Monday, October 10, 2011

PLANETARY GEAR, AMAZING INVENTION - CAPT AJIT VADAKAYIL

Have a look in the video below. 

It shows a basic planetary gear. This is what is used in cars for gearbox transmissions.



When I was writing a SMS manual for my company at Singapore, I suddenly felt the need to have some inspiration.

I wonder if you understand what this word inspiration can mean or do.

Two decades ago, one of my Marine Superintendent friends , took me to his home in Mumbai. He wanted me to meet his 16 year old son , and read his poetry.  Though he had got his poems vetted by some Hi Fi internationally famous poets working some some national Indian magazines and newspaper Indian Express, he knew only hard core Capt Ajit Vadakayil will give him everything cut and dry, without mincing words.

So I had dinner with his family and then he gave me the poems to read.  His wife and his 18 year old daughter were all eyes and ears.

Half way through, I asked the boy. "Have you fallen in love yet , son?"

My friend had already warned his family, " With Ajit, anything can be expected. No bombshell is too big when it comes from him!"

The boy said " No , uncle ".

So i had my final word " Your poems are good, but they lack intensity. I suggest you wait till you fall in love or get your first crush-- and then you will understand what I mean!. You need to polish the poems "

Needless to say all were so disappointed.

But then this is who I am -- not very good in calling a spade a shovel.

Now getting back--

One of the Engineering Superintendents was travelling to inspect a ship in USA, and he would be back after 3 days. I asked him to get a ERMETTO COUPLING from the ship's engine room workshop.

Now , an ermetto coupling is an amazing piece of engineering . It is a coupling which can connect two metal pipes together to handle enormous hydraulic pressures usually around 280 bars on a ship. Two bars air pressure , is what you fill in your car tyre.

Unfortunately it so transpired , that the superintendent had to travel further to another ship with an engine emergency, and he would be delayed for another 10 days.

So I took one of my friends , to a toy store , bought off a toy race car , paid 32 dollars for it, and then broke it up there itself and came back to the office with just the transmission, which contained the planetary gear.

The Chink shop keeper and my friend were looking at me as if I was crazy.

I am sure both would not understand what a PLANETARY GEAR means -- or the amount of intelligence which has gone into its invention.

Then I came back to my cabin in office and did some real creative work.

Every time my work stuttered I would play around with the planetary gear, and this was the laughing stock of the office--Ajit deriving inspiration from some bullshit toy car gears.

Now let me talk about technology--

My first encounter with planetary gears was on A class ships of SCI, made in Warnemunde , Germany , which had heavy Valle derricks and Jumbo derrick , which had planetary gear in them-- this was in the seventies.

Since nobody understood this high tech system, there used to be lot of derrick damages, with naive officers putting gear in neutral without parking the super heavy boom.

At that time I remember telling myself-- these gears are meant for the next century and that too in race cars-- not on ship's lifting gear, meant to be operated by simple sailors.


See the picture above--

The black OUTER GEAR is RING GEAR
The green  CENTRE GEAR is SUN GEAR
The three yellow INTERMEDIATE GEARS are called PLANETARY GEARS.

You hold one gear stationary, input drive power into the second gear and take output drive torque from the third--as simple as that. And you can choose which to hold stationary which to input and which to take output from , as per your choice.




What are the advantages?

Outstanding power transmission, compactness, high efficiency, increased torque capability, great stability due to uniform load distribution, multiple kinematic combinations and co-axial shafting, .


Net time you sharpen a pencil, try and figure out how it works.




CAPT AJIT VADAKAYIL
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2 comments:

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  2. Hello, I love reading through your blog, I wanted to leave a little comment to support you and wish you a good continuation. Wish you best of luck for all your best efforts. gear coupling manufacturers, gear coupling manufacturers in India.

    ReplyDelete