This document describes the design of a rigid flange coupling. It consists of two flanges, one keyed to the driver shaft and the other to the driven shaft. Bolts and keys are used to couple the flanges together and maintain alignment between the two shafts. Dimensions and formulas are provided for the key, hub, flange, bolts, and stresses in each component based on the shaft diameter. Rigid flange couplings are used to connect shafts, allow for some misalignment, reduce shock transmission, and introduce overload protection while transferring power from one shaft to another.

1. G.H.PATEL COLLEGE OF
ENGINEERING & TECH.
MACHINE DESIGN & INDUSTRIAL
DRAFTING(2141907)
•ENROLLMENT NO:
140110119115=TRASADIYA UTTAM

2. RIGID FLANGE COUPLING

3. • It consist of two flanges one keyed to the driver
shaft and other to the driven shaft.
• One of the flange has projected portion and
other has a corresponding recess. This help to
bring two shafts in line and maintain the
alignment.
• The two flanges are coupled together by means
of bolts and nuts. The number of bolts used are
generally three, four or six. The two keys are
staggered at right angles along the circumference
of the shafts.
• The flanges made of cast iron ,cast steel or steel.

4. The rigid flange coupling are of three types
1) UNPROTECTED TYPE RIGID FLANGE COUPLING
2) PROTECTED TYPE RIGID FLANGE COUPLING
3) MARINE TYPE RIGID FLANGE COUPLING

5. RIGID UNPROTECTED TYPE FLANGED
COUPLING

6. RIGID PROTECTED TYPE FLANGED
COUPLING

7. DESIGN OF RIGID FLANGE COUPLING
• DIAMETER OF SHAFT-
• KEY DIMENSIONS-
o WIDTH OF KEY- W=d/4
o HEIGHT OF KEY- h=2/3
o LENGTH OF KEY- L=1.5d, ,
d
T
3
16


dwl
T2

dhl
T4


8. • DIMENSIONS OF HUB-
o LENGTH OF HUB=LENGTH OF KEY(l)
o OUTER DIAMETER- D=2d
o STRESS IN HUB-
• DIMENSIONS OF FLANGE-
o THICKNESS OF FLANGE- tf=0.5d
)1(
16
43
KD
T



9. o THICKNESS OF PROTECTIVE FLANGE- tp=0.25d
o DIAMETER OF BOLT CIRCLE- D1=3d
o OUTER DIAMETER OF FLANGE- D2=4d
o DIAMETER OF FLANGE RECESS- D3=1.1d
o STRESS IN FLANGE –
• DIMENSION S OF BOLT-
o NUMBER OF BOLTS- N=3 for d<35mm
=4 for 35<d<55mm
=6 for 55<d<150mm
=8 for 150<d<230mm
tfD
T
2
2



10. • DIAMETER OF BOLT- (d)
dDN
T
2
1
8


dtfDN
T
1
2



11. USES
To provide for misalignment of the shafts or
to introduce mechanical flexibility.
To reduce the transmission of shock loads
from one shaft to another.
To introduce protection against overloads.
To connect driving and the driven par.
To transfer power one end to another
end.(ex: motor transfer power to pump
through coupling.

12. THANK YOU...