Abstract
Measurements of the friction coefficient at the start-up and intermittent running tests at the room temperature (P=3 kg/cm2, N=24, 000rpm, PV= 1800 kg/cm2.m/min) were carried out for the sintered Cu-9/%Sn-0.4%P-3%%MoS2-0.5%C bearing (B061) for high speed revolution application trial-manufactured by the authors, in which Cu-P-Mo-S compounds (binder phase) are formed around the MoS2 particles, and compared with those obtained for the phosphorus-free bearing added only MoS2 to Cu-Sn base, Cu-9%Sn-3%MoS2 bearing (S60), and also for conventional Cu-9%Sn bearing (B 110).
Under the elevated temperature circumstances (80°C), continuous and intermittent running tests (P=3 kg/cm2, N=32, 000 rpm, PV=2400 kg/cm2-m/min) were also carried out for general evaluation of the trial-manufactured bearing as high speed revolution applications.
The results obtained were as follows;
1) With regard to the friction coefficient at the start-up, the value of S60 bearing was the lowest and the value of B061 bearing was slightly lower than that of B110 bearing. In the high speed intermittent running tests at the room temperature, however, B061 bearing revealed an excellent performance in comparison with S60 bearing.
2) In the continuous and intermittent running tests at the elevated temperature, in comparison with BI 10 bearing B061 bearing was superior in all items measured namely, the friction coefficients at the start-up and the regular state, the bearing temperature at the regular state, the rate of dissipation of lubricant oil, and the amount of wear of the bearings after the running tests.
