"DIN 20/40-16" spline question

[mrpi]

I was looking over some gear boxes for a design and saw that one of them offered a splined output shaft. I am mounting a spur gear directly to the output shaft of the gearbox and this brought up several questions:

1. The spline looks convenient because it is smaller radially than a shaft and keyway. The spur gear I am mounting would get thin in the area of a keyway broach and the tooth root. Is this an acceptable use of a splined shaft? Will it hold concentricity for the gear?

2. The spline is labeled as DIN 20/40-16. The "16" is obvious as this is the number of teeth, but I haven't been able to find any information about the other numbers. What are they?

3. I am designing the gear that will fit onto the output shaft. If I send the drawing to CGI to have the gear made, will they need some kind of fitment-quality value to dimension the female spline? Or is it built into the DIN standard?

Thanks.

Beat to fit, paint to match.

 

[jbeckhou]

Are you sure about 20/40? Maybe is should be 40/20? I believe it's the OD and ID, 40 OD x 20 ID.

Petrotrim Services

 

[mrpi]

I looked at the drawing again, and it does not specify DIN, sorry about that, it reads:

"20/40 X 16 TOOTH SPLINE"

And it is in reference to the male spline on the output shaft of the gearbox.

I should probably just call up the gearbox mfg and see what's going on.







Beat to fit, paint to match.