JPH0415944Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an intake installation for an internal combustion engine.

[Conventional technology]

A bypass passage is branched from the inlet of the helical intake port, this bypass passage is connected to the spiral end of the intake port spiral part, and an on-off valve that opens when the amount of intake air increases is arranged in the bypass passage. An internal combustion engine in which a fuel injection valve is disposed at the entrance of an intake port is known (see Japanese Patent Laid-Open No. 58-23223).

In addition, a partition wall is formed in the intake port that hangs downward from the upper wall surface of the intake port and extends from the intake valve stem toward the upstream side of the intake port along the intake port axis, and a helical passage and a bypass passage are provided on both sides of the partition wall. An internal combustion engine is known in which an on-off valve that opens during high-load engine operation is arranged in a bypass passage. (Refer to Japanese Patent Application Laid-open No. 58-23224).

In these internal combustion engines, a strong swirling flow is generated in the combustion chamber by closing the on-off valve when the amount of intake air is small or when the engine is operating at low to medium load.
By opening the on-off valve when the amount of intake air increases or when the engine is operating under high load, the bypass passage is enabled to flow, thereby increasing the filling efficiency.

[Problem that the invention attempts to solve]

However, in the above-mentioned internal combustion engine, the flow area of the bypass passage is limited, and therefore, even if the bypass passage is allowed to flow during high-load operation of the engine, there is a problem that a sufficiently high charging efficiency cannot be obtained.

[Means for solving problems]

In order to solve the above problems, according to the present invention, a common intake passage is provided for the first intake valve and the second intake valve that are arranged in parallel with each other, and the intake passage is opened between the first intake valve and the second intake valve. A separation wall extending in the upstream direction separates the intake passage into the first intake passage and the second intake passage.
It is separated into intake passages, hangs downward from the upper wall surface of the intake passage, and extends from around the stem of the first intake valve along the axis of the first intake passage, beyond the upstream end of the separation wall, to the center of the common intake passage. A partition wall extending in the upstream direction of the intake passage is formed in the intake passage, and an intake control valve that opens during high engine load operation is arranged between the common intake passage side wall surface on the second intake passage side and the upstream end of the partition wall, A fuel injection valve is disposed in a common intake passage upstream of the partition wall, and the fuel injection valve has three injection holes oriented respectively in the first intake passage and the second intake passage on both sides of the partition wall.

〔Example〕

Referring to FIGS. 1 to 3, 1 is a combustion chamber;
Reference numeral 2 indicates a first intake valve, 3 indicates a second intake valve, and 4 indicates an intake passage common to the first intake valve 2 and the second intake valve 3, respectively. A separation wall 5 is formed in the intake passage 4 and extends from between the first intake valve 2 and the second intake valve 3 toward the upstream direction of the intake passage 4.
Accordingly, the intake passage 4 is connected to the first intake passage 6 and the second intake passage 4.
It is separated into an intake passage 7. As shown in FIG. 2, the upstream end 5a of the separation wall 5 extends from the upper wall surface to the lower wall surface of the intake passage 4. As shown in FIG. On the other hand, the first intake passage 6
A partition wall 8 that hangs downward from the upper wall surface of the first intake passage 6 is formed therein. This partition wall 8 extends from around the stem 2a of the first intake valve 2 along the axis of the first intake passage 6, beyond the upstream end 5a of the separation wall 5, to the center of the intake passage 4 in the upstream direction of the intake passage 4. . The lower wall surface 9 of the partition wall 8 is arranged at a distance from the bottom wall surface of the intake passage 4, so that a circulation space for intake air is formed between the lower wall surface 9 of the partition wall 8 and the bottom wall surface of the intake passage 4. . The first intake passage 6 is divided into two passages by the partition wall 8, with a helical passage 6a formed on the side opposite to the separation wall 5, and a bypass passage 6b formed on the side of the separation wall 5, respectively. An intake control valve 10 in the form of a butterfly valve is disposed between the intake passage side wall surface 4a on the second intake passage 7 side and the upstream end of the partition wall 8. This intake control valve 10 is connected to an actuator 12 via a link mechanism 11, and is fully opened by the actuator 12 as shown by the solid line when the engine is operating at a high load, and fully closed as shown by the broken line when the engine is operating at a low to medium load. It will be done. This actuator 12 can therefore be formed from a diaphragm device in which a diaphragm negative pressure chamber is connected into the intake passage 4 . A fuel injection valve 13 is arranged on the upper wall surface of the intake passage 4 upstream of the partition wall 8 . This fuel injection valve 13 has three nozzle holes consisting of a first nozzle hole 14, a second nozzle hole 15, and a third nozzle hole 16, as shown in FIG. The first nozzle hole 15 is oriented toward the helical passage 6a of the first intake passage 6 as shown by arrow A in FIGS. 1 and 2, and is oriented so that the jet axis does not come into contact with the partition wall 8. . Second
The nozzle hole 15 is oriented toward the bypass passage 6b of the first intake passage 6 as shown by arrow B, and is oriented so that the jet axis does not come into contact with the partition wall 8. Further, the third nozzle hole 16 is located at the second nozzle hole 16 as shown by arrow C.
It is directed toward the intake passage 7.

