×
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

Pressure build up in gearbox

Pressure build up in gearbox

Pressure build up in gearbox

(OP)
I have a mechanical linear actuator that is a ballscrew mechanism with an oil (Mil-H-5606) filled gearbox.  
Can someone be so kind to explain why there is pressure build up in the gearbox?
 
How can I theoretically determine what the optimum oil fill volume for the gearbox should be? The unit is exposed to temperatures of 70º F, 90º F, and 120º F.

We have been experiencing external leakage with no direct cause found with any of the components. I am wondering if the change in pressure is due to thermal expansion of the air trapped in the unit assembly.

How do I calculate the change in volume of air and the change of volume of oil, unconstrained, over the temperature range referenced above?

I appreciate any input,

Mario
 

RE: Pressure build up in gearbox

It is not uncommon for pressure buildup in a geabox.

It is the temperature of the oil in the gearbox while operating at your stated temperature that be be the root of the problem.

You will need to consult the gearbox manufacturer as the level normally depends on the internal construction.  

There are devices, vents and breathers, to alleviate this problem. These can be used until you can get the correct oil level for your box.

http://www.alemite.com/catalog/details.aspx?identifier=fittings_airventvalves

http://www.alemite.com/catalog/details.aspx?identifier=fittings_breathers

 

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