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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
2.12 The motor shown operates at constant speed and develops a torque of 100 lb-in. dur- ing normal operation. Attached to the motor shaft is a gear reducer of ratio 5 : 1, i.e., the reducer output shaft rotates in the same direction as the motor but at one-fifth motor speed. Rotation of the reducer housing is prevented by the “torque arm,” pin-connect- ed at each end as shown in Figure P2.18. The reducer output shaft drives the load through a flexible coupling. Neglecting gravity and friction, what loads are applied to
(a) the torque arm, (b) the motor output shaft, and (c) the reducer output shaft?

Gear reducer
5" Motor
8"
Motor
Flexible coupling
(To
load)
Torque arm
Reducer
Shaft rotation
FIGURE P2.18
Torque arm
Reducer output shaft
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