JPS6341565Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an intake manifold device for an internal combustion engine.

(Prior art) The intake manifold installed between the carburetor and the engine body includes a main intake passage that supplies a lean mixture to the main combustion chamber of the engine, and a rich mixture to the auxiliary combustion chamber. The main intake passage is further defined at the intake introduction portion into a low-load passage and a high-load passage, and an engine cooling channel is provided below a mixture distribution chamber that branches the main intake passage. a hot water heating chamber communicating with the distribution chamber, the hot water in the heating chamber heats the intake air-fuel mixture in the distribution chamber to promote atomization and improve combustion efficiency, and an exhaust gas recirculation passage communicating with the distribution chamber. It is well known that the exhaust gas is provided in the intake manifold to recirculate a portion of the exhaust gas to the intake system in order to prevent the generation of nitrogen oxides (NOx).

(Problem that the invention aims to solve) However, when the exhaust gas flows into the mixture passage in a high-temperature state, the fuel particles in the mixture are heated, and the high boiling point components of them form a tar-like mixture. , it adheres to the inner wall of the intake passage and the intake valve, etc.
This will adversely affect engine operation. On the other hand, when the temperature of the recirculated exhaust gas decreases, the exhaust recirculation control valve installed in the exhaust gas recirculation passage tends to malfunction due to clogging with free carbon in the exhaust gas, and the recirculated exhaust gas is adjusted to match the operating conditions of the engine. flow rate control cannot be obtained.

The present invention was developed in view of the above circumstances, and prevents the temperature of the exhaust gas from decreasing just before it is introduced into the exhaust recirculation control valve, thereby avoiding malfunction of the control valve, and at the same time allows the exhaust gas to pass through the control valve and mix. An internal combustion engine in which the exhaust gas just before it flows into the air passage is cooled by cooling water for heating the mixture in the intake manifold, thereby preventing the recirculated exhaust gas from heating the high boiling point components of the fuel in the mixture. An object of the present invention is to provide an intake manifold device.

(Means for Solving the Problems) In order to achieve the above object, the intake manifold device for an internal combustion engine of the present invention includes an intake manifold body disposed on one side of the engine body, and an intake manifold body disposed on one side of the intake manifold body. a plurality of intake passages connected to each intake port of the engine body; a mixture distribution chamber for distributing the intake mixture to each intake passage; and a mixture distribution chamber provided in the intake manifold body and connected to an engine cooling water passage. An intake manifold device having a hot water heating chamber that heats the mixture distribution chamber, and an exhaust gas recirculation passage provided in the intake manifold body and communicating the exhaust system of the engine body and the mixture distribution chamber,
A mounting surface of the recirculation control valve disposed in the exhaust gas recirculation passage is formed near a joint surface of the intake manifold main body with the engine main body, and one end is opened at the mounting surface and the other end is opened at the joint surface. A first exhaust gas recirculation passage is integrally formed in the intake manifold body with the entire passage spaced apart from the engine cooling water passage, one end of which is provided on the mounting surface, and the other end is provided on one side of the air-fuel mixture distribution chamber. An open second exhaust gas recirculation passage is integrally formed in the intake manifold main body so that at least a portion thereof is adjacent to a cooling water passage extending from the engine cooling water passage to the hot water heating chamber via a partition wall.

(Function) Since the entire first exhaust gas recirculation passage is separated from the cooling water passage, the exhaust gas flowing into the first exhaust gas recirculation passage is not cooled.

Further, at least a portion of the second exhaust gas recirculation path is
Since it is adjacent to the cooling channel via the partition wall, the exhaust gas flowing into the second exhaust gas recirculation channel is sufficiently cooled.

(Example) An example of the present invention will be described below in detail based on the accompanying drawings.

FIG. 1 is a plan view of the intake manifold according to the present invention, in which a distribution chamber 2 is formed at the introduction part of the main intake air in the intake manifold body 1, and this distribution chamber 2 is formed by a partition wall 3 disposed approximately in the center. It is defined into a low load passage 2a and a high load passage 2b. Distribution room 2
Main intake passages 4 and 5 are communicated with one open end, and main intake passages 6 and 7 are communicated with the other open end, and the open ends 4a to 7 of each of these intake passages 4 to 7 communicate with each other.
a is opened at the joint surface 1a with the engine body E, as shown in FIG. The passages 2a and 2b are
A hole 8b opened in the upper surface 8a of the carburetor mounting portion 8 provided at the upper part of the intake manifold body 1;
It is connected to 8c.

A recirculation control valve mounting surface 11 is formed in the upper part of the intake manifold body 1 in the vicinity of the joint surface 1a with the engine main body E in the exhaust gas recirculation passage. (1st)
It is divided into an exhaust gas recirculation passage 10 and a downstream (second) exhaust gas recirculation passage 9.

