JPH0217155Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Application field of invention] The present invention relates to a rotating piston engine.

[Background Art] Various configurations of rotary piston engines have been proposed in the past, but the Wankel revolution piston engine is the only one that has been commercialized and mass-produced.

However, the basic principle of the Bangel revolution piston engine is motion based on an epitrochoid curve, so it is not a pure circular motion.
Perform eccentric/planetary motion.

Therefore, compared to pure circular motion, the engine efficiency is inferior, and due to eccentric motion, vibrations cannot be avoided, which is a fundamental weakness, and it is difficult to say that it is the best rotary piston engine.

[Purpose of the invention] Taking the above facts into consideration, the present invention aims to provide a rotary piston engine with pure circular motion that enables better engine efficiency and reduced vibration generation.

[Structure of the invention] The rotary piston engine according to the invention includes: an annular cylinder forming a hollow annular piston swirling path on the inner surface; a plurality of combustion chamber bodies that form an upper combustion chamber on the inner surface thereof; a rotating body having a rotation center at the center of a circle of the annular cylinder; and a rotary body that is slidably disposed in a piston swirl path of the annular cylinder; the same number of pistons as the combustion chamber bodies and engaged with the rotating body so as to simultaneously face each of the combustion chamber bodies; an upper combustion chamber of each of the combustion chamber bodies and a piston swirl path of the annular cylinder; an upper combustion chamber gate valve provided between; an intermediate gate valve provided in the piston swirl path at an intermediate portion between each of the combustion chamber bodies; and an opposite piston rotation direction side near each combustion chamber body gate valve; a combustion chamber gate valve provided in the piston swirl path; an opening provided in the piston swirl path on the side opposite to the piston rotation direction near each of the combustion chamber gate valves; and a combustion chamber gate valve provided in the combustion chamber body near each opening. a communication pipe in which the openings are provided with valves to communicate with each other; a breather valve attached to an opening provided in the piston swirl path on the side opposite to the piston rotation direction in the vicinity of each of the combustion chamber gate valves; a breathing valve attached to an opening provided in the piston swirling path on the side in the piston rotational direction; a suction valve attached to an opening provided in the piston swirling path on the piston rotational direction side near each of the combustion chamber gate valves; and an exhaust valve attached to an opening provided in the piston swirl path on the side opposite to the piston rotation direction near each of the intermediate gate valves, thereby enabling the piston to perform pure circular motion.

[Embodiment of the invention] Figs. 1 and 2 show a first embodiment of a rotary piston engine according to the invention, and Fig. 3 shows its operating stroke. In this embodiment, the annular cylinder 10 has a hollow annular piston swirl circuit 12 with a circular cross section formed on its inner surface. Further, the annular cylinder 10 has fixed combustion chamber bodies 16A, 16B and 16C that cover each of the three openings provided at equal intervals in the annular cylinder and form upper combustion chambers 14A, 14B and 14C on the inner surface. It is set up. The respective combustion chamber bodies 16A, 16B and 1
6C has spark plugs 18A, 18B and 1, respectively.
8C is installed. The piston swirl path 12 of the annular cylinder 10 includes each combustion chamber body 16.
The driving piston 20A and the driven piston 2 are arranged so as to simultaneously face each other.
0B and 20C are slidably disposed with a seal ring interposed therebetween. Each piston 20A, 20
Both B and 20C are cut obliquely in the direction of travel, so that they can smoothly pass through the valve groove. In addition, the main driving piston 20A and the driven pistons 20B and 20C are all rotary bodies 22, which will be described later.
It is fixed on the outer periphery of the The rotating body 22
is formed into a disk shape, and as shown in FIG. 2, a gas seal member 26 is provided on both sides of its outer circumference via a spring member (not shown). The annular cylinder 10 is rotatably engaged with an annular passage 24 opened at the inner diameter portion thereof.
An output shaft 30 is attached to the boss 28 at the center of the rotating body 22.
is inserted and fixed. Further, a mounting member 32 is fixed to both sides near the outer circumference of the rotary body 22, and a pressing member 34 is mounted to the mounting member via a spring member (not shown), and is in pressing contact with the annular cylinder 10. are doing.

The upper combustion chamber gate valves 36A, 36B and 36C are connected to the upper combustion chambers 14A, 14B and 1, respectively.
It is provided at the lower part of 4C, that is, directly above the opening of the annular cylinder 10. Next, the operating devices of these upper combustion chamber gate valves 36A, 36B and 36C will be explained.

