Light Alloy CVJ Cup with Ceramic Coating for Wear Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Constant velocity joints in automobiles face challenges in reducing weight while maintaining durability and wear resistance, especially when using light alloys, as they tend to experience increased wear and abrasion due to insufficient hardness and difficulties in forming hardened layers through heat treatment.
Innovation Solution
A constant velocity joint design featuring a cup part made of light alloy with a high hardness layer composed of ceramic or cermet on its inner surface, which includes a multilayer structure for enhanced wear resistance and durability, and a manufacturing method that incorporates shot peening and thermal spraying to form the high hardness layer without the need for precise mold design or heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the cup part is made of light alloy to reduce weight, then the weight of the constant velocity joint is reduced, but the hardness of the cup part becomes insufficient and wear resistance deteriorates
Solution Approach 1:
The invention uses a composite structure where a light alloy cup part is combined with a ceramic or cermet coating layer. The light alloy provides weight reduction while the ceramic/cermet coating provides the necessary hardness and wear resistance. This composite approach allows both lightweight and high strength properties to coexist in the same component.
Solution Approach 2:
The invention applies the ceramic or cermet coating only to specific surfaces of the cup part that require high wear resistance, such as the inner surface and groove surfaces that contact torque transmitting members. This localized application of hard material provides strength where needed while maintaining the overall lightweight structure.
2Strength
If heat treatment is applied to form a hardened layer on the cup part to improve wear resistance, then wear resistance is improved, but the process becomes complex and costly
Solution Approach 1:
The invention replaces the thermal field (heat treatment) with a coating deposition process. Instead of using high-temperature heat treatment to harden the light alloy, the invention applies ceramic or cermet coatings through coating processes, which are simpler and more controllable for achieving the desired hardness and wear resistance.
3Weight of moving object
If the cup part is miniaturized to reduce weight, then weight is reduced, but the weight reduction reaches a limit
Solution Approach 1:
The invention changes the material parameter (density) by using light alloy instead of traditional steel, and further changes the surface property parameter by adding ceramic/cermet coating. This allows weight reduction without miniaturizing the component dimensions, thereby avoiding the limits of miniaturization while still achieving significant weight reduction.
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 results in a lightweight constant velocity joint with improved wear resistance and durability, simplified manufacturing, and reduced costs, as the high hardness layer can be adjusted for desired dimensions and properties, effectively suppressing wear and abrasion while maintaining structural integrity.
Implementation Method 1
a shot peening processed part is formed on an inner surface of the cup part
Implementation Method 2
a high hardness layer made of ceramic or cermet as a principal component is formed on an inner surface of the cup part
Data Source
AI summary
A first constant velocity joint is equipped with a cup part made of a light alloy. First ball grooves that receive a torque from torque transmitting members are formed on an inner wall of the cup part. A high hardness layer made of ceramic or cermet as a principal component thereof is formed on an inner surface of the cup part including at least inner surfaces of the first ball grooves.