This is a demonstration of the power flow through the planetary gear sets of a Toyota U660 automatic
transaxle this transaxle is founded in 2007 and later Toyota Camrys and Lexus ES350s with the
v6 engine this transaxle is unique in the in that it uses the Ravigneaux gear set with the long and
short opinions which are described in a separate video we have power from the torque converter from
the engine connected to our input shaft this input shaft goes all the way to the back of the trans
clear back here and connects to this housing right here so as I turn this housing the input
shaft also terms inside of this housing the direct multiple clutch housing is the C1 clutch and the
C2 clutch these are clutches that are going to be rotating and turning parts of the planetary
gearset we have the F1 roller clutch that only rotates in one direction we have the B2 brake the
B3 brake and the B one brake these are clutch packs that when they come on they stop these
components from rotating but only one or two at a time depending on which gear we're in the output
to the final drive there's a big drive gear that we had to press off of this to get it apart but it
meshes with the final drive idler and final drive ring gear to propel the vehicle down the road so
our power comes in from the engine any time this spline shaft right here turns the vehicle is going
to be moving and so what I want to do is walk you through the different six different gears
forward and reverse to see how all those are accomplished using the different clutches and
roller clutches so for first gear we are going to apply the C1 clutch that's this clutch right
here and in this demonstration what I've done is I've got some sheet metal screws but I can run
in and grab the housing that the C1 clutch would normally grab the C2 clutch I've got it released
so I've connected the C1 clutch housing which is underneath this housing to this housing that's
connected to the input so we're going to turn the C1 clutch and in first gear we are going to have
the F one roller clutch this one right here it's held solid by the case these big lugs are just
splined right to the case so let's see the engine is going to be turning clockwise in relation to
my demonstration so I'll hold the F1 clutch and I will turn the C1 clutch and what that should give
us is a gear ratio of three point three to one so we'll have to turn this housing three point
three terms to get one full turn of this output so let's give it a shot so here we go we've got one
two and three so three turns of the engine gives us one turn the output to drive the director wins
now I'm going to back that up back to where we were there's one two three X it was three point
three now to shift the second gear we're going to keep the C1 clutch applied but now we're going to
apply the B1 brake this is the B1 brake housing right here so we're going to grab that stop it
from spinning and we'll still turn the C1 clutch now this will give us a gear ratio of 1.91 so we
should turn this C1 clutch 1.9 turns to get one turn of the output shaft here we go so there's
one and not quite to 1.9 turns from the engine to get one turn of the output to drive the wheels let
me back those up so that was 2nd gear now we're ready to go to 3rd gear in 3rd gear we still keep
the C1 clutch applied but now we apply the B3 brake the B3 brakes right here so we're going
to let go of the B1 brake we're going to apply the B3 brake and keep it from turning and that
gives us a gear ratio in 3rd gear of 1.4 terms to 1 so let me get things lined up I'll hold
that from turning I should turn this one a little less than one and a half turns to get one turn of
the output so here we go there's one turn and the less than one and a half turns and we've got one
point four to one gear reduction so that was third gear fourth gear is direct drive on this trans
axle where we have one turn of the input gives us one turn the output and to get that we're going to
apply both the C1 which is already on and the C2 clutch so run the little sheet metal screw
in to turn the C2 clutch so we're just going to turn these two pieces one of them turns the Sun
gear one of them turns to the ring gear and I'm going to let go of all the brakes no brakes are
applied and now we just have one turn in equals one turn out that's direct drive a 1 to 1 gear
ratio now to shift the fifth gear we're going to let go of the C1 clutch so I'll back this little
screw out for my demonstration so that we're just applying the C2 clutch now and we're also
going to apply the B3 brake which is this one as well stop to B3 brake from Spain will turn the
C2 clutch and in fifth gear it's a point seven one three two one gear ratio so we'll turn this
housing about 0.7 turns seven tenths of a turn to get one turn the output this is overdrive so
here we go we've got one full turn of the output and about seven tenths of a turn of the input
okay so that was fifth gear to go to sixth gear we're going to keep the C2 clutch applied and
now we're going to apply the b1 brake which is this brake right here and that should give us
point six terms of the input to one turn of the output so here we go point six yeah it's really
spinning fast at about six tenths of a turn the input to one full turn of the output that's our
sixth gear which is a double overdrive so let's go back to where we began pretty much
got all the labels lined up now let's go to reverse to get reverse we have to apply the
B2 brake and the B three brake at the same time so we're going to stop both of those
from rotating and then we'll turn the input shaft from the engine and since we're going
to be turning it clockwise we're in expect the output shaft to turn counterclockwise so we'll
try to stop both of those from turning I'll turn the engine notice that we're spinning backwards
and then this reverse it up it actually is a really low gear ratio it's a four point
one eight to one so it will take four terms of the engine to get one turn of the output
in Reverse this has been a demonstration of the u 660 e power flow through its gear sets