JP2921527B2 - Rotary internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary internal combustion engine that obtains power by directly rotating a rotor by the expansion force of combustion gas without using a crank mechanism.

[0002]

2. Description of the Related Art As a conventional rotary internal combustion engine, a combustion chamber in which a mixture of air and fuel burns, a vane rotary air compressor for supplying high-pressure air to the combustion chamber, and a high-temperature, high-pressure high-pressure air supplied from the combustion chamber An expansion chamber for expanding combustion gas of
A rotor accommodated eccentrically in the expansion chamber,
Vane grooves are provided at predetermined intervals on the outer periphery of this rotor, and thin plate-like vanes are inserted into each vane groove so as to be freely protruded and retracted, and the rotation axis of the expansion chamber side rotor and the rotation axis of the compressor side rotor are made common. There is something (Japanese Patent Publication No. 28-2402)
No.).

[0003] The air compressed by the vane rotary type air compressor and the fuel supplied from the fuel tank are sent to a combustion chamber, where they are burned to generate high-temperature and high-pressure combustion gas. The combustion gases in the combustion chamber are supplied into the expansion chamber and are trapped between the vanes. As the combustion gas sequentially expands, a rotational force is applied to the rotor. The combustion gas is discharged to the outside when the expansion stroke is completed, and thus the rotation continues.

[0004]

However, in the case of this rotary internal combustion engine, the vane rotary type air compressor, the combustion chamber and the expansion chamber are arranged along the axis of rotation of the rotor, and the axial dimension of the internal combustion engine is large. Because the vane rotary air compressor and the expansion chamber are arranged far apart, the vane rotary air compressor merely compresses the sucked outside air and supplies it directly to the combustion chamber. ,
There is a problem that high thermal efficiency cannot be obtained.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to reduce the size of a rotary internal combustion engine and to improve thermal efficiency.

[0006]

In order to solve the above-mentioned problems, the present invention comprises a combustion chamber for burning air and fuel, and an expansion chamber for expanding combustion gas supplied from the combustion chamber. The rotor is rotatably accommodated in the chamber, arc-shaped vane grooves are provided at predetermined intervals on the outer periphery of the rotor, and one end of the vane is slidably fitted to each of the vane grooves, and the rotor is moved from the combustion chamber. In a rotary internal combustion engine that rotates the rotor by confining the supplied combustion gas between the vanes and expanding the recess, recesses are respectively formed on both side surfaces of the rotor, and holes are provided in the rotor to allow communication between the recesses. An introduction hole for introducing air into one of the concave portions, and a discharge hole for discharging air from the other of the concave portions are provided in a housing forming the expansion chamber, and air is introduced into the combustion chamber. Connecting the air supply pipe to the discharge hole.

The combustion chamber includes a combustion chamber for burning air and fuel, an air compressor for supplying high-pressure air to the combustion chamber, and an expansion chamber for expanding combustion gas supplied from the combustion chamber. The rotor is rotatably accommodated, arc-shaped vane grooves are provided at predetermined intervals on the outer periphery of the rotor, and one end of a vane is slidably fitted in each of the vane grooves and fed from the combustion chamber. In a rotary internal combustion engine that rotates the rotor by confining the expanded combustion gas between the vanes and expanding the expanded combustion gas, the expansion chamber and the compression chamber of the air compressor are arranged adjacent to each other in the direction of the rotor rotation axis via a partition wall. A hole for arranging the combustion chamber and the expansion chamber or the air compressor side by side in a direction perpendicular to a rotor rotation axis, and forming recesses on both side surfaces of the rotor to allow communication between the recesses; A housing provided in the rotor, an introduction hole for introducing high-pressure air from the air compressor into one of the recesses in the partition, and a discharge hole for discharging air in the other of the recesses, the housing forming the expansion chamber; And an air supply pipe for guiding air to the combustion chamber was connected to the discharge hole.

[0008]

Further, an injection nozzle is provided in the combustion chamber,
High-pressure air from the air compressor is supplied to the combustion chamber via the injection nozzle, the injection nozzle and the expansion chamber are connected by a bypass pipe, and excess air of the injection nozzle not supplied to the combustion chamber is removed. The gas may be supplied between the vanes in the expansion stroke through the bypass pipe.

