Stepped Sidewall Tire Tread Blocks Reduce Wear
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Solution Overview
Problem
Tire treads experience uneven wear and are prone to stone trapping, leading to damage and reduced durability, especially in heavy load automotive tires.
Innovation Solution
The tire tread features a pattern with blocks delimited by grooves of both circumferential and transverse orientation, where at least 20% of the blocks have irregularly shaped steps on their leading faces, with upper and front faces forming angles greater than 5°, reducing heel-and-toe wear and stone entrapment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional smooth block sidewalls are used in tire treads, then the structure is simple and easy to manufacture, but heel-and-tow wear occurs causing uneven wear and reduced durability
Solution Approach 1:
The block sidewall is segmented into multiple levels with different heights, creating a stepped configuration. This segmentation allows the tread to better accommodate wear patterns while maintaining structural integrity, directly addressing the heel-and-tow wear problem by distributing stress across multiple levels rather than a single uniform surface.
Solution Approach 2:
Different portions of the block sidewall are given different heights and orientations to match the local wear patterns and functional requirements. The stepped configuration provides varying heights at different locations, allowing each local area to optimize for its specific function - leading edges for traction and trailing edges for wear resistance.
2Reliability
If conventional smooth block sidewalls are used in tire treads, then manufacturing is simple, but stones easily lodge in grooves causing damage and tears
Solution Approach 1:
The sidewall is divided into multiple stepped levels that create a more complex groove structure. This segmentation prevents stones from easily lodging in single deep grooves by creating multiple shallower levels, reducing the risk of stone-induced damage and tears while maintaining the groove's ability to channel water and debris.
Solution Approach 2:
The sidewall transitions from a two-dimensional smooth surface to a three-dimensional stepped structure with varying heights. This dimensional change creates multiple levels that stones must navigate, making it harder for them to become trapped and cause damage, while still maintaining effective water and debris channeling capabilities.
3Ease of operation
If blocks have multiple transverse faces with steps, then traction is improved and wear is reduced, but the number of manufacturing operations increases
Solution Approach 1:
The stepped sidewall configuration is pre-formed during the tire molding process rather than being added through subsequent operations. By incorporating the multi-level structure into the initial mold design, the complex geometry is created in a single casting operation, avoiding the need for multiple separate manufacturing steps while achieving improved traction and wear resistance.
Solution Approach 2:
The stepped sidewall structure serves multiple functions simultaneously - it provides enhanced traction through increased surface area and varied contact points, reduces wear by distributing stress across multiple levels, and prevents stone lodging through its complex geometry. This multi-functionality is achieved through a single integrated structural design rather than separate components requiring multiple operations.
Data Source
AI summary
A tire includes a tread band having a tread pattern defined by a plurality of grooves of substantially circumferential orientation and by a plurality of grooves of substantially transverse orientation, which grooves delimit a plurality of rubber blocks arranged in a plurality of rows of substantially circumferential orientation, each of the blocks being delimited by a contact face and at least three side faces, wherein at least some of the blocks include at least one side face of substantially transverse orientation provided with at least one irregularly shaped step having an upper face and a front face.