When the engine is operating at a low to medium load, the intake control valve 10 is closed as described above, so that most of the intake air flows into the helical passage 6a. This intake air is supplied to the first intake passage 6a around the intake valve stem 2a.
Since the air flows into the combustion chamber 1 through the first intake valve 2 while swirling along the curved side wall surface of the combustion chamber 1, a strong swirling flow is generated within the combustion chamber 1. At this time, the first nozzle hole 14 and the second nozzle hole 15 of the fuel injection valve 13
The fuel injected from the combustion chamber 1 along with the swirling air flow
The fuel injected from the third nozzle hole 16 collides with the intake control valve 10, and then flows into the helical passage 6a, dragged by the intake air flow toward the helical passage 6a.

On the other hand, when the engine is operated under high load, the intake control valve 10 is fully opened as described above, so that the intake air also flows into the combustion chamber 1 through the second intake passage 7, which has low flow resistance, and as a result, the charging efficiency is increased. . At this time, intake air also flows in from the bypass passage 6b. This intake air enters from the helical passage 6a and collides head-on with the swirling intake air, so that the swirling flow is weakened, and thus the flow path resistance to the intake air flow flowing through the first intake passage 6 is reduced. As a result, the filling efficiency is further improved. Further, at this time, the fuel injected from the first nozzle hole 14 and the second nozzle hole 15 of the fuel injection valve 13 is immediately supplied into the combustion chamber 1 without adhering to the partition wall 8.
Since the fuel injected from the third injection hole 16 is also immediately supplied into the combustion chamber 1, good responsiveness of the engine to the fuel injection action can be ensured.

[Effect of idea]

During high-load engine operation, intake air flows into the combustion chamber from the second intake passage, and the flow resistance of the first intake passage is reduced, so that high charging efficiency can be ensured. Furthermore, since the fuel injection does not adhere to the partition wall, good engine responsiveness can be ensured. In addition, especially during high-load operation, fuel is supplied to all passages into which intake air flows, including the helical passage, bypass passage, and second intake passage, so that a uniform air-fuel mixture is supplied to the combustion chamber, resulting in a good air-fuel mixture. You can get a good combustion.

[Brief explanation of the drawing]

Fig. 1 is a sectional plan view of the intake passage, Fig. 2 is a side sectional view of the intake passage, Fig. 3 is a sectional view taken along the - line in Fig. 1, and Fig. 4 is a sectional view of the tip of the fuel injection valve. FIG. 2...First intake valve, 3...Second intake valve, 4...
Intake passage, 5... Separation wall, 6... First intake passage,
7... Second intake passage, 8... Partition wall, 10... Intake control valve, 13... Fuel injection valve, 14, 15, 16
...Blow hole.

Claims (1)

[Scope of utility model registration request] A common intake passage is provided for the first intake valve and the second intake valve that are arranged in parallel with each other, and the intake passage is defined by a separation wall that extends from between the first intake valve and the second intake valve toward the upstream direction of the intake passage. is separated into a first intake passage and a second intake passage, and hangs downward from the upper wall surface of the intake passage, and extends from around the stem of the first intake valve along the axis of the first intake passage and beyond the upstream end of the separation wall. forming a partition in the intake passage that extends in the upstream direction of the intake passage to the center of the common intake passage;
An intake control valve that opens during high engine load operation is arranged between the common intake passage side wall surface on the second intake passage side and the upstream end of the partition, and a fuel injection valve is arranged in the common intake passage upstream of the partition. An intake installation for an internal combustion engine in which the injection valve has three injection holes oriented respectively in a first intake passage and a second intake passage on both sides of a bulkhead.