JP2001065359A - Rotary piston machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize and provide a rotary piston machine which generates little vibration and has its piston make an ordinary rotary motion. SOLUTION: This machine, having four rotary pistons 2 arranged on a circumference with an equal space apart, constitutes the rotary piston 2 by a sectional shape alternately connecting two large/small circular arcs, that is, two circular arcs of 90 deg. center angle and two circular arcs smaller than these circular arcs of 90 deg. center angle, or the sectional shape connecting two circular arcs of 90 deg. center angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary piston machine for use in an internal combustion engine, a pump, a compressor or the like.

[0002]

2. Description of the Related Art Conventionally, piston machines used in internal combustion engines, pumps, compressors or similar devices have been
A reciprocating piston machine is used, but in many cases, it is necessary to convert the linear motion and the rotary motion of the reciprocating piston, which requires a crank mechanism and generates vibrations due to the reciprocating motion of the piston. To solve these problems, it is ideal to realize a rotating piston machine in which the piston performs a normal rotating motion.

As a rotary piston machine, a famous Wankel engine, a cat and a mouse-type rotary, and the like have been devised. Therefore, a mechanism using an eccentric shaft and gears is required, and the rotating pistons of the cat and the ratchet-shaped rotary are special rotational movements while repeating slowing and running by the oval gear, which causes vibration.

There is a gear type pump as a rotary piston machine in which a piston performs a normal rotary motion.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a rotating piston machine which solves the problems of the prior art, i.e., the piston has a normal rotational movement with little vibration, and the movement of the piston and the normal rotation. It is an object of the present invention to realize and provide a rotary piston machine that does not require a mechanism for converting motion by means different from a gear pump.

[0006]

Means for Solving the Problems In order to achieve the above-mentioned object, the present inventor has conducted various studies for realizing the object, and as a result, has found that it can be realized by the method described later. I've reached the point.

The rotary piston machine of the present invention has four rotary pistons arranged at equal intervals on the circumference, and the rotary piston has a cross-sectional shape of two arcs having a central angle of 90 ° (point A in FIG. 1). 1B from FIG. 1B and FIG. 1D from FIG. 1C.
1) and two arcs smaller than this arc and having a central angle of 90 ° (points from FIG. 1A to FIG. 1D and points from FIG. 1B to FIG. 1C).
) Are alternately large and small, and a space formed by using the four rotating pistons is a variable volume chamber.

[0008] The ratio of the change between the maximum volume and the minimum volume of the variable volume chamber becomes larger as the size difference between the large and small arcs constituting the cross-sectional shape of the rotary piston becomes larger, and the difference between the arc sizes becomes smaller. The smaller the ratio, the smaller the rate of change, and the cross-sectional shape of the rotating piston approaches a perfect circle. As a matter of course, since the cross-sectional shape cannot be a variable volume chamber if the cross section is a perfect circle, the above-described difference in the size of the arc is necessary.

[0009] Minimizing the smaller one of the large and small arcs to maximize the rate of volume change of the variable volume chamber substantially reduces the size of the arc to zero. In order to obtain the same result, the cross-sectional shape when the volume change rate is maximized is two arcs each having a central angle of 90 ° (FIG. 4).
4H) from the point G). In this case, the volume of the variable volume chamber formed inside the four rotating pistons becomes zero at the minimum.

In order to interlock the four rotating pistons in the same rotational direction and at the same rotational speed, the rotating piston shaft has gears and an intermediate gear that meshes with these gears. The intermediate gear has a shaft for output. It is also suitable as a spindle for input.

By providing a housing before and after the four rotating pistons, the variable volume chamber inside the four rotating pistons is sealed.

An opening is provided in the housing to allow fluid to enter and exit the variable volume chamber.

In order to adapt the present invention as an internal combustion engine, the housing is provided with a fuel injection valve, a spark plug or at least one ignition element similar thereto.

In order to prevent the backflow of the fluid, for example, when the present invention is applied as a pump, a valve is provided in the opening or the fluid passage connected thereto.

By making the four rotating pistons twisted while maintaining any of the cross-sectional shapes described above, the rotating angle of the rotating piston changes depending on the region.
A large volume portion and a small volume portion are generated in the variable volume chamber, and these portions can be moved according to the rotation of the rotating piston. This movement can also move the fluid in the variable volume chamber, and can function as a pump.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. In the second and third embodiments, the description of the parts common to the first embodiment will be omitted.

First Embodiment An embodiment in which the present invention is applied to a two-cycle fuel direct injection type internal combustion engine will be described with reference to FIGS. 1, 2 and 3. FIG. In the rotating piston housing 1, four rotating pistons 2 are arranged at equal intervals on the circumference. The gear housing 3, the front housing 4, the rotating piston housing, and the rear housing 5 are provided with a bolt 6 and a nut 7 so as to sandwich the rotating piston.
To stick.

