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DIFFERENTIALS and DRIVE AXLES. Chapter 7 Page 137 Classroom Manual Page 247 Lab Manual. OBJECTIVES. Describe the purpose of a differential. Identify the major components of a differential and explain their purpose. Explain the need for drive pinion bearing preload.

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differentials and drive axles
DIFFERENTIALSandDRIVE AXLES
  • Chapter 7
  • Page 137
    • Classroom Manual
  • Page 247
    • Lab Manual
objectives
OBJECTIVES
  • Describe the purpose of a differential.
  • Identify the major components of a differential and explain their purpose.
  • Explain the need for drive pinion bearing preload.
  • Describe the difference between hunting, and nonhunting gear sets.

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objectives1
OBJECTIVES
  • Explain the purpose of the major bearings within a differential assembly.
  • Describe the operation of a limited-slip differential.
  • Describe the construction and operation of a rear axle assembly.
  • Identify the two major designs of rear axle housings.
introduction
INTRODUCTION
  • Solid rear axle (with leaf or coil springs.)
  • IRS (Independent Rear Suspension)
  • Hypoid gear set (pinion below centerline)
  • FWD (helical cut ring and pinion)
  • Differential (allows different wheel speeds)

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solid rear axle
SOLID REAR AXLE
  • Leaf Spring Suspension
  • Coil Spring Suspension
hypoid gear set
HYPOID GEAR SET
  • Pinion centerline is below Ring Gear centerline.

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fwd helical cut ring pinion
FWD HELICAL CUTRING & PINION
  • Pinion can be called the Main shaft, Intermediate shaft, or
  • Transfer shaft.
differential
DIFFERENTIAL
  • Allows each drive wheel to travel at different speeds, and different distances.
function and components
FUNCTION and COMPONENTS
  • Pinion mounted on two tapered bearings.
  • Differential case mounted on two tapered bearings 90 degrees to the pinion.
  • Pinion and differential bearings are PRELOADED no play.
  • Differential assembly is case, side gears, spider gears, and pin.

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Page 139 C

differential operation
DIFFERENTIAL OPERATION
  • Allows drive wheels to operate at different speeds, and travel different distances.
  • When traveling straight ahead both wheels rotate at the same speed and same distance.

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Page 140 C

axle housings
AXLE HOUSINGS
  • Two types of differential carriers:
    • Integral carrier
      • Salisbury or Hotchis
    • Removable carrier
      • Third member

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Page 145 C

differential gears
DIFFERENTIAL GEARS
  • Two types of RWD differential gears:
    • Spiral Bevel
      • Ring & Pinion centerlines intersect
    • Hypoid
      • Pinion centerline is below Ring gear centerline
  • Hypoid lube required!
  • Drive - Coast

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Page 146 C

gear ratio
GEAR RATIO
  • Number of INPUT gear revolutions to equal One OUTPUT revolution.
  • Any # >1:1 = Underdrive
  • 1:1 = Direct drive
  • Any # <1:1 = Overdrive

Driven

Drive

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Page 148 C

determining final drive
DETERMINING FINAL DRIVE
  • Decipher the “code”
    • On the tag under a cover bolt.
    • Differential housing tube.
    • Door post.

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Page 149 C

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