Transmission total parts

First... Your dealer representative is clueless and just outright ignorant and has no business telling
anyone, anything. He's trying to impress you with his LACK of knowledge

This guy knows what's involved

 

You have a c, so your transmission is different in detail from other Prius but as principles, this is dead on

 

Ask him to name the parts. I think the official names are the Thingamabob, the Wazizit, and the drain plug.



(PS. He probably got told the transmission uses three planetary gears and somehow that became three parts.)

 

Oppps! That's an older one. Here's the latest one that includes the C

 

There's a whole series of videos about the Turbo-Encabulator at Turboencabulator - YouTube

I particularly like the service technician's description of service procedures in the second half of

 

Great thread here.
Personally I think that everyone who shops for a Prius should ask the salesperson if the Prius C utilizes Turbo-Encabulator technology just to see what they say.

 

The dealer was wrong, there's 5 parts, there's also the Whozis and the Whatchamacallit.

 

very cool show of toyota engineering at it's finest!

 

Different in a LOT of details.

First, there is NO CHAIN.

Second, the PSD is in two integrated parts, as on certain Lexus hybrids:

1a) ICE/MG1 side, which has the MG1 powering the sun gear,

1b) ICE/MG1 side, which has the ICE powering the carrier gears, which are now THREE in number, not four as on earlier Priuses,

2a) MG2/Fixed side, which has the MG2 powering the sun gear,

2b) MG2/Fixed side, which has fixed carrier gears, and which are now FIVE in number,

3) first output gear, which is common to both 1b and 2b (the carrier gears of both sides power the internal gears of the compound gear)

4) the outside of the compound gear which is the first output gear,

4) second output gear, powered by the compound gear, and powering the final drive gear,

5) final drive gear, which, in turn, drives the differential.

The carrier gears on each side are different in teeth counts, thereby better matching the expected and required RPMs of the MG1 and the MG2, with their quite different demands, to, ultimately, the final drive gear, and then on to the wheels.

IOW, the ratios between the MG1 and the MG2 to the compound gear are different.

The internal oiling system is also quite different.

I would expect that, ultimately, a scaled-up version of the Prius c transmission/transaxle will be incorporated into the larger Priuses.

 

wow, that's a lot of differences for a smaller car that gets about the same mpg's as the lift back.

are there any advantages?

 

The two electric motors AND the ICE may each be independently "tuned" to their most economical operation points.

Specifically, the MG1, which has a dual role as a starter motor for the ICE and as a charger for the battery, amongst other functions, may be tuned to a different operating band than the MG2.

This is seen in the somewhat different internal diameters of the compound gear sides.

The MG1 is operated at a lower ratio so that the maximum speed of the vehicle may be increased (really, just a slight increase, as its ratio is changed from 1.0 to about 0.9). The MG2 is operated at a higher ratio so its maximum power may be improved (really, a very significant increase as its ratio is changed from 1.0 to about 2.5).

The widths of the carrier gears is different, too, and this reflects less power being routed through the MG1/ICE side (and why this side has three narrower planet gears on its carrier, and which gears have a finer pitch), with more power being routed through the MG2/Fixed side (and why this side has five wider planet gears on its carrier, and which gears have a coarser pitch, about double the pitch of the MG1/ICE side).

Starting about 10 or so minutes into the Weber State (Utah) video on YouTube, the new two-sided Gen 3 HSD is dissected by the instructor (the first 10 minutes discusses the Gen 1 and Gen 2 HSDs, to emphasize the differences between the Gen 1 and Gen 2 HSDs (one planetary gear set, both with a chain) and the Gen 3 HSD (two planetary gear sets, without a chain, as helical gears are employed for this first stage of gear reduction).

It is an impressive, independent presentation, and shows how far Toyota has come from the Gen 1 and Gen 2 HSD technology.

The new Gen 3 HSD, in a somewhat larger package, is also used in the Highlander and Camry hybrids.

The lubrication system of the Gen 3 HSD has also been changed, with ATF as the fluid, and no external cooler.

 

interesting, but i wouldn't be surprised to see something completely new and much more efficient.

 

So my dealers service manager told me there is no trans service info in my owners maintenance book for my 2014 Prius c because they never require maintenance. Is this true? Is there no lubricant or filter?

 

There is no filter. A drain and fill of the transaxle is the only way to get suspended metals out. Always open the fill hole before the drain hole.
There is ATF WS as a lubricant/coolant. In my Gen 2 3.5 quarts, the c may be different.

Toyota has no official replacement interval but owner experience hints it gets dirty early then stays somewhat clean. I recommend a drain and fill at 30,000 miles, then at 90,000 miles then every 90,000 miles.

Besides the 4 quarts of ATF WS, you will want two crush washers at the dealer, about $40 total, if you have the dealer do the service, about $110. (obviously, this will be some other dealer)