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DIFFERENTIALS and DRIVE AXLES

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

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  1. DIFFERENTIALSandDRIVE AXLES • Chapter 7 • Page 137 • Classroom Manual • Page 247 • Lab Manual

  2. 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. CBC AUTOMOTIVE RK

  3. 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.

  4. 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) CBC AUTOMOTIVE RK

  5. SOLID REAR AXLE • Leaf Spring Suspension • Coil Spring Suspension

  6. HYPOID GEAR SET • Pinion centerline is below Ring Gear centerline. CBC AUTOMOTIVE RK

  7. FWD HELICAL CUTRING & PINION • Pinion can be called the Main shaft, Intermediate shaft, or • Transfer shaft.

  8. DIFFERENTIAL • Allows each drive wheel to travel at different speeds, and different distances.

  9. 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. CBC AUTOMOTIVE RK Page 139 C

  10. 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. CBC AUTOMOTIVE RK Page 140 C

  11. AXLE HOUSINGS • Two types of differential carriers: • Integral carrier • Salisbury or Hotchis • Removable carrier • Third member CBC AUTOMOTIVE RK Page 145 C

  12. 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 CBC AUTOMOTIVE RK Page 146 C

  13. 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 CBC AUTOMOTIVE RK Page 148 C

  14. DETERMINING FINAL DRIVE • Decipher the “code” • On the tag under a cover bolt. • Differential housing tube. • Door post. CBC AUTOMOTIVE RK Page 149 C

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