When a roller chain is used, shaft positions can be arbitrarily established. On the other hand, in principle, observe the illustration shown under. That is certainly, should the chain is tensioned horizontally, keep the top tensioned. Stay clear of vertical transmission every time probable. In an inevitable situation, place the large sprocket with the bottom regardless of the course of rotation.
When the chain layout is undesirable:
?When the top is sagging and the sprocket center distance is quick:
As illustrated beneath, adjust the sprocket center distance shaft to remove the sag.
?Once the top is sagging plus the sprocket center distance is long:
As illustrated under, set up an idler from inside to eliminate the sag.
?When the chain is vertical or inclined:
Reduce the extra sag by a tensioner. In this case, a tensioner that instantly eliminates the sag gives greater effects.
Whenever a pulsating load acts in substantial velocity operation:
The chain’s vibration and also the load effect frequency or chordal action may possibly synchronize to amplify vibration to the chain. Since vibration has an effect on the chain, consider countermeasures to avoid vibration in the following measures:
?Modify the chain velocity.
?Raise chain stress. Nevertheless, note that over-
tensioning can shorten the lifestyle in the chain. ?Use an idler or tensioner to divide the span
?Install a manual stopper to prevent vibration.
Note: Chordal action refers to the vertical motion of chain induced when it is actually engaged with sprockets.