Characteristics of Herringbone-Grooved, Gas-Lubricated Journal Bearings

1965 ◽  
Vol 87 (3) ◽  
pp. 568-576 ◽  
Author(s):  
J. H. Vohr ◽  
C. Y. Chow
Keyword(s):  
Differential Equation ◽  
Journal Bearing ◽  
Groove Depth ◽  
Radial Force ◽  
Journal Bearings ◽  
Speed Ratio ◽  
Plain Bearing ◽  
Relative Speed ◽  
Whirl Speed ◽  
Limiting Case

A differential equation is obtained for the smoothed “overall” pressure distribution around a herringbone-grooved, gas-lubricated journal bearing operating with a variable film thickness. The equation is based on the limiting case of an idealized bearing for which the number of grooves approaches an infinite number. A numerical solution to the differential equation is obtained valid for small eccentricities. This solution includes the case where the journal is undergoing steady circular whirl. In addition to the usual plain bearing parameters L/D, Λ, and whirl speed ratio ω3/(ω1 + ω2), the behavior of a grooved bearing also depends on four additional parameters: The groove angle β, the relative groove width α, the relative groove depth H0, and a compressibility number, Λs, which is based on the relative speed between the grooved and smooth members of the bearing. Results are presented showing bearing radial force and attitude angle as functions of β, α, H0, Λs, Λ, and whirl speed ratio.

On the Optimum Groove Geometry for Herringbone Grooved Journal Bearings

2006 ◽  
Vol 128 (3) ◽  
pp. 585-593 ◽  
Author(s):  
A. M. Gad ◽  
M. M. Nemat-Alla ◽  
A. A. Khalil ◽  
A. M. Nasr
Keyword(s):  
Groove Depth ◽  
Radial Force ◽  
Journal Bearings ◽  
Friction Torque ◽  
Performance Characteristics ◽  
Width Ratio ◽  
Geometrical Parameters ◽  
Thrust Bearings ◽  
Circular Groove ◽  
Groove Profile

Recently, herringbone-grooved journal bearings have had important applications in miniature rotating machines. The scribed grooves, on either the rotating or stationary member of the bearing, can pump the lubricant inward, which generates supporting stiffness and improves the dynamic stability, especially for concentric operation. Most of the previous investigations that dealt with herringbone grooved journal bearings and grooved thrust bearings were theoretical. Few experimental attempts for the investigation of the performance characteristics of herringbone grooved journal bearings (HGJBs) and grooved thrust bearings have been done. All these investigations concentrated on rectangular and circular groove profiles of HGJBs. In order to improve the performance characteristics of HGJBs, a new design of the groove profile, the beveled-step groove profile, is introduced. The introduced groove profile is capable of increasing the pressure recovery at the divergence of the flow over the step. In addition, it increases the amount of oil pumped inward over the circular groove profile. Optimization processes were carried out experimentally, in order to obtain the optimal geometry of the introduced groove profile. The optimum geometrical parameters of the groove (groove angle α, groove width ratio β, and groove depth ratio Γ) are 29deg, 0.5, and 2.0, respectively, which give maximum radial force and maximum radial stiffness of the beveled-step HGJB. In order to check the effectiveness of the introduced beveled-step groove profile, the obtained results were compared with that for rectangular groove profile. The comparison shows that the introduced beveled-step HGJBs have higher radial force, higher load carrying capacity, and lower friction torque than the rectangular HGJBs.

Analysis of Gas-Lubricated Foil Journal Bearings

1983 ◽  
Vol 105 (4) ◽  
pp. 647-655 ◽  
Author(s):  
H. Heshmat ◽  
J. A. Walowit ◽  
O. Pinkus
Keyword(s):  
Differential Equation ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Bearing Surface ◽  
Operational Parameters ◽  
Operational Variables ◽  
Bearing Behavior ◽  
Load Angle ◽  
Gas Journal Bearing ◽  
Selection Of

This work is concerned with an evaluation of the performance of a gas journal bearing using a spring supported compliant foil as the bearing surface. The analysis, conducted for both single and multipad configurations, is concerned with the effects that the various structural, geometric, and operational variables have on bearing behavior. Following the solution of the relevant differential equation, tabular or graphical solutions are provided for a range of relevant geometric and operational parameters. The solutions include values of the colinear and cross-coupled spring coefficients due to both structural and hydrodynamic stiffness. Desirable design features with regard to start of bearing arc, selection of load angle, number of pads and degree of compliance are discussed.

