Snow Sipe Tread Block Structure for Grip and Stiffness
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Solution Overview
Problem
Modern all-season and winter tires lack advanced grip on snow, despite existing developments in tread block sipes.
Innovation Solution
A tire design featuring circumferential rows of shoulder and center tread blocks with elongated sipes, including parallel intermediate sipe portions and a joint sipe portion, providing improved snow grip and tread block stiffness through a balanced sipe structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sipes are used in tread blocks, then the tire provides basic snow grip, but the grip is insufficient and lacks advancement
Solution Approach 1:
The sipe is divided into multiple segments including a first sipe portion, second sipe portion, third sipe portion, and fourth sipe portion. These segmented portions work together to provide enhanced snow grip through multiple biting edges, resolving the contradiction between basic and advanced grip capability.
Solution Approach 2:
The sipe structure extends in multiple directions with portions extending in a first direction and other portions extending in a second direction transverse to the first direction. This multi-dimensional configuration provides advanced grip capability while maintaining reliability on snow.
2Reliability
If sipes are added to tread blocks to improve snow grip, then snow traction is enhanced, but tread block stiffness may be compromised
Solution Approach 1:
The sipe is segmented into multiple portions that can flex independently, allowing the tread block to maintain stiffness overall while providing flexible edges for snow traction. The segmented structure prevents excessive deformation while enhancing grip.
Solution Approach 2:
Different portions of the sipe have different configurations optimized for specific functions. The first sipe portion through fourth sipe portion have distinct orientations and shapes that provide localized properties for both stiffness maintenance and snow biting capability.
3Reliability
If multiple sipe portions are configured in different directions, then snow biting effect is improved, but sipe structure complexity increases
Solution Approach 1:
The sipe is divided into four distinct portions with specific functional assignments. This segmentation provides improved snow biting effect through multi-directional edges while maintaining a systematic and manageable structure that is not excessively complex.
Solution Approach 2:
Multiple sipe portions are merged into a single integrated sipe structure within the tread block. This combining approach provides the snow biting effect of multiple directions while presenting a unified structure that simplifies manufacturing and maintenance.
Data Source
AI summary
In one aspect, a tire has a tread portion with at least one tread block having an elongated shape extending transversely to a circumferential centerline and comprising a sipe with i) a pair of elongated sipe portions extending predominantly along the elongated shape, and ii) a joint sipe portion extending along the elongated shape, wherein the elongated sipe portions converge into the joint sipe portion. In another aspect, a sipe comprises along its elongated sipe portion a) a radially outer sipe portion extending with an undulated shape; b) a radially inner sipe portion, extending with an essentially linear shape; and c) a transition portion, provided radially between the radially outer sipe portion and the radially inner sipe portion, and having a shape radially transitioning from the undulated shape of the radially outer sipe portion to the linear shape of the radially inner sipe portion.