JPH04171219A - Engine suction device - Google Patents

Abstract

PURPOSE:To intend a compact layout of a suction system which can be mounted in an engine room in a good fashion by bending a suction pipe toward between banks to arrange the upstream end of the suction pipe and a throttle body connected thereto near a space between the banks. CONSTITUTION:A suction pipe 30 connected to a suction manifold 10 is provided with common suction passages 31, 32 for each of banks communicating with suction gathering portions 13, 14, respectively. It has the downstream end connected to the suction manifold 10 on the outside (rear side) of one bank 1a, being bent from this point through one end in the cylinder arrangement direction of the bank 1a so that the upstream may tend to between the banks. The combined portion 33 and a throttle body 34 are arranged near a space between both banks 1a, 1b. In this way, a suction system can be assembled in a compact layout and mounted in an engine room in a good fashion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is directed to a V-type engine in which a group of independent intake passages extending from one bank and a group of independent intake passages extending from the other bank are assembled, The present invention relates to an intake system for an engine in which intake pipes having a common intake passage for each bank are connected.

[Conventional technology]

Conventionally, in order to achieve effects such as improving charging efficiency through resonant supercharging using pressure waves in the intake air, a section of the intake system of a ■-type engine that spans a specified range is divided into an intake system corresponding to one bank and another bank. An intake device is known that is formed separately from a corresponding intake system. For example, JP-A-62-15
In the intake system disclosed in Publication No. 3516, a surge tank with a relatively large capacity is partitioned into an upper and lower part to form a first enlarged chamber and a second enlarged chamber, and an independent intake passage extending from one bank. A bank and an independent intake passage group extending from the other bank are connected to each of the expansion chambers, and a common intake passage for each bank is provided on the upstream side of the surge tank and continues to the end of each expansion chamber. The main intake passage is connected to the upstream confluence of both common intake passages. According to this intake system, since the intake strokes of cylinder groups belonging to the same bank are not adjacent to each other, the range extends from the independent intake passage corresponding to each bank, through each expansion chamber, to the upstream confluence of each common intake passage. The intake pressure wave is propagated in this range, and a resonance effect is obtained in a predetermined engine speed range corresponding to the intake passage length within this range.

Furthermore, the device disclosed in this publication arranges the surge tank on one bank, connects a group of independent intake passages extending from this one bank to an enlarged chamber above the surge tank, and connects a group of independent intake passages extending from this one bank to an enlarged chamber above the surge tank. By connecting the above to the enlarged chamber at the bottom of the surge tank, the independent intake passage group can be laid out compactly, avoid sharp bends in each independent intake passage, and reduce the length of the independent intake passage to the enlarged chamber. I try to make it almost even.

[Problem to be Solved by the Invention] By the way, in the above-mentioned intake system, in order to have an effective resonance effect even in the relatively low-speed operating range a, it is necessary to create a passage from each independent intake passage group to a common intake passage for each bank. In particular, since there are restrictions on the passage length of the independent intake passage group due to layout etc., it is necessary to ensure a sufficient length of the common intake passage for each bank. However, if the intake pipe that makes up the common intake passage and the throttle body connected to the upstream side of the intake pipe protrude significantly outside the engine body, it will hinder the compactness of the intake system and make it difficult to install it in the engine room. Such problems remained.

In view of these circumstances, the present invention provides a structure in which an intake pipe having a common intake passage for each bank is connected to the upstream side of a part where groups of independent intake passages extending from each bank are assembled. An object of the present invention is to provide an engine intake system that allows the intake system to be compactly assembled to a V-type engine while ensuring sufficient length, and that improves ease of installation in the engine room. shall be.

(Means for Solving the Problems) In order to achieve the above objects, the present invention provides an independent intake passage group extending from one bank of a V-type engine and an independent intake passage group extending from the other bank on one bank of a V-type engine. The intake pipes have a common intake passage for each bank that communicates with each collection part of these independent intake passages, and are connected to the upstream side of the collection part. The upstream end of this intake pipe and the throttle body connected thereto are arranged near the space between the banks. It is something.

In this configuration, each cylinder of the one bank is arranged offset to one side in the cylinder row direction with respect to each cylinder of the other bank, and the intake pipe is connected from an outer side of the one bank to this bank. It is preferable that the cylinder be bent so as to pass through the end opposite to the cylinder offset side and toward the inter-bank side.

