JPH0564466U - Fuel injection device for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the startability of an internal combustion engine [Configuration] An internal combustion engine body 11 has three intake ports 13, 14 and 15 set at a predetermined slant angle, and the intake port 13 , 14 and 15 for injecting fuel, and a fuel injection device for an internal combustion engine in which a spark plug is mounted in the vicinity of the central intake port 14 on the side opposite to the injector 31 Is injected toward the inner wall of the intake port 14 on the injector 31 side to be supplied to the fuel chamber along the inner wall of the intake port 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel injection device for an internal combustion engine.

[0002]

[Prior Art]

 5 and 6 show a conventional internal combustion engine.

As shown in FIGS. 5 and 6, the internal combustion engine body 11 is provided with a plurality of combustion chambers 12. Each combustion chamber 12 has three intake ports 13, 14, 15 and two exhaust ports 1. 6 and 17 are formed. A piston 18 is reciprocally attached to the combustion chamber 12 by rotationally driving a crankshaft (not shown). On the other hand, an intake valve 19 is arranged in each of the intake ports 13, 14, 15 and an exhaust valve 20 is arranged in each of the exhaust ports 16, 17 so as to be openable and closable so that they can be driven by respective cranks 21, 22. It has become.

A fuel injector 23 for injecting fuel to each intake port 13, 14, 15 is attached to the internal combustion engine body 11. Further, an ignition plug 24 is attached to the center of each port 13, 14, 15, 16, 17 in the internal combustion engine 11.

In such an internal combustion engine, when each intake valve 19 is opened and intake air is supplied from each intake port 13, 14, 15 into the combustion chamber 12, at the same time, an appropriate amount of intake air is supplied. Fuel is injected from the fuel injector 23. Then, it is ignited by the spark plug 24 and burns in the combustion chamber 12.

[0006]

[Problems to be solved by the device]

 The internal combustion engine of the vehicle, that is, the engine is arranged at the front portion in a passenger car, but is usually arranged below a seat in a one-box type vehicle. In this case, the height of the engine is not so much limited in the front part of the vehicle, and the engine can be installed upright. However, placing the engine below the seat limits the height of the vehicle. Therefore, the engine must be tilted.

FIG. 7 shows a cross section of a main part when the internal combustion engine is tilted by a predetermined angle.

As shown in FIG. 7, the internal combustion engine body 11 is tilted to set the slant angle to θ. In this case, the fuel is injected from the fuel injector 23 toward the tip of the spark plug 24.

However, in the conventional internal combustion engine arranged as described above, the injected fuel is not directly atomized around the tip of the fuel injector 23. That is, it once adheres to the inner walls of the intake ports 13, 14, 15 and travels along the inner walls to wet the tip of the ignition plug 24. Therefore, it is good to start the internal combustion engine at room temperature, but if the internal combustion engine is started at a low temperature of more than -20 ° C, the vaporized state of the fuel is not good, and there is a problem that it does not start well. It was

The present invention solves such problems, and an object of the present invention is to provide a fuel injection device for an internal combustion engine, which improves the startability of the internal combustion engine.

[0011]

[Means for Solving the Problems]

 A fuel injection device for an internal combustion engine according to the present invention for achieving the above object has an internal combustion engine main body set at a predetermined slant angle and has three intake ports and intake valves. In a fuel injection device for an internal combustion engine in which an injector for injecting is disposed and a spark plug is disposed in the vicinity of the central intake port on the side opposite to the injector, fuel is injected into the intake port. It is characterized in that the injector is positioned so as to be injected toward the inner wall on the injector side.

[0012]

[Action]

 By injecting the fuel toward the injector-side inner wall of the intake port, the injected fuel is supplied to the combustion chamber along the inner wall of the intake port and does not directly wet the tip of the spark plug. It is possible to reliably start the internal combustion engine even at low temperatures where vaporization is not good.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 schematically show a fuel injection device for an internal combustion engine according to an embodiment of the present invention. It should be noted that members having the same functions as those of the related art are designated by the same reference numerals, and redundant description will be omitted.

As shown in FIGS. 1 and 2, the internal combustion engine is mounted on a vehicle with a slant angle θ inclined with respect to a vertical line O in the vertical direction. In this embodiment, the slant angle θ is 60 degrees.

