JPH07310557A - Rotary type internal combustion engine - Google Patents

Abstract

PURPOSE:To convert the heat energy of combustion gas in an exhaust stroke to the kinetic energy of a piston without any waste. CONSTITUTION:A disc-like rotor 4 is fitted in a cylindrical housing 2, and a rotary shaft 10 combined with the center of the color 4 is rotatably supported with both end walls of the housing 2. At least one cylinder 5 opening on the circumferential edge of the rotor 4 is formed within the rotor 4. A combustion chamber is defined between a piston 6 fitted into the cylinder 5 and the housing 2. Both ends of a pin penetrating through the piston 6 and perpendicular to the rotor 4 are engaged with elliptical guide grooves 22 provided on both end walls of the housing 2 and surrounding the rotary shaft 10. The rotor 4 is rotationally driven by intermittent combustion of fuel in the combustion chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type internal combustion engine having no crank mechanism, and more specifically, a disc-shaped rotor fitted in a cylindrical housing having a cylinder formed therein and a piston fitted in the cylinder. The present invention relates to a rotary internal combustion engine that performs intake, compression, combustion expansion, and exhaust strokes of an air-fuel mixture in a combustion chamber between the housing and a rotor, while the rotor makes one revolution.

[0002]

2. Description of the Related Art In an internal combustion engine having a conventional crank mechanism, thermal energy generated by combustion of fuel is converted into reciprocating motion of a piston through thermal expansion of combustion gas, and the reciprocating motion of the piston is rotated by a crank mechanism. Has been converted to. In the above-mentioned internal combustion engine, the movements of the piston in the compression stroke and the expansion stroke are not independent, the compression ratio and the expansion ratio are structurally equal, and the bottom dead center of the piston exists in the middle of the expansion stroke. Energy is not fully utilized for the reciprocating motion of the piston and is released to the outside. In order to convert all the thermal expansion energy into the movement of the piston, the expansion ratio becomes larger than the compression ratio, but in reality, the movement of the piston is hindered by the flow resistance of the combustion gas.

[0003]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to make the movement of the piston in the exhaust stroke and the compression stroke independent so that the heat energy of the combustion gas in the exhaust stroke is not wasted. It is an object of the present invention to provide a rotary type internal combustion engine capable of being converted into kinetic energy.

[0004]

In order to achieve the above object, the structure of the present invention is such that a disk-shaped rotor is fitted inside a cylindrical housing, and a rotary shaft connected to the center of the rotor is mounted on the housing. At least one cylinder, which is rotatably supported on both end walls and opens to the peripheral edge of the rotor, is formed inside the rotor to define a combustion chamber between the piston fitted in the cylinder and the housing, and to penetrate the piston. Further, both ends of the pin perpendicular to the rotor are engaged with elliptical guide grooves surrounding the rotary shaft provided on both end walls of the housing, and the rotor is rotationally driven by the intermittent combustion of the fuel in the combustion chamber. .

[0005]

According to the present invention, the piston is fitted in the cylinder provided in the rotor, the combustion chamber is defined between the piston and the housing, and intake, compression, combustion expansion of the piston occurs while the rotor makes one revolution. Perform each exhaust stroke. The combustion of fuel may be spark ignition or self-ignition. The elliptical orbit that locks the pin of the piston causes the piston to reciprocate as the rotor rotates. The elliptical orbit gives the piston an optimum moving speed and stroke so that the thermal energy of the combustion gas is efficiently converted into the kinetic energy of the piston.

When the stroke of the piston in the expansion stroke is extended and the expansion ratio is made larger than the compression ratio, the heat energy of the combustion gas is sufficiently absorbed by the piston, and if the exhaust port is provided with guide vanes, the combustion gas The reaction force generated when flows along the guide vanes exerts a rotational force on the rotor.