The exhaust gas recirculation passage 9 on the downstream side is formed integrally with a cooling water passage 15d (described later) along one side 1b of the intake manifold main body 1 via a partition wall, and the one side open end 9a is a distribution passage. It opens to the low-load passage 2a of the chamber 2, and the other open end communicates with a hole 11b that opens to the upper surface 11a of the recirculation control valve mounting surface 11 provided at the upper part of the intake manifold body 1. The entirety of the upstream exhaust gas recirculation passage 10 is formed integrally with the engine cooling channel, which will be described later, along the joint surface 1a of the intake manifold body 1, and one open end 10a is formed integrally with the joint surface 1a. The opening end on the other side communicates with a hole 11c opening in the upper surface 11a of the recirculation control valve mounting surface 11. A recirculation control valve (not shown) is disposed on the upper surface 11a of the recirculation control valve mounting surface 11, and the holes 11b and 11c communicate with each other through the control valve, so that the exhaust gas recirculation passage 9 on the downstream side and the exhaust gas recirculation passage on the upstream side are connected. 10 form a series of exhaust gas recirculation passages. In the low-load passage 2a of the distribution chamber 2, there is a partition wall 12 for gas deflection facing the open end 9a of the exhaust gas recirculation passage 9 on the downstream side.
is provided.

One side open end 13 of the blow-by gas recirculation passage 13
The opening end 13b on the other side is opened at the upper part of the intake manifold main body 1, and the opening end 13b is opened at the high-load passage 2b of the distribution chamber 2, respectively.

A hot water heating chamber 15 is formed below the distribution chamber 2 of the intake manifold body 1, as shown in FIG. 2 room 1
5c, and the first chamber 15b is located along one side 1b of the intake manifold main body 1 and below the exhaust gas recirculation passage 9 on the downstream side as shown in FIGS. 4 and 5. The opening end 15e of the cooling water passage 15d is opened to the joint surface 1a, and the second chamber 15c is connected to the side of the intake manifold body 1. It communicates with a passage 15f that opens toward the front. Furthermore, this hot water heating chamber 15 is shown in FIGS. 1 and 7.
As shown in the figure, it opens at the upper part of the intake manifold body 1 via a passage 16.

As shown in FIG. 7, a sub-intake distribution chamber 17 is formed within the partition wall between, for example, one passage 2b of the distribution chamber 2 of the intake manifold main body 1 and the hot water heating chamber 15. An air intake introduction part 17 (not shown) is formed at the axis of a boss part 3a formed at the end of the partition wall 3 shown in FIG. The sub-intake passages 18, 19 and 20, 21 are provided in the intake air outlet portions 17a and 17b (FIG. 2) on both sides of the sub-intake distribution chamber 17.
are connected and formed. The opening ends 18a to 21a of each of these sub-intake passages 18 to 21 are opened to the joint surface 1a, as shown in FIGS. 2 and 3.

A hole 8b opening in the upper surface 8a of the carburetor mounting part 8,
8c and 3b are respectively connected to the downstream side of a low-load throttle valve, a high-load throttle valve, and an auxiliary throttle valve of a carburetor (not shown) mounted and fixed on the upper surface 8a, and are connected to the intake passages 4-7, 18- Each of the open ends 4a to 7a and 18a to 21a of 21 communicates with a main combustion chamber and a sub-combustion chamber of each cylinder of an engine (not shown), respectively. Reflux control valve mounting surface 11 (first
The holes 11b and 11c in the figure) are connected to a recirculation control valve (not shown) disposed on the upper surface 11a, and the open end 10a of the upstream exhaust recirculation passage 10 is connected to the exhaust recirculation port Ea of the engine body E. ing.
The open end 13a of the blow-by gas recirculation passage 13 is connected to another blow-by gas recirculation passage (not shown). The opening end 15e of the cooling water passage 15d is connected to the engine head side passage of the engine cooling water passage (not shown), and the opening end 15g of the passage 15f of the heating chamber 15c is connected to the engine head side passage of the engine cooling water passage (not shown).
is connected to a passage on the radiator side (not shown), and the passage 16 is connected to another hot water passage (not shown).

In such a configuration, the cooling water led from the engine cooling water passage flows from the open end 15e to the cooling water passage 15.
d into the heating chambers 15b and 15c, and flows out from the open end 15g to the radiator side. When the cooling water flows through this path, the peripheral wall portion of the cooling water passage 15d is cooled. Hole 8b from the vaporizer (not shown)
The air-fuel mixture introduced into the distribution chamber 2 and the sub-intake distribution chamber 17 through the holes 3b and 8c is heated to a substantially constant temperature by the hot water heating chamber 15, respectively, and then passed through the respective intake passages 4-7, 18- 21 respectively. This heating promotes atomization of the air-fuel mixture.

Exhaust gas flowing into the upstream exhaust gas recirculation passage 10 from its one open end 10a is guided into the downstream exhaust gas recirculation passage 9 via the recirculation control valve (not shown), as described above, to the distribution chamber 2. It is introduced into the passage 2a. At this time, the air-fuel mixture is distributed almost equally on both the left and right sides by the partition wall 12, and is supplied to each of the intake passages 4 to 7 together with the air-fuel mixture in the passage 2a. No cooling water passage is provided near the upstream exhaust gas recirculation passage 10, and therefore, the exhaust gas flowing into the upstream exhaust gas recirculation passage 10 is not cooled by the cooling water.

