Internal-combustion engines – Rotary – With compression – combustion – and expansion in a single...
Patent
1994-08-15
1995-05-30
Koczo, Michael
Internal-combustion engines
Rotary
With compression, combustion, and expansion in a single...
418 54, 418160, 418270, F02B 5300
Patent
active
054192927
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a positive-displacement machine in which reciprocating and rotating pistons define between them a variable volume-chamber.
The FR-A-2 651 019 describes a positive-displacement machine comprising four elements connected as a deformable parallelogram. Each element comprises a convex cylindrical surface and a concave cylindrical surface, each centered on one of the articulation axes of the element and co-operating in a sealed manner with the concave cylindrical surface of one of the neighbouring elements and with the convex cylindrical surface of the other neighbouring element respectively. One of the articulation axes of the parallelogram is fixed, and the opposite axis is driven in a circular motion. This simultaneously causes a variation in the angles at the apex of the parallelogram and an oscillation of the parallelogram around its fixed axis. The variation in the angles of the parallelogram causes the volume of a chamber defined between the four convex cylindrical surfaces to vary. The oscillation around the fixed axis enables this chamber to communicate selectively with an inlet port and an exhaust port. A thermal engine is thus created which performs the four strokes (inlet, compression, explosion, exhaust) in a single revolution of a crank.
This machine has the drawback of being relatively big for a given displacement capacity, and of failing to enable very high compression ratios.
The construction of each element requires considerable precision for a high-quality seal to be achieved without mechanical friction becoming prohibitive.
The object of this invention is to offer a positive-displacement machine which overcomes these drawbacks.
The invention is thus directed to a positive-displacement machine comprising, between two flat, parallel faces facing one another, two first opposing elements articulated to two second opposing elements around four articulation axes perpendicular to the said faces and arranged at the four apexes of a parallelogram each side of which constitutes the longitudinal axis of a respective one of the first and second elements, the elements supporting four convex cylindrical walls which between them define a variable-volume chamber, the longitudinal axis of each first element being intersected by the axes of two respective convex cylindrical walls, two lines running in the same direction as the axes of the second elements each being intersected by the axes of two respective convex cylindrical walls, the machine also comprising means of co-ordination connected to two of the elements along two co-ordination axes, the means of co-ordination comprising a crank type system connected to a drive shaft and to one of these two elements to make the parallelogram oscillate between the flat faces and at the same time cause its angles at the apexes and consequently the volume of the chamber to vary, distribution ports being located on one at least of the opposing flat faces to cause the chamber to communicate selectively with an inlet and exhaust depending on the angular position of the crank.
According to the invention, the machine is characterised in that each first element rigidly supports the two convex cylindrical walls whose axes intersect the longitudinal axis of the said first element, in that each convex cylindrical wall forms with the convex cylindrical wall intersecting the same line a pair of cylindrical walls belonging to different first elements, in that each first element has closure means extending between its two convex cylindrical walls, and in that the machine comprises means of dynamic sealing between the convex cylindrical walls of a same pair.
The main function of the second elements is to maintain a constant distance between the centers of the convex cylindrical walls of the same pair.
In other words, everything occurs as if a deformable parallelogram would connect the four axes of the four convex cylindrical walls. Thus the distance between the convex cylindrical walls of the same pair is always the same, whatever the configuration of
REFERENCES:
patent: 3315653 (1967-04-01), Chicurel
patent: 3574494 (1971-04-01), Bellmer
patent: 5004409 (1991-04-01), Nakhmanson
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