JP3077223B2 - Engine intake pipe structure - 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 pipe structure of an engine, and more particularly, to a transmission in which an engine having a first cylinder bank and a second cylinder bank arranged in a V-shape is mounted. The present invention relates to an intake pipe structure of an engine for improving rigidity.

[0002]

2. Description of the Related Art In an engine which is an internal combustion engine of a vehicle, there are an engine in which cylinders are arranged in series, an engine in which cylinders are arranged to face each other, and an engine in which each bank cylinder is arranged in a V-shape. .

[0003] A V in which each bank cylinder is arranged in a V shape.
In the type engine, first and second cylinder heads are mounted on first and second cylinder banks of a V-shaped cylinder block, and a crank shaft is rotatably provided on the cylinder block so as to be directed in the front-rear direction of the engine. In some cases, the front end face of the first head of the first cylinder head projects forward of the engine from the front end face of the second head of the second cylinder head in the axial direction of the crankshaft.

Further, as an intake pipe structure of an engine, there is one disclosed in Japanese Patent Application Laid-Open No. 63-192953. The method of forming an intake manifold for a multi-cylinder engine disclosed in this publication is based on a state in which cores for forming internal passages of a plurality of intake branch pipes arranged in parallel with each other are integrally connected by upper and lower molds. Molding, reducing the number of molds,
The workability of core molding is improved, and the position of the core is accurate, which facilitates setting the core in the mold.

[0005]

In the conventional intake pipe structure of an engine, for example, in a case where an intake manifold is mounted on a V-type engine, when a cylinder block of the V-type engine is coupled to a transmission, The coupling surface of the transmission is coupled to the coupling surface of the cylinder block by bolts, and the intake manifold is located between the first and second cylinder banks.

However, when the transmission is connected to the cylinder block, the rigidity of the portion between the first and second cylinder banks is weakened due to the structure, and the rigidity is reduced particularly when the angle between the banks is approximately 90 degrees. Is what you do.

As a result, the vibration and noise of the V-type engine increase due to the decrease in the coupling rigidity, and when the V-type engine is mounted on the vehicle, the riding comfort at the time of driving deteriorates.
There is a disadvantage that it is practically disadvantageous.

[0008]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention is directed to an engine in which a first cylinder bank and a second cylinder bank are arranged in a V-shape to reduce the driving force from the engine. A transmission that shifts as required is mounted on one side of the engine to form a V-shaped space surrounded by a cylinder block and two cylinder heads respectively constituting the first and second cylinder banks. An intake manifold comprising a surge tank and a branch pipe is provided, and a base end of the branch pipe is connected to each side surface of the cylinder head facing the V-shaped space, and the surge tank is connected to the branch pipe. Below and near the one side of the engine, and is fixed to at least the top of the connection surface of the transmission with the engine to improve the coupling rigidity. Characterized by being configured to.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
The surge tank section of the intake manifold is arranged below the branch pipe and closer to one side of the engine, and is fixed to at least the top of the connection surface of the transmission with the engine, thereby improving the coupling rigidity of the engine to reduce vibration and noise. Has been reduced.

[0010]

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

FIGS. 1 and 2 show an embodiment of the present invention. 1 and 2, reference numeral 2 denotes a V-type engine, 4
Is a V-shaped cylinder block, 6-1 and 6-2 are first and second cylinder banks, and 8-1 and 8-2 are first and second cylinder banks.
It is a cylinder head. That is, the V-type engine 2 includes first and second cylinder heads 8-1, 8 in the first and second cylinder banks 6-1 and 6-2 of the V-shaped cylinder block 4.
-2 is placed.

Also, the first and second cylinder heads 8-1, 8-1
8-2, first and second camshafts (not shown) are rotatably provided.

The cylinder block 4 of the V-type engine 2
Transmission 10 on one side (right side in FIG. 1).
Is mounted, and the driving force from the V-type engine 2 is shifted as required by the transmission 10 to transmit the driving force to wheels (not shown).

Further, two first and second cylinder heads 8-1, 8 constituting the cylinder block 4 of the V-type engine 2 and the first and second cylinder banks 6-1, 6-2, respectively.
-2, and a downstream end portion of the intake manifold 12 that distributes and supplies intake air from a carburetor (not shown) to each combustion chamber (not shown) in the V-shaped space S. Is arranged. At this time, the intake manifold 12 includes a surge tank portion 12a and a branch pipe 12b.
The engine is disposed in a bank between the first and second cylinder heads 8-1 and 8-2 on the cylinder block 4 of the model engine 2.

The side surfaces (not shown) of the first and second cylinder heads 8-1 and 8-2 with the base end (not shown) of the branch pipe 12b of the intake manifold 12 facing the V-shaped space S. The surge tank 12a is disposed below the branch pipe 12b and closer to one side (the right side in FIG. 1) of the V-type engine 2 and at least the V-type engine of the transmission 10. 2
And is connected to the top T of the connection surface F to improve the coupling rigidity.

