JPH0774609B2 - Jet control internal combustion engine - Google Patents

Description

The present invention relates to a jet flow control type internal combustion engine, and more particularly to a jet flow control type internal combustion engine (engine) having an auxiliary air intake system for automobiles.
Regarding

[Conventional technology]

In the conventional internal combustion engine for automobiles, since the intake air is throttled especially by the throttle valve, the intake efficiency into the combustion chamber is poor, and further, during the idle operation and the light load operation in which the flow velocity of the intake air flowing into the combustion chamber is low, ignition and Flammability is poor.

Therefore, in general, the above ignition and deterioration of combustibility are eliminated by supplying a rich air-fuel mixture having good combustibility, that is, an air-fuel mixture having a small air-fuel ratio. There are inconveniences such as the increase of unburned gas HC and CO.

In recent years, it has been proposed to burn an air-fuel mixture that is sufficiently leaner than the stoichiometric mixture ratio, especially for the purpose of reducing harmful NOx in the exhaust gas, and a part of the exhaust gas is extracted from the exhaust system of the engine. It is also proposed to mix and burn in a mixture, but in any case, the ignitability of the mixture,
Since the combustibility is deteriorated, there is an inconvenience that drivability and fuel efficiency are deteriorated.

Therefore, in addition to the general intake port, an injection hole that strongly injects air or a lean air-fuel mixture by the negative pressure in the cylinder generated during the intake stroke is provided to give a strong swirl or turbulence to the air-fuel mixture sucked into the combustion chamber. In addition, an engine (see Japanese Patent Publication No. 56-50101) is proposed, which performs scavenging around the spark gap of the spark plug to improve ignitability and combustibility, expand the lean burn limit, and improve fuel efficiency and drivability. Has been done.

That is, as shown in FIGS. 5 to 7, a main body 1 of a four-cycle multi-cylinder gasoline engine for an automobile is mainly constituted by a cylinder block 2 and a cylinder head 3, and an intake manifold 4 is provided on one side of the cylinder head 3. The exhaust manifold 5 is fixed to the other side.

A carburetor 6 is fixed to the upper part of the exhaust manifold 4, and an air cleaner 7 is attached to the upper part of the carburetor 6, and the air purified by the air cleaner 7 is formed in the carburetor 6 and the intake manifold 4. It is guided to the intake port 9 formed in the cylinder head 3 through the main intake passage 8. The carburetor 6 of the main intake passage 8 is provided with a throttle valve 10 that opens and closes in conjunction with the operation of an accelerator pedal (not shown). A sub-intake passage 11 through which a portion is sucked is opened in the intake passage wall of the main intake passage 8.

The intake manifold 4 is integrally formed with a part of an exhaust gas recirculation passage 13 whose one end communicates with an exhaust port 12 formed in the cylinder head 3, and the other end of the passage 13 is a main intake passage in the intake manifold 4. Is in communication with.

A cooling water passage 14 that constitutes a heat riser is provided below the intake manifold 4, and a thermo sensor is provided in the passage 14.
15 is attached.

Further, a control valve 16 for controlling the recirculation amount is provided in the middle of the exhaust gas recirculation passage 13, and the control valve 16 is controlled by an operating device 17 that gives a desired opening degree according to the operating state of the engine.

Specifically, the actuating device 17 is mechanically linked to the opening of the throttle valve 10 or an intake valve generated at a specific position in the main intake passage 8 that is determined in relation to the throttle valve 10. There is one that pneumatically controls according to the magnitude of pressure.

The thermo sensor 15 detects whether the engine is in a cold state or overheat based on the engine cooling water temperature, and controls the exhaust gas recirculation amount by the control valve 16 or an ignition advance control device (not shown).

Further, the exhaust manifold 5 communicated with the exhaust port 12 of each cylinder is formed as an upper and lower two-divided structure screwed by a bolt 18, and the exhaust manifold 5 has an exhaust gas exhaust gas as shown by an arrow in FIG. A radial flow type catalyst layer 19 having a vertical axis in which is flowing is built in, and the lower portion of the exhaust manifold 5 is connected to an exhaust pipe 20.

Inside the engine body 1, a hemispherical combustion chamber 24 is formed by the inner peripheral surface of the cylinder 21 formed in the cylinder block 2, the top surface of the piston 22 and the hemispherical concave surface 23 of the cylinder head 3, and the hemispherical combustion chamber 24 is formed. The intake port 9 and the exhaust port 12 are opened at predetermined positions.

