Foil air bearing design and installation guide

Foil Thrust Air Bearing

OAV Foil Thrust Air Bearings have four pin-slots along the outer perimeter. The base plate of the bearing housing is where the OAV Foil Thrust Air Bearing will be mounted on with precision dowel pins. 

Foil Thrust Air Bearing Design Guide

The base plate, bearing housing, and the OAV Foil Thrust Air Bearing and all related components should be cleaned using only isopropyl alcohol to remove impurities and dust particles.

The OAV Foil Thrust Air Bearing is then light press-fitted on the dowel pins of the base plate to firmly mount the bearing at its position.

Foil Thrust Air Bearing Design Guide

The shaft should easily pass through the inner diameter of the OAV Foil Thrust Air Bearing. However, there should be an axial clearance of 7.5-12.5 microns between the top foil of the thrust bearing and the Runner (thrust disc).

Foil Thrust Air Bearing Design Guide
Foil Thrust Air Bearing Design Guide

To avoid thrust reversal, it is recommended to use two foil thrust bearings (1 CW + 1 CCW) on each side of the Runner (thrust disc) if possible.

CW and CWW directions shown below.

Foil Thrust Air Bearing
Foil Thrust Air Bearing

Foil Journal Air Bearing

OAV Foil Journal Air Bearings have precision outer diameter and should be transition fitted into the housing as needed. If the base plate must be used, use either dowel pins, threaded screws, or both as shown in the figure below to secure the bearings with a light press-fit.

OAV Foil Journal Air Bearing Design Guide

The base plate, bearing housing, and the OAV Foil Journal Air Bearing and all related components should be cleaned using only isopropyl alcohol to remove impurities and dust particles.

The OAV Foil Journal Air Bearing is then light press-fitted on the dowel pins of the base plate, as shown below, to firmly mount the bearing at its position.

OAV Foil Journal Air Bearing Design Guide

Threaded screws may also be used to fix the bearing at its position inside the bearing housing, as shown in the figure below.

OAV Foil Journal Air Bearing Design Guide

The OAV Foil Journal Air Bearing may also be mounted to the bearing housing maintaining a H7g6  transition fit between the two components.

OAV Foil Journal Air Bearing Design Guide
OAV Foil Journal Air Bearing Design Guide

OAV Foil Journal Air Bearings and all related components should be cleaned using only isopropyl alcohol to remove impurities and dust particles.The OAV Foil Journal Air Bearing should easily slide through the rotor, as shown in the figure below. The recommended radial clearance to be maintained between the rotor and the top foil surface is between 7.5-12.5 microns.

OAV Foil Journal Air Bearing Design Guide

CW and CWW orientation shown below.

Journal Air Bearing