Download - Drivelines and axles
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Drivelines and axles
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FWD axles
Drive axles for FWD commonly called half shafts
Half shafts allow wheels to turn and have suspension movements– Half shafts consist of inner CV joint, axle shaft
and outer CV joint– Most half shafts are unequal length causing
torque steer Most use a sealed front wheel bearing
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Constant velocity joints
CV joints deliver uniform torque through wide range of angles
Inner joints must be plunge type Outer joints usually have wide range of
angles and do not plunge (Rzeppa) Joints must operate in a sealed and
clean environment
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CV boots
Boots must seal joint and grease Common failure point on outer joint Axle and joints must be removed to
replace boot and grease Only solid boots should be used May need special tools for clamps
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CV service
Normally a failed joint will cause noise– Clicking joint on turns is usually outer CV– Vibration during accel/decel and /or clunk
usually inner CV Running wheels off of ground can
damage joints Moisture / dirt in joint from ruptured boot
is death to the joint
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RWD drive shafts
Drive shaft connects transmission to rear axle
May be called propeller shaft May be one piece or two piece if
needed due to angles Will have at least two u-joints Will have critical balance weights
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U-joints
Similar to CV joints in purpose but not as flexible
U-joint angles must be similar to cancel each other
U-joints must be phased to eliminate vibration
Front yoke of driveline must be able to plunge in and out on transmission output shaft
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U-joint service
Can be retained in yoke by outside or inside snap rings
Can be retained by injected plastic Defective u-joints will normally cause
vibrations Worn joint may cause clunk on accel Most joints are permanently lubed
– Some replacement joints have lube fitting
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