[0007]

1 is a front sectional view of a rotary internal combustion engine according to the present invention, and FIG. 2 is a side sectional view of the same. The rotary internal combustion engine is composed of a cylindrical housing 2 composed of a pair of left and right divided bodies 2a and 2b, and a disc-shaped rotor 4 fitted in a cylindrical portion 3 of the housing 2. The housing 2 is provided with an intake port 13 and an exhaust port 12, and the exhaust port 12 is provided with a large number of guide blades 12a curved in a V shape at equal intervals in the circumferential direction. A rotary shaft 10 that couples the rotor 4 via a key 9 is rotatably supported by both end walls of the housing 2.

The rotor 4 is formed with a cylinder 5 in the chordal direction which is separated from the axial center by a predetermined distance. In the illustrated embodiment there is one cylinder 5, but preferably a plurality of cylinders is formed. The cylinder 5 has a rectangular cross section, and a piston 6 having the same cross section is slidably fitted in the cylinder 5 and the piston 6.
And the combustion chamber is partitioned between. The chamber between the inner end of the cylinder 5 and the piston 6 is kept at atmospheric pressure. The outer end of the piston 6 is cut into an arc along the peripheral wall of the cylindrical portion 3.

A pin 7 parallel to the rotary shaft 10 is passed through the piston 6, and both ends of the pin 7 are engaged with elliptical guide grooves 8 provided on the inner surfaces 3a and 3b of both end walls of the housing 2. Therefore, when the rotor 4 rotates, the pin 7 moves into the guide groove 22.
And the piston 6 reciprocates inside the cylinder 5.

Next, the operation of the above rotary type internal combustion engine will be described. As shown in FIG. 3, the piston 6 reciprocates two times while the rotor 4 makes one rotation, and each stroke of expansion, exhaust, intake, and compression is performed. In FIG. 3A, the piston 6 is at the end of the compression stroke, and when the fuel in the combustion chamber is ignited by the spark plug, the piston 6 is pushed into the back of the cylinder 5. As shown in FIG. 3B, the forward movement of the piston 6 is restricted by the engagement between the pin 7 and the guide groove 22, and exerts a rotational force in the arrow x direction (FIG. 2) on the rotor 4.

As shown in FIG. 3C, when the piston 6 reaches the end of the expansion stroke (bottom dead center), the combustion chamber of the cylinder 5 communicates with the exhaust port 12. As shown in (d) of FIG. 3, when the combustion gas in the combustion chamber passes through the curved passage between the guide vanes 12 a of the exhaust port 12, it is throttled and exerts a reaction force on the piston 6, and the reaction force of the piston 6 is A rotational force in the direction of arrow x is applied to the rotor 4.

As shown in FIG. 3E, when the piston 6 reaches the top dead center, the combustion chamber passes through the exhaust port 12 and communicates with the intake port 13. When the piston 6 moves forward, the air-fuel mixture is sucked into the combustion chamber, and when the piston 6 reaches the bottom dead center, the compression stroke of the piston 6 starts. When the piston 6 reaches the top dead center,
The compressed air-fuel mixture is ignited, and the expansion stroke starts again.

In the embodiment shown in FIG. 2, an elliptical guide groove 2 is provided.
Although 2 is symmetric with respect to the rotation axis 10, as shown by the chain line in FIG. 2, if the stroke of the piston 6 in the exhaust stroke is made larger than that in the intake stroke, the combustion gas in the expansion stroke is increased. Energy is sufficiently opened by the piston 6 and absorbed by the rotor 4. That is, the PV diagram of the heat cycle is represented as shown in FIG. 4, and the output of the engine can be increased.

In the embodiment shown in FIGS. 5 and 6, the housing 2
The disk-shaped rotor 4 fitted in the cylindrical portion 3 is formed with four cylinders 5 extending in the radial direction and having a circular cross section at equal intervals in the circumferential direction. A pin 7 that traverses a piston 6 having a circular cross section fitted in each cylinder 5 is provided on both end walls of the rotor 4, penetrates a slit 21 extending in the longitudinal direction of the cylinder 5, and is provided on the inner surface of both end walls of the housing 2. Is engaged with the elliptical guide groove 22. The housing 2 is provided with an intake port 13 and an exhaust port 12 that communicate with the cylindrical portion 3, and an ignition plug 23 that projects into the cylindrical portion 3 is provided.