[0010]

Since the air is sent into the combustion chamber via the recess of the rotor on the expansion chamber side, heat of the expansion chamber is taken away before the air is sent into the combustion chamber, and high-temperature air is sent into the combustion chamber. . In addition, since the expansion chamber and the compression chamber of the air compressor are arranged adjacent to each other along the rotor rotation axis direction via the partition wall, heat is transmitted from the expansion chamber to the air compressor side, and the air in the compression chamber warms. Since the high-pressure air discharged from the air compressor is sent into the combustion chamber via the recessed portion of the rotor on the expansion chamber side, heat of the expansion chamber is taken until the high-pressure air is sent into the combustion chamber, and Of high-pressure air is sent into the combustion chamber.

[0011] Of the high-pressure air supplied from the compression chamber to the injection nozzle, an excess is supplied between the vanes in the expansion stroke via a bypass pipe.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a rotary internal combustion engine according to one embodiment of the present invention. In FIG.
4 is a front side block constituting the housing 1,
A center block, a rear side block, 5 a combustion chamber for burning a mixed gas of air and fuel, 6 an expansion chamber for expanding a high-temperature and high-pressure combustion gas, 7 a compression chamber for compressing sucked outside air, and 8 a recoil starter ( 9 is a two-fluid nozzle (injection nozzle), 10 is a fuel tank, 11 is a rotor rotation shaft, 12 is an initial spark plug (ignition device), 1
Reference numerals 3 and 14 are rotors, and 15a to 15e and 16a to 16c are vanes.

The rotor 14 has the rotor 1 inside the compression chamber 7.
Numerals 3 are eccentrically accommodated in the expansion chamber 6, respectively.
Each of the rotors 13 and 14 is fixed to a rotor rotation shaft 11 penetrating the housing 1 and has a common shaft.

As shown in FIG. 2, arc-shaped vane grooves 14a to 14c are formed at predetermined intervals on the outer periphery of the rotor 14 which constitutes a part of the air compressor. Vane groove 1
Rear ends of the vanes 16a to 16c are rotatably fitted to 4a to 14c.

On both sides of the rotor 14, recesses 17a, 17
b are provided, and the concave portions 17a and 17b are provided with holes 18a to 18c.
Is communicated through. Also, the rotor 1 has
7a and the communication groove 1 for connecting the vane grooves 14a to 14c with each other
9a to 19c are provided, the concave portion 17b and the vane groove 14a are provided.
To 14c are provided respectively.

As shown in FIG. 4, the vanes 16a to 16c are entirely curved, the leading end is formed to be thin, and the rear end is formed to have an arc-shaped bulge.
The rear ends fitted into 6a to 16c rotate with the rotation of rotor 14 while rubbing the arc surfaces in vane grooves 16a to 16c. Recesses 21a to 21c and 22a to 22c are provided on both side surfaces of the vanes 16a to 16c (FIG. 5). The rear ends of the vanes 16a to 16c have concave portions 21a to 21c, 22a to 22c and vane grooves 1a.
Communication grooves 23a ₁ , 23a ₂ ,
_{23b 1, 23b 2, 23c 1} , 23c 2, 24a 1, 24
_{a 2, 24b 1, 24b 2} , 24c 1, 24c 2 are provided.

The rotor 13 and the vane 15a on the expansion chamber 6 side
As shown in FIGS. 1, 3, 6 and 7,
The shapes of the rotor 14 and the vanes 16a to 16c on the air compressor side are substantially the same. As shown in FIG. 3, arc-shaped vane grooves 25a to 25a are formed on the outer periphery of the rotor 13 at predetermined intervals.
25e are formed. Rear ends of the vanes 15a to 15e are rotatably fitted in the vane grooves 25a to 25e. Recesses 26a and 26b are provided on both side surfaces of the rotor 13, and the recesses 26a and 26b communicate with each other through holes 27a to 27e. The rotor 13 has communication grooves 28a to 28e for communicating the recesses 26b and the vane grooves 25a to 25e.
28e are provided, and the concave portion 26a and the vane grooves 25a to 25e are provided.
e are provided with communication grooves 29a to 29e for communicating with e. The rear ends of the vanes 15a to 15e rotate with the rotation of the rotor 13 while rubbing the arc surfaces of the vane grooves 25a to 25e. Recesses 43a to 43e and 44a to 44e are provided on both side surfaces of the vanes 15a to 15e. The rear ends of the vanes 15a to 15e have concave portions 43a to 43e, 44a to 44e and vane grooves 15a to 1e.
Communication grooves 45a to 45e, 46a to 4 for communicating with 5e.
6e is provided.

