JPH04308321A - Fuel injection device of rotary piston engine - Google Patents

Abstract

PURPOSE:To enable stratification of air-mixture in the vicinity of an ignition means even if any large vortex may take plate in the same direction as the rotor rotational direction inside an operation chamber. CONSTITUTION:A fuel injection means 16 which directly injects fuel 17 into an operation chamber 6 and an ignition means 14 which ignites the fuel 17 are provided, and the fuel injection direction of the fuel injection means 16 is set to face the position on the delay side from the ignition means 14.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection system for a rotary piston engine.

0002

[Prior Art] Rotary piston engines generally have
As shown in Japanese Unexamined Patent Publication No. 63-80020, after fuel is directly injected into the working chamber from a fuel injection means, the fuel is ignited by an ignition means. By the way, conventionally, in the rotary piston engine as described above, as shown in FIG.
Fuel 117 is injected toward the surface. This is because the flow in the working chamber 106 is uniform as the rotor 104 rotates, and as described above, if fuel is injected to the advancing side of the working chamber 106, the flow is maintained as it is and the ignition means This is because it was thought that the mixture could be made rich (stratified) only in the vicinity of the ignition means, thereby increasing the combustion efficiency, especially in low negative conditions. However, recently, as a result of research on the flow in the working chamber 106, the present inventor found that during the compression stroke, as the rotor 104 rotates, a large vortex T forms in the rotational direction of the rotor 104 (in FIG. 7). , clockwise),
It has been found that the large vortex T flows from the leading side to the lagging side on the surface of the rotor 104. For this reason,
In the rotary piston engine as described above, the fuel 117 adheres to the surface of the rotor 104 and vaporizes slowly, so the fuel 117 flows into the working chamber 10 due to the flow of a large vortex T.
Therefore, at the time of ignition, it becomes difficult to stratify the air-fuel mixture near the ignition means.

0003

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent the air-fuel mixture near the ignition means even if a large vortex flow occurs in the working chamber in the same direction as the rotor rotation direction. The objective is to enable layering of the materials.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a rotary piston engine equipped with fuel injection means for directly injecting fuel into the working chamber, and ignition means for igniting the fuel. In this configuration, the fuel injection direction of the fuel injection means is set to a position on the lag side relative to the ignition means. With the above configuration, the fuel from the fuel injection means adheres to the housing on the lag side than the ignition means, and the fuel vaporized from there rides on the large vortex generated during the compression stroke. On the housing side, the flow direction of the fuel is in the rotor rotational direction along the housing, so that the fuel rides on a large vortex and is carried to the ignition means. Therefore, even if a large vortex occurs in the working chamber, stratification can occur near the ignition means.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is a casing of a rotary piston engine, and the casing is composed of a rotor housing 2 having a trochoidal inner circumferential surface 2a, and side housings 3 disposed on both sides of the rotor housing 2. As shown in FIG. 1, a substantially triangular rotor 4 is disposed within the casing 1 and supported by an eccentric shaft 5. As shown in FIG. The rotor 4 defines three working chambers 6 in the casing 1, and as the rotor 4 rotates, intake, compression,
The explosion, expansion, and exhaust strokes are performed in sequence. In addition, the rotor 4 includes an apex seal 7,
Side seals 8 and corner seals 9 are attached. The casing 1 is provided with an intake port 10 that passes through the side housing 3 and opens into the working chamber 6 for the intake stroke, and an exhaust port 11 that passes through the rotor housing 2 and opens into the working chamber 6 for the exhaust stroke. . Above intake port 1
An intake passage 12 is connected to the port 0, and an exhaust passage 13 is connected to the exhaust port 11.

As shown in FIG. 1, the rotor housing 2 is provided with a spark plug 14 as an ignition means and a fuel injection valve 16 as a fuel injection means. Two spark plugs 14 are provided in this embodiment, and both spark plugs 14 are arranged side by side on the side opposite to the intake port 10 with the trochoid long axis of the rotor housing 2 as a reference, and each of the spark plugs 14 is arranged side by side on the side opposite to the intake port 10, The ignition part of the plug 14 faces into the working chamber 6. The fuel injection valve 16 is connected to the intake port 1 with the trochoid long axis of the rotor housing 2 as a reference.
It is attached to the rotor housing 2 with a larger mounting angle on the 0 side, and the fuel 17 of the fuel injector 16 is
As shown in FIG. 1, the injection direction is set so that the fuel is attached to the rotor housing 2 on the lag side (upper side in FIG. 1) than the spark plug 14.

