Sprocket Types

 

Sprockets are sturdy wheels with teeth that attach to the chain. As the sprocket rotates, the teeth grab the chain and move other parts that engage the chain. This sequential series of operations allows a simple and controlled rotational movement of larger equipment and machines.

Sprockets are often made of reinforced metal or plastic that can withstand the forces that move the chain. These components are often compared to gears that share a sprocket-like design. Unlike gears that mesh with each other to transmit rotational motion, sprockets only interact directly with different types of chains. Most chain and sprocket systems work similarly to bicycle chain sets, which are lightweight chain and sprocket sets rather than gear systems.

Sprockets are highly specialized pieces built to exactly fit a specific chain and handle specific loads. Sprockets must meet strict specifications regarding the following factors:

·         Size

·         Dimensions

·         Diameter

·         Tooth width and depth

If the sprocket does not fit perfectly into the existing system, the chain cannot be turned correctly and the mechanism will slip or snag. An incorrectly selected sprocket can also break. Wear occurs and teeth break. On the other hand, sprockets that fit the chain can last a long time without failure, even in heavy transport system applications.

Important Specifications for Sprockets :-

The sprocket assembly consists of two main components: sprocket and chain. If the two parts do not complement each other, the system will not work properly. When choosing a replacement sprocket or designing a new chain and sprocket assembly, there are several factors to consider, including:

Type

Different types of sprockets have different cubes. The hub has extra thickness around the center plate of the sprocket that does not contain the teeth. There are four main types of sprockets established by the American National Standards Institute (ANSI).

Type A, a plate without additional thickness or hubs.

Type B pinion with hub on one side.

C-shaped sprockets  with equal thickness bushings on both sides of the plate.

Type C displacement or type D sprockets with two hubs. However, each hub has a different thickness, which makes the sprocket asymmetrical.

Different types allow different applications. For example, type A and B sprockets fit the machine perfectly, while type C sprockets are generally larger and require more thickness to support their weight.

Pitch diameter

For chains: Pitch refers to the chain measurement from the center of the roll pin to the center of the roll pin, which is similar to measuring the distance between the interconnection points on the chain.

For pinions: The diameter of the pinions is measured in three ways.

The diameter at the lowest point between the teeth of a sprocket with an even number of teeth or the bottom diameter

Outside diameter measured at highest point of sprocket teeth

It is the diameter of the pitch between the two teeth bitten by the chain. This measurement indicates whether the sprocket is suitable for a matching piece of chain.

Odd number

The threads are teeth that line the circumference of the sprocket. Many common pinions are single-chain. Other sprockets may have double or triple sprockets that can hold two or three chains at a time. Multi-stranded chains can drive greater torque and forces on a common central shaft.

Gauge diameter

The diameter of the collet is similar to the bottom diameter. Measure the diameter of the sprocket plate not including the teeth. When an operator replaces sprockets with worn or broken teeth, the caliper diameter may be the only way to identify the sprocket dimensions.

Hub diameter

The hub diameter measures the hub diameter (extra thickness across the plate around the center hole) on B-shaped and C-shaped pinions.

Through Hole Length

This is the thickness of the sprocket, it can be measured from the outer edge of the hub through the center hole of the C-shaped sprocket to the outer edge of the opposite hub. In type B sprocket, the length through hole is from the outer edge of the hub to the outer edge opposite the plate.

The LTB of a type A sprocket is simply the thickness of the plate through the hole. This information determines or determines the length of the axis of rotation. Durability tends to increase with higher LTB measurements.

Tooth pitch

Sprockets can have wide or narrow teeth depending on the pitch length of the chain to be combined. Chains with larger pitch diameters generally require sprockets with similar large teeth, while chains with smaller lengths between the roll pin centers require smaller teeth. Tooth pitch refers to the number of teeth per inch.

Hole size

The sprocket hole is a hole through the center of the sprocket through which the driveshaft passes. Knowing the diameter of the shaft will not tilt or slip on the sprocket you choose, and you will not have too small or too large a sprocket hole to fit.

Number of teeth

The total number of teeth on the sprocket is an important measurement. The circumference of the sprocket, the number of teeth and the pitch of the teeth must be carefully selected so that the sprocket fits the pitch of the chain and the equipment itself.

Additional options

Factors beyond tooth size and number can also be important when choosing a new sprocket. Metal sprockets can be heat treated and hardened to withstand extreme operating conditions.

Knowing the exact specifications of the chains and sprockets in your system can help you design and manufacture the proper replacement parts first. With the right parts, components and connected equipment are safer from stalling, overloading and slipping.

Sprocket  types and its applications

There are many types of chain and sprocket assemblies. Each type powers different types of machines that run on the move in different applications and industries. For example, sprocket assemblies can be found in the following applications:

·         Agricultural and agricultural equipment

·         Car equipment

·         Chain-driven machines such as conveyors and other factory systems

·         Pulleys, shafts and other power transmission equipment

·         Vehicles such as bicycles and motorcycles

·         There are many different types of sprockets, including:

 

Roller chain

Roller chain sprockets are the most common type of sprocket. They work along a chain made up of rollers connected by pins. These chains form a space where the teeth of the sprocket fit together to transfer kinetic energy. These are most often used in broadcast equipment.

Single pass and double pass

The single pitch sprocket has separate teeth so that the chain roller pins will fall over all the teeth. The double pitch sprocket has spaced teeth, so the pins fall out of all other gaps. It is used in conveyor systems that require precise product placement.