JP2930248B2 - Engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an intake air for an engine in which a group of independent intake passages extending from one bank of a V-type engine and a group of independent intake passages extending from the other bank are assembled. It concerns the device.

[Conventional technology]

Conventionally, in order to provide an effect of improving charging efficiency by resonance supercharging using a pressure wave of intake air, a portion of a V-type engine over a predetermined range of an intake system is assigned to an intake system corresponding to one bank and another bank. 2. Description of the Related Art An intake device formed separately from a corresponding intake system is known. For example, JP-A-62-1535
In the air intake device disclosed in Japanese Patent Application Publication No. 16-216, a surge tank having a relatively large capacity is vertically divided to form a first enlarged chamber and a second enlarged chamber, and an independent intake passage extending from one of the banks. The group and the independent intake passage group extending from the other bank are connected to the respective enlarged chambers, and a common intake passage for each bank is provided upstream of the surge tank and connected to an end of each enlarged chamber. The main intake passage has a structure in which a main intake passage is connected to a junction on the upstream side of both common intake passages.
According to this intake device, the cylinders belonging to the same bank do not have adjacent intake strokes, so the range extends from the independent intake passage corresponding to each bank to the confluence on the upstream side of each common intake passage through each expansion chamber. , An intake pressure wave is propagated, and a resonance effect is obtained in a predetermined engine speed range corresponding to the intake passage length in this range.

Further, in the device disclosed in this publication, the surge tank is left on one bank, and a group of independent intake passages extending from the one bank is connected to an enlarged chamber above the surge tank. Connected to the expansion chamber below the surge tank to avoid a sharp bend in each independent intake passage and make the lengths of the independent intake passages to the expansion chamber almost equal, while maintaining a compact layout. ing.

[Problems to be solved by the invention]

However, in the above device, upper and lower expansion chambers are formed by a surge tank having a relatively large volume and extending in the cylinder row direction, and the upstream ends of the individual passages in each independent intake passage group are fixed in each of the expansion chambers. Since the common intake passage is connected at intervals and at one end in the length direction of the enlarged chamber, the passage length from the independent intake passage through the enlarged chamber to the common intake passage is independent intake passage. Among the passages in the passage group, there is a difference between the passage connected to a position near one end of the enlarged chamber and the passage connected to a position near the other end. For this reason, there is a problem that the dynamic effect of the intake does not uniformly reach each cylinder. Further, when the independent intake passage groups are assembled on one bank in this way, there remains a problem in how to make the ignition plug disposed in this bank detachable and compact. It had been.

In view of such circumstances, the present invention seeks to convert the intake system including the independent intake passage groups extending from each bank and the portion where these are assembled together, and equalizes the passage length for each cylinder to achieve dynamic intake air intake. It is an object of the present invention to provide an intake device for an engine that can effectively exert an effect on each cylinder and that can draw out an intake system so as not to hinder attachment and detachment of a spark plug. Another object of the present invention is to improve intake air distribution to one bank and the other bank.

[Means for solving the problem]

According to a first configuration of the present invention, a first intake collecting portion in which a group of independent intake passages extending from one bank is assembled on one bank of a V-type engine and a group of independent intake passages extending from the other bank Are arranged, and the first and second intake manifolds are arranged so that independent intake passages are gathered together and directly connected to a common intake passage for each bank. And the first intake manifold and the second intake manifold are arranged vertically one above the other. Independent intake passage groups extend from inner sides of both banks, respectively. On the one bank, the intake manifolds are arranged on the bank inner side of the location of the spark plug plug hole.

Further, as another configuration of the present invention, a first type in which independent intake passage groups extending from one bank of a V-type engine are assembled.
And a second intake manifold in which independent intake passage groups extending from the other bank are gathered and arranged vertically, and each bank is connected to each of the intake manifolds and parallel to each other. The common intake passage is configured to change from a vertically arranged state to a horizontally arranged state as it goes from the downstream side close to the intake gathering section to the upstream side to reach the upstream merging portion, and to be upstream of the upstream merging portion. Is provided with a throttle valve rotatable around a valve shaft extending in the left-right direction.

