Assembly Drawings 323
dharm
d:\N-Design\Des18-3.pm5
104
30
f^25
R32 f 24
18
28
18
80
12
f 38
f 24
3
10
(^412)
f (^38) f 24
f^55
44
86
f 24
f^25
R24
28
2
1
28
R24
Sl. No. Name Matl. Qty.
1
2
3
4
5
Fork end
Eye end
Pin
Collar
Taper pin
Forged steel
Forged steel
Mild steel
Mild steel
Mild steel
1
1
1
1
1
Parts list
Fig. 18.40 Knuckle joint
18.5.3 Protected Flanged Coupling
Couplings are used to join two shafts so that they act as a single unit during rotation and power
can be transmitted from one shaft to the other. The protected flanged coupling is a rigid shaft
coupling, the axes of the shafts being collinear. Figure 18.41 shows the various parts of a protected
flanged coupling. The flanges 2 and 3 are mounted at the ends of two shafts 1 by means of keys 5.
Later, the two flanges are connected to each other by means of bolts with nuts 4. In this rigid
coupling, the bolt heads and nuts are located in the annular recesses provided on the flanges and
so are not exposed. Hence, the name protected flanged coupling. Figure 7.5 shows the assembly
drawing.
Exercise
Assemble the parts of a protected flanged coupling shown in Fig. 18.41 and draw the following
views:
(i) Half sectional view from the front, with top half in section, and
(ii) View from the right.
18.5.4 Bushed-pin Type Flanged Coupling
This coupling is also used to join two circular shafts. However, this is not a rigid coupling, but a
flexible one. Flexible couplings are preferred to rigid ones, as perfect alignment of two shafts is
difficult to achieve; which is the requisite condition for rigid couplings.
