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Discussion Boards > Active Subjects > Messages as Posted > Car Tires and Maintenance Forum

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 06-18-2009, 20:17 Post: 163495
hardwood

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Location: iowa
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  What are Continuously Variable Transmissions CVTs

The CVT design I'm familliar with all goes back to Henry Ford's planetary gear design with a few modifications.
OK, picture in your mind the common planetary gear arangement.

Sun gear in the center.

Planet gears in mesh with teeth on the sun gear and in mesh with teeth on the inside of the ring gear.

Ok, now if the ring gear is held in a fixed position and the sun gear is spinning in the center at a given RPM, the power is being sent out thru a bracket and shaft holding the planet gears in place. The
RPM of the output shaft connected to the planet gears will be less. The "RATIO" of input shaft to output shaft determined by how many teeth are on the sun, planet and ring gears.

Now same design as I described above only now what happens if the ring gear is not held in a fixed position while the gearset is running and can be spun in either direction at varying speeds by means of teeth on the outside of the ring gear? You are varying the ratio of the gearset while in use = CVT. The ring gear is being spun in either direction at varying speeds by a hydraulic motor to get the travel speed, (RATIO), you want.

OK, put two or three of the systems I described in series sending power from the first to second to maybe even a third gearset with the variable speed ring gear, pretty simple basic design.

Some may argue that the hydraulic motors are transmitting some of the power, perhaps they are but it would be minimal compared to the power being transfered thru the gearsets.

Clear as mud. Frank.






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 06-19-2009, 07:39 Post: 163500
hardwood

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  What are Continuously Variable Transmissions CVTs

KW, before hydros came along combines used the variable speed belt design you describe. WE never had much trouble with them, but more maintenece was involved than hydros.






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Discussion Boards > Active Subjects > Messages as Posted > Car Tires and Maintenance Forum

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