Posted: Mon Apr 17, 2017 3:29 pm Post subject: Automotivedrivingbelt spurred new belt designs V-belts
Have you ever spun an adjustable pulley and increased its diameter to squeeze a little more air out of a belt-driven fan? If so, there have probably been times when you’ve found that the old fan belt no longer fits. The first fix is usually to loosen the bolts on the motor mount and slide the motor as close to the fan as possible to see if the belt will slip over the edge of the pulley. If that doesn’t work, it’s time to surrender muscle to brainpower and calculate the size of a new belt.
While you’re at it, be sure to size and select the right new belt for the job. Your choice will be critical to the long-term performance of the system. Let’s take a look at how to resize a belt, and the steps it takes to be sure the job is done right the first time.
Start by inspecting the existing belt, motor, fan and pulleys. Check to be sure the original belt’s groove size fits the pulleys, and make sure the bearings, shafts and set screws are in good condition and secure.
While you’re at it, inspect the motor mount, the fan and housings to be certain they will remain in good working order after the new airflow is set and that the equipment will be able to operate long term. We’ve all serviced equipment, only to have it die an awful death a short time later. Nobody’s happy when that happens, so look past the new belt.
Record the old belt number written on the exposed surface of the belt. This is your best reference to find the original size, type, and length of the belt. If you don’t have the replacement belt on your truck, these numbers come in handy for the inventory crew to verify your measurements by cross-referencing the belt number with the manufacturer’s catalog. A faded page in a manufacturer’s catalog is more accurate than field belt and pulley measurements any day.
The most common systems for transmitting power from a drive to a driven shaft are belt, gear, and chain drives. But V-belt drive systems, also called friction drives (because power is transmitted as a result of the belt's adherence to the pulley) are an economical option for industrial, automotive, commercial, agricultural, and home appliance applications. V-belt drives are also easy to install, require no lubrication, and dampen shock load.
[Pulleys with more tracks pull more load]
Pulleys with more tracks pull more load
Here's the catch: Standard friction drives can both slip and creep, resulting in inexact velocity ratios or degraded timing precision between input and output shafts. For this reason, it is important to select a belt appropriate for the application at hand.
Belt drives are one of the earliest power transmission systems and were widely used during the Industrial Revolution. Then, flat belts conveyed power over large distances and were made from leather. Later, demands for more powerful machinery, and the growth of large markets such as the automobile industry spurred new belt designs. V-belts, with a trapezoidal or V shape, made of rubber, neoprene, and urethane synthetic materials, replaced flat belts. Now, the increased overall surface material of modern belts adheres to pulley grooves through friction force, to reduce the tension required to transmit torque. The top part of the belt, called the tension or insulation section, contains fiber cords for increased strength as it carries the load of traction force. It helps hold tension members in place and acts as a binder for greater adhesion between cords and other sections. In this manner, heat build-up is reduced, extending belt life. Prestretched tension-member cords (polyester, aramide, steel, fiberglass) also minimize stretch
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