Controlled-slip differentials (CSD) improve car operation under wheel slipping conditions. The performance of CSD's is dependent upon two criteria associated with clutch friction: “chatter” and “effectiveness.” “Chatter” is an undesirable noise which may occur during differential action. “Effectiveness” is a measure of the ability of the CSD clutches to transfer torque, during wheel slippage, to the wheel with the greater traction. The objective of this investigation was to definitely establish the cause of chatter, measure CSD effectiveness, and relate friction characteristics of lubricants to CSD operation.In tests with an instrumented car, it was found that both chatter and effectiveness are strongly influenced by the lubricant. Chatter occurred with lubricants that produced an increase in clutch friction with decreasing sliding speed. Chatter did not occur with lubricants containing friction modifiers which produced a decrease in clutch friction with decreasing sliding speed. Unfortunately, these friction modifiers also reduced the CSD effectiveness by reducing the clutch friction.To simulate CSD clutch plate sliding under more closely controlled laboratory conditions, the R-H Friction Apparatus was built. Results with this apparatus were correlated with those obtained with the car. Also, deterioration of CSD lubricant friction characteristics in car service was confirmed with the R-H Friction Apparatus.Controlled-slip differentials (CSD) improve car operation under wheel slipping conditions. The performance of CSD's is dependent upon two criteria associated with clutch friction: “chatter” and “effectiveness.” “Chatter” is an undesirable noise which may occur during differential action. “Effectiveness” is a measure of the ability of the CSD clutches to transfer torque, during wheel slippage, to the wheel with the greater traction. The objective of this investigation was to definitely establish the cause of chatter, measure CSD effectiveness, and relate friction characteristics of lubricants to CSD operation.In tests with an instrumented car, it was found that both chatter and effectiveness are strongly influenced by the lubricant. Chatter occurred with lubricants that produced an increase in clutch friction with decreasing sliding speed. Chatter did not occur with lubricants containing friction modifiers which produced a decrease in clutch friction with decreasing sliding speed. Unfortunately, these friction modifiers also reduced the CSD effectiveness by reducing the clutch friction.To simulate CSD clutch plate sliding under more closely controlled laboratory conditions, the R-H Friction Apparatus was built. Results with this apparatus were correlated with those obtained with the car. Also, deterioration of CSD lubricant friction characteristics in car service was confirmed with the R-H Friction Apparatus.
Friction Characteristics of Controlled-Slip Differential Lubricants
Sae Technical Papers
National Fuels and Lubricants and Transportation Meetings ; 1966
1966-02-01
Conference paper
English
Lubricants for Limited Slip Differentials
SAE Technical Papers | 1966
|The effect of solid lubricants on friction characteristics
Automotive engineering | 1998
|The Effect of Solid Lubricants on Friction Characteristics
SAE Technical Papers | 1998
|Solid lubricants ease friction problems
Automotive engineering | 1980
Experimental Analysis of Wear and Friction Characteristics of Jatropha Oil Added Lubricants
British Library Conference Proceedings | 2012
|