Hybrid Car – More Fun with Less Gas

1 millionth Prius sold in the USA - Page 25

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Posted by Elmo P. Shagnasty on April 14, 2011, 9:44 pm

You throw that out, and yet those two sentences have absolutely nothing
to do with one another.

And yes, the Prius absolutely does have a transmission.  It's not
mechanically the same as what's in a Chevy Malibu (for example), but
there is a mechanism to transmit--get it?--power from the power source
to the wheels, accommodating the needs of both.

That mechanism sits in the middle, and--here's another problem with your
assertion--it requires periodic maintenance.

Why would you say that it *doesn't* require periodic maintenance?  Oh, I
see--you're under the impression that there's no mechanism that
transmits power from the power source to the wheels, accommodating the
needs of both.

Well, you're wrong on both counts.

Posted by David T. Johnson on April 15, 2011, 3:02 pm
Elmo P. Shagnasty wrote:

One requires maintenance...the other does not.  That's what we're
talking about...

Well, the Prius has what Toyota calls a 'power split device' that uses a
planetary gear and pinion gears to drive the wheels with the gas or
electric drives but there are no step gears as the Prius has only one
'gear ratio' due to its electric drive.  Most importantly, there is no
clutch or torque converter in the Prius as there are in non-hybrid
vehicles with 'manual' or 'automatic' transmissions as the Prius wheels
are always connected to the planetary drive setup.  This reduces the
mechanical inefficiency and consequent heat generation.  As for
maintenance, there is no Toyota recommended service interval for the PSD
on my Prius although some owners have been concerned about the change in
PSD fluid appearance after a certain number of miles.  Toyota switched
to a new PSD fluid for newer Priuses that may be better suited to the
PSD operating conditions.  Time will tell.

See above.

Posted with OS/2 Warp 4.52
and Sea Monkey 1.5a

Posted by Daniel who wants to know on April 15, 2011, 7:18 pm

False, there is no such thing as "PSD fluid" as Toyota T-IV and WS fluids
are both used in other conventional transmissions.

Also the recommendation to change it at 30k for the T-IV in the NHW11 and
60k for the WS in the NHW20 is based on lab analysis not just the visual
appearance of the fluid.

Posted by David T. Johnson on April 16, 2011, 1:14 am
 Daniel who wants to know wrote:

Not false.  I didn't say that the lubrication fluid recommended by
Toyota for the Prius PSD was exclusively for PSD use.

Noted...but Toyota is not recommending a fluid change for the 2nd gen
Prius at 60K miles.

Posted with OS/2 Warp 4.52
and Sea Monkey 1.5a

Posted by Elmo P. Shagnasty on April 15, 2011, 8:10 pm

So it is your assertion that the mechanism that transmits the power from
the engine to the wheels on a Prius never needs maintenance.


OK, so why don't you start by telling us exactly what maintenance the
Corolla transmission, for example, needs?

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