Reversing servomotor for Sulzer RTA 48T-B

Going through the licensing process ? Have queries, comments, or do you need an answer to that obscure exam question ? This is the place to post.
benc_1950
Bilge Dweller
Posts: 2
Joined: Mon Apr 20, 2009 12:50 am

Re: Reversible Reduction Gear for Marine Diesel Engine

Postby benc_1950 » Mon Apr 20, 2009 1:10 am

Hy,
I am very interested how reversing servomotor works.
I have a certain project to do about Sulzer RTA48T-B engine and it s reversing servomotor.
Can someone give me any information about this, pictures, animation, calculating of hydraulic equpment...anything.

Thanks

benc_1950
Bilge Dweller
Posts: 2
Joined: Mon Apr 20, 2009 12:50 am

Reversing servomotor for Sulzer RTA 48T-B

Postby benc_1950 » Mon Apr 20, 2009 2:11 am

Can someone help me with this.
Topic is too large to specify my needs on it.
Anything will do.
Maybe after I see some posts, I could tell this is something i need for my project.

Thank you all

User avatar
Madzng
Officer of the Watch
Posts: 130
Joined: Sat Jun 14, 2008 10:01 pm
Currently located: London

Re: Reversing servomotor for Sulzer RTA 48T-B

Postby Madzng » Mon Apr 20, 2009 11:43 pm

Hi Benc_1950

Below is a drawing, taken from the RTA manual, of the reversing servo motor.

The reversing servo motor is only used for the fuel pump cam as the exhaust valve cam shape is identical in both directions and does not need to be moved when reversing the engine.

In the drawing the the fuel pump cam is being driven by the wings identified as item "11" which are attached to the camshaft. The whole assembly is being driven in the direction shown by arrow "DR".

Whilst the cam is in this position space "RA" is kept pressured with oil from the Crosshead LO system through connection "VA".

To change the direction of the engine, oil from the Crosshead LO system is directed through connection "VB" into the space marked "RB". As the cam is is moved the oil contained in space "VA" is released out through connection "VR".

It is important to remember when carrying out a camshaft inspection that there is no pressure in either space "RA" or "RB". Because of this the fuel cam itself is free to move and will do so without warning. This can trap any hands or ther objects which are in the way. This movement of the fuel cam can also cause some worrying bangs to be heard when the engine is turned for crankcase work, and if not prepared can start engineers looking all over for the source.
Wartsila Resersing Servo Motor.JPG
Wartsila Revsering Servo motor
Wartsila Resersing Servo Motor.JPG (89.85 KiB) Viewed 7556 times
Wartsila reversing servo motor key.JPG
key
Wartsila reversing servo motor key.JPG (27.35 KiB) Viewed 7555 times


Return to “Training Room”

Who is online

Users browsing this forum: No registered users and 1 guest