Re: transmissions

Posted by Bob M on February 05, 2003 at 05:52:40 from (165.170.128.66):

In Reply to: transmissions posted by charles macleod on February 05, 2003 at 04:17:10:

Interesting idea Charles! However speaking as a mechanic who has worked on both tractors and racing bikes for 30+ years, I can list several reasons why it won't work:

1 - A derailleur (the proper name for this type of multispeed bike transmission) is NOT truly power shift capable. The rider must "soft pedal" - continue to rotate the crank without applying any load - to shift successfully. Shifting under load is difficult to accomplish. And when it is done it can result in chain breakage, chipping of sprocket teeth, etc.

2 - A derailleur can accommodate power flow in one direction only: From the power plant to the wheels. An overhauling load - like when going downhill with the wheels driving the engine - will hopelessly tangle and destroy a derailler. (Ask any biker who has had their freewheel jam...)

3 - The "engine" on a bike is very low powered, operates at low speed, and delivers it's power smoothly. A reciprocating engine on the other hand delivers power as a rapid series of sharp impulses. Also a tractor transmission must deal with shock loads - slipping wheels and the like. These conditions do not favor derailleurs!

4 - A derailleur requires frequent adjustment, cleaning and lubrication to work properly. Not a good feature for a tractor transmission.

Thus while perfect for a multispeed bike, derailleurs would not be much good for a tractor...

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