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Question 9.8: Torque Capacity of a Rigid Coupling A flanged keyed coupling......

Torque Capacity of a Rigid Coupling

A flanged keyed coupling is keyed to a shaft (Figure 9.16(a)). Calculate the torque that can be transmitted.

Given: There are 6 bolts of 25 mm diameter. The bolt circle diameter is D_b =150 mm.

Assumptions: The torque capacity is controlled by an allowable shear strength of 210 MPa in the bolts.

F9.16
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Area in shear for one bolt is

A=\left(\frac{1}{4}\right) \pi(25)^2=491  mm ^2

Allowable force for one bolt is

P_{\text {all }}=A S_{y s}=491(210)=103.1  kN

Inasmuch as six bolts are available at a 75 mm distance from the central axis, we have

T_{\text {all }}=103.1 \times 10^3 \times 0.075 \times 6=46.4  kN \cdot m

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