×
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

Jobs

Needle thrust bearings

Needle thrust bearings

Needle thrust bearings

(OP)
I am looking to use a needle bearing and a needle thrust bearing together.  The needle thrust bearing will use a .032" washer on both sides.  The shaft diameter is .75", the OD of the needle bearing is 1", the OD of the thrust bearing is 1.25".  So good portion of the washer will go unsupported due to the bore of the needle bearing.  My question is, how much of that washer can go unsupported?  This has to be a common setup how do people get around it?




 

RE: Needle thrust bearings

The washer is too thin to go partially supported.
You could:
- Put a bulkhead or a heavy backup washer behind it... and move the radial bearing farther out.. maybe not so good.
- Use a thrust bearing that's a size or two larger, and put a step in the shaft to pilot its i.d... and make the shaft stronger and stiffer between the rotating mass and the radial bearing.
- Put the thrust bearing on the very end of the shaft, bearing on a plate bolted to the end of the shaft, allowing you to put the radial bearing closer to the radial load.
- Use a tapered roller bearing to replace both bearings.


 

Mike Halloran
Pembroke Pines, FL, USA

RE: Needle thrust bearings

(OP)
I was looking at a thicker washer... they come .030, .060, .092, .123, and .154.  To put anything thicker than the .030 will require additional machining, that is the reason I started with .030.

All the other ideas are great if this was a clean sheet design, unfortunately I am stuck with the shaft, housing and radial bearing...just need a method to control the thrust.

I actually like the combination bearings a lot, I was looking at the Timken ones.  But for some reason they only come in metric.  

Thanks for the ideas!

RE: Needle thrust bearings

What's your thrust loading estimate?

RE: Needle thrust bearings

(OP)
Pretty light, it is an idler gear, so there is no real thrust just a moment of ~133 ft lbs...I am thinking most of that will go into the radial needle bearings and very little will actually go into the thrust bearings depending on the clearances...  I have attached my chicken scratch if you can following it....

 

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!


Resources