1 / 20

Chapter 20

Chapter 20. Front-Wheel Drive CV Joint Fundamentals and Service. Introduction. Front-wheel drive vehicles have a transaxle that combines both transmission and differential in one unit. Drive axles with constant velocity (CV) joints extend from the ends of the transaxle.

kynan
Download Presentation

Chapter 20

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 20 Front-Wheel Drive CV Joint Fundamentals and Service

  2. Introduction • Front-wheel drive vehicles have a transaxle that combines both transmission and differential in one unit. • Drive axles with constant velocity (CV) joints extend from the ends of the transaxle.

  3. Front-Wheel Drive Axles • Front-wheel drive axles are equipped with CV joints. • CV joints are necessary because universal joints cannot operate at the angles needed. • CV joints allow the drive axle to change length and turn.

  4. Front-Wheel Drive Axles(continued) • Front-wheel drive axles operate more slowly than a rear-wheel drive shaft because the front wheel axles have already been through the gear reduction of the differential.

  5. Axle Shaft Parts • Drive axles are also called half shafts, or axle shafts. • There is a short shaft splined into the front wheel bearing called a stub shaft.

  6. Axle Shaft Parts(continued) • The transmission end of the shaft may have another stub shaft, or a female end that fits over a male transmission output shaft.

  7. CV Joints • There are three ways to classify a CV joint: • Inboard and outboard. • Fixed and plunge. • Ball and tripod.

  8. CV Joints(continued) • The inside end of the drive axle is called the inboard joint. • The outside end of the drive axle is called the outboard joint.

  9. Plunge CV Joints • The inboard joint is the plunge joint. • The plunge joint has the capability to change its length with the movement of the suspension. • The plunge joint also transmits movement.

  10. Fixed Joints • The outboard joint is also called the fixed joint. • The fixed joint is responsible for pivoting as the steering is turned.

  11. CV Joint Construction The most common types of CV joints: • The Rzeppa joint for the outer or fixed joint. • The tripod joint for the plunging, or inboard joint.

  12. Axle Shaft Design • Early designs used two unequal-length drive shafts. • This caused torque steer in some higher-performance models. • The longer shaft tended to twist more than the short shaft, and torque delivery was unequal.

  13. Axle Shaft Design(continued) • One way to prevent torque steer was to make the longer shaft out of larger diameter tubing, or use an extension (intermediate) shaft on the transmission. • Currently, manufacturers try to keep axle lengths as close to equal as possible.

  14. CV Boot Service • Most CV joint boots are designed to last about 75,000 miles. • If the boot is leaking, the CV joint will fail from lack of grease in a short amount of time.

  15. Axle Inspection and Diagnosis • Check for obvious looseness. • Check for leaking boots. • Clicking sounds that change with speed during turns could be caused by a bad outboard joint.

  16. Axle Inspection and Diagnosis(continued) • A bad plunge or inboard joint can cause a clunking sound when starting from a stop, or during deceleration and/or braking. • The axle may have to be disassembled to find the cause of a problem.

  17. Axle Shaft Repair • If the axle joint is damaged, the technician will have to decide whether to repair or replace the axle. • Be sure to follow manufacturer’s guidelines for removing, replacing, and rebuilding axles.

  18. Axle Shaft Repair (continued) • Often, the most economical repair is replacement of the entire axle with a rebuilt axle. • The rebuilt axle can cost less than a single joint.

More Related