Twin Bushing Track Chain Cartridge Axial Stiffness
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Solution Overview
Problem
Prior art track chain assemblies are mechanically complex, difficult to manufacture and assemble, and lack sufficient axial stiffness, leading to structural issues such as link walking, shoe bolt loosening, and link cracking.
Innovation Solution
The cartridge assembly design includes a pin with a lubricant channel, inner and outer bushings, inserts, collars, and thrust rings that provide improved axial stiffness by supporting seals with thrust rings rather than inserts, allowing for better structural integrity and reduced assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If prior art track chain assemblies are used, then the track chain can rotate and move, but the axial stiffness is insufficient leading to link walking, shoe bolt loosening, and link cracking
Solution Approach 1:
The cartridge assembly is divided into multiple functional components including inner bushing, outer bushing, inserts, collars, and thrust rings. Each component serves a specific structural function to collectively enhance axial stiffness and prevent structural failures such as link walking and shoe bolt loosening.
Solution Approach 2:
The cartridge assembly uses composite construction with multiple materials and components working together. The combination of bushings, inserts, collars, and thrust rings creates a composite structure that provides superior axial stiffness and structural integrity compared to single-material designs.
2Reliability
If prior art cartridge assemblies are used, then the track chain can function, but the assembly is mechanically complex and difficult to manufacture and assemble
Solution Approach 1:
While the assembly is segmented into multiple components for structural integrity, each component is designed to be a simple, standardized part that is easy to manufacture. The segmentation allows for modular assembly and simplifies quality control during manufacturing.
Solution Approach 2:
The cartridge assembly components are designed with universal features that allow them to serve multiple functions. For example, the bushings provide both rotational support and structural alignment, while the collars serve both as retaining features and as mounting points for seals.
3Strength
If inserts are used to support seals in prior art assemblies, then the assembly can be constructed, but the axial stiffness is insufficient and structural issues occur
Solution Approach 1:
The seal support function is extracted from the inserts and assigned to dedicated thrust rings. This separation of functions allows the inserts to focus on structural connection while the thrust rings provide axial support and seal mounting, thereby enhancing overall axial stiffness and reducing structural issues.
Solution Approach 2:
Thrust rings are introduced as intermediary components between the inserts and the seals. These thrust rings serve as mediators that transfer and distribute axial loads, providing structural support and stability while allowing the inserts to maintain their primary connection function.
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 enhances axial stiffness, reduces link walking and cracking, and improves the overall structural integrity of the track chain assembly, leading to a longer working life and reduced mechanical complexity.
Implementation Method 1
The pin includes a lubricant channel that delivers lubricant to various other channels in the cartridge assembly
Data Source
AI summary
A cartridge assembly for a track chain is disclosed. The cartridge assembly includes a pin that has a lubricant channel therein. The pin is accommodated in an inner bushing that also has a channel extending therethrough for accommodating the pin. The pin extends beyond either end of the inner bushing. The pin and inner bushing are partially disposed in an outer bushing that also has a channel for accommodating the pin in inner bushing. The ends of the inner bushing and pin extend beyond the ends of the outer bushing. First and second inserts are disposed at either end of the inner bushing. The first and second inserts are disposed between the outer bushing and a pair of opposing collars which are disposed on the ends of the pin beyond the inserts and beyond the ends of the inner bushing. The inserts and collars each include seals. The seals of the collars are supported by one or more thrust rings as opposed to the inserts or partially by the inserts.