Chain Joint Assembly Wear Reduction via Elastic Ring
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Solution Overview
Problem
Conventional chain joints experience rapid wear and degradation due to concentrated load distribution, leading to potential breakage and increased manufacturing complexity and cost, especially when subjected to high mechanical loads.
Innovation Solution
A chain joint assembly featuring a pin integral with a chain link and a bushing with a constant inside diameter, incorporating an elastic ring aligned with the bushing, which provides a larger lubricant chamber and reduces friction through even load distribution and high surface hardness, allowing for better wear resistance and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional chain joints are used with simple pin and bushing structures, then manufacturing is simple and cost is low, but load concentration occurs on contact surfaces leading to rapid wear and degradation
Solution Approach 1:
The bushing is segmented into multiple arc-shaped segments that can rotate relative to each other around the pin. This segmentation allows the load to be distributed across multiple contact surfaces and enables the segments to self-adjust their positions, preventing load concentration on single edges while maintaining simple manufacturing of individual segments
Solution Approach 2:
The bushing segments are designed to rotate dynamically around the pin axis, transforming the static contact interface into a dynamic one. This rotation allows the contact surfaces to continuously change, distributing wear evenly across all segments and preventing localized degradation, while the segments remain simple in shape for easy manufacturing
2Reliability
If the pin is overdimensioned to minimize wear under load, then wear resistance improves, but device complexity and manufacturing cost increase
Solution Approach 1:
Instead of using a single large-diameter pin, the solution segments the bushing into multiple smaller arc-shaped segments that rotate around a standard-sized pin. This maintains the pin's original dimensions while achieving superior wear resistance through the segmented rotating structure, avoiding the need to overdimension the pin
Solution Approach 2:
The rotating segmented bushing structure provides dynamic load distribution that allows the use of standard-dimension pins rather than oversized ones. The rotation and segmentation create multiple moving contact surfaces that distribute wear, achieving high reliability without increasing the pin size or overall joint complexity
3Reliability
If special contoured bushings are used to distribute loads and minimize wear, then wear resistance improves, but manufacturing complexity increases leading to high overall cost
Solution Approach 1:
The bushing is divided into simple arc-shaped segments with uniform cross-sections, eliminating the need for complex contoured shapes. Each segment is a simple curved block that can be easily manufactured, yet when assembled and rotated around the pin, they collectively provide superior load distribution and wear resistance
Solution Approach 2:
The rotating mechanism transforms simple static segments into a dynamic system that provides complex load distribution functionality. The rotation allows the simple segments to continuously change their orientation and contact points, achieving the load-distributing effect of contoured bushings while maintaining simple manufacturing of the individual segments
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 solution significantly reduces wear rates, increases the joint's lifespan, and lowers production costs by distributing loads across larger surfaces, while maintaining simplicity and safety in use, with enhanced lubrication and heat dissipation.
Implementation Method 1
there being interposed at least one elastic ring which is substantially aligned with the portion of bushing which is coupled to a respective second chain link
Data Source
AI summary
A chain joint assembly includes a pin integral with at least one respective first chain link and a bushing, integral with at least one respective second chain link. The pin and the bushing are coaxial.The bushing has a constant inside diameter.At least one elastic ring is interposed between the pin and the bushing. The at least one elastic ring is substantially aligned with the portion of bushing which is coupled to a respective second chain link.