md2 midterms elements

machine elements used when the distance between the driving shaft and driven shaft is too great to be connected by gears

• Belts

• Ropes

• Flexible connectors

• Chains

rotating member that acts as storage reservoir for energy when work is not consumed at as fast a rate as the power is supplied.

• Belts

• Ropes

• Flexible connectors

• flywheel

usually made of leather, rubber, or woven fabrics; flat and thin; pulleys nearly cylindrical with smooth surfaces.

• Belts

• V-belt

• Flat belt

• Timing belt

Used to connect shafts as much as 9 m (30 ft) apart; Run economically at speeds as high as 23 m/s (4500 fpm);

• Belts

• Flat belts

• V-belts

• Timing belts

made with V-shaped cross section to be used on grooved pulleys

Used for connecting shafts which are less than 5 m (15 ft) apart; Speed ratios up to 7 to 1; Speed is up to 25.5 m/s (5000 fpm);

• belts

• flat belts

• v-belts

• timing belts

basically flat belts with series of evenly spaced teeth on the inside circumference, thereby combining the advantages of flat belts with excellent traction of gears and chains.

• belts

• flat belts

• v-belts

• timing belts

flexible connectors that are nearly circular in cross section and made up of manila, hemp, cotton, or wire.

• flexible connectors

• belts

• chain

• ropes

Run on either grooved pulleys or drums with flanges; Used for connecting shafts up 30.5 m (100 ft) apart; and Operate at a speed of less than 3 m/s (600 fpm)

• flexible connectors

• belts

• chain

• ropes

composed of metallic links jointed together, and run on either sprockets or drums either grooved, notched, or toothed, to fit the links of the chain.

• flexible connectors

• belts

• chain

• ropes

Used for connecting shafts less than 5 m (15 ft) apart; Speed depends on the type of chain; and Roller and silent chains may operate at speeds up to 13 m/s (2500 fpm).

• flexible connectors

• belts

• chain

• ropes