The spark plug 25 has a through hole 26 formed in the hemispherical concave surface 23.
The spark gap 27 of the spark plug 25 is arranged on or near the extension surface of the concave surface 23.

Further, a through hole 28 that is opened adjacent to the spark gap 27 is formed in the concave surface 23, and a hollow cylindrical (closed chamber type) jet piece 30 is press-fit from the combustion chamber 24 side of the through hole 28. , The jet body 32 is fitted from the opposite side, and the male thread portion provided on the outer peripheral surface of the end portion of the jet body 32 and the female thread portion provided on the inner peripheral surface of the end portion of the jet piece 30 are screwed to each other Are both clamping surfaces 33,34
The cylinder head 3 between them is sandwiched and fixed to the cylinder head 3.

Mushroom valve shaped jet valve 35 on the jet body 32
Is slidably fitted, and at the female screw side end of the jet body 32, there is a gap between the outer surface of the valve stem of the jet valve 35 and the inner surface of the jet body 32, and the sectional shape perpendicular to the axis is annular. The sub-intake passage 36 that forms the
36 communicates with a sub intake passage 38 formed in a gap between the inner peripheral surface of the through hole 28 and the outer peripheral surface of the jet body 32 through a plurality of holes 37 formed in the jet body 32. It communicates with the auxiliary intake passage 39 formed in the head 3,
The passage 39 is connected to the auxiliary intake passage 11.

The auxiliary intake passage 36 is opened to a small volume injection chamber 40 surrounded by the inner surface of the jet piece 30 and the end surface of the umbrella portion 35a of the jet valve 35, and the opening is a valve seat formed on the lower end surface of the jet body 32. The valve face of the jet valve 35 is brought into contact with 41 to be closed.

A portion of the jet piece 30 exposed to the combustion chamber 24 is formed in a hollow shell shape, and the combustion chamber 24 and the injection chamber 40 are formed in the shell portion.
An injection hole 42 communicating with the injection hole 42 is provided, and the injection hole 42 is provided at a position close to the spark gap 27 of the spark plug 25 and on a substantially extended surface of the concave surface 23, and in the vicinity of the gap 27, Moreover, from the intake port 9 to the combustion chamber 24
The air-fuel mixture sucked therein is directed in the forward direction with respect to the swirl direction shown by the arrow a in FIG.

In the figure, the injection direction from the injection hole 42 is indicated by the arrow X.
Indicated by.

The intake valve 43 that opens and closes the intake port 9 and the jet valve 35 are both mushroom valves that are driven by the same rocker arm 44. The rocker arm 44 is fitted to the rocker shaft 45 and is attached to the cam shaft 46 that is rotated by the engine. The cam 47 abuts and swings, and the arm portion on the side opposite to the contact surface with the cam 47 branches into two forks, and adjustment screws 48 and 49 are screwed to the respective branch portions. . The end surface of the adjusting screw 48 abuts the upper end surface of the valve rod of the intake valve 43, and the end surface of the adjusting screw 49 is the jet valve 35.
Is in contact with the end surface of the valve rod.

Note that 50 and 51 are valve springs, and 52 and 53 are retainers.

Further, the exhaust valve 54 that opens and closes the exhaust port 12 is opened and closed by rocking a rocker arm 56 fitted to a rocker shaft 55, and the rocker arm 56 is rocked by abutting a cam 57 provided on a cam shaft 46. .

In addition, 58 is an adjusting screw, 59 is a valve spring, and 60 is a retainer.

By the way, the center line of the through hole 28 is parallel to the axial center line of the intake valve 43, and the through hole 28 is formed by simultaneous processing when the valve guide hole of the intake valve 43 is formed, thus reducing the number of processing steps. .

Further, the through hole 28 is provided as close as possible to the rocker shaft 45, and as a result, the lift amount of the jet valve 35 is reduced, the moment of inertia and acceleration of the jet valve 35 are reduced, and the valve system load is reduced. It decreases and reliability is improved. The inner diameter of the end portion of the through hole 28 on the side of the combustion chamber 24 is formed to be slightly larger than the outer diameter of the jet piece 30, and the outer peripheral surface of the lower end portion of the jet piece 30 and the combustion chamber 24 of the through hole 28 are press-fitted.
Although a gap 61 is provided between the inner peripheral surface of the side end portion, the gap 61 not only enhances the temperature rising property and heat retaining property immediately after the engine cold start of the jet piece 30, but also during press fitting of the jet piece 30. Serves as a guide.

