JPH0251048B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an intake system for a multi-cylinder rotary piston engine.

In a rotary piston engine, a polygonal rotor rotates planetarily in a casing consisting of a rotor housing with a trochoidal inner peripheral surface and side housings located on both sides of the rotor housing. The flame propagates at a very high speed toward the leading side in the forward direction of rotation of the rotor due to the flow of air-fuel mixture accompanying the rotation of the rotor, but is difficult to propagate to the trailing side in the rear direction of rotation. For this reason, while the air-fuel mixture in the combustion chamber burns well on the leading side, incomplete combustion occurs on the trailing side, resulting in poor combustion efficiency, high fuel consumption, and the production of HC, CO, etc. There is also a problem in that the amount of harmful unburned components emitted is large.

In order to solve this problem, a structure in which the air-fuel mixture is enriched on the leading side where the air-fuel mixture is more likely to burn was proposed in Utility Model Application No. 19109-1983. In this system, fuel is injected from a fuel injection nozzle placed toward the leading side of the compression chamber, but this configuration requires a separate fuel injection timing device and also controls the injection pressure depending on the load. This also requires a device to do this, which complicates the structure, and also has the disadvantage that the injected fuel and air are not sufficiently mixed.

The present invention has been made to solve these conventional drawbacks, and provides an intake system that does not require a complicated timing device or the like in the fuel injection means and can provide sufficient stratified air supply.

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 4, 1 and 1' are rotor housings having a trochoidal inner peripheral surface, and side housings 3 and 30 having flat inner surfaces are located on both sides of the rotor housing, and the housing formed by these A triangular rotor 2 is arranged inside,
An apex seal provided at the top of the rotor 2 contacts the inner circumferential surface 11 of the rotor housing 1, thereby forming a space between the rotor 2 and the rotor housing 1. This embodiment shows a two-cylinder engine in which the rotor housing 1 is arranged on both sides of the side housing 3.

A spark plug 19 is provided on one side of the rotor housing 1 so that a combustion chamber is formed therein, and an exhaust port 18 is formed on the other side of the rotor housing 1. The side housing 3 has an intake port 5 that opens into the housing.
An intake passage 7 is connected to the intake port 5, and an air flow meter 10 is connected to the intake passage 7.
is provided. From the intake port 5, only single air or a lean mixture is supplied. Further, a communication port 4 is formed in the side housing 3, and a communication path 6 is connected to the communication port 4. This communication port 4
is the leading side of the compression chamber, and is opened by the rotor 2 in the vicinity where the rotor 2 closes the intake port 5, and the rotor 2 is opened before the spark plug 19 ignites.
is placed in the closed position. Although only one housing is shown in FIGS. 1 to 3, the other housing has a similar construction, and the communication ports 4 of both housings communicate with each other through a communication path 6. In addition, the rotor 2 shown by the solid line is attached to one housing, and the rotor 2 shown by the dotted line
a are respectively provided in the other housing, and are configured to rotate with a phase angle of 180 degrees with respect to each other. An injector 8 is provided in the communication path 6, and fuel is injected from the injector 8 by a computer 80 according to the air flow rate detected by an air flow meter 10.

In the above configuration, in the state shown in FIG.
closes the intake port 5 and the communication port 4, and the rotor 2a in the other housing opens the communication port 4. Therefore, the air-fuel mixture in the communication passage 6 is fed only into the other housing, and the air-fuel mixture is fed into the leading side of the compression chamber formed by the rotor 2a. Then, as the rotation of the rotors 2 and 2a progresses,
As shown in FIG. 2, the rotor 2 begins to open the communication port 4, and the rotor 2a in the other housing begins to close the communication port 4. In this state, both compression chambers communicate with each other through the communication port 4 and the communication path 6, but the compression chamber formed by the rotor 2 has a lower pressure than the compression chamber formed by the rotor 2a, so they communicate with each other. The mixed gas in the passage 6 becomes supplied to the compression chamber formed by the rotor 2. Therefore, the air-fuel mixture is supplied to the compression chamber formed by the rotor 2a when the communication port 4 is located on the leading side, and is no longer supplied as the communication port 4 moves in the trailing direction. As the rotor rotates further, as shown in Fig. 3, the rotor 2a closes the communication port 4, and at the same time, the spark plug of this cylinder ignites, and the rotor 2 fully opens the communication port 4. . The fuel injected from the injector 8 in this manner is sufficiently mixed with air within the communication passage 6, and is supplied into the compression chamber as an air-fuel mixture. As a result, combustion on the leading side of the combustion chamber is sufficiently carried out, improving the combustion efficiency of the entire combustion chamber, reducing fuel consumption and reducing emissions of harmful unburned components such as HC and CO. Moreover, stratified air supply also serves to prevent knocking.

Note that the communication port 4 does not necessarily have to be opened on both sides from one side housing;
As shown in the figure, they may be formed in separate side housings. Furthermore, the present invention can be similarly applied to engines with three or more cylinders.

As explained above, the present invention provides a multi-cylinder rotary piston engine in which the compression chambers are communicated with each other, a fuel supply means is provided in the communication passage, and the communication port is opened only on the leading side of the compression chamber, thereby forming a layered structure. It is designed to supply air, has a simple structure, and has excellent combustion efficiency.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic cross-sectional views showing an embodiment of the present invention, showing the state in which the rotor is rotating sequentially, Figure 4 is a plan view thereof, and Figure 5 is another embodiment. FIG. 1... Rotor housing, 2, 2a... Rotor, 4... Communication port, 5... Intake port, 6... Communication path, 8... Injector.

Claims (1)

[Claims] 1. In a multi-cylinder rotary piston engine in which a polygonal rotor rotates planetarily in a casing consisting of a rotor housing having a trochoidal inner circumferential surface and side housings located on both sides of the rotor housing, air is taken into the intake chamber of the casing. A port is provided, and a communication port is provided in the side housing of adjacent cylinders, and each cylinder is opened by the rotor on the leading side of the compression chamber near where the rotor closes the intake port, and before the engine in that cylinder is ignited. A multi-cylinder rotary piston engine characterized in that the communication port is opened at a position closed by the rotor of the cylinder, a communication path is provided for communicating the communication ports with each other, and a fuel supply means is provided in the communication path. Intake device.