STUDY ON LIMITING LOAD FOR SCUFFING AND SPECIFIC WEAR OF SPUR GEARS -(EFFECTS OF LUBRICATING OIL AND TOOTH FORM)

Limiting load for scuffing using spur gears, which were case-hardened and ground, was investigated. The load was stepped up according to the provided load stage in our experiments to the load stage of scuffing failure. Before and after the running of test gears, the wear of test gears was measured with a balance. At first the running time of test g ears at each load stage varied very widely and we found that the runni ng time at each load stage has no influence on the limiting load for s cuffing. For our experiments four kinds of base oil viscosity were use d. As antiscuffing additives ZDTP and EP additives at various concentr ations were used. Influences of lubricating oil viscosity and concentr ation of ZDTP and EP additive on limiting load for scuffing and specif ic wear were investigated and the results summarized. Furthermore the integral temperature of tooth surface according to the ISO proposal wa s illustrated and discussed.