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The idea of eccentric movement generally speaks to movement from or off a circular path. Picture a round shaft that rotates. Now picture a circular or disc-shaped piece rigidly attached to the end of the shaft and rotating with it. Now picture the disc rigidly fixed to the end of the rotating shaft, but not directly on center. The circle will continue to move around with the shaft, but when the eccentric disc is looked at from the side, the edge of the disc will vary in its distance from the observer owing to the eccentric mount. A common application of this mechanism might be on the drive wheel of a steam locomotive.
On the drive wheel of a steam locomotive, the large driven wheel, the drive wheel, is built onto the end of an axle, and the two are concentric. But if we can picture a situation where we put something that is an "extension" onto the axle, and that this extension sticks out beyond the wheel, and then shift the extension off the center of the main axle, we'll have our eccentric in that shaft extension. If we turn the wheel, the round "extension" will move in a circle, but that circle will move around the center of the main axle and not rotate in alignment with it. Now put a collar around the eccentric, and then connect a straight operating rod to the collar. As the main wheel turns, the eccentric moves with it, and the operating rod will move back and forth along the direction in which it is pointed. This operating shaft is used in steam locomotives to operate a so-called sliding valve.
Use the link posted below to surf over to the Wikipedia article on the eccentric mechanism. You'll find pictures and additional information there. The pictures alone are a good reason to go. Adam rowley
Wiki User
∙ 12y ago
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