The cross-sectional shape of the rotating piston has a central angle of 90.
Two arcs of ° and smaller than this arc, the central angle is 90 °
Are alternately large and small. The size ratio between the large and small arcs corresponds to the compression ratio of a conventional internal combustion engine. In FIG. 1, the ratio is set to 5: 1. However, the displacement of this ratio is determined according to the position of the scavenging port and the exhaust port, the displacement, the presence or absence of an external supercharger, etc. based on the theoretical analysis and the empirical rules of the internal combustion engine. Since they do not differ from each other as a driving concept, they have no bearing on the novelty of the present invention.

One end of the rotating piston shaft 8 extends through the front housing and into the gear housing, and has a rotating piston shaft gear 9 at the tip. The intermediate gear 10 meshing with the rotating piston shaft gear is fixed to the main shaft 11, and the main shaft extends through the gear housing to the outside. An ignition plug 12 is provided at the center of the front housing, and a fuel injection valve 13 is provided at the center of the rear housing. When the present invention is applied to a diesel engine, a spark plug may not be provided. In the rear housing, two scavenging ports 14 and two exhaust ports 15 are provided. An intake pipe 16 is connected to the scavenging port, and an exhaust pipe 17 is connected to the exhaust port.

During operation of the internal combustion engine, air is fed into an intake pipe by an external blower or the like, fuel is supplied to a fuel injection valve, electricity is supplied to a spark plug, and a muffler is connected to an exhaust pipe. These are known technologies as related devices of a conventional internal combustion engine.

When a mixture of fuel and air is sent from the intake pipe, a fuel injection valve may not be provided.
In this case, it is preferable to provide a valve on the intake pipe to prevent the mixture from blowing out of the intake pipe when it is not necessary. The valve mechanism is well known as a conventional internal combustion engine technology.A cam is provided on a rotating piston shaft, thereby opening and closing a poppet valve or a notched disk is provided on the rotating piston shaft. The disk closes the cross section of the intake pipe, and the notch passes through this cross section to open and close the fluid passage.

As an effect of the first embodiment, the scavenging port and the exhaust port can be arranged at positions apart from each other as compared with the conventional reciprocating piston type two-stroke internal combustion engine. Scavenging is possible. Further, the surface of the rotating piston that comes into contact with the combustion gas is alternated one by one for each process, which is advantageous for cooling and heat resistance of the rotating piston.

As a second embodiment, an example in which the present invention is applied to a pump will be described with reference to FIGS. Rotating piston 1
The cross-sectional shape of 8 consists of two continuous arcs having a central angle of 90 °. The rear housing 19 has openings 20 at the center, upper and lower portions, and the reed valve 2 is provided in these openings.
1 are connected as fluid passages. Although the reed valve may be provided in the opening, in this case,
Preferably, the pipes and openings completely separate the inlet and outlet.

In the pump of the second embodiment, the space outside the four rotary pistons is also used as a variable volume chamber. Naturally, this variable volume chamber is ignored, and the use of only the variable volume chamber inside the four rotating pistons also functions as a pump.

As a third embodiment, an example in which the present invention is applied to a pump that does not require a valve will be described with reference to FIG. Four rotating pistons 24 supported by columns 23 in a housing (not shown) have a rotating piston shaft 25 having gears similar to the gear transmission mechanism of the first embodiment shown in FIG. Work together.

The cross-sectional shape of the rotating piston has a central angle of 90.
The rotating piston has a twisted shape while maintaining this cross-sectional shape.
In FIG. 6, the angle of the twist is set to 90 °. However, the amount of displacement of the angle of the twist is determined according to the use of the pump and the like, and there is no difference in the operation concept. It has nothing to do with gender.

This pump generates a rotational force due to the pressure and flow of the fluid, and also functions as a motor.

The front housing and the rear housing according to the first embodiment in the above description are the fourth and fifth embodiments.
According to the housing of claim 6, the scavenging port and the exhaust port are:
The front housing and the rear housing of the second embodiment correspond to the housings of the tenth and eleventh embodiments, and the reed valve corresponds to the valve of the twelfth embodiment.

The above embodiments are specific examples for explanation, and do not limit the scope of the present invention. These embodiments are only examples of the application of the present invention. As a modification of the embodiments, the scavenging port, the exhaust port, the fuel injection valve, the spark plug, the spark plug, the opening of the second embodiment, and the pipe of the second embodiment are reversed. It is also possible to provide in the housing on the side or a plurality of in both housings.As a modification common to all the embodiments, instead of the intermediate gear, a belt or chain is engaged with the gear of each rotating piston shaft. It can be a transmission mechanism.

