JPH10325381A - Spark ignition type internal combustion engine having air pressure pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve exhaust emission controlling performance and fuel consumption performance by supplying air pressurized by means of an air pressure pump to combustion chambers of an internal combustion engine, and thereby improving combustion states of the combustion chambers. SOLUTION: In this type of internal combustion engine 2, air pressurized by an air pressure pump 30 is fed to combustion chambers 15, 16 of the internal combustion engine 2. The air pressure pump 30 is arranged on the side portion of the internal combustion 2, and connected to one of shaft ends of a crankshaft 11 through transmitting mechanisms 22, 23, 24, 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark ignition type internal combustion engine with a pressurized air pump configured to supply air pressurized by a pressurized air pump to a combustion chamber of the internal combustion engine. .

[0002]

2. Description of the Related Art In an internal combustion engine, supply air supplied to a combustion chamber is pressurized to a high pressure to increase output and efficiency, or pressurized air pressurized to a high pressure is injected into a combustion chamber together with fuel. In order to obtain a good combustion state at the time of low-speed operation, there is a cylinder head provided with a pressurized air pump near the combustion chamber (see Japanese Patent Application Laid-Open No. 7-63141).

[0003]

2. Description of the Related Art Conventionally, a two-stroke cycle internal combustion engine generally used widely (hereinafter referred to as a two-cycle internal combustion engine) is an overhead valve type in which an intake and exhaust valve is provided in a cylinder head. Unlike a four-cycle internal combustion engine, which does not require intake and exhaust valves, its cylinder head has a simple structure and is small. However, in the spark ignition type two-cycle internal combustion engine described in The cylinder head is complicated because a pressurized air pump is provided on the cylinder head, and a one-way valve for supplying pressurized air only from the pressurized air pump to the combustion chamber is provided on the cylinder head. The structure becomes large with the structure, and the temperature of the pressurized air reaches a higher temperature than the adiabatic heating by the pressurized air pump adjacent to the high temperature combustion chamber, It becomes trouble combustion state such as Kkingu, yet requires a long belt for connecting the rotation axis of the crankshaft and a pressure pump.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an improvement in a spark ignition type internal combustion engine equipped with a pressurized air pump which overcomes such difficulties. In a spark ignition type internal combustion engine with a pressurized air pump supplied to a combustion chamber of the engine, the pressurized air pump is disposed on a side of the internal combustion engine,
The crankshaft is connected to one of the shaft ends via a transmission mechanism.

[0005] The invention according to claim 1 of the present application is configured as described above, so that the structure of the cylinder head, the cylinder block, and the crankcase of the internal combustion engine is not greatly changed, and the compressed air is not changed. As a result of the provision of the pump, the structure of these cylinder heads and other parts can be prevented from becoming complicated, the size can be avoided, and cost reduction and weight reduction can be promoted. And since the pressurized air pump is not integrated into the high-temperature cylinder head or cylinder block, not only the temperature rise of the pressurized air due to heat transfer is prevented, but also the cooling effect of the pressurized air is expected, Good combustion conditions are obtained.

According to the second aspect of the invention, the structure and the size of the cylinder head of the two-stroke internal combustion engine having no intake and exhaust valves are prevented from becoming complicated, and the two-stroke internal combustion engine is prevented. Benefits may be retained.

Further, by configuring the invention as described in claim 3, relatively high-pressure air can be reliably obtained even in a low-speed operation state.

Further, by configuring the invention as described in claim 4, the installation location of the pressurized air pump can be freely obtained.

By configuring the invention as described in claim 5, the invention as set forth in claims 1 to 4 can be easily applied to a swing power unit in which a V-belt continuously variable transmission is integrated into an internal combustion engine. Can be applied.

According to the present invention, the pressurized air pump can be installed separately from the internal combustion engine which is easily heated to a high temperature. Can be suppressed as much as possible.

Further, by configuring the invention as described in claim 7, an increase in the width of the power unit is avoided, and the size of a vehicle equipped with the power unit can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIGS. 1 to 8 will be described below. The swing power unit 1 is mounted on a scooter-type motorcycle (not shown). As shown in FIG. 1, the swing power unit 1 includes a spark-ignition two-cycle internal combustion engine 2 with a sub-combustion chamber, a V-belt continuously variable transmission 3, As shown in FIG. 2, a cylinder head 5 is provided above a cylinder block 4 of a spark ignition type two-stroke internal combustion engine 2 with a sub-combustion chamber.
Are integrally connected, and a left crankcase 6 and a right crankcase 7 that are divided into two right and left parts are integrally connected to a lower portion of the cylinder block 4.

