Static Characteristics of Low Speed Cylindrical Journal Bearings of the Rope Wheel of Hoist Tower

2005 ◽  
Author(s):  
S. Strzelecki ◽  
W. Wojcicki ◽  
W. Famulski
Keyword(s):  
Load Capacity ◽  
Journal Bearings ◽  
Static Characteristics ◽  
Rolling Bearings ◽  
Oil Film ◽  
Low Speed ◽  
Oil Flow ◽  
Bearing Design ◽  
Bearing System ◽  
Oil Film Pressure

The design solutions of bearings carrying the shafts of rope wheels on the hoist tower of coal mines consists the rolling bearings or plain journal ones. Plain journal bearings allow for easy assembling and for smooth operation without vibrations. Static characteristics of journal bearings consist of oil film pressure and temperature distributions, static equilibrium position angles, load capacity, oil flow and power loss and their knowledge is the basis of bearing design. The paper comprises the static characteristics of low speed cylindrical journal bearings that are applied in the bearing system of the rope wheels of hoist tower. The calculations of these characteristics were carried-out on the assumption of adiabatic oil film.

Stability of Jeffcott Rotor Operating in Tilting 3-Pad Journal Bearings with Turbulent Oil Film

2009 ◽  
Vol 147-149 ◽  
pp. 450-455
Author(s):  
Stanislaw Strzelecki ◽  
Sobhy M. Ghoneam
Keyword(s):  
Theoretical Investigation ◽  
Dynamic Characteristics ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Oil Film ◽  
Temperature Distributions ◽  
Jeffcott Rotor ◽  
Oil Flow ◽  
The Stability ◽  
Oil Film Pressure

This paper introduces the results of theoretical investigation on the dynamic characteristics of tilting 3-pad journal bearing that operates with turbulent oil film. The Reynolds, energy, viscosity and geometry equations determine the oil film pressure, temperature distributions, and oil film resultant force that are the grounds for the dynamic characteristics of bearing. These equations were solved simultaneously on the assumption of adiabatic laminar or adiabatic turbulent oil flow in the bearing gap. The stability and system damping of Jeffcott rotor operating in tilting 3-pad journal bearing was determined.

scholarly journals The effect of oil feeding type and oil grade on the oil film bearing capacity

2021 ◽  
Vol 23 (2) ◽  
pp. 381-386
Author(s):  
Aleksander Mazurkow ◽  
Waldemar Witkowski ◽  
Adam Kalina ◽  
Bartłomiej Wierzba ◽  
Mariusz Oleksy
Keyword(s):  
Bearing Capacity ◽  
Journal Bearings ◽  
Maximum Temperature ◽  
Maximum Pressure ◽  
Static Characteristics ◽  
Oil Film ◽  
Feeding Type ◽  
Oil Flow ◽  
Minimum Height ◽  
Face Side

Two types of hydrodynamically lubricated plain journal bearings were subject to examination differing in the method used to feed them with oil. The first type was fed from a lubrication pocket and the second from the bearing face side. Mathematical models were developed with two-way oil flow allowing to determine the oil film bearing capacity, the maximum pressure, the maximum temperature, and the film oil minimum height for given position of journal relative to solid bush. Static characteristics were developed used in the further course of the study to compare operating parameters of the considered types of bearings. Another issue considered in the paper is the effect of oil VG grade on bearing performance with conditions of oil feeding taken into account and results of the research presented.

THE EFFECT OF HELICAL GROOVE PRESENCE ON THE TRIBOLOGICAL PERFORMANCE OF JOURNAL BEARINGS

Tribologia ◽  
2018 ◽  
Vol 279 (3) ◽  
pp. 131-138
Author(s):  
Jarosław SĘP ◽  
Leszek TOMCZEWSKI ◽  
Lidia GAŁDA
Keyword(s):  
Load Capacity ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Equation System ◽  
Journal Bearings ◽  
Operating Conditions ◽  
Static Characteristics ◽  
Hydrodynamic Bearings ◽  
Oil Flow ◽  
Helical Groove

The hydrodynamic bearings could suffer critical damages operating in contaminated environments that cause machine breakdown. In such hard operating conditions, hydrodynamic bearings with grooved journals are less sensitive to damage compared to plain bearings. The wear resistance of the grooved journal bearings is several times greater than that of smooth journal bearings. Contaminants existing in the oil film are moved out from the bearing clearance by the groove created on the journal surface. The presence, shape, and geometry of the groove strongly influence the bearings performance. The aim of this article is to study the selected static characteristics of bearings consisting of a journal with the helical groove on its surface. The static characteristics were determined based on the flow simulation in the oil clearance. A three-dimensional, adiabatic model of the oil flow was assumed. The oil flow was described with the Navier-Stokes continuity and energy equations. The equation system was solved by the finite volume method. The numerical model of the flow was verified experimentally on a test stand. It has been established that the grooved journal application leads to a decrease of load capacity in whole range of eccentricity and for all examined clearances. The oil flow rate increase was mainly observed due to spiral groove presence on the shaft.

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