Difference between Involute Gear and Involute Spline

[Bambila]

Hi,

Can anyone tell me the difference between Involute Gear and Involute Spline. I searched lot but no result found.
Also any document could be helpfull.

Thanks


Bambila
Mechanical Engineer

 

[IRstuff]

Isn't a spline an extrusion of a gear that's rotated in the axis of rotation?

TTFN
faq731-376

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[fegenbush]

IRstuff, I think that would be a helical gear, but maybe I don't understand what you are saying.

I would put the difference at size and use. If I had to put a hard definition on it, I would say a gear has a face width less than the pitch diameter and is intended to contact a rack or another gear using a portion of the teeth. A spline has a face width greater than or equal to the pitch diameter and is intended to contact another spline of the opposite gender using most, if not all, of the teeth.

 

[TheTick]

Splines are for transferring rotational motion along the same axis.

"Involute" is a curve shape, basically what you get when you unwind a string from a spool and trace the path of the string's end. This shape has useful properties for transferring motion.

 

[dinjin]

The spline involute is the same as a gear. Splines generally are double stubbed as to addendums and dedendums. The addendum of a spline in about .5/DP and the dedendum roughly .625/DP while a gear would have 1.00/DP and 1.25/DP addendum and dedendum.