Roller chain sprockets come in a variety of different sizes, types, weights and shapes. In general, sprockets are a wheel that has cogs — or teeth — that are designed to catch and move a chain along a specific path. While they look physically similar, gears differ from sprockets because gears mesh directly with each other. Sprockets never mesh directly with another sprocket; instead, they are designed to interact with roller chains. It is critical to your project success that you select the correct type of sprocket to match the chain that you’ve selected.
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Types of Sprockets
There are essentially four different types of sprockets for sale, each of which are indicated by the type of hub that the sprockets have. The four options include:
- Type A: These hub-free sprockets are often mounted via a series of tapered or plain holes, matched to hubs of the devices on which they are mounted.
- Type B: Simple sprockets with a hub on only one side of the device. This allows one side of the sprocket to be closely mounted to the machinery that it is driving, reducing the overall pressure on the bearings.
- Type C: A good rule of thumb for sprockets is the larger the hub — the greater the pressure that the sprocket can support. Type C sprockets include a hub on each side of the sprocket, and are made for a heavy-duty application that will support a great deal of weight through the shaft.
- Type D: The versatile Type D sprockets provide an easy way to change the speed ratio of a chain without removing other equipment or bearings. These sprockets can be either mounted on a split hub or a solid hub, but they are often tightly bolted for easy removal from the hub.
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The number of sprocket teeth allows you to calculate the total gear drive ratio. To determine this ratio, divide the total number of rear sprocket teeth by the quantity found on the counter-shaft sprocket. In general, fewer teeth in a counter-sprocket or larger teeth in the rear sprocket equals faster acceleration of the machine, but a lower top speed.
Sprocket diameter is the second major dependency of the strength and power available for the sprocket. The number of teeth and the sprocket diameter together determine the total gear ratio of a chain drive system. You will need to know both the pitch diameter of the sprocket as well as the outside diameter before you’re able to accurately order the particular type of sprocket for sale for your project.
Want to learn more about sprockets for sale and how they support the overall operation of your machine? Contact our knowledgeable team at PEER Chain at 800-523-4567 or via email to info@PEERchain.com.