[Effect]

According to the above configuration, the collective portion of each independent intake passage group is arranged compactly on one bank, and each common intake passage has a sufficient length and is arranged near the bank, and The upstream end portion of the intake pipe and the throttle body are also located near the space between the banks, so that they are arranged close to the banks.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

1 and 2 show the overall structure of an intake device according to an embodiment of the present invention. In these figures, 1 is V
It is an engine body of a type engine, and has a pair of banks 1a and 1b arranged in a ■ type, and has a cylinder block 2.
and a pair of cylinder heads 3.4. In this embodiment, the engine body 1 is placed horizontally in an engine room 6 below a hood 5 at the front of the vehicle, that is, placed so that the direction of the engine output shaft is in the vehicle width direction; One bank 1a is located on the rear side of the engine room 6 (closer to the passenger compartment), and the other bank 1b is located on the front side of the engine room 6.

Both banks 1a and 1b are each provided with a plurality of cylinders. For example, in the illustrated V-type 6-cylinder engine, both banks 1a and 1b are provided with a plurality of cylinders.
Three cylinders are provided in each of a and lb. The cylinders in one bank 1a and the cylinders in the other bank 1b are arranged offset from each other in the direction of the cylinder rows. Each cylinder of bank 1a is arranged offset to the left with respect to each cylinder of the other bank 1b.

10 is an intake manifold, each bank 1a, 1b
Two sets of independent intake passage groups 11.12 are provided, each extending from the air intake passage, and these two sets of independent intake passage groups 11.12 are assembled on the upstream side to form two intake collection portions 13.14. In the illustrated V-type 6-cylinder engine, the independent intake passage groups 11 and 12 are composed of three independent intake passages corresponding to the cylinders of each bank Ia and 1b, and each downstream end is connected to the cylinder of each bank 1a and 1b. It is connected to the wall surface of the inner side (the side between banks) of the heads 3, 4, and communicates with an intake boat formed in the cylinder head 3.4.

Each of the above-mentioned intake collecting parts 13.14 does not have a large volume like a surge tank, but each of the independent intake passage groups 11.12 is gathered together on the upstream side, and a common intake passage 31 for each bank, which will be described later, It has a shape that gradually narrows on the upstream side so that it directly connects to .32. These air intake collecting parts 13 and 14 are integrally formed so as to overlap vertically with a partition wall in between, and are arranged on one bank 1a located on the rear side of the engine room 6. The independent intake passage group 12 extending rearward from the front bank 1b is connected at its upstream end to the lower intake collecting section 14, and the independent intake passage group 11 extending upward from the rear bank 1a is Each of the passages is arranged alternately with each passage of the independent intake passage group 12 and intersects with the passages, bent rearward above the independent intake passage group 12 and connected to the upper intake collecting section 13. . With this structure, the lengths of the independent intake passages are equalized.

The upstream portions 13a and 14a of the intake air gathering portions 13 and 14 in the intake manifold 10 extend to the outer side of the one bank 1a (the side opposite to the inter-bank side), and in this outer side, the It is bent in the direction, that is,
In the horizontal engine of this embodiment, the intake collecting section 13
．． An upstream portion 138.14a of the bank 14 is bent toward one side in the vehicle width direction at the rear side of the engine, which is the outer side portion of the one bank 1a. Furthermore, this part 138.
14a is attached to the engine body 1 by a stay 16, and an intake pipe 30 for forming a common intake passage, which will be described in detail later, is connected to this portion 138.14a. Further, 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 that project laterally from both intake collecting portions 13, 14 of the intake manifold 10, and an on-off valve 22 is provided between these passage portions 21. By forming the communication hole, a communication path for a long distance is configured. Furthermore, the above-mentioned pair of upper and lower passage portions 21
A passage portion 23 is provided which extends from the rear to the side and has a U-shaped tip that communicates with the passage portion 23. An on-off valve 24 is provided in the middle. Each of the on-off valves 22.24 is operated by an actuator 25.26, and each actuator 2
5.26 responds to negative pressure supplied via, for example, a solenoid valve (not shown). Then, in response to a control signal given to the solenoid valve, etc. according to the operating state, both the on-off valves 23 and 24 are closed in the low speed range of the engine, only the on-off valve 24 is opened in the middle speed range, and in the far range. Double open/close valve 2
3 and 24 will be held.

Each independent intake passage group 1 of the intake manifold 10
1.12 is made of aluminum alloy to reduce weight, etc., and the portions constituting the intake collecting portions 13.14 are made of cast metal to ensure ease of manufacture and rigidity.

