Upper Cam Shaft Sprocket & Gear Chain (cont...)

Though the industry has moved toward the use of rubber gear belts, we continue to use gear chain. We certainly recognize the precision and durability that gear belting offers but gear chain better satisfies our requirements. There are two specific reasons why we favor silent gear chain:

One reason is very straightforward. The above picture is one situation where either a gear chain or a gear belt could easily be removed and replaced from the end of a sprocket. But, for sprockets mounted on a shaft between bearings and among cams, a gear chain can be replaced much more easily. (See this for example) With a gear belt, unless a spare was installed during machine manufacture, the only option is to remove the cam shaft - a much larger task.

A gear chain is also more rugged than a rubber gear belt. For example, should a metal guard become loose or damaged and rub against a gear chain, it will make noise and will likely be damaged by the chain. Given a machine running automatically with little or no operator intervention, such a situation would eventually attract attention and cause someone to stop the machine. A gear belt on the other hand will create little or no noise and likely self-destruct before anyone notices the problem. Such a scenario, though remote, can and has happened -- to other machines. A machine that needs a guard replaced is an attractive alternative to one that has crashed in need of thousands of dollars of repair labor and is 'down' for weeks of lost production.

Date last modified January 15, 1997
Go to R. D. Dane Corp. Home Page