JPH11153036A - Communication type double intake port for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce a swirl in a cylinder chamber though the sectional areas of the passages of two intake ports are increased and a flow rate factor is held at a high value. SOLUTION: A flow straightening plate 8 to prevent the occurrence of contact in the vicinity of a communication port 5 between a first intake flow 6 flowing through a first intake port 1 and a second intake air flow 7 flowing through a second intake port 2 is arranged in the vicinity of the communication port 5 along the direction of the length of the communication port 5. In a position where the communication port 5 is opened, the second intake port 2 is displaced to the upper side on the upper side than the first intake port 1. The flow straightening plate 8 is protruded upper side from a port upper surface part position closer to the communication port 5 of the second port under surface 9 of the upper second intake port 2. The upper edge 12 of the flow straightening plate 8 is positioned approximately in the same height as that of the virtual extension plane 11 of the first port upper surface 10 of the first intake port 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication type double intake port in which two intake ports are provided for a common cylinder chamber of an engine, and intermediate portions of the two intake ports communicate with each other. About.

[0002]

[Construction] The communicating double intake port of the engine according to the present invention is, for example, shown in FIGS. 1 to 4 (invention) or FIGS. 7 to 8.
As shown in (Prior Art), an object having the following premise configuration is targeted. [Premise Configuration] FIG. 1A is a plan view of a cutaway portion of a main part of a cylinder head, FIG. 1B is a cross-sectional view taken along line BB of FIG.
FIG. 1C is a cross-sectional view taken along line CC of FIG. 1A. FIG. 2 shows FIG.
FIG. 3A is a longitudinal sectional side view of a main part, and FIGS. 3 and 4 are perspective views. FIG. 7 is a perspective view, and FIG. 8 is a cross-sectional plan view.

[0003] In these figures, reference numeral (3) denotes a cylinder chamber. A first intake port (1) and a second intake port (2) communicating with a common cylinder chamber (3) of the engine are formed in a cylinder head (4). The intermediate portion of the first intake port (1) and the intermediate portion of the second intake port (2) are connected to each other through a communication port (5).

[Operation of Premise Configuration] As described above, when the middle part of the first intake port (1) and the middle part of the second intake port (2) are communicated through the communication port (5), There are the following advantages as compared with the case where communication is not performed. ○ Advantages 1. The passage cross-sectional area of both intake ports is increased to increase the flow coefficient and increase the engine output. At the portion where the communication port (5) is formed, the passage of both intake ports (1) and (2) is cut off by the amount of the partition wall omitted. By increasing the area and increasing the flow coefficient, the charging efficiency of the intake air can be increased and the engine output can be increased.

Advantages 2. Improve the casting accuracy of both intake ports by the integral formation of both intake port cores. Only by the integral formation of both intake port cores for casting both intake ports (1) and (2). By increasing the rigidity of the cores at both intake ports, the casting accuracy of both intake ports (1) and (2) can be increased.

[0006]

2. Description of the Related Art In the above-mentioned premise, there is a prior art shown in FIGS.
No. 7), which is as follows. Between the middle part of the first intake port (1) and the middle part of the second intake port (2), the communication port (5) is merely open, and the communication port (5) near the communication port (5) is closed. No special ingenuity has been applied.

[0007]

The above prior art has the following problems. The swirl in the cylinder chamber is reduced. The first intake flow (6) flowing in the first intake port (1) and the second intake flow (7) flowing in the second intake port (2) communicate with each other. Since they freely contact and interfere with each other in the vicinity of (5), a vortex is generated here and the flow resistance increases.

The difference between the static pressure and the dynamic pressure between the first intake flow (6) and the second intake flow (7) causes a part of the first intake flow (6) to communicate with the communication port.
(5) flows into the second intake port (2), or a part of the second intake flow (7) flows from the communication port (5) into the first intake port (1), so that the first intake port ( The first port is located downstream of the communication port (5) in the first and second intake ports (2).
The intake air flow (6) and the second intake air flow (7) interfere with each other to generate a vortex, thereby increasing the flow resistance.

Due to the increase in the flow resistance, the swirl generated in the cylinder chamber (3) is weakened, the mixing performance of air and fuel is reduced, the fuel consumption rate is increased, and the HC in the exhaust gas is reduced. Or the amount of unburned harmful components such as CO and CO may increase. An object of the present invention is to enhance swirl in a cylinder chamber while maintaining a high flow coefficient by increasing the passage cross-sectional area of both intake ports.