The left crankcase 6 extends rearward,
The left crankcase 6 and the transmission case 8 detachably connected to the left outside thereof constitute a case of the V-belt continuously variable transmission 3. The V-belt continuously variable transmission 3 has an axle 9 serving as an output shaft. The rear wheel 10 is integrally mounted, and the left crankcase 6 of the spark ignition type two-stroke internal combustion engine 2 with the auxiliary combustion chamber is provided.
The power of the crankshaft 11 pivotally supported by the right crankcase 7 is transmitted to the rear wheels 10 via the V-belt continuously variable transmission 3.

Further, the cylinder hole 12 of the cylinder block 4 in the spark ignition type two-stroke internal combustion engine 2 with a sub-combustion chamber is provided.
The piston 13 is slidably fitted, and the piston 13 and the crankshaft 11 are pivotally attached to both ends of a connecting rod 14 via a piston pin and a crankpin (not shown). The crankshaft 11 is driven to rotate.

Furthermore, the main combustion chamber above the cylinder hole 12
A sub-combustion chamber 16 is formed in the cylinder head 5 so as to be adjacent to and communicate with the fuel injection valve 15. A fuel injection valve (not shown) for injecting fuel toward the pressure accumulation chamber 18 of the mixture injection electromagnetic valve 17 is provided, and the auxiliary combustion chamber is provided.
An ignition plug 19 is provided in the pressurizing chamber 16, and the accumulator 18 is connected to a discharge passage 60 of a pressurized air pump 30 via a pressurized air supply pipe 20. Reference numeral 30 is integrally attached to the transmission case 8 adjacent to the left end of the crankshaft 11.

The joint 22 is connected to the fixed face 21a of the drive V pulley 21 of the V-belt continuously variable transmission 3 provided on the left side of the crankshaft 11 of the spark ignition type two-stroke internal combustion engine 2 with the sub-combustion chamber. The drive pulley 23 is integrally mounted through the crankshaft of the pressurized air pump 30
A driven pulley 24 is integrally fitted on the drive 31, and an endless belt 25 is stretched over both drive pulleys 23 and the driven pulley 24. The spark-ignition two-cycle internal combustion engine 2 with the sub-combustion chamber is brought into an operating state and cranked. When the shaft 11 rotates, the crankshaft 31 of the pressurized air pump 30 is driven to rotate.

The drive V of the V-belt continuously variable transmission 3
Pulley 21 and driven V behind V-belt continuously variable transmission 3
An endless V-belt 27 is bridged between the pulley 26 and the driven V
The pulley 26 is connected to the axle 9 via a reduction gear mechanism 28.

The structure of the pressurized air pump 30 is configured as shown in FIGS.

That is, as shown in FIGS. 4 and 5, the cylinder case 32 of the pressurized air pump 30 is divided into two parts at the center of the axial length thereof, as shown in FIG. The crankshaft 31 is rotatably fitted to the mating portion of the divided cylinder case 32 via a ball bearing 33, and the suction valve holding ring 45 and the suction lead shown in FIG. The valve 46, the reed valve base 47 and the discharge reed valve 48 come into contact with each other, and the caps 34 are fitted at both ends of the cylinder case 32. The one cap 34 and the cylinder case 32
The distal end of a connecting bolt 35 (the head of which is shown in FIG. 5) is screwed to the other cap 34, and the divided cylinder case 32 is integrally connected by the cap 34, A cap 34 is attached to the cylinder case 32.
Are integrally mounted together with the suction valve holding ring 45, the suction reed valve 46, the reed valve base 47, and the discharge reed valve 48.

As shown in FIGS. 3 and 4,
A piston 37 is slidably fitted in a cylinder hole 36 of the cylinder case 32, and a piston pin fitted in the piston 37
One end of a connecting rod 40 is rotatably connected to 38 via a bearing 39, and the other end of the connecting rod 40 is connected to a crankpin of the crankshaft 31.
It is rotatably connected to 41 via a bearing 42,
When the crankshaft 31 is driven to rotate, the piston 37 is driven to reciprocate.

As further illustrated in FIG.
37 is one of the two pistons divided in the longitudinal direction
A coupling bolt that passes through 37 and is screwed to the other piston 37
The divided pistons 37 are integrally connected to each other by 43, and the cylinder hole 36 is partitioned by the piston 37 into two cylinder chambers 44.

