Alfred Evert
Excenter-swing-maschine   -   Animation

Constructional elements and motions
Essential elements here are shown by surfaces between circles of different colour. Picture at left will show approach with resting cylinder, right side cylinder will turn too. Turning here clockwise is assumed. The radius drawn will mark each position of the parts.

The black circle will mark the rotor-arm (RT), which here is shown at its starting position (upside) and (below) twice turned by 60 degrees.

That surface between black and blue circles, the excenter-ring (ER) will mark. At restling cylinder (left), it will but make swinging motions with small radius. Here all its mass points but move some downwards and to right side.

However, when the cylinder will turn too (right side), this motion of the excenter-ring will be overlayed by that turning of cylinder. A ´tumbling´ motion will result, mass points will move at spiral tracks.

That surface between blue and red circles, the excenter-sickle (ES) will take. At resting cylinder (left), all its mass points will move at circle tracks. Main mass all times will be opposite of the rotor-arm. Thus the excenter-sickle will turn synchron to the rotor-arm, both with same angles speed, the excenter-sickle however with different absolute speeds (cause turning around the excenter-axis).

When the cylinder will turn too (right), this turning motion around the excenter-axis will be overlayed by turning around the system-axis. Thus outward- and inward bended spiral tracks will result. Above this, absolute speed of mass points will differ remarkable (inside slow, outside very fast).

That surface between red and green circles, the cylinder (ZY) will take. Left it is shown resting at its position. Right side, the cylinder will turn by 15 degrees while turning of each 60 degrees of the rotor-arm.

Motions at resting cylinder
Here at first, motions at resting cylinder are shown. When one looks at the black circle, that steady turning of the rotor-arm around the system-shaft (grey circle) one can see. Both at a whole, practically a crank-shaft will be.

That blue circle, but will swing by small radius, its wide side always will show to right side. This excenter-ring thus will but control motions of excenter-sickle.

That surface outside the blue circle towards the red circle, motions of excenter-sickle will show. That sickle will turn at large radius, synchonously to the rotor-arm, masses positioned opposite all times.

As mentioned above, that pressure from the rotor-arm will result co-turning of cylinder. Here one may see this pressure in shape of that ´rolling´ of blue circle within the red circle. Decisive however will be, inertia of excenter-sickle will have very different space to move towards each vektor of centrifugal forces. Moving towards inside, motions are limited by axis, there is no space to fly away. Moving towards outside, inertia will have (relatively) free space, at a large radius, by taking the cylinder with, to move nearby each tangential direction. Here that pressure of inertia will show to right-side-upside.

So, concept of this maschine automatically will produce co-turning of cylinder. Turning speed of cylinder however will be far slower than turning speed of rotor-arm.

Motions at co-turning cylinder
Now here, motions are shown when the cylinder does turn too. By every turning of 60 degrees of rotor-arm, here is assumed resp. is shown each 15 degrees turning of the cylinder.

The rotor-arm (black circle) like above will turn constantly around the system-axis (grey circle). The excenter-ring (blue circle) here not only will swing at narrow circle track, but will show ´tumbling´ motions. Here it´s obvious, mass points of excenter-ring now also will swing from inside towards outside and back. Now also these mass points do show very different absolute speed. Thus here, also these mass points of excenter-ring no more will have balanced inertia forces. So also the excenter-ring will show a resulting pressure-component towards outside with positive effects discussed above.

One may see here for example, that blue circle downside will but run once alongside the green circle, but will be positioned most time upside. This motion does look like ´milling´, pushing again and again into same direction, pressing the cylinder into circle-movement.

Surface within the green circle will mark the cylinder. Looking at the narrow part of (or at the wide side of, naturally), one can see that slow co-turning of the cylinder (one turn while fourfold turning of rotor-arm).

But hard to follow are these quick motions of excenter-sickle (between red and blud circles). Here, two circle motions do overlay, each with constant speed. Resulting of however, are highly different absolute speeds of mass points. By pressure of excenter-ring, that falling-out will be started, thus high speed (resp. kinetic energy at large lever arm) outside will be achieved. By counter-pressure at the ´wedge´ of cylinder, the cylinder by itself is pressed ahead. Same time mass is guided towards inside and decelerated as well. By the cylinder and excenter-ring too, this additional high energy of inertia will be feed back into the system as a whole.

Energetic swinging
By the rotor-arm, here mass will be started to turning motions. Besides friction, keeping masses in motion (in sum at constant speed), no energy will demand. Already this simple animation here however does shown, which enormous inertia forces thereby will be effected. By this animation it´s also obvious, this swinging all times does prefere and induce motion into same direction: co-turning of cylinder. This momentum at the cylinder, does not correspond to input-power at the system-shaft, not at all. This input is just neccessary to start motions and keep motions going on and on - thus but generating existance of centrifugal forces. That output-power at the cylinder - it´s solely result of inertia.

Evert / 25.03.2000


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