More specifically, the intake manifold 12 includes:
As shown in FIG. 1, for example, a connection arm 14 extending downward is provided integrally, and an end 14a serving as a lower end of the connection arm 14 is provided.
Is fixed to a transmission case 16 of the transmission 10 with bolts 18. That is, as shown in FIG. 1, the end 14a of the connecting arm 14 is connected to the V-type engine 2 of the transmission case 16 of the transmission 10.
And the transmission 10
Surface F of the transmission case 16 with the V-type engine 2
The bolt 18 is fixed to the top T of the bolt.

Reference numeral 20 denotes an oil pan mounted below the cylinder block 4 of the V-type engine 2.

Next, the operation will be described.

The downstream end of the intake manifold 12 is V
Mounted on the cylinder block 4 of the engine 2 and the surge tank portion 12a of the intake manifold 12 is disposed below the branch pipe 12b and closer to one side (the right side in FIG. 1) of the V-type engine 2 and at least The transmission case 10 of the transmission 10 is fixed to a top portion T of a connection surface F of the transmission case 16 with the V-type engine 2.

That is, the end 14a of the connecting arm 14 formed in the intake manifold 12 is brought into contact with the top T of the connecting surface F of the transmission case 16 of the transmission 10 with the V-type engine 2, and the connecting arm 14 and the transmission The case 16 is fixed to the case 16 by bolts 18.

As a result, the connecting arm portion 14 can be integrally formed in the middle of the intake manifold 12, and the V-type engine 2 and the transmission case 16 of the transmission 10 can be connected without increasing the number of parts. And the cost can be reduced, which is economically advantageous, and the coupling portion is located on one side of the V-type engine, so that the mounting property can be improved. It is practically advantageous.

Further, by improving the coupling rigidity between the V-type engine and the transmission, vibration and noise generated from the V-type engine can be reduced. The ride comfort can be improved, which is practically advantageous.

It should be noted that the present invention is not limited to the above-described embodiment, and various applications and modifications are possible.

For example, in the embodiment of the present invention, the connecting arm portion 14 of the intake manifold 12 and the transmission case 16 of the transmission 10 are connected, but the surge tank portion 12a of the intake manifold 12 is connected.
To one side of the V-type engine 2 and the transmission 1
The V-type engine 2 and the transmission 10 are fixed to the transmission 10 so as to straddle a connection surface F with the transmission engine 10.
In other words, not only the connection of the transmission 10 to the transmission case 16 but also the connection arm 14 of the intake manifold 12 is fixed to the cylinder block 4 by bolts 30 as shown by a dashed line in FIG. Can be further improved.

[0025]

As described above in detail, according to the present invention, in a V-shaped engine in which the first cylinder bank and the second cylinder bank are arranged, a transmission for shifting the driving force from the engine to a required speed is provided. It is mounted on one side of the engine and forms a V-shaped space surrounded by a cylinder block and two cylinder heads respectively constituting the first and second cylinder banks. In this V-shaped space, a surge tank portion, a branch pipe, An intake manifold consisting of a cylinder is connected, the base end of the branch pipe is connected to each side of the cylinder head facing the V-shaped space, and the surge tank is positioned below the branch pipe and closer to one side of the engine. And at the top of the connection surface with the engine of the transmission to improve the coupling stiffness. Jin can combine and a transmission, both can improve the binding rigidity of the V-type engine and transmission, to give a cheaper cost, which is economically advantageous. Also, by improving the coupling rigidity between the V-type engine and the transmission, vibration and noise generated from the V-type engine can be reduced, and the driving comfort when the V-type engine is mounted on the vehicle is improved. Can improve. Further, the surge tank portion of the intake manifold is disposed below the branch pipe and closer to one side of the engine, and is fixed to at least a top portion of a connection surface of the transmission with the engine to improve coupling rigidity. Accordingly, the coupling portion is located on one side of the engine, and the mounting property can be improved, which is practically advantageous.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a V-type engine according to an embodiment of the present invention, in a state where an intake pipe is attached.

FIG. 2 is a schematic view of a V-type engine as viewed from a transmission mounting side.

[Explanation of symbols]

 2 V-type engine 4 Cylinder block 6-1 First cylinder bank 6-2 Second cylinder bank 8-1 First cylinder head 8-2 Second cylinder head 10 Transmission 12 Intake manifold 14 Connecting arm 16 Transmission case 18 Volt

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02M 35/10 F02B 61/06 F02B 75/22

Claims (2)

(57) [Claims] 1. An engine in which a first cylinder bank and a second cylinder bank are arranged in a V-shape .
A transmission that shifts the driving force to the required
It mounted on one side of the Jin, to form a V-shaped space surrounded by the cylinder block and the first, two cylinder heads you respectively constituting the second cylinder bank, a difference in the V-shaped space
An intake manifold comprising a Jitanku portion and the branch pipe disposed <br/>, facing the base end portion of the branch pipe to the V-shaped space wherein the sheet
Connected to each side of the Linda head, the surge tank
Part below the branch pipe and closer to one side of the engine
Intake pipe structure of an engine as well as arranged, characterized by being configured to enhance the bond rigidity secured to the top of the connection surface between the engine of at least the transmission to. 2. The engine according to claim 1, wherein the surge tank is provided with
Before straddling the connection surface between one side and the transmission
The engine is fixed to the engine and the transmission.
The intake pipe structure for an engine according to claim 1, wherein