Also, the jet piece 30 is press-fitted into the cylinder head 3
, The injection hole 42 can be easily positioned, and it is not necessary to support the jet piece 30 when the jet body 32 is screwed.

Further, the hexagonal portion 62 is formed on the jet body 32, and the outer diameters of the valve spring 51 and the retainer 53 are formed smaller than the diameter of the hexagonal portion 62, which is a jet valve.
35 is fitted to the jet body 32 and the spring 51 and the retainer 53 are assembled, and a box wrench is fitted to the hexagonal portion 62 to fit the jet body 32 to the jet piece 30.
It can be easily screwed in to facilitate automatic assembly during production and maintenance work.

Also, the jet piece 30 is press-fitted into the cylinder head 3
In addition to being fixed to the cylinder head 3 by being screwed into the jet body 32, the jet piece 30 is completely prevented from falling off.

By the way, a threaded threaded portion between the jet piece 30 and the jet body 32 is coated with a filler having a good heat transfer property containing metal powder, and the filler improves the gas sealability of the threaded portion. , The heat transfer from the jet piece 30 to the jet body 32 is improved.

As described above, the jet piece 30 has particularly good temperature raising and heat retaining properties around the injection hole 42 due to the gap 61, and also has good heat transfer to the jet body 32 and the cylinder head 3 closely fitted by press fitting when overheating. Thus, the cooling water flowing in the cylinder head 3 effectively cools the jet piece 30 so as to prevent heat loss due to overburning or premature ignition.

Further, as shown in FIG. 8, a jet flow control type internal combustion engine equipped with an open chamber type jet piece 31 (Japanese Patent Publication No.
-42736).

Note that, in FIG. 8, the same reference numerals as those in FIGS.

That is, in the through hole 28, an open-ended (open chamber type) jet piece (hollow cylindrical tube) 31 is inserted into the combustion chamber.
It is press-fitted from the 24 side, and in this jet piece 31,
At the position closest to the spark gap 27 of the spark plug 25,
An injection hole 42 directed toward the spark jap 27 is formed.

[Problems to be solved by the invention]

However, the conventional jet flow control type internal combustion engine with the closed chamber jet piece 30 has the following problems.

(1) Jet piece 30 to give directionality to the jet flow
Since this jet piece 30 projects into the combustion chamber 24, it is necessary to use a heat-resistant high-grade material such as SUS that is heated and resistant to heat, resulting in high cost.

(2) Combustion within the jet piece 30 is less effective in terms of output.

(3) Since the SUS material or the like is used as the jet piece 30, heat dissipation from the jet valve (sub intake valve) 35 is bad and the jet valve 35 becomes high in temperature.

On the other hand, the conventional jet flow control type internal combustion engine with the open chamber type jet piece 31 has the following problems.

(1) Jet piece 31 to give directionality to the jet
Since this jet piece 31 projects into the combustion chamber 24, it is necessary to use a heat-resistant high-grade material such as SUS that is heated and resistant to heat, resulting in high cost.

(2) Since the jet body 32 is attached to the cylinder head 3 via the jet piece 31, the jet valve
The temperature of the tip of the umbrella portion 35a of 35 and the jet body 32 becomes high, and the heat load is large.

(3) According to the above item (2), the valve seat 41 is greatly worn and has low durability.

The present invention is intended to solve such a problem, and is capable of guiding the jet flow of the sub-intake air to the spark gap of the spark plug without using a jet piece. The purpose is to provide an institution.

[Means for solving problems]

Therefore, the jet flow control type internal combustion engine of the present invention is an internal combustion engine having an intake / exhaust passage connected to a combustion chamber and an ignition plug protruding into the combustion chamber, and the combustion is performed on the cylinder head in the vicinity of the spark gap of the ignition plug. The cylinder head is provided with a hole formed therein, and the cylinder head is provided with a sub-intake passage hole for connecting the internal opening of the hole and a gas supply source. A body for an auxiliary intake valve having an auxiliary intake valve capable of opening and closing a passage and a valve seat of the auxiliary intake valve is directly mounted, and the depth of the hole is almost equal to the maximum lift amount of the auxiliary intake valve. The openings of the holes are formed so as to be equal to each other, and the gap between the auxiliary intake valve at the time of maximum lift and the auxiliary intake valve is formed at a predetermined value or less. A jet along the umbrella of the valve to guide the spark gap of the spark plug, to the cylinder head itself in the opening near the hole, the injection groove or injection hole is characterized in that it is bored.

