JP3324913B2 - V-type multi-cylinder engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for a V-type multi-cylinder engine, and more particularly to an intake system for a V-type multi-cylinder engine provided with an EGR device for supplying EGR gas to a pair of resonance chambers provided in an intake system. Related to the device.

[0002]

2. Description of the Related Art An engine equipped with an EGR (exhaust gas recirculation) device for recirculating a part of exhaust gas extracted from an exhaust system to an intake system in order to reduce harmful components in the exhaust gas is well known. . In such an engine, a rib is provided between an intake inlet and an EGR gas discharge port so that EGR gas introduced into a branch of an intake system is prevented from interfering with intake air and is evenly distributed to each cylinder. (See Japanese Utility Model Laid-Open No. 34152/1987).

[0003]

However, only by providing a rib in front of the EGR gas discharge port as in the prior art described above, the intake air over the rib disturbs the flow direction of the EGR gas due to a change in the operating state of the engine. Or the EGR gas stays in the vicinity of the EGR gas discharge port, which may hinder the uniform distribution of the EGR gas to each cylinder. In particular, in the case of a V-type multi-cylinder engine, there is a problem that it is difficult to evenly distribute the EGR gas to each bank since the left and right banks are arranged shifted in the axial direction of the crankshaft.

Further, as described in Japanese Utility Model Publication No. 63-37454, in an engine in which blow-by gas is introduced into an intake system chamber, oil mist contained in the blow-by gas diffuses into the chamber.
The oil condensed by the oil mist may stay on the bottom wall of the chamber. Therefore, when the EGR gas is supplied into the intake system chamber through the EGR gas discharge port, oil mist or oil adheres to the EGR gas discharge port and carbonizes, thereby obstructing the smooth supply of the EGR gas. There is.

The present invention has been made in view of the above circumstances, and in a V-type multi-cylinder engine provided with a pair of resonance chambers, the EGR gas is equally distributed to both resonance chambers without stagnation, and the EGR gas is distributed. An object is to prevent oil from adhering to a discharge port.

[0006]

In order to achieve the above object, the present invention provides a pair of resonance chambers connected between two banks of a V-type multi-cylinder engine via a suction passage downstream of a throttle body. And an intake manifold curved upward from the upper portions of the two resonance chambers and connected to the cylinders of the two banks, and an EGR gas discharge port is opened on the side wall of the chamber of one of the resonance chambers. In a suction device of a V-type multi-cylinder engine having a blow-by gas discharge opening opened upstream of the blow-by gas discharge port located on the chamber bottom wall of one of the resonance chambers and facing the EGR gas discharge port A partition wall is set up in such a manner that one end of the partition wall is connected to a chamber partition wall that partitions both resonance chambers, and the other end is connected to an EGR gas. The EGR gas discharged from the discharge port, characterized in that biases on the side close to the EGR gas discharge port so as to direct the communication hole penetrating the chamber partition wall.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 7 show a first embodiment of the present invention. FIG. 1 is a partial longitudinal sectional view of a V-type six-cylinder engine, and FIG.
3 is an enlarged sectional view taken along line 3-3 of FIG. 1, FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a view taken along line 5-5 of FIG. 3 is a sectional view taken along line 6-6 of FIG. 3, and FIG. 7 is a transverse perspective view of the intake device.

As shown in FIGS. 1 and 2, a V-type six-cylinder
Engine E is a left bank B arranged in a V-shape_LAnd right van
K B_RIs provided. Left and right bank B_L, B_RRespectively
Cylinder block 1_L, 1_RAnd joined to its deck surface
Cylinder head 2_L, 2 _RAnd the left
Double Block 1_LHas three left cylinders 3_L… In series
Formed and also the right cylinder block 1_RAlso three right
Linda 3_RAre formed in series. Three syringes on the left
Da3_L… Is the left cylinder group C where the intake stroke is not continuous_LBe composed
And the three cylinders 3r on the right continue the intake stroke.
No right cylinder group C_RIs configured.

Each cylinder 3 _L ... 3 _R.
Are slidably fitted, and these pistons 4 are connected to the crankshaft 6 via connecting rods 5.
The left and right cylinder heads 2 _L and 2 _R are formed with combustion chambers 7 facing the pistons 4, and intake ports 8 and exhaust ports 9 communicating with the combustion chambers 7, respectively.
Each intake port 8 is provided with an intake valve 10 and each exhaust port 9 is provided with an exhaust valve 11.

