JPS6121553Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reciprocating type two-stroke engine in which a rotating shaft is provided so as to pass through a cylinder, and the vertical movement of a piston is directly converted into rotation of the rotating shaft.

Conventionally, in reciprocating two-stroke engines, one end of the connecting rod is connected to the piston that reciprocates within the cylinder, and the crankshaft is connected to the other end, converting the reciprocating motion of the piston into rotational motion of the crankshaft. ing. Therefore, although the seal structure between the cylinder and the piston is simple, the mechanical efficiency is low because it converts linear motion into rotation. On the other hand, a rotary engine was developed that directly converts the explosion pressure caused by combustion of an air-fuel mixture into rotational motion without using a connecting rod, but there are various problems with sealing the combustion gas.

The present invention uses a reciprocating two-stroke engine in which a slider is loosely engaged within the piston without using a connecting rod, and the rotating shaft of an eccentric wheel rotatably installed within the slider is connected to the piston's length. It protrudes to the outside through the hole and the through hole of the cylinder, so that the reciprocating motion of the piston is directly converted into rotation of the rotating shaft via the slider and eccentric ring, and the piston lower space or slider side space The purpose of this project is to construct a scavenging pump that precompresses the air-fuel mixture, thereby creating a two-stroke engine with a simple structure and high mechanical efficiency.

Embodiments of the present invention will be described below based on the drawings.

First, FIGS. 1 to 9 show the basic structure of the present invention.

In the two-stroke engine shown in FIGS. 1 and 2, 1 is a cylinder, 2 is a cylindrical piston,
3 is a slider, 4 is a rotating shaft, and 5 is an eccentric ring.

As shown in FIGS. 3 and 4, the piston 2 has a cylindrical body provided with a sliding hole 6 in the horizontal direction, and a long hole 7 that is vertically long and perpendicular to the sliding hole 6. It is being As shown in FIG. 5, the slider 3 has external dimensions that closely fit into the sliding hole 6 of the piston 2, and a circular hole 8 is provided in the center. As shown in FIG. 6, the rotating shaft 4 and the eccentric wheel 5 are configured such that a disk-shaped eccentric wheel 5 is integrally fixed to the rotating shaft 4 at a position offset from the center.
has an outer diameter that fits closely with the circular through hole 8 of the slider 3.

A slider 3 is loosely fitted into the sliding hole 6 of the piston 2, and a circular through hole 8 of the slider 3 is perpendicular to the sliding hole 6, and a hole is formed in the center of the circular through hole 8. The eccentric ring 5 is loosely engaged, and the rotating shaft 4 passes through the elongated hole 7 of the piston 2, projects outward from a through hole 9 provided at a symmetrical position in the side wall of the cylinder 1, and is supported by a suitable bearing.

Note that 10 is a sealing material between the cylinder 1 and the piston 2, and a spark plug 12 is installed in the cylinder head 11.
The cylinder 1 is provided with a scavenging port 1 which will be described later.
3. The exhaust port 14, intake port, etc. are opened.

The operations accompanying the ignition and explosion of the air-fuel mixture in the above two-stroke engine will be explained. FIG. 1 shows a state in which the piston 2 has reached the top dead center of the compression stroke, and the tip of the eccentric wheel 5 (the point farthest from the center of the rotating shaft 4) is directly above it. When the air-fuel mixture is ignited and exploded near top dead center, the piston 2 is pushed down, and the slider 3 is also pushed down accordingly.
The eccentric ring 5 is accordingly subjected to a force that causes it to rotate clockwise within the circular through hole 8 of the slider 3 about the rotating shaft 4 . The rotation of the eccentric wheel 5 causes the slider 3 to slide to the right along the slide hole 6 by its tip, and as a result, the slider 3 moves downward and to the right while eccentrically moving. The ring 5 rotates clockwise, the piston 2 moves the rotating shaft 4 along the elongated hole 7, and descends.As shown in FIG. comes to the right edge. When the piston 2 further descends, the slider 3 moves downward together with the piston 2 to rotate the eccentric wheel 5, and the slider 3 itself is slid from the right end to the left by the tip of the eccentric wheel 5. ,
As shown in FIG. 8, the state of bottom dead center has been reached, and the tip of the eccentric wheel 5 is facing downward. When the piston 2 rises from the bottom dead center, the slider 3 rises,
As the eccentric wheel 5 further rotates, the slider 3 slides to the left by the tip of the eccentric wheel 5, and as shown in FIG. Mover 3 comes to the left end. Subsequently, the piston 2 further rises and reaches the top dead center. The rotation shaft 4 rotates clockwise due to the movements of the piston 2, slider 3, and eccentric wheel 5 as described above.

