Machinery Lubrication Article - Friction Modifiers
- Thread starter Shannow
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wemay
Site Donor 2023
Very nice overview. With double the current CAFE requirements on the horizon, "oil" might become the most scarce ingredient of future lubrications.
Originally Posted By: Shannow
http://machinerylubricationindia.com/mag...ction-modifiers
not a bad read.
Quote:
A)Organic Friction Modifiers
Mode of Action ; Friction Modifier Products
Formation of reacted layers = (Saturated fatty acids, phosphoric and thiophosphoric acids, sulfur-containing fatty acids)
Formation of adsorbed layers = (Long-chain carboxylic acids, esters, ethers, amines, amides, imides)
Formation of polymers = (Partial complex esters, methacrylates, unsaturated fatty acids, sulfurized olefins)
Mechanical types = (Organic polymers)
B) Other Friction Modifiers
Type of Friction ; Modifier Products
Metallo-organic compounds = (Molybdenum and copper compounds)
Mechanical types = (Molybdenum disulfide, graphite, PTFE)
Which of these FM's would be for :-
a)auto transmission clutches;
b)manual trans synchro;
c)differentials and
d)engines respectively ?
Edit:
Quote:
As fuel economy standards become more stringent, more will be required of engine oils. While the technology for friction modifiers continues to evolve, the most effective way to improve fuel economy or energy consumption is to lower the viscosity of the lubricant. However, you can only go so far before losing the hydrodynamic film and operating in either mixed-film lubrication or boundary lubrication. It is in these two lubrication regimes that the use of friction modifiers becomes critical for reducing friction.
The trend is moving from hydrodynamic regimes in journal bearings to mixed film lubrication AND boundary lubrication ......
Let's brace ourselves for increased wear , but 'acceptable' wear !
http://machinerylubricationindia.com/mag...ction-modifiers
not a bad read.
Quote:
A)Organic Friction Modifiers
Mode of Action ; Friction Modifier Products
Formation of reacted layers = (Saturated fatty acids, phosphoric and thiophosphoric acids, sulfur-containing fatty acids)
Formation of adsorbed layers = (Long-chain carboxylic acids, esters, ethers, amines, amides, imides)
Formation of polymers = (Partial complex esters, methacrylates, unsaturated fatty acids, sulfurized olefins)
Mechanical types = (Organic polymers)
B) Other Friction Modifiers
Type of Friction ; Modifier Products
Metallo-organic compounds = (Molybdenum and copper compounds)
Mechanical types = (Molybdenum disulfide, graphite, PTFE)
Which of these FM's would be for :-
a)auto transmission clutches;
b)manual trans synchro;
c)differentials and
d)engines respectively ?
Edit:
Quote:
As fuel economy standards become more stringent, more will be required of engine oils. While the technology for friction modifiers continues to evolve, the most effective way to improve fuel economy or energy consumption is to lower the viscosity of the lubricant. However, you can only go so far before losing the hydrodynamic film and operating in either mixed-film lubrication or boundary lubrication. It is in these two lubrication regimes that the use of friction modifiers becomes critical for reducing friction.
The trend is moving from hydrodynamic regimes in journal bearings to mixed film lubrication AND boundary lubrication ......
Let's brace ourselves for increased wear , but 'acceptable' wear !
Last edited:
MolaKule
Staff member
Originally Posted By: zeng
Which of these FM's would be for :-
a)auto transmission clutches;
b)manual trans synchro;
c)differentials and
d)engines respectively ?
Why?
If you are formulating for a specific fluid then contact me.
If not, this has been answered in various posts.
Which of these FM's would be for :-
a)auto transmission clutches;
b)manual trans synchro;
c)differentials and
d)engines respectively ?
Why?
If you are formulating for a specific fluid then contact me.
If not, this has been answered in various posts.
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