Main Type of Couplings
1. Rigid Coupling
2. Flexible Coupling
1. Types of Rigid Coupling
a. Flange Coupling
b. Collar Coupling
2. Types of Flexible Coupling
a. Chain Coupling
b. Flexible Disk Coupling
c. Oldham Coupling
d. Gear Coupling
e. Hydraulic Coupling
f. Universal Coupling
Tips in Designing Coupling
1. Calculation of coupling design is base on the assumption that shaft are perfectly or accurately aligned so that bending loads are negligible. Therefore, coupling problem are analyzed for torsion only.
2. The safe power which can be transmitted by the flange coupling are computed base on the following:
a. Shearing of the key
b. Compressive of the key
c. Shearing of the bolt between the flange faces
d. Compression between the bolts and the flange
Calculation of the Safe Torque that gives safe Power Transmitted
1. Based on the shearing of the Key
T= SsDWL
2
Where:
Ss = shearing stress, Mpa or psi
D = diameter of the shaft, mm or in
w = length of the key, mm or in
L= length of the key, mm or in
T = torque, N-m or lb-in
2. Base on compression between key and keyways
T = SsDHL
4
Where:
Sc = compressive stress, Mpa or psi
D = diameter of the shaft, mm or in
h = thickness of the key, mm or in
L = length of the key, mm or in
T = torque, N-m or lb-in.
3. Base on shearing of bolts the flange faces
T = FSDbc = SsπDb2DbcNB
2 8
Where:
T = torque, N-m or lb-in.
Dbc= bolt circle diameter, mm or in.
Db = bolt diameter, mm or in.
Nb = total number of bolts
Ss = shearing stress, Mpa or Psi
Fs = shearing force, N or lb.
4. Based on compression between the bolts and the flange
T = FcDbc = ScπDb2DbcNB
2 8
Where:
T = torque, N-m or lb-in.
Dbc= bolt circle diameter, mm or in.
Db = bolt diameter, mm or in.
Nb = total number of bolts
Sc = compression stress, Mpa or Psi
Fc = compression force, N or lb.
Power=2πTN
Where:
Power=2πTN
Where:
P= power, kw or hp
T = torque, N-m or lb-in.
N= revolution per minute, rpm or rps.
Coupling application:
Coupling application:
No comments:
Post a Comment