Pneumatic Tire Sipe Geometry for Uniform Tread Stiffness
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Solution Overview
Problem
Existing pneumatic vehicle tires with profile blocks or profile ribs suffer from uneven wear and changing stiffness over tread life, which affects snow performance and grip characteristics.
Innovation Solution
The tire design incorporates radially outer and inner incision sections angled between 15° to 30° to the radial direction, a central section at 0°, and an additional cut section angled 0° to 2°, with specific lengths and depths to maintain uniform stiffness and enhance snow grip throughout tread wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cuts are made in profile blocks, then snow performance is improved, but tread stiffness becomes uneven during wear
Solution Approach 1:
The cut is divided into multiple sections (first cut section, second cut section, third cut section) with different orientations. The first and third sections extend at angles (15°-30°) to the radial direction, while the second section extends parallel to the radial direction (0°). This segmentation allows different portions of the cut to serve different functions: the angled sections enhance snow grip while the central parallel section maintains structural stability and uniform stiffness characteristics throughout tread wear.
2Ease of operation
If cuts with large angles to radial direction are used, then grip characteristics are improved, but tread stability deteriorates
Solution Approach 1:
Different sections of the cut have different local qualities in terms of orientation. The first and third cut sections are positioned to provide enhanced grip characteristics with their angled orientation (15°-30° to radial direction), while the second cut section maintains tread stability with its parallel orientation to the radial direction. This local differentiation allows the single cut structure to simultaneously provide both improved grip and maintained stability.
Data Source
Figure 1~2
AI summary
The invention relates to a vehicle pneumatic tire with incisions (5, 6) in the profile extending at an angle of 0° to 50° to the axial direction, having a incision base (8) and a incision medial surface (mF) with a maximum depth (tE) which corresponds at least to the tread depth (TP) reduced by 2.0 mm, wherein each incision (5, 6) has, at least in a partial area, a radially outer incision section (10a) inclined to the radial direction, a radially inner incision section (10c) extending to the incision base (8) and inclined in the same direction with respect to the radial direction as the radially outer incision section (10a), and a middle incision section (10b) extending between these two incision sections (10a, 10c).wherein the cut mid-surface (mF) has a radially outer kink (Ka) at the junction of the radially outer cut section (10a) and the middle cut section (10b), and a radially inner kink (Kb) at the junction of the middle cut section (10b) and the radially inner cut section (10c). The radially outer cut section (10a) and the radially inner cut section (10c) each have a radially measured length (ca, cc) of 2.0 mm to 3.0 mm, relative to the cut mid-surface (mF), wherein the radially outer cut section (10a) runs at an angle (α) of 15° to 30° to the radial direction, and the radially inner cut section (10c) runs at an angle (γ) of 15° to 30° to the radial direction, wherein the radially inner kink (Kb) lies on a radially extending first reference line (L1).which runs at the radially outer end of the radially outer cut section (10a) through the cut mid-surface (mF), on a radially extending second reference line (L2) which runs through the radially outer kink (Ka) of the cut mid-surface (mF), or lies between the first reference line (L1) and the second reference line (L2).