The above-mentioned rotors 13, 14 and vanes 15
Examples of the materials a to 15e and 16a to 16c include a glass impregnated carbon material.

The combustion chamber 5 and the expansion chamber 6 are formed by the front side block 2 and the center block 3, and the combustion chamber 5 is located above the expansion chamber 6 (FIG. 1). The inner wall of the combustion chamber 5 is formed of a refractory ceramic 32. An initial ignition plug (or glow plug) 12 as an ignition device is inserted into the hole 33 of the front side block 2.
Its tip projects into the combustion chamber 5. A discharge hole 34 is provided in the boss portion of the front side block 2, and an inlet of an air supply pipe 35 is connected to one end opening of the hole 34. The other end opening of the discharge hole 34 faces the rotor 13 and the recess 26 b of the rotor 13. The outlet of the air supply pipe 35 is connected to a two-fluid nozzle (spray nozzle) 9.

A hole 27 communicating with the combustion chamber 5 is provided in the upper part of the center block 3, and the injection port of the two-fluid nozzle 9 is inserted into the hole 27. The two-fluid nozzle 9 is connected to a fuel tank 10 via a fuel supply pipe 36. The injection port of the two-fluid nozzle 9 faces the initial ignition plug 12, and air and fuel supplied through the air supply pipe 35 and the fuel supply pipe 36 are injected toward the initial ignition plug 12.
A throttle lever 29 is attached to the two-fluid nozzle 9 so that the injection amount can be adjusted. Further, the injection amount can be adjusted by increasing or decreasing the air supply amount.

A bypass pipe 37 is connected to the two-fluid nozzle 9 (FIG. 2). The end of the bypass pipe 37 is connected to a hole 38 of the center block 3 as shown in FIG. Of the high-pressure air, the surplus portion passes through the bypass pipe 37, from the suction to the vanes 15a to 15b during the expansion stroke.
It is sent between 15e.

An introduction hole 39 is provided in the lower part of the center block 3 which constitutes a partition separating the expansion chamber 6 and the compression chamber 7, and one end opening of the hole 39 is formed in the recess 17b of the rotor 14 and the other end. The end openings always face the concave portions 26a of the rotor 13, respectively.

Further, the center block 3 is provided with a discharge port 40 communicating with the expansion chamber 6, and the combustion gas in the expansion chamber 6 is discharged from the discharge port 40 to the outside. An exhaust guide groove 41 communicating with the outlet 40 is formed on the inner wall of the expansion chamber 6, and the groove 41 becomes deeper as approaching the outlet 40. Furthermore, the center block 3 has a suction port 42 communicating with the compression chamber 6.
Is provided to suck outside air into the compression chamber 6 from the suction port 42.

The compression chamber 7 is formed by a center block 3 and a rear side block 4, and a recoil starter 8 as a starting device is mounted adjacent to the rear side block 4. As shown in FIG. 1, the recoil starter 8 includes a starting pulley 31 fixed to one end of the rotor rotation shaft 11 and a case 3 fixed to the rear side block 4.
2, a starter body 33 fixed to the case 32, and an initial ignition piezoelectric element (piezoelectric element) 50 also fixed to the case 32. When a rope (not shown) of the starter body 33 is pulled, a pawl (not shown) protrudes, the pawl is hooked on a hole (not shown) of the pulley 31 for starting, the pulley 31 for starting rotates, and the rotating shaft 11 rotates. The rope is rewound by the force of a spring (not shown), and the claws are also retracted. When the rope is pulled, the nail strikes the initial ignition piezoelectric element 50, and the voltage generated at this time is taken out, applied to the initial ignition plug 12, and ignited.

