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Unread 25-08-2011, 08:16
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Re: pic: Automatic Tensioner

Mentioning motorcycle timing chain tensioners reminded me of another automatic tensioning system! The engines that I have taken apart all used a timing chain system like this. I'm sure there are many other ways.



The slack chain guide side is tensioned by a hydraulic piston, as seen below.



You can see a linear ratchet and pall system on the piston's shaft to prevent the piston from back-driving and losing tension on the chain. Perhaps a spring or pneumatic piston with a similar ratchet and pall system would work well too... just more food for thought!
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