In addition, these upper combustion chamber gate valves 36A, 36
B and 36C have the same configuration, so the operating device of the upper combustion chamber gate valve 36A shown in FIG. 1B will be explained.

As shown in FIG. 1B, the cross-sectional shape of the upper combustion chamber gate valve 36A in the direction perpendicular to the axis of the piston swirl path 12 is an arcuate shape that partitions the upper combustion chamber 14A and the piston swirl path 12. The upper combustion chamber gate valve 36A is rotatable around the axis O of the piston swirl path 12 along the outer periphery of the piston swirl path 12. Further, the upper combustion chamber gate valve 36A is connected to a lever 13 disposed outside the annular cylinder 10 in a direction perpendicular to the output shaft 30, and when this lever 13 moves in the axial direction, the upper combustion chamber gate valve 36A The combustion chamber gate valve 36A is
It is adapted to rotate about the axis O of the piston swirl circuit 12 as the rotation center.

One end 15 of a compression coil spring 15 is attached to the opposite end 13A of the output shaft 30 of the lever 13.
A is fixed, and the compression coil spring 15
The other end 15B is fixed to a bracket 17 fixed to the side surface of the combustion chamber body 16A. In addition, the other end 13B of the lever 13 is biased toward the output shaft 30 by the biasing force of the compression coil spring 15.
It is in contact with the outer circumferential surface 19A as a cam surface of a cam 19 coaxially fixed to the cam 19, and as the cam 19 rotates, it moves in the direction of the counter-output shaft 30 against the biasing force of the compression coil spring 15. It's becoming like that.

Therefore, the upper combustion chamber gate valve 36A opens and closes in synchronization with the rotation of the output shaft 30. Intermediate gate valves 38A, 38B, and 38C are provided in the piston swirl path 12 at an intermediate portion between each of the combustion chamber bodies 16A, 16B, and 16C.
The combustion chamber gate valves 40A, 40B, and 40C are respectively provided in the piston swirl path 12 on the side opposite to the piston rotation direction, immediately adjacent to each of the combustion chamber bodies 16A, 16B, and 16C.

Next, these intermediate gate valves 38A, 38B, 3
8C and the operating devices of the combustion chamber gate valves 40A, 40B, and 40C will be explained.

The operating devices of the intermediate gate valves 38A, 38B, 38C and the combustion chamber gate valves 40A, 40B, 40C have the same configuration, so the operating device of the intermediate gate valve 38B shown in FIG. explain.

As shown in FIG. 1B, this intermediate gate valve 38
B is composed of a rectangular plate, and the output shaft 30
The piston swirl circuit 12 is moved parallel to the piston rotation circuit 12. An end portion 39A of a lever 39 on the side opposite to the output shaft 30 is pivotally supported on the end portion of the intermediate gate valve 38B on the side opposite to the piston swirl circuit 12. It is rotatably supported clockwise and counterclockwise in FIG. 1B by a bracket 41 fixed to the right side surface 10A in FIG.

The other end 39B of the lever 39 is connected to a drum-shaped cam 43 coaxially fixed to the output shaft 30.
A cam groove 45 continuously formed along the outer peripheral surface of
is inserted into. The cam groove 45 is meandering, and the other end 39B of the lever 39 is adapted to move along the cam groove 45 in the left-right direction in FIG. 1B.

Therefore, the intermediate gate valve 38B is opened and closed in synchronization with the rotation of the output shaft 30.

The communication pipes 42A, 42B and 42C are connected to an opening provided in the piston swirling path 12 on the side opposite to the piston swirling direction immediately adjacent to each combustion chamber gate valve 40A, 40B and 40C, and to each combustion chamber body 16 near each opening.
It communicates with the openings provided in A, 16B and 16C. Each opening has a communication pipe inlet valve 60A,
60B, 60C and communication pipe outlet valves 62A, 62
B, 62C are installed.

The breather valves 44A, 44B, and 44C are attached to openings provided in the piston swirling path on the side opposite to the piston swirling direction, immediately adjacent to the respective combustion chamber gate valves 40A, 40B, and 40C. Breathing valve 46A, 4
6B and 46C are the respective intermediate gate valves 38A, 3
It is attached to the opening provided in the piston rotation path on the piston rotation direction side closest to 8B and 38C.

