Internal-combustion engines – Rotary – With compression – combustion – and expansion in a single...
Reexamination Certificate
2001-05-29
2002-10-01
Denion, Thomas (Department: 3748)
Internal-combustion engines
Rotary
With compression, combustion, and expansion in a single...
C123S0430AA, C418S261000, C418S264000, C418S176000, C418S136000
Reexamination Certificate
active
06457450
ABSTRACT:
TECHNICAL FIELD
The invention relates to internal combustion engines, in particular to rotary engines whose working members make oscillatory motions about an axle fixed on a rotor.
Known is a rotary internal combustion engine, comprising a rotor having radial-longitudinal posts and longitudinal blades swivel-mounted in the area of their external diameter, which blades have carriers that contact a guiding means, the rotor being positioned in a cylindrical body limited at its end faces by lateral walls and having an inlet opening and an outlet opening, a working chamber being defined by the external surface of a longitudinal blade, the cylindrical surface of the body and by the lateral walls of the body. A coaxial driven shaft is provided having additional radial posts and bell cranks articulated to the rotor working blades. (USSR Inventor's Certificate N 1518555 IPC F 02 B 53/00, published 1989).
BACKGROUND ART
The air in the engine is compressed by rotation of adjacent blades of the rotor and rotation of the driven shaft about the posts when a cam is subjected to being rolled upon by a follower roller of the adjacent blades' articulation.
A drawback of the known invention is the presence of an auxiliary driven shaft, which, furthermore, rotates at a variable velocity with respect to the driver shaft rotation angle, which makes the construction of this device complex. It should be noted that in this solution, as in many internal combustion engines, only the exterior side of the blades (one side of a cylinder in piston internal combustion engines) participates in the work cycle. From the point of view of the work cycle, the space under the blades is not utilized.
This drawback is eliminated in another technical solution, namely, in a rotary internal combustion engine that comprises a rotor having longitudinal flaps that are swivel mounted thereon in the area of the external diameter along its rotation axis and separate one from another the spaces arranged therein on both sides of each of the flaps, and which rotor is installed in a cylindrical body on whose end face wall is disposed a closed oval-shaped guide in contact with the carriers of the flaps, and a conduit for gas-exchange between the spaces located on both sides of the flaps. The end face surfaces of the flaps and the surfaces of adjacent posts that contact the end face surfaces of the flaps are conjugated, contact one another, each of the flaps separating the compression space from the working space. Suction and exhaust openings are provided. (U.S. Pat. No. 5,261,365, NPC 123-241 published 1993; U.S. Pat. No. 5,345,905, NPC 123-241 published 1994).
A feature of this solution that is advantageous is that both sides of a flap participate in the work cycle of the engine, one side participating as a compression space wall, the other participating as a working space wall.
This technical solution has a number of substantial drawbacks. The carriers are made in the form of cylindrical pins on the end face surfaces of the flaps. This results in that in such an arrangement there will always be gas leakage occurring through slits in the rotor wall and in the body wall. An attempt to reduce these leakages in U.S. Pat. No. 5,261,365, NPC 123-241, published 1993, and U.S. Pat. No. 5,345,905, NPC 123-241, published 1994 by thickening the flap wall results in a decrease of the volumes of the working spaces and the compression spaces.
As a result of the fact that the carrier pins are fixed to flaps (made as an integral part of the flaps) and transmission of the working forces to the engine is effected through these pins, then their design has to be stronger and they necessarily have to be positioned on both sides of the flaps. Otherwise, if the pins are positioned on only one side, they have to be made much bigger, which will result in increased leakage. Furthermore, in the case where the pins are disposed on one side of a flap end face, the flap may be affected by skewness, seizure, and even a failure of the engine may occur. Strengthening the pins and increasing the rigidity of the flaps by increasing their size is also unacceptable here, since this will result in a reduction of the working volumes of the engine.
Another drawback is that in such an engine the carrier is situated in a high-temperature zone, it cannot be cooled well, and acceptable working conditions for the carrier-guide groove friction pair cannot be provided.
A very substantial drawback of the solutions disclosed in U.S. Pat. No. 5,261,365, NPC 123-241, published 1993 and U.S. Pat. No. 5,345,905, NPC 123-241 published 1994, is that the guide for the carriers, which is made in the form of grooves on the end face walls of the body, has a complex shape. This results in that with such a groove:
a) it is virtually impossible to achieve a sufficiently high frequency of engine rotor rotation;
b) it is technologically difficult to attain high-precision manufacture and high quality of the groove surface. The material of which this part should be made, should, on the one hand, be easily machined and be sufficiently ductile in view of being subjected to impact loads, and, on the other hand, should have very high hardness so that it would be capable of working for a lengthy period under conditions of continuous friction of the groove-carrier pair.
DISCLOSURE OF THE INVENTION
The object of the invention is to create a guide of such a shape, that it, while providing good smoothness of travel of a carrier thereon, would be simple to manufacture with high quality of the working surfaces. Achievement of this object makes it possible to obtain high frequencies of engine rotor rotation.
Additional objects of the invention are to create normal working conditions for the carrier-guide pair as regards temperature, lubrication quality, and, furthermore, to obtain a torque on the engine rotor that is also due to the reactive force obtained during waste gas exhaust (by use of a turbo-effect).
This object is attained in that in a rotary-turbine internal combustion engine comprising a rotor having longitudinal flaps that are swivel-mounted on the rotor in the area of the external diameter along its rotation axis and separate one from another the spaces arranged therein on both sides of each flap, the rotor being positioned in a cylindrical body on whose end face wall is arranged a closed guide in contact with carriers of the flaps, and a conduit for gas-exchange between the spaces disposed on both sides of the flaps, a guide therein and disposed on the end face wall of the body being made as an annular guide, and its longitudinal axis is set with an eccentricity relative to the rotation axis of the rotor. This object is also attained in that the annular guide is made in a floating ring that is coaxial with the guide and is positioned on the end face wall of the body.
The invention is novel in that the guide, disposed on the end face wall of the body, is made annular and its longitudinal axis is set with an eccentricity relative to the rotation axis of the rotor, the guide may be made in a floating ring that is coaxial with the guide and is positioned on the end face wall of the body, for example in the form of a groove extending to the end face of the floating ring.
Furthermore, the invention may be provided with the following features:
a) for a rotor having an end face wall—each carrier is made in the form of a crank positioned outside the wall and rigidly connected to a flap, so that the axes of rotation of the crank and the flap swivel coincide, and a second end of the crank contacts the guide;
b) a second end face of the rotor is made to directly contact the second end face wall of the body, which wall is provided with a suction opening that connects to a space under a flap, and further is provided with an inlet and an outlet of the gas-exchange conduit, the inlet of the gas-exchange conduit being disposed opposite the space under the flap in the area of the minimal distance between the flap and the rotation axis of the rotor, and the outlet of the gas-exchange conduit being d
Denion Thomas
Luzhkov Jury Mikhaylovich
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Trieu Thai-Ba
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