A shaft coupling is used for what?
To connect two shafts and turn in the same direction on the same centerline
What are the 3 categories of couplings we discussed?
- Rigid
- Flexible
- Universal joint
What are the 3 types of rigid couplings?
- Flange
- Sleeve
- Ribbed
Pros of rigid couplings?
No lubrication, low maintenance and highest power transmission
Cons of rigid couplings?
No machine protection, perfect shaft alignment and they require the bearing to be very close to the coupling
What is the biggest advantage a flexible coupling has over a rigid coupling?
Allows for some misalignment
Most common types of universal joint couplings?
Block and pin
Cross and bearing
How do Universal joint couplings accommodate for misalignment?
By using a telescoping shaft that is square or splined
What is the heaviest duty rigid coupling?
Ribbed coupling
What is the lightest duty rigid coupling?
Sleeve coupling
Biggest advantage of ribbed coupling?
Maintenance free
Axial movement is also referred to as what?
In play or in float
List 3 functions of flexible couplings?
- Insulate the driver from the driven equipment
- Instrumentation
- Dampen vibration
What are the 2 things backlash provides?
- Clearance for misalignment
- A place for lubrication
Which flexible coupling is only used for instrumentation?
The miniature coupling
What are the 3 disciplines for the application of flexible couplings?
- Miniature discipline (instrumentation)
- The general purpose industrial discipline (store stocked)
- Special purpose industrial discipline (special order)
Which coupling accommodates misalignment with axial clearance between gear teeth called backlash?
Gear coupling
What are the 3 types of chain couplings?
- Double roller
- Silent chain
- Plastic chain
What are some couplings that would require lubrication?
Double roller, grid couplings, silent chain