[0010]

According to the present invention, in order to solve the above-mentioned problem, the following characteristic structure is added to the above-mentioned premise structure, for example, as shown in FIG. 1 to FIG. 4 or FIG. 5 and FIG. It is characterized by having done. FIG. 1A is a plan view of a cutaway portion of a main part of a cylinder head, and FIG.
1B. FIG. 1C is a cross-sectional view taken along line CC of FIG. 1A. FIG. 2 is a longitudinal sectional side view of a main part of FIG. 1 (A), and FIGS. 3 and 4 are perspective views. FIG. 5 (A) is a plan view of a cutaway portion of a main part of the cylinder head, FIG. 5 (B) is a sectional view taken along line BB of FIG.
5C is a sectional view taken along line CC of FIG. 5A, and FIG.
It is a principal part longitudinal side view of (A).

○ Invention 1. Claim 1. The first intake flow (6) flowing in the first intake port (1) and the second intake flow (7) flowing in the second intake port (2) come into contact near the communication port (5). Rectifier plate (8) to prevent
It is characterized in that it is provided in the vicinity of the communication port (5) along the length direction of the communication port (5).

The engine to which the present invention is applied includes a diesel engine, a gasoline engine, a gas engine, and the like. The first intake port (1)
There are the following three types of combinations of and the second intake port (2). [1]. Direct port and direct port (Fig. 1
(See FIG. 4). [2]. Helical port and direct port (Fig. 5 ・
See FIG. 6). [3]. Helical port and helical port (not shown).

○ Invention 2. Claim 2. In the configuration of the above invention 1, the following improvement is added. At the position where the communication port (5) is opened, the second intake port (2) is displaced upward with respect to the first intake port (1). The communication port (5) on the lower surface (9) of the second port of the upper second intake port (2)
The rectifying plate (8) is provided so as to protrude upward from the lower surface portion of the port.

○ Invention 3. Claim 3. In the configuration of the above invention 2, the following improvement is added. A virtual extension plane of the first port upper surface (10) of the first intake port (1)
With respect to (11), the upper edge (12) of the current plate (8) is located at substantially the same height.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 Claims 1 and 2
・ 3. FIG. 1 to FIG. 4 FIG. 1 to FIG. 4 show a first embodiment of the communicating double intake port of the engine of the present invention. FIG. 1A is a cutaway plan view of a main part of a cylinder head for one cylinder of a direct fuel injection type multi-cylinder diesel engine. FIG. 1 (B) is FIG. 1 (A)
1 (C) is a cross-sectional view taken along line CC of FIG. 1 (A), FIG. 2 is a vertical sectional side view of a main part of FIG. 1 (A), and FIGS. 3 and 4 are perspective views. It is.

A first intake port (1) and a second intake port (2) communicating with a common cylinder chamber (3) of the engine are formed in a cylinder head (4). Both the first intake port (1) and the second intake port are direct ports. The middle part of the first intake port (1) and the middle part of the second intake port (2) are communicated via the communication port (5).

A first intake flow (6) flowing in the first intake port (1) and a second intake flow flowing in the second intake port (2).
(7) A rectifying plate (8) for preventing contact with the communication port (5) near the communication port (5) is provided along the length direction of the communication port (5) near the communication port (5). .

At the position where the communication port (5) is opened, the second intake port (2) is displaced upward with respect to the first intake port (1). The rectifying plate (8) is integrally protruded upward from the lower surface of the port near the communication port (5) of the lower surface of the second port (9) of the upper second intake port (2). The first
A virtual extension plane (1) of the upper surface (10) of the first port of the intake port (1)
In contrast to 1), the upper edge (12) of the current plate (8) is located at substantially the same height.

Embodiment 2 Claims 1, 2, 3.
FIG. 5 and FIG. 6 FIG. 5 and FIG. 6 show a first embodiment of the communicating double intake port of the engine of the present invention. FIG. 5A is a plan view of a cutaway portion of a main part of the cylinder head, and FIG.
5 (C) is a sectional view taken along line CC of FIG. 5 (A), and FIG. 6 is a vertical sectional side view of a main part of FIG. 5 (A).

