JPH03124915A - Intake device of engine - Google Patents

Abstract

PURPOSE:To enhance the freedom of an intake system layout and make the bends in independent intake passages from respective cylinders smooth by disposing surge tanks for three banks of cylinders above the middle bank. CONSTITUTION:In a W-type 12-cylinder engine 10, surge tanks 96, 102, 108 for independent intake passages 94 - 94, 100 - 100, 106 - 106 of a front bank 14, a middle bank 16, and a rear bank 18 respectively are disposed above the middle bank 16, with the surge tanks 96, 102, 108 neighboring each other. This enhances the freedom of the intake system layout, eliminates the need for forc ibly bending the independent intake passages 94 - 94, 100 - 100, 106 - 106 for their layout, and intake resistance is reduced by smoothly bending the intake passages, so as to increase engine output.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to an intake system for an engine.

1. Conventional technology” Conventionally, in order to increase the output of an engine,
The number of cylinders is increasing. However, when a large number of cylinders are arranged in series in the direction of the crankshaft, the length of the engine in the direction of the crankshaft becomes long, and therefore the overall size of the engine increases.

Therefore, there is a V-type engine in which two banks are arranged at a predetermined angle to each other in the crankshaft direction, and cylinders are arranged in each bank. In such a V-type engine, the length of the engine in the crankshaft direction can be shortened, thereby making it possible to downsize the entire engine.

However, in the V-type engine, if the number of cylinders increases further, there is a limit to the length of the engine in the crankshaft direction.

Therefore, a W-type engine was developed in which three cylinders were arranged in the direction of the crankshaft and at a predetermined angle to each other, and a cylinder was arranged in each bank. W like Kono
In a type engine, even if the number of cylinders increases, the length of the engine in the crankshaft direction can be shortened.
This allows the entire engine to be downsized.

For such a W-type engine, see, for example, US Pat. No. 2,722,923.

"Problems to be Solved by the Invention" In the W-type engine described above, in each bank, a plurality of cylinders are connected to a surge tank via respective independent intake passages.

In conventional engine intake systems, the surge tank and independent intake passages are forced to be placed around the engine, so the independent intake passages from each cylinder to the surge tank have a tight bend. Resistance increases and engine power decreases.

The purpose of the present invention is to increase the degree of freedom in the layout of the intake system,
An object of the present invention is to provide an intake device for an engine that can reduce intake resistance and improve engine output by smoothing the bends of independent intake passages from each cylinder.

"Means for Solving the Problems" The present invention provides an intake system for a carrot including three banks arranged in the direction of the crankshaft and at a predetermined angle to each other, each bank having a plurality of cylinders. In each of the banks, a plurality of cylinders are connected to a surge tank through respective independent intake passages, and the surge tanks for the three banks are arranged above the intermediate bank.

"Function" In the present invention, the surge tanks for the three banks are arranged above the intermediate bank to increase the degree of freedom in the layout of the intake system and to smooth out the curves of the independent intake passages from each cylinder. ing.

"Embodiments" Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

1 shows a front cross-section of an engine intake system according to a first embodiment of the invention, FIG. 2 a schematic plan view of the device of FIG. 1, and FIG. , the intake and exhaust system of the engine of FIG. 1 is shown in plan view.

In Figure 1.2.3, the reference numeral 10 indicates a W-type 12-cylinder engine, and the reference numeral 12 indicates a bonnet, so the engine 10 is placed horizontally with respect to the vehicle body. (So-called horizontal engine). The engine 10 is
three banks arranged in the direction of the crankshaft 13 and at a predetermined angle (for example, 60 degrees) to each other;
That is, it includes a front bank 14, an intermediate bank 16, and a rear bank 18. Note that the intermediate bank 16 has its center line L.
1 is not arranged vertically, but is inclined toward the rear of the vehicle relative to the vertical line L2. Therefore, the engine 10 as a whole is arranged inclined toward the rear of the vehicle.

Each bank 14.16.18 comprises four cylinders, i.e. the front bank 14 has four cylinders 202.20.
．． Similarly, the intermediate bank 16 comprises: 20.20;
It comprises cylinders 22.22.22.22 and similarly the rear bank 18 comprises cylinders 24.24.24.24.

The front bank 14 includes a cylinder block 26 and a cylinder head 28 coupled to the upper surface of the cylinder block 26. The cylinder head 28 is formed with intake ports 32 to 32 and exhaust ports 34 to 34 that open into the combustion chambers 30 to 30 of each cylinder.
~ 32 and exhaust ports 34 ~ 34 are respectively connected to the intake valve 3
Opening and closing are controlled by exhaust valves 6 to 36 and exhaust valves 38 to 38.

Note that the intake ports 32-32 are provided with fuel injection valves 40-40, respectively. In addition, codes 42 to 42
indicates a piston, and numerals 44 to 44 indicate spark plugs.

