A method for inspecting a lubricant oil composition containing a base oil and a fullerene, the method including: measuring at least one of a lamellar length of the lubricating oil composition and a most abundant diameter in a particle size distribution obtained by a dynamic light scattering method, and selecting the lubricating oil composition whose measured value is within a set range.

Provided is a refrigerating machine oil composition for a mixed refrigerant comprising difluoromethane, the composition comprising a polymer (A) below and an ester (B) of polyhydric alcohol(s) with aliphatic monocarboxylic acid(s). The polymer (A): a polymer which is obtained by polymerizing monomer(s) consisting of at least one monomer of monosubstituted ethylenes and disubstituted ethylenes, and in which a ratio of a monomer represented by the following general formula (I): ##STR00001##
wherein R.sup.1 represents an alkyl group having 1 to 14 carbon atoms, R.sup.2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and the sum of carbon numbers in R.sup.1 and R.sup.2 is 2 to 14, is 75 to 100% by mass based on a total mass of monomers constituting the polymer.

Provided is a refrigerating machine oil composition for a mixed refrigerant comprising difluoromethane, the composition comprising a polymer (A) below and an ester (B) of polyhydric alcohol(s) with aliphatic monocarboxylic acid(s). The polymer (A): a polymer which is obtained by polymerizing monomer(s) consisting of at least one monomer of monosubstituted ethylenes and disubstituted ethylenes, and in which a ratio of a monomer represented by the following general formula (I): ##STR00001##
wherein R.sup.1 represents an alkyl group having 1 to 14 carbon atoms, R.sup.2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and the sum of carbon numbers in R.sup.1 and R.sup.2 is 2 to 14, is 75 to 100% by mass based on a total mass of monomers constituting the polymer.

A lubricant composition is described. The novel lubricant composition has superior thermal stability, and can reduce the need to replenish the lubricant. The lubricant composition includes at least a soap component, a thickener component, an oil component, and a spherical polyolefin component (optionally Microthene). The spherical polyolefin component includes polyolefin microparticles.

A lubricant composition is described. The novel lubricant composition has superior thermal stability, and can reduce the need to replenish the lubricant. The lubricant composition includes at least a soap component, a thickener component, an oil component, and a spherical polyolefin component (optionally Microthene). The spherical polyolefin component includes polyolefin microparticles.

The present invention provides an electrorheological fluid, which includes a dielectric particle, a conductor particle and insulating oil, and the dielectric particle is evenly dispersed in the insulating oil; wherein the conductor particle is evenly dispersed in the insulating oil or inlaid in an interior and on a surface of the dielectric particle. The electrorheological fluid has the advantages of high shear stress, long service life, good temperature stability and small leakage current.

The present invention provides an electrorheological fluid, which includes a dielectric particle, a conductor particle and insulating oil, and the dielectric particle is evenly dispersed in the insulating oil; wherein the conductor particle is evenly dispersed in the insulating oil or inlaid in an interior and on a surface of the dielectric particle. The electrorheological fluid has the advantages of high shear stress, long service life, good temperature stability and small leakage current.

The invention describes a traction drive fluid that comprising a carrier and a particulate solid. The carrier has a boiling point of greater than at least about 100 C., and a melting point of below about 10 C., both being measured at 1 atm pressure. The particulate solid consists of a plurality of laminae. The laminae are homogeneously distributed through the carrier.

The present disclosure provides a formulated conductive grease for an associated bearing that can be used in a drive system, such as a variable frequency drive system for motors having a formulation sufficient to reduce the voltage build up that causes damaging electric discharge machining (EDM) on rotational bearing supported surfaces, such as inner and outer races, while still maintaining a grease composition suitable for bearing long life at operational temperatures. The higher conductivity of the inventive grease results in lowering of the threshold voltage of pulse discharges, which consequently decreases the energy release in each pulse and the resulting bearing temperatures, avoiding bearing damage. The disclosure further provides a bearing lifetime prediction model given typical discharge conditions from both Si and SiC inverters using a bearing state of health (SOH) metric.

The present disclosure provides a formulated conductive grease for an associated bearing that can be used in a drive system, such as a variable frequency drive system for motors having a formulation sufficient to reduce the voltage build up that causes damaging electric discharge machining (EDM) on rotational bearing supported surfaces, such as inner and outer races, while still maintaining a grease composition suitable for bearing long life at operational temperatures. The higher conductivity of the inventive grease results in lowering of the threshold voltage of pulse discharges, which consequently decreases the energy release in each pulse and the resulting bearing temperatures, avoiding bearing damage. The disclosure further provides a bearing lifetime prediction model given typical discharge conditions from both Si and SiC inverters using a bearing state of health (SOH) metric.