TY - JOUR
T1 - Resonance shear measurement on lubrication properties of engine oils
T2 - Effects of additives
AU - Shibazaki, Shogo
AU - Mizukami, Masashi
AU - Yoshida, Sae
AU - Yanagimachi, Takuya
AU - Tanabe, Tadao
AU - Kurihara, Kazue
PY - 2018
Y1 - 2018
N2 - We investigated properties of lubricants confined between mica surfaces using resonance shear measurement (RSM) which can monitor the rheological and tribological properties of the lubricants as a function of the surface separation distance (D) as well as the normal load (L). The formulations of the five lubricants investigated were; oil A (mineral oil + viscosity modifier (VM) + Antiwear additive + Metallic detergent + Ashless dispersant + Anti-oxidant + Foam inhibitor), oil B (oil A + Molybdenum dithiocarbamate (MoDTC)), oil-C (oil A + Glycerol monooleate (GMO), oil D (mineral oil + viscosity modifier (VM)), and oil E (mineral oil only). The oil E showed the friction coefficient (p) of 0.45 at the normal load (I) below 2.0 mN. The oil D, which contained VM, showed significant decrease in the n value to 0.19. In the case of oil A, B, C, the thickness of lubricant layers became significantly thicker than those of oil E and D, however, the no clear reduction in the jj value compared with oil D was observed. These results have demonstrated that the RSM can evaluate the contribution of the each component on the lubrication in order to optimize their properties and performance.
AB - We investigated properties of lubricants confined between mica surfaces using resonance shear measurement (RSM) which can monitor the rheological and tribological properties of the lubricants as a function of the surface separation distance (D) as well as the normal load (L). The formulations of the five lubricants investigated were; oil A (mineral oil + viscosity modifier (VM) + Antiwear additive + Metallic detergent + Ashless dispersant + Anti-oxidant + Foam inhibitor), oil B (oil A + Molybdenum dithiocarbamate (MoDTC)), oil-C (oil A + Glycerol monooleate (GMO), oil D (mineral oil + viscosity modifier (VM)), and oil E (mineral oil only). The oil E showed the friction coefficient (p) of 0.45 at the normal load (I) below 2.0 mN. The oil D, which contained VM, showed significant decrease in the n value to 0.19. In the case of oil A, B, C, the thickness of lubricant layers became significantly thicker than those of oil E and D, however, the no clear reduction in the jj value compared with oil D was observed. These results have demonstrated that the RSM can evaluate the contribution of the each component on the lubrication in order to optimize their properties and performance.
KW - Additive
KW - Engine oil
KW - Friction
KW - Hard wall thickness
KW - Resonance shear measurement (RSM)
KW - Viscosity
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M3 - Article
AN - SCOPUS:85049687787
VL - 63
SP - 284
EP - 293
JO - Toraibarojisuto/Journal of Japanese Society of Tribologists
JF - Toraibarojisuto/Journal of Japanese Society of Tribologists
SN - 0915-1168
IS - 4
ER -