Core-Shell Chain Roller Assembly for Wear-Resistant Strength
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Solution Overview
Problem
Roller chains experience wear due to friction with sprockets, requiring high-performance materials to maintain efficiency and reduce wear, but existing designs face challenges in material utilization and assembly complexity.
Innovation Solution
A core-shell structured roller composed of a shell roller part and a core roller part, where the core roller is positioned concentrically within the shell roller, with snap-fit assembly and optional ribs for enhanced stability, made from plastic materials with glass fibers for reduced stress and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-piece roller is used, then the structure is simple, but wear resistance and strength are insufficient under high friction conditions
Solution Approach 1:
The roller is divided into two separate parts: a shell roller part and a core roller part. The shell roller part provides wear resistance through its material composition (plastic with glass fibers), while the core roller part provides structural strength. This segmentation allows each part to be optimized for its specific function, resolving the contradiction between wear resistance and structural simplicity.
Solution Approach 2:
The roller uses composite material construction where the shell roller part and core roller part are made from different plastic materials with glass fibers. This composite approach enables the outer shell to provide low friction and wear resistance while the inner core provides high strength, simultaneously improving reliability without requiring a single complex high-performance material.
2Strength
If thick walls are used in the roller, then strength is improved, but stress concentration and manufacturing complexity increase
Solution Approach 1:
By segmenting the roller into shell and core parts with different wall thicknesses, the design allows thin-walled construction without compromising overall strength. The core roller part provides structural support with optimized wall thickness, while the shell roller part provides protective function. This eliminates the need for uniformly thick walls, reducing stress concentration and manufacturing complexity.
Solution Approach 2:
Different parts of the roller have different wall thicknesses optimized for their specific functions. The core roller part has wall thickness optimized for structural strength, while the shell roller part has wall thickness optimized for wear protection. This local optimization allows thin-walled construction overall while maintaining necessary strength where required.
3Reliability
If separate materials are used for different roller parts, then wear resistance and strength are optimized, but assembly complexity increases
Solution Approach 1:
The core roller part is nested inside the shell roller part, forming a compact assembled structure. This nesting arrangement allows separate material optimization for each part while maintaining a space-efficient final assembly. The concentric arrangement simplifies the assembly process compared to other multi-material configurations.
Solution Approach 2:
The shell roller part and core roller part are combined through assembly to form a unified roller component. This merging of separately manufactured parts with optimized materials creates a functional whole that achieves both wear resistance and strength without requiring complex integrated manufacturing processes.
4Ease of manufacture
If the roller is designed as a single piece, then manufacturing is simple, but dirt accumulation and maintenance difficulty increase
Solution Approach 1:
The roller is segmented into removable shell and core parts that can be assembled and disassembled. This segmentation provides maintenance accessibility, allowing the shell roller part to be removed for cleaning or replacement while the core roller part remains in place. It also enables separate manufacturing optimization for each part.
Data Source
AI summary
The invention relates to a roller for a chain which is constructed by a shell roller part and a core roller part, wherein the shell roller part comprises a first outer cylinder, a first inner cylinder which is positioned concentrically inside the first outer cylinder, and a bottom which is positioned at and connected to one end of the first inner cylinder and the first outer cylinder; and wherein the bottom is stretched from the first inner cylinder to the first outer cylinder; wherein the core roller part comprises a second outer cylinder, a second inner cylinder which is positioned concentrically inside the second outer cylinder, and a top which is positioned at and connected to one end of the second inner cylinder and the second outer cylinder; and wherein the top is stretched from the second inner cylinder to the second outer cylinder; wherein the core roller part is positioned concentrically in the space surrounded by the first inner cylinder, the first outer cylinder and the bottom.