Similarly, the intermediate bank 16 is connected to the cylinder block 46
, and a cylinder head 48 coupled to the upper surface of the cylinder block 46.

The cylinder head 48 includes intake ports 52 to 52 that open into the combustion chambers 50 to 50 of each cylinder, and an exhaust port 54.
- 54 are formed, and intake boats 52 - 52 and exhaust ports 54 - 54 are connected to intake valves 56 - 56 and exhaust valve 5, respectively.
Opening/closing is controlled by 8 to 58. Note that the intake port 52
-52 are provided with fuel injection valves 60-60, respectively.

Note that numerals 62 to 62 indicate pistons, and numerals 64 to 62 indicate pistons.
64 indicates a spark plug.

Similarly, the rear bank 18 is connected to the cylinder block 66
, and a cylinder head 88 coupled to the upper surface of the cylinder block 6B.

The cylinder head 68 includes intake ports 72 to 72 that open into the combustion chambers 70 to 70 of each cylinder, and an exhaust port 74.
-74 are formed, and intake ports 72-72 and exhaust ports 74-74 are respectively formed with intake valves 76-76 and exhaust valve 7.
The opening/closing is controlled by 8 to 78. Note that the intake port 72
-72 are provided with fuel injection valves 80-80, respectively.

Note that numerals 79 to 79 indicate pistons, and numerals 81 to 79 indicate pistons.
81 indicates a spark plug.

In addition, in the front bank 14, the exhaust ports 34 to 34
is the exhaust manifold 84 via the exhaust passages 82 to 82.
It is connected to the. Similarly, in intermediate bank 16, exhaust ports 54-54 are connected to exhaust manifold 88 via exhaust passages 86-86. Similarly, in rear bank 18, exhaust ports 74-74 are connected to exhaust manifold 92 via exhaust passages 90-90.

Next, in the front bank 14, the intake ports 32 to 32
is connected to the surge tank 96 via the independent intake passages 94 to 94.
It is connected to the. Note that the intake of air into the surge tank 96 is controlled by a throttle valve 98 provided at the intake port to the surge tank 96 .

Similarly, in the middle bank 16, the intake port 52
-52 are connected to the surge tank 102 via independent intake passages 100-100.

Note that the air intake to the surge tank 102 is from the surge tank 1.
It is controlled by a throttle valve 104 located at 0.02.

Similarly, in the rear bank 18, the intake port 72
-72 are connected to the surge tank 108 via independent intake passages 106-106.

Note that the intake air to the surge tank 108 is from the surge tank 1.
It is controlled by a throttle valve 110 provided at the inlet to 08.

The front bank 94, the middle bank 16, and the rear bank 18
Independent intake passages 94~94.100~100.106~
106 nodame surge tank 96.102.108 is,
It is arranged above the intermediate bank 16. The surge tanks 102108.96 are arranged adjacent to each other.

As described above, the surge tank 96 and the surge tank 102
, the surge tank 108 is arranged above the intermediate bank 16. Therefore, the degree of freedom in the layout of the intake system is increased, so the independent intake passages 94-94, 100-10
0.106~106 does not need to be forcibly bent and arranged, and the independent intake passage 94~94.100~100.106
By smoothing the curves of ~106, intake resistance can be reduced and engine output can be improved.

Also, independent intake passage 94-94.100-100.10
6 to 106 are set to have the same length, so each cylinder 20 to 20, 22 to 22 of each bank 14.16.18
．． The outputs of 24 to 24 become the same, thereby stabilizing the output of the engine 10.

As described above, the center line L1 of the intermediate bank 16 is not arranged vertically, but is inclined toward the rear of the vehicle relative to the vertical line L2, and therefore the engine 10 as a whole is positioned toward the rear of the vehicle. It is placed at an angle. therefore,
The surge tank 96, the surge tank 102, and the surge tank 108 are arranged above the intermediate bank 16 and at the rear of the vehicle body, and the surge tank 96.102. 108 requires a large amount of space. Here, as mentioned above, since the engine 10 is placed horizontally with respect to the vehicle body (so-called horizontally installed engine), the space above the engine 10 is small on the front side of the vehicle body, and the space on the rear side of the vehicle body is small. big. In addition, the hood 12 is set low at the front of the vehicle body,
Note that the rear of the vehicle is set high.

Therefore, the surge tank 96, 102, 108 is accommodated in a large space above the engine 10 on the rear side of the vehicle body, and therefore the engine 10 and its intake system are appropriately accommodated in the space under the hood 12. can do.

Next, FIG. 4 shows a front cross section of an engine intake system according to a second embodiment of the present invention, and in FIG. 4, the same members as those of the first embodiment shown in FIGS. are given the same reference numerals and the description thereof will be omitted.

In the first embodiment, the independent intake passages 94 to 94.1 of the front bank 14, intermediate bank 16, and rear bank 18 are
00~100.106~106 No.1 surge tank 9
6.102.108 is provided separately, but the fourth
In the second embodiment shown, three surge tanks 96.
102 and 108 are constituted by a common surge tank 112. The second embodiment also provides the same effects as the first embodiment, and furthermore,
The configuration can be simplified.

