Tire Shoulder Groove Chamfer Design for Braking Grip
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tires with shoulder lateral grooves face a trade-off between dry road braking performance and wet road performance, as the deformation of grooves during braking on a dry surface can lead to reduced grip, while increasing groove opening area for better wet performance is not sufficient.
Innovation Solution
The tire design features shoulder lateral grooves with chamfered portions tilted at an angle of 5 to 30° relative to the tread profile, which prevent the ground-contact surface from rising during braking and increase the groove opening area for enhanced grip and wet performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If opening area of shoulder lateral groove is increased to improve wet performance, then wet performance is enhanced, but groove deformation during braking causes ground-contact surface to rise locally
Solution Approach 1:
The invention applies local quality by creating distinct zones with different properties: the groove area with optimized opening for water evacuation, and the adjacent land portion with controlled dimensions to maintain stability. The specific width ratio ensures the groove has sufficient opening area for wet performance while the land portion maintains enough structural integrity to prevent surface rise during braking
Data Source
AI summary
A tire that can improve braking performance on a dry road surface and wet performance is provided. The tire includes a tread portion 2. The tread portion 2 includes a shoulder land portion 5 disposed at an endmost tread edge side. The shoulder land portion 5 has a plurality of shoulder lateral grooves 10 that fully traverse the shoulder land portion 5. Each shoulder lateral groove 10 includes, in a transverse cross-section orthogonal to a longitudinal direction thereof, a bottom portion 11, a groove wall main body 12 extending from the bottom portion 11 outward in a tire radial direction, and a chamfered portion 15 between a ground-contact surface of the shoulder land portion 5 and the groove wall main body 12. The chamfered portion 15 is titled at an angle of 5 to 30° relative to a tread profile 13 obtained by extending the ground-contact surface.