Robert Conklin

Involute Helical Gear Generator Feed Back Appreciated

Discussion created by Robert Conklin on Nov 17, 2016
Latest reply on Nov 17, 2016 by Robert Conklin

So I think I have refined a model for an:

“Involute Helical Gear Generator - xxxxxxxxxxx.SLDPRT”

Or, as attached and have set Global Variables for:

CW Rotation, 20 Teeth, 30 Deg Helix Angle, 20 Deg Pressure Angle

“Involute Helical Gear Generator - CW 20T 30 Deg 20 PA.SLDPRT”

.

Involute Helical Gear Generator - CW 20T 30 Deg 20 PA --- Equations

Involute Helical Gear Generator - CW 20T 30 Deg 20 PA --- Equations.jpg

"DiametralPitch"=.87805

"NumTeeth"=20

"PressureAngle"=20

"GearThickness"=10mm

"HelixAngle"=30deg   <- The Desired helix Angle for this helical gear

"ROTATION"="CLOCKWISE"

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After changing the above values to the desired values in the Equations and

Performing at least two Control “Q”s on the model.

The model should rebuild and show the new tooth count etc…

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I have set the path the tooth cut follows as a helical “equation driven curve” set to be
on the pitch diameter and at the helix angle set as a global variable.

.

Involute Helical Gear Generator - CW 20T 30 Deg 20 PA

Involute Helical Gear Generator - CW 20T 30 Deg 20 PA .jpg

While this model will have a good tooth form for an involute curve.

It is not what would truly be THE tooth form for a Helical Gear.
It would be “Good Form” if the helix angle is “ZERO” but the farther one
moves from “ZERO” the more OFF it will be.

I have found that the involute tooth form for a helical gear should be modified

as the helix angle becomes greater.   How to do this in a SW model is beyond me,
at the moment.

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BUT the attached is my attempt at a helical gear generator.

I would appreciate any feed back.

The below showing the mesh of my 20 tooth and 50 tooth Helical gear.

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20T CW to 50T CCW Helical Gear Mesh Assy

20T CW to 50T CCW Helical Gear Mesh Assy.jpg

 

 

 

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