JPH0430337Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an intake system for a V-type engine, and particularly for a V-type engine equipped with a surge tank and two intake pipes extending upstream from the surge tank. Related to intake device structure.

(Prior Art) It has been known for a long time to obtain a supercharging effect by utilizing the resonance effect of the intake air itself, without using a special pressurizing device such as a turbo charger or a super charger. . For example, special public relations
In No. 2892, the intake system of a multi-cylinder engine is
A structure is disclosed in which each group is provided with a surge tank as a resonance tank, and an independent intake pipe communicating with each cylinder is connected to this surge tank. Resonant tubes each having a predetermined length extend from the upstream side of the surge tank, and these resonant tubes are connected to a common header further upstream. The upstream side of the header consists of a single intake passage equipped with a turbocharger. This disclosed structure utilizes resonance in a vibration system composed of a resonant tube and a resonant tank, and is most efficient in the engine rotation speed region near the natural frequency of the vibration system. A constant supercharging effect can be obtained over a wide rotation speed range.

(Problems to be solved) As mentioned above, the structure in which the intake system is grouped and includes two surge tanks and a resonant intake pipe connected to each of them makes it possible to obtain a dynamic supercharging effect with high efficiency. However, in order to obtain this effect, the resonant intake pipe needs to be quite long.
This increases the size of the device and creates space problems. Therefore, it is difficult to mount the intake structure described in Japanese Patent Publication No. 57-2892 as is in a vehicle having an extremely limited space, such as a normal passenger car.

(Means for solving the above problem) The present invention is configured as follows in order to solve the above problem. That is, the intake system for a V-type engine according to the present invention includes a V-type engine having an engine output shaft extending in the longitudinal direction of a vehicle, an intercooler disposed at the front of the engine room, and an intercooler disposed in the upper part of the V-type engine. two surge tanks provided next to each other corresponding to the left and right banks of the V-type engine, an intake pipe extending from the surge tank to each cylinder constituting the bank, and a resonance extending from the intercooler to the surge tank. each surge tank has its longitudinal direction in the same direction as the cylinder row direction of each bank, and the longitudinal center of each surge tank is located further forward of the vehicle than the center of each bank in the cylinder row direction. The resonance tubes are arranged offset to the side, and each of the resonance tubes is provided with two adjacent to each other,
It is characterized in that it extends from the rear end of the surge tank toward the rear of the vehicle, is curved in a U-shape, and extends linearly toward the intercooler, merging in front of the intercooler. According to the present invention, in order to obtain a strong resonance effect of intake air, two surge tanks are connected to each bank of the V-type engine on the left and right, and the upstream side of the surge tank is connected to the respective surge tank. The two intake pipes are connected. This intake pipe serves as a resonance pipe and requires a considerable length. In the present invention, these two intake pipes are arranged along the longitudinal direction of the side of the engine so as to extend at least as much as the length of the engine to ensure the length. The present invention can be applied in a particularly preferable manner to an engine in which the engine is installed vertically and an intercooler for a turbocharger is disposed in the front part of the engine room.

(Embodiment) Referring to FIGS. 1 and 2, a V-type engine E to which the present invention is applied is shown. V in this example
The type engine is a six-cylinder engine that is vertically arranged approximately in the center of the engine room 8, and the cylinders 11 that house pistons that are tilted and reciprocate in mutually intersecting directions form a cylinder row of three cylinders each. Each cylinder row has two left and right banks, namely a first bank 10a and a second bank 10a.
Configure b. In the intake device of this example, the first bank 1
A surge tank 12 extending in the longitudinal direction of the engine is provided approximately at the upper center of the second bank 10a and the second bank 10b. The surge tank 12 is divided by a partition wall 14 provided in the center, thereby dividing the surge tank 12 into a first surge tank 12a and a second surge tank 1.
2b is formed. Therefore, the first surge tank 1
The first bank 10a is located below the surge tank 2a, and the second bank 10b is located below the second surge tank 12b. These surge tanks 12
The upstream ends of independent intake pipes 16 communicating with each cylinder are connected to the sides of a and 12b. The downstream end of each independent intake pipe 16 is connected to the cylinder head 1 of each cylinder 11.
It is connected to the intake passage formed in 3. In this case, each independent intake pipe 16 is bent into a U-shape below the surge tank 12 and connected to the cylinder 11 of the opposite bank. That is, the independent intake pipe 16 connected to the first surge tank 12a is connected to the cylinder 11 in the second bank 10b, and the independent intake pipe 16 is connected to the second surge tank 12.
The independent intake pipe 16 connected to the first bank 10
It is connected to the cylinder 11 located at a. Therefore, the three independent intake pipes 16 toward the first bank 10a and the second
The three independent intake pipes 16 heading toward the bank 10b are arranged so as to intersect below the surge tank 12. The first surge tank 12a and the second
The downstream ends of separate intake pipes 18a and 18b are connected to the upstream side surface of the surge tank 12b, respectively. In this case, since the upstream end of the surge tank 12 is located at the rear of the engine room 8, the separated intake pipes 18a, 18b are connected to the rear end surface of the surge tank 12. Separated intake pipe 18
a and 18b extend backward from the connection part of the surge tank 12, and then are curved and directed laterally. At this time, the separate intake pipe 18
a and 18b are twisted from being lined up horizontally to being lined up vertically, and are connected at their upstream ends to openings arranged in parallel in the vertical direction of the throttle body 20. The intake passage upstream of the throttle body 20 is connected from a twin throttle connector 22 to two air pipes 24a and 24b arranged vertically in parallel. This air pipe 24 is connected to the engine E.
extends forward through the side of the engine room 8, joins at the front end of the engine room 8, and curves downward,
It is connected to the upper surface of the intercooler 26 located at the corner of the front end. The above-mentioned separated intake pipes 18a, 18
b and the air pipes 24a and 24b constitute a resonance tube 38, and a pressure wave propagates inside this resonance tube 38. On the other hand, the exhaust system includes a manifold 28a that collects the exhaust pipes of the cylinders of the first bank 10a, and a manifold 28b that collects the exhaust pipes of the cylinders of the second bank 10b.
The manifold 28a extends rearward and joins the manifold 28b to form a single exhaust pipe, which extends to the side of the engine crankcase. Turbo charger 30 arranged
connected to. On the downstream side of the turbocharger 30, exhaust gas passes through one exhaust pipe 32. Note that the intake pipe 31 on the upstream side of the intercooler 26 once rises from the top surface of the intercooler 26, extends toward the center of the engine room 8, and then passes through the side of the engine that curves toward the rear to connect the turbocharger. It is connected to the compressor of the tire 30. In addition, there is an engine cooling fan 34 in front of the engine, and a radiator 36 in front of it.
is installed.

