×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

worm gear analysis

worm gear analysis

worm gear analysis

(OP)
I have set up a model to analyse the stresses in a worm and wheel used in a new acuator that we are developing.  The worm is constrained radially at both ends by bearings.  The worm meshes with the coresponding wheel.  There are contacts placed between the two parts.  A torque is applied to one end of the worm.

The problem I have encountered is that when I review the results I have found that the worm gear is growing in diameter, i.e. in the direction that it has been radially constrained.  It also begins to overlap the mating wheel gear.

Does anyone have any suggestions as to why this is happening?

RE: worm gear analysis

Contact analysis results in ProM are often the victim of a bad post processor. Often the results are right, but the graphical representation will show overlapping. However, to make sure, refine the mesh at the contact surfaces and run a Multi-Pass Adaptive (MPA) analysis. Then check the results for the worm component only and look at each displacement component separately.

Also check the validity of the constraints.

RE: worm gear analysis

Make sure your model is not underconstrained.  If you only have a constraint in the radial direction, you would also have to constrain rotations (theta) as well as z.  

I had a contact problem where the model was underconstrained but still solved.  The results showed one of the parts "growing" radially as you described. Adding a rotational constraint fixed the problem.

- dave

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

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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