Static and Dynamic Properties of Partial Journal Bearings

1963 ◽  
Vol 85 (2) ◽  
pp. 247-255 ◽  
Author(s):  
Paul C. Warner
Keyword(s):  
Differential Equation ◽  
Journal Bearing ◽  
Dynamic Properties ◽  
Journal Bearings ◽  
Wide Range ◽  
Governing Differential Equation

The liquid lubricated partial journal bearing is analyzed in an approximate yet accurate manner in order to obtain its static and dynamic properties. The solution of the governing differential equation is analytical rather than numerical, permitting inexpensive computation of results over a very wide range of the parameters involved.

A Sommerfeld Solution for Finite Bearings With Circumferential Grooves

1960 ◽  
Vol 82 (2) ◽  
pp. 321-326 ◽  
Author(s):  
J. V. Fedor
Keyword(s):  
Differential Equation ◽  
Excellent Agreement ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Algebraic Complexity ◽  
Eccentricity Ratio ◽  
Finite Form ◽  
Oil Film ◽  
Method Of Solution ◽  
Friction Curve

A method of solution is developed that circumvents the algebraic complexity in the solution of Reynolds differential equation applied to full journal bearings. The method leads to equations for journal-bearing characteristics that are in finite form. Salient features of the complete-oil-film solution are: As the eccentricity ratio b approaches 1, the load capacities of all finite bearings approach that of the infinite bearing; also, the friction curve intercept, (r/c)f, is 1 for all finite bearings when b equals 1. Results are compared with calculated values published by Muskat and Morgan for 0 < b < 0.6. Excellent agreement is found throughout the compared range.

Temperature rise of journal bearing of the high-speed circular arc gear pump

2019 ◽  
Vol 234 (8) ◽  
pp. 1492-1499
Author(s):  
Yang Zhou ◽  
Yuan Ci
Keyword(s):  
Temperature Rise ◽  
High Speed ◽  
Journal Bearing ◽  
Radial Force ◽  
Calculation Model ◽  
Journal Bearings ◽  
Gear Pump ◽  
Accurate Calculation ◽  
Circular Arc ◽  
Herringbone Grooves

A “circular arc–involute–circular arc” circular arc gear pump was developed based on a gear meshing principle and coordinate transformation as well as an accurate calculation model of the radial force. The dependence of the radial force on the meshing angle was investigated. The temperature rise of journal bearings in the pump was evaluated for bearings with and without herringbone grooves. Furthermore, the influence of the rotational speed and outlet pressure on this rise was assessed. The results revealed using herringbone groove on the inner wall of bearing was effective in reducing the temperature increase. Therefore, the use of grooves represents a suitable method of reducing the temperature rise in the journal bearings of a high-speed gear pump.

Determination of the Integration Constant for Squeeze Films in Infinitely Long Journal Bearings

1970 ◽  
Vol 92 (1) ◽  
pp. 179-180
Author(s):  
D. C. Kuzma
Keyword(s):  
Arbitrary Constant ◽  
Journal Bearing ◽  
Load Capacity ◽  
Journal Bearings ◽  
Integration Constant ◽  
Squeeze Film ◽  
Positive Pressure ◽  
Limiting Case

The complete film solution for the squeeze film in an infinitely long journal bearing contains an arbitrary constant. When only positive pressure regions are retained, this constant influences the load capacity. Several different values have been used for this constant. Its value is determined here so that the infinitely long journal bearing is the limiting case of the finite journal bearing.

