Rotary expansible chamber devices – Intermittently accelerated and receding members rotate in... – Each a working member
Patent
1989-01-10
1990-07-03
Koczo, Michael
Rotary expansible chamber devices
Intermittently accelerated and receding members rotate in...
Each a working member
418156, 418157, F04C 500, F04C 2324
Patent
active
049386689
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rotating piston machine with a casing, with a shaft borne in the casing, with an annular space, in which two rotating elements are arranged and against the walls of which, in which intake and discharge openings for the working medium are provided, the rotating elements bear in sealing manner, each rotating element having four radially outwardly extending sector-shaped vanes, the two rotating elements being arranged coaxially and their vanes engaging in one another in such a way that in each case one vane of the one rotating element is arranged between two vanes of the other rotating element, a cam track control being provided, by which, on rotation of the shaft, both rotating elements execute rotations with cyclic changes in the speed of rotation and in the distances between the vanes of the two rotating elements, and the cam track control having inner cam rings which are connected fixedly in terms of rotation to the shaft.
Various rotating piston machines are known, which all have, however, various disadvantages. In particular, the problem of balance frequently occurs, so that the known rotating piston machines frequently run very out of round, which on the one hand causes vibration and noise, and on the other hand also subjects the bearings to very high stresses.
Various disadvantages also occur in the case of a known rotating piston machine of the type mentioned in British Patent Specification No. 299,767. As can be convincingly deduced from simple geometrical considerations, the guidance of the rolling elements between the inner cam track and the outer rollers cannot take place there without play. This is not possible with any cam geometry of the inner cam track. The force transmission via the variously borne rollers is very small, so that only a low efficiency can be achieved which is out of all proportion to the moved masses. No interaction takes place in the region of the load changes, that is to say the reversal points of the cam track; there are dead points there. The bearing of the rollers is not described and obviously not solved. Owing to the said problems, it must be expected that a rotating piston machine corresponding to the citation would run at least very unevenly and have a low efficiency.
The object consists in creating a rotating piston machine which operates very effectively and with which essentially no problems due to uneven running occur.
The solution according to the invention consists in that the cam track control has outer cam rings which are connected fixedly in terms of rotation to one rotating element, that in each case four of the rolling elements roll between one inner cam ring and one outer cam ring each, and rolling elements which are displaceable in radial direction, held undisplaceably in circumferential direction by a cage connected to the casing, and that two pairs of inner/outer cam rings per rotating element are provided with corresponding rolling elements.
By the cam track control according to the invention, the two rotating elements can be set in motion in such a way that, on their rotation, the volume of the working spaces on both their sides is changed cyclically in accordance with intake and discharge openings, so that the desired mode of operation is achieved.
The force transmission takes place in this case by the shortest route in each case via two cam track surfaces. The flux of force is ensured at every point of the cam track. Play-free running is also ensured. The cam geometry can in this case be designed in such a way that uniform acceleration values are achieved, as a result of which the acceleration torque can be reduced.
Eight rolling elements per rotating element are constantly active and free from play. The force transmission takes place both by lifting work of the rolling elements and by traction between the cam tracks and the rolling elements (i.e. rolling of the rolling elements on the cam tracks).
The rotating piston machine can in this case serve, on the one hand, as a compressor, for example for gases. It can, however,
REFERENCES:
patent: 1458950 (1920-02-01), Poirmeur
patent: 1874308 (1928-10-01), Kolko
patent: 1920201 (1930-10-01), Kolko
patent: 1950228 (1931-04-01), Dedieu
Koczo Michael
Savio, III John A.
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