Rotating piston machine having cam controlled alternating piston

Details Rotating piston machine having cam controlled alternating piston Rotating piston machine having cam controlled alternating piston

1993-08-05

1994-07-05

Vrablik, John J.

Rotary expansible chamber devices

Intermittently accelerated and receding members rotate in...

Each a working member

418 38, F01C 1067, F01C 1077

Patent

active

053262387

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a rotary piston machine having a casing, having a shaft supported in the casing, having an annular space in which two rotation bodies are arranged and on whose walls, in which inlet and outlet openings are provided for the working medium, the rotation bodies are in sealing contact, each rotation body having sector-shaped paddles extending radially outwards, the two rotation bodies being coaxially arranged and their paddles interleaving with one another in such a way that each paddle of one rotation body is arranged between two paddles of the other rotation body, a cam track control being provided by means of which, on rotation of the shaft, the two rotation bodies execute revolutions with cyclic changes to the rotational velocity and the distances between the paddles of the two rotation bodies, and the cam track control has first cam track control means in the form of first cam rings, second cam track control means in the form of second cam rings and third cam track control means in the form of a cage with, held within it so that they cannot be displaced in the peripheral direction, rolling bodies narrowing conically to both ends, which rolling bodies roll on the first and second cam rings, one of the cam track control means being connected to the shaft and another of the cam track control means being torsionally connected to one of the rotation bodies and the remaining cam track control means being connected to the casing.
In such a rotary piston machine (EP-B1-0 316 346), the cam track control of the rotation bodies takes place in each case by means of two sets of elements which each have an inner cam ring, rolling bodies and an outer cam ring. Two such sets of controls are necessary because the rolling bodies can only be pressed outwards by the inner cam ring over a certain angular range (e.g. 45.degree.) and these rolling bodies then in turn rotate the outer cam ring by the outwardly directed force in such a way that a torque can be transmitted from the inner cam ring to the outer cam ring. Subsequently, the rolling bodies must then be moved inwards again; during this time, no torque can be transmitted from the inner cam ring to the outer cam ring. It is therefore necessary to provide a second set of such a cam track control, which effects the torque transmission in this angular range. The same applies correspondingly, of course, when torques have to be transmitted from the outer cam ring to the inner cam ring. It is obvious that the construction is relatively complicated due to the large number of elements of the cam track control and that increased friction losses can also occur. In addition, the cam rings have a relatively complicated shape so that their manufacture is complicated and expensive.
The object of the invention consists in the creation of a rotary piston machine, of the type mentioned at the beginning, which is more simply constructed.
The solution according to the invention consists in the fact that the rolling bodies are provided with bevel-wheel teeth, in the fact that the surfaces, directed towards the rolling bodies, of the cam tracks of the cam rings are arranged in a rotationally symmetrical area corresponding to the surface of the rolling bodies and are provided with corresponding internal bevel-wheel teeth, and in the fact that, as a maximum, one cam track control with a first and a second cam ring and rolling bodies is provided for each rotation body.
Instead of two of the sets of elements mentioned, only one set remains necessary. The rolling bodies no longer transmit the torque from the first to the second cam ring, or vice versa, by moving outwards or inwards. Rather, they retain their radial position, at least in the main, and transmit the torques by rotation with the aid of the teeth.
In this case, the rolling bodies roll on the relatively narrow cam tracks which protrude from the surfaces of the cam rings directed towards the rolling bodies. These surfaces are located in areas which have substantially the same double-conical shape as the rotation

REFERENCES:
patent: 1701534 (1929-02-01), Knopp
patent: 1920201 (1933-08-01), Kolko
patent: 4872818 (1989-10-01), Takami
patent: 4938668 (1990-07-01), Schukey

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