GB2208680A

GB2208680A - Rotary cylinder reciprocating piston machine

Info

Publication number: GB2208680A
Application number: GB8819433A
Authority: GB
Inventors: Avraham Oron; Yohanan Ackerman
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-08-18
Filing date: 1988-08-16
Publication date: 1989-04-12
Also published as: DE3825864A1; IT1225966B; JPH01134001A; BR8804152A; FR2619596A1; SE8802798D0; SE8802798L; IT8883465A0; ES2010019A6; IL83576A0; GB8819433D0

Description

ROTARY ENGINE BACKGROUND AND FIELD OF INVENTION The present invention relates to a novel rotary engine, and more particularly to a rotary piston displacement arrangement where the cylinders are arranged and rotated around the pivot.

The arrangement is novel and unique in respect that the crankshaft, the cylinders and the pistons rotate at constant velocity speeds, each of said parts at its own speed around its own centre.

The arrangement can be applied in the form of an internal combustion engine, an exterior combustion engine, a gas engine, an hydraulic motor, a gas compressor and an hydraulic pump.

Conventional piston operated combustion engines comprise generally a set of pistons which move each within a cylinder and which are connected via a connecting rod with a crankshaft. So as to decrease the total volume of a piston engine, while retaining its performance and its efficiency, there have been proposed engines which comprise rotating pistons, inter alia the Wankel Moter. Here however - arise serious problems of attaining tightness between pistons and cylinders, as well as problems of extremely high wear and tear.

A further type of rotary engine is a type known as "star engine where the cylinders are arranged and pivot around the crankshaft.

Such engines were used for aircrafts but they have no connection with the present invention.

OBJECT OF INVENTION It is the object of the present invention to provide a new design which permits the construction of a relatively small piston engine (as compared with conventional piston engines), wherein the different parts of the engine are fully balanced dynamically, where frictional forces between piston and cylinder are absent (except friction which is due to pressure of packing means onto the cylinder wall) while fully maintaining the necessary tightness between pistons and cylinders.

SHORT DESCRIPTION OF DRAWINGS The invention will now be described with reference to the d Ililt2xL'd dUdWill(JS ill wli i c!i Figs. 1, 2 and 3 illustrate schematically the working principle.

Fig. 4 corresponds to Fig. 1 in greater detail.

Fig. 5 corresponds to Fig. 2 in greater detail.

Fig. 6 is a schematical, fractional view of the engine according to the invention.

Fig. 7 is schematical sectional elevational illustration of the engine according to the invention.

Fig. 8 is schematical cross section thereof.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Turning first to Figs. 1 - 3 the new engine comprises a rotatory cylinder (21), twin pistons (22), and a crankshaft (23). The cylinder (21) rotates clockwise about an axis B with constant angular velocity. The twin pistons (22) which move along the axis E of the rotating cylinder and turn with it, rotate with the crankshaft (23) about axis C. The crankshaft (23) itself turns about an axis D.

The mechanism is designed such that the eccentricity of the crankshaft - the section CD - is equal to the distance between the axis B and D, i.e. BD = CD. Thus, ; ADC = 2 < DEC which means that the angular velocity of the crankshaft (23) about axis D is exactly twice the angular velocity of the rotating cylinder (21) about axis B. So as to avoid jamming the rotating cylinder (21) and the crankshaft (23) are coupled by a set of toothed gears or in any other conventional way.

The new assembly has two different working volumes (26) and (27).

When 3. DBC = Oo volume (26) reaches its minimal value and volume (27) its maximal value. When it DBC increases, so does volume (26) while volume (27) decreases. Whenever f DBC = 180 , the volume (26) reaches its maximal value and volume (27) its minimal value.

At that stage, at which 00 < ' ABC 4 1800 suction takes place and/or positive work at volume (26) and exhaust and/or compression at volume (27). At the subsequent twin 180 < #DBC < 360 suction takes place at volume (27) and exhaust and/or compression at volume (26).

Gas or liquid enters the working volumes through ports (28) and (29) (wherein tightening means are provided) and escape through appropriate different ports.

