PTI motar

[krishna071]

Does any one know how PTI motar works in marine gearbox?

[apex1]

Does anyone know what PTI motar is?

[krishna071]

I am talking about the PTI/PTO solution on the gearbox for marine engines. PTI solution facilitates the propulsion to be operated when the main engine is disconnected from the gearbox. I know only that PTI motar can be engaged with the gearbox while main engine is disengaged to move operate the propulsion. BUt I dont know how this PTI motar works

[apex1]

I think you mean MOTOR not motar!?

The PTO "power take off" is easy to understand (damned American disease of using acronyms for everything)

The "power take in" (PTI) is commonly a El. motor, driven by Generator.

Did that help?

Regards
Richard

[wardd]

yea, we should use 500 letter compound nouns

[mark775]

Oh, don't exaggerate...PTI - "Thethingoneattachestotodrivetheboatwhenthemainquits."

[apex1]

You´ve got it Mark! Thank you!

Isntitmucheasiertounderstandthanthe*******acronyms?

[gonzo]

There are many kinds of PTOs. They can be engaged continuosly or not. They can be engaged with a clutch, a spline or hydraulics. They can have variable speed or fixed. The can be reduced or multiplied through the gearbox. They can come right of the crankshaft. They can come off a gear from the crankshaft. They can be chain driven from the crankshaft. They can be belt driven...etc, etc.

[apex1]

Nono Gonzo.

P T I was the topic! There are not many ways. And the most common was mentioned.

[gonzo]

I was barking at the wrong motar :(

[krishna071]

OK, Let me rewrite my question..

I am interested in understanding how Power take-in (PTI) motor is working.

PTI is also called auxillary propulsion drive (APD).

[krishna071]

Richard I understand that PTI is an elec motor operated by generator.. but PTI is driven by the main engine too..So I am confused how it works when PTI drives the propulsion when the main engine is disengaged. Can you elaborate if you know the working of this mechanism?

[mark775]

Interested in a near-silent electric auxiliary (to not disturb wildlife), I approached ZF with this question a few years ago and they brushed me off. I assumed I would have to wait until I got my hands on a broken one or buy new... please post if you find anything. - Mark

[apex1]

Richard I understand that PTI is an elec motor operated by generator.. but PTI is driven by the main engine too..So I am confused how it works when PTI drives the propulsion when the main engine is disengaged. Can you elaborate if you know the working of this mechanism?

No krishna,
the main engine is coupled to the gear in the common way.
A gearbox with pto has just a shaft coming out the box where you can "draw" some power. Means, couple a hydraulic compressor or something the like.
If the gearbox is designed to RECEIVE power through such a shaft (the common PTO cannot!) we say PTI.
That is a second "power in" shaft and a second coupling.
On some MIL. vessel setups you find PTI´s which operate simultaneously with the main to provide additional power.
More common is, that the main is´nt coupled when you use the PTI input.
A "coming home" propulsion, or the useage intended by Mark, is such a case.

Although a PTO is quite cheap and widely used for many applications (from watermaker through El. generation, `til Hydraulic setups), the PTI gearbox is not. It is a expensive piece of metal.

Mark, ZF should have several off the shelve boxes for your application.

Regards
Richard

[wardd]

if we all speak in acronyms does that mean richard wont understand?

[gonzo]

All gearboxes have an input and output shaft. As I understand it the post is about a secondary input shaft. Am I right?

[apex1]

Of course Gonzo

[wardd]

if the input and output shafts were eliminated the gear box would be lighter and longer lasting not to mention no oil leaks

[apex1]

if the input and output shafts were eliminated the gear box would be lighter and longer lasting not to mention no oil leaks

Let me know if you need such gearbox, I know who can make you one....:cool:

[wardd]

i need one for the concrete sub i have on order

[apex1]

Gonzo takes orders on that. But prepaid due to possible law issues.

[gonzo]

We can tint the cement on any color you request.

[wardd]

how about a color that would be easier to find on the bottom?

[kistinie]

if the input and output shafts were eliminated the gear box would be lighter and longer lasting not to mention no oil leaks

Yes !

Flywheel are now the rotor of the electric motor.

Just one clutch is needed. (http://www.heinzmann.de/index.php?option=com_docman&task=doc_download&gid=976&lang=en)

[krishna071]

Thanks Richard, that was useful

[apex1]

Thanks Richard, that was useful

Welcome Krishna!..:)