See also: ( Schaeffer is the parent of INA )

https://www.schaeffler.us/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/tpi/downloads_8/tpi_176_de_en.pdf

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Initial greasing and new greasing

In the greasing of bearings, the following guidelines must be observed:

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Fill the bearings such that all functional surfaces definitely receive grease.

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Fill any housing cavity adjacent to the bearing with grease only to the point where there is still sufficient space for the grease displaced from the bearing. This is intended to avoid co-rotation of the grease. If a large, unfilled housing cavity is adjacent to the bearing, sealing shields or washers as well as baffle plates should be used to ensure that an appropriate grease quantity (similar to the quantity that is selected for the normal degree of filling) remains in the vicinity of the bearing. A grease filling of approx. 90% of the undisturbed free bearing volume is recommended. This is defined as the volume in the interior of the bearing that does not come into contact with rotating parts (rolling elements, cage)


In the case of bearings rotating at very high speeds, such as spindle bearings, a smaller grease quantity is generally selected (approx. 60% of the undisturbed free bearing volume or approx. 30% of the total free bearing volume), in order to aid grease distribution during starting of the bearings.


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If the correct degree of filling is used, favourable friction behaviour and low grease loss will be achieved.


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Bearing rotating at low speeds (n · d M 50 000 min –1 · mm) and their housings must be filled completely with grease. The churning friction occurring in this case is negligible. It is important that the grease introduced is held in the bearing or vicinity of the bearing by the seals and baffle plates. The reservoir effect of grease in the vicinity of the bearing leads to an increase in the lubrication interval. However, this is conditional on direct contact with the grease in the bearing (grease bridge). Occasional shaking will also lead to fresh grease moving into the bearing from its environment (internal relubrication).


Bearings sealed on both sides using sealing washers or sealing shields are supplied with an initial greasing. The grease quantity normally introduced fills approx. 90% of the undisturbed free bearing volume. This filling quantity is retained well in the bearing even in the case of high speed parameters


In the case of higher speed parameters, please consult Schaeffler. A higher degree of filling in sealed bearings will lead to higher friction and continuous grease loss until the normal degree of filling is restored. If the egress of grease is hindered, a considerable increase in torque and temperature must be anticipated. Bearings with a rotating outer ring also receive less grease (50% of the normal filling).