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

Spiral bevel gearset - preferred direction of rotation

Spiral bevel gearset - preferred direction of rotation

Spiral bevel gearset - preferred direction of rotation

Looking for someone with Spiral bevel gearset experience.  My question: Would you expect an increase in the torque required to turn a Spiral Bevel gearset in one direction (say Clockwise) vs. the opposite (say CCW).  The formulas that I can find say that the transmitted force (and thus the torque) should be identical in either direction of rotation, but that the Radial and Axial forces will be different.  Shigley (3rd edition 1977 - Mechanical Engineering Design, pg. 491) states "The hand of the spiral should be selected so as to cause the gears to separate from each other and not to force them together, which might cause jamming."  It then gives an example of a pinion being "forced" into the teeth of a gear if rotated backward.

My thinking is that this only affects the radial and axial forces and in turn the supporting bearing forces, but that the transmitted torque to "overcome" this internal gear meshing effect is rather insignificant.


Bob Kerila, PE

RE: Spiral bevel gearset - preferred direction of rotation

I think you offered your own answer.  Shigley
is certainly the expert.  You will be applying
forces to the bearings in a reverse direction if
you reverse the direction of the drive.  Helicals
work the same way.

RE: Spiral bevel gearset - preferred direction of rotation

Shigley is correct. You design your bearings to absorb the loading outward. If the gear are driven in reverse, they will be forced inward and bind. Under low speed, low torque applications, this may not be a prolem, but in high speed, high torque applications, this will overload the gears and most likely strip the teeth on the pinion.

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


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