Further, as shown in FIG. 8, the suction valve holding ring 4 is provided on both end faces of the cylinder case 32.
5, a suction reed valve 46, a reed valve base 47 and a discharge reed valve 48 are sequentially stacked, and the cap 34 is brought into contact with the discharge reed valve 48, and as shown in FIG. Suction reed valve 46
A dowel pin 49 penetrating through the discharge reed valve 48 is fitted in a blind hole of the reed valve base 47 and a blind pin of the reed valve base 47 and the cap 34 as shown in FIG. The suction valve retaining ring 45, the suction reed valve 46, the reed valve base 47, and the discharge reed valve 48 are fitted into the holes so that they cannot rotate around the center line of the cylinder case 32 with respect to the cylinder case 32 and the cap 34. Fixed.

The suction reed valve 46 is formed with four reeds 46a extending from the outer periphery toward the center. As shown in FIG. The suction hole 47a is openably and closably closed.

As shown in FIG. 8, the discharge reed valve 48 is formed with a semicircular notch 48a, and the center lead 48b opens and closes the discharge hole 47b of the reed valve base 47. It is designed to block freely. The suction reed valve 46 has a discharge hole in the reed valve base 47.
An elongated hole 46b through which the hole 47b can communicate is formed.

As shown in FIGS. 3 and 4,
In the center between the reed valve base 47 and the cap 34,
A suction chamber 51 is formed, and a reed valve base 47 is formed.
A discharge chamber 52 (see FIG. 4) is provided on the outer peripheral portion between
A communication block is formed on one side of the two caps 34.
53 are integrally attached by bolts 54, both ends of a suction communication pipe 55 and a discharge communication pipe 56 are fitted to the two communication blocks 53, and one suction chamber 51 is provided with a cap 34 and a communication block 53.
Is connected to the other suction chamber 51 through a suction communication passage 57 and a suction communication pipe 55 formed in
Is communicated with the other discharge chamber 52 via a discharge communication passage 58 and a discharge communication pipe 56 formed in the cap 34 and the communication block 53.

Further, as shown in FIGS. 2 and 3, a suction passage 59 communicating with an upper suction chamber 51 (in FIG. 3) is formed in the cap 34 in a horizontal direction. It is opened to the inside or connected to an air cleaner (not shown) via a communication pipe (not shown).

Further, a discharge passage 60 communicating with an upper discharge chamber 52 (FIG. 3) is formed in the cap 34 toward the front of the vehicle body, and the discharge passage 60 is connected to the pressurized air supply pipe as described above.
It is connected to the accumulator chamber 18 of the spark ignition type two-stroke internal combustion engine 2 with a sub-combustion chamber via 20 so that air in the atmosphere can be directly passed through the suction passage 59 or an air cleaner and a suction passage 59 (not shown). The air in the suction chamber 51 flows into the suction chamber 51 when the pressure in the cylinder chamber 44 becomes equal to or lower than the atmospheric pressure due to the reciprocating motion of the piston 37 fitted in the cylinder hole 36 of the pressurized air pump 30. Reed valve base 47 suction hole
When the pressure in the cylinder chamber 44 is increased to the atmospheric pressure or higher by the reciprocating motion of the piston 37, the suction reed valve
The pressurized air in the discharge chamber 52 passes through the discharge passage 60 and the pressurized air supply pipe 20 through the long hole 46b of the 46, the discharge hole 47b of the reed valve base 47, and the discharge reed valve 48. The fuel is supplied to the pressure accumulating chamber 18 of the spark ignition type two-stroke internal combustion engine 2 with a sub-combustion chamber (a surge tank (not shown) is interposed in the pressurized air supply pipe 20 to provide the auxiliary combustion chamber). The pressure of the pressurized air supplied into the accumulator 18 of the spark ignition type two-stroke internal combustion engine 2 may be equalized).

