1:48pm 05-06-2018

Feliks

In other forum :
Posted Today, 10:46

Greg Locock, on 06 May 2018 - 06:13, said:

"You think that 15% of the IMEP is absorbed in sidethrust on the pistons? Don't think so, most of the FMEP is piston rings."

Well, unfortunately this is not true ... But so far people have thought so ... If you liked playing with a calculator, which I published a few posts above, then you probably already knew how much the reaction of the piston to the cylinder ... Publishes again with my setting value, and clearly see that this force reaches even 30% of the value of the force giving the torque .. derived from the combustion of fuel .. Contrary to appearances, the force of pressure on the piston ring piston is small compared to this force, because it is in the pressure of relatively the small force coming from the bending of the piston ring, which, as you probably know, we can easily squeeze with fingers ... ..... So that the force in comparison to the force of lateral force is many times smaller, if the engine performs heavy work .. And is independent of the load of the engine, it has practically constant value ... independent of the engine load.
Here you have a screen shot in the picture, because as you can see, you do not like to play with calculators.

http://mechanicalexpressions.com/explore/statics/crank-slider-torque.html
http://mechanicalexpressions.com/explore/statics/crank-slider-torque.html

3:09am 05-06-2018

Feliks

Principle of operation of a 6 cylinder engine with a crosshead, Watt type, Peaucelier or Feliks line crosshead .. So what gives us ... no friction piston by cylinder, so we can give up the oil for lubrication (oil pumps too), and gives 15% torque increase. Possibility of excellent cooling of the pistons with water, which will increase the compression ratio by 2 units. this is the next 10% .. Well, ecology, no oil burning, and less NOx, because in the chamber lower temperature ..

And the lack of crankshaft, because one crank with the connecting rod is hardly called a shaft ... if the engine has 16 cylinders .. :rolleyes:



http://www.railroadhandcar.com/projects/video-files/keystone-family.mp4

1:49am 04-22-2018

Feliks

Peaucellier Due crosshead ..

1:49am 04-22-2018

Feliks

Had the twilight of long crankshafts ready to be ready ... ?



The connector between the arms as they will have the diameter of the main bearings of the main crankshaft, this should be enough....

1:48am 04-22-2018

Feliks

Always every two connecting rods and two cranks on the crankshaft in a 4 cylinder engine are always less .. :cheesy:

5:25am 04-18-2018

Feliks

It's best to see in such a drawing .. so dead force can only give one's place on the casing in one place ... only pivot is in the place, which gives very little resistance to movement on a flat plane .. an element loaded with this force ..

8:04pm 04-15-2018

Feliks

Here are a few more alternatives..

Such animation, so that we know what we are talking about ..



Well, here's the crosshead but it's applied to my new 4 stroke ... we gain a lot ... for my experience with this engine, we now get 1 liter capacity of the main piston, about 300 hp at 5000 rpm.
Of course without NOx, because the pistons will be cooled with water ..
Well, that's what to fight for ...

8:03pm 04-15-2018

Feliks

And nowadays, how to design an engine that will save 10% of fuel in the ship's engine, because there is no friction in its traditional crosschead, then here you can see and count how much it can be ...

https://en.wikipedia.org/wiki/Slow_steaming

8:03pm 04-15-2018

Feliks

Which to use?
This is a good question ..
With a new construction a lot of unknowns ... here is one but also a new 3 ways to connect the connecting rod ..
And not only the mathematics of movement, but now all force must be determined ...
A lot of work for sure ..



I wonder where this side force acting in the crosshead has died?

6:51pm 04-12-2018

Feliks

Historical notes
Sylvester (Collected Works, Vol. 3, Paper 2) writes that when he showed a model to Kelvin, he “nursed it as if it had been his own child, and when a motion was made to relieve him of it, replied ‘No! I have not had nearly enough of it—it is the most beautiful thing I have ever seen in my life.’”



Which of these three mechanisms to use ... and here the magnitude of the lateral force on the piston in the C-spot ... as you can see on 1/3 of the torque it achieves .. THEREFULLY IT WILL NOT BE HERE ... :clap:

http://mechanicalexpressions.com/explore/statics/crank-slider-torque.html

9:12am 04-11-2018

Feliks

Does not this remind you of the mechanics drawn by James Watt ? But it's necessary to back 250 years back ..