Next, the operation of the above-described rotary internal combustion engine will be described.

When the recoil starter 8 is operated, the rotor rotation shaft 11 rotates, and a voltage is generated in the initial ignition piezoelectric element 50 with the rotation, and this voltage is applied to the initial ignition plug 12.
And is ignited.

When the rotor shaft 11 rotates, the rotor 1
When the rotor 14 on the side of the air compressor rotates at the same time, the outside air is drawn into the compression chamber 7 from the suction port 42 as shown in FIGS. 8A and 8B. FIG.
As shown in (c), it is trapped between the vanes 16a and 16b, and compression starts. As shown in FIG. 8D, when the compression proceeds and the vane 16b comes into close contact with the outer periphery of the rotor 14, the vane 16b passes through the communication grooves 23b ₂ and 24b _2.
And the compressed space between the vanes 16a and 16b communicates with each other, and the high-pressure air between the vanes 16a and 16b starts to enter the concave portions 21b and 22b of the vane 16b. From FIG. 8D through FIG. 9A and FIG. 9B, FIG.
, The close contact state of the vane 16b with the outer periphery of the rotor 14 is maintained.
22b and the compression space between the vanes 16a, 16b continue to communicate with each other, while the vane 16a approaches the outer periphery of the rotor 14 with the rotation of the rotor 14, and at the time shown in FIG. Air flows into the recess 21b of the vane 16b,
22b. The vane 16b moves from FIG. 9 (d) to FIG. 10 (b) while keeping the high-pressure air confined, and at the time of FIGS.
b, the communication grooves 23b ₁ and 24b ₁ and the rotor 14
9b and 20b coincide with each other, and the recesses 21b,
The high-pressure air trapped in 22b escapes into the recesses 17a and 17b of the rotor 14. At this time, the communication groove 23
b _2, 24b ₂ is closed by the inner wall of the vane groove 14b, the communication grooves 23b _2, 24b ₂ high pressure air will not escape into the expansion chamber 6 side through. Each vane 1 as described above
Each of 6a to 16c exhibits a function as a rotary valve.

The high-pressure air trapped in the recesses 17 a and 17 b of the rotor 14 is supplied to the introduction hole 39 of the center block 3.
Is discharged to the concave portion 26a of the rotor 13 on the prime mover side. The high-pressure air in the concave portion 17a of the rotor 14
It is sent from 18c to the introduction hole 39 via the inside of the concave portion 17b.

A part of the air that has entered the concave portion 26a of the rotor 13 enters the concave portions 44a to 44e of the vanes 15a to 15e through the communication grooves 29a to 29e and 46a to 46e to take heat, and also to the concave portion 26a of the rotor 13 Return. The air in the concave portion 26a of the rotor 13 enters the concave portion 26b through the holes 27a to 27e, and a part of the air is communicated with the communication grooves 28a to 28e.
8e, 45a to 45e, the recesses 43a to 43e of the vanes 15a to 15e enter the recesses 26b of the rotor 13 after removing heat, and are sent from the discharge holes 34 of the front side block 2 to the air supply pipe 35 to supply air. It is sent to the two-fluid nozzle 9 through the pipe 35.

On the other hand, fuel is fed from the fuel tank 10 to the two-fluid nozzle 9 through the fuel supply pipe 36, and air and fuel are injected from the tip of the two-fluid nozzle 9 toward the initial spark plug 12. When the air-fuel mixture is burned by 12, combustion gas is generated in the combustion chamber 5. As shown in FIG. 11A, the high-temperature and high-pressure combustion gas is sucked by the rotation of the rotor 13, and as shown in FIGS. 11B and 11C, the combustion trapped between the vanes 15e and 15d after the suction. The gas expands, and the expansion action causes the rotor 1 to expand.
3 is given a rotational force. When the expansion stroke is completed, FIG.
As shown in (d), when the leading end of the preceding vane 15d passes the starting end 41a of the exhaust guide groove 41, the combustion gas gradually starts to escape to the exhaust port 40 side, and the state shown in FIGS. 12 (a) and 12 (b). , The discharge stroke ends at the time of FIG.
The combustion gas is discharged from the outlet 40 to the outside.