Next, an embodiment will be described in which a scavenging pumping action is provided to the space below the piston 2 or to the side space of the slider 3 in the piston 2 in the above basic structure.

<Example 1> In the two-stroke engine shown in FIGS. 10 and 11, the lower surface of the cylinder 1 is closed by a bottom wall 15 to form a piston lower space 16, and the intake air provided in the piston lower space 16 is Mouth 17
A carburetor 19 is connected via a check valve 18 to
The communication port 20 is connected to the scavenging port 13 of the combustion chamber 22 via the scavenging passage 21 .

To explain the operation, FIG. 10 shows the scavenging state, and when the piston 2 rises, the piston lower space 1
The air-fuel mixture taken in by No. 6 is compressed by the downward movement of the piston 2, passes through the scavenging passage 21, is ejected from the scavenging port 13 into the combustion chamber 22, and is scavenged. The air-fuel mixture injected into the combustion chamber 22 is compressed by the upward stroke of the piston 2, and is ignited and exploded by the spark plug 12. The combustion gas after the explosion is released from the exhaust port 14, which is opened by the downward movement of the piston 2.

In addition to the reed valve shown in FIG. 10, the check valve 18 for intake of the mixture may be a poppet valve, a rotary valve, a piston valve control system, or the like as appropriate.

<Example 2> In the two-stroke engine shown in FIG. 12, in Example 1, left and right slider side spaces 23 formed between the slider 2 and the cylinder 1 in the piston 2, Inlet ports 25, 25 communicating with 24
and discharge ports 26, 26 are provided in the cylinder 1, and the suction port 25 is connected to the carburetor 1 via a check valve 27.
9 is connected, and the discharge port 26 is communicated with the combustion chamber 22 by an auxiliary scavenging passage 28, and the other structure of the piston 2 is provided in the same manner as in the previous example.

In this two-stroke engine, double scavenging is performed by main scavenging air from the scavenging passage 21 through the piston lower space 16 and auxiliary scavenging air from the auxiliary scavenging air passage 28 through the left and right slider side spaces 23 and 24. It is used for stratified air supply by changing the air-fuel ratio.

Note that scavenging means may be provided only in the left and right slider side spaces 23 and 24 to perform the scavenging action.

<Example 3> In the two-stroke engine shown in FIG. 13, in Example 1, a check valve 27 is installed in the left slider side space 23 at the intake port 25 provided in the cylinder 1.
The slider 3 is provided with a through hole 29 that communicates the left and right slider side spaces 23 and 24 with each other, and the right slider side space 24 and the piston lower space are connected to each other. 16 through a communication passage 31 having a check valve 30, and the piston lower space 16 communicates with the scavenging port 13 through a scavenging passage 21.

In this two-stroke engine, the air-fuel mixture is sucked into the left slider side space 23 from the carburetor 19, is introduced into the right slider side space 24 through the through hole 29, and is introduced into the right slider side space 24 through the communication passage 31 under the piston. Piston 2 to space 16
is introduced into the combustion chamber 22 from the scavenging port 13 during the scavenging stroke, and when the air-fuel mixture passes through the left and right slider side spaces 23 and 24, the sliding part and the piston , the cylinder is lubricated and cooled, and the air-fuel mixture is heated to promote atomization.

Note that the check valve 30 of the communication path 31 does not need to be installed.

<Example 4> The two-stroke engine shown in FIG. 14 is the same as that of Example 1, except that the left and right slider side spaces 23,
This is to introduce lubricating oil into the oil tank 3.
2 through check valves 33 respectively, an inlet 34,
It communicates with the discharge port 35. The slider 3 is provided with an oil hole 36 communicating with the circular through hole 8.

The oil introduced into the slider side spaces 23 and 24 is
This is used to lubricate and cool each sliding part.

<Example 5> In the two-stroke engine shown in FIG.
3, exhaust gas combustion air is supplied, and oil is supplied in the right slider side space 24, respectively.

That is, the cylinder 1 constituting the left slider side space 23 is provided with an intake pipe 37 and an air outlet 38 via check valves, and air is injected from the air outlet 38 to the exhaust port 14 via an air pipe 39. Nozzle 40 is open. Due to the reciprocating movement of the slider 3 within the piston 2, the air sucked from the intake pipe 37 is transferred to the air outlet 3.
8 to the blower pipe 39, and is injected into the exhaust port 14 from the injection nozzle 40. Also, this air
It also contributes to cooling the cylinder 1, piston 2, and slider 3 that are heated by the combustion gas.

