Fluid Film Bearing Manufacturing

24 Aug 2019 07:35
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Kingsbury's very popular brochure, General Guide To Hydrodynamic Bearings,” covers the background and invention of the tilting pad fluid film bearing, the types of fluid film bearings in common use and a comprehensive section on the diagnosis and troubleshooting of bearing problems. The interior bore 20 of the bushing 12 includes a plurality of anti-rotation devices or retainers 22 (shown as three, generally T-shaped retainers) which are equally spaced and extend the axial length of the interior bore 20. The retainers 22 divide the interior bore 20 of the bushing 12 into a like plurality of lobes 24. The compliant foils 16 and the foil undersprings 18 are disposed in each lobe 24 between adjacent generally T-shaped retainers 22.

2. A bearing as in claim 1 wherein said spring support is sectioned into at least two opposing sections each having a plurality of said spring bars, the spring bars of said opposing sections being interleaved and supported by said stationary ring assembly.

3. The compliant foil fluid film radial bearing of claim 1 wherein said interior bore is non-cylindrical, generally contoured lobes are formed between adjacent generally T-shaped tiliting pad retainers, and said individual compliant foils and said individual foil undersprings generally conform to the shape of said contoured lobes to establish a converging wedge.

In bearings of the first group, the radial clearance is predetermined according to a very precise and complex technological procedure based upon such factors as the velocity of the spindle, rigidity defined as a ratio of loading force to deformation, and heat generated, but primarily upon the skill and experience of the technician.

For example, combining directed lubrication with advanced material bearings — which are capable of handling thinner films, higher temperatures and therefore higher loads — can greatly reduce power loss compared to a flooded design with traditional bearing materials such as babbitt.

A quick study of the axial profile of the hydrodynamic pressure distribution for a grooved surface (insert), shown in Figure 4, demonstrates how any interruption of the smooth surface of the bearing in the load-carrying region will severely degrade the capacity of the bearing.

1. The fluid ports 56 of the ring assembly pass fluid directly to the squeeze film 61 through the annular stationary ring assembly 50. Just inside of the squeeze film cylinder are two annular fluid plenums 64 that receive fluid from fluid ports 62. Fluid in these plenums is contained by seals 66 and 68 that seat between the squeeze film cylinder and the spring support 20. These fluid plenums provide a reservoir of fluid that is supplied to a thin oil film 80 surrounding the journal bearing through fluid ports 70 in the spring support and the bearing sleeve.

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