JPH0730910Y2 - Intake device for V-type internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an intake device for a V-type internal combustion engine that utilizes the effect of inertia supercharging.

[Conventional technology]

Conventionally, as an intake device of this type, for example, a utility model Sho 61-4090
The one described in Japanese Patent No. 8 is known (shown in FIG. 3).

As shown in the figure, in this intake system, the cylinders of both banks 101 are divided into groups of two cylinders, and a branch pipe 10 is provided for each group.
An intake manifold 102 composed of 2a and a resonance pipe 102b is arranged, and each resonance pipe 102b is connected to a surge tank 103.

[Problems to be solved by the device]

As is well known, the inertia supercharging effect is to synchronize intake air vibration with a predetermined engine speed range by configuring a Helmholtz type resonator, and improve intake charge efficiency (for example, "Diesel passenger car, P148, 149 ”Supervised by Ryoji Kihara, published by Grand Prix Publishing Co., Ltd., first edition on November 1, 1984). Therefore, in order to increase the maximum output of the engine by synchronizing with the high speed side, it is necessary to increase the intake pressure frequency.

However, in the conventional intake device, the resonance tube 102b is short, so that the intake inertia effect is small, and the intake pressure frequency becomes small as derived from the Helmholtz equation, and the intake vibration is tuned on the high speed side. Was difficult.

As a means for solving such inconvenience, JP-A-60-62655
An intake device for a V-type engine shown in Japanese Patent Publication has been proposed.

However, in the above device, since the branch pipes acting as resonance pipes are provided between the surge tanks on the left and right banks and the cylinders provided on the other banks, respectively, a large number of branch pipes are provided between the banks. As a result, the structure between the banks becomes complicated, the size cannot be reduced, and the maintainability of the injection pump arranged between the banks is poor.

The present invention has been made in view of the above, and its purpose is to reduce the number of resonance tubes arranged between both banks to simplify the structure between the banks and to make the device compact, and at the same time To improve the maintainability of the injection pump installed in
The object of the present invention is to provide an intake device for a V-type internal combustion engine that can even out the output of each cylinder.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a V-type internal combustion engine, in which a plurality of cylinders are arranged in each of the left and right banks, and intake manifolds each having a predetermined volume are arranged in proximity to the banks. In an intake device for a V-type internal combustion engine in which an intake port and an exhaust port are formed in each bank, an intake manifold is connected to the intake port, and an exhaust manifold is connected to the exhaust port, the cylinders at both ends of the left and right banks are bent. Resonance tubes are connected, and the bent resonance tubes are arranged inside or outside the intake manifold on the same bank side where the intake ports are formed, and are connected to the banks on the opposite side to cylinders other than both ends of the left and right banks. Resonant tubes are connected, and the bent resonant tubes and the resonant tubes have substantially the same length.

[Action]

According to the above configuration, since the bent resonance pipes connected to the cylinders at both ends are arranged inside or outside the intake manifold, there are few resonance pipes arranged between the left and right banks that secure a large intake pressure frequency. Therefore, the structure between both banks becomes simple. Therefore, the device can be made compact, and the maintainability of the injection pump arranged between both banks is improved.

Further, since the bent resonance pipes and the resonance pipes in each cylinder have the same length, the suction volume efficiencies between the cylinders become equal, and variations in the output in each cylinder are prevented and can be made uniform.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

An intake device for a V-type internal combustion engine according to an embodiment of the present invention is
A type 8 cylinder diesel engine will be described as an example with reference to FIG.

In the figure, 1 is a crankcase, and a bank 2 in which four cylinders H1, H2, H3, and H4 are arranged in series on both left and right sides of the crankcase.
a and 2b are provided. An intake port 3 and an exhaust port 4 are formed in the left and right banks 2a, 2b.

Further, in the left and right banks 2a, 2b, intake manifolds 7 each having a predetermined volume and forming surge tanks are closely arranged in parallel along the banks 2a, 2b. The intake port 3 is connected to a predetermined intake manifold 7, and the exhaust port 4 is connected to the exhaust manifold 5.

Reference numeral 6 is an intake passage, which branches into branch pipes 6a and 6b from the middle of the intake passage.
It is connected to the intake manifold 7.