[0011] A suction device I between the left bank B _L and the right bank B _R is provided, the intake system I is connected to the left and right cylinder head 2 _L, 2 plurality of intake ports of the _R 8 ... . The plurality of exhaust ports 9 ... The conventional exhaust system of the left and right cylinder head 2 _L, 2 _R (not shown) is connected.

Next, with reference to FIGS.
Will be described in detail.

The intake device I includes a throttle body 22 having a throttle valve 21, an intake passage 23 connected downstream of the throttle body 22, a valve body 24 connected downstream of the intake passage 23, and a valve body 24. 2
4 and an intake manifold 26 coupled to the upper surface of the valve body 24 and connected to the six intake ports 8. Fuel injection valves 27 are provided in the vicinity of the connection between the intake manifold 26 and the intake ports 8 (see FIG. 1).

As is apparent from FIGS. 3 to 5, the suction chamber 25 is a tray-shaped member having an open upper surface.
Left resonance chamber 28 extending along left bank B _L
And _L, the right resonance chamber 2 extending along a right bank B _R
8 and _R arranged via through the chamber partition wall 29, on both the resonance chamber 28 _L, 28 _R are introduced air from the front side in the direction of the arrow. Although the right resonance chamber 28 _R is formed substantially linearly, the left resonance chamber 28 _L by the thick portion 29 ₁ formed in the chamber partition wall 29,
It is formed in a substantially L-shape with the rear end side expanding.

Since the left bank B _L and the right bank B _R are displaced in the axial direction of the crankshaft 6, the chamber side wall 30 _L of the left resonance chamber 28 _L at the rear end side of the intake chamber 25 is connected to the right resonance chamber 28 _R. It is offset forward relative to the chamber sidewalls 30 _R, which step is formed. Left resonance chamber 28 _L chamber sidewall 30 _L of the lid 31 and the joint 32 to the rear of the bolt 33 ...
The chamber side wall 30 _L and the lid 31
An EGR chamber 34 is defined therebetween. EGR supplied to an EGR chamber 34 from an EGR pipe 35 connected to the joint 32
Gas is discharged from the EGR gas discharge ports 36 bored in the chamber side wall 30 _L on the left resonance chamber 28 _L.

An L-shaped partition wall 38 erected on the chamber bottom wall 37 of the left resonance chamber 28 _L has a horizontal wall 381 extending leftward from the chamber partition wall 29 and a horizontal wall 3 _1.
Is composed of a vertical wall 38 ₂ which extending toward the chamber side wall 30 _L 8 ₁ tip opening 39 is formed between the vertical wall 38 ₂ of the tip and the chamber side wall 30 _L. A substantially central position of the chamber side wall 30 _L and the lateral wall 38 _1, the communication port 40 communicating the left resonance chamber 28 _L and the right resonance chamber 28 _R is bored.

As apparent from FIG. 3, the height of the partition wall 38 is set higher than the height of the upper end of the EGR gas discharge port 36, and is set substantially equal to the height of the center of the communication port 40. I have. As apparent from FIG. 5, the EGR gas discharge port 36 is directed to the lateral wall 38 ₁ of the substantially central portion of the partition wall 38, thus the EGR gas discharge port 36 from the vertical wall 38 ₂ of the chamber partition wall 29 and the partition 38 They are located at approximately equal distances. The higher the partition wall 38 is, the more effective it is. However, since the open / close valve 52 described later is located above the partition wall 38, the height of the partition wall 38 is limited to a height that does not interfere with the open / close valve 52 rotated to the valve open position. Is done.

Referring to FIG. 6 together, it is clear that
Left and right connecting portions 42 _L and 42 _R partitioned by an intermediate wall 41 are formed at the front portion of the valve body 24 superimposed on the upper surface of the intake chamber 25.
_L, 42 and a downstream end and the left and right resonance chambers 28 _L, 28 _R upstream end of the intake passage 23 is connected by _R. Most of the lower surface of the valve body 24 is provided with the valve support walls 43 _L and 43 _L.
R, and the valve support walls 43 _L , 4
3 by a crank-shaped partition wall 44 erected on the upper surface of the _R and the left communicating chamber 45 _L and Migirendori chamber 45 _R is defined. Valve support wall 43 _L, 43 to the rear end of the _R and the left opening 46 _L and a right opening 46 _R is formed, the left resonance chamber 28 _L via the left opening 46 _L within Hidarirendori chamber 45 _L Always communicates with the right opening 46 _R
Via the right resonance chamber 28 _R through the right communication chamber 4
5 Always communicate with _R.

