×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

U-joint question
2

U-joint question

U-joint question

(OP)
With a larger U-joint will I be able to run it at a higher angle? Or with the larger joint comes a larger yoke and these cancel out any angle gains? This vehicle will not be run on the road so speed and vibration are not of great concern. I know the higher the angle the shorter the life, I have no problem doing the maintenance or buying a new joint once in a while. As long as the shaft doesn't bind, I'll be happy.

RE: U-joint question

A larger U-joint is stronger, so you may be able to run it at a higher angle, but I don't think so.  It's still spinning pretty fast.  When a driveshaft is straight, there is no rotation of the U-joints.  You may want to consider using a CV joint as they can tolerate higher angles.

RE: U-joint question

travismac-

Hope this helps:
from a spicer chart

series  width  cap       max angle continous Short duration
                   Dia                             lb-ft         lb-ft
1310    3-7/32  1-1/16    30           130          800
1330    3-5/8   1-1/16    20            150          890
1350    3-5/8   1-3/16    20            210          1240
1410    4-3/16  1-3/16    37           250          1500

Jburgess

RE: U-joint question

(OP)
"You may want to consider using a CV joint as they can tolerate higher angles."

The truck originally had a double cardigan joint, what you are calling a "CV" I had to take it out after the lift was installed. I got better results with a single u-joint at each end of the drive shaft.  The "CV" joint sticks out from the transfer case roughly 6" and the total length of the shaft is maybe 20". If I was going to use the "CV" I would have to cut and turn the knuckles on the axle, and thats not something I feel like tackling right now.

I'm not sure why, but the GM 1ton that I got the axle out of was not lifted and didn't use a "CV" joint either. Why was it used on 1/2tons??

RE: U-joint question

The reason for CV joints is to reduce the driveshaft acceleration and deceleration ramps.  During one complete rotation, assuming a less than perfectly straight in-line U-joint angularity, the driveshaft will encounter two distinct speed-up and slow down periods.  This rate of speed cycles increases with the square of the angularity.  CV joints maintain a somewhat stable driveshaft cyclic variation whereas a common U-joint does not.  The heavier the driveshaft, the more noticeable the forces.  This is what causes driveshaft sling at high speeds and torque loads.  Its not the size of the joint that allows for increased angles, but the clearances between the yoke surfaces in the driveshaft and input and output flanges.  The larger joints will allow more power throughput.
Franz

RE: U-joint question

I suspect the "CV" joint suggested above is the type used in front-wheel-drive vehicles.
It may not be easy to find in the sizes you would need, and replacing the stock cardan joints with the ball-knuckle fwd style joints could be a lot of work.
I suppose the type of u-joint selected would have a lot to do with the vehicle's sensitivity to any driveline torsional exitation, and how likely the occupants are to notice the results of it.
cheers
jay

Jay Maechtlen

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

eBook - Integrating the Engineering Ecosystem
Aras Innovator provides multiple options for integrating data between systems, depending on the scenario. Utilizing the right approach to meet specific business requirements is vital. These needs range from authoring tools, federating data from various and dissimilar databases, and triggering processes and workflows. Download Now
Research Report - Simulation-Driven Design for SOLIDWORKS Users
In this engineering.com research report, we discuss the rising role of simulation and the paradigm shift commonly called the democratization of simulation. In particular, we focus on how SOLIDWORKS users can take advantage of simulation-driven design through two analysis tools: SOLIDWORKS Simulation and 3DEXPERIENCE WORKS. Download Now
White Paper - Industry 4.0 and the Future of Engineering Education
With industries becoming more automated, more tech-driven and more complex, engineers need to keep their skills and knowledge up to date in order to stay on top of this wave—and to be prepared for the Industry 4.0 future. The University of Cincinnati offers two online Master of Engineering degree programs designed specifically for practicing engineers. Download Now
eBook - The Design Gridlock Manifesto
In this eBook, you’ll learn 6 ways old CAD technology slows your company down and hear how design teams have put those problems to rest. “The Design Gridlock Manifesto” shares first-hand modern CAD experiences from 15 companies around the world. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close