[Action]

According to the first configuration, the two independent intake passage groups extending from the respective banks and the intake collecting portions each of which is assembled are compactly laid out, and both intake collecting portions have an enlarged chamber such as a surge tank. By having a structure in which the independent intake passages are gathered without using, the passage length for resonance from the independent intake passage to the upstream of the intake manifold is equalized for each cylinder of both banks. .

Further, since the intake manifolds are arranged on the bank inner side of the location where the plug hole for the ignition plug is arranged, the amount of protrusion of the intake system to the bank outside is reduced, which is advantageous for compactness. .

Further, according to the another configuration, the intake air passing through the throttle valve provided upstream of the upstream merging portion of the two common intake passages is evenly distributed to the two common intake passages.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

1 and 2 show the overall structure of an intake device according to one embodiment of the present invention. In these figures, reference numeral 1 denotes an engine body of a V-type engine, which has a pair of V-type banks 1a and 1b, and is constituted by a cylinder block 2 and a pair of cylinder heads 3 and 4. In this embodiment, the engine main body 1 is disposed horizontally in the engine room 6 below the hood 5 at the front of the vehicle, that is, the engine output shaft is arranged in the vehicle width direction. Is located behind the engine room 6 (closer to the passenger compartment), and the other bank 1b is located in front of the engine room 6.

Each of the banks 1a and 1b is provided with a plurality of cylinders. For example, in the illustrated V-type six-cylinder engine, both banks 1a and 1b are provided.
b is provided with three cylinders. One bank 1a
And the cylinders of the other bank 1b are arranged offset from each other in the engine output axis direction.

Reference numeral 10 denotes an intake manifold which includes two sets of independent intake passage groups 11 and 12 extending from the banks 1a and 1b, respectively. , Second intake collecting portions 13 and 14 are formed. In the illustrated V-type six-cylinder engine, the independent intake passage group 1
Each of the banks 1a, 1b is constituted by three independent intake passages corresponding to the cylinders of the banks 1a, 1b, and the downstream end of each of the banks 1a, 1b.
The b is connected to the inner wall surface (between banks) of the cylinder heads 3 and 4 and communicates with the intake ports formed in the cylinder heads 3 and 4.

Each of the intake collecting portions 13 and 14 does not have a large volume like a surge tank, and the independent intake passage groups 11 and 12 respectively gather together to form a common intake passage 3 for each bank described later.
The upstream side is gradually narrowed so as to be directly connected to 1,32. Each of the intake manifolds 13 and 14 has one bank located behind the engine room 6.
1a, and a collection portion (first intake collection portion) of a first independent intake passage group 11 extending from one bank 1a.
13 is a second independent intake passage group 12 extending from the other bank 1b.
The two intake manifolds 13 and 14 are vertically arranged so as to be positioned higher than the gathering section (second intake manifold) 14. That is, the second independent intake passage group 12 extends rearward from the bank 1b located on the front side of the engine room 6 and is gathered on the one bank 1a. The passages are alternately arranged with the passages of the second independent intake passage group 12 and extend upward from the one bank 1a in a state of intersecting with the passages, and rearward above the second independent intake passage group 12. They are gathered while bending.

The gathering position of the independent intake passage groups 11 and 12 is on the bank inner side of the position of the spark plug plug hole 15 provided in the one bank 1a. Then, upstream portions of the respective intake collecting portions 13 and 14 (common intake passages 31,
13a, 14a are two plug holes 15
, And is bent in the vehicle width direction outside of the plug hole 15 (rear when viewed from the vehicle).

The intake manifold 10 is attached to the engine body 1 with the stays 16 at the upstream sides of the intake manifolds 13 and 14 and the flanges 17 and 17 ′ provided at the downstream ends of the independent intake passage groups 11 and 12. The first independent intake passage group 11 is particularly composed of a downstream portion 11a and an upstream portion 1 in order to facilitate the assembly work.
1b is connected by fitting. That is, as shown in FIG. 3, the first independent intake passage group 11
Is a downstream portion 11a having a flange 17 and an upstream portion 11b
And the downstream side portion 11a is
The lower end of the upstream portion 11b is fitted into the upper end of the downstream portion 11a. Both parts 11a, 11b
An O-ring 18 is provided between the peripheral surfaces of the
An anti-vibration rubber 19 is interposed between the upper end surface of 11a and the flange portion of the upstream portion 11b opposed thereto.

