02 Nov, 2021

The introduction of a Metric Series of High Torque Drive Belts, featuring a parabolic tooth shape to permit increased tooth contact between the teeth, was prompted by increasing demands for ever-increasing powers and speeds. There’s a belt and a pulley. Shear stress has been reduced because of the revised tooth profile. Resistance, improved power capacity, and lower noise levels are all advantages.

When choosing a form of power transmission for any application, consider the overall system or package size, environmental factors, and application-specific needs such as food-grade or food safety requirements, as well as anti-static or conductive systems for electronic applications.

Environmental temperature (both extremely hot and low temperatures, which can cause difficulties for belts), big dust particles or debris, raising belt tension and adding unnecessary wear to the belt, and depending on the belt type are all important working environment considerations.

Exposure to grease or oil, which might cause the material to degrade more quickly than typical operations (urethane belts are better in these environments).

To select a timing belt pulley, the relevant parameters should be compiled such as:

·         Transmission of power, types of driver, and shaft speed.

·         Shaft speed, drive, and driven machinery ratio.

·         The total number of hours, timing belt pulley would be used with any special operating conditions.

·         Diameters of the shaft and any specific restriction affecting the timing belt pulley diameters and widths.

If you have checked with all this information, you can now read the selection procedure below with some of these simple guidelines:

·         Whatever the driver or driven pulley is, the transmission of power is always related to the smallest pulley in the system.

·         If you have a choice of pulleys, the combinations for the given drive should be considered; a larger timing belt pulley reduces the amount of flexibility in the belt, and belt life is improved. Usually, narrow belts are used in larger pulleys and large pulleys can be expensive.

·         There should be only one flanged pulley in the drive and when the center distance becomes 8 times more than the smaller pulley, both the pulleys should be flanged.

·         A loafer pulley is required when the center adjustment of the shaft is inadequate or correctly tensions the belt.

·         When the speed of the belt exceeds more than 30 meters per second, an iron pulley must not be used.

The Selection of Timing Belt Pulley

While these are some of the more prevalent concerns about operating environments, make sure to check your applications for any others. Before going into belts and pulleys, a typical transmission method is the chain and sprocket, which works well for longer length applications (by adding more links), has a low start-up cost, can be used in conveyance with lugs, and can withstand extreme temperatures.

Metal-on-metal contact (which causes more wear and noise), lubrication, and more regular maintenance periods are all disadvantages. Belt and pulley systems can help to mitigate these concerns because they normally do not require lubrication and have longer maintenance intervals.

Drive Ratio

It can be obtained by dividing the speed of the faster shaft with the slower shaft. If the driven shaft is faster than the speed is increasing, drive.

Selection of Belt Pitch

Using the computer Design Power and the smallest pulley’s speed, choose a belt pitch that is appropriate for the application. This belt pitch should produce a well-proportioned drive, but if the room is limited, another belt pitch may be required.

Distance between the length of belt and centre

Once the belt size (pitch), the number of teeth in pulleys, and approximate shaft centres have been determined, the belt length and actual centre distance can be calculated.

The timing belt is normally a more expensive alternative as a result of these advancements. So, before deciding on a belt kind, consider all of your requirements.

As previously stated, the operating environment may cause some issues with the belt, particularly in temperature extremes, but if you are using it within an approved temperature range, a belt and pulley system may be your best bet, and a timing belt is a way to go for applications that require superior timing and load or power transmission.

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