JPS6018594Y2 - Rotary piston engine with supercharger - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a supercharged engine, and more specifically,
The main intake system has a main intake port that sucks the air-fuel mixture by the intake negative pressure in the working chamber, and an auxiliary intake system that has a supercharging port that supplies the air-fuel mixture or air pressurized by a supercharger. It is related to a rotary piston engine with a supercharger.

In general, it is well known that all of the intake air in the intake process of an engine is pressurized and sucked by a supercharger to increase charging efficiency and improve the output performance of the engine.

However, in this case, all the intake air drawn into the engine passes through the supercharger, so when not supercharging, the supercharger itself becomes a ventilation resistance, which reduces charging efficiency and reduces output performance. Furthermore, during supercharging, all of the intake air taken into the engine is adiabatically compressed and heated to high temperature by the supercharger, so there is a problem that the density of the intake air becomes low and the charging efficiency is not sufficiently improved.

This problem also occurs in rotary piston engines, so conventionally, for example, in Japanese Patent Application No. 55-137317, a main intake system having a main intake port that sucks the air-fuel mixture by the intake negative pressure in the working chamber of the engine is used. ,
An auxiliary intake system is provided with a supercharging port that supplies air-fuel mixture or air pressurized by a supercharger, and intake is performed by natural intake due to negative pressure and supercharging by the supercharger,
A relatively small-capacity supercharger has been proposed that effectively improves charging efficiency over the entire rotation range of a rotary piston engine.

However, even in a supercharged engine with such a structure, the intake air temperature increases due to supercharging itself.
In addition, abnormal combustion such as knocking occurs due to an increase in intake air temperature due to an increase in combustion gas brought in due to an increase in the exhaust pressure of the rotary piston due to supercharging.

Among these, abnormal combustion due to the rise in intake air temperature caused by supercharging itself can be prevented by cooling the supercharged air with a cooler before supplying it to the engine, but this can lead to an increase in the amount of combustion gas brought in. Conventionally, there was no solution to the abnormal combustion caused by the rise in intake air temperature.

Therefore, an object of the present invention is to provide a rotary piston engine with a supercharger that can prevent abnormal combustion caused by the introduction of combustion gas.

For this reason, the present invention has a main intake system having a main intake port that sucks the air-fuel mixture by the intake negative pressure in the working chamber of the engine, and a main intake system that supplies the air-fuel mixture or air pressurized by a supercharger, and In a rotary piston engine with a supercharger, which is equipped with an auxiliary intake system having a supercharging port that closes after a set time, the main intake port is
The supercharging port is formed so that its opening timing is after the exhaust port is closed, and the supercharging port is formed so that the opening timing of the supercharging port is earlier than the opening timing of the main intake port and overlaps with the opening timing of the exhaust port. The combustion gas is completely scavenged by the high-pressure part of the supercharger during the final part of the exhaust stroke or the scavenging stroke, and the combustion gas is completely prevented from being carried into the next combustion process.1. This is characterized by ensuring normal combustion without knocking or the like.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A supercharged rotary piston engine according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, numeral 1 indicates a rotary piston engine, numeral 2 an intake system, and numeral 3 an exhaust system.

The engine 1 includes a casing 6 formed of a rotor housing 4 having a trochoidal inner peripheral surface 4a and side housings 5 disposed on both sides of the rotor housing 4.

Inside this casing 6, a triangular rotor 7 has its top portion slidably contacted with the trochoid inner peripheral surface 4a, and its side surface 7.
A and the inner surface of the casing 6 are mounted so that planetary rotational movement can be made within the casing 6 while controlling the variable volume working chamber 8.

A main intake port 9 and a supercharging port 10 are formed in the side housing 5 of the casing 6, and an exhaust port 11 is formed in the rotor housing 4.

During the intake stroke, the main intake port 9 and the supercharging port 10 are opened and closed at predetermined timings to intake air into the intake working chamber 8a.

In addition, the main intake port 9, supercharging port 10, and exhaust port 11 are provided with a main intake system 12 and an auxiliary intake system 13, respectively.
, an exhaust system 3 is connected.

With this main intake system 12 and auxiliary intake system 13, the intake system 2
It consists of

The main intake system 12 includes a main intake passage 14 and a throttle valve 1
5a, and an air cleaner 16 is provided at the inlet end of the main intake passage 14.

The auxiliary intake system 13 has an auxiliary intake passage 17 that communicates between the air cleaner 16 and the supercharging port 10.