Valve support wall 4 of left communication chamber 45 _L
The 3 _L together one valve hole 47 _L is opened, the valve support wall 43 _R of Migirendori chamber 45 _R 2 amino valve hole 47 _R, 48 is opened. Left and right valve holes 4
7 _L and 47 _R can be opened and closed by opening and closing valves 50 _L and 50 _R supported by valve shafts 49 _L and 49 _R , and a valve hole 48 is provided by an opening and closing valve 5 supported by a valve shaft 51.
2 can be opened and closed. Thus, two valve shafts 4
9 _L and 49 _R are driven in conjunction by a common actuator 53, and the valve shaft 51 is driven by an actuator 54.

When the opening / closing valves 50 _L and 50 _R are in the closed state, the left resonance chamber 28 _L and the left communication chamber 45 _L communicate with each other through the left opening 46 _L and the right resonance chamber 28 _R and the right communication. chamber 45 _R communicates via the right opening 46 _R. And opening and closing valve 5
When the valves 0 _L and 50 _R are opened, the left resonance chamber 28 _L and the left communication chamber 45 _L are short-circuited via the valve hole 47 _L , and the right resonance chamber 28 _R and the right communication chamber 45 _R are connected to the valve hole 47 _R. Short circuit through.

[0021] When the opening and closing valve 52 is in a closed state, Hidarirendori chambers 45 _L and Migirendori chamber 45
Communication between _R is blocked but, when opening the opening and closing valve 52, Hidarirendori chambers 45 _L and Migirendori chamber 45 _R communicates via a valve hole 48.

The left communication chamber 45 _L has three cylinders 3 _{R in which} the suction order of the right bank B _R is not continuous via three suction pipes 55 _L provided in the intake manifold 26.
And the same right communication chamber 45 _R
Are three intake pipes 55 _R provided in the intake manifold 26.
Are connected to the three cylinders 3 _L ... In which the intake order of the left bank B _L is not continuous.

As shown in FIG. 3, the throttle body 22
A blow-by gas discharge port 56 is formed on the upper surface of the
The blow-by gas is supplied to the blow-by gas discharge port 56 via a blow-by gas pipe 57.

Next, the operation of the embodiment of the present invention having the above configuration will be described.

According to the operating state of the engine E, two
The operation of the tutors 53 and 54 is controlled, and the open / close valve 5
0_L, 50_R, 52 are driven to open and close. For example, engine
In the lower low speed operation state where the rotation speed of the
Opening and closing valve 50_L, 50_R, 52 are FIGS. 3, 4 and FIG.
The valve is closed as shown in FIG._L, 47_R, 48
And close the left and right communication chambers 45_L, 45_RMutual ream
Communication is blocked and the left and right communication chambers 4
5_L, 45_RLeft and right resonance chambers 28 corresponding to _L,
28_RThe short circuit between them is also cut off. In this state, the left resonance
Chamber 28_L, Left opening 46_L, Left communication chamber 4
5_LAnd intake pipe 55_L… Through the right cylinder group C_RTo
Intake system and right resonance chamber 28_R, Right opening 4
6_R, Right communication chamber 45_RAnd intake pipe 55_RThrough ...
And left cylinder group C_LIntake system that leads to
Two systems of resonance supercharging intake systems that do not cause air interference are configured,
Moreover, the natural frequency of the resonance supercharged intake system is
Approximately coincides with the opening and closing cycle of each intake valve 10 in the lower low speed rotation range
Is set to enable the resonance supercharging effect
The volumetric efficiency of the engine E in the lower low speed range
Enhanced.

The rotation speed of the engine E is slightly increased and is higher.
In the low-speed operation state, the actuator 53 is activated.
Left and right open / close valve 50_L, 50_ROpened, so far left
Right opening 46_L, 46_RLeft and right that were communicated through
Resonance chamber 28_L, 28 _RAnd left and right communication chamber
45_L, 45_RAnd the valve hole 47_L, 47_RShort through
Get involved. This reduces the effective length of the resonant intake system
The natural frequency of the resonance supercharging system is
High in the shift range so as to substantially coincide with the opening / closing cycle of each intake valve 10.
In short, the resonance supercharging effect is effectively exhibited
Volumetric efficiency in the low-speed rotation range is improved.

