Tread Sipe Layout for Wet Tire Drainage Across Land Portions
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Solution Overview
Problem
Tires on wet roads experience insufficient water drainage due to the design of sipes in existing tire technologies, leading to reduced drainage performance.
Innovation Solution
The tire design incorporates a land portion row with recesses and intermittent sipes that intersect the tread width direction, allowing for continuous water flow across multiple land portions and enhanced drainage by communicating with circumferential grooves, improving water intake and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sipes are provided in a rib with chamfered portions at opening edges to improve drainage performance, then water intake capability is enhanced, but water discharge efficiency becomes insufficient
Solution Approach 1:
The sipe is divided into multiple segments corresponding to different land portions, with each segment having specific functions. The first sipe segment in the first land portion has a chamfered portion for water intake, while the second sipe segment in the second land portion provides water discharge. This segmentation allows simultaneous optimization of both water intake and discharge functions within the same sipe structure.
Solution Approach 2:
The sipe extends not only in the tread width direction but also connects across land portions through the circumferential groove direction. This creates a three-dimensional drainage pathway that enables water to be transported from the intake region to the discharge region, adding a spatial dimension to the drainage function.
2Device complexity
If circumferential grooves are provided to create land portions for sipe arrangement, then drainage paths are established, but continuous water flow across multiple land portions is interrupted
Solution Approach 1:
The circumferential groove serves multiple functions: it defines the boundaries of land portions, provides a pathway for water flow between land portions, and allows the sipe to extend continuously across multiple land portions. This multi-functionality resolves the contradiction by making the groove structure contribute to both organization and continuity of the drainage system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly enhances drainage performance in the tread ground contact region, ensuring efficient water removal and maintaining tire rigidity.
Implementation Method 1
an intermittent sipe extending in an orientation intersecting the width direction of the tread, intermittently by being interrupted by the circumferential groove, from a position of a start end corresponding to the recess, across three land portions of the four land portions excluding the land portion on the one end side, wherein the intermittent sipe opens in a surface of each of the three land portions via an inclined surface from the surface of each of the three land portions toward the intermittent sipe
Data Source
AI summary
Provided is a tire including, in a surface of a tread of the tire, a land portion row in which four land portions are arranged in parallel in a width direction of the tread, in a land portion on one end side of the land portion row, a recess that opens in a circumferential groove on an adjacent land portion side, and an intermittent sipe extending in an orientation intersecting the width direction of the tread, intermittently by being interrupted by the circumferential groove, from a position of a start end corresponding to the recess, across three land portions of the four land portions excluding the land portion on the one end side, wherein the intermittent sipe opens in a surface of each of the three land portions via an inclined surface from the surface of each of the three land portions toward the intermittent sipe.