A trunnion is a cylindrical protrusion used as a
, these are
self-contained concentric bearings that are designed to offer fluid
movement in a critical area of the steering.
The term is also used to describe the wheel that
a rotating cylinder runs on. For example, a lapidiary
(stone-polishing) cylinder runs on a pair of rollers, similar to
trunnions. The sugar industry uses rotating cylinders up to 6.7
metres in diameter and 40 metres long weighing around 1000 tonnes.
These rotate at around 30 revolutions per hour. They are supported
on a pathring which runs on trunnions. Similar devices called
s are used in cement
trunnion in German: