lock up torque converters

[quadcam boat]

Can anyone explain to me how the lock up torque convertor works on the crown gearbox?

Do all 1uzfe engine and gearbox combinations have a lock up torque converter?

Thanks,
Andrew

 

[cseufert]

Yer all the A34xE & A35xE gearboxes that you would ever find on the back of a 1UZ have a lock up torque convertor.

Theres a solonoid in the valve body, when activated, changes the pressure in the toqrue convertor, which makes it lockup (im pretty sure 2 plates come into contact with one another, i think there key'd).

 

[quadcam boat]

How does oil pressure go in and out of the torque convertor? Sorry, I know nothing about 'autos!

 

[MacroP]

How does oil pressure go in and out of the torque convertor? Sorry, I know nothing about 'autos!

The transmissions's input shaft is hollow, hence a path for oil to travel.

 

[quadcam boat]

So there is only one oil gallery into the torque convertor? To engage and disengage the locking mechanism, all that happens is the oil pressure in this gallery varies?

I have a friend going to cut one up, so I will get a picture of the actual lock up mechanism inside when he gets it apart.

 

[cseufert]

Yer, the fluid does return back into the gearbox between the input and oil pump shafts.

Im not too sure what the variable pressure achieves, but im assuming it has something to do with the smoothness of the lockup/unlock process.

 

[Meldge]

What is "Lock-Up"?

Does this allow manual shifting of the auto or is it something esle?
If it is manual shifting, I take it this can be changed on the fly...?


Meldge

 

[Zuffen]

Torque converter "lock up" is where the usual slip that occurs in a torque converter is eliminated.

Essentially it is like a conventional clutch. Once engaged you have 100% power transmission and 100% engine braking available, as long as the lock up remains in force.

It improves performance an fuel economy.

Whoever invented it is a legend.