Further, as shown in FIG. 4, a cylinder hole 36 near the mating portion of the vertically divided cylinder case 32 is provided.
The suction communication pipe 55 is fitted to the relief block 61 so as to cover a periphery of a hole 55a formed in the longitudinal center of the suction communication pipe 55, and a space 61a of the relief block 61 is formed. A communication hole 32a is formed in the cylinder case 32 and communicates with the recess 36a of the cylinder hole 36. A relief valve 62 capable of contacting the opening of the communication hole 32a is provided in a space 61a of the relief block 61. 62
Is the communication hole 32a due to the spring force of the compression coil spring 63.
The pressurized air which has been pressed by the reciprocating movement of the piston 37 and has entered the space 37 a in the piston 37 is forced into the recess of the cylinder hole 36 through the side opening 37 b of the piston 37.
36a and through the communication hole 32a of the cylinder case 32,
Space 61a of relief block 61, hole 55a of suction communication pipe 55
Through the suction communication pipe 55.

The spark-ignition two-stroke internal combustion engine 2 with a sub-combustion chamber has an intake and exhaust structure similar to that of a normal two-cycle gasoline engine, and a carburetor 64 having an air cleaner (not shown) connected upstream thereof is provided with an intake pipe. The regenerative valve 67 is connected to the intake port 66 of the left crankcase 6 of the spark ignition type two-stroke internal combustion engine 2 with a sub-combustion chamber via a 65. The air-fuel mixture is sucked from the carburetor 64 into the crank chamber 68 through the intake pipe 65, the intake port 66, and the reed valve 67, and the air-fuel mixture pre-pressurized in the crank chamber 68 during the downward stroke of the piston 13 passes through the scavenging port 69. The main combustion chamber 15 is supplied.

Since the embodiment shown in FIGS. 1 to 8 is configured as described above, in the operating state of the spark ignition type two-stroke internal combustion engine 2 with the auxiliary combustion chamber, the rotation of the crankshaft 11 accompanies. By moving the piston 13 up and down, the vaporizer 64
Is supplied into the main combustion chamber 15 and the rotation of the crankshaft 31 of the pressurized air pump 30 interlocked with the rotation of the crankshaft 11 causes the piston 37 to reciprocate. The pressurized air from the discharge passage 60 of the pressure-accumulating chamber of the solenoid valve 17 for injection of the air-fuel mixture through the pressurized air supply pipe 20
When the crankshaft 11 of the spark ignition type two-cycle internal combustion engine 2 with the sub-combustion chamber reaches a required crank angle, the mixture injection solenoid valve 17 is opened and injected from a fuel injection valve (not shown). The pressurized air in the accumulator 18 is injected into the sub-combustion chamber 16 together with the fuel, and stratified air supply is formed in the sub-combustion chamber 16.

In this state, the ignition plug 19 operates and the auxiliary combustion chamber is operated.
A spark is generated in the combustion chamber 16, and the spark ignites the stratified charge in the sub-combustion chamber 16, and the fuel spreads to the air-fuel mixture in the main combustion chamber 15. It is.

As a result, under a high load condition, a relatively rich air-fuel mixture is supplied into the main combustion chamber 15 so that not only a sufficient high output operation is performed, but also under a low load, particularly under an idling condition. The lean air-fuel mixture is stratified and supplied into the main combustion chamber 15, and almost complete combustion is performed without leaving unburned gas, so that it is possible to reduce hydrocarbon emissions and improve fuel efficiency.

Further, the pressurized air pump 30 is provided adjacent to the transmission case 8 of the V-belt continuously variable transmission 3 without being adjacent to the spark ignition type two-stroke internal combustion engine 2 having a high-temperature auxiliary combustion chamber. The temperature rise of the pressurized air pressurized by the air pump 30 is suppressed as much as possible, and abnormal combustion in the sub-combustion chamber 16 and the main combustion chamber 15 can be avoided.

Further, since the pressurized air pump 30 is arranged near the crankshaft 11 of the spark ignition type two-cycle internal combustion engine 2 with the sub combustion chamber, the spark ignition type two cycle internal combustion engine 2 with the sub combustion chamber and the V belt are not provided. It is not necessary to change the structure of the main body of the step transmission 3 to a large width, so that an increase in weight and an increase in cost can be avoided.

Further, since the pressurized air pump 30 is a reciprocating double-acting pump, the required supply pressure can be sufficiently obtained even in the low-speed operation state of the spark ignition type two-cycle internal combustion engine 2 with the sub-combustion chamber.

Further, since the pressurized air pump 30 is mounted on the transmission case 8 of the V-belt continuously variable transmission 3, it is sufficient to simply change the mounting portion of the pressurized air pump 30 on the transmission case 8. There is no need to change the structure of the spark ignition type two-stroke internal combustion engine 2 with the auxiliary combustion chamber.

