The shiftability of manual transmissions is known to be strongly affected by the nature of the transmission oil. When conventional sulphur-phosphorus (SP) additives are used in the oil, gear clashing, sticking, and other problems occur. As reported previously, these problems are caused mainly by the polysulphide used in the SP additives. This paper reports on a study of the effect of the structure of the poly sulphide's hydro-carbon chain on the synchromesh characteristics. It is found that poly sulphides with long hydrocarbon chains have high kinematic friction coefficients and low static friction coefficients. It is also shown that this phenomenon occurs because of the adsorption of the polysulphide on to the copper alloy of which the gear synchroniser ring is made. By using a polysulphide with a long hydrocarbon chain it is possible to develop transmission oils that have superior load-carrying capacity and better shiftability even when compared with the latest transmission oils that contain metallic detergents.
Influence of the structure of polysulphide additives on the shiftability of manual transmissions
Lubrication Science ; 15 , 2 ; 133-145
2003
13 Seiten, 5 Quellen
Aufsatz (Zeitschrift)
Englisch
Manual Transmissions and transaxles
TIBKAT | 1990
|Numerical modelling of a bromide–polysulphide redox flow battery
Online Contents | 2009
|AUTOMATIC TRANSMISSIONS-MANUAL CONTROL SEQUENCE
SAE Technical Papers | 1988
Automatic Transmissions - Manual Control Sequence
SAE Technical Papers | 2017