What is squeeze film bearing?
What is squeeze film bearing?
Squeeze-film bearings are a special case of hydrodynamic bearings. This type of bearing consists of a conventional rolling-element bearing and an external structure for damping radial motion. The outer race of the rolling-element bearing is surrounded by a damper casing.
What is meant by hydrostatic bearing?
Hydrostatic bearings are externally pressurized fluid bearings, where the fluid is usually oil, water or air, and is pressurized by a pump. Hydrodynamic bearings rely on the high speed of the journal (the part of the shaft resting on the fluid) to pressurize the fluid in a wedge between the faces.
What are the advantages and disadvantages of hydrostatic bearings over hydrodynamic bearings?
Hydrostatic Bearing
| Advantages | Disadvantages |
|---|---|
| Load does not depend on film thickness or lubricant viscosity. | Need of fluid filtration equipment. Loss of performance with fluid contamination. |
| Long life (infinite in theory) without wear on surfaces. | High power consumption because of pumping losses. |
Where is hydrostatic bearing used?
Hydrostatic bearings are used in a wide range of applications – from small spindles and guideways (millimetres) to large-scale turntables, machining centres, space telescopes, and antennas, etc.. The methodology of hydrostatic bearing design is well described in the book by Bassani and Piccigallo [1].
Where hydrodynamic bearings are used?
Hydrodynamic bearings are commonly used in large turbines, generators, compressors, gearboxes and pumps in the power generation and oil, gas and chemical processing industries.
What is pivot bearing?
Pivot bearings are frictionless bearings that are suitable for pivotal, angular, or oscillating applications. A cantilevered pivot bearing is a commonly used type of pivot bearing for applications such as: gimbal rings. mirror mounts.
What is the difference between journal bearing and ball bearing?
Journal bearings are more capable of managing shock and overload compared with ball and roller bearings. They are also less prone to fatigue. They can run quieter than rolling-element bearings, especially when the rolling-element bearings begin to wear.
What is the difference between hydrodynamic and hydrostatic lubrication?
Hydrostatic lubrication depends on the inlet pressure of lube oil and clearance between the metal surfaces, whereas in hydrodynamic lubrication it depends on the relative speed between the surfaces, oil viscosity, load on the surfaces, and clearance between the moving surfaces.
How does a squeeze film damper bearing work?
A squeeze film damper bearing (100) has the means of automatically centering itself from the force associated with lateral shaft vibration. It utilizes a floating ring (108) positioned between a housing (102) and a cage (106) with O-rings (115, 116, 130, 131) positioned between adjacent parts to maintain proper clearances.
What is the country status of self-centering squeeze film damper bearing?
Self-centering squeeze film damper bearing Country Status (1) Country Link US(1) US5215384A(en) Cited By (43) * Cited by examiner, † Cited by third party Publication number Priority date Publication date Assignee Title US5651616A(en) * 1996-10-17 1997-07-29 Dresser-Rand Company
What is Squeeze Film damping?
Squeeze film damping action takes place when the oil is squeezed out of this clearance region as the cage assembly vibrates in the lateral direction. The damper cage 16 imparts the optimum amount of damping to the rotor system 36 when it oscillates about the center position 36.
When did Hitachi start making damped bearings?
1983-07-12 Hitachi, Ltd. Damped bearing device US4458843A(en) * 1981-06-03 1984-07-10 Thiokol Corporation Centering system for spherical bearings US4726694A(en) * 1987-05-26 1988-02-23 United Technologies Corporation Bearing arrangement US4782919A(en) * 1987-12-21 1988-11-08