Circular Geometry to Elliptical Geometry of the Torus

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97k15004wd
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Circular Geometry to Elliptical Geometry of the Torus

Post by 97k15004wd »

How would this really help in comparison to a fully circular torus? I just don't see a big plus on this......

EMCC
The Torque Converter has been redesigned from a circular geometry to an elliptical geometry of the torus making the converter dimensionaly shorter longitudinally by 12mm and it weighs less. This allows the use of electronically modulated converter clutch lockup strategy that lets the clutch slip continuously under certain driving combinations.

97k15004wd
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Post by 97k15004wd »

Found this:

https://encrypted.google.com/patents/US5029087

Pretty interesting although it doesn't explain the elliptical portion......

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Post by James B. »

It would allow the fluid to be accelerated and decelerated as it is spiraled around. In the narrowest regions it would be at highest velocity but could then slow down to make the sharper turns. I can also see how that change in velocity could be used to extract inertial energy for possibly greater power transfer efficiency. It's an interesting concept.

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Post by CrazyHoe »

x2

It probably reduces wasted energy by reducing rotational inertia while maintaining the same power handling capability.

In fluid dynamics, the higher the velocity, the higher the energy transmitted to the turbine to the tune of cube power, not square!

This is for wind power: The theoretically available power in the wind can be expressed as

P = 1/2 � A v3 (1)

where

P = power (W)

� = density of air (kg/m3)

A = area wind passing through perpendicular to the wind (m2)

v = wind velocity (m/s)

So if wind speed doubles, power increases by a factor of 8.


Here's the patent:
http://www.google.com/patents/US20040128992
With this elliptic ratio torque converter, the ability of the fluid in the stator to transmit movement will not be reduced and high performance will be achieved because the fluid path area of the stator is larger than the fluid path area of the discharge port of the impeller and the intake port of the turbine.

[0017] According to another aspect of the present invention, the relationship between a fluid path area A1 of the discharge port of the impeller and the intake port of the turbine, and the fluid path area A2 of the stator, satisfy the condition 0<(A2−A1)/[(π/4)D12]<0.02.

[0018] With this torque converter, the ability of the fluid in the stator to transmit movement will not be reduced and high performance will be achieved because the fluid path area A2 of the stator is larger than the fluid path area A1 of the discharge port of the impeller and the intake port of the turbine.

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Post by CrazyHoe »

Mathematical Model for Elliptic Torus of Automotive Torque Converter and Fundamental Analysis of Its Effect on Performance
http://www.hindawi.com/journals/mpe/2015/851816/


This prety much sums it up:
The need for efficient space utilization has provided a framework for the design of a 248mm family of torque converters that supports a wide choice of engine and transmission combinations. The axial length of the part and its weight have been substantially reduced while the performance range has been broadened without degradation of efficiency. The new converter operates in an expanded slipping clutch mode. It significantly contributes to the performance and fuel economy improvements of related vehicles.

http://papers.sae.org/2007-01-0241/

97k15004wd
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Post by 97k15004wd »

That is good info. It's amazing - the calculations in the patent!

CrazyHoe
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Post by CrazyHoe »

Image

97k15004wd
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Post by 97k15004wd »

I saw that picture but it could really use a better explanation - maybe with some arrows indicating flow and such....

Here's some fluid modeling software that is free for those interested...

http://www.asimptote.nl/software/fluidprop

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Post by CrazyHoe »

Image

CrazyHoe
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Post by CrazyHoe »

97k15004wd wrote:I saw that picture but it could really use a better explanation - maybe with some arrows indicating flow and such....
Image

Image

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