Tyre Block Corner Design for Wet Traction
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Solution Overview
Problem
Conventional tires experience reduced frictional force and braking ability due to block deformation under tangential stresses, leading to partial block rising and reduced contact area, which affects traction and stability, especially on wet roads.
Innovation Solution
The tire design incorporates a connection surface between the lateral wall and tread surface that forms a corner, allowing for controlled deformation and maintaining a constant contact area, reducing localized overpressures and improving water evacuation, thereby enhancing traction and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the blocks are subjected to tangential stress during braking, then the front edge generates overpressure to press the block against the road surface, but the rear edge generates pressure decrease causing the block to rise and reduce contact area
Solution Approach 1:
The patent applies preliminary action by providing a chamfer (inclined plane) at the rear edge of the block before braking occurs. This pre-configured geometric feature prepares the block to gradually reduce the pressure decrease and prevent excessive rising during braking, thereby maintaining more stable contact area throughout the braking process.
2Stability of the object's composition
If wide and deep chamfers are provided to maintain contact area, then block rising is reduced, but the contact surface size and block rigidity are excessively reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chamfer dimensions within specific ranges: the chamfer angle is limited to 5°-15° and the chamfer length to 0.5-2mm. These optimized parameters allow the chamfer to sufficiently prevent block rising and maintain contact area stability, while avoiding excessive reduction in contact surface size and block rigidity that would occur with wider and deeper chamfers.
3Stability of the object's composition
If the lateral wall and tread surface are connected by an inclined plane chamfer, then block deformation is controlled, but the contact surface area is reduced and noise increases
Solution Approach 1:
The patent applies parameter changes by optimizing the chamfer geometry with specific angle (5°-15°) and length (0.5-2mm) parameters. This controlled chamfer design sufficiently manages block deformation during braking while minimizing the contact surface reduction and noise generation that would occur with more aggressive chamfer configurations.
Data Source
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AI summary
A tyre (1) for vehicle wheels, comprising a tread band (2) on which a radially external tread surface (3) and a plurality of recesses (9; 9a) that delimit a plurality of blocks (10, 10a; 100; 200; 300) are defined;each block comprises a tread surface portion (11) and a first lateral wall (12) that extends, at least in part, from a bottom (13) of one of the recesses towards the tread surface portion and is connected, at least for a section thereof, to the tread surface portion (11) by a connection surface (15) having an at least partially curvilinear profile; the connection surface (15) is joined to the first lateral wall along a contact line, at which the tangent plane of the first lateral wall and the tangent plane of the connection surface form an acute angle (a) of more than 20° such that a corner is defined between the connection surface (15) and the first lateral wall (12); furthermore, the connection surface (15) is joined to the tread surface (11) along a contact line in a substantially tangential manner.