An intake pipe 30 for forming a common intake passage, which will be described in detail later, is connected to the upstream end side of the intake manifold 10. The intake manifold 10 is provided with a communication passage that is opened and closed by a valve in order to make the effective intake pipe length for resonance variable. In the example shown in FIG. 1, a pair of upper and lower short passage portions 21 are provided which protrude laterally from the intake manifolds 13 and 14 of the intake manifold 10, and an open / close valve 22 is provided between these passage portions 21. By forming the communication hole, a communication path for a high-speed range is formed. Further, a passage portion 23 that communicates with the pair of upper and lower passage portions 21 and extends in the lateral direction from the rear and has a leading end connected in a U-shape.
A communication passage for the medium speed range is formed by a range extending from the passage portion 21 to the passage portion 23, and an opening / closing valve 24 is provided in the middle of the passage portion 23. The opening / closing valves 22, 24 are operated by actuators 25, 26, respectively, and the actuators 25, 26 respond to a negative pressure supplied via, for example, an electromagnetic valve (not shown). Then, by a control signal according to the operating state given to the solenoid valve and the like, both the on-off valves 22 and 24 are closed in a low speed range of the engine, only the on-off valve 24 is opened in a middle speed range, and both open and close valves are opened in a high speed range. The opening / closing valves 22, 24 are opened.

An intake pipe connected to the upstream side of the intake manifold 10
30 is a first and a first communicating with the respective intake collecting units 13 and 14, respectively.
Common intake passages 31 and 32 for each second bank are integrally provided. The intake pipe 30 has a downstream end connected to the intake manifold 10 at a rear portion of the engine 1,
The engine 1 is bent at one side in the vehicle width direction, and the upstream side extends forward. Both intake passages 31, 3 of the intake pipe 30
2 is the intake manifold 1 of the intake manifold 10 on the downstream end side
Although they are arranged vertically corresponding to 3,14, they are formed in a mutually twisted arrangement so as to be arranged sideways toward the upstream side.

At the upstream end of the intake pipe 30, the common intake passages 31, 3
2 is connected to a junction portion 33, which is further connected to a throttle body 34 containing a throttle valve 35.
Are connected. The merging portion 33 and the throttle body 34 are located in the vicinity of the space between the banks 1a and 1b, and are connected to the engine hanger 36. The throttle valve 35 is rotatable about a horizontal axis, and rotates in response to an accelerator operation. The merging portion 33 is also provided with a downstream end 37 of an ISC passage that bypasses the throttle valve 35, a purge inlet 38, an EGR inlet 39, a blow-by gas inlet 40, and the like. 41 is an EGR valve and 42 is an EGR passage. The above throttle body 3
An upstream intake pipe (not shown), an air cleaner, and the like are connected to the upstream side of (4).

According to the apparatus of the present embodiment as described above, when the on-off valves 22 and 24 are closed, the independent intake passage groups 11 and 12 extending from the banks 1a and 1b and the respective intake collecting sections 13 and 14 and A pressure wave is propagated over the common intake passages 31, 32, and a resonance supercharging effect is obtained in a low speed range. In other words, the intake strokes of the cylinders arranged in one bank 1a of the V-type engine are not continuous, and the intake strokes of the cylinders arranged in the other bank 1b are not continuous. A pressure wave generated in each cylinder of the bank 1a of the first independent intake passage group 1
1, the pressure wave generated in each cylinder of the other bank 1b passes through the intake manifold 13 and the common intake passage 31, and passes through the second independent intake passage group 12, the intake manifold 14, and the common intake passage 32, respectively. It reaches the junction 33 upstream of the common intake passage. In this way, the propagation of the pressure wave is performed in a sufficiently long passage to the junction, so that a resonance supercharging effect can be obtained in a low speed region of the engine. Further, when the opening / closing valve 24 is opened, the above-mentioned intake manifolds 13 and 14 are communicated through the passages 21 and 23, so that the pressure wave propagation path extends to the passages 21 and 23. The effective path length of the pressure propagation is shortened, and the resonance supercharging effect is obtained in the middle speed range of the engine. Further, when the opening / closing valve 22 is opened, the intake manifolds 13 and 14 are short-circuited in the passage portion 21 to further shorten the effective passage length of the pressure propagation. The effect is obtained.

