Couplings 1 Flashcards
A shaft coupling is used for…
Connecting 2 shafts that turn in the same direction on the same center line.
What are the three major types of shaft couplings?
Rigid, flexible and universal joint
What are Rigid couplings used for?
To connect shafts that are perfectly aligned.
What are the 3 types of rigid couplings?
Flange (most common)
Sleeve (least amount of power transfer)
Ribbed (most power transfer)
What is the simplest type of coupling?
Rigid
Where do support bearings go?
As close to the coupling as possible.
Flange couplings are used to,
Connect shafts of the same or different diameter.
Advantages of flange couplings
1) joins shafts of same or different diameter.
2) easy to install
3) minimum mtc and wear
4) heavy duty applications
Ribbed coupling advantages
Heavy duty use
Mtc free
Easy to install or remove
Connects shafts of same diameter
Offers the most power transfer
Which type of rigid couplings can couple shafts of different diameters?
Flange and sleeve
Which couplings offer the least amount of power transfer?
Sleeve
Disadvantages of ribbed couplings
1) Must have perfectly aligned shafts to work properly.
2) No machine protection
3) Bearings must be as close to the coupling as possible.
What are the two types of misalignment?
Angular and parallel
What does angular misalignment mean?
The shafts don’t meet in the middle correctly
What does parallel misalignment mean?
They are on a different plane field vertically.
Axial movement is also known as
End play and in float
Axial movement
(Also known as end play and in float)
Means what?
Shaft will be moving constantly.
In play and inflow for room for the flexible coupling to flex and move a bit.
3 functions of flexible couplings
Protect equipment
Dampen (vibration and shock)
Insulate (from heat and electricity)
Measure (output speeds)
What is miniature variety?
Used on Light machinery
And instrumentation
General purpose means what?
Common couplings
Special purpose means?
Very specific to the application
Gear couplings of the flexible couplings transmit?
The most torque
Gear couplings
Backlash is engendered clearance for what?
Misalignment
A place for lubrication
An allowable space for thermal expansion to happen
What is the most common style chain coupling?
Double roller chain
