controlled manually or automatically. The differentiallock locks one axle shaft to the differential case andbevel drive gear, forming a rigid connection betweenthe two axle shafts that makes both wheels rotate at thesame speed.DRIVING AXLESAxles are classified as either live or dead. The liveaxle is used to transmit power. The dead axle supportspart of the vehicle weight but does not drive the wheels.The wheels rotate on the ends of the dead axle.On rear wheel drive passenger cars, the front axle isa dead axle, and the rear axle is a live axle. In four-wheeldrive vehicles, both front and rear axles are live axles,and in six-wheel drive vehicles, all three axles are live.Thee third axle, part of a bogie drive, is joined to therearmost axle by a trunnion axle, as shown in figure2-17. The trunnion axle is attached rigidly to the frame.Figure 2-17.—Bogie drive.Figure 2-18.—Four-wheel drive transmission.2-12
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