Tire Sipe Wave Geometry for Snow Grip Without Block Weakening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The presence of sipes in tire blocks weakens the structure, leading to reduced stiffness and increased deformation under external stresses, particularly tangential stresses, which affects the contact area and friction force on snowy and icy roads.
Innovation Solution
A sipe configuration with specific geometric features, including rectilinear or slightly curvilinear segments and a single-wave portion, is designed to effectively oppose the sliding of block portions, enhancing stiffness and maintaining contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sipes are formed on the blocks of the tread band, then the grip on snowy and icy roads is improved, but the structure of the block is weakened and stiffness is reduced
Solution Approach 1:
The sipe is divided into multiple segments (first segment, second segment, third segment) with different inclinations, creating a segmented structure that provides grip enhancement while distributing structural stress across multiple smaller features rather than a single deep cut
Solution Approach 2:
The sipe configuration transitions from simple linear cuts to three-dimensional undulating structures with varying inclinations and depths, adding vertical and angular dimensions to the sipe geometry to simultaneously achieve grip improvement and structural reinforcement
2Reliability
If sipes extend from the tread surface towards the inside of the block, then additional gripping elements are provided, but the block becomes more prone to deformation under tangential stresses
Solution Approach 1:
The sipe structure is designed with dynamic undulating features that can adapt to deformation forces, where the varying inclination angles allow the sipe walls to flex and redistribute stresses rather than creating rigid stress concentration points
Solution Approach 2:
The sipe creates a composite structure within the block material, where the alternating pattern of sipe walls and solid rubber creates a layered composite effect that enhances both grip surface area and structural integrity through the interaction between different material regions
3Reliability
If multiple sipes are formed on each block, then the gripping elements are increased, but the manufacturing complexity increases
Solution Approach 1:
The sipe configuration applies different inclinations and geometries to different segments of the sipe structure, with each segment optimized for its local function (entry, middle, exit regions), allowing complex performance requirements to be met through localized geometric variations rather than overall complexity
Solution Approach 2:
The sipe design utilizes systematic parameter variations (inclination angles, segment lengths, depths) along the sipe progression to achieve complex functional requirements, where controlled changes in geometric parameters create the desired performance without requiring complex manufacturing processes
Data Source
AI summary
A tyre includes a plurality of blocks which are defined on a tread band and at least one first sipe which is formed on each block. The first sipe extends in a first longitudinal direction and includes a first linear portion which substantially extends along the first longitudinal direction, a single-wave portion which extends in continuation of the first linear portion, and a second linear portion which extends in continuation of the single-wave portion. The single-wave portion includes a first segment which extends from the first linear portion as far as a first peak, a second segment which extends from the first peak as far as an opposite second peak and a third segment which extends from the second peak as far as the second linear portion. The angle of inclination of second segment is greater than that of the first segment and the third segment.