Abstract
Friction and wear characteristics of cam and follower lubricated with soot contaminated oils were examined with a cam-follower test rig. Changes in friction force and amount of wear were measured during the course of the tests. The influence of the soot was examined by mixing the exhaust gas soot or the carbon black into the oils blended with the dispersant and ZnDTP and/or MoDTC additives. Results are summarized as follows. (1) The friction fluctuated and gradually increased with elapse of time in case of soot contaminated oils. (2) Under the coexistence of ZnDTP and MoDTC, however, it became a gradual decrease lower in friction even if mediated with the soot. (3) The wear rate became the smallest as if the anti-wear effect of ZnDTP was kept due to the MoDTC. (4) Such characteristics were not always reproduced by the carbon black contamination.
