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high torque and RPM flex drive; advise needed

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Lew_Merrick_PE:

--- Quote from: rschilp on December 04, 2012, 07:56:39 PM ---I like the oldham coupling, I even have some nice pieces of Nylon material that may make a good center disc.

How well does the oldham coupling work with a misalignment at an angle?

--- End quote ---
It depends on the size of the coupling and material used for the compliant insert.  5° of misalignment is the generalized book value -- though I have used them as high as 12° with elastomeric inserts.

BillTodd:
I'd have thought you be better off with a conventional pair of UJs and a short shaft, with perhaps a second pair between the blower and the engine block to take the torsional load.

If engine and blower are tightly coupled,  perhaps an Oldham coupling would be fine, but it may try to force itself apart at the slide and any significant misalignment will result in vibration (how would you lubricate it?)

Bill

[edit]

If the blower is close coupled these look ideal:

http://www.darossi.com/supercharger-store/supercharger-coupler.html

rschilp:
I'd seen that coupler, it goes between the shaft of a small (really a baby) supercharger and the pulley where the belt drives it.

My supercharger is MUCH bigger (read more torque required) and does not have a belt, the main shaft of my supercharger is lined up with the crankshaft of the engine (low and in the front) so I need a straight through coupler. The engine will be mounted on rubber bushings, the supercharger will be mounted to the engine, with a rubber mounted support on the rear. The overall length of the setup, from rearmost engine mount to supercharger is 7 feet, with rubber mounts on both ends and the front of the motor (~4ft from the back) I don't think I have the space (or the weight) to rigid mount the supercharger. So a slight angular and linear misalignment may occur under heavy load or acceleration.

The conventional pair of universal joints would be great, but not enough space for the ones that can handle the load, so I need something a bit more elegant. Some of the earlier posts have good ideas that I'll build as a prototype sometime soon once I get back to the shop.

phillip:
How bout this?


http://www.lovejoy-inc.com/

John Hill:
No doubt the CV joints from a FWD car have been suggested by maybe the inner joint would be better as they (usually ?) include clearance for things to slide in and out a bit.

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