The suction valves 48A, 48B, and 48C are attached to openings provided in the piston swirling path on the piston swirling direction side immediately adjacent to the combustion gate valves 40A, 40B, and 40C. Exhaust valves 50A, 50B and 5
0C is each intermediate gate valve 38A, 38B and 38
C It is attached to the opening provided in the piston rotation path on the opposite side of the piston rotation direction.

Further, the output shaft 30 has a disc-shaped disk 47.
are fixed coaxially, and grooves (not shown) are formed in the disk 47 at predetermined intervals along six circles centered on the rotation axis.
Six optical sensors 49 are disposed at positions corresponding to the rotation locus of the groove, respectively, and these optical sensors 49 detect the groove of the disk 47. The optical sensor 49 is connected to a control circuit composed of a microcomputer, etc.
This control circuit includes breather valves 44A, 44B, 4
4C, intake valves 46A, 46B, 46C, intake valves 48A, 48B, 48C, exhaust valves 50A, 50
B, 50C, communication pipe inlet valve 60A, 60B, 60
C and communicating pipe outlet valves 62A, 62B, and 62C are connected, respectively.

Therefore, the control circuit operates based on the output signal of the optical sensor 49, the breather valves 44A, 44B, 44C, the breather valves 46A, 46B, 46C, the suction valves 48A,
48B, 48C, exhaust valve 50A, 50B, 50C
The opening and closing of the communicating pipe inlet valves 60A, 60B, 60C and the communicating pipe outlet valves 62A, 62B, 62C are controlled, respectively.

Next, the operation of this embodiment will be explained with reference to FIG.

FIG. 3A shows a state in which the driving piston 20A, which is rotating clockwise, is located below the combustion chamber body 16A. In this state, the suction valve 48A, the communication pipe inlet valve 60A, and the communication pipe outlet valve 62A are closed, and the breather valve 44A is opened, according to the output signal of the control circuit. Therefore,
Piston swirl path 12 closed by main piston 20A, combustion chamber body 16A, and combustion gate valve 40A
A combustion chamber is formed by the upper combustion chamber 14A, and the compressed air-fuel mixture in the combustion chamber is ignited by the ignition plug 18A and starts to explode and expand.

In FIG. 3B, the main piston 20A expands due to the ignition, and due to the gas pressure, the driving piston 20A rotates to the position shown in the figure. In this state, the output signal of the control circuit causes the intake valve 46A, the exhaust valve 50A, and the communication pipe inlet valve 60 to
B is closed, and the communicating pipe inlet valve 60A, the communicating pipe outlet valve 62A, and the breather valve 44B are open. Also, in this state, the intake valve 48B is opened by the output signal of the control circuit, and the combustion gate valve 40B is opened.
B, upper combustion chamber gate valve 36B and driving piston 2
The intake of the air-fuel mixture has begun into the intake working chamber formed by the piston swirl circuit 12 closed by 0B.

In Fig. 3C, the intermediate gate valve 38A is closed, and the breathing valve 4
6A and the exhaust valve 50A are opened, and the communication pipe 42A is opened.
This shows a state in which the driven piston 20C is compressed through the piston 20C and exhaustion has begun. Further, in this state, the suction of the air-fuel mixture is about to end.

FIG. 3D shows a state in which the evacuation is about to end, and the suction of the air-fuel mixture has ended, and the communication pipe 42
This shows a state in which compression into the upper combustion chamber 14C has begun through C.

FIG. 3E shows the state immediately before the compression ends, and FIG. 3F shows the state after completion.

FIG. 3G shows a combustion chamber formed by a closed piston swirl path 12 and an upper combustion chamber 14C, in which compressed air-fuel mixture is ignited by a spark plug 18C, and the combustion chamber shown in FIG. 3A is shown in FIG. It is in the same state as chamber 14A.

As described above, in this embodiment, by providing three combustion chamber bodies in the annular cylinder, it is possible to perform two jobs per revolution of the output shaft. In addition, since a member that presses the annular cylinder is attached to the rotating body, the annular passage of the rotating body that opens at the inner diameter of the annular cylinder is prevented from widening due to gas expansion, thereby improving gas sealing. be able to. Furthermore, since the driving piston is shaped to cover the annular passage opening of the rotating body when the air-fuel mixture is ignited, gas sealing can be improved.

