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Link motion
(gcide) | Link motion \Link" mo"tion\ (l[i^][ng]k" m[=o]"sh[u^]n) n.
(Steam Engine)
A valve gear, consisting of two eccentrics with their rods,
giving motion to a slide valve by an adjustable connecting
bar, called the link, in such a way that the motion of the
engine can be reversed, or the cut-off varied, at will; --
used very generally in locomotives and marine engines.
[1913 Webster]
Note: The illustration shows a link motion for a vertical
engine, c representing the shaft carrying two
eccentrics, a and b, for making the engine run forward
and backward, respectively, their rods e and d being
jointed to opposite ends of the slotted link f, in the
opening of which is a pin g which is attached to the
valve rod h. The valve will receive the motion of the
forward eccentric when the link is in the position
shown, and the motion of the backward eccentric when
the link is shifted so far to the right as to bring e
in line with h, or a compound motion derived from both
eccentrics when the link is shifted to intermediate
positions, the compound motion causing the valve to cut
off the steam at a point determined by the position to
which the link may have been shifted.
[1913 Webster] |
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