How do i make a linkage like this:

Wellington · Post by **Wellington** » Mon Jun 20, 2016 11:50 am

This stirling engine has a link in the middle of the piston rod that allows the rod to connect to the crank shaft without bending. how can I make this kind of connection? Unfortunately the vid does not show the engines link at rest.:

https://www.youtube.com/watch?v=5lth920VUbU

Any suggestions?
Wellington

DLantz · Post by **DLantz** » Mon Jun 20, 2016 1:16 pm

how about a universal joint, like the kind used for a ratcheting socket wrench?

Tom Booth · Post by **Tom Booth** » Mon Jun 20, 2016 11:54 pm

It looks like it was made out of some parts from some old shock absorbers. Possibly off a motorcycle.

Wellington · Post by **Wellington** » Wed Jun 22, 2016 2:05 pm

good ideas. thanks chaps.

Post by **Administrator** » Thu Jun 23, 2016 11:55 am

NotJustHotAir · Post by **NotJustHotAir** » Sat Jun 25, 2016 5:23 pm

It's an open form of a cross-head bearing using the chamber seal as the guide. Basically moving the wrist pin (gudgeon pin in UK) away from the piston to the bottom of the piston tail rod. This helps reduce side load on the piston as it travels back and forward. Common element on large marine diesels and older steam engines.

Ian S C · Post by **Ian S C** » Sun Jun 26, 2016 2:40 am

Normally used on GAMMA and BETA motor displacer rods, although I have used a Scotch Yoke instead on a couple of motors.
Ian S C

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How do i make a linkage like this:

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