Although the above embodiment shows an example of three combustion chamber bodies, the number of combustion chamber bodies is not limited to this, and the present invention can be applied as long as the number is an odd number of 3 or more or an integral multiple of 3. It is possible to implement In this case, 2
Simultaneous combustion in the above combustion chambers is possible, and the number of work per revolution of the output shaft can be increased, so that an increase in total displacement, smooth output generation, and low vibration can be achieved.

Further, in the above embodiments, the rotating body has a disc-like shape, but the rotating body may have a spoke-like shape with a rim, a simple spoke-like shape, or the like. Furthermore, in the above embodiment, the piston is fixed to the rotating body, but since the piston performs its function by rotating together with the rotating body, for example, it may be movably engaged in the diametrical direction of the rotating body. It is also possible to provide relief for thermal strain.

FIG. 4 shows a second embodiment of the rotary piston engine according to the present invention, in which a plurality of engines shown in FIG. 1 are arranged in parallel, sharing an output shaft. Therefore, this is an appropriate means for increasing the total displacement, and by shifting the ignition timing of the combustion chambers in the corresponding rows, it is possible to achieve smooth output generation and low vibration.

[Effects of the invention] As explained above, in the rotary piston engine according to the invention, since the piston is configured to revolve in a hollow annular piston swirl path formed on the inner surface of an annular cylinder, pure circular motion is possible, resulting in a high engine speed. efficiency,
Has the effect of reducing vibration.

[Brief explanation of the drawing]

Figure 1 shows the first rotary piston engine according to the present invention.
In the schematic explanatory diagrams showing the embodiment, A is a cross-sectional view of B taken along the - line, B is a cross-sectional view of A taken along the - line, FIG. 2 is an enlarged cross-sectional view taken along the line A of FIG. 1, and FIGS. G is an operating stroke diagram of the rotary piston engine shown in FIG. 1, and FIG. 4 is a schematic cross-sectional explanatory diagram showing a second embodiment of the rotary piston engine according to the present invention. 10... Annular cylinder, 12... Piston swirl path, 14A, 14B, 14C... Upper combustion chamber, 1
6A, 16B, 16C... Combustion chamber body, 18A, 1
8B, 18C...Spark plug, 20A, 20B, 20
C... Piston, 22... Rotating body, 24... Annular passage, 26... Gas seal member, 28... Boss portion, 30... Output shaft, 32... Mounting member, 34...
...Press member, 36A, 36B, 36C... Upper combustion chamber gate valve, 38A, 38B, 38C... Intermediate gate valve, 40A, 40B, 40C... Combustion chamber gate valve, 42A, 42B, 42C... Communication pipe, 44
A, 44B, 44C... Breathing valve, 46A, 46
B, 46C... Breathing valve, 48A, 48B, 48
C... Suction valve, 50A, 50B, 50C... Exhaust valve.

Claims (1)

[Scope of utility model registration request] an annular cylinder that forms a hollow annular piston swirl path on its inner surface; and a plurality of cylinders that are fixedly attached to the annular cylinder and cover each of a plurality of openings provided at equal intervals in the annular cylinder and form an upper combustion chamber on the inner surface. a combustion chamber body, a rotating body having a rotation center at the center of a circle of the annular cylinder, and a rotating body slidably disposed in the piston swirl path of the annular cylinder so as to simultaneously face each of the combustion chamber bodies. The same number of pistons as the combustion chamber bodies engaged with the rotating body; an upper combustion chamber gate valve provided between the upper combustion chamber of each combustion chamber body and the piston swirl path of the annular cylinder; An intermediate gate valve provided in the piston swirl path at an intermediate portion between the chamber bodies, a combustion chamber gate valve provided in the piston swirl path on the side opposite to the piston rotation direction near each of the combustion chamber bodies, and each combustion chamber partition. a communication pipe that communicates with an opening provided in the piston swirling path on the side opposite to the piston rotation direction near the valve and an opening provided in each of the combustion chamber bodies near each opening, and each of the combustion chambers; A breather valve attached to an opening provided in the piston swirl path on the side opposite to the piston rotation direction near the gate valve, and a breather attached to an opening provided in the piston swirl path on the piston rotation direction side near each of the intermediate gate valves. a suction valve installed in an opening provided in the piston swirl path on the piston rotation direction side near each of the combustion chamber gate valves, and an intake valve installed in the piston swirl path on the opposite piston rotation direction side near each of the intermediate gate valves. and an exhaust valve attached to the opening.