LESSON 3 Flashcards
The most important objectives
of bearing design are to
extend bearing life in machines, reduce friction
energy losses and wear, and minimize maintenance expenses and downtime
of machinery due to frequent bearing failure.
depending on whether the bearing load is in the radial or axial direction,
respectively, of the shaft.
A bearing can also be classified as a radial bearing or a thrust bearing,
the force
on the bearing is referred to as
bearing load.
is in the direction of the shaft axis
The axial component (also referred
to as thrust load)
is in the direction normal to the shaft axis.
radial load component
Bearings can also be classified according to their geometry related to the
relative motion of elements in machinery.
Examples are
1. journal,
2. plane-slider,
3. and spherical bearings.
is widely used in machinery for rotating shafts.
A journal bearing, also referred to as a sleeve bearing,
is used mostly for linear motion,
such as the slides in machine tools.
plane-slider bearing
are characterized by rolling motion, such as in
ball bearings or cylindrical rolling-element bearings.
Rolling-element bearings
bearings. The advantage of rolling
motion
it involves much less friction and wear,
refers to a sleeve bearing or an inclined
plane-slider where the sliding plane floats on a thin film of lubrication.
hydrodynamic bearing
The concept of operation is that a
magnetic force is used to support the bearing load.
electromagnetic bearing. It
The advantage is that there is no contact
between the sliding surfaces, so wear is completely prevented as long as there is
magnetic levitation.
ELECTROMAGNETIC BEARINGS
is the load placed on a bearing assembly
Pressure
is the surface speed at which an object, such as a shaft, moves.
Velocity
