Spiral groove bearings (also known as Rifle bearings) are self-acting (journal and thrust), or hydrodynamic bearings used to reduce friction and wear without the use of pressurized lubricants. They have this ability due to special patterns of grooves. Spiral groove bearings are self-acting because their own rotation builds up the pressure needed to separate the bearing surfaces. For this reason, they are also contactless bearings.
https://en.wikipedia.org/wiki/Spiral_groove_bearing
Flat thrust[edit]
Flat thrust bearings, the most common spiral groove bearings, are so named because one consists of a flat surface that opposes the grooved surface.
Variations in this type of bearing come from the nature of the spiral surface and the type of fluid flow. The following is a list of the different types of flat thrust bearings:
- With transverse flow
- Herringbone grooved, without transverse flow
- Partially grooved (inwardly or outwardly pumping)
- With constant restriction to transverse flow.
Spherical thrust[edit]
A spherical (or more usually a hemispherical) thrust bearing consists of a sphere that rotates concentrically in a spherical cup with groove patterns.
The image shows the grease lubricated spiral groove hemispherical bearing invented by Ron Woolley of the Gas Bearing Advisory Service at Southampton University in collaboration with British Gas.[6]
https://en.wikipedia.org/wiki/Spiral_groove_bearing#Flat_thrust
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