After the start of combustion, continuous combustion is performed while fuel and air are being supplied.
2 and the recoil starter 8 stop operating.

An excess portion of the high-pressure air supplied to the two-fluid nozzle 9 via the air supply pipe 35 is supplied via a bypass pipe 37 to a vane (15 in FIG.
e, 15d) to further accelerate the rotation of the rotor 13.

According to the rotary internal combustion engine of this embodiment, the expansion chamber 6 and the compression chamber 7 are arranged adjacent to each other with the center block 3 interposed therebetween, and the high-pressure air discharged from the compression chamber 7 of the air compressor is expanded. Recesses 26a, 26 of rotor 13 on chamber 6 side
b and recesses 43a to 43e, 4 of vanes 15a to 15e
4a to 44e, the heat is sent into the combustion chamber 5 so that the heat transmitted from the expansion chamber 6 causes the compression chamber 7
The internal air is warmed, and the high-pressure air discharged from the compression chamber 7 removes the heat of the expansion chamber 6 before being sent to the air supply pipe 36, and the higher-temperature high-pressure air is passed through the two-fluid nozzle 9 to the compression chamber 5. And the thermal efficiency is further improved.

Further, since an excess portion of the high-pressure air supplied from the compression chamber 7 to the two-fluid nozzle 9 is supplied between the vanes in the expansion stroke through the bypass pipe 35 and the discharge hole 34, the excess air is supplied to the rotor. Thirteen rotation energy can be used, and the energy of the compressor can be used to the maximum.

Immediately after the recoil starter 8 is actuated and the rotor shaft 11 starts to rotate, combustion has not yet started, and the vanes 15a to 15e have fallen to the outer peripheral side of the rotor 13, so that the recoil starter 8 8 does not have to work for the expansion chamber 6. Therefore, there is an advantage that a large recoil starter is not required.

Further, the recesses 26a and 26b of the rotor 13 and the recesses 43a to 43e and 44a of the vanes 15a to 15e.
Since high-pressure air is fed into the expansion chamber 6, both side surfaces of the rotor 13 and the vanes 15 a to 15 e slightly float with respect to the inner wall of the expansion chamber 6. As a result, the frictional resistance is reduced, and the rotation of the rotor 13 becomes smooth.

In the above embodiment, the case where a rotary compressor is used as the air compressor has been described.
Alternatively, even if a scroll compressor is used, the same effect as in the above embodiment can be obtained.

[0039]

As described above, according to the rotary internal combustion engine of the present invention, air is sent into the combustion chamber via the recess of the rotor on the expansion chamber side. Then, the heat of the expansion chamber is taken away, the high-temperature air is sent into the combustion chamber, and the pulsation of the sent high-pressure air is smoothed. Therefore, thermal efficiency can be improved.

Further, since the expansion chamber and the compression chamber of the air compressor are disposed adjacent to each other along the rotor rotation axis via the partition wall, heat is transmitted from the expansion chamber to the air compressor side, and the air in the compression chamber is compressed. Is warmed, and the high-pressure air discharged from the air compressor is sent into the combustion chamber through the recess of the rotor on the expansion chamber side, so that the heat of the expansion chamber is taken until the high-pressure air is sent into the combustion chamber. In addition, higher-temperature high-pressure air is sent into the combustion chamber, and the pulsation of the sent high-pressure air is smoothed. Therefore, the thermal efficiency can be further improved.

Further, of the high-pressure air supplied from the compression chamber to the injection nozzle, an excess is supplied between the vanes in the expansion stroke via a bypass pipe. Therefore, the excess air can be used as rotational energy of the expansion chamber-side rotor, so that the overall energy efficiency can be improved and continuous combustion can be stabilized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a rotary internal combustion engine according to one embodiment of the present invention.

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

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a plan view showing a vane on the compressor side.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a plan view showing a vane on a motor unit side.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a sectional view for explaining the operation of the compressor section.

