Tire Tread Sipe Segmentation for Snow and Dry Grip
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Solution Overview
Problem
Existing tire tread profiles with fine incisions face a trade-off between achieving good snow grip and maintaining dry grip properties, as deep and long incisions for snow grip reduce tread block rigidity and make it difficult to adjust the opening angle of the fine incisions, leading to compromised traction and braking performance.
Innovation Solution
A tread profile design featuring fine incisions formed from multiple extension sections with a trapezoidal oscillating course, allowing for adjustable opening angles and enhanced stiffness, which maintains effective gripping edges while preventing chaotic interlocking of fine incision walls, thereby optimizing both snow grip and dry grip performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deep and long fine incisions are formed in profile block elements to improve snow grip, then snow grip is improved, but tread block rigidity is reduced and dry grip properties deteriorate
Solution Approach 1:
The fine incision is segmented into multiple extension sections (first, second, third, fourth extension sections) arranged in an alternating sequence along the main extension line. This segmentation allows the incision to provide multiple gripping edges for snow grip while maintaining overall structural integrity of the tread block, thus improving snow grip without excessive loss of rigidity.
Solution Approach 2:
The extension sections are arranged asymmetrically with alternating patterns where first and third extension sections are spaced at different distances from one another. This asymmetric arrangement creates effective gripping edges in both circumferential and lateral directions while maintaining a balanced distribution of material to preserve tread block rigidity.
2Reliability
If deep and long fine incisions are formed to improve snow grip, then snow grip is improved, but it becomes difficult to adjust the opening angle of the fine incisions
Solution Approach 1:
The fine incision design with alternating extension sections creates a dynamic structure that can adapt its opening angle during tire operation. The spaced arrangement of extension sections allows the incision to open and close flexibly as the tire rotates through the contact patch, enabling the opening angle to adjust according to loading conditions while maintaining effective snow grip.
3Reliability
If fine incisions are formed with parallel extension sections to provide gripping edges, then effective gripping edges are created, but the fine incisions reduce tread block rigidity
Solution Approach 1:
The fine incision features local variations in geometry with alternating extension sections spaced at different distances. This creates localized gripping edges where needed (in first and third extension sections) while maintaining greater material continuity in other areas (second and fourth extension sections), thus providing effective grip performance while preserving overall tread block rigidity through strategic material distribution.
Data Source
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AI summary
The invention relates to a tread profile of a vehicle tyre having profile elements and having sipes (14) which, in the radially outer surface (21) and sectional planes which are parallel to a depth T1, in each case extend along a main extension line g substantially in the axial direction A of the vehicle tyre and are formed from a plurality of first (17), second (18), third (19) and fourth (20) extension sections. The first (17) and third (19) extension sections are in each case oriented parallel to the main extension line g and are arranged along the main extension line g in an alternating sequence one after the other. The first extension sections (17) and the third extension sections (19) are arranged spaced apart from one another both in the extension direction and also perpendicular to the extension direction. Along the extent of the sipe (16), starting from the beginning of the extension region as far as the end of the extension, in each case a second rectilinear extension section (18) connects the end of a first extension section (17) to the start of the subsequent third extension section (19) and a fourth extension section (10) connects the end of a third extension section (19) to the start of the subsequent first extension section (17). The sipe (16) is formed along the extension thereof by means of first (17), second (18), third (19) and fourth (20) extension sections into the sectional planes formed perpendicularly to the main extension line g in a first radially outer extension section in a rectilinear manner and is formed in an adjoining second extension section having a convexity directed to one side away from the radial.