In order to provide the above-described dynamic effect of intake, the independent intake passage group 11 corresponding to one bank 1a and the other bank 1b
And the independent intake passage group 12 corresponding to. And, above each bank 1a, the above-mentioned intake manifolds 13 and 14 are arranged so as to be vertically overlapped, and these intake manifolds 13 and 14 and the independent intake passage groups 11 and 12 are compactly laid out. , The horizontal section of the engine 1 on the bank 1a located behind the engine room 5
By installing 3,14, the bonnet 5 descending forward
The layout conforms to this line.

Moreover, since the first intake manifold 13 is located above the second intake manifold 14 in one of the banks 1a, each of the independent intake manifolds from each bank 1a, 1b to the intake manifold 13, 14 is provided. The passage groups 11 and 12 do not bend sharply, which is advantageous for smooth intake air flow.
The difference in the passage length between the independent intake passage group 11 and the second independent intake passage group 12 can be kept sufficiently small. In addition, since the intake manifolds 13 and 14 in which the passages of the independent intake passage groups 11 and 12 are gathered without the surge tank are formed in the above arrangement, the independent intake passages are separated from the independent intake passages. Air intake assembly 13,1
It is possible to avoid a difference in passage length between the cylinders in a range from the route 4 to the common intake passages 31 and 32 for each bank. Accordingly, both the difference in the passage length within the group belonging to the same bank and the difference in the passage length between the two groups belonging to the different banks are sufficiently reduced, and the resonance supercharging effect is equally applied to each cylinder. Become.

Thus, on one bank 1a, each independent intake passage group 11, 1
When the two are assembled, each independent intake passage group 1 avoids the plug hole 15 so that the spark plug can be attached and detached.
It is necessary to gather the intake manifold 1 and 12 on the outside (rear side) of the bank from the plug hole 15.
Although it is conceivable to dispose the intake ports 3 and 14, the upstream portion of the intake collecting sections 13 and 14 protrudes greatly to the rear of the bank 1a. On the other hand, if the intake collecting portions 13 and 14 are arranged closer to the inside of the bank than the plug hole 15 as in this embodiment, the amount of protrusion of the intake system to the rear of the bank 1a is reduced, thereby reducing the size. To be effective,
This is also advantageous in terms of collision safety.

In addition, each independent intake passage group 11, 12 and each intake collecting section 13,
With the arrangement structure of 14 as described above, the second independent intake passage group 12 crosses directly above the downstream end flange portion of the first independent intake passage group 11, and in this state, the first independent intake passage group 12 Although it is difficult to connect the downstream end of the independent intake passage group 11 to the cylinder head 3 by bolting, etc.
The independent intake passage group 11 has a downstream portion 11a and an upstream portion 1 in advance.
1b, the assembly work can be easily performed. That is, in assembling, first, the first independent intake passage group 11
Is connected to the cylinder bed 3 so that the bolt work is performed without being obstructed by the second independent intake passage group 12 or the like. Thereafter, the upstream portion 11b of the independent intake passage group 11 is fitted into the downstream portion 11a, the downstream end of the second independent intake passage group 12 is connected to the cylinder head 4, and the stay 16 and the engine By attaching predetermined locations such as the intake manifold 10 and the intake pipe 30 to the hanger 36, the entirety of the engine body 1
Will be assembled. In addition, the vibration isolation rubber 19 is interposed between the downstream portion 11a and the upstream portion 11b of the first independent intake passage group 11, whereby
These portions 11a and 11b are securely fitted together while preventing transmission of vibration between 11a and 11b.