On the other hand, one open end 10a of the upstream exhaust gas recirculation passage 10 is opened at the joint surface 1a with the engine body E, and is communicated directly with the exhaust gas recirculation port Ea of the engine body E, thereby preventing a decrease in the temperature of the exhaust gas and , by forming the flow rate control valve mounting surface 11 near the joint surface 1a, the upstream exhaust gas recirculation passage 1
0, prevention of a drop in exhaust gas temperature is facilitated, and the exhaust gas is guided to the flow rate control valve while remaining at a high temperature. Exhaust gas recirculation passage 9 downstream from this flow control valve
The exhaust gas introduced into the exhaust gas recirculation passage 9 is cooled by the cooling water flowing through the cooling water passage 15d, which is provided below the exhaust gas recirculation passage 9 and adjacent to the entire passage 9 via a partition, and reaches a substantially constant temperature. be introduced within.

Further, the blowby gas introduced into the blowby gas recirculation passage 13 is introduced into the passage 2b of the distribution chamber 2, and is supplied into each intake passage 4 to 7 together with the air-fuel mixture in the distribution chamber 2, similar to the exhaust gas. .

As explained above, the present invention includes an intake manifold body disposed on one side of the engine body, and a plurality of intake manifold bodies disposed on one side of the intake manifold body and communicating with each intake port of the engine body. an intake passage; a mixture distribution chamber for distributing the intake mixture to each intake passage; a hot water heating chamber provided in the intake manifold body and connected to an engine cooling water passage to heat the mixture distribution chamber; In an intake manifold device having an exhaust gas recirculation passage provided in a manifold body and communicating the exhaust system of the engine body and the mixture distribution chamber, a mounting surface of a recirculation control valve disposed in the exhaust gas recirculation passage, formed near the joint surface of the intake manifold body with the engine body,
A first exhaust gas recirculation passage having one end open to the mounting surface and the other end opening to the joint surface is integrally formed in the intake manifold body with the entire passage spaced apart from the engine cooling water passage, and one end opens to the mounting surface. on the face,
A second exhaust gas recirculation passage whose other end opens to one side of the air-fuel mixture distribution chamber is arranged such that at least a portion thereof is adjacent to a cooling water passage extending from the engine cooling water passage to the hot water heating chamber via a partition wall. It is characterized in that it is integrally formed with the intake manifold main body.

Therefore, since the temperature of the exhaust gas just before it flows into the recirculation control valve is prevented from decreasing, malfunction of the recirculation control valve due to free carbon in the exhaust gas is prevented, and the flow rate of the exhaust gas can be effectively controlled according to the operating state of the engine. At the same time, the durability of the control valve can be improved.

In addition, since the exhaust gas is effectively cooled just before it flows into the intake passage, it prevents the fuel in the air-fuel mixture from overheating due to recirculated exhaust air, suppresses the formation of tar-like air-fuel mixture, and maintains the intake system in a normal state. to ensure normal operation of the engine.

[Brief explanation of drawings]

FIG. 1 is a plan view of an intake manifold device for an internal combustion engine according to the present invention, FIG. 2 is a bottom view of FIG. 1, FIG. 3 is a view taken along the line in FIG.
Figure 5 is a cross-sectional view taken along the - line in Figure 1, Figure 6 is a cross-sectional view taken along the - line in Figure 1, and Figure 7 is a cross-sectional view taken along the - line in Figure 1. It is a diagram. 1...Intake manifold body, 2...Distribution chamber,
3, 12... Partition wall, 4-7, 18-21... Intake passage, 9, 10... First and second exhaust gas recirculation passage,
13...Blow-by gas recirculation passage, 15...Hot water heating chamber, 15d...Cooling water passage.

Claims (1)

[Scope of utility model registration request] An intake manifold body disposed on one side of the engine body, a plurality of intake passages provided on one side of the intake manifold body and communicating with each intake port of the engine body, and an intake air-fuel mixture arranged in each intake passage. a hot water heating chamber provided in the intake manifold body and connected to the engine cooling water passage to heat the mixture distribution chamber; In an intake manifold device having an exhaust gas recirculation passage that communicates between a system and the air-fuel mixture distribution chamber, a mounting surface of a recirculation control valve disposed in the exhaust gas recirculation passage is connected to the engine body of the intake manifold body. A first exhaust gas recirculation passage is formed near the surface and has one end opening at the mounting surface and the other end opening at the joint surface, and the entire passage is integrally formed with the intake manifold body, separated from the engine cooling water channel. and a second exhaust gas recirculation passage having one end opening to the mounting surface and the other end opening to one side of the air-fuel mixture distribution chamber, and at least a portion of the second exhaust gas recirculation passage opening from the engine cooling water passage to the hot water heating chamber. An intake manifold device for an internal combustion engine, characterized in that the intake manifold device is integrally formed with the intake manifold main body so as to be adjacent to the passage through a partition wall.