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%ما هو (من)٪ 1 - تعريف
CYLINDRICAL PROTRUSION USED AS A MOUNTING OR PIVOTING POINT
Trunnions; Trunion
![Early Chinese cannon with trunnions, [[Yuan Dynasty]] (1271–1368). Kept in [[Zhejiang Provincial Museum]].](https://commons.wikimedia.org/wiki/Special:FilePath/Yuan Cannon (16918857248).jpg?width=200 "Early Chinese cannon with trunnions, [[Yuan Dynasty]] (1271–1368). Kept in [[Zhejiang Provincial Museum]].")
Trunnion
·noun A gudgeon on each side of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam.
II. Trunnion ·noun A cylindrical projection on each side of a piece, whether gun, mortar, or howitzer, serving to support it on the cheeks of the carriage. ·see ·Illust. of Cannon.
trunnion
['tr?nj?n]
¦ noun a pin or pivot forming one of a pair on which something is supported.
Origin
C17: from Fr. trognon 'core, tree trunk'.
Trunnion
A trunnion (from Old French "trognon", trunk) is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development.
ويكيبيديا
Trunnion
A trunnion (from Old French "trognon", trunk) is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development.
Alternatively, a trunnion is a shaft that positions and supports a tilting plate. This is a misnomer, as in reality it is a cradle for the true trunnion.
In mechanical engineering (see the trunnion bearing section below), it is one part of a rotating joint where a shaft (the trunnion) is inserted into (and turns inside) a full or partial cylinder.
