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DRIVE SHAFTS and UNIVERSAL JOINTS Chapter 6 Page 119 Classroom Manual CBCAUTOMOTIVERKCBCAUTOMOTIVERK.

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Presentation on theme: "DRIVE SHAFTS and UNIVERSAL JOINTS Chapter 6 Page 119 Classroom Manual CBCAUTOMOTIVERKCBCAUTOMOTIVERK."— Presentation transcript:

1 DRIVE SHAFTS and UNIVERSAL JOINTS Chapter 6 Page 119 Classroom Manual CBCAUTOMOTIVERKCBCAUTOMOTIVERK

2 OBJECTIVES u Describe purpose and construction of common RWD drive shafts. u Describe purpose and construction of common universal joint designs. u Importance of driveshaft balance. u Explain natural speed variation. u Describe the canceling universal joint angles. CBCAUTOMOTIVERKCBCAUTOMOTIVERK

3 INTRODUCTION u Drive shaft - transfers power from trans to differential. u Drive shaft is made from seamless steel tubing with yokes at each end. u Some vehicles use two piece drive shafts. u Four-wheel-drive use two drive shafts. u Some axle shafts are made like drive shafts. CBCAUTOMOTIVERKCBCAUTOMOTIVERK

4 DRIVE SHAFT CONSTRUCTION u Typical universal joint and yokes. CBCAUTOMOTIVERKCBCAUTOMOTIVERK

5 DRIVE SHAFT CONSTRUCTION u As the differential travels up and down U-joint angle changes. u The distance between trans and differential also changes. u U-joints permit change in angle. u Slip yoke allows change in length. u Drive shafts have a natural tendency to vibrate. Page 121 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

6 MOVEMENT CBCAUTOMOTIVERKCBCAUTOMOTIVERK

7 Types of Drive Shafts u Hotchkiss - External shaft and U-joints. l Can be either one or two piece. u Torque tube - drive shaft is enclosed. l Ridged shaft. u Torque tube - l Flexible shaft. Page 122 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

8 UNIVERSAL JOINTS u U-joints are crosses between two Y- shaped yokes. u Because U-joints transfer power at an angle they DO NOT rotate at a constant velocity nor are they vibration free. Page 124 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

9 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

10 SPEED VARIATIONS u Input and output speeds are the same. u But the drive shaft itself speeds up and slows down every 90 degrees. Page 125 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

11 PHASING of U - JOINTS u To provide for this canceling effect, drive shafts should have at least two U- joints and their angles must be slight and equal to each other. u Speed fluctuations can be canceled if the driven yoke has the same point of rotation, or same plane, as the driving yoke. Page 127 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

12 CANCELING ANGLES u Vibrations can be reduced by canceling angles. Page 128 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

13 TYPES of U - JOINTS u Single universal joint retained by either an inside or outside snap ring. l Spicer - outside snap ring l Mechanics or Detroit - inside snap ring u Universal joints held in the yoke by U- bolts or lock plates. CBC AUTOMOTIVE RK Page 128 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

14 DOUBLE CARDAN Coupled Universal Joint u Total operating angle is divided equally between the two joints. u Because the two joints operate at the same angle, fluctuations are canceled out. u Double Cardan is classified as a constant velocity joint. Page 130 CBCAUTOMOTIVERKCBCAUTOMOTIVERK

15 MAINTENANCE u Factory joints do not have grease fittings. u Replacement joints need servicing. u Dirt and other buildup on the shaft will affect its balance. Page 132 CBCAUTOMOTIVERKCBCAUTOMOTIVERK


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