JPH06167260A - Intake device for engine - Google Patents

Abstract

PURPOSE:To reduce the dimension of an engine, simplify installation work, maintain the sealing performance, and improve the cooling performance by forming an inaka manifold integrally with a head cover, arranging each installation surface of the head cover and the intake manifold for a cylinder head on the equal level. CONSTITUTION:As for an engine 2, a plurality of cylinder heads 6 (A, B) head covers 8 (A, B), intake manifolds 20 (A, B), and surge tanks 50 (A, B) are installed in succession in the upper part of a V-shaped cylinder block 4, and a plurality of cylinder banks 10 (A, B) are arranged in a V-form. In this case, the intake manifold 20 is formed integrally with the head cover 8. The installation surfaces S1 and S2 of the head cover 8 and the intake manifold 20 for the cylinder head 6 are arranged on the same level S. Accordingly, the width and height of the engine 2 can be reduced, and the necessity of fixing the upper part of the head cover 8 is obviated, an the precision at the installation surface part is secured.

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 forming an intake manifold integrally with a cylinder head cover and providing a cylinder head cover mounting surface to the cylinder head and an intake manifold mounting surface to the cylinder head. The present invention relates to an air intake device for an engine that has the same plane.

[0002]

2. Description of the Related Art As an engine mounted on a vehicle, 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 a first engine , An engine in which the second cylinder bank is arranged in a V shape, and the like.

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

An air intake device for the engine is disclosed in Japanese Utility Model Laid-Open No. 57-75158. The surge tank mounting structure disclosed in this publication is a structure in which a surge tank of an engine with an electronically controlled fuel injection device is mounted on a cylinder head cover, so 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 arranged in a substantially V-shaped cylinder block 104. The first and 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.

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 side will be described. Second
Although description of the cylinder head 106B side is omitted, it will be described in the drawing.

Outside the first cylinder head 106A (see FIG. 4).
And 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, and the inside of the first cylinder head 106A (FIG. 4). Further, the first exhaust port 122A is formed on the left side in FIG. 5, and the upstream end of the first exhaust manifold 124A is connected to the first exhaust port 212A.

The first intake port 118 is provided to supply an appropriate amount of fuel to a combustion chamber (not shown) of the engine 102.
A first injector 126A for injecting fuel into A is attached to an outer portion of the first cylinder head 106A,
A first delivery pipe 128A that communicates 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 replaced by the first cylinder head 106A.
It will be located at the top.

However, as is 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 installation space of the engine room becomes large, which is disadvantageous in practical use. There is inconvenience.

Further, as shown in FIGS. 4 and 5, the first
First intake manifold 120A on the cylinder head 106A
, The first surge tank 130A is located above the first cylinder head cover 108A, that is, the first surge tank 130A is largely overloaded from the mounting surface S2 of the first intake manifold 120A. Oscillates significantly, the sealing property of the mounting surface S2 is impaired, and the reliability of the seal decreases.

Further, in order to prevent the swing of the first surge tank 130A described above, 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 a fixing bolt 144A. Although it can be fixed, the first intake manifold 120
It is difficult to secure the accuracy between the mounting surface S2 of A and the fixed portion by the boss, and the number of parts increases and the weight increases, which is disadvantageous in practical use.

[0013]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention mounts a cylinder head on the upper part of a cylinder block and mounts a cylinder head cover and an intake manifold on the cylinder head, respectively. In an intake device for an engine in which a surge tank for an intake manifold is located above a head cover, the intake manifold is integrally formed with a cylinder head cover, and a cylinder head cover mounting surface for the cylinder head and an intake manifold mounting surface for the cylinder head are provided. Is located on the same plane.

[0014]

According to the invention as described above, when the cylinder head cover and the intake manifold are mounted on the cylinder head at the time of assembling the engine, the cylinder head cover and the intake manifold are integrally formed and have the same plane. Since the mounting surfaces are located on the upper side, the mounting work is facilitated.

[0015]

Embodiments of the present invention will be described in detail below with reference to the drawings.

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

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

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

The first cylinder head 6A of the engine 2
In the second cylinder head 6B and the second cylinder head 6B, since the intake system and the exhaust system are formed substantially symmetrically, 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 on the outside of the first cylinder head 6A (right side in FIGS. 1 and 2), and the downstream end of the first intake manifold 20A is connected to the first intake port 18A. The first exhaust port 22A is formed inside the first cylinder head 6A (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. Set up.

Further, a first injector 26A for injecting fuel into the first intake port 18A so as to supply an appropriate amount of fuel to a combustion chamber (not shown) of the engine 2 is attached to an outer portion of the first cylinder head 6A. Then, the 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 integrally formed with the first cylinder head cover 8A, and the mounting surface S1 of the first cylinder head cover 8A to the first cylinder head 6A and the first cylinder head 6 are attached.
The mounting surface S2 of the first intake manifold 20A to A is located on the same plane S.

More specifically, as shown in FIG. 1, the first intake manifold 20A is formed integrally with the first cylinder head cover 8A, and the first surge tank 30A of the first intake manifold 20A has the first cylinder head 6A. While located at the top, the first surge tank 30A is partitioned by the upper wall portion 32 of the first cylinder head cover 8A.

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

Next, the operation will be described.

When the first cylinder head 6A is mounted with the first cylinder head cover 8A and the first intake manifold 20A 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. Attached to the first intake manifold 20A
Is attached to the first cylinder head 6A by the attachment 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, respectively. This makes installation work easier.

As a result, each of the width W and the height H of the engine 2 can be made smaller than the conventional one, and the size can be reduced, and the engine room can be arranged when the engine is mounted on the vehicle. Space can be reduced, which is practically advantageous.

Further, the first cylinder head cover 8A
And the first surge tank 30A of the first intake manifold 20A
Since the and are integrally formed, the conventional fixing work on the upper portion of the first cylinder head cover 8A is 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 located on the same plane S, the accuracy of the mounting surface portion can be easily ensured, and the sealing property of the mounting surface portion can be maintained well, which is practically advantageous. is there.

Furthermore, when the hydraulic pressure in the first cylinder head 6A rises, cooling is conventionally performed by radiating heat from the side wall of the cylinder head and the outer wall of the cylinder head cover. However, the cylinder head cover 8A and the first intake manifold 2 are cooled.
By integrally molding the 0A first surge tank 30A, the heat radiation area can be expanded and the cooling effect can be improved.

[0032]

As described above in detail, according to the present invention, the intake manifold of the engine is formed integrally with the cylinder head cover, and the cylinder head cover mounting surface to the cylinder head and the intake manifold mounting surface to the cylinder head are formed. Since it is configured to be located on the same plane, the width and height of the engine can be made smaller than those of the conventional one, and the size of the engine can be reduced. The installation space can be reduced. Further, since the cylinder head cover and the intake manifold are integrally formed, it is not necessary to fix the cylinder head cover on the upper portion of the conventional cylinder head cover, the number of parts can be reduced, and the weight can be reduced.
The cost can be reduced, which is economically advantageous. Further, by locating the mounting surface of the cylinder head cover to the cylinder head and the mounting surface of the intake manifold to the cylinder head on the same plane, it becomes easier to ensure the accuracy of the mounting surface area and the sealing performance of the mounting surface area. Can be maintained satisfactorily, which is practically advantageous. Furthermore, when the hydraulic pressure in the cylinder head rises, cooling is conventionally performed by radiating heat from the side wall of the cylinder head and the outer wall of the cylinder head cover, but since the cylinder head cover and the intake manifold are integrally molded, the heat radiating area is reduced. Can be expanded and the cooling effect can be improved.

[Brief description of 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.

3 is a cross-sectional view taken along the line 〓-〓 of FIG.

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

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

[Explanation of symbols]

 2 engine 4 cylinder block 6A, 6B 1st, 2nd cylinder head 8A, 8B 1st, 2nd cylinder head cover 10A, 10B 1st, 2nd cylinder bank 12 oil pan 14 bearing cap 18A 1st intake port 20A 1st intake air Manifold 22A 1st exhaust port 24A 1st exhaust manifold 26A 1st injector 28A 1st delivery pipe 30A 1st surge tank 32 Upper wall part 34A, 34B 1st, 2nd intake valve 36A, 36B 1st, 2nd exhaust valve

[Procedure amendment]

[Submission date] February 10, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

Claims (1)

[Claims] 1. An intake system for an engine, wherein a cylinder head is mounted on an upper part of a cylinder block, a cylinder head cover and an intake manifold are respectively mounted on the cylinder head, and a surge tank of the intake manifold is located on the upper part of the cylinder head cover. The intake manifold of the engine is characterized in that the intake manifold is formed integrally with the cylinder head cover, and 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. apparatus.