TC's and manual trans (was: Re: Smooth strategy)

Greg Hermann bearbvd at sni.net
Wed Feb 3 05:52:19 GMT 1999


>Gary Derian wrote:
>>
>> I am defining a torque converter as a device that multiplies torque.  If
>> there are only 2 elements, where does the torque multiplication come from?
>> If one element is attached to the engine and the second element is attached
>> to the transmission, there is no way the second element can have more torque
>> than the first.  This two element thing you are describing may be a very
>> nice device and it may have been called a torque converter but it cannot
>> multiply torque.  For that, you need a reaction member.
>>
>> I never took auto mechanics in high school.
>>
>> Gary Derian <gderian at cybergate.net>
>>
>> >Gary Derian wrote:
>> >>
>> >> A torque converter must have at least three elements.  The extra torque
>> >> comes from the reaction at the stator.  Its the hydraulic equivalent to a
>> >> lever and fulcrum where the extra force comes from the fulcrum.  A torque
>> >> converter is not more efficient than a fluid coupling but it does
>> multiply
>> >> torque when it is slipping adding an extra gear for starts.  At low
>> slippage
>> >> (cruise conditions) the stator freewheels and a torque converter reverts
>> to
>> >> a fluid coupling.  A 4 or 5 element converter would be the equivalent of
>> a
>> >> compound lever.
>> >
>> >Reference Wm Crouse - Automotive mechanics- fifth edition - Webster/Mc
>> >Graw Hill.
>> >Torque converters with only 2 elements DID exist. The definitive
>> >difference between a fluid coupling and a TC is the shape of the vanes.
>> >Note, a 3 element fluid coupling also existed.
>> >
>> >You took auto mechanics in high school - I taught it :}
>	Compared to a straight vane fluid coupling, it did a wonderful job
>-redirected SOME of the oil back onto the turbine instead of colliding
>with the pump. I always considered only the 3 element or more as torque
>converters too, but the fact remains, two element "torque converters"
>did exist - however few.


No way--a two element torque converter is a violation of Newton's laws!!

Regards, Greg





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