes for snow grip and the stiffness needed for stud effectiveness on ice, where increasing sipes for snow traction reduces stiffness and vice versa.
Innovation Solution
A studded tire design with blocks featuring a significant portion without sipes around the stud seat to enhance stiffness, combined with limited-depth sipes between the stud seat and deep sipes, optimizing stiffness distribution for improved grip on both surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread band is characterised by a high number of sipes and/or a significant extension thereof, then the ability of the tread band to capture snow is improved, but the stiffness of the tread band at the studs is reduced
Solution Approach 1:
The patent applies local quality by creating distinct zones with different sipe characteristics: a first zone around the stud seat with no sipes to maintain stiffness, and a second zone away from the stud seat with reduced-depth sipes to capture snow. This spatial differentiation of structural properties resolves the contradiction between needing stiffness at the stud location and snow capture ability in other areas.
Solution Approach 2:
The tread band is segmented into multiple functional zones: blocks with stud seats, first portions without sipes around studs, and second portions with reduced-depth sipes. This segmentation allows different regions to fulfill conflicting requirements - the no-sipe portions provide stiffness while the reduced-depth sipe portions provide snow capture, eliminating the need to choose between the two extremes.
2Strength
If the dimension of the tread portion without sipes around the studs is significantly extended to maintain adequate stiffness, then the stiffness of the tread band is improved, but the number of sipes per block surface is reduced
Solution Approach 1:
The patent resolves the contradiction by adding a depth dimension to the sipe design. Instead of only varying the horizontal extent of no-sipe zones, the invention introduces reduced-depth sipes as a third dimension of control. This allows sipes to penetrate partially into the block - providing snow capture functionality - while their limited depth preserves more of the block's structural integrity and stiffness compared to full-depth sipes.
Data Source
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AI summary
A car tyre (1) is described, in particular a studdable car tyre equipped with a tread band provided with blocks that have deep sipes and seats to accommodate the studs, therefore suitable for use on snowy and/or icy surfaces. The blocks provided with the seats for the studs have a widely extended portion, adjacent to the seat for the studs, without sipes so as to stiffen the tread band at the same seat. The tyre produced is also equipped, again on the blocks provided with the seats for the studs, with a second portion provided with sipes equipped with at least one segment with limited depth interposed between the portion of the block without sipes and the remaining portion of the block provided with deep sipes.