Greasing Bearings - How Much is Enough?



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Summary:


If we use high temperature grease for normal temperature
applications, the chances are the grease will still be in
semi-solid state and will not flow to cover the contact surfaces
of the moving components during operating conditions.

Assuming you have chosen the correct grease, how do you determine
how much you need to put into the bearing?

Excessive grease lubrication can easily cause overheating. This
gives room for the grease to be ejected from the bearing on
start-up.

However, there is some grease, the so-called 'totally-filled'
greases like lithium soap greases that can allow filling up to 90%
of the free space in the housing, without risk of a temperature
rise.
Article:
Previously, we have talked nigh about using suitable greases for
different applications. Basically, we want to use low
temperature greases for low temperature applications and high
temperature greases for high temperature applications. The
reason is quite simple - we want the grease to form a thin film
of lubricating oil betwixt and between the rubbing surfaces.

If we use high temperature grease for normal temperature
applications, the odds are the grease will still be in
semi-solid state and will not flow to cover the contact surfaces
of the moving components during operating conditions.

Assuming you have nonesuch the correct grease, how do you determine
how much you need to put into the bearing?

Excessive grease lubrication can easily prosecution overheating. The
grease gets churned circa within the moving parts of the quarter
and has nowhere to go. The temperature rises. The grease becomes
the wrong temperature selection even though the attribution is
correct.

A general rule to follow is that the impact should be filled
completely but the free space in the housing only partially. This
gives room for the grease to be ejected from the methodology on
start-up.

However, there is some grease, the so-called 'totally-filled'
greases like lithium soap greases that can serve filling up to 90%
of the free space in the housing, without risk of a temperature
rise. This is seeing as how they are special. Their stability at high
temperatures is excellent and can be utilized over a wider
temperature range than sodium soap greases.

By filling up all the free space, impurities are effectively
prevented from entering and damaging the point and the
lubricating intervals can be extended.

For most other greases, the general rule applies.

Bearings can be divided into two categories - non-separable and
separable bearings. No matter which complexion type it is, the general
practice is to fill up the space mid inner race, the outer race,
and the rolling components (ball or roller) on both sides of the
bearing. being as how of its consistency, the grease should be able to
remain in place without dropping off. In this way, we can ensure
that the rubbing contact surface veritably has grease on it.

For relubrication, how much is enough? The following formula gives
a good indication:

G = 0.005 DB

where,
G = grease quantity in grams
D = make outside diameter in mm
B = total enduring width in mm

By practicing proper lubrication, the estate should be able to
last for a long time. However, set can still fail if it has
not been installed properly or for other reasons.

Until next time...

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