Page 52 - Mechanical Engineer's Data Handbook

STRENGTHS OP MATERIALS 41

Torque capacity A large variety of flexible couplings are used to
accommodate angular, parallel or axial misalignment.
d-depth of spline or half depth of key Several types arc shown.
r = mean radius of spline or shaft radius for key
n=number of splines
L=length of spline or key
b = breadth of key
T= limiting torque
0, =allowable crushing stress
t = allowable shear stress
Keys : E
T=tbLr (based on shear)
T=a,dLr (based on crushing)
Splines :
T=a,ndLr (based on crushing)
(a, =about 7 MPa for steel)

I .6.4 Shaft couplings

Shaft couplings may be ‘solid’ or ‘flexible’. Solid
couplings may consist simply of a sleeve joining the
shafts, the drive being taken by pins or keys. For large
powers, bolted flanges are used to give either a solid or
flexible coupling.