Tire tread stud arrangement for pin retention
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Solution Overview
Problem
Conventional studded snow tires experience significant stud pin drop when used on concrete or asphalt roads due to forces from driving, braking, and cornering, leading to reduced traction, durability, and wear issues.
Innovation Solution
The tire tread incorporates a configuration of studs with varying radial depths and tip sizes, including first studs with cylindrical tips, second studs with spherical tips, and third studs with specific orientations and recessed surfaces, ensuring secure embedding and gradual wear-based protrusion to maintain contact with the road surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stud pins are embedded in the tread portion to grip icy or snowy road surfaces, then traction on snow and ice is improved, but stud pins are dislodged on concrete or asphalt road surfaces
Solution Approach 1:
The stud arrangement is segmented into multiple groups with different embedding depths. First studs are embedded at a first depth, second studs at a second depth greater than the first, and third studs at a third depth greater than the second. This segmentation allows different studs to serve different functions: deeper studs remain embedded on hard surfaces while shallower studs protrude to provide traction on snow and ice.
Solution Approach 2:
Different studs are given different local qualities through varying embedding depths and orientations. The first studs have a first orientation, second studs have a second orientation different from the first, and third studs have a third orientation different from both. This local differentiation allows the stud arrangement to adapt to different road conditions in different locations.
2Stability of the object's composition
If stud pins are tightly embedded to prevent falling out during braking and driving, then stud pin retention is improved, but traction performance on various road surfaces deteriorates
Solution Approach 1:
The stud arrangement is designed to be dynamic rather than static. As the tread wears, different studs become exposed at different rates due to their different embedding depths. This creates a dynamic system where the effective stud configuration changes over time, maintaining optimal traction performance throughout the tire's service life.
Solution Approach 2:
The multi-depth stud arrangement is prepared in advance to anticipate wear. The varying embedding depths are predetermined so that as the tread wears down, studs at different depths will progressively become exposed, ensuring continuous traction capability without requiring adjustment or intervention.
3Ease of manufacture
If all studs are embedded at the same depth, then manufacturing simplicity is maintained, but gradual wear-based protrusion cannot occur to maintain contact
Solution Approach 1:
The patent applies local quality by varying the embedding depth of different studs within the same tread portion. First studs are embedded at a first depth, second studs at a second depth greater than the first, and third studs at a third depth greater than the second. This localized differentiation ensures that as the tread wears, studs become exposed in a controlled sequence, maintaining continuous road contact.
Data Source
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AI summary
A tire tread (18, 118) and a tire (10) with such a tread (18, 118) is disclosed. The tread (18, 118) has an arrangement (21, 22) of studs (50, 150) inserted into a tread portion (18, 118) thereof. The arrangement (21, 22) comprises at least one or a plurality of first studs protruding from the unworn tread portion for contacting a surface and at least one or a plurality of second studs embedded or inserted in the tread portion (18, 118). The at least one or the plurality of second studs is embedded or inserted in the tread portion (18, 118) such that (i) the radially outermost surfaces of the second studs are recessed in the radial direction of the tire (10) versus the radially outermost surfaces of the first studs and/or that (ii) only the at least one or only the plurality of first studs protrude from the unworn tread portion.