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Cranks and Cases
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dpennings



Joined: 10 Dec 2016
Posts: 48
PostPosted: Mon Dec 14, 2020 14:31    Post subject: Reply with quote
Here you can see a crank shaft with Hirth joint:

http://www.ltb-dirkbende.de/Siemens_Bramo_SH14.html
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kmccutcheon



Joined: 13 Jul 2003
Posts: 298
Location: Huntsville, Alabama USA
PostPosted: Mon Dec 14, 2020 14:31    Post subject: Reply with quote
dpennings wrote:
thanks, but I still don't see the difference between the Hirth joint an the Gleason type, maybe some angles are different or other minor geometries, but the principle is the same.?


The "tooth" cross section of both the Hirth and Dusevoir joints is triangular. They are radial with the Hirth joint and cut across the joint surfaces with a rotating cutter, making sequential circular patterns with the Dusevoir.

The Gleason tooth form is an involute spline arranged radially around the periphery of the joint. This is much stronger than the triangular section.

By the way, this thread has gotten WAY off topic. I have split it into a new thread.
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dpennings



Joined: 10 Dec 2016
Posts: 48
PostPosted: Mon Dec 14, 2020 15:09    Post subject: Reply with quote
Well, the Gleason type is a little more rounded, than the Hirth type. The manufacturing process was probably different, I guess somehow the bearing was continuous rotating and the cutter made some complex movement (just up and down would do it) to cut that profile. It could also be a tool with a slightly tilted axis wobbling around like it is used for cutting gears.

Honda used the Hirth type in their famous four stroke racing engine (6 cylinder, 250 cc) in 1966 when split plain bearings were very common, seams like, the Hirth type will do the job.
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