Half a croissant, on a plate, with a sign in front of it saying '50c'
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Wankel wan-a-be

Reverse the concepts of a standard engine
  [vote for,

Think of a solid block cylinder shaped (acting as the block of a standard engine) with say 5 – 6 holes bored out through its length in a circular pattern, with an additional tube down the centre (similar to the magazine of a revolver gun).

Each of the outer tubes would act as cylinders, and the central tube as the ‘hub’ as well as the inlet and exhaust ports. Within each cylinder there would be two pistons one on each side. Attached to each outer end of the pistons would be a roller mechanism (replacing the con-rods).

At the outer edges of the main block would be rotated sine shaped cylinders / blocks i.e. one end has been shaped to go up and down if something is rotated around its central point.

Sorry to bore or confuse you so far, but its a bit difficult to explain.

The idea being that the main block rotates with the outer sine shaped block remaining stationary, the roller mechanism on the pistons is pushed against the sin shaped block thus as the main block is rotated the pistons are pushed in and out creating reciprocating motion.

To replace the valves of a standard engine - the central hub would be fixed, so as the main block is rotated around it this would line up two holes say as each of the pistons are being pulled outwards thus replicating the induction stroke of a standard engine. As the main block is rotated more, the holes are no longer aligned and the compression stroke begins (the pistons being pushed in by the incline of the sin shaped block) at x degrees after ‘TDC’ of the sine wave, the mixture is ignited throwing the pistons outwards against the decline of the sine block, thus providing power to rotate the main block (and ultimately the output shaft) with the momentum the pistons are then pushed in again (pushed against the incline of the sine block), at the same time the exhaust hole are lined up on the central hub and the gases are expelled, only to repeat the cycle again.

The sine wave on the outer block could be repeated X number of times so that X number of cycles could occur on one rotation of the main block. Also each cylinder would be firing (with 6 cylinders - 360 / 6 -) 60 degrees after each other creating a very smooth torque curve.

Variable compression could be incorporated by altering the height of each sine wave (for example the exhaust stroke could compressed completely to expel all the gases by making that sine ‘crest’ slightly higher than the others) or by moving the outer blocks in our out. Also variable valve timing could be incorporated by turning the inlet / outlet hub slightly.

The number of moving parts would be drastically reduced and the RPM could be considerably higher, it would also be far more compact, although cooling could be difficult unless a turbine was incorporated and cooling fins on the main block.

Sorry it a bit long winded, but I hope you can understand the basic concept.

baldross, Sep 17 2002

(?) Dyna-Cam Engines http://www.dynacam....esign_overview.html
200HP [Klaatu, Oct 04 2004]

OX2 Engine http://www.ox2engine.com/
Swash Plate Engine [dsprop, Dec 03 2004]

Open-head 4 Open-head_20Four
another idea with opposing cylinders [5th Earth, Dec 03 2004]


       Could you add some paragraph breaks, please? It's just too hard to read this.
waugsqueke, Sep 17 2002

       Sorry guys English was never a strong point of mine. A bit dyslix - dislexik - dyslexic - You know that word - cant spell and stuff (why did they make it so hard to spell !!!!)
baldross, Sep 17 2002

       I know, I've just finished e-mailing them asking for a job !!   

       I got the idea about 3 years ago after dismantiling a Hydralic pump for a tracked excavator.   

       The idea grew, but it looks like some one beat me to it.   

       It seemed to work quite well too, Oh well back to the drawing board !!
baldross, Sep 17 2002

       I think your right UnaBabba   

       Although my concept used a sine 'crank' at each end and two pistons for each cylinder, maby twice the power - but then again probably not !!
baldross, Sep 17 2002

       Would the hydraulic pump you disassembled happen to be an axial piston swash plate by any chance? Arrange the pistons *radially* and your forces are more balanced- check out the hydraulic "ring-cam" motors made by the likes of MacTaggart-Scott and Hagglunds. Your instrinsic gearing ratio could be much higher with this arrangement although breathing might be compromised.   

       Bear in mind this excerpt from the OX2 annual report: "Our net loss since inception (September 23, 1996) is $7,398,001"
shameless_self_reference, Sep 23 2002

       It's been done! I have seen your idea in a working proto type years (maybe as many as 20) ago. The backyard mechanic / machinist had built it from scratch and had it running in a Ford Fairmont or something like that. I think it was in Popular Science or a similar publication. He reported remarkable torque, power and economy out of a very small displacement and lightweight engine.
edzspace, Dec 03 2002

       hi baldross can you please write me my mail is makala04@bih.net.ba i want to ask you something about your idea or anybody who knows his mail please let me know thank you a lot.
makala, Feb 29 2004

       Try this <link>
Klaatu, Feb 29 2004

       check out the link I posted. This type of motor is being backed by Carrol Shelby, and is called the OX2. Its a swash plate idea, and works similar to an a/c compressor in some cars.
dsprop, Dec 03 2004

       Closer rereading of these idea shows concepts similar to the open-head engine idea posted here a while. I'll see if I can find a link to it--the ideas are different enough not to overlap but there are a few points of similarity.
5th Earth, Dec 03 2004


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