Everything about Eccentric Mechanism totally explained
In
mechanical engineering, an eccentric is a circular disk (
eccentric sheave) solidly fixed to a rotating
axle with its centre offset from that of the axle (hence the word "eccentric"). It is most often employed in
steam engines and used to convert rotary into linear reciprocating motion in order to drive a sliding
valve or a pump ram. In order to do so an eccentric usually has a groove at its circumference around which is closely fitted a circular collar (
eccentric strap) attached to which an
eccentric rod is suspended in such a way that its other end can impart the required reciprocating motion. A
return crank fulfills the same function except that it can only work at the end of an axle or on the outside of a wheel whereas an eccentric can also be fitted to the body of the axle between the wheels. Unlike a
cam, which also converts rotary into linear motion at almost any rate of
acceleration and
deceleration, an eccentric or return crank can only impart
simple harmonic motion.
On bicycles
The term is also used to refer to the device often used on
tandem bicycles with timing chains or
single-speed bicycles with a rear
disc brake or an
internal-geared hub, to allow slight repositioning, fore and aft, of a
bottom bracket in order to properly tension the chain.
They may be held in place by a built-in
wedge,
set screws threaded into the
bottom bracket shell, or pinch bolts that tighten a split bottom bracket shell.
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