Turning now to Figs. 4, 5 and 6 which illustrate the above described principle in greater detail, within housing 32 there is placed the cylinder 21 in which twin pistons 22 move creating two working volumes 26 and 27, said twin pistons being connected by means of a connecting rod 34 which rotates about crankshaft 23.

Housing 32 is further provided with an injector or spark plug 33, on the one side thereof, while on the other side thereof intake and exhaust ports 30 and 31 are provided.

The manner in which the engine operates will become apparent from the description of the practical embodiment.

PRACTICAL EMBODIMENT Figs. 7 and 8 depict a two stroke diesel engine with four cylinders and twin pistons, according to the invention.

The engine comprises a casing () to which are attached cylinder casings (8) which rotate about axis E (at velocity W clockwise - see Fig. 1) and a crankshaft (9) which rotates about axis F (at velocity 2W, clockwise). Synchronizing the velocities of cylinders and crankshaftcan be achieved in a known way by toothed gears or otherwise. The cylinders (4) are affixed to the cylinder casings (8) (the axes of the outer cylinders are normal to those of the inner ones).

The crankshaft (9) has four excenters (2) (the value of the excentricity being the same as the distance between axes E and F, the two outer ones (2) being co-axial, while the two inner ones (3) being on an axis which is turned through 1800 to that of the outer ones. At each of the excenters is coordinated a twin piston (5), (1). The twin pistons move lengthwise within the cylinders (4) and rotate togcthcr with tIeiii.

There are opellirlgs (G) in the cylinders where through an excilangtX of fluid takes place. Full tightness - except at the location of openings (6) is achieved by the casings (7), assisted by a packing (12)) The working cycle is as follows: Whenever the piston (5) approaches the uppennost dead point, the opening (6) in the cylinder is in register with exhaust port (15).

Combusted air flows through the two ports to exhaust tube (16) and therefrom to the open. The motor continues to rotate in clockwise direction and opening (6) arrives opposite the intake port (13), compressed air flowing from compressor (10) through intake (14) enters the cylinder (4). With continued movement of the motor the cylinder is sealed and the air in it is compressed. When the piston arrives at the uppermost dead point (position of piston (1)) fuel is injected by an injector (11) and the mixture is ignited with continued movement the pressure of combussed air acts on the piston driving it and so turns the crankshaft (9) and the cylinder casing (8). At the end of the work cycle the cylinder is again at the exhaust port (15) and the process repeats.

Similarly, by changing the location of opening and change of energy supply, the engine can be used as an external combustion motor, as gas motor, hydraulic motor, pump or gas compressor.

It is to be understood that the description illustrates the principle of the invention which could be applied to four or two stroke engine or diesel engine.

Claims

1. A rotary piston displacement arrangement comprising a rotary cylinder, twin pistons and a crankshaft wherein the cylinder rotates about an axis with angular velocity while the twin pistons move along the longitudinal axis of the rotating cylinder and turn with it, rotate with the crankshaft while the crankshaft turns about another axis, characterised thereby the eccentricity of the crankshaft is equal to the distance between the axis about which the cylinder rotates and that about which the crankshaft rotates, resulting therein that the angular velocity of the crankshaft is exactly twice the angular velocity of the rotating cylinder.

2. A rotary piston displacement arrangement as claimed in claim 1, characterised thereby that it is a compressor.

3. A rotary piston displacement arrangement as claimed in claim 1, characterised thereby that it is an internal combustion engine.

4. A rotary piston displacement arrangement as claimed in claim 1, characterised thereby that it is an exterior combustion engine.

5. A rotary piston displacement arrangement as claimed in claim 1, characterised thereby that it is a gas engine

6. A rotary piston displacement arrangement as claimed in claim 1, characterised thereby that it is a hydraulic engine.

7. A rotary piston displacement arrangement as claimed in claim 1, characterised thereby that it is a hydraulic pump.

8. A rotary piston displacement arrangement as claimed in any preceding claim, characterised thereby that it has two different working volumes.

9. A rotary piston displacement arrangement as claimed in claim 3, or claim 8 in combination with claim 3, characterised thereby that it is a two stroke diesel engine having four cylinders and four twin pistons.

10. Rotary piston displacement arrangement, substantially as hereinbefore described and with reference to the accompanying drawings.