The common intake passages 31, 32, which are connected upstream of the intake manifolds 13, 14 of the intake manifold 10, are arranged vertically on the downstream side corresponding to the intake manifolds 13, 14, but left and right on the upstream side. In this case, even when the throttle valve 35 is disposed upstream of the arrangement, the distribution of intake air and the like is improved. That is, in the figure, the throttle valve 35
Is provided only upstream of the merging portion 35 and is rotatable about a horizontal axis so as to operate smoothly so that the structure is more advantageous than in the case where the common intake passage is individually provided. It is said that the throttle valve 35
If the common intake passages 31 and 32 are arranged vertically even on the upstream side, the throttle valve
The intake air flowing to the upper passage through 35 and the intake air flowing to the lower passage tend to be uneven. On the other hand, when the common intake passages 31 and 32 are arranged right and left on the upstream side as in the present embodiment, the intake air passing through the throttle valve 35 is supplied to each common intake passage 3.
Equally distributed to 1,32. Further, the EGR, blow-by gas, etc. introduced into the confluence portion 33 are also connected to the common intake passages 31, 32.
Will be evenly distributed.

〔The invention's effect〕

As described above, according to the present invention, each of the independent intake passage groups extending from each bank of the V-type engine is gathered on one bank, and the first intake gathering portion corresponding to the one bank and the other bank correspond to the other bank. The second intake collecting portion is vertically overlapped with each other, and each of these intake collecting portions has a structure in which independent intake passage groups are gathered together and directly connected to a common intake passage for each bank. Therefore, while reducing the size of the intake system, ensure a sufficient passage length to provide a resonance effect in the range from each intake collecting section to the upstream of each collecting section, and make the passage length for each cylinder in each bank. The resonance effect can be effectively exhibited by equalizing.

In addition, since the independent intake passage groups extending from the respective inner portions of both banks are arranged so as to be gathered on the bank inner side with respect to the location of the spark plug plug hole on one bank, the ignition plug The protrusion of the intake system to the outside of the bank is reduced while preventing the attachment and detachment from being hindered, and the effect of compactness is enhanced.

In addition, two intake manifolds in which independent intake passage groups each extending from each bank are gathered are arranged so as to be vertically overlapped with each other, and a common intake passage for each bank connected to the two intake manifolds and parallel to each other is provided. As it goes from the downstream side close to the intake collecting section to the upstream side, it changes from a vertically arranged state to a horizontally arranged state to reach an upstream merging section, and a throttle valve is arranged upstream thereof. Therefore, while being compact, the intake air and the like sent from the upstream side to the common intake passage for each bank are equally distributed to the common intake passage corresponding to one bank and the common intake passage corresponding to the other bank. Thus, the distribution of intake air and the like to the cylinders of each bank can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an entire intake device showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view of the intake device, and FIG. 3 is a partially enlarged side view of an independent intake passage group extending from one bank. FIG. 1 ... Engine main body, 1a, 1b ... Both banks, 11, 12 ... Independent intake passage group, 13, 14 ... Intake collecting part, 15 ... Plug hole, 31, 32 ... Common intake passage.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-91621 (JP, A) JP-A-63-117156 (JP, A) Japanese Utility Model Application No. Sho 62-122163 (JP, U) Japanese Utility Model Utility Model No. 2- 74561 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02B 27/00 F02M 35/116

Claims (2)

(57) [Claims] A first group of independent intake passages extending from one bank on one bank of a V-type engine;
And a second intake manifold in which independent intake passage groups extending from the other bank are arranged.
The second and the second intake manifolds have a structure in which independent intake passage groups are gathered together and are directly connected to a common intake passage for each bank, and the first intake manifold and the second The intake collecting portion is vertically overlapped with each other. Independent intake passage groups extend from the inner portions of the two banks, respectively. An intake device for an engine, wherein the intake members are arranged on an inner side. 2. A first intake manifold in which independent intake passage groups extending from one bank of a V-type engine are gathered, and a second intake manifold in which independent intake passage groups extending from the other bank are gathered. A common intake passage for each bank, which is arranged vertically and connected to both intake manifolds and parallel to each other, is lined up and down from left to The throttle valve is configured to change to a lined state and reach an upstream merging portion, and a throttle valve rotatable around a valve shaft extending in the left-right direction is arranged upstream of the upstream merging portion. Engine intake device.