The intake pipe 30 connected to the intake manifold 10 is
It is integrally equipped with a common intake passage 31.32 for each bank that communicates with each intake collecting part 13.14, and is made of aluminum alloy, and the downstream end side is the outer side (rear side) of the one bank 1a. It is connected to the manifold 10, passes through one end of the bank 1a in the cylinder arrangement direction, and is bent so that the upstream side is directed toward the inter-bank side. In this embodiment, as a particularly desirable layout, if the cylinders of one bank 1a are offset to the left in the figure, as shown in FIG. At the same time, the upstream portions 13a and 14a are bent to the right at the outer side of the bank 1a, and the intake pipe 30 is connected to this, so that the intake pipe 30 is opposite to the cylinder offset side of one bank 1a. It is configured to pass through the side and head toward the puncture side. A merging portion 33 communicating with the common intake passage 31, 32 is connected to the upstream end of the intake pipe 30, and a throttle body 34 is connected to the merging portion 33. A throttle valve 35 is housed in the throttle valve 35, which is rotatable about a shaft and is interlocked with an accelerator pedal (not shown).

The merging portion 33 and the throttle body 34 are arranged near the space between both banks 18.1b. Then, on the engine hanger 36 provided on the engine body 1 for suspending the engine when the engine is mounted, etc.
The above-mentioned merging portion 33 is connected.

Furthermore, the intake pipe 30 is configured such that the intake air passing through the throttle valve 35 evenly flows into the common intake passage 31,32.
On the upstream side, both common intake passages 31 and 32 are lined up side by side, and on the downstream end side, both intake manifolds 10 have both intake collecting portions 13.1.
Both the common intake passages 31.32 are formed in a mutually twisted shape so that the common intake passages 31.32 are arranged vertically corresponding to the figure 4.

In addition, a blowby gas inlet 37 that communicates with a blowby gas passage (not shown), an EGR inlet 40 that communicates with an EGR passage 39 connected to an EGR valve 38, and a barge (evaporated fuel) are introduced into the confluence portion 33. Purge inlet 4
1 and an air inlet 42 that communicates with an ISC passage 44 that bypasses the throttle valve 35 and an air passage 46 are open. In the EGR valve 38, the upstream portions 13a and 14a of the intake manifold 10 are connected to the stay 16.
The engine body 1 is attached to a portion supported by the engine body 1 via a bracket. Note that an upstream intake pipe, an air cleaner, etc. (not shown) are connected to the upstream side of the throttle body 34.

According to the device of this embodiment as described above, each independent intake passage group 11.12, each intake collecting section 13.14, and each common intake passage 31.32 constitute two intake systems for each bank. A supercharging effect is obtained by resonance depending on the operating state between the two.

That is, since the intake strokes of the cylinders disposed in one bank 1a and the cylinders disposed in the other bank 1b of the V-type engine are not consecutive, the opening and closing pulp 22. 24 is closed, the pressure waves generated in each bank 1a, 1b pass from the independent intake passage group 11.12, through each intake collecting section 13.14 and each common intake passage 31.32, and then to the confluence section 33 upstream thereof. It is propagated over a wide range. In this manner, the pressure waves propagate in the long path up to the merging portion 33, thereby providing a resonant supercharging effect in the low speed range of the engine. Furthermore, when the on-off valve 24 is opened, the above-mentioned intake collecting parts 13.14 are communicated via the passage 1121.23, so that the propagation path of the pressure wave is up to the passage part 21.23, and the pressure The effective path length of propagation is shortened, and a resonant supercharging effect can be obtained in the mid-speed range of the engine. Furthermore, when the opening/closing pulp 22 is opened, the above-mentioned intake collecting parts 13 and 14 are short-circuited at the passage part 21, and the effective passage length for pressure propagation is further shortened, so that resonance is caused in the high-speed region of the engine. You can get the effect of supply.

In this way, resonance effects can be obtained in various rotation speed ranges. In particular, since the intake pipe 30 having the common intake passages 31 and 32 for each bank extends from the outer side of one bank 1a to the vicinity between the banks through one end of this bank 1a in the cylinder arrangement direction, A sufficient length of the common intake passages 31, 32 is ensured to provide a resonance effect in the low speed range. However, since this intake pipe 30 is bent along the bank 1a, and the confluence part 33 and throttle body 34 on the upstream end side are arranged near the space between the banks, the outer wall of the bank and The upstream end side of the intake pipe 30 can be placed sufficiently close to the bank while avoiding interference between the banks. can be placed close to. Therefore, the intake pipe 30, the confluence part 33 connected to the upstream side thereof, and the throttle body 3
4, the outward protrusion of the bank is kept small, resulting in a compact layout.

Furthermore, if the intake pipe 30 is arranged so as to go around the end of the bank 1a opposite to the cylinder offset side and reach the inter-bank side, each cylinder will have its own spark plug, intake and exhaust gas. Since the intake pipe 30 is arranged so as to pass through the end of the bank on the side where there is more space than the arrangement of the valves, etc., the layout becomes more advantageous for compactness.

