Rotary expansible chamber devices – With mechanical sealing – Seal on working member periphery separates inlet and outlet...
Patent
1984-04-26
1987-05-19
Koczo, Michael
Rotary expansible chamber devices
With mechanical sealing
Seal on working member periphery separates inlet and outlet...
123246, 418142, 418159, 418204, F01C 1902
Patent
active
046663835
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to rotary machines that have a fluid chamber of changing volume, as in an engine or a pump.
Rotary machines of this type employ a rotating surface to have a working relationship with a fluid, e.g. compression or expansion. In the case of an engine, the machine also generates shaft energy as where a compressed gas and fuel mixture is ignited for explosive expansion within the chamber of the machine.
Prior rotary machines have typically employed one eccentric rotor or multiple adjacent rotors that turn in opposite directions so that adjacent rotor surfaces move in the same direction; however, machines having rotors turning in the same direction have been suggested.
SUMMARY OF THE INVENTION
In detail, the invention applies to a rotary machine which comprises a rotor and means defining a bore surface with which the rotor is arranged to interact to cylically define a fluid chamber during rotor rotation.
According to the invention, a variable member defining a portion of the bore surface is movable toward and away from the rotor in the manner to vary the rotational position of a transition point at which a sealed relationship between the rotor and the bore surface begins or ends, and means responsive to desired operating conditions to vary the position of the variable portion thereby to vary the rotational position of the point at which the sealed relationship begins or ends.
In preferred embodiments, the rotary machine is in the form of a rotary internal combustion engine in which the rotor and bore surface are cooperatively constructed to form at least part of a combustion chamber, the variable member defining with the rotor the point where the volume of the combustion chamber is first closed, variation in the position of the member serving to vary the compression ratio of the engine; and the bore surface is comprised in part of a relatively stationary first bore surface segment of radius which progressively enlarges relative to the radius of the rotor at points at progressively greater arcuate distance about the rotor axis from the point of the segment which lies closest to the rotor, the variable member defining a second bore surface segment which is movable outwardly relative to the first segment and has a transition end portion disposed closely adjacent to the relatively stationary segment, the transition end portion being movable along the first bore surface segment as the variable member moves outwardly from the rotor axis to expose an increasing amount of the first bore surface segment, preferably the variable member is pivotable about a pivot axis lying directly outwardly from the first bore surface segment and, the first bore surface segment is cylindrical, centered on the pivot axis, more preferably the second bore surface segment defined by the variable member is an arcuate surface of radius substantially equal to the radius of the rotor, and the machine further includes a flexible fairing member disposed at the outward end of the variable member, and a positioning means adapted to selectively position the variable means.
In a further preferred embodiment, the invention applies to a rotary machine that cyclically defines a chamber of progressively changing volume by means of a pair of co-acting rotors. The rotors are mounted for dependent rotation on parallel axes of adjacent cylindrical bores formed in a block, the axes being spaced apart a distance less than the sum of the radii of the bores. The rotors have surfaces adapted to provide a progressive rotor-to-rotor seal while each rotor also forms a rotor-to-bore-wall seal and face-to-end-closing-surface seals, the rotor surfaces in cooperation with the other surfaces of the machine defining the chamber.
According to the invention of this preferred embodiment, in combination, the rotors rotate in the same direction, a cylindrical surface of the first rotor, of radius substantially equal to the radius of its bore and having substantial arcuate extent, is arranged in sealing relationship with its
REFERENCES:
patent: 3707340 (1972-12-01), Brille
patent: 3721510 (1973-03-01), Gilbert
patent: 3904332 (1975-09-01), Clough
patent: 4296936 (1981-10-01), Wankel
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