Track Pad Bottom Voids for Load Distribution and Crack Resistance
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Solution Overview
Problem
Current track pad geometries for heavy equipment on hard surfaces are prone to cracking and deformation due to high loads, leading to increased manufacturing costs and maintenance needs.
Innovation Solution
A track chain member design featuring a shoe member with lugs, ribs, and strategically placed bottom voids forming a support pillar, which distributes load effectively and minimizes deformation, while allowing for efficient manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional track pad geometry is used on hard surfaces, then the track pad can support heavy loads, but it develops cracks and experiences deformation due to the rigidity of hard surfaces and heavy loads
Solution Approach 1:
The track pad is divided into multiple sections with bottom voids creating distinct load-bearing zones. The voids segment the solid material into separate regions that can independently manage stress, preventing crack propagation across the entire structure while maintaining overall load-bearing capacity.
Solution Approach 2:
The track pad features localized thickening at the front and rear ends where loads are applied, while the middle section contains voids. This creates different material densities and structural properties in different regions, with thicker sections absorbing impact forces and thinner sections reducing overall weight and material stress.
2Manufacturing precision
If lost core casting and full heat treating are used to manufacture track pads, then the track pad geometry can be achieved, but the manufacturing cost increases
Solution Approach 1:
The design extracts material from the track pad body to create bottom voids, which simplifies the casting process by eliminating the need for complex lost core assemblies. The voids are formed as negative spaces in the mold rather than requiring removable positive cores, significantly reducing manufacturing complexity and cost.
Solution Approach 2:
Instead of adding complex internal structures to achieve the desired geometry, the design inverts the approach by removing material to create voids. This inversion simplifies both the casting process and the subsequent heat treatment requirements, as the remaining solid sections are more uniform and easier to treat effectively.
3Productivity
If the thickness of side walls is minimized to improve manufacturing efficiency, then the track pad can be manufactured more efficiently, but the structural integrity may be compromised
Solution Approach 1:
The design compensates for reduced side wall thickness by adding structural depth in the vertical dimension through the bottom voids and support pillars. The voids extend downward from the top surface, creating a three-dimensional load distribution system that maintains strength even with thinner side walls.
Solution Approach 2:
The track pad creates a composite structure combining solid metal sections with void spaces. This composite arrangement allows the solid portions to be optimized for strength where needed (front/rear ends) while minimizing material in less critical areas, achieving both manufacturing efficiency and structural integrity.
Data Source
AI summary
A track chain member includes a first rib coupling the shoe member to the first lug; and a second rib coupling the shoe member to the second lug, defining a first side recess between the first rib and the second rib. The first side recess also extends from the exterior of the shoe member and underneath the first top surface, the first lateral end defines a first lateral end width along the track chain traveling direction, and the first side recess also spans the majority of the first lateral end width along the track chain traveling direction.