JPH0653725U - Inertial intake passage structure of internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] To shorten and downsize the inertial intake passage. [Structure] Intake manifolds 5A, 5B having at least two independent passages 6 that connect cylinders of the left and right banks 1A, 1B that do not have continuous intake strokes, and these intake branch pipes 5A, 5B are merged. And a collector 7.
The intake branch pipes 5A and 5B are formed so that the independent passages 6 are parallel to each other at the connection portion with the intake manifold and vertically overlap at the connection portion with the collector 7.
The inside of the collector 7 is a horizontal partition wall 8 so as to be connected to the upper and lower independent passages 6 of the left and right intake branch pipes 5A and 5B.
Partition into two spaces 9A and 9B.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of the inertial intake passage structure of a V-type internal combustion engine.

[0002]

[Prior art]

 As a method of increasing the intake efficiency of a V-type internal combustion engine, there is the idea of inertial intake using the inertial force of intake air. The intake passage is connected between cylinders that do not have continuous intake strokes, and the length is set appropriately. As a result, there is known an intake passage structure in which intake air is efficiently sent to a cylinder while preventing intake interference, and there have been various proposals regarding this, for example, in Japanese Utility Model Laid-Open No. 59-168569. It is shown.

The effective length of the intake passage required for the inertial intake is determined by the relationship with the required engine speed when operating the inertial intake, and in the case of a V-type internal combustion engine, the left and right bar lengths are set to the same length. Intake passages from the fuel tank are often formed symmetrically.

[0004]

[Problems to be solved by the device]

 By the way, although it is required to make the intake passage as compact as possible due to the structure of the vehicle equipped with the V-type internal combustion engine, the intake passage having the symmetrical structure is sometimes an obstacle to miniaturization of the intake passage. Therefore, depending on the type of vehicle, it was not always possible to set the optimum path length for inertial intake due to mounting restrictions.

The present invention aims to solve such problems.

[0006]

[Means for Solving the Problems]

 The present invention is an intake branch pipe having at least two independent passages that connect cylinders whose intake strokes are not continuous in the left and right banks of a V-type internal combustion engine, a collector that joins these left and right intake manifolds, and a collector. In an inertial intake passage structure for an internal combustion engine that includes an intake duct connected upstream of the intake manifold, independent passages of the intake branch pipe are parallel to each other at a connection portion with the intake manifold, and the intake branch pipe is vertically arranged at a connection portion with a collector. It is formed by twisting the middle so as to overlap, and the inside of the collector is partitioned by a horizontal partition wall so as to be separated into two spaces that are connected to the upper and lower independent passages of the left and right intake manifolds.

[0007]

[Action]

 The intake branch pipe and the collector are required for inertial intake action by connecting the intake branch pipe with an independent passage that connects the cylinders that do not cause intake interference to the inside, and the collector that is separated inside by the partition wall. It is possible to reduce the size of the intake passage and reduce the size of the intake passage by significantly reducing the total length of the passage compared to maintaining a predetermined inertial intake efficiency with only the intake branch pipe. Is achieved.

[0008]

【Example】

 1 to 3 show an embodiment of the present invention.

Reference numerals 1A and 1B denote left and right banks of a V-type 8-cylinder internal combustion engine (cylinder blocks each having 4 cylinders), to which intake manifolds 2A and 2B are connected. The intake manifolds 2A, 2B are formed with two internal passages that connect two cylinders whose intake strokes are not continuous to each other, and these connection ports 3 are arranged side by side on the horizontal connecting flange surface 4 in the horizontal direction. Open each with. Intake branch pipes 5A and 5B are connected to the intake manifolds 2A and 2B, respectively, and two independent passages 6 connected to the connection ports 3 are formed inside the intake branch pipes 5A and 5B. The left and right intake branch pipes 5A and 5B are connected to a common collector 7. The collector 7 is divided into upper and lower spaces 9A and 9B so that the inside is connected to the respective independent passages 6. 8 are provided.

Therefore, the independent passages 6 formed inside the intake branch pipes 5A, 5B are opened in parallel in the left-right direction at the connection portion with the intake manifolds 2A, 2B, but are connected with the collector 7. The portions are opened in parallel in the vertical direction, that is, so as to overlap with each other in the vertical direction, so that each independent passage 6 is bent and formed in a state of being twisted by 90 degrees until reaching both ends.

A combined intake duct 10 is connected to the inlet of the collector 7, and in this embodiment, the internal passages of the intake duct 10 are also connected to the upper and lower spaces 9 A and 9 B of the collector 7, which are separated by a partition wall 8. Is partitioned by a partition wall (not shown) extending in the axial direction, and a switching valve 11 that short-circuits the upper and lower passages is provided in the middle thereof, and the upper and lower passages are provided outside the rotational region for inertial intake. By short-circuiting, the independent passage effective length is changed, and the intake filling efficiency in the areas other than the inertial intake area is also improved.

For the purpose of inertial intake, at least the intake branch pipes 5A, 5B and the collector 7 should be provided as independent passages connecting cylinders that do not have continuous intake strokes. Accordingly, by extending to the portion of the intake duct 10 as in this embodiment, it is possible to shorten the intake passage as a whole necessary for obtaining a predetermined inertial intake effect.

With the above configuration, the intake air that has flowed into the collector 7 from the intake duct 10 is divided into the left and right intake branch pipes 5A and 5B connected to the upper and lower spaces 9A and 9B, respectively. The air is taken into the cylinder in the order of the intake stroke. The independent passage 6 connecting the cylinders that do not have continuous intake strokes and the internal spaces 9A and 9B of the collector 7 constitute an inertial intake passage of a predetermined length, so that the influence of intake interference is eliminated in a predetermined rotation region. Intake can be efficiently supplied to each cylinder.

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

[0015]

As described above, according to the present invention, an intake branch pipe having at least two independent passages that connect cylinders in the left and right banks of a V-type internal combustion engine that do not have continuous intake strokes to each other, and In an inertial intake passage structure for an internal combustion engine that includes a collector that joins the left and right intake branch pipes and an intake duct that is connected upstream of the collector, the intake branch pipes have independent passages that are parallel to each other at a connection portion with the intake manifold. In addition, it is formed by twisting so that it overlaps 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 connect with the upper and lower independent passages of the left and right intake branch pipes. Therefore, the intake branch pipe and the collector can be used as the passages required for the inertial intake action, and compared to maintaining the predetermined inertial intake efficiency only with the branch pipe, The passage length of the body can be greatly shortened, and the intake passage can be shortened and downsized.

[Brief description of 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 the same main portion.

[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 9A space 9B space 10 intake duct

[Procedure amendment]

[Submission date] January 28, 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]

Claims (1)

[Scope of utility model registration request] 1. An intake branch pipe having at least two independent passages connecting cylinders whose intake strokes are not continuous in the left and right banks of a V-type internal combustion engine, and a collector which joins these left and right intake branch pipes. In an inertial intake passage structure of an internal combustion engine including an intake duct connected upstream of a collector, in the intake branch pipe, independent passages are parallel to each other at a connection portion with an intake manifold, and are vertically arranged at a connection portion with a collector. An internal combustion engine characterized by being formed by twisting in the middle so that the inside of the collector is divided by a horizontal partition wall so as to be separated into two spaces connected to the upper and lower independent passages of the left and right intake branch pipes. Inertial intake passage structure.