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research-article

Influence of Centrifugal Forces on Oil Flow in Journal Bearing of Planetary Gear

[+] Author and Article Information
Mikhail Y Temis

Central Institute of Aviation Motors, Bauman Moscow State Technological University, 2, Aviamotornaya st., Moscow, Russia, 111116
mikhail.temis@gmail.com

Alexander Lazarev

Central Institute of Aviation Motors, Bauman Moscow State Technological University, 2, Aviamotornaya st., Moscow, Russia, 111116
lytlazarev@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4037982 History: Received August 20, 2016; Revised August 26, 2017

Abstract

Mathematical model of oil flow in fluid film bearing in field of centrifugal forces is developed. Centrifugal forces for planet wheel bearing sliding surfaces and oil gap are formulated. This model is based on modification of two-dimensional Reynolds equation taking into account inertia centrifugal forces for oil film. Required modification of Reynolds equation is received from Navier-Stokes and continuity equations taking into account centrifugal forces acting on planet wheel bearing. Modified 2D Reynolds equation is solved numerically using finite-element discretization. Developed mathematical model, based on modified Reynolds equation, is verificated at comparison with solution of full Navier-Stokes equations system obtained in commercial software package. Results for pressure distribution in bearing with fixed axis and in planet wheel bearing are received and compared. The sufficient influence of centrifugal inertia forces in oil layer of planet wheel bearing on pressure distribution, bearing carrying force and attitude angle is shown for specific shaft journal eccentricity ratio, eccentricity direction and rotation velocity.

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