[Action]

In the above-described jet control internal combustion engine of the present invention, when the auxiliary intake valve is open, the auxiliary intake air flows from the gas supply source toward the umbrella portion of the auxiliary intake valve through the auxiliary intake passage, and The jet flow is guided through the injection groove or the injection hole toward the spark gap of the spark plug.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 4 show a jet flow control type internal combustion engine as an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main portion of a cylinder head thereof, and FIG. 2 is a bottom portion of the cylinder head thereof. Three
The drawing is an enlarged view of the III portion of FIG. 1, and FIG. 4 is an enlarged view of the IV portion of FIG. 2. In FIGS. 1 to 4, the same reference numerals as those in FIGS.

This embodiment also has substantially the same structure as the conventional jet flow control type internal combustion engine, and differs in the following points.

That is, as shown in FIGS. 1 to 4, in the present embodiment, the jet pieces 30 and 31 in each conventional example are not provided, and the jet body (sub intake valve body) 32 is directly connected to the cylinder head 3. A hole 28b that is screwed into the hole 28a for the auxiliary intake passage 36 and has a gap D (= 0.25 mm) that does not contact the outer diameter of the jet valve (auxiliary intake valve) 35.
Is the maximum valve lift position (see the chain double-dashed line in Fig. 3)
Thus, an injection groove 66 having a bottom surface is formed in a part of the hole 28b toward the ignition plug 25.

That is, in the range of the valve lift from 0 to the maximum lift L, most of the jet air is
Of the hole portion 2a so as to flow along the umbrella portion 35a and the injection groove 66 of
8b is formed in a cylindrical shape so as to mask from the maximum diameter of the jet valve 35 with a predetermined gap D.

The hole 28a, the hole 28b, and the injection groove 66 are stepped holes.

The hole 28a and the hole 28b form the through hole 28.

It should be noted that instead of the injection groove 66, an injection hole is provided in the cylinder head 3.
You may form in.

Further, reference numeral 29 in the drawing denotes an opening of the hole 28b on the combustion chamber 24 side, and 29 'denotes an internal opening of the hole 28b.

Since the jet flow control type internal combustion engine as the embodiment of the present invention is configured as described above, most of the air sucked from the air cleaner 7 to the main intake passage 8 is mixed with the fuel in the carburetor 6 to a predetermined air-fuel ratio. The intake port 9 to the combustion chamber 24
Inhaled into. On the other hand, part of the intake air is the auxiliary intake passage.
It is guided to the hole 28b through 11, 38, 39 and the auxiliary intake passage 36, and is injected into the combustion chamber 24 from the hole 28b.

At this time, most of the air whose flow has changed radially along the valve face of the auxiliary intake valve 35 is strongly injected toward the spark gap 27 direction of the spark plug 25 from the injection groove 66, and the spark gap 27 The burned gas in the vicinity is scavenged, and is directed in the forward direction of the swirl of the air-fuel mixture sucked from the intake port 9 to enhance the swirl generation of the air-fuel mixture.

Therefore, the jet flow gives a strong swirl (or turbulent flow) to the air-fuel mixture sucked into the combustion chamber 24, and is appropriately mixed with the air-fuel mixture so as to be distributed in a layered manner and to flow in a vortex shape, and further to a spark. Scavenging around the gap 27 improves ignitability and combustibility.

In this case, by appropriately selecting the hole diameter of the hole 28b and the size of the injection groove 66, the swirl generation action by the jet flow, the mixing action of the injection air and the air-fuel mixture, and the scavenging action around the spark gap 27 are optimized. It becomes possible. By the way, the injection amount and the strength of the jet flow from the hole portion 28b and the injection groove 66 change according to the opening degree of the throttle valve 10, that is, the load of the engine and the opening degree of the choke valve. That is, when the choke action of the choke valve is released and the throttle opening is small or the load is light, the throttle action of the throttle valve 10 reduces the amount of air-fuel mixture supplied from the main intake passage 8 and the combustion chamber 24.
High negative pressure is generated in the intake stroke.

On the other hand, since the main intake passage 8 on the upstream side of the throttle valve 10 is substantially atmospheric pressure, a large amount of air is generated due to the pressure difference, so
It is strongly ejected from the injection groove 66 into the combustion chamber 24 through the holes 28b via 6,38,39.

In this way, the pressure in the auxiliary intake passages 11, 36, 38, 39 becomes higher than the pressure in the main intake passage 8 due to the connection position of the auxiliary intake passage 11 to the main intake passage 8 to form a gas supply source. I am doing it.

