Off-Road Tire Tread Layout for Uneven Terrain Grip
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Solution Overview
Problem
Off-road vehicle tires lack sufficient gripping capability on uneven terrain, leading to reduced traction and stability.
Innovation Solution
The design of pneumatic tires with alternating first and second tread patterns featuring main lands and stepped lands on opposite sides of the tread equator, along with equatorial and lateral lands, which increase the surface area and provide enhanced engagement with irregular surfaces, thereby improving grip on diverse terrains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tread patterns are used, then the tire structure is simple, but the gripping capability on uneven terrain is insufficient
Solution Approach 1:
The tread pattern is segmented into multiple functional elements including main lands, stepped lands, equatorial lands, and lateral lands. Each segment serves specific functions for different aspects of terrain engagement, allowing the tire to grip various surface features effectively while maintaining a structured yet complex design
Solution Approach 2:
The tread design incorporates stepped lands with vertical steps that extend radially outward from the tread surface. This adds a third dimension (radial depth) to the traditional two-dimensional tread pattern, creating multiple engagement surfaces that can hook onto rocks, sticks, and uneven terrain features
2Reliability
If the contact surface area is increased, then the gripping capability is enhanced, but the tire structure becomes more complex
Solution Approach 1:
The increased contact surface area is achieved through segmentation into multiple land elements (main lands, stepped lands, equatorial lands, lateral lands) rather than a single large continuous surface. This segmentation allows the tire to engage with different terrain features simultaneously while distributing the structural complexity across distinct functional components
Solution Approach 2:
The stepped lands extend radially outward with vertical steps, adding depth dimension to the contact surface. This creates multiple tiers of engagement surfaces that increase the effective contact area with terrain features while organizing the complexity in a structured vertical arrangement
Data Source
AI summary
Pneumatic tires include a tire body having a pair of tire sidewalls, a tread wall extending between the tire sidewalls and a tread portion on the tread wall. The tread portion may include alternating first and second tread patterns around the circumference of the tread wall. Each of the first and second tread patterns may have a main land protruding from the tread wall on a first side of a tread equator dividing the tread portion into equal first and second halves. A main land sidewall portion may extend from the main land and protruding from a first one of the pair of tire sidewalls. A stepped land may protrude from the tread wall on a second side of the tread equator. A stepped land sidewall portion may extend from the stepped land and protruding from a second one of the pair of tire sidewalls.