In the embodiment shown in FIGS. 1 to 8, V
Although the pressurized air pump 30 is disposed outside the transmission case 8 of the belt continuously variable transmission 3, as shown in FIG. The width of the power unit 1 is the same as that when the pressurized air pump 30 is not provided, so that the vehicle width does not increase, which is convenient for running the vehicle.

As shown in FIG. 10, a pressurized air pump 30 may be provided at the end of the crankshaft 11 on the side of the generator 70 and the cooling fan 71 opposite to the V-belt continuously variable transmission 3, In the embodiment shown in FIG. 10, the cooling air passing through the duct 72 of the cooling fan 71
It is possible to cool more effectively than above.

Further, the present invention can be applied to not only a two-cycle internal combustion engine but also a four-cycle internal combustion engine.

[Brief description of the drawings]

FIG. 1 is a side view of a swing power unit incorporating a spark ignition type two-stroke internal combustion engine with a sub-combustion chamber according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of FIG.

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

FIG. 4 is a longitudinal sectional view cut along the line IV-IV of FIG. 3;

FIG. 5 is a vertical sectional view cut along the line VV in FIG. 4;

FIG. 6 is a view taken along line VI-VI of FIG. 3;

FIG. 7 is a view taken along line VII-VII of FIG. 4;

FIG. 8 is an exploded view of a suction / discharge reed valve of the pressurized air pump.

FIG. 9 is a longitudinal sectional view of another embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of still another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Swing power unit, 2 ... Spark ignition type 2-cycle internal combustion engine with auxiliary combustion chamber, 3 ... V-belt continuously variable transmission, 4
... Cylinder block, 5 ... Cylinder head, 6 ... Left crankcase, 7 ... Right crankcase, 8 ... Transmission case, 9 ... Axle, 10 ... Rear wheel, 11 ... Crankshaft, 12
... Cylinder bore, 13 ... Piston, 14 ... Connecting rod, 15 ... Main combustion chamber, 16 ... Sub combustion chamber, 17 ... Electromagnetic mixture injection valve, 18 ... Pressure accumulation chamber, 19 ... Spark plug, 20 ... Pressurized air supply pipe ,twenty one
... Drive V pulley, 22 ... Fitting, 23 ... Drive pulley,
24: driven pulley, 25: endless belt, 26: driven V
Pulley, 27: Endless V-belt, 28: Reduction gear mechanism, 30: Pressurized air pump, 31: Crank shaft, 32: Cylinder case, 33: Ball bearing, 34: Cap, 35: Coupling bolt, 36: Cylinder hole, 37 ... piston, 38 ... piston pin, 39 ... bearing, 40 ... connecting rod, 41
... crank pins, 42 ... bearings, 43 ... connecting bolts, 44
... Cylinder chamber, 45 ... Suction valve retainer ring, 46 ... Suction reed valve, 47 ... Reed valve base, 48 ... Discharge reed valve, 49 ... Dowel pin, 50 ... Dowel pin, 51 ... Suction chamber, 52 ... Discharge chamber, 53 ... Communication Block, 54… bolt, 55…
Inlet communication pipe, 56 ... discharge communication pipe, 57 ... suction communication path, 58 ... discharge communication path, 59 ... suction path, 60 ... discharge path, 61 ... relief block, 62 ... relief valve, 63 ... compression coil spring, 64 ... Vaporizer, 65… intake pipe, 66… intake port, 67…
Reed valve, 68 ... crank chamber, 69 ... scavenging port, 70 ... generator, 71 ... cooling fan, 72 ... duct.

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[Procedure amendment]

[Submission date] July 6, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

2. Description of the Related Art Conventionally, a two-stroke cycle internal combustion engine generally used widely (hereinafter referred to as a two-cycle internal combustion engine) is an overhead valve type in which an intake and exhaust valve is provided in a cylinder head. Unlike a four-cycle internal combustion engine, which does not require intake and exhaust valves, its cylinder head has a simple structure and a small size. The cylinder head has a complicated structure because the compressed air pump is provided on the cylinder head, and the cylinder head is provided with a one-way valve for supplying pressurized air only to the combustion chamber from the compressed air pump. temperature of the pressurized air by the size to cause, also pressurized air pump adjacent the hot combustion chamber together is, reaches or exceeds the high temperatures that are adiabatically heated,
An abnormal combustion state such as knocking occurs, and a long belt for connecting the crankshaft and the rotating shaft of the pressurized air pump is required.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