Considerations Regarding the Analytical Solution of Journal Bearing Lubrication

2005 ◽  
Author(s):  
Mihail G. Ionescu ◽  
Vladimir-Codrin M. Ionescu
Keyword(s):  
Differential Equation ◽  
Analytical Solution ◽  
Journal Bearing ◽  
Quantitative Estimation ◽  
Journal Bearings

The paper makes a succinct analysis of the advantages and limitations of the differential equation for pressures proposed by Ionescu [1]. The main theoretical and experimental aspects concerning the quantitative estimation of journal bearings are briefly presented. A variant of the equation ensuring calculation accuracy for lightly loaded bearings is proposed.

scholarly journals The design and analysis of a high-speed circular arc gear pump journal bearing

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881928 ◽  
Author(s):  
Yang Zhou ◽  
Bowen Che ◽  
Ci Yuan
Keyword(s):  
High Speed ◽  
Failure Modes ◽  
Journal Bearing ◽  
Radial Force ◽  
Journal Bearings ◽  
Gear Pump ◽  
Circular Arc

A series of problems arise when a gear pump operates at high speed, including instability of the rotor, deformation of the chamber, and wear of the journal bearing. Among all failure modes, journal bearing wear is the most serious. The wear of journal bearings of a circular arc gear pump that operates at high speed is thus presented in this article. A journal bearing that offsets the unbalanced radial force is designed by analysis of the fluid and determination of eccentricity of the gear shaft. Experiments show that the wear of the new journal bearing is effectively reduced.

scholarly journals The Prediction of Liquid Film Journal Bearing Performance with a Consideration of Lubricant Film Reformation: Part 2: Experimental Results

1985 ◽  
Vol 199 (2) ◽  
pp. 103-111 ◽  
Author(s):  
D Dowson ◽  
C M Taylor ◽  
A A S Miranda
Keyword(s):  
Experimental Investigation ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Lubricant Film ◽  
Plain Bearing ◽  
Operating Characteristics ◽  
Design Data ◽  
Cavitation Region ◽  
Satisfactory Prediction ◽  
Theoretical Results

Analyses and design data for plain journal bearings rarely take into account the phenomenon of film reformation. The consideration of the re-establishment of the lubricant film after the cavitation region is difficult in a number of ways. The importance of allowing for reformation is, however, being increasingly recognized. This is particularly true as regards the satisfactory prediction of lubricant flowrate and the thermal operating characteristics of a bearing. The authors have previously implemented a cavitation algorithm to enable the cavitation region in a plain journal bearing to be located automatically and efficiently in a computer analysis. In Part I of the present paper theoretical results have been presented for the case of a plain bearing with a square-ended, axial groove located at the position of maximum film thickness. The second part of the paper gives details of an experimental investigation designed to establish the validity of the analysis.

scholarly journals Structural Design and Optimization of Herringbone Grooved Journal Bearings Considering Turbulent

2022 ◽  
Vol 12 (1) ◽  
pp. 485
Author(s):  
Xichun Liu ◽  
Wei Chen
Keyword(s):  
Liquid Metal ◽  
High Performance ◽  
Journal Bearing ◽  
Structural Parameters ◽  
Constant Width ◽  
Dynamic Performance ◽  
Helix Angle ◽  
Groove Depth ◽  
Journal Bearings ◽  
Design And Optimization

In order to improve the performance of the traditional constant-width herringbone grooved journal bearing in a computed tomography tube under a high-temperature environment, the present study designed a convergent herringbone grooved journal bearing (HGJB) structure lubricated by liquid metal. The bearing oil film thickness and the Reynolds equation considering the influence of turbulence are established and solved by using the finite difference method in the oblique coordinate system. The performance of the two bearings was compared, and the static and dynamic performance change trends of the two bearing structures under different eccentricities were systematically studied. The results show that the convergent herringbone grooved journal bearings are superior to the constant-width herringbone grooved journal bearings in terms of bearing capacity and stiffness coefficient. At the same time, the influence of structural parameters, such as the number of grooves, helix angle, groove to ridge ratio, groove depth on the performance of the constant-width herringbone grooved journal bearings, and the convergent herringbone grooved journal bearings was studied. Finally, we conclude that the performance of the convergent herringbone grooved journal bearings is optimal when the number of grooves is 15–20, the helix angle is 30–45°, the ratio of the groove to ridge is 1, and the groove depth is 0.02 mm −0.024 mm. This research has provided the thinking and reference basis for the design of liquid metal bearings for high-performance CT equipment.

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