Hello I'm looking for a parametric model of helical internal gear (and if possible a pinion designed with the same method), in SW 2015 or earlier version. It seems silly, but I find either very well made models, with options to improve the geometry, but they are either spur gears, or models only with external teeth. Or it's paid software. Below is a small summary of what I have listed:
toolbox: internal OR helical teeth, choice of modules and number of teeth from a list, no access to functions to modify adapt, geometry probably approximate: it's not parametric, but it's a library.
Constmeca http://constmeca.free.fr Great job, made available free of charge for educational use. On the other hand, no internal teeth.
GearExpert GearExpert - Gear Design Software Not too expensive (45€) but I'm not sure if it offers the helical internal gears. If qq1 has the answer, maybe I'd invest.
GearTrax Camnetics Software that seems very sharp, but couldn't find any info on the price.
This is not exactly a tutorial, but rather a draft for the automatic generation of a helical inner ring gear and its pinion. All hand-cut in a SW2015 version out of mothballs, as well as its prehistoric PC...
The gear data is provided via the SolidWorks " Equations " module. I tried to automate the generation of the geometry, with 80% success, some sketches having to be taken " by hand " when the master data is modified. The tooth profiles are involutes of circles, and the meshing is visually correct (see video). Weakness of the thing: no correction of the teeth, I lost my copy of the Henriot, Georges by his nickname.
To be exploited without moderation, and without the slightest guarantee from the supplier.
A big thank you to you m.blt! I didn't know about the possibility of saving variables in the equation module. For my part, I took the Constmeca models to make a crown. I'll finish it in the evening if Morpheus leaves me alone. The advantage is that there are the options of tooth correction (offset and feet). Again, no guarantee on the geometry, I am not an expert in the field. I'll post that once done.
This is my model. The settings are managed by the custom properties of the parts. I have the impression that there is slippage at the end of the tooth. If someone can give me their opinion... Also, I didn't test the offset and reduction of teeth. I modified the equations with my common sense, but as said before, I don't have the technical basis to be sure of my shot. Assembly1.SLDASM (626.1 KB) helical crown. SLDPRT (3.8 MB) helical pinion. SLDPRT (582.2 KB)
At first glance at the Constmeca model, it looks well built and the kinematic simulation shows a correct meshing.
The slippage at the contact of the tooth flanks is perfectly normal, it is the primitives that roll without slipping, not the profiles. The slip is maximum when the teeth pick and break the contact, and is cancelled when the point of contact is confused with the tangency point of the primitives.
I'll look at the model more carefully during the day...