Cylinders H1 and H2 at both ends of the banks 2a and 2b are connected to relatively long bent resonance pipes 11 and 12 which can secure a large intake pressure frequency via an intake port 3. The bent resonance pipes 11 and 12 are inserted and arranged in the intake manifolds 7 on the same banks 2a and 2b side where the intake ports 3 are formed, and the tip portions 11a and 12a thereof are arranged on the opposite side of the intake manifold 7. It is open.

Further, the cylinders H3 and H4 other than the both ends of the banks 2a and 2b are
The banks 2b and 2a on the opposite sides are connected to the intake manifold 7 via the comparatively long resonance pipe 8 which can secure a large intake pressure frequency. The bent resonance tubes 11 and 12 and the resonance tube 8 have substantially the same length.

According to this embodiment, the bent resonance pipes 11 and 12 connected to the cylinders H1 and H2 are inserted and arranged in the intake manifolds 7 on the same banks 2a and 2b side where the intake ports are formed. The number of resonance tubes 8 arranged between the banks 2a and 2b is reduced, the structure between the banks 2a and 2b is simplified, and the device can be made compact.

Further, the injection pump 20 arranged between both banks 2a, 2b,
Due to the small number of resonance tubes 8 arranged between the banks 2a and 2b, the injection pump 20 can be directly touched by the hand. Therefore, the maintainability of the injection pump 20 is improved.

However, since the bent resonance pipes 11 and 12 and the resonance pipe 8 in each cylinder H1, H2, H3, and H4 have the same length, the suction volume efficiencies between the cylinders H1, H2, H3, and H4 are equal to each other. Cylinder H1, H2, H3, H4
It is possible to prevent variations in the output in and to make the output uniform.

In the above embodiment, the bent resonance pipes 11 and 12 are inserted and arranged in the intake manifold 7 on the same bank 2a, 2b side where the intake ports 3 are formed, as shown in FIG. The intake manifold 7 outside the intake manifold 7
The bent resonance tubes 11 and 12 may be integrally formed by casting along the same direction.

Further, although the above-mentioned embodiment exemplifies the V-type 8-cylinder diesel engine, the present invention is not limited to this and can be applied to, for example, a 6-cylinder or 10-cylinder diesel engine or a gasoline engine. .

[Effect of device]

As described above, according to the intake device for the V-type internal combustion engine according to the present invention, the number of resonance tubes arranged between the left and right bags is reduced, the structure between the two bags is simplified, and the device can be made compact. At the same time, the maintainability of the injection pump arranged between the banks is improved.

In addition, the suction volume efficiencies of the cylinders are equalized, and variations in the output of the cylinders are prevented, and uniformization can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view of an intake system for a V-type internal combustion engine according to an embodiment of the present invention, and FIG. 2 shows a case where a bent resonance pipe and an intake manifold are integrally cast. FIG. 3 and a sectional view are plan views of a conventional intake device. 2a, 2b …… Bank 3 …… Intake port 4 …… Exhaust port 5 …… Exhaust manifold 7 …… Intake manifold 8 …… Resonance tube 11,12 …… Bend resonance tube 20 …… Injection pump.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F02M 35/116 (72) Creator Keiichi Niimura 1-chome, Iocho, Ageo-shi, Saitama Nissan Diesel Industrial Co., Ltd. In-company (72) Inventor Shuichi Nakamura 1-chome, Ichichome, Ageo-shi, Saitama Nissan Diesel Industry Co., Ltd. (56) Reference JP-A-60-62655 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An intake manifold having a predetermined volume is arranged in the left and right banks of a V-type internal combustion engine, in which a plurality of cylinders are arranged, in close proximity to each other.
In an intake device for a V-type internal combustion engine in which an intake port and an exhaust port are formed in each bank, an intake manifold is connected to the intake port, and an exhaust manifold is connected to the exhaust port, the cylinders at both ends of the left and right banks are folded. A bent resonance pipe is connected, and the bent resonance pipe is arranged inside or outside the intake manifold on the same bank side where the intake port is formed, and is connected to the opposite bank to the cylinders other than the both ends of the left and right banks. The resonance pipes are connected to each other, and the bent resonance pipes and the resonance pipes have substantially the same length.