To improve the service life of newly designed pneumatic downhole motor, a kind commercially available lithium complex grease was used to help avoid rapid wear-induced failure dynamic seal tools in operation. The investigation on tribological behaviors QBe2 beryllium bronze and 38CrMoAlA steel tribo-pairs motor revealed that under lubrication, instantaneous friction coefficient wear volume becam...

Abstract. This paper is the first in a two-part study on lubrication wind turbine main bearings. Elastohydrodynamic complex field, formulas and results from which should not be applied blindly, but with proper awareness consideration of their context, validity limitations any given case. The current paper, “Part 1”, therefore presents an introductory review elastohydrodynamic theory order to pr...

The search for biobased material as industrial and automotive lubricants has accelerated in recent years. This trend is primarily due to the nontoxic and biodegradable characteristics of seed oils that can substitute mineral oil as base fluid in grease making. The paper discusses the preparation of lithium soap-based soy greases using different fatty acids and the determination of crystallite s...

Lubrication is widely used to reduce wear of wheel and rail profiles by decreasing the friction between flange rail. The effects lubrication on dynamic response were investigated in this study, analysing responses adjoining bearing housing. experiments conducted a 1/3rd scale twin disc rig, with single disc, which can have various speeds, loads creepage. First, theoretical modal parameters calc...

Axial thermal deformation and axial stiffness are the leading technical indicators affecting face-grinding spindle manufacturing accuracy. However, supported by rolling bearings lubricated with grease has a disadvantage regarding temperature rise, stiffness, rotational To overcome this issue, study proposes novel combined bearings, which include water-lubricated hydrostatic thrust bearing two a...

The analysis of grease-lubricaled rolling element bearings i s presented. Exferimen tally determined flow curaes for grease are found to be well correlated by the Herschel-Bdkley model flow eqzration. A theory for predicting roller Jilm thickness based on the assumed flow model i s derived. Experimental results show that grease will deveIop a larger film lhickness lhan the grease base oil at ji...