When the engine E reaches a high-speed operation state,
Furthermore the actuator 54 is operated to open and close valve 52 is opened, to communicate together via the valve hole 48 a lateral communicating chamber 45 _L, 45 _R of. As a result, formed right and left of the communicating chamber 45 _L, 45 _R and the left and right resonance chambers 28 _L, 28 large becomes inertial supercharging system _{volume R} is integrated as shown in FIG. 7, the in this state 2 The system's resonant intake system is canceled. The negative pressure wave generated during the intake stroke of the engine E is reflected and inverted by the large-volume inertial supercharging system, and the positive pressure wave is transmitted to the intake ports 8 of the cylinders 3 _L , 3 _R. Thereby, the inertia supercharging effect in the high-speed rotation region can be effectively exhibited, and the volume efficiency can be increased.

By the way, during the operation of the engine E, the exhaust gas is taken from the exhaust system.
The discharged EGR gas is supplied to the EGR pipe 34 and the EGR chamber.
34 and the left resonance chamber through the EGR gas discharge port 36
28 _LSupplied to Left resonance chamber 28_LSupplied to
The discharged EGR gas is distributed so as to face the EGR gas discharge port 36.
Side wall 38 of placed partition wall 38₁It is blocked by right and left and right
And a part thereof is a vertical wall 38 of the partition wall 38._TwoAnd chamber side walls
30_LFrom the opening 39 formed between the left resonance chamber
-28_LDiffuses into the air and mixes with the intake air.
The part passes through a communication port 40 formed in the chamber partition wall 29.
Over right resonance chamber 28_RSpreads inside and mixes with intake air
I do.

As described above, the partition wall 38 and the chamber side wall 3
0 or so to form an opening 39 between the _L in the vicinity of the EGR gas discharge port 36 just is not the EGR gas stays, vertical wall 38 ₂ extending toward the chamber side wall 30 _L
The EGR gas is directed toward the communication port 40 of the chamber partition wall 29 by the
8 resonance chamber 28 of the left and right by supplying EGR gas sufficient amount in _{R L,} 28 _R in EGR gas can be uniformly distribute.

Further, EGR gas discharge ports 36 of the chamber sidewall 30 _L is provided at a substantially central portion of the chamber partition wall 29 and vertical wall 38 _2, and the chamber partition wall 2
For 9 communicating port 40 is provided at a substantially central position of the chamber side wall 30 _L and the lateral wall 38 _1, the communication port 40 smoothly without EGR gases exiting EGR gas discharge port 36 to rapidly redirecting You will be guided. The EGR gas discharged from the EGR gas discharge port 36 is blocked by the side wall 38 _{1 of the} partition wall 38 and flows upward so as to get over the side wall 38 ₁ , but the height of the communication port 40 is made higher than the height of the EGR gas discharge port 36. As a result, the upwardly flowing EGR gas can be smoothly guided to the communication port 40.

From the blow-by gas discharge port 56 to the intake passage 2
The blow-by gas containing oil mist supplied to 3,
The air is supplied to the left and right resonance chambers 28 _L and 28 _R together with the intake air. Blow-by gas that has flowed into the left resonance chamber 28 _L can not reach blocked by the partition wall 38 directly to the EGR gas discharge port 36, thus greatly the amount of oil mist contained in the blow-by gas adheres to the EGR gas discharge ports 36 Therefore, even if the oil mist is carbonized by heat, there is no danger of the oil mist adhering and accumulating on the EGR gas discharge port 36.

The EGR gas discharge port 36 and the communication port 4
Since each of the holes 0 is open at a position higher than the chamber bottom wall 37, even if oil condensed by oil mist stays on the chamber bottom wall 37, the oil may adhere to the EGR gas discharge port 36 and flow into the EGR gas discharge port 36. There is no.

Although the communication port 40 is formed by drilling, by providing the communication port 40 at a high position near the upper surface of the valve body 24, the drilling can be easily performed. If the diameter of the communication port 40 is too large, the left and right resonance chambers 28 _L and 28 _R communicate with each other to constitute the resonance supercharging intake system, and the resonance supercharging effect is impaired. There for EGR gas supply amount to the right resonance chamber 28 _R not easily pass is insufficient, it is desirable in consideration of them to set the diameter of the communication port 40.

Next, a second embodiment of the present invention will be described with reference to FIG.

The second embodiment is different from the first embodiment in the shape of the partition 38, and the other structure is the same as that of the first embodiment. Partition wall 38 of the second embodiment is a linear, one end and the other end is connected to the chamber partition wall 29 is inclined toward the chamber side wall 30 _L, the other end and the chamber side wall 30 _L An opening 39 is formed therebetween. The linear partition wall 38 which is inclined and disposed in the second embodiment.
Accordingly, the same operation and effect as those of the L-shaped partition wall 38 of the first embodiment can be obtained.

