Crawler Bias Cord Layer Configuration for Shearing Deformation Control
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Solution Overview
Problem
Crawlers face a trade-off between increased rigidity and straight traveling ability, as higher numbers of bias cord layers improve rigidity but can lead to shearing deformation and reduced straight traveling stability.
Innovation Solution
A crawler design with four bias cord layers, where each layer is embedded and inclined in a specific direction to minimize shearing deformation, combined with a main cord layer and optional reinforcing cord layers to enhance tensile and bending rigidity, ensuring improved straight traveling stability and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of bias cord layers is increased to improve rigidity, then the crawler's rigidity improves, but shearing deformation increases and straight traveling ability deteriorates
Solution Approach 1:
The bias cord layers are segmented into multiple layers (first, second, third, and fourth bias cord layers) with alternating inclination directions. This segmentation allows each layer to contribute to rigidity while the alternating patterns prevent cumulative shearing deformation, resolving the contradiction between improved rigidity and maintained straight traveling ability.
Solution Approach 2:
The bias cord layers are arranged with asymmetric inclination patterns relative to the crawler circumferential direction. The first and third bias cord layers incline in one direction while the second and fourth layers incline in the opposite direction, creating a balanced asymmetric structure that enhances rigidity without causing net shearing deformation.
2Strength
If four bias cord layers are provided from inner peripheral side toward outer peripheral side, then rigidity is improved, but shearing deformation varies across layers
Solution Approach 1:
The inclination direction of bias cords is inverted in alternating layers. The first bias cord layer inclines in a first direction, while the second bias cord layer inclines in a second direction opposite to the first direction. This inversion pattern continues through all four layers, ensuring that shearing deformations in opposite layers counterbalance each other while maintaining high rigidity.
Data Source
AI summary
A main cord layer is embedded in a crawler main body, and a first bias cord layer, a second bias cord layer, a third bias cord layer and a fourth bias cord layer are embedded at an outer peripheral side of the main cord layer. Bias cords of the second bias cord layer and bias cords of the third bias cord layer are inclined in a direction that is opposite, with respect to a crawler circumferential direction, bias cords of the fourth bias cord layer that are inclined with respect to the crawler circumferential direction.