The amount of air injected from the hole 28b and the injection groove 66 depends on the opening timing of the auxiliary intake valve 35, the period, and the auxiliary intake passages 11, 36, 38, 3.
It depends on the setting of the throttle amount etc. which is determined by the distribution area such as 9, but the most frequently used light load operation state, for example 40
When the injection amount is set to be optimal under the condition of traveling on a flat road of kg / h, assuming that the air pressure at the air intake is always atmospheric pressure, the lower the load and the lower the rotation speed, the lower the intake air passage 11 to the main intake air passage 11 becomes. , 36, 38, 39 tend to increase the intake ratio, so the lean burn limit is reduced. During cold start and warm-up, it becomes too thin, resulting in poor startability and rather fuel consumption. However, in the above embodiment, the choke valve is closed by opening the auxiliary intake passage 11 of the main intake passage 8 between the choke valve and the outer venturi. During cold start and warm-up operation, the negative pressure at the air intake of the auxiliary intake passage 11 becomes large, the injection flow rate from the hole 28b and the injection groove 66 is reduced, and it is sucked into the combustion chamber 24 by the injection air. Low lean mixture It is to improve the startability and drivability during cold.

In the present embodiment, due to the comprehensive air-fuel ratio characteristics of the air-fuel mixture sucked from the main intake passage 8 and the sub-intake passage 11, it is considerably leaner than the air-fuel mixture sucked into the conventional general engine. Since the air-fuel ratio is set to 16 or more in a wide operating region other than the above, it is possible to sufficiently reduce the emission amount of unburned gas without providing a secondary air supply device for exhaust gas purification.

In this case, the exhaust gas temperature decreases due to lean combustion, and it is particularly difficult to reburn the exhaust gas with the thermal reactor, but the exhaust pipe inside the exhaust port 12 or close to the exhaust port 12
It is sufficient to have a catalytic converter in 20.

The fuel used in this embodiment is not limited to gasoline at all, and even if other fuel such as LPG, kerosene or light oil is used, the combustibility is improved and the fuel consumption is reduced.

Further, the internal combustion engine to which the present invention can be applied is not limited to the above-mentioned embodiment, and the effects described above can be obtained by applying the present invention to other spark ignition type engines such as a two-cycle engine.

Therefore, when the present embodiment and the conventional example are operated under the same operating conditions, the surface temperature of the valve seat 41 in the conventional jet flow control type internal combustion engine equipped with the closed chamber type jet piece 30 shown in FIG. Is 280 ° C, the valve face temperature is 350 ° C, and the surface temperature of the jet piece 30 is 550 ° C. In the conventional jet control internal combustion engine having the open chamber type jet piece 31 shown in Fig. 8, the surface of the valve seat 41 is While the temperature is 280 ° C., the temperature of the cylindrical tip portion of the jet piece 31 is 350 ° C., and the valve face temperature is 380 ° C., in the jet control internal combustion engine of this embodiment shown in FIG. The surface temperature of the seat 41 is 230 ° C and the valve face temperature is 280 ° C.

As described above, in this embodiment, the temperatures of the valve seat 41 and the jet valve 35 are significantly lower than those of the conventional one.

〔The invention's effect〕

As described in detail above, according to the jet flow control type internal combustion engine of the present invention, in the internal combustion engine having the intake and exhaust passages connected to the combustion chamber and the spark plug protruding into the combustion chamber, the spark gap of the spark plug is provided. The cylinder head in the vicinity is provided with a hole formed with an opening toward the combustion chamber, and the cylinder head is provided with an auxiliary intake passage hole connecting the internal opening of the hole and a gas supply source,
An auxiliary intake valve body having an auxiliary intake valve capable of opening and closing the auxiliary intake passage and a valve seat of the auxiliary intake valve is directly mounted in the hole portion, and the hole portion has a depth of the auxiliary intake valve body. It is formed so as to be approximately equal to the maximum lift amount of the intake valve, and the opening of the hole is formed so that the gap between the auxiliary intake valve and the auxiliary intake valve at the time of maximum lift is equal to or less than a predetermined value. An injection groove or an injection hole is formed in the cylinder head itself in the vicinity of the opening of the hole to guide the jet flow along the umbrella portion of the auxiliary intake valve during the lift to the spark gap of the ignition plug. With such a simple structure, the following effects and advantages can be obtained.

(1) With the open chamber structure, the combustion in the space of the hole and the injection groove (or the injection hole) is effective for the output, so the dead volume is reduced and the overall torque is improved by 1 to 2%.