Next, FIG. 5 shows a front cross section of an engine intake system according to a third embodiment of the present invention, and FIG. 6 shows a plan view of the intake and exhaust system of the engine shown in FIG. In Fig. 5.6, the same members as those in the first embodiment shown in Fig. 1.2.3 are given the same reference numerals, and the explanation thereof will be omitted.

In the first embodiment, the intake systems of the four cylinders 22 to 22 of the intermediate bank 16 are arranged on the rear bank 18 side, and the exhaust systems are arranged on the front bank 14 side (see Fig. 3). In the third embodiment shown in FIG. 5.6, two cylinders 22-1, 22-4 of the intermediate bank 16
The intake system is arranged on the rear bank 18 side, and the exhaust system is arranged on the front bank 14 side, and the two cylinders 22-2 and 22-3 of the intermediate bank 16 have their intake systems arranged on the front bank 18 side. It is arranged on the bank 14 side, and its exhaust system is arranged on the rear bank 18 side.

That is, the intake boat 52- of cylinder 22-1.22-4
1.52-4 is independent intake passage 100-1.100-4
from the rear bank 18 side via the surge tank 102
In addition, the intake port 52-2.52-3 of the cylinder 22-2.22-3 is connected to the independent intake passage 100-2.1.
It is connected to the surge tank 102 from the front bank 14 side via 00-3. Also, cylinder 22-1.22
-4 exhaust boat 54-1, 54-4 has exhaust passage 86
- 1.86-4 to the exhaust manifold 88A located between the front bank 14 and the intermediate bank 16, and also the exhaust bow of the cylinder 22-2.22-3) 54
-2.54-3 is connected to an exhaust manifold 88B disposed between the intermediate bank 16 and the rear bank 18 via an exhaust passage 86-2.86-3.

The third embodiment also provides the same effects as the first embodiment.

Next, FIG. 7 shows a front cross section of an engine intake system according to a fourth embodiment of the present invention, and in FIG. 7, the same members as those in the third embodiment shown in FIGS. The same reference numerals are used to omit the explanation.

In the third embodiment, the independent intake passages 94 to 94.1 of the front bank 14, intermediate bank 16, and rear bank 18 are
surge tank 9 for 00-100, lo6-106
61.1o2.108 are arranged adjacently above the intermediate bank 16, but in the fourth embodiment of FIG.
Two surge tanks 96.102.108 are spaced above the intermediate bank 16. The fourth embodiment also provides the same effects as the third embodiment.

"Effects of the Invention" As explained above, according to the present invention, the surge tanks for the three banks are arranged above the intermediate bank, increasing the degree of freedom in the layout of the intake system and It is possible to smooth out the bends in the independent intake passage. Therefore, intake resistance can be reduced and engine output can be improved.

Further, according to the present invention, the surge tanks for the three banks are arranged above the intermediate bank, so that space is secured between the front bank and the intermediate bank and between the intermediate bank and the rear bank. can be done, which results in
The ease of assembling the intake system is improved.

Furthermore, according to the present invention, the surge tanks for the three banks are located above the middle bank, so that the intake system can be located away from the exhaust system, which allows the intake system to be separated from the exhaust system. Heat damage to the system can be prevented.

[Brief explanation of the drawing]

1 is a front sectional view of an engine intake device according to a first embodiment of the present invention, FIG. 2 is a schematic plan view of the device shown in FIG. 1, and FIG.
FIG. 4 is a front sectional view of an engine intake system according to a second embodiment of the present invention; FIG. 5 is a front sectional view of an engine intake system according to a third embodiment of the present invention. 6 is a plan view of the intake and exhaust system of the engine shown in FIG. 5, and FIG. 7 is a front sectional view of the intake system of the engine according to the fourth embodiment of the present invention. 10...-W-type 12-cylinder engine, 12...bonnet, 13-...crankshaft, 14 - front bank, 16 intermediate bank, 18 rear bank, 20.20.20.20 cylinder, 22.22.22. 22- cylinder, 24.24.24.24 cylinder, 26 cylinder block, 28 cylinder head, 46 cylinder block, 48 cylinder head, 66 cylinder block, 68 cylinder head, 94-94- independent intake passage 96 surge tank, 100-100 independent intake passage, 102 surge tank, 106-106 independent intake passage, 108 surge tank, 112 common surge tank. Figure 2

Claims (1)

[Scope of Claim] An intake system for an engine including three banks arranged at a predetermined angle to each other in the direction of the crankshaft, each bank having a plurality of cylinders, wherein each bank has a plurality of cylinders. An intake system for an engine, characterized in that the cylinders are connected to surge tanks through respective independent intake passages, and the surge tanks for the three banks are arranged above the intermediate bank.