Figure 11-4.-The seven basic types of antifrictional hearings.
movement. They are used chiefly on heavy machinery,
your roller skates or bicycle wheels spin freely. If any
such as Kingsbury thrust bearings used in heavy
marine-propelling machinery (figs. 11-2 and 11-3). The
base of the housing holds an oil bath, and the rotation of
the shaft continually distributes the oil. The bearing
consists of a thrust collar on the propeller shaft and two
or more stationary thrust shoes on either side of the
collar. Thrust is transmitted from the collar through the
shoes to the gear housing and the ship’s structure to
which the gear housing is bolted.
ANTIFRICTIONAL OR ROLLER
AND BALL BEARINGS
You have had
bearings since you
first-hand acquaintance with ball
were a child. They are what made
of the little steel balls came out and were lost, your roller
skates screeched and groaned.
Antifrictional balls or rollers are made of hard,
highly polished steel. Typical bearings consist of two
hardened steel rings (called races), the hardened steel
balls or rollers, and a separator. The motion occurs
between the race surfaces and the rolling elements.
There are seven basic types of antifrictional bearings
(fig. 11-4):
1.
2.
3.
Radial ball bearings
Cylindrical roller bearings
Tapered roller bearings
11-3