(2) Since the auxiliary intake valve body (jet body) is directly attached to the cylinder head, the temperature of the head portion of the jet valve and the tip of the jet body drops by about 30 to 50 ° C, causing wear of the valve seat, etc. Durability is improved.

(3) Since the expensive jet piece is unnecessary, the cost is reduced.

[Brief description of drawings]

1 to 4 show a jet flow control type internal combustion engine as an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a cylinder head thereof, and FIG. 2 is a bottom view of the cylinder head thereof. Three
1 is an enlarged view of a portion III in FIG. 1, FIG. 4 is an enlarged view of a portion IV in FIG. 2, FIGS. 5 to 7 show a conventional jet control internal combustion engine, and FIG. 5 is an enlarged cross-sectional view of the main part of FIG. 5, FIG. 7 is a bottom view of the main part of the cylinder head (a view taken along the line ZZ of FIG. 6), and FIG. It is a principal part longitudinal cross-sectional view of the cylinder head of another jet control internal combustion engine. 1 ... Engine body, 2 ... Cylinder block, 3 ...
Cylinder head, 4 ... Intake manifold, 5 ... Exhaust manifold, 6 ... Vaporizer, 7 ... Air cleaner, 8 ...
Main intake passage, 9 ... intake port, 10 ... throttle valve,
11 ... Sub intake passage, 12 ... Exhaust port, 13 ... Exhaust gas recirculation passage, 14 ... Cooling water passage, 15 ... Thermo sensor, 16 ...
… Control valve, 17 …… Actuator, 18 …… Bolt, 19 …… Catalyst layer, 20… Exhaust pipe, 21 …… Cylinder, 22 …… Piston, 23 ……
Hemispherical concave surface, 24 …… hemispherical combustion chamber, 25 …… spark plug,
26 ... through hole, 27 ... spark gap, 28 ... through hole, 28a ... auxiliary intake passage hole portion, 28b ... hole portion, 29, 29 '
...... Opening, 30,31 ...... Jet piece, 32 ...... Jet body (body for auxiliary intake valve), 33,34 ...... Clamping surface, 35 ...
… Jet valve (auxiliary intake valve), 35a …… Umbrella part, 36 ……
Sub intake passage, 37 ... Hole, 38, 39 ... Sub intake passage, 40 ...
Injection chamber, 41 …… Valve seat, 42 …… Injection hole, 43 …… Intake valve, 44 …… Rocker arm, 45 …… Rocker shaft, 46
...... Cam shaft, 47 …… Cam, 48,49 …… Adjust screw, 50,51 …… Valve spring, 52,53 …… Retainer, 54 …… Exhaust valve, 55 …… Rocker shaft, 56 ……
Rocker arm, 57 …… Cam, 58 …… Adjust screw, 59 …… Valve spring, 60 …… Retainer, 61 ……
Gap, 62 ... Hexagonal part, 63 ... Metal seal ring, 64 ...
… Annular groove, 65 …… Elastic ring, 66 …… Injection groove.

Front Page Continuation (72) Inventor Hiroshi Tanaka, 1 Uzumasa Tatsumi-cho, Ukyo-ku, Kyoto City, Kyoto Prefecture Mitsubishi Motors Corporation, Kyoto Works (56) References JP-A-53-11209 (JP, A) JP-A-59- 101532 (JP, A) JP-A-55-98613 (JP, A) Actually developed 58-130026 (JP, U) JP-B 56-50101 (JP, B2)

Claims (1)

[Claims] 1. An internal combustion engine having an intake and exhaust passage connected to a combustion chamber and an ignition plug protruding into the combustion chamber,
A sub-intake passage for connecting a cylinder head near the spark gap of the spark plug with a hole having an opening toward the combustion chamber, and connecting the cylinder head with an internal opening of the hole and a gas supply source. A sub-intake valve body, which has a hole, and which has a sub-intake valve capable of opening and closing the sub-intake passage and a valve seat of the sub-intake valve, is directly mounted, and the hole is The depth is formed to be substantially equal to the maximum lift amount of the auxiliary intake valve, and the opening of the hole is formed so that the gap between the auxiliary intake valve and the auxiliary intake valve at the time of maximum lift is a predetermined value or less,
In order to guide the jet flow along the umbrella portion of the auxiliary intake valve at the time of maximum lift of the auxiliary intake valve to the spark gap of the spark plug, the injection groove or the injection is made in the cylinder head itself near the opening of the hole portion. A jet control internal combustion engine, characterized in that holes are provided.