JPS58126431A - Supercharge device of rotary piston engine - Google Patents

Abstract

PURPOSE:To control the timing of opening and closing a supercharge port, by providing the supercharge port in a position, in which the supercharge port is opened after a natural intake port is closed by a rotor and closed before ignition, in addition to the natural intake port in a side housing. CONSTITUTION:Intake air from an intake passage 11 is supplied to an intake working chamber 5a from the first intake port 6 used for natural intake air, if the port 6 is closed by rotary motion of a rotor 4, the second intake port 9 used as a supercharge port is opened. Accordingly, intake air pressurized by a supercharger 13 is mixed with fuel injected from an injector 17 and supplied to a compression working chamber 5b, then a spark plug 7 is ignited and fired at about the compression top dead center. Here the port 9 is already closed. In this way, charging efficiency is increased to improve output performance, further combustion efficiency can be improved because a mixture from the port 9 is supplied at the leading side of the chamber 5b. While interference with a main air supply port can be prevented only by a setting position of the supercharge port.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a supercharging device for a rotary piston engine that supplies pressurized air or a pressurized mixture into a working chamber in addition to naturally aspirated air during the intake stroke.

Generally, the technical concept of increasing the charging efficiency and improving the output performance of the engine by pressurizing and inhaling all of the intake air by a supercharger during the intake stroke of the engine is well known.

However, in such a case, the supercharger will inevitably become larger and I2 will increase. Therefore, in the past, an intake port for supercharging was provided in addition to the main intake port that sucked the air-fuel mixture using the engine's intake negative pressure, and a relatively small-capacity supercharger was connected to this supercharging port. A supercharging device has also been proposed.

However, if the main intake port and supercharging port are separated as in the case of , interference such as intake air blowback will occur between the two ports, making it impossible to obtain a sufficient supercharging effect, or the intake from the main intake port may not flow smoothly. o
-2- Problems also arose.

The problem of interference between the main intake port and the supercharging port as described above naturally occurs in rotary piston engines as well, and Japanese Patent Application No. 55-66616 discloses a solution to the problem of interference between each port. A supercharging device for a rotary piston engine is disclosed.

The supercharging device disclosed in Japanese Patent Application No. 55-66616 is equipped with a timing valve that opens and closes the supercharging passage in synchronization with the eccentric shaft of the rotary piston engine. This is to open the supply passage.

By controlling the opening timing of the supercharging passage with the timing valve, the supercharging device reliably eliminates the interference of intake air between the main intake port and the supercharging port as described above. However, on the other hand, the provision of the timing valve complicates the device, and there is a power loss for driving the timing valve, which is not very desirable.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a supercharging device for a rotary piston engine that can control the opening/closing timing of an independent supercharging port without using a timing valve as described above. It is something to do.

The supercharging device for a rotary piston engine of the present invention is a rotary piston engine as described above, in which a polygonal rotor is inserted into a casing consisting of a rotor housing having a trochoidal inner peripheral surface and side housings arranged on both sides of the rotor housing. In a rotary piston engine in which the piston carries out each stroke of intake, compression, explosion, expansion, and exhaust through planetary rotation while its top side is in sliding contact with the inner circumferential surface of the trochoid, a side housing is provided with natural intake air. In addition to the first intake port, a second intake port is connected to the supercharging means and becomes a supercharging port, and is located at a position that is closed after the first intake port is closed by the rotor and before ignition. It is.

If the second intake port is arranged as described above and the opening/closing timing of the second intake port is controlled by the rotor, the above-mentioned timing valve is, of course, unnecessary.

Embodiments of the present invention will be described below with reference to the drawings. The figure schematically shows an intake system for a rotary piston engine according to an embodiment of the present invention. Inside the casing 3, which is composed of a rotor housing 1 having a trochoidal inner circumferential surface 1a and a pair of side housings 2 (only one side housing 2 is shown in the figure) arranged on both sides of the rotor housing 1, a top portion is arranged along the trochoidal inner circumference. A triangular rotor 4 is disposed so as to rotate planetarily within the casing 3 while slidingly contacting the surface 1a, and a variable volume working chamber 5a is provided between the rotor 4 and the inner peripheral surface 1a of the rotor housing 1. 5b and 5c are formed. A first intake port 6 is opened on the inner surface of the side housing 2 and is opened and closed at a predetermined timing with respect to the intake working chamber 5a by the rotor 4 during the intake stroke. An ignition plug 7 is provided to ignite the air-fuel mixture in the compression working chamber 5b near the top dead center, and an exhaust port 8 is provided on the other side to discharge the exhaust gas from the exhaust working chamber 5c. It makes up a piston engine.