Further, in this embodiment, the independent intake passage group 11.12 and the intake pipe 30 are made of aluminum alloy, while the part constituting the intake gathering part 13.14 and the upstream merging part of the intake pipe 30 are made of cast metal. 33 is supported on the engine body 1 by the stay 16 and the engine hanger 36, the mounting rigidity is ensured, and furthermore, the EGR valve 3 is attached to the less rigid part supported by the stay 16.
8 ensures the reliability of the EGR valve 38.

It is effective to provide the blow-by gas inlet 37, the EGR inlet 40, the purge inlet 41, and the air inlet 42 at the confluence section 33 upstream of the intake pipe 30 in the arrangement shown in FIG. That is, for example, each intake collecting section 13.
If the inlet for blow-by gas etc. is opened at 14,
Inlet collecting section 13.14 through a passage leading to its inlet
Since the resonance effect may be inhibited due to the communication between the intake passages 31 and 32, it is desirable that each inlet is provided at the confluence section 33 upstream of the common intake passage 31, 32. In this case, as shown in FIG.
0, 41, 42, gas, air, etc. to be introduced will be almost equally supplied to each common intake passage 31, 32.

Among these inlets, it is advantageous to provide the air inlet 42 upstream of the merging portion 33 in order to improve air distribution to the common intake passages 31 and 32; blow-by gas inlet 37 and EGR inlet 40 to prevent oil mist from adhering to
It is advantageous to keep the gas away from the throttle valve 35, and between blow-by gas and EGR, EGR has a stronger demand for improved distribution. Due to these circumstances, it is desirable that the air inlet 42, purge inlet 41, EGR inlet 40, and blow-by gas inlet 37 be arranged in this order from the upstream side.

Note that the air inlet 42 is connected to an ISO passage 44 through which air regulated by an ISO valve 43 flows during idle, etc., and an air passage 46 through which air flows through an air valve 45 when an external load is applied, etc. The ISC valve 43 and air valve 45 are provided below the throttle body 34. When providing the air inlet 42 etc. in this way, if the air inlet is opened at the bottom of the intake passage as is conventionally known, oil and water that accumulates in the intake passage downstream of the throttle valve can be removed from the air inlet. There is a risk that the valves 43, 45 may malfunction. Therefore, in order to prevent the intrusion of water, etc., an air inlet 42 is installed at the upper part of the merging section 33, as shown in FIG.
At the same time, passages 44 and 46 are formed in the flange 47 at the joint portion of the merging portion 33 and the throttle body 34 in the circumferential direction so as to pass around the intake passage hole 48 from below and reach the air inlet 42. It is desirable to form it.

C Effects of the Invention] As described above, the present invention has two independent intake passage groups corresponding to each bank assembled on one bank of a V-type engine, and separate intake passages for each bank that communicate with each of the collective parts. An intake pipe having a common intake passage is bent from the outer side of the one bank to the one end of the bank in the cylinder arrangement direction toward the interbank side, and the upstream end of the intake pipe and the Since the connected throttle bodies are arranged near the space between the banks, a sufficient length of the common intake passage is ensured so that an effective resonance effect can be obtained. The intake system including the throttle body etc. can be laid out compactly near the bank. Therefore, it is easy to install in the engine room.

Furthermore, in such a configuration, if the intake pipe is bent from the outer side of the one bank to the end of the bank opposite to the cylinder offset side toward the interbank side, The intake pipe is located on the side opposite to the cylinder offset side, where there is plenty of space.
This makes it possible to obtain an even more compact layout.

[Brief explanation of drawings]

Fig. 1 is a plan view of the entire intake device showing one embodiment of the present invention, Fig. 2 is a partially cutaway side view of the same device, and Fig. 3 is the arrangement of air inlets, etc. at the confluence section on the upstream side of the intake pipe. It is a figure showing an installation part. 1... Engine body, Ia, Ib... Bank, 10
...Intake manifold, 11.12...Independent intake passage, 13.14...Intake gathering part, 30...Intake pipe,
31° 32... Common intake passage, 33... Merging part,
34...Throttle body.

Claims (1)

[Claims] 1. On one bank of a V-type engine, a group of independent intake passages extending from the one bank and a group of independent intake passages extending from the other bank are assembled, and these independent intake passages An intake pipe, which has a common intake passage for each bank and is connected to the upstream side of the collecting part, passes from the outer side of the one bank to one end of the bank in the cylinder arrangement direction. An intake system for an engine, characterized in that the upstream end portion of the intake pipe and the throttle body connected to the upstream end portion of the intake pipe are arranged near the space between the banks. 2. Each cylinder of the one bank is arranged offset to one side in the cylinder row direction with respect to each cylinder of the other bank, and the intake pipe is connected to the cylinders of this bank from the outer side of the one bank. An engine intake device characterized by being bent so as to pass through an end opposite to an offset side and toward an inter-bank side.