JP2570846Y2 - Inertial intake passage structure of internal combustion engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an inertial intake passage structure of a V-type internal combustion engine.

[0002]

2. Description of the Related Art As a method of increasing the intake efficiency of a V-type internal combustion engine, there is a concept of inertial intake utilizing inertial force of intake, and an intake passage is connected between cylinders having a discontinuous intake stroke and the length thereof is appropriately adjusted. In order to prevent the interference of the intake air, the intake passage structure has been known in which the intake air is efficiently sent to the cylinder. Various proposals have been made with respect to this structure, for example, see Japanese Utility Model Laid-Open No. Sho 59-168569. Are also shown.

[0003] The effective length of the intake passage required for inertial intake is determined by the relationship with the required engine speed at the time of operating the inertial intake. In the case of a V-type internal combustion engine, the effective length of the left and right banks set to the same length is determined. Are often formed symmetrically.

[0004]

By the way, it is required to make the intake passage as compact as possible due to the structure of a vehicle equipped with a V-type internal combustion engine. However, a symmetrical intake passage is sometimes required. This is an obstacle to downsizing the intake passage, and depending on the type of vehicle, there is a case where it is not always possible to set an optimal passage length for inertial intake due to mounting restrictions.

The purpose of the present invention is to solve such a problem.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to an intake branch pipe having at least two independent passages connecting left and right cylinders of a V-type internal combustion engine that do not have continuous intake strokes. A collector to join the tubes,
In an inertial intake passage structure of an internal combustion engine having an intake duct connected upstream of a collector, the intake branch pipe has independent passages parallel to each other at a connection portion with an intake manifold and vertically at a connection portion with a collector. The inside of the collector is divided by a horizontal partition wall so as to be separated into two spaces connected to upper and lower independent passages of the left and right intake branch pipes.

[0007]

[Action] By connecting an intake branch pipe with an independent passage connecting cylinders that do not cause intake interference to the inside and a collector separated inside and below by a partition, the intake branch pipe and the collector are inertial intake action Required compared to maintaining a predetermined inertial intake efficiency only with the intake branch pipe, it is possible to greatly shorten the entire passage length, shortening the intake passage, Miniaturization is achieved.

[0008]

1 to 3 show an embodiment of the present invention.

Reference numerals 1A and 1B denote left and right banks (4 cylinder cylinder blocks each) of a V-type 8-cylinder internal combustion engine.
The intake manifolds 2A and 2B are connected to each of them. The intake stroke is not continuous in the intake manifolds 2A and 2B.
Two internal passages are formed to connect the two cylinders to each other, and these connection ports 3 are opened on the horizontal connection flange surface 4 in a state where they are arranged side by side in the left-right direction. Each intake manifold 2A, 2B has an intake branch pipe 5
A and 5B are connected, and two independent passages 6 connected to the respective connection ports 3 are formed inside each of the intake branch pipes 5A and 5B. The left and right intake branch pipes 5A and 5B are connected to a common collector 7, and the collector 7 has a partition wall 8 for dividing the inside into upper and lower spaces 9A and 9B so as to connect the inside to the respective independent passages 6. Provided.

Therefore, the independent passage 6 formed inside the intake branch pipes 5A and 5B is provided with the intake manifolds 2A and 2A.
B, the opening is parallel in the left-right direction at the connecting portion with the collector B, but the connecting portion with the collector 7 is open in the up-down direction, that is, the opening is vertically overlapped.
Is bent by 90 degrees between both ends.

An inlet duct 10 is connected to the inlet of the collector 7. In this embodiment, an internal passage of the inlet duct 10 is also formed in a space 9 above and below the collector 7 separated by a partition 8.
A and 9B are separated by partition walls (not shown) extending in the axial direction so as to be connected to each other, and a switching valve 11 for short-circuiting the upper and lower passages is provided in the middle thereof. By short-circuiting the upper and lower passages other than the above, the effective length of the independent passage is changed, and the air filling efficiency outside the inertial intake region is also improved.

Incidentally, for the purpose of inertial intake, at least the portions of the intake branch pipes 5A and 5B and the collector 7 may be formed as independent passages connecting cylinders having discontinuous intake strokes. By extending to the intake duct 10 as in this embodiment, it is possible to further shorten the intake passage required as a whole to obtain a predetermined inertial intake effect.

With the above configuration, the intake duct 1
The intake air flowing from 0 into the collector 7 is divided into upper and lower spaces 9A,
It is divided into left and right intake branch pipes 5A and 5B connected to 9B,
The air is drawn into the cylinders of the banks 1A and 1B in the order of the intake stroke. The inertia intake passage having a predetermined length is constituted by the independent passage 6 connecting the cylinders having discontinuous intake strokes and the internal spaces 9A and 9B of the collector 7, so that the influence of intake interference is eliminated in a predetermined rotation region, and the efficiency is improved. Intake can be supplied to each cylinder well.

As described above, since the inertial intake passage is formed by separating not only the intake branch pipes 5A and 5B but also the inside of the collector 7 with the partition wall 8, the effective length of the intake passage required for inertial intake is reduced. In order to secure the intake passage, the entire intake passage can be significantly shortened as compared with the conventional one using only the branch pipe, and the size of the intake passage can be reduced.

[0015]

As described above, according to the present invention, the left and right intake branch pipes of the left and right banks of the V-type internal combustion engine having at least two independent passages connecting the cylinders that do not have continuous intake strokes are provided. In the inertial intake passage structure of the internal combustion engine including a collector that joins the intake branch pipes and an intake duct connected upstream of the collector, the intake branch pipes have independent passages parallel to each other at a connection portion with the intake manifold. And, it is formed by twisting so as to overlap vertically at the connection part with the collector, and the inside of the collector is separated into two spaces by a horizontal partition so as to be connected to the upper and lower independent passages of the left and right intake branch pipes. The intake branch pipe and the collector can be provided as passages necessary for the inertial intake action, and compared with maintaining the predetermined inertial intake efficiency only with the branch pipe, the overall flow rate can be improved. It is possible to greatly shorten the length, the shortening of the intake passage, downsizing is achieved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a perspective view of a main part of the same.

[Explanation of symbols]

 1A Bank 1B Bank 2A Intake manifold 2B Intake manifold 5A Intake branch pipe 5B Intake branch pipe 6 Independent passage 7 Collector 8 Partition wall 9A Space 9B Space 10 Intake duct

Claims (1)

(57) [Scope of request for utility model registration] 1. An intake branch pipe having at least two independent passages in left and right banks of a V-type internal combustion engine for connecting cylinders having discontinuous intake strokes to each other, a collector joining the left and right intake branch pipes, In an inertial intake passage structure of an internal combustion engine having an intake duct connected upstream of a collector, the intake branch pipe has independent passages parallel to each other at a connection portion with an intake manifold and vertically at a connection portion with a collector. The internal combustion engine is formed by twisting in the middle so as to overlap, and the inside of the collector is partitioned by a horizontal partition so as to be separated into two spaces connected to upper and lower independent passages of the left and right intake branch pipes. Inertial intake passage structure.