What are the arrangement, tensioning and lubrication of chain drives?

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1. Chain drive layout

The chain drive should generally be arranged in the vertical plane, and should be avoided as far as possible in the horizontal or inclined plane. If it is really necessary, devices such as a pallet or a tensioner should be considered, and a more compact center distance should be designed.

2. Tension of chain drive

Purpose: to avoid poor meshing and chain vibration when the chain sag is too large; at the same time increase the wrap angle of the chain and sprocket. When the inclination angle of the center line of the two wheels is greater than 600, a tensioning device is usually provided.

Tensioning method: when the center distance of the chain drive is adjustable, adjust the center distance to control the degree of tension; when the center distance is not adjustable, a tensioner can be set or 1~2 chain links can be removed after the chain wears and becomes longer. restore the original length. The tensioner is generally pressed against the loose edge near the small sprocket. The tensioner can be a sprocket or a toothless roller. The diameter of the tensioner is close to that of the small sprocket. The tensioning wheel has automatic tensioning (using automatic tensioning devices such as springs and hoisting weights) and regular adjustment (using adjustment devices such as screw and eccentric). In addition, it can also be tensioned by pressing plates and pallets.

3. Lubrication of chain drive

The lubrication of chain drives is very important, especially for high-speed, heavy-duty chain drives. Good lubrication softens shocks, reduces wear and extends chain life.

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