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A typical rigid flange coupling is shown in Figure- . If essentially consists of two cast iron flanges which are keyed to the shafts to be joined. The flanges are brought together and are bolted in the annular space between the hub and the protecting flange. The protective flange is provided to guard the projecting bolt heads and nuts. | Module 5 Couplings Version 2 ME IIT Kharagpur Lesson 2 Design procedures for rigid and flexible rubber-bushed couplings Version 2 ME IIT Kharagpur Instructional Objectives At the end of this lesson the students should have the knowledge of Detailed design procedure of a typical rigid flange coupling. Detailed design procedure of a typical flexible rubber-bush coupling. 5.2.1 Rigid Flange Coupling A typical rigid flange coupling is shown in Figure- 5.1.2.1.4.2. If essentially consists of two cast iron flanges which are keyed to the shafts to be joined. The flanges are brought together and are bolted in the annular space between the hub and the protecting flange. The protective flange is provided to guard the projecting bolt heads and nuts. The bolts are placed equi-spaced on a bolt circle diameter and the number of bolt depends on the shaft diameter d. A spigot A on one flange and a recess on the opposing face is provided for ease of assembly. The design procedure is generally based on determining the shaft diameter d for a given torque transmission and then following empirical relations different dimensions of the coupling are obtained. Check for different failure modes can then be carried out. Design procedure is given in the following steps 1 Shaft diameter d based on torque transmission is given by . I 16T d ----I knTs where T is the torque and Ty is the yield stress in shear. 2 Hub diameter d1 1.75d 6.5mm 3 Hub length L 1.5d Version 2 ME IIT .