Trochoid generation for Gear root fillet
Trochoid generation for Gear root fillet
(OP)
thread406-61473: trochoid & involute
Hi Can anyone explain me about how to create trochoid for the gear root fillet. I found this thread which was good and informative, but still I couldn't find answer how to construct it. In Dudley's book it says various given parameter (as hobbed) that is not clear to me. Can anyone explain about this.
Regards,
Hi Can anyone explain me about how to create trochoid for the gear root fillet. I found this thread which was good and informative, but still I couldn't find answer how to construct it. In Dudley's book it says various given parameter (as hobbed) that is not clear to me. Can anyone explain about this.
Regards,





RE: Trochoid generation for Gear root fillet
RE: Trochoid generation for Gear root fillet
This looks promising to me, how can I get this program? I am doing analysis on the gear tooth, by modifiying it's profile, So I am expecting to have proper geometry. This is why I need some proper geometry.
thanks for your answer.
RE: Trochoid generation for Gear root fillet
RE: Trochoid generation for Gear root fillet
For gear,
Gear 1 :
No of teeth 26
PCD : 96.84
Face width : 60
Normal Pressure Angle : 22.5
Helix Angle : 20
Normal Module : 3.5
Gear 2
No of Teeth : 27
PCD 100.565
Remaining Data are same
Thanks.
RE: Trochoid generation for Gear root fillet
RE: Trochoid generation for Gear root fillet
Regards,
RE: Trochoid generation for Gear root fillet
RE: Trochoid generation for Gear root fillet
If you still need the trochoid you can use a program such as GearTrax for Solidworks that will create the gears including the trochoid even for profile or rack shifted gears.
RE: Trochoid generation for Gear root fillet
RE: Trochoid generation for Gear root fillet
RE: Trochoid generation for Gear root fillet
The only fault I see is that the tooth form in the center should show the hob radius at the tip which would then not undercut the profile as much. For a 20 degree pressure angle the approximate radius would be 1.5 time the clearance where the clearance is the difference between the addendum and dedendum. Check the Machinery's handbook for examples of rack for stub, full depth and different pressure angle to determine the hob tip radius.
RE: Trochoid generation for Gear root fillet
Gear Geometry & Applied Theory by Faydor L. Litvin
Analytical Mechanics Of Gears by Earl Buckingham
On The Geometry Of External Involute Spur Gears by T. W. Khiralla.
The equations on the images below will help you figure out how to plot the trochoid generated by a rack cutter.
Cheers,
Ron Volmershausen
Brunkerville Engineering
http
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RE: Trochoid generation for Gear root fillet
Thanks for sharing these images, I will surely try to solve these equations and will see what I get. They are really informative. Just wondering though, have you used these equations before for your real case. It looks like that you might have used them before. Yeah I have been using litvin's book as my best reference, but I will try to find another books and see how it helps.
Thanks again.
Regards,
RE: Trochoid generation for Gear root fillet
Oh....and it's free.
Cheers,
Ron Volmershausen
Brunkerville Engineering
Numerical & Experimental Analysis Of Spur Gear In Mesh.
Jiande Wang.
http:
RE: Trochoid generation for Gear root fillet
When the formula gives an (x,y) value, is it just that, or does it get transformed somehow into another coordinate system?
You can see what I generated so far in the image.
Thanks!
RE: Trochoid generation for Gear root fillet
Thanks for all your posting. I still am trying to get it in working condition. But I really appreciate for this help, and will let you know if I get it correct.
Thanks...