In the second embodiment, a part of the configuration of the first embodiment is changed as follows.
That is, the first intake port (1) comprises a helical port, and the second intake port (2) comprises a direct port.

[0021]

Advantages of the invention (a). The swirl inside the cylinder chamber can be strengthened while maintaining a high flow coefficient by increasing the passage cross-sectional area of both intake ports. ○ The flow coefficient is increased by increasing the passage cross-sectional area of both intake ports to increase engine output. In the portion where the communication port (5) is formed, the passage cross-sectional area of both the intake ports (1) and (2) is increased by the amount of the omission of the partition wall, and the flow coefficient is increased, so that the charging efficiency of the intake air is improved. To increase the engine output.

The swirl in the cylinder chamber is strengthened. The first intake flow (6) flowing in the first intake port (1) and the second intake flow (7) flowing in the second intake port (2) are different from each other. When passing near the communication port (5), it is divided by the rectifying plate (8),
Since they are prevented from contacting and interfering with each other, a vortex does not occur here and the flow resistance does not increase.

A part of the first intake air flow (6) is connected to the communication port (5).
Flow from the communication port (5) into the first intake port (1) in large quantities from the flow straightening plate ( 8) prevents. As a result, the first port is located downstream of the communication port (5) in the first intake port (1) and the second intake port (2).
Since the intake air flow (6) and the second intake air flow (7) are prevented from interfering with each other, it is possible to prevent a vortex from occurring here and increase the flow resistance.

Due to the reduction of the flow resistance, the first intake air flow (6) and the second intake air flow (7) become faster,
The swirl generated in the cylinder chamber (3) is strengthened, the mixing performance of air and fuel is improved, the fuel consumption rate is reduced, and the amount of unburned harmful components such as HC and CO in exhaust gas is generated. Or decrease.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a communicating double intake port of an engine according to the present invention. 1A is a cutaway plan view of a main part of a cylinder head, FIG. 1B is a cross-sectional view taken along the line BB of FIG. 1A, and FIG. 1C is a CC of FIG. 1A. Line sectional view.

FIG. 2 is a longitudinal sectional side view of a main part of FIG. 1 (A).

FIG. 3 is a perspective view of the communication type double intake port of FIG.

FIG. 4 is a perspective view of the communicating double intake port shown in FIG. .

FIG. 5 shows a second embodiment of the communicating double intake port of the engine of the present invention. 5A is a cutaway plan view of a main part of the cylinder head, FIG. 5B is a sectional view taken along line BB of FIG. 5A, and FIG. 5C is a sectional view taken along line CC of FIG. 5A. Line sectional view.

FIG. 6 is a vertical sectional side view of a main part of FIG. 5 (A).

FIG. 7 is a perspective view of a communication type double intake port of an engine showing a conventional technique.

FIG. 8 is a cross-sectional plan view of the communication type double intake port of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st intake port, 2 ... 2nd intake port, 3 ... cylinder chamber, 4 ... cylinder head, 5 ... communication port, 6
... First intake flow, 7 ... Second intake flow, 8 ... Rectifier plate, 9
... 2nd port lower surface, 10 ... 1st port upper surface, 11 ...
Virtual extension plane, 12 ... upper edge.

Claims (3)

[Claims] A first intake port (1) and a second intake port (2) communicating with a common cylinder chamber (3) of an engine are formed in a cylinder head (4), and the first intake port (1) is formed. And an intermediate portion of the second intake port (2) communicates through the communication port (5). The communication-type double intake port of the engine flows through the first intake port (1). A rectifying plate (8) for preventing the first intake air flow (6) and the second intake air flow (7) flowing in the second intake port (2) from coming into contact with each other near the communication port (5);
A communication-type double intake port for an engine, wherein the communication-type double intake port is provided near the communication port (5) along the length direction of the communication port (5). 2. A first position at which the communication port (5) opens.
The second intake port (2) is displaced upward with respect to the intake port (1), and a lower port portion of the upper second intake port (2) near the communication port (5) of the second port lower surface (9). 2. The communicating double intake port of the engine according to claim 1, wherein the straightening plate (8) protrudes upward from the opening. 3. 3. An upper edge (12) of the rectifying plate (8) is substantially at the same height with respect to a virtual extension plane (11) of a first port upper surface (10) of the first intake port (1). The communicating double intake port of the engine according to claim 2, wherein the port is located.