JP2747553B2 - Fuel injection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fuel injection device for an engine having a combustion chamber in which at least three intake valves are arranged in one cylinder.

(Prior Art) As a conventional general fuel injection device for a gasoline engine, as described in Japanese Utility Model Laid-Open Publication No. 61-149772, two intake valves are provided for each cylinder. On the other hand, a fuel injection valve that injects fuel in two directions is known.

This conventional device will be described with reference to FIGS. 5 and 6, (1) is an electromagnetic fuel injection valve,
(2) a fuel injection hole whose opening and closing is controlled by a ball (3); (4) an adapter having injection fuel passages (5a) and (5b) formed in connection with the fuel injection hole; The opening angles of (5a) and (5b) are set to (α).
(6a) and (6b) are injection ports as injection fuel path outlets,
(7) is an intake pipe in which the fuel injection valve (1) is mounted,
(8) is an intake passage formed in the intake pipe, (9) is a cylinder of the engine, (10) is a combustion chamber of a cylinder connected to the intake passage (8), and (11a) and (11b) are An intake valve mounted on the intake passage side of this combustion chamber,
Open and close each intake port. (12a) and (12b) are exhaust valves provided on the side of the combustion chamber opposite to the intake valve, and open and close each exhaust port. (13) The above intake passages (8)
(14) is a spark plug installed at the center of the combustion chamber (10).

In such a configuration, two intake valves (11) are formed at an angle α from the ejection port of the fuel injection valve (1).
a) Injecting in two directions to (11b).

(Problem to be Solved by the Invention) In the above-described conventional fuel injection valve (1) of an engine having a combustion chamber (10) provided with two intake valves (11a) and (11b) per cylinder, One intake valve (11a) (1
1b) injects fuel from two directions from the fuel injection valve (1). Conventionally, it is not common to inject fuel into each of three intake valves with one fuel injection valve. .

Further, it is conceivable to supply fuel to each of the three intake valves by injecting the fuel into each of the three intake valves by using one fuel injection valve in each of the three directions. It is necessary to form three fuel injection valves and to inject fuel into each of the intake valves at an optimal angle, which makes machining difficult, and it is very difficult to set the injection angle so that fuel is optimally injected into each of the intake valves. Was difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel injection device that can reduce processing costs and can obtain performance in a range that does not cause a practical problem.

(Means for Solving the Problems) The present invention relates to a fuel injection device for an engine having a combustion chamber in which at least three intake valves are arranged in one cylinder.
A fuel injection valve having a plurality of injection directions less than the number of intake valves is provided on a line connecting the center of the combustion chamber and the arrangement center of the at least three intake valves, and the plurality of injection directions are adjusted to the respective intake air directions. The fuels injected into the valves are set so as to be equal.

(Operation) In the present invention, an equal amount of fuel can be injected into each intake valve by fuel injection in a plurality of directions smaller than the number of intake valves.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First,
1 and 2, reference numeral (15) denotes a fuel injection valve mounted on the intake pipe (7), and has two injection ports (16a) and (16b) formed to be inclined at a predetermined angle. (17a) (17b)
(17c) is three intake valves arranged at equal intervals on the side of the intake passage (8) in the combustion chamber (10), and opens and closes three intake ports respectively. (18a) and (18b) are intake valves (17
The ignition plug (14) is attached to the center (B) of the combustion chamber (10) by partition walls provided on both sides of b). The three intake valves (17a), (17b) and (17c) are the central intake valve (17b)
The other two intake valves (17a) and (17c) are provided symmetrically with respect to.

The fuel injection valve (15) is connected to the center (B) of the combustion chamber (10)
It is provided on the line (A) connecting to the arrangement center of the two intake valves (17a) (17b) (17c).

In the case of the embodiment configured as above,
Fuel is injected from the injection ports (16a) (16b) of the fuel injection valve (15) to the intake valves (17a) (17b) (17c) by two-way injection. In this case, the fuel injection angle from each injection port (16a) (16b) is (β), and each intake valve (17a) (17b) (17
In c), each partition (18a) (18b) is branched into equal amounts.