Therefore, in the above device, when the fuel 17 is injected from the fuel injection valve 16, the fuel 17 is
The rotor housing 2 on the lag side of the spark plug 14
It will adhere to. Therefore, even if a large vortex T is generated during the compression stroke as shown in FIG. 7, the vortex T will move clockwise in FIG. As a result, the fuel vaporized from the rotor housing 2 rides on the flow of the large vortex T and is carried to the spark plug 14 side, allowing the mixture to be enriched only in the vicinity of the spark plug 14 (stratification). It turns out. This makes it possible to reduce pumping loss and increase combustion efficiency, especially during low loads. Moreover, since the large vortex T flows along the rotor housing inner circumferential surface 2a, vaporization of the fuel adhering to the rotor housing 2 is promoted by the flow of the large vortex. Furthermore, in this embodiment, the fuel injection valve 16 is disposed near the intake port 10, and the distance through which the injected fuel 17 passes through the working chamber 6 is long, so that it is well mixed with air on the way. This results in better vaporization and mixing.

In this embodiment, the fuel injection valve 16 is provided in the rotor housing 2, but it may also be provided in the side housing 3. As a result, compared to the case where the injection port of the fuel injection valve 16 is provided in the rotor housing 2, there is no need to consider gas blow-through when passing the apex seal 7.
This results in a degree of freedom in the mounting position.

FIGS. 2 to 5 show a visualized rotary piston engine used in research to complete the present invention. In this rotary piston engine, the same components as those in the embodiment described above are given the same reference numerals, and the explanation thereof will be omitted. In this rotary piston engine,
One side housing 3 is a front housing 3a, and the other side housing 3 is a rear housing 3b.
It is said that A spacer 20 is interposed between the front housing 3a and the rotor housing 2,
As shown in FIG. 4, the spacer 20, the front housing 3a, and the rotor housing 2 form an annular groove 21 therein. An observation window glass 22 is fitted into this annular groove 21 at its peripheral edge, and between the observation window glass 22 and each housing 3a(2), there is a
A TFE (polytetrafluoroethylene) sheet (so-called Teflon sheet) 23 is interposed. This PTF
Based on its properties, the E-sheet 23 functions as a buffer material and also ensures gas sealing properties. on the other hand,
The inner surface of the rear housing 3b is plated with hard chrome and polished to form a mirror-finished portion 24. Here, hard chrome plating was used because
This is because it was necessary to ensure adhesion to the base material, wear resistance, and sufficient reflectance. In FIG. 5, the shaded area is the hard chrome plated area (mirrored area) 24. This makes it possible to visualize the mixture formation process and dilution gas distribution, which cannot be captured by direct imaging, which has been considered difficult until now.

0010

As described above, the present invention makes it possible to stratify the air-fuel mixture near the ignition means even if a large vortex flow occurs in the working chamber in the same direction as the rotational direction of the rotor.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram illustrating an embodiment of the present invention.

FIG. 2 is a front view showing a visualized rotary piston engine.

FIG. 3 is a longitudinal cross-sectional view of FIG. 2;

FIG. 4 is a partially enlarged view of FIG. 3;

FIG. 5 is a diagram showing a mirrored portion on the inner surface of the rear housing.

FIG. 6 is an explanatory diagram illustrating fuel injection in a conventional rotary piston engine.

7 is an explanatory diagram illustrating the state of the working chamber during a compression stroke in the rotary piston engine of FIG. 6. FIG.

[Explanation of symbols]

6 Working chamber 14 Spark plug 16 Fuel injection valve 17 Fuel

Claims (1)

[Claims] 1. A rotary piston engine comprising a fuel injection means for directly injecting fuel into a working chamber and an ignition means for igniting the fuel, wherein the fuel injection direction of the fuel injection means lags behind that of the ignition means. A fuel injection device for a rotary piston engine, characterized in that the fuel injection device is set to face the position.