The intake stroke, compression stroke, expansion stroke, and exhaust stroke of the piston 6 are arranged at equal intervals in the rotation direction of the rotor 4, and combustion of fuel in the four cylinders 5 is continuously achieved. In the illustrated embodiment, the guide groove 22 has an elliptical shape,
As described above, the guide groove 22 corresponding to the expansion stroke has the rotating shaft 1
By approaching 0, the stroke of the piston 6 in the expansion stroke is made longer than that in the compression stroke, and the thermal energy of the combustion gas in the exhaust stroke is not wasted.
Can be converted to kinetic energy.

[0016]

As described above, according to the present invention, the disk-shaped rotor is fitted inside the cylindrical housing, and the rotary shaft connected to the center of the rotor is rotatably supported on both end walls of the housing. At least one cylinder opening at the periphery of the rotor is formed inside the rotor, a combustion chamber is defined between the piston fitted in the cylinder and the housing, and both ends of a pin penetrating the piston and perpendicular to the rotor are formed. , Engages with an elliptical guide groove surrounding the rotary shaft provided on both end walls of the housing, and drives the rotor by intermittent combustion of the fuel in the combustion chamber, and does not have a crank mechanism. The structure is simple, and the size and volume of the engine body can be greatly reduced.

By making the expansion ratio larger than the compression ratio, the heat energy of the combustion gas can be converted into the kinetic energy of the piston without waste during the exhaust stroke.

By setting the elliptical orbit for restricting the movement of the piston to an appropriate shape, an optimum one for the rate of change of volume during fuel combustion, that is, a piston speed corresponding to the angular velocity of the rotor can be obtained.

[Brief description of drawings]

FIG. 1 is a front sectional view of a rotary internal combustion engine according to the present invention.

FIG. 2 is a side sectional view of the rotary internal combustion engine.

FIG. 3 is an operation explanatory diagram of the rotary internal combustion engine.

FIG. 4 is a PV diagram of the rotary internal combustion engine.

FIG. 5 is a side sectional view of a rotary internal combustion engine according to a second embodiment of the present invention.

FIG. 6 is a front sectional view of a rotor of the rotary internal combustion engine.

[Explanation of symbols]

2: Housing 3: Cylindrical part 4: Rotor 5: Cylinder 6: Piston 7: Pin 9: Key 10: Rotating shaft 12: Exhaust port 12a: Guide vane 13: Intake port 2
1: Slit 22: Guide groove 23: Spark plug

Claims (4)

[Claims] 1. A disc-shaped rotor is fitted inside a cylindrical housing, and a rotary shaft connected to the center of the rotor is rotatably supported by both end walls of the housing and is opened at least in the peripheral edge of the rotor. One cylinder is formed inside the rotor, a combustion chamber is defined between the piston fitted in the cylinder and the housing, and both ends of a pin that penetrates the piston and is perpendicular to the rotor are provided on both end walls of the housing. A rotary internal combustion engine, characterized by being engaged with an elliptical guide groove surrounding a rotary shaft to drive the rotor to rotate by intermittent combustion of fuel in the combustion chamber. 2. The rotary internal combustion engine according to claim 1, wherein a central axis of the cylinder is orthogonal to a radial line passing through an axis of the rotor. 3. The rotary internal combustion engine according to claim 1, wherein the piston of the cylinder performs one heat cycle by one rotation of the rotor. 4. The rotary internal combustion engine according to claim 1, wherein the elliptical guide groove is asymmetric with respect to the rotation axis, and the stroke of the piston in the exhaust stroke is longer than that in the compression stroke.