Hand-drawn diagram by James Watt explaining his discovery of the "parallel motion" in a letter to his Sohn: "The idea originated in this manner. On finding double chains, or racks and sectors, very inconvenient for communicating the motion of the piston-rod to the angulat motion of the working-beam, I set to work to try if I could not contrieve some means of performing the same form motions turning upon centres, and after some time it occured to me that AB, CD, being two equal radii revolving on the centres B and C, and connected together by a rod AD, in moving through arches of certain length, the variations from straight line would be nearly equal and opposite, and that the point E would describe a line nearly straight, and that if for convenice the radius CD was only half of AB, by moving the point E nearer to D, the same would take place; and from this the construction, afterwards called the parallel motion was derived."

Of course, instead of a rope, you can use any type of parallel movement mechanism.

https://en.wikipedia.org/wiki/Parallel_motion

And of course, it's getting higher and higher speed after that ...

So this Wats is not bad anymore .. but this string can have such a form of springs from the watch's bannister .. and then it is the simplest solution and guaranteeing higher revolutions .. obviously the ideal is Peaucellier-Lipkin, but also is the most complicated .. But after some analysis, to which the arms attach to the connecting rod, i.e. which carries the main forces, the rest may not have to be a monstrous size ..
In any case, the use of a traditional crosshead certainly became archaism ... because with the use of any of these solutions, the side force on the crowd does not occur, and was not moved below, to crosshedas, and was liquidated at all ..

Also from my drawing you can see that a very easy way we can do cooling with the water of the piston ..
This can give us, due to its very low temperature, a change to Teflon efflorescence and one would be tempted to completely give up the oil.
And this is a very important matter, which allows us this construction, so it seems to me that maybe you can do practically this matter and try some teflon bearings and seals

https://en.wikipedia.org/wiki/Peaucellier%E2%80%93Lipkin_linkage



Here is the animation of THE PEAUCELLIER-LIPKIN LINKAGE which is automatically downloaded

http://kmoddl.library.cornell.edu/tutorials/05/

Normal position engine crosshead Peaucellier-Lipkin :rolleyes:

2:43am 04-10-2018

Feliks

So I continued to divide the hair into four...

Yes, we slowly develop this way of bypassing the lateral force of the piston .. here, that's all you have to do is one lever that has a half-ring at the end, but the other way round. This way one pulls up and the other down during the movement of the lever ... It can be used for a full four-stroke engine .. Well, see how easy we can cool the water piston ..

2:44am 03-28-2018

Feliks

Nice video, and at the end you can see how fast it can turn...

7:09pm 02-18-2018

Feliks

A traditional crosshead, usually unbalanced, to save a little on the construction .. But for this, when the command "whole back" is taken for the ship's engine, only 60% of the power can actually be used, because of this unsymmetrical crosshead, which can not withstand greater load, in the reverse than usual turnover.
In my solution, it does not matter which engine the engine is on, so "the whole back" can actually be "all", i.e. 100% ..

But in my solution, it may be asymmetrically, for the same reason as in the traditional one, it means that the piston is pressed down all the time, if not by the work stroke, then by the compression stroke ... (of course, it is 2 stroke ) .. Therefore, the second lower frame, can be "symbolic" and the thin line, just to keep the kinematic bond in some abnormal situations.
Of course, all this new mechanism can be in a separate housing, separating the oiled space, from the space under the piston, which can be cooled water ..
Developing further ideas for smaller engines, instead of a rope, we can use a toothed belt, whose durability is known from the mechanisms of timing .. But the revolutions can be a little bigger ..





http://www.dtic.mil/dtic/tr/fulltext/u2/821500.pdf Here is a handbook, but it is very long uploading, because 35 MB .. On the 74 page, such a two-stroke engine, whose piston pin, is a ball, which moves only pressure from above in a pristine way ..



Andrew

7:05pm 02-18-2018

Feliks

Or so very quiet?

https://www.youtube.com/watch?v=ZYI5ORbX8g8

Or some game ...

https://www.youtube.com/watch?v=heMCodsfl9w

Or maybe such a rope made of such a chain or a timing belts ?
Half milion ibs ...

https://www.usarollerchain.com/240-4-Quad-Strand-Roller-Chain-p/premium-240-4-10ft.htm

https://www.youtube.com/watch?v=myXCwpYyywg


Andrew

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