Tire Tread Groove Layout for Mud Traction and Lower Road Noise
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Solution Overview
Problem
Tires designed for muddy terrain face challenges in improving noise performance while maintaining excellent mud performance, due to tightening regulations on vehicle running noise.
Innovation Solution
The tire features a tread portion with four circumferential grooves and five land portions, including inclined first and second middle lateral grooves that overlap virtual zones, reducing impact force and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tire is designed with tread blocks optimized for mud performance, then mud performance is improved, but vehicle running noise increases
Solution Approach 1:
The tread portion is segmented into multiple land portions (first through fifth) separated by circumferential grooves, with each land portion containing further segmented lateral grooves. This multi-level segmentation allows the tire to maintain mud performance through effective mud ejection paths while reducing noise through distributed impact patterns across multiple smaller elements rather than large continuous tread blocks
Solution Approach 2:
Different land portions have different groove configurations tailored to their specific functions. The first and second middle land portions have inclined lateral grooves for noise reduction, while the third middle land portion has lateral grooves for mud discharge. This localized optimization allows each region to contribute differently to overall performance, balancing noise reduction with mud performance
2Object-generated harmful factors
If circumferential grooves are added to improve noise performance, then noise performance is improved, but mud performance deteriorates
Solution Approach 1:
The inclined lateral grooves in the first and second middle land portions are designed to make contact with the road surface in advance of the main tread blocks. This preliminary contact absorbs and distributes impact forces before they reach the main tread-mud interface, reducing noise generation while preserving the tread's mud engagement capability
Solution Approach 2:
The lateral grooves extend continuously across the axial width of the middle land portions, ensuring continuous noise reduction action throughout the tire's rotation. This continuous groove structure maintains noise suppression effectiveness while the grooves between land portions ensure continuous mud ejection paths
Data Source
AI summary
A tire has a tread portion comprises four circumferential grooves and five land portions. The four circumferential grooves include a first shoulder circumferential groove, a second shoulder circumferential groove, a first crown circumferential groove and a second crown circumferential groove. The five land portions include a first middle land portion, a second middle land portion and a crown land portion. The first middle land portion is provided with first middle lateral grooves. The second middle land portion is provided with second middle lateral grooves. In a plan view of the tread portion, a first end of each first middle lateral groove overlaps with a first virtual zone, and a second end of each first middle lateral groove overlaps with a second virtual zone.