Exhibitor: Association of Hungarian Inventors - MAFE

Inventor and Invention:


NÁDAS Béla dr: Counter-piston mechanism


1.  The Invention



Counter-piston mechanism


The problem the inventor(s) wanted to solve

In machines having multiple pistons where traditional cranks are used the perfect balancing of mass forces can only be achieved using a lot of pistons. With the present solution a perfect, vibration free run can be provided even in case when two or four pistons are used and, in addition, the stroke length (travel) can also be made easily variable during operation within one moment.



The counter-piston mechanism is a hinged arm construction inserted between the pistons and the crankshaft, the elements of which make an alternating movement together with the pistons.



The counter-piston mechanism inserted between the rotating crankshaft of the machine and the pistons, moving between the upper and lower dead centres, consists of simple elements, inner shafts, arms and hinge joints. The construction of the four pistons, two working chambers unit can lively be understood by means of the following schematic diagram. The diagonal arm fitted with bearings in the disk fixed to the crankshaft transfers the alternating rotary movements to the coupling shaft through a simple hinge joint. The drive now becomes bifurcated mirror-symmetrically and, additional arms and shafts through their alternating, back and forth movement, are transferring the rotary movement phases of the crankshaft to the pistons. In the schematic diagram the timing with the diagonal arm can also clearly be observed how the two driving sides are moving in an exact mirror-symmetrical way.

This is why the structural elements moving in the same plane are absolutely mass balanced in every movement phase. A two piston variant mechanism can also be constructed to provide the same facilities and to have the same principles and, it can also be completed with an additional mechanism not described here that makes the easy variation possible of the piston stroke-length (travel) and the compression ratio of the compression-expansion chamber during its operation. The number of pistons can be increased using members moving in opposite direction. In case of other variants a separate compression-expansion chamber can also be formed, since, it can be located divided at the periphery and/or in the centre space without losing any construction advantages.



With the counter-piston mechanism the piston containing machines can efficiently be used in any kind of actual application. They have promising properties as high speed motors due to their mass balanced and vibration free run. In case of working in pumping mode the stroke length (travel) variability represents a progress compared to the actual constructions.



In addition to the conversion of the alternating movement into rotary movement, the structural elements having highly accurate bearing and mass balancing perform also the distribution of the movements for each piston in a way that the spatial location of the pistons be ideal and, this is why a higher speed, a quieter and a more vibration free run can be achieved as those of the actual low piston number, multiple piston constructions. In counter-piston operation mode the piston movements are reduced to the half of the original in case of the same compression-expansion chamber volume and speed that lowers the tear-and-wear and the losses.


Stage of development.

The prototype development is in course.


Documentation available:

The complete technical documentation is not ready as yet.


2.  The inventor (or inventors)





Self introduction.

The inventor lives in Budapest, he is 53 years old, he is a specialist in internal medicine. As a hobby, for amusement and in his free time he is interested in and deals with the technical questions and the mechanical engineering. He has various inventions.


Owner of the invention?



3.  Protection


Patent Status:

Utility model application registration no.: U0500228



28, 10, 2005


Countries where it is in force



4.      Business intention

The inventor should like to sell the patent utilisation rights.