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Help! New Engineer Need help identifying CV shaft spline standard

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Help! New Engineer Need help identifying CV shaft spline standard

Speedracerfast

(Automotive)

(OP)

31 Dec 19 03:00

My first post here. I am a young engineer and just got my first job out of college as a design/reverse engineer for an aerospace company. Currently, I am doing my own automotive projects on the side and having trouble identifying this spline. Long story short, I am retrofitting tapered roller bearings into a hub and spindle for an old Isuzu. I have virtually everything complete besides matching this spline standard. I've been beating my head on this part for a bit now, and would appreciate any insight. Also, I can't find a copy of any JIS spline standards that don't cost upwards of +$350!

Pics attached too.

I am pretty sure it is JIS-D- or JIS B. Although it is probably a JIS-D- because it's a CV shaft, meaning major diameter fit. I could be wrong about it being a JIS standard because my research points out that GM had a lot to do with building this car.

Spec/Dimensions I've found below via optical comparator:

Internal Spline
24 Teeth
Small ID (tip to tip): 0.975"
Big ID (root to root): 1.06"
Tip width: 0.027"
Root Width: 0.017"
Angle of tooth (paint drawing attached for clarification): 40-50 degrees

• https://files.engineering.com/getfile.aspx?folder=b99d5aca-da44-44ce--2

Hi everyone, I am working on getting the mating CV/axle shaft which should be in my hands soon (a nearly brand new one.. super lucky!).

I have attached more pics of the spline too for reference.

RE: Help! New Engineer Need help identifying CV shaft spline standard

lfw618

(Mechanical)

I think you may need to take some measurements between pins. Using several size pins could also help determine if it is an involute or not. Although if it's GM there's a decent chance it's not a standard spline. I would recommend reading up on involute splines so you know what you're looking for with major/minor diameters, circular space width, and pressure angle etc.

RE: Help! New Engineer Need help identifying CV shaft spline standard

Speedracerfast

(Automotive)

(OP)

3 Jan 20 16:16

Thanks lfw618. I am familiar with the 3 gauge pin method, but only for something external, I only have the internal spline here. I could track down the CV shaft and do it on that.

Why since GM it won't match a standard spline? Do they have their own spline standards or something?

RE: Help! New Engineer Need help identifying CV shaft spline standard

lfw618

(Mechanical)

Measurement between or over pins is just two pins. Again I think you would benefit from reading up more on involute spline terminology. There is a lot of information readily available on the internet without needing to buy a standard.

Automotive is one of those industries where non-standard splines are often justified. GM often uses non-standard splines in their drivetrain parts in my experience.

RE: Help! New Engineer Need help identifying CV shaft spline standard

mfgenggear

(Aerospace)

Yeppers that's a spline all right ,
3 wire check wont work, only two wires since truncated
obtain dentist two part mold, and cast a mold or if you can
measure circular pitch, and with the mold measure the base pitch.
look at charts for combination to get a Module or DP that has the same CP & Base Pitch..
it looks like a 45 deg spline.

do you have access to a CNC gear checker?

RE: Help! New Engineer Need help identifying CV shaft spline standard

Speedracerfast

(Automotive)

(OP)

6 Jan 20 20:49

Thanks mfgenggear! I am working on getting the mating CV/axle shaft which should be in my hands soon (a nearly brand new one.. super lucky!).

I will come back with my results soon.

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