×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Negative axial force acting in helical bevel gear pair.

## Negative axial force acting in helical bevel gear pair.

(OP)
Hi,
In the calculation of forces (in the MitCalc) in helical bevel gear pair [20/46 teeth pinion/gear, 20° pressure angle, 30° helical angle, Module 2, transferred power 15 kW, pinion speed 6200 RPM] I get a negative axial force for the pinion. This means that the force is pulling the pinion toward the gear. In the solidworks model it seemed that according to the tooth surface angle the pinion should be pushed and not pulled. I asked the support at MitCalc and they tell me that this can happen. I would like to check the force calculation manually. Can somebody explain how it can happen and share the formulas for force calculation in HELICAL bevel gear pair?
Thanks.
http://files.engineering.com/getfile.aspx?folder=df7cc423-712c-4597-81ae-a0e1890ae03b&amp;file=untitled.JPG

### RE: Negative axial force acting in helical bevel gear pair.

Hi DimaC1974

Have a look at this site:-

http://www.roymech.co.uk/Useful_Tables/Drive/Bevel_Gears.html

Scroll down till you come to spirol bevel gears, it shows depending which way the helix angle is the thrust can be positive or negative.

Hope this helps

desertfox

### RE: Negative axial force acting in helical bevel gear pair.

(OP)
Thank you desertfox, this is what I looked for. I just believe that the drawing there is a third angle projection.

### RE: Negative axial force acting in helical bevel gear pair.

desertfox

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!