In the engine E having the structure of this example, intake air is compressed by the compressor of the turbocharger. The intake air whose temperature has increased due to adiabatic expansion due to compression is transferred to the intercooler 2 through the intake pipe 31.
6 and is cooled in the cooler 26. The cooled intake air is led to two air pipes 24a, 24b, via the throttle body 20, to the separate intake pipes 18a, 18b, and then to the surge tank 12.
a, 12b. The intake air guided into the first surge tank 12a passes through the independent intake pipe 16 to the cylinders of the second bank 10b, and the intake air guided into the second surge tank 12b passes through the independent intake pipe 16.
6 to the cylinders of the first bank 10a. That is, in the present invention, the intake system is divided into two systems immediately after the intercooler 26, and intake air is supplied independently to the corresponding cylinder groups.

[Effect of idea]

As described above, the present invention has the advantage of arranging the surge tank offset to the front side of the vehicle, and extending the resonance pipe from the rear end of the surge tank to the rear of the vehicle.
It is then curved into a U-shape and extended linearly toward the intercooler located at the front of the engine compartment.

The first feature makes it possible to increase the length of the resonance tube by the amount of offset compared to a non-offset arrangement. The engine compartment is usually long in the vehicle width direction and short in the vehicle longitudinal direction, so
Due to this first feature, it is possible to make the entire engine more compact and to increase the number of parts that reduce intake resistance.

In addition, in engines equipped with an intercooler, the intercooler is often placed at the front of the engine room for cooling itself, but when the surge tank is placed above the engine in a vertical V-type engine, resonance The pipes can also extend from both sides of the surge tank in the width direction. However, with such a configuration, the resonance tube has many curved parts and a large space must be secured in the vehicle width direction. In this regard, by arranging the resonance tube as described in the second feature of the present invention, not only can the curved portion of the resonance tube be reduced, but also the length of the resonance tube as a whole can be reduced, and the intake resistance can be reduced. This makes it possible to achieve a significant reduction in Furthermore, the space required in the vehicle width direction can also be reduced. In particular, by arranging the surge tank offset to the front of the vehicle, it has become possible to increase the length between the rear end of the surge tank and the vehicle body in the longitudinal direction of the vehicle. It is possible to prevent the bending angle of the part from becoming a sharp bending angle, and the pressure wave propagation can be made smooth.

[Brief explanation of drawings]

FIG. 1 is a plan view of the main part of the engine room of a vehicle equipped with an engine intake system according to an embodiment of the present invention, and FIG. 2 is an elevational view of the main part of the engine room seen from the rear. . 10a, 10b...Bank, 12a, 12b...
...Surge tank, 16...Independent intake pipe, 18a,
18b...Separated intake pipe, 20...Throttle body, 26...Intercooler, 30...Turbo charger.

Claims (1)

[Claims for Utility Model Registration] A V-type engine E having an engine output shaft extending in the longitudinal direction of the vehicle; an intercooler 26 disposed in front of the engine room 8; Two surge tanks 1 are provided adjacently corresponding to the left and right banks 10a and 10b, respectively.
2a, 12b; an intake pipe 16 extending from the surge tanks 12a, 12b to each cylinder forming the banks 10a, 10b; and a resonance pipe 38 extending from the intercooler 26 to the surge tanks 12a, 12b.
In the intake system for a type engine, each of the surge tanks 12a, 12b has its longitudinal direction in the same direction as the cylinder row direction of each bank 10a, 10b, and the surge tanks 12a,
The longitudinal center of each bank 12b is located at the center of each bank 10.
The resonance pipes 38 are arranged offset to the front side of the vehicle from the center in the direction of the cylinder rows of the surge tanks 12a and 10b, and two of the resonance pipes 38 are provided next to each other.
It is characterized by extending from the rear end side toward the rear side of the vehicle, curved in a U-shape, and extending linearly toward the intercooler 26, and merging in front of the intercooler 26. V-type engine intake system.