The cross-sectional shapes of the rotary pistons of the second and third embodiments are the same as those of the rotary piston of the first embodiment, namely, two arcs each having a central angle of 90 ° and an arc smaller than this circular arc and having a central angle of 90 °. The two also function as a cross-sectional shape formed by alternating large and small.

Many other devices utilizing conventional reciprocating piston machines are capable of replacing the reciprocating piston with the present invention with some modifications.

Such changes and / or improvements can be easily made by those having ordinary skill in the art to which the present invention pertains, and fall within the scope of the present invention substantially defined in the appended claims. It can be considered as a belonging modification.

FIGS. 7 (a), 7 (b), 7 (c), and 7 (d) schematically show the operating state of the internal combustion engine according to the first embodiment according to the rotation of the rotary piston.

In the stage diagram (a), as the rotating piston rotates, the exhaust port and the scavenging port become outside the variable volume chamber, and the air in the variable volume chamber loses its escape space, so that the air is compressed.

In the stage diagram (b), the variable volume chamber approaches a minimum, and near the end of the compression stroke, fuel is injected into the variable volume chamber by the fuel injection valve and ignited by the spark plug.

In the stage diagram (c), the combustion gas expands to a high temperature and a high pressure, and pushes each rotary piston to generate power.

In the step diagram (d), when the exhaust port and the scavenging port enter the variable volume chamber as the rotary piston rotates, air is forced from the scavenging port into the variable volume chamber by a scavenging pump or the like outside the internal combustion engine. It is sent in and exhausts combustion gas from the exhaust port.

[0038]

Since the present invention is configured as described above, it has the following effects.

Since the present invention has a structure having four rotating pistons arranged at equal intervals on the circumference, the inertial forces of the rotating pistons are balanced with each other, and the movement of the rotating pistons is a normal rotating movement. As a result, the generation of vibration and the load on the parts are extremely small.

Since the rotation of the rotating piston is a normal rotating movement, the rotating force can be directly taken out from the rotating piston, or the rotating force from the outside can be directly input to the rotating piston, thereby converting the movement of the rotating piston. There is an effect that a mechanism for performing the operation is unnecessary.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a first embodiment.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a schematic perspective view of a gear transmission mechanism according to the first embodiment.

FIG. 4 is a schematic sectional view of a second embodiment.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a schematic perspective view of a third embodiment, omitting a housing and a gear device.

FIG. 7 is a four-stage diagram corresponding to FIG. 1 and showing four rotational postures for explaining a motion process of the internal combustion engine of the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating piston housing 2, 18, 24 Rotating piston 3 Gear housing 4 Front housing 5, 19 Rear housing 6 Bolt 7 Nut 8, 25 Rotating piston shaft 9 Rotating piston shaft gear 10 Intermediate gear 11 Main shaft 12 Spark plug 13 Fuel injection valve 14 Scavenging port 15 Exhaust port 16 Intake pipe 17 Exhaust pipe 20 Opening 21 Reed valve 22 Pipe 23 Post

Claims (12)

[Claims] 1. A rotary piston having four rotating pistons arranged at equal intervals on a circumference, and having a cross-sectional shape of two circular arcs having a central angle of 90 ° and a central angle smaller than the circular arc and having a central angle of 90 °. A rotary piston machine consisting of two circular arcs that alternate in size. 2. The rotary piston machine according to claim 1, wherein the rotary piston shafts of said four rotary pistons have gears and an intermediate gear that meshes with these gears. 3. The rotary piston machine according to claim 2, wherein the rotary piston maintains its cross-sectional shape.
A rotating piston machine with a twisted shape. 4. The rotary piston machine according to claim 2, wherein a housing is provided before and after the four rotary pistons. 5. The rotary piston machine according to claim 4, wherein said housing has an opening. 6. The rotary piston machine according to claim 5, wherein the housing has a fuel injection valve, a spark plug or at least one ignition element similar thereto in the housing. 7. A rotary piston machine having four rotary pistons arranged at equal intervals on a circumference, and having a cross-sectional shape of two rotary arcs each having a central angle of 90 ° connected to each other. 8. The rotary piston machine according to claim 7, wherein the rotary piston shafts of the four rotary pistons have gears and an intermediate gear that meshes with these gears. 9. The rotary piston machine according to claim 8, wherein the rotary piston maintains its cross-sectional shape.
A rotating piston machine with a twisted shape. 10. The rotary piston machine according to claim 8, wherein a housing is provided before and after the four rotary pistons. 11. The rotary piston machine according to claim 10, wherein the housing has an opening. 12. The rotary piston machine according to claim 11, further comprising a valve in the opening or a fluid passage connected thereto.