The fuel injection angle (β) and the mounting position of the fuel injection valve (15) are set so that the fuel injected from the fuel injection valve (15) does not adhere to the inner wall of the intake pipe (7). Therefore, the fuel injected from the fuel injection valve (15) is reliably injected into the intake valves (17a), (17b), (17c), so that optimal combustion of the engine can be ensured.

In the above description, three intake valves (17a) and (17b) are provided for one cylinder.
In the fuel injection valve (15) of the engine having the combustion chamber (10) in which the (17c) is disposed, the fuel is supplied to the intake valves (17a), (17b), and (17c) by the two-way injection so as to have the same amount. Although the injection type is exemplified, the invention can also be applied to an engine having four intake valves and three exhaust valves in one cylinder. That is,
Another embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 and 4, reference numeral (19) denotes a fuel injection valve mounted on the intake pipe (7), which is formed to be inclined at a predetermined angle.
It has two spouts (20a) (20b). (21a) (21b)
(21c) and (21d) are four intake valves disposed at equal intervals on the intake passage (8) side of the combustion chamber (10), respectively.
Each opens and closes four intake ports. (22a) (22b) (22
c) three exhaust valves arranged at equal intervals on the opposite side of the intake passage (8) in the combustion chamber (10) to open and close three exhaust ports respectively. (23a), (23b), and (23c) are partition walls that branch the respective intake valves. The spark plug (14) is mounted at the center (B) of the combustion chamber (10). Further, the fuel injection valve (19) is on a line (A) connecting the center (B) of the combustion chamber (10) and the arrangement center of the four intake valves (21a) (21b) (21c) (21d). Is provided.

Even in the other embodiment configured as described above, the intake valves (21a), (21b), (21c), and (21c) (two-way injection) from the injection ports (20a) and (20b) of the fuel injection valve (19). At the injection angle (γ) of 21d), injection is performed through the partition walls (23a), (23b), and (23c) so as to be equal in amount. Also in this embodiment, the fuel injection angle (γ) and the mounting position of the fuel injection valve (19) are set so that the fuel injected from the fuel injection valve (19) does not adhere to the inner wall of the intake pipe (7). Is set.

(Effects of the Invention) As described above, according to the present invention, in a fuel injection device for an engine having a combustion chamber in which at least three intake valves are arranged in one cylinder, a fuel injection valve having a plurality of injection directions smaller than the number of intake valves is provided. Is provided on a line connecting the center of the combustion chamber and the arrangement center of at least three intake valves, and the plurality of injection directions of the fuel injection valves are set so that the amount of fuel injected into each intake valve is equal. As a result, fuel can be reliably injected into at least three intake valves in a plurality of injection directions smaller than the number of intake valves, so that machining cost can be reduced and performance in a range where there is no practical problem can be obtained. effective.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a front view of a tip portion of a fuel injection valve in the embodiment shown in FIG. 1,
FIG. 3 is a plan view showing another embodiment of the present invention, FIG. 4 is a front view of the tip of the fuel injection valve in the embodiment shown in FIG. 3, and FIG. FIG. 5 (b) is a front view of the tip of the fuel injection valve in the conventional device, and FIG. 6 is a plan view showing the conventional device. In the figure, (1), (15) and (19) are fuel injection valves, (7) is an intake pipe, (8) is an intake passage, (9) is a cylinder, (10) is a combustion chamber, (12a) and (12b). (22a) (22b) (22c) is an exhaust valve, (14) is a point plug, (16a) (16b) (20a) (20b)
Is the spout, (17a) (17b) (17c) (21a) (21b) (21
c) (21d) is the intake valve, (18a) (18b) (23a) (23b)
(23c) is a partition. The same reference numerals in the drawings indicate the same or corresponding parts.

Continuation of the front page (56) References JP-A-63-154859 (JP, A) JP-A 1-139078 (JP, U) JP-A 62-90937 (JP, U) JP-A 61-186765 (JP) , U) Actually open sho 59-123660 (JP, U)

Claims (1)

(57) [Claims] 1. A fuel injection device for an engine having a combustion chamber in which at least three intake valves are disposed in one cylinder, wherein a fuel injection valve having a plurality of injection directions smaller than the number of intake valves is provided at a center of the combustion chamber. And a plurality of injection directions are set so that the fuel injected into each of the intake valves is equal in quantity. apparatus.