about profile of a straight bevel gear

[NickW1]

Hello, I got a simple question about straight bevel gear. Is the profile of a standard straight bevel gear an involute profile, if projected to the plane which is perpendicular to the cone surface? Please help. Thanks a lot.

 

[tbuelna]

NickW1,

Yes, a standard (involute) straight bevel gear tooth profile is essentially a standard spur gear tooth profile, if the section plane is normal to a line along the pitch cone surface.

Regards,
Terry

 

[gearcutter]

Theoretically, bevel gears do not have the same involute profile as spur gears nor are they a spherical involute.
The profile is actually a simpler 'octiod' form.
This is because the line of action on a bevel crown & pinion pair is not the same straight line as a spur pair. The line of action actually resembles a figure 8.
The difference however, between the two profiles is small.


Ron Volmershausen
Brunkerville Engineering
Newcastle Australia

http://www.aussieweb.com.au/email.aspx?id=1194181

 

[NickW1]

Thanks for the kind replies from tbuelna and gearcutter. However, I am still a little confused.

The reason I want to know if it is an involute profile is I will need to do some math calculation on the bevel gear geometry. So if bevel gear is also in involute profile, I can extend the calculation on spur/helical gear to bevel gear.

Or if anybody can kindly recommend a book or reference on calculating the tooth geometry of bevel gear, it would be great.

Again thanks.