This auxiliary intake passage 17 includes the engine 1 in order from the upstream side.
A supercharger 18 consisting of a vane type air pump and a supercharging port control valve 19 are provided.

The supercharger 18 is connected to the engine output shaft by a clutch or the like when the load of the engine 1 is higher than the set load, and the supercharging port control valve 19 opens and closes the supercharging port 10 according to the load of the engine 1. For example, it is linked to the throttle valve 15a.

The shape of the supercharging port 10 is such that, as is clear from FIG.
The opening period of the exhaust port 11 is earlier than the opening period of the exhaust port 11 and overlaps with the opening period of the exhaust port 11, that is, the opening period of the exhaust port 11 is opened before the exhaust port 11 is completely closed.

In this example, the main intake port 9 is formed so that there is no overlap with the exhaust port 11.

Next, the operation of the supercharged rotary piston engine of the present invention will be explained with reference to FIGS. 2 and 3.

Note that FIG. 3 is a diagram showing the opening and closing states of the main intake port 9, supercharging port 10, and exhaust port 11. In this figure, the solid line indicates the opening and closing state of the exhaust port 11.
The dashed line indicates the open/closed state of the supercharging port 10, and the broken line indicates the open/closed state of the main intake port 9, respectively.

When the engine load is above a predetermined value, the throttle valve 15a
The valve 19 linked to the exhaust port 11 is opened, and under this condition, at the end of the exhaust stroke after opening the exhaust port 11, the rotor 7 assumes a position as shown by the broken line in FIG.
When the supercharging port 10 starts to open, this supercharging port 10
The supercharged air is supplied from the opened part into the working chamber 8b during exhaustion, and this supercharged air causes the hatched part A in FIG.
During the overlap period shown by , scavenging inside the working chamber 8b is performed.

This scavenging by supercharging is carried out until the rotor 7 assumes the position shown by the chain line in FIG. 2, that is, until the exhaust port 11 is completely closed and before the main intake port 9 is opened.

When the main intake port 9 is opened, natural intake is performed by the main intake system 12.

In this way, the intake stroke begins with the opening of the main intake port 9, but at the end of this intake stroke, even after the main intake port 9 closes, the supercharging port 10 remains open, as shown by the hatched part in Fig. 3. Supercharging by the supercharging port 10 is performed at the same time.

When the engine load is below a predetermined value, the drive of the supercharger 18 is cut off, but since the supercharging port 10 is also closed by the valve 19, the supercharging port 18 is closed during the overlap period.
The amount of combustion gas brought into the intake working chamber is extremely small, ensuring combustion stability at low loads.
Combustion at low loads can be improved.

For this purpose, it is desirable to provide the valve 19 as close to the supercharging port 10 as possible.

As explained above, according to the rotary piston engine with a supercharger of the present invention, when the engine load is above a predetermined value, the supercharging port is opened at the end of the exhaust stroke, and the Since the combustion gas is scavenged using the high-pressure supercharged air, the combustion gas is almost completely prevented from being brought into the intake working chamber, thereby ensuring normal combustion without combustion or the like.

Also, during light load operation when the engine load is below a predetermined value,
Since the supercharging port is closed by the control valve and the opening/closing periods of the main intake port and the exhaust port do not overlap, combustion gas is prevented from being carried into the intake working chamber in a non-supercharging state.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of a rotary piston engine system schematically showing an embodiment of the present invention, FIG. 2 is a schematic diagram showing the main parts of the rotary piston engine shown in FIG. 1, and FIG. 3 is a diagram showing the opening and closing states of the main intake port, supercharging port, and exhaust port of the rotary piston engine shown in FIGS. 1 and 2. FIG. 1...Rotary piston engine, 2...
...Intake system, 3...Exhaust system, 7...Data, 9...Main intake port, 10...
Supercharging port, 11...Exhaust port.

Claims (1)

[Scope of utility model registration request] A main intake system having a main intake port that sucks the air-fuel mixture due to the intake negative pressure in the working chamber, and a supercharging system that supplies the air-fuel mixture or air pressurized by a supercharger and closes the main intake port after a set time delay. In a rotary piston engine with a supercharger, which is equipped with an auxiliary intake system having a port, the main intake port is shaped such that the main intake port opens after the exhaust port closes, and the supercharging The port is formed such that the opening timing of the supercharging port is earlier than the opening timing of the main intake port and overlaps with the opening timing of the exhaust port, and a valve is provided that closes the supercharging port when not supercharging. A rotary piston engine with a supercharger.