That is, as shown in FIGS. 4 and 5, the cylinder case 32 of the pressurized air pump 30 is divided into two parts at the center of the axial length thereof, as shown in FIG. In addition, the crankshaft 31 is connected to the mating portion of the divided cylinder case 32 via a ball bearing 33.
Are rotatably fitted, and a reed valve assembly including a suction valve press ring 45, a suction reed valve 46, a reed valve base 47, and a discharge reed valve 48 shown in FIG. And caps 3 on both ends of the cylinder case 32.
4 is fitted, and the tip of a coupling bolt 35 (the head of which is shown in FIG. 5) penetrating the one cap 34 and the cylinder case 32 is screwed to the other cap 34, and the cap 34 The divided cylinder case 32 is integrally connected, and the cap 34 is integrally attached to the cylinder case 32 together with the suction valve retaining ring 45, the suction reed valve 46, the reed valve base 47, and the discharge reed valve 48. I have.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

Further, as shown in FIGS. 2 and 3, a suction passage 59 communicating with the upper suction chamber 51 (in FIG. 3) is formed in the cap 34 in a horizontal direction. It is open to the atmosphere or connected to an air cleaner (not shown) via a communication pipe (not shown).

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

Further, as shown in FIG. 4, a shallow concave portion 36a is formed in the cylinder hole 36 near the mating portion of the vertically divided cylinder case 32, and is formed at the longitudinal center of the suction communication pipe 55. The suction communication pipe 55 is fitted into the relief block 61 so as to cover the outer periphery of the hole 55a, and a communication hole 32a that connects the space 61a of the relief block 61 and the concave portion 36a of the cylinder hole 36 is formed in the cylinder case 32. A relief valve 62 that can contact the opening of the communication hole 32a is provided in the space 61a of the relief block 61, and the relief valve 62 is pressed against the opening of the communication hole 32a by the spring force of the compression coil spring 63. pressurized air which has entered the space 37a of the pressurized piston 37 by the reciprocating motion of the piston 37, the side of the piston 37 Cylinder from the opening 37b hole 36
Recess 36a and the communication hole 32a of the cylinder case 32
Through the space 61a of the relief block 61 and the hole 55a of the suction communication pipe 55, and is discharged into the suction communication pipe 55.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

In this state, the spark plug 19 operates, and a spark is generated in the sub-combustion chamber 16.
The stratified supply air is ignited, the combustion spreads to the air-fuel mixture in the main combustion chamber 15, and stratified combustion is performed in the main combustion chamber 15.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

As shown in FIG. 10, a generator 70 and a cooling fan 71 on the opposite side of the V-belt continuously variable transmission 3 are provided.
A pressurized air pump 30 may be provided at the end of the crankshaft 11 on the side, and in the embodiment shown in FIG.
With the cooling air passing through the duct 72 of the cooling fan 71, the pressurized air pump 30 can be more effectively cooled.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8 is an exploded view of the suction / discharge reed valve assembly of the pressurized air pump.

[Procedure amendment 9]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

[Procedure amendment 10]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

[Procedure amendment 11]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02M 67/12 F02M 67/12

Claims (7)

[Claims] 1. A spark ignition type internal combustion engine with a pressurized air pump in which air pressurized by a pressurized air pump is supplied to a combustion chamber of the internal combustion engine. And a spark ignition type internal combustion engine with a pressurized air pump, which is connected to one of the shaft ends of a crankshaft via a transmission mechanism. 2. The spark ignition type internal combustion engine with a pressurized air pump according to claim 1, wherein said internal combustion engine is a two-cycle internal combustion engine. 3. The spark ignition type internal combustion engine with a pressurized air pump according to claim 1, wherein the pressurized air pump is a reciprocating double-acting pump. 4. The spark ignition type internal combustion engine with a pressurized air pump according to claim 1, wherein said transmission mechanism is a belt transmission mechanism. 5. A pressurized air pump according to claim 1, wherein said internal combustion engine is integrated with a V-belt continuously variable transmission to constitute a swing power unit for a vehicle. Spark ignition internal combustion engine. 6. The spark ignition type internal combustion engine with a pressurized air pump according to claim 5, wherein the pressurized air pump is mounted on a casing of the V-belt continuously variable transmission. 7. The pressurizing device according to claim 5, wherein the pressurized air pump is located above the V-belt continuously variable transmission and is disposed on a side of a cylinder portion of the internal combustion engine. Spark ignition type internal combustion engine with air pump.