Sliding System with Cr Plating and Mo Lubricant
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Solution Overview
Problem
Existing sliding systems fail to significantly reduce friction between sliding surfaces, limiting their performance, durability, and reliability, especially under severe operational conditions.
Innovation Solution
A combination of a chromium plating film with a specific crystalline structure and a lubricant oil containing an oil-soluble molybdenum compound, known as a trinuclear Mo compound, which reduces the friction coefficient between sliding surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Cr plating films and ordinary lubricant oils are used, then the manufacturing process is simple and cost-effective, but the friction coefficient remains high and durability is limited
Solution Approach 1:
The invention changes the crystallographic orientation parameters of the Cr plating film by controlling the plating conditions to achieve specific (110), (211), or (310) orientations instead of the conventional (222) orientation. This parameter change in crystal structure enables the Cr plating film to work synergistically with Mo-containing lubricant oil, achieving friction coefficients of 0.05 or less and significantly improved durability without complicating the manufacturing process
Solution Approach 2:
The invention creates a composite system combining Cr plating film with specific crystal orientation and Mo-containing lubricant oil. The Cr plating film provides a specific crystal structure that, when combined with the Mo compound in the lubricant, forms a low-friction interface. This composite approach achieves friction coefficients of 0.05 or less while maintaining manufacturing simplicity
2Reliability
If Cr plating film with (222)-orientated crystalline structure is used, then the manufacturing process is conventional, but the friction coefficient is not reduced as expected
Solution Approach 1:
The invention changes the crystallographic orientation parameters from conventional (222) to specific (110), (211), or (310) orientations by controlling plating parameters such as current density, bath temperature, and additives. This precise control of crystal orientation parameters enables the Cr plating film to achieve friction coefficients of 0.05 or less when combined with Mo-containing lubricant oil
3Use of energy by moving object
If friction coefficient is reduced to enhance performance, then energy consumption decreases, but the combination of specific Cr plating and Mo-lubricant oil requires precise control
Solution Approach 1:
The invention establishes specific parameter ranges for Cr plating (current density 1-10 A/dm², bath temperature 20-60°C, plating time 1-10 minutes) to achieve the required crystal orientation. These controlled parameters ensure the Cr plating film works effectively with Mo-containing lubricant oil to achieve friction coefficients of 0.05 or less, reducing operational energy consumption
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 combination achieves a friction coefficient of 0.05 or less, enhancing the durability and reliability of sliding systems, particularly in long-term use under severe conditions, and contributes to reduced fuel consumption and performance upgrades in applications like engines and drive systems.
Implementation Method 1
At least one of the sliding surfaces comprises a coating surface of a crystalline chromium plating film
Implementation Method 2
The lubricant oil contains an oil-soluble molybdenum compound that has a chemical structure of a trinuclear of Mo
Data Source
AI summary
A sliding system includes a pair of sliding members having sliding surfaces that can relatively move while facing each other and a lubricant oil interposed between the sliding surfaces facing each other. At least one of the sliding surfaces includes a coating surface of a crystalline Cr plating film. The lubricant oil contains an oil-soluble molybdenum compound comprising a trinuclear Mo structure. In particular, considerably low friction properties can be developed by a combination of the Cr plating film, in which at least one of three types of peak area intensity ratios (P1 to P3) as obtained by X-ray diffraction falls within a predetermined range (P1≥0.015, P2≥0.02, P3≥0.03), and the lubrication oil which contains the trinuclear Mo structure.