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Spline Selection

Spline Selection

Spline Selection

(OP)
How do I size and a select the right spline for a certain application? I know the torque, rpm and a starting shaft size. Any design books you can recommend? Thanks.

RE: Spline Selection

I can't recommend any books, but there are two suggestions.
1. If you need to connect with an off-the-shelf part, like a coupler or yoke, look at whats already available. If this is going to be a production part, find out what profiles your suppllier normally deals with.
2. Generally the spline count goes up with load and/or rpm's. I'm not sure what the exact reason is, but it probably has to do with having a larger rood diameter for strength and more area to transmit torque.

RE: Spline Selection

A fine spline leaves a larger root diameter for the shaft while still retaining bearing area, but is more subject to grit, dirt and damage.

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RE: Spline Selection


Automotive splines are fairly standardized by diameter/tooth count, not fine or course.

If the spline is to be cut, the minor diameter needs to be at least the shaft diameter for 100% strength. If it is rolled it can be formed in the shaft diameter and provide up to about 85%-90% of shaft strength.



RE: Spline Selection

(OP)
We ended up subcontracting the spline design to a designer who provided us with final drawings including dimensions, spline details and heat treatment. Thanks for your replies.

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