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Eccentric (mechanism)

From Wikipedia, the free encyclopedia

Eccentric sheave, with strap and eccentric rod fitted

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", out of the center).[1]

It is used most often in steam engines, and used to convert rotary motion into linear reciprocating motion to drive a sliding valve or pump ram. To do so, an eccentric usually has a groove at its circumference closely fitted a circular collar (eccentric strap). An attached 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 an approximation of simple harmonic motion.

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Transcription

On bicycles

Eccentric bottom bracket on a Burley tandem bicycle held in place with two set screws

The term is also used to refer to the device often used on tandem bicycles with timing chains, single-speed bicycles with a rear disc brake or an internal-geared hub, or any bicycle with vertical dropouts and no derailleur, to allow slight repositioning, fore and aft, of a bottom bracket to properly tension the chain.[2]

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.[3] As a standard sized bottom bracket threads into the eccentric, an oversized bottom bracket shell is required to accommodate the eccentric.

Gallery

See also

  • Balance shaft – Weights used to balance otherwise unbalanced engine movement
  • Cam (mechanism) – Rotating or sliding component that transmits variable motion to a follower
  • Crank (mechanism) – Simple machine transferring motion to or from a rotating shaft at a distance from the centreline
  • Concentric objects – Geometric objects with a common centre
  • Crankshaft – Mechanism for converting reciprocating motion to rotation
  • Linkage (mechanical) – Assembly of systems connected to manage forces and movement

References

  1. ^ Norton, Robert L. (2004). Design of machinery (3rd ed.). McGraw-Hill. ISBN 0-07-247046-1.
  2. ^ Brown, Sheldon. "Sheldon Brown's Bicycle Glossary E-F: Eccentric". Sheldon Brown. Retrieved 2007-06-09.
  3. ^ "Cannondale 1FG Easy Chain Tensioning". Archived from the original on 2007-11-23. Retrieved 2007-10-19.
This page was last edited on 9 January 2024, at 22:27
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