Machine Design Practice Test: Shafts, Keys and Couplings in Machine Design — Flashcards

Shafts, Keys and Couplings in Machine Design topics include: Transmission shafts, shaft design and keys, couplings and pin flexible coupling.

In machine design, shafts, keys, and couplings are mechanical components that connect, transfer power, and absorb misalignments. 

Keys: These pieces of metal are inserted into slots in the shaft and hub of a rotating machine part. Keys prevent relative rotation between the shaft and rotating elements, such as gears, flywheels, sprockets, and pulleys. Keys are made from ductile materials like mild steel and plain carbon steel. In corrosive environments, brass and stainless steel are used. 
Couplings: These devices join two shafts together and allow for some misalignment or flexibility between them. Shaft couplings connect the drive shaft and driven shaft of a motor to transmit power. They introduce mechanical flexibility, providing tolerance for shaft misalignment. 

There are two types of shaft couplings:
Rigid shaft couplings: Designed for shafts with minimal misalignments. They are used when precision alignment is necessary.
Flexible couplings: Have flexible elements that allow for misalignments and axial displacement. They are more advantageous than rigid shaft couplings, which require manual alignment.