FIG. 9 is a sectional view for explaining the operation of the compressor section.

FIG. 10 is a sectional view for explaining the operation of the compressor section.

FIG. 11 is a cross-sectional view for explaining the operation of the motor unit.

FIG. 12 is a sectional view for explaining the operation of the prime mover unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Front side block 3 Center block 4 Rear side block 5 Combustion chamber 6 Expansion chamber 7 Compression chamber 8 Recoil starter (starting device) 9 Two-fluid nozzle (injection nozzle) 11 Rotor shaft 12 Initial ignition plug (ignition device) 13, Reference Signs List 14 rotor 15a to 15e, 16a to 16c vane 25a to 25e vane groove 26a, 26b recess 34 discharge hole 50 initial ignition piezoelectric element (piezoelectric element) 35 air supply pipe 37 bypass pipe

Claims (7)

(57) [Claims] 1. A combustion chamber for burning air and fuel, this
An expansion chamber for expanding the combustion gas supplied from the combustion chamber, a rotor is rotatably accommodated in the expansion chamber, and arc-shaped vane grooves are provided at predetermined intervals on the outer periphery of the rotor. In a rotary internal combustion engine in which one end of a vane is slidably fitted in a vane groove, and the combustion gas sent from the combustion chamber is confined between the vanes and expanded to rotate the rotor,
Concave portions are formed on both side surfaces to allow communication between the concave portions.
Holes are provided in the rotor, and air is introduced into one of the recesses.
And a discharge port for discharging air in the other recess.
A hole in the housing forming the expansion chamber;
A rotary internal combustion engine , wherein an air supply pipe for guiding air to a combustion chamber is connected to the exhaust hole . 2. An expansion chamber comprising: a combustion chamber for burning air and fuel; an air compressor for supplying high-pressure air to the combustion chamber; and an expansion chamber for expanding combustion gas supplied from the combustion chamber. The rotor is rotatably housed, and arc-shaped vane grooves are provided at predetermined intervals on the outer periphery of the rotor,
Fitted each one end of the vanes to their respective vane grooves of the slidably, in a rotary internal combustion engine for rotating the rotor by expanding the combustion gas fed from said combustion chamber confined between the vanes, the Expansion chamber and said
The compression chamber of the air compressor and the rotor axis
And the combustion chamber and the expansion chamber or the air pressure
The compressor and the compressor are arranged side by side in the direction perpendicular to the rotor rotation axis, recesses are formed on both side surfaces of the rotor, and holes for communicating between the recesses are provided in the rotor .
The introduction hole for introducing the high-pressure air into one of the concave portions is
A discharge hole provided in the partition wall for discharging air in the other concave portion
And provided on the housing for forming the expansion chamber, rotating the internal combustion engine air supply pipe for guiding air to the combustion chamber, characterized in that connected to the discharge hole. 3. The air compressor is a scroll type compressor.
3. The rotary internal combustion engine according to claim 2, wherein: 4. An injection nozzle is provided in said combustion chamber,
High pressure air from the air compressor is forwarded through the injection nozzle
Supply into the combustion chamber, the injection nozzle and the expansion chamber
Connected by a bypass pipe and not supplied to the combustion chamber
Excess air from the injection nozzle is expanded through the bypass pipe
It is characterized in that it is supplied between the vanes in the process.
The rotary internal combustion engine according to claim 2 or 3, wherein: 5. An ignition device is provided in the combustion chamber, and the ignition device is started.
Activating the ignition device in conjunction with the starting operation of the device,
It is characterized by igniting the mixed gas in the combustion chamber
The rotary internal combustion engine according to any one of claims 1 to 4,
Seki. 6. The starting device according to claim 1, wherein said starting device is driven by an impact.
Comprising a piezoelectric element,
The voltage generated in the piezoelectric element is supplied to the ignition device for ignition.
6. The rotary internal combustion engine according to claim 5, wherein
organ. 7. The glow plug according to claim 7, wherein the ignition device is a glow plug.
7. The rotary internal combustion engine according to claim 5, wherein: