JP3182948B2 - 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 an engine, and more particularly to an intake system in which an intake manifold is integrally formed with a cylinder head cover, and a surface for mounting a cylinder head cover on a cylinder head and a surface for mounting an intake manifold on a cylinder head. The present invention relates to an engine intake device having the same plane.

[0002]

2. Description of the Related Art An engine mounted on a vehicle includes an engine in which cylinder banks are arranged in series, an engine in which first and second cylinder banks on one side and the other side are arranged to face each other, and And an engine in which the second cylinder banks are arranged in a V-shape.

In an engine in which the cylinder banks on each side are arranged in a V-shape, first and second cylinder heads are mounted on a substantially V-shaped cylinder block, respectively, and the first and second cylinder heads are respectively mounted on the first and second cylinder heads. The first and second cylinder banks are arranged in a V-shape with the second cylinder head cover mounted thereon.

[0004] As an intake device for the engine, there is one disclosed in Japanese Utility Model Laid-Open No. 57-75158. The surge tank mounting structure disclosed in this publication is characterized in that, in a structure in which a surge tank of an engine with an electronically controlled fuel injection device is mounted on a cylinder head cover, the surge tank is configured such that one wall surface of the surge tank forms one wall surface of the cylinder head cover. And the cylinder head are integrated.

[0005]

By the way, in the intake system of a conventional engine, for example, a V-type engine, as shown in FIGS. 4 and 5, the engine 102 is provided with a substantially V-shaped cylinder block 104 respectively. First, the second cylinder heads 106A and 106B are placed, the first cylinder head cover 108A is placed on the first cylinder head 106A, and the second cylinder head cover 108B is placed on the second cylinder head 106B. The second cylinder banks 110A and 110B are arranged in a V-shape.

Here, since the intake system and the exhaust system are formed substantially symmetrically in the first cylinder head 106A and the second cylinder head 106B of the engine 102, only the first cylinder head 106A will be described. Second
Although the description on the cylinder head 106B side is omitted, it is described in the drawings.

The outside of the first cylinder head 106A (FIG. 4)
A first intake port 118A is formed on the right side in FIG. 5 and the downstream end of the first intake manifold 120A communicates with the first intake port 118A, so that the inside of the first cylinder head 106A (FIG. 4). 5 (left side in FIG. 5), a first exhaust port 122A is formed, and the upstream end of the first exhaust manifold 124A communicates with the first exhaust port 122A.

The first intake port 118 supplies a proper amount of fuel to a combustion chamber (not shown) of the engine 102.
A first injector 126A for injecting fuel into A is mounted on an outer portion of the first cylinder head 106A,
A first delivery pipe 128A communicating with the first injector 126A is fixed to the first intake manifold 120A.

The first surge tank 130A of the first intake manifold 120A is connected to the first cylinder head 106A.
It will be located at the top.

However, as apparent from FIG. 4, the width Wp and the height Hp of the engine 102 are large, and when the engine is mounted on a vehicle, the space for disposing the engine room becomes large, which is disadvantageous in practical use. There are inconveniences.

Also, as shown in FIGS. 4 and 5, the first
The first intake manifold 120A is attached to the cylinder head 106A.
When the first surge tank 130A is mounted, the first surge tank 130A is located above the first cylinder head cover 108A, that is, largely overlaps with the mounting surface S2 of the first intake manifold 120A. Greatly swings, and the sealing performance of the mounting surface S2 is impaired, and the reliability of the seal is reduced.

Further, in order to prevent the above-mentioned swinging of the first surge tank 130A, as shown in FIG. 5, the boss 142A of the first surge tank 130A is fixed to the boss 140A above the first cylinder head cover 108A with fixing bolts 144A. Although it is possible to fix it, the first intake manifold 120
It is difficult to secure the accuracy between the mounting surface S2 of A and the fixing portion by the boss, and the number of parts increases, the weight increases, and this is disadvantageous in practical use.

[0013]

In order to eliminate the above-mentioned disadvantages, the present invention has a cylinder head mounted on an upper portion of a cylinder block, and a cylinder head cover and an intake manifold mounted on the cylinder head, respectively. In an intake device for an engine in which a surge tank of an intake manifold is located above a head cover, the intake manifold is formed integrally with a cylinder head cover, and the internal space of the cylinder head cover and the intake manifold are formed on the cylinder head cover side of the intake manifold. An inner wall for partitioning an internal space is provided, a fixing portion of a delivery pipe for supplying fuel to the engine is provided on an outer wall of the intake manifold opposite to the cylinder head cover with respect to the intake manifold, and a fuel is provided on an outer portion of the cylinder head. Injection valve Mounting, and is characterized in that a structure to position the said cylinder head cover mounting surface of the cylinder head and the intake manifold mounting surface of the cylinder head on the same plane.

[0014]

According to the invention described above, when the cylinder head cover and the intake manifold are mounted on the cylinder head during assembly of the engine, the cylinder head cover and the intake manifold are integrally formed, and the cylinder head cover of the intake manifold is formed. On the side, the internal space of the cylinder head cover and the internal space of the intake manifold are separated by an inner wall, and a delivery pipe that supplies fuel to the engine is attached to a fixed part provided on the outer wall of the intake manifold opposite to the cylinder head cover with respect to the intake manifold ,
The fuel injection valve is mounted on the outer portion of the cylinder head, and the mounting surface is located on the same plane to facilitate the mounting operation.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. In FIG. 2, 2 is an engine, 4 is a cylinder block, 6A and 6B are first and second cylinder heads, 8
A and 8B are first and second cylinder head covers, 10A,
10B denotes first and second cylinder banks, and 12 denotes an oil pan.

The engine 2 has first and second cylinder heads 6A and 6B respectively mounted on a substantially V-shaped cylinder block 4.
Is mounted, the first cylinder head cover 8A is mounted on the first cylinder head 6A, and the second cylinder head cover 8B is mounted on the second cylinder head 6B.
The second cylinder banks 10A and 10B are arranged in a V-shape.

In the engine 2, a bearing cap 14 is attached to a lower portion of the cylinder block 4 to support a crankshaft 16, and the oil pan 12 is attached to a lower portion of the bearing cap 14.

The first cylinder head 6A of the engine 2
Since the intake system and the exhaust system are formed substantially symmetrically between the first cylinder head 6B and the second cylinder head 6B, only the first cylinder head 6A side will be described, and the description of the second cylinder head 6B side will be omitted. Is described.

A first intake port 18A is formed outside the first cylinder head 6A (right side in FIGS. 1 and 2), and a downstream end of the first intake manifold 20A is connected to the first intake port 18A. A first exhaust port 22A is formed inside the first cylinder head 6A (the left side in FIGS. 1 and 2), and the upstream end of the first exhaust manifold 24A is connected to the first exhaust port 22A. Provided.

A first injector 26, which is a fuel injection valve for injecting fuel into the first intake port 18A to supply an appropriate amount of fuel to a combustion chamber (not shown) of the engine 2, is provided.
A is mounted on an outer portion of the first cylinder head 6A, and a first delivery pipe 28A communicating with the first injector 26A is fixed to the first intake manifold 20A.

At this time, the first intake manifold 20A
Is formed integrally with the first cylinder head cover 8A, and the internal space 8 of the first cylinder head cover 8A is formed on the first cylinder head cover 8A side of the first intake manifold 20A.
AM and the internal space 20A of the first intake manifold 20A
An upper wall portion 32A, which is an inner wall defining M, is provided, and an outer wall 20 of the first intake manifold 20A opposite to the first cylinder head cover 8A with respect to the first intake manifold 20A.
A-1 is provided with a fixing portion 33A of a first delivery pipe 28A for supplying fuel to the engine 2, and a first injector 26A serving as a fuel injection valve is mounted on an outer portion of a first cylinder head 6A. First to head 6A
Mounting surface S1 of cylinder head cover 8A and mounting surface S2 of first intake manifold 20A on first cylinder head 6A
Are located on the same plane S.

More specifically, as shown in FIG. 1, when the first intake manifold 20A is formed integrally with the first cylinder head cover 8A, the first surge tank 30A of the first intake manifold 20A is connected to the first cylinder. The first surge tank 30A is located above the head 6A, and is partitioned by an upper wall 32A which is an inner wall of the first cylinder head cover 8A. That is, as shown in FIG. 1, the upper wall portion 32A, which is an inner wall, is provided on the first cylinder head cover 8A side of the first intake manifold 20A, with the internal space 8AM of the first cylinder head cover 8A and the first intake manifold 2A.
The interior space 20AM of 0A is partitioned. The internal space 20AM of the first intake manifold 20A is the first intake manifold 2A.
This includes not only the internal space of the branch pipe portion of 0A but also the internal space of the first surge tank 30A. Further, an outer wall 20A-1 of the first intake manifold 20A opposite to the first cylinder head cover 8A with respect to the first intake manifold 20A communicates with the first injector 26A to supply fuel to the engine 2. A fixing portion 33A for fixing the first delivery pipe 28A is provided.

Reference numerals 34A and 34B denote first and second intake valves, and 36A and 36B denote first and second exhaust valves.

Next, the operation will be described.

When the first cylinder head cover 8A and the first intake manifold 20A are mounted on the first cylinder head 6A during the assembly of the engine 2, the first cylinder head cover 8A is attached to the first cylinder head 6A by the mounting surface S1. And the first intake manifold 20A
Is mounted on the first cylinder head 6A by the mounting surface S2.

At this time, the first cylinder head cover 8A and the first surge tank 30A of the first intake manifold 20A are integrally formed, and the mounting surfaces S1 and S2 are located on the same plane S. This facilitates the mounting operation.

As a result, each of the width W and the height H of the engine 2 can be made smaller than that of the conventional engine, and the engine 2 can be downsized. The space can be reduced, which is practically advantageous.

The first cylinder head cover 8A
And first surge tank 30A of first intake manifold 20A
Is formed integrally with the first cylinder head cover 8A as in the related art, so that the fixing work on the upper portion of the first cylinder head cover 8A becomes unnecessary, the number of parts can be reduced, the weight can be reduced, the cost can be reduced, and the cost can be reduced. It is advantageous.

Further, since the mounting surfaces S1 and S2 are respectively located on the same plane S, it is easy to secure the accuracy of the mounting surface portion, and it is possible to maintain good sealing performance of the mounting surface portion, which is practically advantageous. is there.

Furthermore, when the hydraulic pressure in the first cylinder head 6A rises, cooling has conventionally been performed by radiating heat from the side walls of the cylinder head and the outer wall of the cylinder head cover, but the cylinder head cover 8A and the first intake manifold 2
Since the first surge tank 30A of 0A is formed integrally with the first surge tank 30A, the heat radiation area is enlarged, and the cooling effect can be improved.

Further, the internal space 8AM of the first cylinder head cover 8A and the first intake manifold 2 are located on the first cylinder head cover 8A side of the first intake manifold 20A.
Upper wall 32, which is an inner wall that defines 0A internal space 20AM
By providing A, the inner wall of the first intake manifold 20A and the inner wall of the first cylinder head cover 8A can be made a common upper wall portion 32A, so that moldability can be improved, and material and weight can be reduced. The size of the head of the engine 2 can be reduced. After adding,
This is achieved by arranging the fuel supply system outside the engine 2 with respect to the first intake manifold 20A.

Further, the engine 2 is mounted on an outer wall 20A-1 of the first intake manifold 20A opposite to the first cylinder head cover 8A with respect to the first intake manifold 20A.
Of the first delivery pipe 28A for supplying fuel to the first delivery pipe 28A
3A, the first cylinder head cover 8
A, the fixing portion 33A of the first delivery pipe 28A can be easily formed, and the fixing portion 33A is formed outside the first intake manifold 20A protruding to the outside. The distance is shortened, and the first delivery pipe 28A can be prevented from being vibrated by a bracket that is directly fixed or has a simple configuration without requiring a strong bracket.

Further, a fuel supply system (the first delivery pipe 28A and the first injector 26 which is a fuel injection valve)
A) is disposed outside the engine 2 with respect to the first intake manifold 20A, so that the first intake manifold 20A and the first
There is no need to arrange a fuel supply system between the cylinder head cover 8A. Then, the first intake manifold 20
A and the first cylinder head cover 8A can be arranged close to each other, so that the size of the first cylinder head cover 8A can be reduced. Since the mounting surface S1 of the first cylinder head cover 8A to the first cylinder head 6A and the mounting surface S2 of the first intake manifold 20A to the first cylinder head 6A can be arranged close to each other, the first processing which has conventionally been done only separately is performed. The mounting surface S1 of the first cylinder head cover 8A on the cylinder head 6A and the mounting surface S2 of the first intake manifold 20A on the first cylinder head 6A are on the same plane.
Workability can be improved. The workability can be improved by making the respective mounting surfaces also the same plane on the second cylinder head cover 8B side. At this time, if each mounting surface is simply made the same, a relatively long intake passage is formed on the cylinder head side, so that the intake manifold length becomes shorter than that of the conventional one, and it becomes difficult to mount the fuel injection valve. However, if the first injector 26A, which is a fuel injection valve, is mounted outside the first cylinder head 6A as in the present invention, the first injector 26 will not be able to achieve fuel injection at the proper position.
A can be arranged at the optimum position, and the mounting surface can be easily made the same.

[0035]

As described above in detail, according to the present invention, the cylinder head is mounted on the cylinder block, the cylinder head cover and the intake manifold are mounted on the cylinder head, and the intake manifold is mounted on the cylinder head cover. In an intake device for an engine in which a surge tank is located, an intake manifold is formed integrally with a cylinder head cover, and an inner wall is provided on the cylinder head cover side of the intake manifold to define an internal space of the cylinder head cover and an internal space of the intake manifold. A delivery pipe fixing part for supplying fuel to the engine is provided on the outer wall of the intake manifold on the side opposite to the cylinder head cover with respect to the manifold, a fuel injection valve is mounted on an outer portion of the cylinder head, and a cylinder head cover mounting surface on the cylinder head is provided. Shi Since the intake manifold mounting surface to the cylinder head and the intake manifold mounting surface are located on the same plane, the width and height of the engine can be made smaller than those of the conventional engine, and the engine can be downsized. The installation space of the engine room when the is installed can be reduced. In addition, since the cylinder head cover and the intake manifold are integrally formed, the fixing work on the upper part of the cylinder head cover as in the related art is unnecessary, the number of parts can be reduced, the weight can be reduced, and the cost can be reduced. It is economically advantageous. Furthermore, since the mounting surfaces of the cylinder head cover mounting surface to the cylinder head and the intake manifold mounting surface to the cylinder head are located on the same plane, it is easy to ensure the accuracy of the mounting surface, and the sealing performance of the mounting surface Can be favorably maintained, which is practically advantageous. Furthermore, when the hydraulic pressure in the cylinder head rises, cooling was conventionally performed by radiating heat from the side wall of the cylinder head and the outer wall of the cylinder head cover. However, since the cylinder head cover and the intake manifold are integrally formed, the radiating area is reduced. Can be enlarged and the cooling effect can be improved. Further, by providing an inner wall for partitioning the internal space of the cylinder head cover and the internal space of the intake manifold on the cylinder head cover side of the intake manifold, the inner wall of the intake manifold and the inner wall of the cylinder head cover may be made a common inner wall. Thus, the formability can be improved, the material and the weight can be reduced, and the size of the engine head can be reduced. In addition, this is achieved by arranging the fuel supply system outside the engine with respect to the intake manifold. Furthermore,
By providing a fixed portion of a delivery pipe for supplying fuel to the engine on the outer wall of the intake manifold on the side opposite to the cylinder head cover with respect to the intake manifold,
The fixed part of the delivery pipe can be easily formed on the cylinder head cover, and the fixed part is formed outside the intake manifold that protrudes outside, shortening the distance from the delivery pipe and requiring a strong bracket The vibration of the delivery pipe can be prevented with a bracket that is directly fixed or has a simple configuration. Furthermore, since the fuel supply system (delivery pipe or fuel injection valve) is arranged outside the engine with respect to the intake manifold, there is no need to arrange the fuel supply system between the intake manifold and the cylinder head cover. Since the intake manifold and the cylinder head cover can be arranged close to each other, the size of the cylinder head cover can be reduced. Since the cylinder head cover mounting surface to the cylinder head and the intake manifold mounting surface to the cylinder head can be arranged close to each other, the cylinder head cover mounting surface to the cylinder head and the intake manifold mounting surface to the cylinder head, which had to be separately processed in the past, Are made the same plane, and the workability can be improved. The workability can be improved by making the mounting surfaces on the cylinder head cover side the same plane. At this time, if each mounting surface is simply made the same, a relatively long intake passage is formed on the cylinder head side, so that the intake manifold length becomes shorter than that of the conventional one, and it becomes difficult to mount the fuel injection valve. However, if the fuel injection valve is mounted on the outside of the cylinder head as in the present invention, the fuel injection valve can be arranged at the optimum position and can be easily mounted. The surfaces can be the same.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a first cylinder head side showing an embodiment of the present invention.

FIG. 2 is a schematic view of a V-type engine.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a schematic view of a V-type engine showing a conventional technique of the present invention.

FIG. 5 is an enlarged sectional view of a first cylinder head side.

[Explanation of symbols]

 2 Engine 4 Cylinder block 6A, 6B First, second cylinder head 8A, 8B First, second cylinder head cover 10A, 10B First, second cylinder bank 12 Oil pan 14 Bearing cap 18A First intake port 20A First intake Manifold 22A First exhaust port 24A First exhaust manifold 26A First injector 28A First delivery pipe 30A First surge tank 32A Upper wall 34A, 34B First, second intake valve 36A, 36B First, second exhaust valve

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02M 35/10 F02F 7/00

Claims (1)

(57) [Claims] In an intake system for an engine, a cylinder head is mounted on an upper portion of a cylinder block, a cylinder head cover and an intake manifold are mounted on the cylinder head, and a surge tank of the intake manifold is located on the upper portion of the cylinder head cover. The intake manifold is formed integrally with a cylinder head cover, and an inner wall that partitions an internal space of the cylinder head cover and an internal space of the intake manifold is provided on the cylinder head cover side of the intake manifold, and the cylinder head cover and the intake manifold are provided. A fixed portion of a delivery pipe for supplying fuel to the engine is provided on an outer wall of the intake manifold on the opposite side, and fuel is injected into an outer portion of the cylinder head.
An intake device for an engine , wherein an injection valve is mounted, and a surface for mounting a cylinder head cover on the cylinder head and a surface for mounting an intake manifold on the cylinder head are located on the same plane.