Self-Lubricating Bearings

Sintered bearing absorbs the oil in its porous structure (Figure-A). Once the shaft starts turning, due to the vacuum effect; the oil in the bearing structure fills the clearance between the shaft and the bearing (Figure-B).

When the shaft stops, the oil returns to the bearing body by the capillary effect (Figure-C).

Since the oil is not consumed the self-lubricating property of the bearing is saved.

For a long life self-lubrication, it is recommended to use an oiled wick or a sealing put in the housing made at outer surface of the bearing.

Sinter Bearing Dimensions

If the number of renditions of the shaft and the load on the bearing are known, the formula giving the width of the bearing according to the inside diameter is;

L = F / Pxd

L: width of the bearing (cm)
F: Total load (kg)
d: inside diameter of the bearing
* P: specific load (kg/cm2)

Example: If the bearing inside diameter is 20 mm and the shaft turns with 1000 rpm; using the vertical axis, P is found to be 18 kg/cm2.

*(found using the graphic on right)

How To Assemble Sintered Bearings

To assemble the sintered bearings it is recommended to use a hardend and ground chuck as described on right.

During installation this chuck both prevents the deformation of the bearing and also helps to have good tolerances by calibrating.

Machining of The Sintered Parts

Sintered parts can be turned, milled, tapped, and reamed where necessary. But it is not recommended to machine the inside diameter of the self-lubrication bearings since the oil cells will be closed by this operation. Where necessary for the machining please use a cutter with the geometry given on right.