Rough-Terrain Tire Block Geometry for Mud Traction Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tires for rough terrain lack enhanced traction performance, which is essential for navigating challenging ground conditions such as mud and soft surfaces.
Innovation Solution
A tire design featuring blocks with specific geometric configurations, including radially outer and inner portions, and angled side walls, which enhance shear force and penetration into the ground, thereby improving traction and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If blocks with simple side wall surfaces are used, then manufacturing is easier, but traction performance on rough terrain is insufficient
Solution Approach 1:
The side wall surface of each block is segmented into multiple portions (first side wall surface, second side wall surface, third side wall surface) with different inclinations. This segmentation allows each portion to perform different functions: the first portion provides initial ground contact and shear force, while subsequent portions enable progressive penetration and anchoring, thereby improving traction performance without excessive manufacturing complexity
Solution Approach 2:
Different portions of the block side wall surfaces are given different local qualities through varying inclinations. The first side wall surface has a gentler inclination for initial contact, while the second and third side wall surfaces have steeper inclinations for deep penetration. This local differentiation optimizes traction performance across different stages of block-ground interaction
2Reliability
If blocks with steep side wall inclinations are used, then penetration into ground is improved, but chipping and cracking occurs
Solution Approach 1:
The side wall surface is divided into multiple segments with progressively steeper inclinations. The first side wall surface has a gentler inclination that reduces stress concentration, while the second and third portions provide the necessary steep angles for penetration. This gradual transition prevents sudden stress spikes that cause chipping and cracking
Solution Approach 2:
The first side wall surface acts as a cushioning transition zone before the block reaches the steeper second and third side wall surfaces. This gradual inclination change beforehand cushions the structural transition, preventing direct shock loading that would cause chipping and cracking of the block structure
3Reliability
If blocks with large shear force capability are used, then traction performance is improved, but block design complexity increases
Solution Approach 1:
The complex geometry needed for large shear force capability is achieved through segmentation of the side wall surfaces into distinct inclined portions. Each segment serves a specific function in generating shear force, making the overall complex shape manufacturable and analyzable through systematic design rather than arbitrary complexity
Solution Approach 2:
The block design employs asymmetric side wall surfaces with different inclinations on different portions. This asymmetry is deliberately designed to optimize shear force generation during rotation, with each asymmetric portion contributing differently to the overall traction performance, thereby achieving high shear force capability through purposeful asymmetric geometry rather than random complexity
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
The tire achieves improved traction and instantaneous power performance on rough terrain by deep penetration and increased shear force, maintaining effectiveness over time while preventing chipping and cracking.
Implementation Method 1
the radially outer portion extending substantially straight and radially inwardly from the first edge, while inclining toward the toe side in the intended tire rotational direction
Implementation Method 2
a radially inner portion extending from the radially outer portion to the tread base portion while curving in an arc shape
Implementation Method 3
Such block is explained as being capable of exerting a large shearing force and deeply digging into mud or soft ground
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A tire for running on rough terrain for which an intended tire rotational direction is specified. The tread portion is provided with blocks raised from a tread base portion. Each block has a first side wall surface comprising a radially outer portion extending substantially straight and radially inwardly, while inclining toward the toe side in the intended tire rotational direction, and a radially inner portion extending from the radially outer portion to the tread base portion while curving in an arc shape. The radially outer portion has a radial length of from 30% to 70% of a radial height of the block.