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high torque and RPM flex drive; advise needed
rschilp:
Need some design help.
I'm building a somewhat customized '32 Chrysler 3 window coupe. The powerplant is a 1934 Pierce Arrow designed 462ci V12 and came originally from a 1941 Seagrave firetruck. I've mounted a 6-92 blower (inline 6, 92ci per cylinder) in line with the crankshaft of the engine to be driven from the crank directly.
This is very similar to the design that the blower bentleys used in the late 1920's and the Potvin design from the 1960's. I don't have many blower bentleys around to study and copy designs from and the potvin model was based on a custom timing cover and a rigid mounted blower. My intent is to make the blower somewhat flexible mounted from the engine, allowing for some movement.
What kind of linkage / flex drive could I put between the crank and the blower?
For reference; operating range will be 800 to 3,200 rpm and the engine with the blower and injection will put out in excess of 500 ft lbs of torque.
And as this thread is useless without pictures I've added some, the bentley is from the collection of Ralph Lauren, the others are my project.
75Plus:
You might consider adapting a CV joint from a front wheel drive car. Torque handling would be more than adequate and less than perfect alignment would be tolerated.
Joe
rschilp:
--- Quote from: 75Plus on December 04, 2012, 09:52:11 AM ---You might consider adapting a CV joint from a front wheel drive car. Torque handling would be more than adequate and less than perfect alignment would be tolerated.
Joe
--- End quote ---
Joe, that's a great idea, but I think those are a little too long? I've only got about 4" of total space between the blower snout and the face of the balancer on the crankshaft. If I move the blower further out it will hang out beyond the fenders and past the bumper.
David Jupp:
Depending upon how the whole things is supported, you might also need to allow for lateral mis-alignment as well as angular. A single CV joint will be great for angles, I'm not convinced how well it will handle things if the two axes don't intersect at a point in centre of the joint (others can probably advise better than I can).
A gear coupling could be very robust and compact - they can tolerate minor misalignments of both types. Because they have many teeth, the torque transmitting capability can be high.
rschilp:
--- Quote from: David Jupp on December 04, 2012, 10:26:18 AM ---Depending upon how the whole things is supported, you might also need to allow for lateral mis-alignment as well as angular. A single CV joint will be great for angles, I'm not convinced how well it will handle things if the two axes don't intersect at a point in centre of the joint (others can probably advise better than I can).
A gear coupling could be very robust and compact - they can tolerate minor misalignments of both types. Because they have many teeth, the torque transmitting capability can be high.
--- End quote ---
My best design so far is a double gear with a chain. Two gears closely lined up with a doube roller chain going around both. I think that is what you are refering to here as well.
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