Although the embodiments of the present invention have been described in detail above, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the EGR gas is led to the EGR gas discharge port 36 via the EGR chamber 34, but the EGR chamber 34 is omitted and the EGR pipe 35 is directly connected to the EGR pipe 35.
It is also possible to connect to the R gas discharge port 36. Further, in the embodiment, the main body of the intake device I is composed of three members of the valve body 24, the intake chamber 25 and the intake manifold 26, but the valve body 24 and the intake manifold 26 are integrally composed of two members. It is also possible. Although in the embodiment is made to open the blow-by gas discharge port 56 to the intake passage 23, it is possible to open it to the left and right resonance chambers 28 _L, 28 _R.

[0038]

As described above, according to the present invention, a partition wall is provided on the bottom wall of one of the resonance chambers so as to be located downstream of the blow-by gas discharge port and to face the EGR gas discharge port. One end of the partition is connected to a chamber partition wall for partitioning both resonance chambers, and the other end is directed to an EGR gas discharged from the EGR gas discharge port to a communication port penetrating the chamber partition wall.
Since it is biased to the side approaching the gas discharge port, a part of the EGR gas discharged from the EGR gas discharge port is supplied to one of the resonance chambers from the opening opposite to the chamber partition wall, and the EGR gas is discharged. The remainder can be guided to the chamber partition wall side by the partition wall and supplied to the other resonance chamber from the communication port. As a result, the EGR gas discharged from one EGR gas discharge port is
It is possible to uniformly supply the gas to the pair of resonance chambers and mix it with the intake air without staying near the gas discharge port. Also, by blocking the oil mist of the blow-by gas contained in the intake air by the partition wall, the oil mist is
It can be prevented from adhering to the R gas discharge port.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a V-6 engine.

FIG. 2 is a plan view of a cylinder block.

FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a view taken along line 5-5 in FIG. 3;

FIG. 6 is a view taken along line 6-6 of FIG. 3;

FIG. 7 is a cross-sectional perspective view of an intake device.

FIG. 8 is a view corresponding to FIG. 5 according to a second embodiment.

[Explanation of symbols]

3 _L left cylinder (cylinder) 3 _R right cylinder (cylinder) 22 throttle body 23 intake passage 26 intake manifold 28 _L left resonance chamber (resonance chamber) 28 _R right resonance chamber (resonance chamber) 29 chamber partition wall 30 _L chamber side wall 36 EGR gas discharge port 37 Chamber bottom wall 38 Partition wall 40 Communication port 56 Blow-by gas discharge port E Engine B _L left bank (bank) B _R right bank (bank)

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI F02M 35/116 F02M 35/10 102X 102E (72) Inventor Hiroto Tsushima 1-4-1 Chuo, Wako-shi, Saitama Honda Motor Co., Ltd. In the laboratory (72) Inventor Katsuzo Noguchi 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside the Honda R & D Co., Ltd. (72) Inventor Shinzo Goto 1-4-1 Chuo, Wako-shi, Saitama Pref. In-house (56) References JP-A-61-43964 (JP, U) JP-A-3-25849 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02M 35/10 F01M 13 / 00

Claims (1)

(57) [Claims] 1. Both banks of a V-type multi-cylinder engine (E)
(B_L, B_RIn the meantime, downstream of the throttle body (22)
A pair of resonance knives connected to each other via an intake passage (23).
Chamber (28_L, 28_R) And both resonance chambers (2
8_L, 28_R) Curves upward from the top of both banks (B
_L, B_R) Cylinder (3_L, 3_RIntake connected to
And a manifold (26).
Member (28_L) Chamber side wall (30_L) To EGR
A gas discharge port (36) is opened and the EGR gas
The blow-by gas discharge port (5) is located upstream of the discharge port (36).
6) In the intake system of a V-type multi-cylinder engine with an opening
And one of the resonance chambers (28_L) Chamber bottom wall (3
7), located downstream of the blow-by gas discharge port (56)
And a partition wall facing the EGR gas discharge port (36).
(38) is erected, and one end of the partition (38) is connected to both resonance channels.
Chamber (28 _L, 28_R) Chamber partition
Connect to wall (29) and discharge EGR gas at the other end
EGR gas discharged from the port (36) is partitioned into chambers
To the communication hole (40) passing through the wall (29).
To the side approaching the EGR gas discharge port (36).
An intake device for a V-type multi-cylinder engine.