Wear Behaviour of Synchronisers in Relation to a Duty Parameter

Thermomechanical performance of carbon fiber reinforced polymer synchronizer friction liners

“…Additionally, the wear rate increases due to decreased hardness at elevated temperatures. Lösche et al 9 experimentally investigated the wear behavior of molybdenum coated synchronizer, and found good correlation with a “duty parameter” which was hypothesized to represent the contact surface temperature. Spreckels 10 found a correlation between contact surface temperature and the onset of severe wear for molybdenum synchronizers.…”

Optimization of synchronizer cone angle with regard to manufacturing tolerances of cone roundness and cone angle

“…3 With focal temperature, we here refer to the 'hot-spots' that are caused by low-order thermomechanical effects between conforming bodies in sliding contact, see, for example, Barber 4 and Yi et al 5 Kinugasa et al 6 showed that brass synchronizers saw an increased risk of clashing as well as an increased wear rate at a focal contact temperature over 180°C and attributed that to decreased hardness in the material. Lo¨sche et al 7 experimentally investigated the wear of molybdenum synchronizers and developed a semi-empirical wear model using a 'duty parameter' based on sliding speed, contact pressure and rotational energy. It was hypothesized that this 'duty parameter' represents the average surface temperature.…”