Flat rubber belts were developed around the turn of the century primarily as replacements for leather belts. With the advent of V-belts, fewer machines were designed to use flat belts, and their production became largely a matter of supplying replacement parts. Recent developments in flat-belt technology have overcome their previous drawbacks of high tension and mistracking. New designs and advances in materials have made both low and high-power transmission practical and cost efficient, and at speeds that usually exceed other belt designs. This type of flat belt is used where minimum vibration is required at the driven pulley. Maximum damping requires tuning the spring rate of these belts. In addition, semielastic belts have many features of unsupported stretch belts while maintaining a fabric substrate for support. Semielastic belts do not require pulley take-up or adjustment, easily work in sets, work well over a wider length tolerance, and are relatively inexpensive in high volume. Because of these features, many OEMs are able to simplify and compact otherwise complicated designs. Over the past few years, a high volume of semielastic belts have gone into machines for the banking industry, copiers, computer disk drives and peripherals, and office equipment. Most of these designs use a wide variety of small multipulley precision drives. Nonstretch endless flat belts also deserve consideration, especially in applications where small pulleys, high speeds (10,000 to 15,000 fpm), or both are involved. Because endless flat belts can be made very thin, 0.015 to 0.062 in., they are not as susceptible to centrifugal loads at higher speeds. Flat belts also are less costly than gears when teamed with small high-speed motors, especially when a compact package is important. Typical applications generally involve motors of 1 hp or less and speeds to 10,000 fpm. Developments here include sticky yet abrasion-resistant rubber compounds that
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Pressure sensors include all sensors, transducers and elements that produce an electrical signal proportional to pressure or changes in pressure.
HVAC Fans and Blowers
HVAC fans and blowers are used to move air through heating, ventilating, and air conditioning (HVAC) systems. They are an integral part of the air handling systems that bring or draw fresh air into buildings.
Air valves allow metered fluid flow in one or both directions. They are used in pneumatic circuits to regulate the rate of activation or exhaust of cylinders and other pneumatic devices.
BTU meters measure the energy content of liquid or gas flows in British thermal units (BTU), a basic measure of thermal or heat energy.
MEMS devices integrate mechanical components, electronics, sensors and actuators on a semiconductor material, chip, or wafer.
Topics of Interest
Sensortechnics' LBA differential pressure sensors measure ultra low air or gas pressures from 25 Pa (0.1 inH2O) full scale. The sensors are based on a new and innovative MEMS technology which...
A document explaining common MEMS sensor terminology,...
There are advantages in using a MEMS (Micro-Electro-Mechanical-System) Mass Flow Sensor to measure flow, rather than the indirect method of using a differential pressure sensor. However, there are...
The application of MEMS to the measurement of pressure is a mature application of micromachined silicon mechanical sensors, and devices have been around for more than 30 years. It...
Built-in flow sensors improve machine efficiency, reduce downtime, and cut costs. New sensors continuously monitor airflow and consumption to help ensure product and process quality and minimize...