Further, a second intake port 9 is provided on the inner surface of the side housing 2 at a position away from the first intake port 6. This second intake port 9 is provided at a position where it closes after the first intake port 6 is closed by the rotor 4 and before the ignition plug 7 ignites.

The first intake port 6 is connected to a supercharging passage 12 that is branched on the downstream side of the air flow meter 10 . This supercharging passage 12 is provided with a supercharger 13 composed of an air pump driven by the engine. The suction side and the discharge side of this supercharger 13 are connected by a bypass passage [5] equipped with an intake bypass valve 14 that opens when the discharge side pressure exceeds a predetermined value, so as to prevent the supercharging pressure from exceeding a predetermined value. It has become. Also, supercharging passage 1
2 is provided with a check valve 16 for preventing backflow of intake air, and an injector 17 for injecting fuel is provided at a position close to the second intake port 9. This injector 17 is controlled by a computer 18 that receives the output of the air flow meter 1o, and injects an amount of fuel according to the amount of intake air.

The operation of the supercharging device of this embodiment having the above structure will be explained below.

Air is supplied to the intake passage 11 through an air cleaner or the like (not shown). This intake air is supplied from the first intake port 6 to the intake working chamber 5a. Rotor 4 is indicated by arrow A in the diagram.
When the first intake port 6 is closed by the rotor 4 (that is, the intake working chamber 5a becomes the compression working chamber 51), and the rotor 4 further rotates to the position indicated by the solid line in the figure, That is, when the first intake port 6 is closed by the rotor 4, the second intake port 9, which is set at the position described above, is opened. Therefore, intake air pressurized by the supercharger 13 through the intake passage 11 and supercharging passage 12 is mixed with fuel injected from the injector 17 and supplied to the compression working chamber 5b. When the rotor 4 is further rotated and positioned near the compression top dead center (the position indicated by the one-dot chain line in the figure), the spark plug 7 is ignited and the compressed air-fuel mixture is ignited. The two intake ports 9 are already closed by the rotor 4 and are followed by normal explosion, expansion and exhaust.

After air is taken in from the first intake port 6 as described above,
By supercharging the working chamber where compression is taking place from the second intake port 9, the filling efficiency of the engine can be increased and the output performance can be reliably improved. Since the air-fuel mixture is supplied from the second intake port 9 provided in the second intake port 9 to the leading side of the compression working chamber 5b, sufficient combustion occurs on the leading side in the working chamber at the time of ignition, improving combustion efficiency. This results in improved fuel consumption and reduced generation of harmful unburned phosphorus components such as HC and Co. Furthermore, since air is supplied in a stratified manner, a knocking suppressing effect can also be obtained.

In the above embodiment, the mixture is supplied from the second intake port 9, which serves as the supercharging port, but the mixture is supplied from the first intake port, and only pressurized air is supplied from the second intake port. Even if it is supplied, of course, a supercharging effect can be obtained and an improvement in output performance can be realized. Of course, a common fuel supply device may be provided in the intake passage 11 to supply the air-fuel mixture from both the first and second intake ports 6.9.

However, in the above embodiment in which the air-fuel mixture is supplied only from the 28th intake port 9,
As mentioned above, this is extremely effective in increasing the leading-side combustibility within the working chamber.

In addition, if the air-fuel mixture is supplied from the first intake port 6 and supercharging is performed only in the high speed range of the engine, the supercharger 1
In addition to the above-mentioned devices, a turbo supercharger or the like driven by exhaust energy can also be used as the device 3.

Furthermore, the second intake port may be provided in both side housings, and can of course be formed in a multi-cylinder rotary piston engine.

As explained in detail above, the rotary piston engine supercharging device of the present invention reliably prevents interference between the supercharging port and the main intake port by simply selecting the setting position of the supercharging port without using a timing pulp device. It has a completely simple structure, and there is no power loss due to timing valve drive.
Its practical value is extremely high.

[Brief explanation of the drawing]

The figure is a schematic diagram showing one embodiment of the invention. 1... Rotor housing 2... Zydnousing 3... Casing 4...
... Rotor 5a, 5b, 5c... Working chamber
6...First intake boat 9...Second intake port 12.
...Supercharging passage 13...Supercharger 11-

Claims (1)

[Claims] A polygonal rotor slides its top side onto the trochoid inner circumferential surface in a casing consisting of a rotano housing having a trochoid inner circumferential surface and cytono housings arranged on both sides of the rotano housing. In a rotary piston engine that performs each stroke of intake, compression, explosion, expansion, and exhaust through planetary rotation, a second intake port is provided in the site nozzle in addition to the first intake port that performs natural intake. , this second intake port is connected to the first intake port by the rotor.
A supercharging device for a rotary piston engine, which is provided with a supercharging means that opens after the intake boat is closed and is placed in a closed position before ignition, and supplies pressurized air from the second intake boat. -1-1c