Magnesium Alloy Compressor Pulley Assembly with Integrated Inner Ring
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Solution Overview
Problem
Conventional pulley assemblies for vehicle air conditioners are heavy and prone to damage due to their steel composition, and they lack effective high-temperature resistance and corrosion protection, which can lead to bearing misalignment and reduced operational reliability.
Innovation Solution
A pulley assembly made of magnesium alloy with a cylindrical hollow design, featuring an integrally formed inner ring and bearing, and double coating layers for enhanced abrasion and corrosion resistance, along with specific surface treatments and structural features to prevent axial movement and ensure stable power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pulley is made of steel material, then the strength and durability are improved, but the weight increases
Solution Approach 1:
The pulley is made of magnesium alloy instead of steel, utilizing a lighter material to reduce weight while maintaining structural integrity. The inner ring is made of a different material (steel or other suitable material) and formed integrally with the magnesium alloy pulley through insert injection molding, creating a composite structure that combines the advantages of both materials - the lightweight properties of magnesium alloy and the strength/stability properties of the inner ring material.
2Weight of moving object
If the pulley is made of magnesium alloy, then the weight is reduced, but the resistance to high temperature and corrosion deteriorates
Solution Approach 1:
The composite structure combines magnesium alloy (lightweight) with an inner ring made of material having superior high-temperature and corrosion resistance properties. This allows the pulley to benefit from both the weight reduction of magnesium alloy and the environmental resistance of the inner ring material.
Solution Approach 2:
Different parts of the pulley are made of different materials suited to their specific functions - the magnesium alloy outer pulley for weight reduction and the inner ring material for high-temperature and corrosion resistance where these properties are most needed.
3Device complexity
If the bearing is directly mounted on the pulley, then the structure is simplified, but the bearing stability at high temperature deteriorates
Solution Approach 1:
The inner ring serves as an intermediary component between the magnesium alloy pulley and the bearing. It provides a stable mounting surface for the bearing that is less susceptible to thermal expansion and deformation at high temperatures, thereby maintaining bearing stability and alignment.
Solution Approach 2:
The composite structure of the pulley and inner ring provides both structural integration and functional differentiation, where the inner ring material is selected specifically for its ability to maintain dimensional stability at high temperatures.
4Manufacturing precision
If the pulley assembly is made with integrated inner ring and bearing, then the manufacturing precision is improved, but the manufacturing process complexity increases
Solution Approach 1:
The inner ring and pulley are merged into a single integrated component through insert injection molding, eliminating the need for separate manufacturing and assembly steps. This ensures precise alignment and positioning of the inner ring relative to the pulley, improving manufacturing precision while the molding process itself handles the complexity of creating the 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 magnesium alloy pulley assembly reduces weight, maintains bearing stability at high temperatures, prevents idle rotation, and provides improved corrosion and abrasion resistance through its innovative design and coatings, ensuring reliable power transmission.
Implementation Method 1
a cylindrical inner ring which is formed integrally with the inner circumferential surface of the pulley by insert injection molding
Implementation Method 2
double coating layers for enhanced abrasion and corrosion resistance
Implementation Method 3
the bearing is fixed to the inner circumferential surface of the inner ring
Data Source
AI summary
Disclosed therein are a pulley assembly for a compressor and a manufacturing method of the same, which can prevent possible damages during processing and is fit for high-temperature environment because a pulley is made of magnesium alloy.The pulley assembly includes: a cylindrical hollow pulley made of magnesium alloy; an inner ring formed integrally with the pulley by insert injection molding, the inner ring being fixed to the inner circumferential surface of the pulley and made of a different material from the pulley; and a bearing forcedly pressed and fixed to the inner circumferential surface of the inner ring.