<Embodiment 6> Fig. 16 shows a two-stroke engine having two combustion chambers, in which a piston 42 housed in a cylinder 41 is provided with a sliding hole 6 and a slider 3 as in the previous embodiment. The eccentric ring 5 of the rotating shaft 4 is loosely engaged with the circular through hole 8 of the slider 3, and the piston 4
Combustion chambers 22, 22 are formed above and below 2, respectively, and are configured to be ignited and exploded alternately by spark plugs 12, 12.

Each combustion chamber 22 is provided with a scavenging port 13 and an exhaust port 14, and the scavenging port 13 is connected to the slider side spaces 23, 24.
A discharge port 26 provided in the cylinder 41 corresponding to
It communicates with Further, the cylinder 41 is provided with an inlet 25 communicating with the slider side spaces 23 and 24, a carburetor 19 is attached via a check valve 27, and an external pump 43 for promoting scavenging action is connected. ing.

Incidentally, an external pump as in the sixth embodiment may also be provided in the first to fifth embodiments in order to promote scavenging, fuel supply, and re-combustion of exhaust gases by pumping the space under the piston or the space on the side of the slider.

As described above, according to the present invention, when the piston moves up and down within the cylinder, the slider moves up and down while rotating the eccentric ring, and also slides left and right, thereby controlling the up and down movement of the piston. Since the rotation is directly the rotation of the rotating shaft, and the vertical motion is directly converted into rotational motion, rotation with high mechanical efficiency can be obtained. Furthermore, since the conventional seal structure between the cylinder and the piston can be used as the seal part, the structure is simpler than that of a rotary engine, and the sealing effect is reliable.

Furthermore, according to the present invention, the connecting rod and crankcase part of conventional reciprocating internal combustion engines are no longer required, and the rotating shaft is structured to protrude from the cylinder, so the overall height of the engine can be significantly lowered and the weight can be reduced. It is also possible to greatly increase the number of people.

Furthermore, according to the present invention, since the piston lower space or the slider side space is used for the scavenging pump, there is no need to provide a separate scavenging pump, or the scavenging pump can be made smaller. This simplifies the engine accessories, making it possible to further reduce the size and weight of the engine.Furthermore, by using the space on the side of the slider for the scavenging pump, it becomes possible to directly cool the piston. At the same time, an excellent effect is obtained in that the mixture is heated and atomization is promoted.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main part showing the basic structure, Fig. 2 is a cross-sectional view of the main part along the line A-A in Fig. 1, Fig. 3 is a longitudinal cross-sectional view of the piston, and Fig. 4 is the Fig. 3 5 is a cross-sectional view of the slider, FIG. 6 is a perspective view showing the rotating shaft and eccentric ring, and FIGS. 7 to 9 are main points showing the operating stroke. FIG. 10 is a cross-sectional view of a main part showing Example 1, FIG. 11 is a cross-sectional view taken along line C-C in FIG. 10, and FIGS. 12 to 16 are Example 2 to Example 1, respectively. FIG. 6 is a cross-sectional view of main parts of FIG. 1... Cylinder, 2... Piston, 3... Slider, 4... Rotating shaft, 5... Eccentric ring, 6... Sliding hole, 7... Elongated hole, 8... Circular through hole, 9 ...through hole,
10...Sealing material, 11...Cylinder head, 1
2... Spark plug, 13... Scavenging port, 14... Exhaust port, 15... Bottom wall, 16... Piston lower space, 23, 24... Slider side space.

Claims (1)

[Claims for Utility Model Registration] (1) The cylindrical piston that reciprocates up and down within the cylinder has a sliding hole in the horizontal direction passing through the center and a long hole in the direction perpendicular to the sliding hole. is provided, a slider is slidably fitted in the slide hole along the slide hole, and the slider has a circular through hole bored in a direction perpendicular to the slide hole. death,
An eccentric ring provided on a rotating shaft passing through the elongated hole and the circular through hole in a direction perpendicular to the sliding hole is rotatably engaged with the circular through hole, and the rotating shaft rotates according to the vertical movement of the piston. A two-stroke engine driven by a piston lower space or a slider side space within the piston constitutes a scavenging pump that introduces an air-fuel mixture, precompresses it, and supplies it to a combustion chamber. (2) The space below the piston constitutes a scavenging pump,
The two-stroke engine according to claim 1, wherein the slider side space in the piston constitutes a lubricating oil pump that introduces lubricating oil and supplies oil to various parts of the engine.