JPS58131312A - Suction device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To contrive to improve the combustion quality centering around the range from light load to medium load by a method wherein the swirl produced by means of the primary side suction air is rendered to be strong and at the same time the inflowing speed of the secondary side leak suction air is raised in order to intensify the swirl. CONSTITUTION:During the running in the range from light load to medium load, the primary side suction air is flowed through primary suction passages 26 into combustion chambers 14. Because each primary suction passage 26 has a relatively larger cross-sectional area S1, which satisfies the following relationship with respect to the cross-sectional area S2 of each secondary suction passage: (n-1)S1>S2, a large amount of primary side suction air is carried so as to produce strong swirl in a combustion chamber 14 in combination with a strong primary side swirling part. Furthermore, when the third cylinder 4-3 is in suction stroke, for example, the primary side suction airs in the primary suction passages 26-1, 26-2 and 26-4 of the remaining first, second and fourth cylinders respectively flow in the secondary suction passage 28-3 of the cylinder 4-3, resulting in producting a secondary side leak phenomenon.

Description

[Detailed description of the invention] ζO threat is related to the intake @ll of a multi-cylinder internal combustion engine.

By setting the cross-sectional area of the primary intake passage for low load and the secondary intake passage to a predetermined value according to the cylinder mk, the swirl generated by the primary intake air can be made powerful. OK and j! This invention relates to an internal combustion system that increases the inflow speed of the primary side leak intake air to achieve the above-mentioned swirl of 1 m and improves the combustion performance mainly in the low and medium load ranges.

A two-intake internal combustion engine with a low-lying #jlilrX intake passage and a secondary intake passage for load has an IEI
, & is used in the ninth place. However, when this Toku2 intake engine is made into a multi-cylinder engine, air flows backwards into the secondary intake passage communicating with the cylinder whose valve is closed, and the hot combustion air flows from the secondary intake passage of the cylinder whose valve is open. The so-called 8th side Rita phenomenon of intake air occurs where indoor Klk air flows in, and ζOeme, @
There is also the disadvantage that the care R and the algae prevent the strengthening of the scale.

Therefore, Li rice has a check valve installed in the 8th intake passage.
Attempts have been made to prevent secondary side leakage by providing throttle valves in each of the secondary intake passages. However, if a check valve is provided, the intake resistance increases, which is undesirable, and the structure in which a throttle valve is provided in each secondary intake passage is extremely difficult to install.
There was a drawback that it became M.

Therefore, an object of the present invention is to make the primary intake passage a relatively hot tub, and to make the primary side intake flow rate relatively large.

This primary III intake, which has high swirling properties, generates a powerful swirl, and on the other hand, the secondary intake passage, which has a relatively small diameter, reduces the flow velocity of the secondary side leak intake. The purpose is to generate a strong swirl.

Toe 9. The cross-sectional area s0 of the primary intake passage for low loads and the cross-sectional area s2 of the secondary intake passage for high loads have a relationship of a (n-1)81nS, and are centered on the low and medium load ranges. 7't
*Intake device for internal combustion engine with improved flammability t**t, 1
a<There is.

1j of this invention based on the drawings below! An example will be explained in detail and concretely.

In the irises 11a, 2 is a V cylinder block, 4 is a cylinder,
・ is the piston, 8 is the exhaust! 10 is the cylinder head, 12 is the exhaust valve, 14 is the combustion chamber, and 16 is the cylinder head.

The intake boat, and the river is the intake valve.

For example, in a four-cylinder internal combustion engine as shown in Figure 2, vaporization! 5120, the primary side and secondary side desire cylinders n, 24 are branched in the #4 direction from the primary side 22& and the M side 24&, respectively, and are provided in the first cylinder 4 with an open end. This p, cylinder 4m
K primary intake passage for low load and high load l @ tertiary intake passage 4
are formed respectively, and these intake passages 26 are formed as shown in the eighth diagram.
．． 28 is an intake valve) A single intake valve that opens and closes 16 is joined immediately upstream.

Therefore, a protrusion 1130 (see Fig. 111) is provided near this confluence point to deflect the leaking intake air and generate a swirl as shown by arrow 31 in combustion*14. do. 1 mm on the upstream side of this protrusion m130 forms a concave groove in the 8th intake passage. This concave 1132Kti primary intake passage 26 is enlarged to extend the cylinder 4. The primary intake passage 26 is formed with an open end in the tangential direction of (4-3), and is preferably formed as parallel to the deck surface 10aK of the cylinder head IO as possible. With this, 6, 2 on the primary side intake
Combustibility can be improved by generating a swirl that is strong and difficult to crush in the same direction as the swirl of the next side leak intake.

In order to make the swirl generated by the primary intake air even stronger, it is possible to
Passage W# of the next intake passage 26 has a large open area.

In other words, the lFr area S0 of the primary intake passage 26 is made smaller than the cross-sectional area 82 of the secondary intake passage 4.

When the number of cylinders is n, 4C, between the cross-sectional area S0 of the primary intake passage 26 and the cross-sectional area 82 of the secondary intake passage 4, (n-1
) 8 > 8 and each intake vent 1126
．． form 28. That is, when the number of cylinders a is 4 for 4Ia and internal combustion as shown in FIG.

Set &C% intake passage report, 4 wR area 8□, 82 to form the relationship 8B,>82. by this,
1tKIi Since the intake air flow rate becomes large and its mass becomes large, the swirl becomes strong and becomes difficult to disappear.

Since the secondary intake passage 4 has a comparatively 1 ml diameter,
The secondary side leak intake air flows out at a high flow rate, and also protrudes - (
A strong swirl is also generated in the working barrel of the
It was composed.

