×
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

plain bearing problem

plain bearing problem

plain bearing problem

(OP)
I have a difficulties to solve problem in our machine. The problem came up when the plain bearing was replaced. The lubricant became black, viscosities drop and temperature rise. I suspect that the oil film not generated properly because of the clearance of the shaft and bearing. What is the right clearence for this kind of bearing? What is the recommended material instead of babbite? I would be appreciate for your explanation. Thanks

RE: plain bearing problem

The right clearance (D-d) acc. Huette 27 auflage (1951)  is app. (D-d)/D = 0.001;
more precise see in Mashinery's handbook 25 ed. pp.2118-2130.

RE: plain bearing problem

Choosing the correct clearance for a sleeve bearing involves consideration of the speed and load, as well as the geometry and lubricant.  You mention blackened oil, but you do not mention whether the babbitt was damaged.  Using 0.001 in/in works very well for some applications.  Other designs use larger clearances, some smaller.

You also mention replacing the babbitt with some other material.  This would normally be done due to a load or temperature requirement which exceeds that of babbitt.  Your note implies that the bearing had been repaired, implying that it had worked successfully for some time.  If so then some detail of the bearing bore, including the clearance, could be responsible for the apparent burning of the lubricant.  There may also have been coincident changes to the machine, lubricant, or bearing design which are significant.

Can you provide more information on the bearing application and any damage to the bearing?
-- Lyle

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