Hi,
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Originally Posted by nash
Very interesting - I did not know a compound gearing was used on the TCH. A tech at the dealer said the TCH uses an isolated cooling circuit for the HSD, independent from the ICE cooling. I am most curious if anyone has any info on the cooling of the TCH. Is the temperature of the HSD lower than the ICE? Heat buildup in the Prius HSD is a limitation and possibly a contributor to the early breakdown of the HSD oil. A few folks have had oil analysis done on the Prius HSD oil at 60K miles, and it showed significant breakdown and loss of viscosity.
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I can not answer about the TCH system but only the Prius I appears to have the problem. The current model, Prius II, does not have this problem after Toyota added some ball bearings and started using a lower viscosity transmission oil. No doubt the TCH benefits from this 'lessons learned.'
Bob Wilson