英语翻译From Fig.32.1,it can be seen that the propeller shaft ap

英语翻译
From Fig.32.1,it can be seen that the propeller shaft applies to the shaft D a torque which,as it is transmitted through the bevel gearing,is increased in the same ratio as the speed is reduced.This increased torque is then transmitted through the shaft G to the road wheels.From Newton's third law of motion,we know that action and reaction must be equal and opposite,so not only will this torque tend to rotate the wheel,but also the reaction from the wheel will tend to rotate the shaft G in the opposite sense.Therefore,there will be a tendency for the pinion and its shaft D to swing bodily around the crown wheel,and this tendency will be reacted by the axle casing Some means therefore must be introduced to prevent the axle casing from rotating in the opposite direction.This may be simply the leaf springs themselves,or additional links - torque-reaction or radius rods - may be used and will be essential if coil,instead of leaf,springs are employed.