Development of the new Cu alloy bearing for higher load and longer life of future diesel engines

摘要

Basic stick-slip tests and alternating load tests under conditions closer to real operating conditions were performed with the purpose of developing engine bearing materials adequate for longer service lives and the higher load of diesel engines. Obtained results showed that Cu-Sn-Ag alloy material performed better than conventional lead-bronze alloy and showed its load carrying capacity to be 120 MPa and its life to be 10{sup}7 cycles. Also, bench tests performed by using a real engine showed that at a load carrying capacity of 80 MPa, Cu-Sn-Ag material had a life of more than 2.4 ×10{sup}8 cycles and could meet the requirements for higher normal pressure and longer service lives of future diesel engines. The reason for this ability to withstand higher normal pressure and a higher resistance to seizure of the alloy was the formation of some compounds related to Sn, Ag, and S on the sliding surface, the prevention of the adhesion, and the transfer of bearing lining material to the shaft under higher normal pressure conditions.