Mechanical Drives and Bearings Flashcards

What is the primary purpose of a keyway in a shaft-to-hub connection?

Answer: To transmit torque between the shaft and the component

A keyway and key create a positive mechanical connection that transmits torque from the shaft to the mounted component such as a gear or pulley.

Which type of bearing is best suited for handling both radial and thrust loads simultaneously?

Answer: Angular contact ball bearing

Angular contact ball bearings are designed with their raceways offset so they can handle combined radial and axial (thrust) loads simultaneously.

What is the correct procedure when installing a tapered roller bearing on a shaft?

Answer: Set the proper endplay or preload using a shim or locknut

Tapered roller bearings require precise endplay or preload adjustment during installation, typically achieved using shims, spacers, or locknuts to ensure proper operation and longevity.

In a V-belt drive system, what does excessive belt deflection indicate?

Answer: The belt tension is too low

Excessive belt deflection beyond manufacturer specifications indicates insufficient belt tension, which leads to slippage, reduced power transmission, and accelerated belt wear.

What is the function of a backstop in a gear reducer?

Answer: To prevent reverse rotation of the driven shaft

A backstop (anti-reverse device) prevents the output shaft of a gear reducer from rotating in the reverse direction, critical in applications like inclined conveyors where reverse rotation could cause material runback.

Which gear tooth profile is most commonly used in industrial power transmission?

Answer: Involute

The involute tooth profile is the industry standard for spur and helical gears because it maintains a constant velocity ratio even with slight variations in center distance between gears.