06-02-2016, 04:41 PM
ABSTRACT
Casting technology procedures which had been developed for composition 201 and 224 aluminum alloys under Phase 1 of this project were utilized to sand cast transmission cases and clutch covers of a 2½-ton vehicle. Endurance testing of these components, together with standard cast iron components, revealed that cast aluminum components had a better heat-rejecting capability as compared to cast iron components.Furthermore, composition 224 aluminum alloy transmission assembly had better temperature-lowering characteristics (5.1 0 F) than that of composition 201 transmission assembly. The mean operating temperature for a standard transmission was 301.4 0 F; for the 201 transmission,it was 298.80F and for the 224 transmission, it was 293.7 0 F. It was also determined that at these operating temperatures stability of OE-50 lubricant was better than GO-90 lubricant. Durability of both aluminum transmissions were better than for standard cast iron transmissions.