Next, I will explain the effect.

In the low/medium load range, the primary intake air flows through the primary intake passage station into the combustion chamber 1114, and this primary AM passage wI26
Because of the relatively large cross-sectional area 8□ consisting of e (''-1) 8□ >824'', a large amount of primary lI intake air is drawn in.

Combined with the strong swirling component of lrK, the fuel m * 1
A powerful swirl is generated within 4.

For example, if wtso cylinder 4-3 has suction quality S, other IEI, 2.40 cylinder 4-1 as mentioned above
．． ! , 4's primary intake passages 1, 2, and 4 flow into the secondary intake passage 28-3 of 4-1 during the intake stroke, and the secondary side leak structure is established. Occur. The secondary side leak intake due to this secondary side leak phenomenon is very important! 100 guide flow flows into the p-cylinder housing III and combustion 1i114
This causes a swirl in the same direction as the primary side intake air.

Then, the cross-sectional area S of the primary intake passage 26 for the number of cylinders nK
yo and the cross-sectional area of the secondary intake passage 4 is 82, (!l-1)
8. In the internal combustion engine of the 4 cylinders, a 3S□>S relationship is established, so the secondary intake AtM'18-BID cross-sectional area of the 8th cylinder 4-3 during the 8th cylinder stroke is S2. is formed to be 1 smaller than the sum of the cross-sectional area 80 of the three primary intake passages of the cylinders 4-1, 2, and 4 with Ml of 2.4. Because the secondary intake passage is relatively narrow, the intake flow rate of the secondary side leak intake is small, and this ninth, primary li
There is no need to disturb the directionality of the qi, as the 1st and 2nd order qi flows into the combustion chamber 14-3 at a high flow rate.

Due to the exhaustion 1130, the swirl of the secondary side leak intake is further strengthened.

In the high load range, lI! In addition, due to the secondary intake passage 26°, the primary intake air and the secondary intake air are simultaneously connected to the combustion chamber 1111.
14&C11t person tAml, 1st 11th inhalation tlj,
JffilK! This is because it flows into the combustion chamber 14 through the concave #l32t.

It is possible to prevent the swirl of the primary intake air from being deenergized by the secondary intake air. It was. The secondary intake air is due to the cross-sectional area 82 of the 8th intake passage and the vertical component.

Relatively good charging efficiency is maintained, and there is no disadvantage of impairing engine output.

It should be noted that the present invention is not limited to the above-mentioned embodiment K11l, and it goes without saying that each of the eleventh embodiments can be modified. ζζ
Although the description has been made using a four-cylinder internal combustion engine, this engine can be applied to any #1AIII&IIK as long as the number of cylinders is two or more. Further, the groove may be provided as desired.

As is clear from the above information, this invention.

The relationship between the cross-sectional area S□ of the primary intake passage for low load and the cross-sectional area 82 of the secondary intake passage for high load in cylinder @* is expressed as (m-1
) s > 831, it is possible to introduce a large amount of primary side intake air with high swirlability, generate a powerful swirl, and allow the secondary side leak intake air to flow in at a high flow rate. In addition to further strengthening the swirl generated by the central INK, it also has the effect of improving the combustibility mainly in the low and medium load range by promoting the swirl of the primary @ intake air.

If the primary intake air flows into the upstream side of the protruding wall and creates a swirl in the same direction as the swirl in the combustion chamber, a low-load primary intake passage is opened and provided. Swirl in the same direction can be caused in the primary side intake air and the secondary side air intake, thereby preventing the possibility that the swirl of the primary side intake air will be blocked by the secondary side leak intake air.

This powerful swirl improves the air-fuel mixture properties, increases the combustion speed, improves the lean limit and EGR limit, and improves exhaust purity and drivability! i.Furthermore, fuel efficiency can be improved.

[Brief explanation of the drawing]

Figure 1A is a longitudinal sectional view showing an intake system for an internal combustion engine according to an embodiment of the present invention, and Figure 2 is a plan view of Figure @1. FIG. 3 is an enlarged plan view showing the three-cylinder engine shown in FIG. 2. 4...Cylinder, 14...Combustion chamber, 16...Intake port. ■... Intake valve, 26... Primary intake passage for low load, 2
8-...Koki mmz Tsujitsuki Tsutou, (fund)...Oide m
, s, ... cross-sectional area of the primary intake passage for low load, S
2... Cross-sectional area of secondary intake passage for high load, n...
Number of cylinders. Agent Patent Attorney Saigo - Bidai 2 Enimai - 414-410-'1 431m

Claims (1)

[Scope of Claims] α) A multi-gas m having a low-load primary mold intake passage and a high-load secondary intake passage that merge immediately upstream of the single-A air valve.
*Based on the formula for internal combustion, the relationship between the passage cross-sectional area 8□ of the primary V&amp; , where lice is the number of cylinders. ＠、Single - Merging at the point just upstream of the test air valve 1 for low load
In a multi-cylinder compound internal combustion engine K having a secondary intake passage and a high secondary intake passage, a protrusion for deflecting leak intake air on the tertiary side is used. A wall is placed in the high-load secondary intake passage and near the intake valve, and the primary intake air flows out along one plane of the upstream side of the protruding wall, causing a swirl in the same direction as the swirl in the combustion*. The primary intake passage for low loads is opened as much as possible. Passage cross-sectional area of primary intake ventilation for low load 88 and load amount 8
The relationship with the passage cross-sectional area s2 of the next intake passage is #(tk-1)
J > ail *where n is the number of cylinders t4I
The intake system of an internal combustion engine.