In the fuel injection device of the present embodiment, three intake ports 13, 14, 15 are formed in the internal combustion engine body 11, and three intake ports 13, 14, 15 are used to inject fuel into each intake port 13, 14, 15. A fuel injector 31 having two injection holes is attached. A spark plug 24 is attached near the intake port 14 and on the opposite side of the fuel injector 31. Therefore, the fuel injector 31, the intake port 14, and the spark plug 24 are positioned so as to be substantially aligned.

The fuel injector 31 is attached so that fuel is injected toward the inner wall of the intake port 14 on the fuel injector 31 side. That is, in the fuel injector 31, the tip of the axis P intersects with the tip of the spark plug 24, and the fuel injector 31 is not shown so that the fuel is injected in the direction Q deviated from the axis P by the angle α. The injection hole is formed. The shift angle α is 13 degrees in this embodiment. Further, the fuel injection width angle β is 4 degrees in this embodiment.

Thus, in such a fuel injection device for an internal combustion engine, when fuel is injected from the injection hole of the fuel injector 31, the fuel becomes atomized and the inner wall of the intake port 14 on the side of the fuel injector 31 ( It is ejected toward the inclined display portion in FIG. 2). Then, it is supplied to the combustion chamber 12 through the inner wall of the intake port 14. Here, the spark plug 24 ignites and the internal combustion engine is started.

The fuel injected from the fuel injector 31 as described above is supplied to the inside of the combustion chamber 12 through the inner wall of the intake port 14 on the side of the fuel injector 31. The internal combustion engine will start reliably even at low temperatures where the condition is not good.

3 and 4 show a fuel injection device for an internal combustion engine according to another embodiment of the present invention.

The fuel injection devices of the internal combustion engine shown in FIGS. 3 and 4 have different directions of fuel injection from the fuel injector 31.

That is, the injection deviation angle α with respect to the axis line P of the fuel injector is set to 16 degrees in the fuel injector 32 in the fuel injection device for the internal combustion engine shown in FIG. Further, the fuel injector 33 in the fuel injection device for the internal combustion engine shown in FIG. 4 is set to 10 degrees. The injection deviation angle α is appropriately 10 to 16 degrees, but is not limited to this depending on the shape of the intake port.

Further, in the above-mentioned embodiment, the slant angle θ with respect to the vehicle vertical line O is set to 60 degrees in the internal combustion engine, but the invention is not limited to this, and the slantingly set internal combustion engine is described above. The effect of is obtained.

[0024]

[Effect of the device]

 As described above in detail with reference to the embodiments, according to the fuel injection device for an internal combustion engine of the present invention, the injector is arranged so that the fuel is injected toward the injector-side inner wall of the intake port. The injected fuel does not directly wet the tip of the spark plug and is supplied to the combustion chamber through the inner wall of the intake port, so that the internal combustion engine can be reliably started even at low temperatures where vaporization is not good. Therefore, the startability of the internal combustion engine can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a fuel injection device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 shows a fuel injection system for an internal combustion engine, which is different from FIG.
It is a schematic diagram from a different direction.

FIG. 3 is a schematic view of a fuel injection device for an internal combustion engine according to another embodiment of the present invention.

FIG. 4 is a schematic view of a fuel injection device for an internal combustion engine according to another embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a conventional internal combustion engine.

FIG. 6 is a plan view of a conventional internal combustion engine.

FIG. 7 is a schematic diagram of a conventional fuel injection device for an internal combustion engine.

[Explanation of symbols]

 11 Internal Combustion Engine Body 12 Combustion Chamber 13, 14, 15 Intake Port 24 Spark Plug 31, 32, 33 Fuel Injector

Claims (1)

[Scope of utility model registration request] 1. An internal combustion engine body is set to a predetermined slant angle, has three intake ports and an intake valve, and an injector for injecting fuel is arranged in each of the intake ports and in the vicinity of the central intake port. In the fuel injection device for the internal combustion engine, in which the spark plug is disposed on the side opposite to the injector, the injector is positioned so that fuel is injected toward the injector-side inner wall of the intake port. A fuel injection device for an internal combustion engine, comprising: