Mayday! Mayday!!!

[raj]

Dear Path_Finder,

My greatest worry with my gravity wheel concept testing was how to achieve the 2:1 speed doubling of the smaller wheel in a simpler way.

You have so, expertly, found the solution, as you showed us in your picture below.
You have already demonstrated your gravity wheel prototype you built, can turn 180 degrees, and you were wondering how to make turn a full 360 revolution.

With the car-pistons principle applied to the inner wheel, you have a WORKING model of our Gravity Wheel.

Raj

[raj]

Here is picture below, showing two sets of pendula working inside the drum wheel.

The weights (in blue ink), swing on the short arms (in blue ink) pivoting on the rim of the smaller wheel and on the long arms (in red ink) pivoting on the rim of the large drum wheel.

Raj

[path_finder]

Dear raj,
The big question is: how to let pass the vilbrequin through the space where the pendula are swinging?
http://upload.wikimedia.org/wikipedia/c ... Cshaft.gif
The vilbrequin will collide in any case with the pendula set.
This is the reason why I never can implement this idea before (http://www.besslerwheel.com/forum/files ... equin1.png)
For TWO sets it's easy (on each side of a disk), but for FOUR you must synchronize the second disk: how do you transfer the speed from the first to the second one?


edited: I found the exact translation for vilbrequin: crankshaft
Your comparison is not fully pertinent because there are TWO attachments per disk. Here is the difficulty: see here the problem with a boxer engine crankshaft: http://fr.wikipedia.org/wiki/Fichier:Bo ... mation.gif

[raj]

Dear Path_Finder,
Our combined gravity wheel design looks VERY GOOD to me.

I believe you are not seeing, as I see it, the path of the weights ( two weights per one of four vertical/parallel compartments of the drum wheel) through a complete revolution.

I am not seeing any problem of ' how to let pass the vilbrequin through the space where the pendula are swinging?'

This question, according to me, does not arise.

Unfortunately, I am good at computer animation, It could have help me explain better.

I sincerely believe WE are near an answer ( good or bad) to our gravity wheel design.

I shall try NOW, to draw as best as I can to explain my point.
I shall be back with a drawing very soon.

Raj

[raj]

Dear Path_Finder,

Let me repeat. I am NO Good in computer animation. That's why I always try to convey my concepts through hand drawings.

Below is first humble attempt in using 'Paint' to draw.

In this drawing, I have tried to show our combined gravity wheel concept as one.

The black ink parts represent your drum wheel.

The thick red ink parts represent your two inner disks, one on either sides of the drum wheel.

The thin red ink parts represent four vilbrequins combination, connected at 90 degrees interval.

The TOTAL red ink parts represent the complete inner wheel.

The light blue ink parts represent your gearing/marbles to get the double speed of the inner disks.

The green and dark blue parts represent two pendula with weights, connected to one vilbrequin and to the outer rim of the drum wheel as per my original design.

You will now appreciate that there is NO way, the vilbrequin will collide with the pendula set, because each vibrequin will move always ahead of its corresponding pendula set, when resetting weights positions.

I hope my explanation can clarify something.

Raj

[raj]

...

[path_finder]

Dear raj,

I understand now why we are not on the same radio frequency: you are forgetting the main bearings of the crankshaft
This is the difference between the theory and the practical reality: in your drawing and in that state your crankshaft will be destroyed after a quarter of turn. You need to provide some landings with bearings (for a four pistons engine they are FIVE) at the locations marked with a cross below.

The crankshaft has a linear axis about which it rotates, typically with several bearing journals riding on replaceable bearings (the main bearings) held in the engine block. As the crankshaft undergoes a great deal of sideways load from each cylinder in a multicylinder engine, it must be supported by several such bearings, not just one at each end.

Think about how to implement this internal bearings and meanwhile to connect all elbows... It's not easy.

[raj]

NO! NO! NO!

Dear Path_Finder,

Look again at my 'Paint' drawing.

Your two inner disks and the four vilbrequins form together ONE unit, that is OUR inner wheel inside the drum wheel.

Your gearing/marbles/rollers turn your two inner disks (as per your build shown above). In other words, your double speed system do not only turn your inner disk(s), but it turns the complete inner wheel (disks cum vilbrequins as one unit)

I do not see the need of the five bearings separately for each vilbrequin, because they do not rotate separately and there is no axle passing through between the two disks, to hold the bearings.

Maybe I am still talking cross-purpose.
My alopogy, if I am.

Raj

[path_finder]

Dear raj,

I do not see the need of the five bearings separately for each vilbrequin

I regret, but it is a mandatory if you want to preserve your crankshaft from any breakdown.
Therefore an additional plane must be inserted between two consecutive pendula sets, supporting a bearing at the center (this is exactly what is made inside a thermal engine, each piston acting in a separated area).

[raj]

Dear Path_Finder,

I think that our combined gravity wheel design can be easily modified and the five bearings inserted just as you suggest.

I am going to draw something to show how I think, it can be done.

Raj

[raj]

Dear Path_Finder,

Here is a drawing, quickly done, of our modified gravity wheel concept.

I hope you can easily follow the drawing.

The drum wheel is physically separated in four vertical compartments by cogs on separate central hubs(in light green ink) with bearings inside.

The four vilbrequins rotate freely and are supported by the three bearings.

Does this modifications make the gravity wheel design mechanically sound?

Raj

[path_finder]

Dear raj,
Before to build a monster, I decided to make a sample of a single cell of the full device.
The two shots give the details, and the short video shows how each cell will be linked to the aside cells.
Don't be happy too much, I suspect a big problem at each end of the four cells assembly.

[raj]

Dear Path_Finder,

I have been trying to download your SWF files all morning ( 4 hours+) but haven't been able to do so.

Apparently the file is corrupt.

What software do I have to use to download and open it.

Raj

[raj]

Dear Path_Finder,

I tried all day, from 6.30 am and now 12.00 midnight, but I could download and open your raj8c.swf file.

What a disappointment!

Raj

[path_finder]

Dear raj,
I'm sorry. The file was not corrupt, but in a specific flash format, not HTML compatible. I hope the next one will be readable by any flash player.
On my computer I use Firefox and gnash under Linux Fedora 17.