Elastic Crawler Lug Layout for Grip and Low Surface Pressure
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Solution Overview
Problem
Conventional elastic crawlers face challenges in securing sufficient driving force while minimizing surface pressure on the tread sides of the drive lugs, due to independent drive lugs on both sides of the crawler width direction, leading to disconnection and reduced grip on the ground.
Innovation Solution
The elastic crawler design incorporates drive lugs with central and side lug portions that are integrally formed, featuring wide and narrow lug portions, and lateral slip preventing protrusions to enhance grip and reduce surface pressure, while ensuring continuous track roller rolling paths for improved stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If drive lugs are arranged independently on both sides in the crawler width direction, then surface pressure on the tread sides can be reduced, but driving force between the drive lugs and the ground cannot be sufficiently secured
Solution Approach 1:
The patent merges the drive lugs on both sides in the crawler width direction by forming them integrally across the central line, creating a continuous structure that spans the width of the crawler. This integration allows the drive lugs to function as a unified gripping element, securing driving force while maintaining reduced surface pressure through the elastic material distribution.
Solution Approach 2:
The drive lugs are segmented into multiple portions (first, second, third, and fourth lug portions) arranged alternately on both sides of the central line, with recesses between them. This segmentation allows the lugs to independently engage with the ground while being part of an integrated structure, optimizing both pressure distribution and gripping force.
2Stress or pressure
If wide lug portions are located on the side closer to the engaging holes, then surface pressure on the central tread can be reduced and damage to drive lugs can be reduced, but the drive lugs become disconnected and cannot sufficiently secure driving force
Solution Approach 1:
The patent employs asymmetric arrangement of lug portions and recesses relative to the central line, with alternating wide and narrow portions on each side. This asymmetric design allows optimal pressure distribution on the central tread while maintaining continuous engagement with the ground through the alternating pattern, resolving the contradiction between pressure reduction and driving force security.
Solution Approach 2:
Different portions of the drive lugs have different local qualities - wide lug portions for reduced pressure and narrow lug portions for enhanced gripping. The alternating arrangement of these different local qualities across the width of the crawler allows each portion to perform its specific function optimally while contributing to the overall integrated structure.
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 design effectively secures driving force, reduces surface pressure, enhances durability, and improves soil removal performance while minimizing vibration and tilting, thereby improving the overall performance and longevity of the crawler.
Implementation Method 1
a crawler main body mainly composed of an elastic material, such as rubber
Implementation Method 2
it is difficult to sufficiently secure the driving force between the drive lugs and the ground
Data Source
AI summary
An elastic crawler has, on a tread side, drive lugs including a central lug portion arranged in a crawler width direction between engaging holes of a crawler main body and side lug portions arranged alternately on one side in the crawler width direction, corresponding to the central lug portions on both sides in a crawler revolving direction of the engaging holes, and an inter-lug recess arranged between the side lug portions on both sides in the crawler revolving direction on an opposite side to the side lug portion with respect to the engaging holes, and the side lug portions each have a wide lug portion on a side closer to the central lug portion, and the wide lug portion is integrally formed with two central lug portions adjacent to each other in the crawler revolving direction, straddling two core metals adjacent to each other in the crawler revolving direction.