JPH04137255U - Intake manifold - Google Patents

Abstract

(57) [Summary] [Purpose] This invention relates to an intake manifold.
An object of the present invention is to provide an intake manifold capable of suppressing the generation of vortices when distributing intake air from a distributor to each branch pipe and smoothly distributing intake air to branch pipes. [Structure] A plurality of pipe attachment holes 1 are provided in one plate 19 to connect the upstream ends of a plurality of branch pipes 3 and 9.
In the intake manifold formed by connecting the branch pipes 3 and 9 to the distributor 11 through the plate 19, approximately in the center of the plate 19 surrounded by the pipe attachment holes 17, , a rectifying protrusion 21 that protrudes toward the upstream side of the intake air is provided.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an intake manifold installed in a vehicle engine.

0002

[Conventional technology]

As disclosed in Utility Model Application Publication No. 60-178329, etc., conventionally, vehicle engines The intake manifold distributes the air and fuel mixture into each cylinder. is installed. The inner surface of the intake manifold is designed so as not to obstruct the flow of intake air. Although it is smoothly molded, it has recently been introduced to meet the demand for weight reduction. Aluminum alloy branch pipes distribute intake air to each cylinder of the engine. A so-called pipe intake manifold using pipe material is installed on many vehicles. ing.

0003 Figure 3 shows the conventional structure of such a pipe intake manifold, and in the figure, 1 is An intake manifold installed on an inline 4-cylinder engine, which controls each series of the engine. The branch pipes 3, 5, 7, and 9 that distribute intake air to the cylinder are made of aluminum alloy. Ip wood is used. And the upstream side of each branch pipe 3, 5, 7, 9 is , is connected via a plate 13 to a distributor 11 cast from aluminum alloy, and is also connected to a distributor 11 cast from aluminum alloy. On the downstream side of launch pipes 3, 5, 7, and 9, heads are also cast from aluminum alloy. It is connected to the cylinder head of the engine via a flange 15.

0004 Then, the intake air A introduced through the air filter is distributed by the distributor 11. and flows from each branch pipe 3, 5, 7, 9 to the engine intake port. It is designed to be entered.

[0005]

[Problem that the idea aims to solve]

However, conventionally, each of the above-mentioned branch pipes 3, 5, 7, 9 has an upstream end. Because it was inserted into the pipe mounting hole 17 of the plate 13 with a slight gap between them. , when the intake air A is distributed to each branch pipe 3, 5, 7, 9 in the distributor 11. 4, the approximate center of the plate 13 surrounded by each pipe mounting hole 17 (in Part B) acted as a resistance to the intake air A, and a vortex A' was generated in that part.

[0006] When the vortex A' is generated in this way, the ventilation resistance increases and each branch pipe The intake air A cannot be distributed smoothly to 3, 5, 7, and 9, and Also, the generation of vortex A' was a cause of airflow noise. This invention was devised in view of such actual circumstances, and it is possible to connect the distributor to each branch pipe. When distributing the intake air to the branch pipe, it is possible to suppress the generation of vortices and distribute the intake air to the branch pipe. The purpose is to provide an intake manifold that can be smoothly installed. shall be.

[0007]

[Means to solve the problem]

In order to achieve such an objective, the present invention provides into the multiple pipe mounting holes provided on one plate, and then In the intake manifold that connects the branch pipe to the distributor through Approximately in the center of the plate surrounded by each of the above pipe mounting holes, it protrudes toward the upstream side of the intake air. It is equipped with a rectifying protrusion.

[0008]

[Effect]

According to the present invention, the intake air introduced into the distributor is rectified by the rectifying protrusions for each branch. At this time, the intake air is distributed to each branch pipe along the rectifying protrusion. Since the flow smoothly flows into the pipe, no vortices are generated in the distributor.

[0009]

【Example】

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. Furthermore, in Figures 3 and 4 Components that are the same as those in the conventional example shown are given the same reference numerals, and a structural description thereof will be omitted. In Fig. 1, 19 is a plate provided with four adjacent pipe mounting holes 17. , the upstream ends of the four branch pipes 3, 5, 7, and 9 are connected to each pipe mounting hole 17. are inserted and welded all around. Then, the plate 19 is connected to the opening of the distributor 11. Welded to the portion 11a, each branch pipe 3, 5, 7, 9 is connected to the distributor 11. The structure is designed to be Also, similar to the conventional example shown in FIG. 3, each branch pipe 3, 5 , 7, and 9, a head flange 15 is attached.

0010 Therefore, in this embodiment, as shown in FIG. Approximately in the center of the plate 19, there is provided a pipe that protrudes toward the upstream side of the intake air A, and that is connected to each branch pipe. The inner peripheral surfaces of the pipes 3, 5, 7, and 9 are smoothly connected to the outer shape of the rectifying protrusion, which has a substantially spindle-shaped cross section. A rectifying projection 21 is provided integrally with the intake air A, and the rectifying projection 21 directs the intake air A to each branch port. It is designed to flow smoothly to types 3, 5, 7, and 9.

[0011] Since the intake manifold according to this embodiment is configured as described above, the intake manifold according to this embodiment is The intake air A introduced into the distributor 11 through the filter is divided as shown in FIG. It is distributed by the distributor 11 and is distributed from each branch pipe 3, 5, 7, 9 to each engine inlet. It flows into the pipe fitting hole 17 at the approximate center of the plate 19 surrounded by the pipe mounting hole 17. Since the rectifying protrusion 21 having the above-mentioned shape is formed, the intake air A is Flows smoothly along the rectifying protrusion 21 to each branch pipe 3, 5, 7, 9, No vortices are generated within the distributor 11.

0012 Therefore, according to this embodiment, the ventilation resistance due to the eddy current is lower than that of the conventional example shown in FIG. Moreover, the rectifying protrusion 21 is smooth with the inner peripheral surface of the branch pipes 3, 5, 7, and 9. Since the branch pipes 3, 5, 7, 9 is reduced compared to the conventional one, and as a result, each branch pipe 3, 5, 7, The intake air A is distributed smoothly and evenly to 9, and the air is filled into the engine. Efficiency is improved compared to conventional models, and engine output and torque can be significantly increased. became.

[0013] Furthermore, since the generation of eddy currents can be prevented, according to this embodiment, in addition to the above effect, the airflow can be reduced. The noise problem was also resolved. In the above embodiment, the rectifying protrusion 21 is provided integrally with the plate 19, but the plate 19 is A spindle-shaped rectifying protrusion is molded separately from the pipe fitting hole 17, and this is inserted into the pipe mounting hole 17. It may be attached approximately to the center of the enclosed plate 19, and its shape may also be spindle-shaped. The shape is not limited to this, and it may be a cone-shaped rectifying protrusion, for example.

[0014] Furthermore, in the above embodiment, the branch pipes 3, 5, 7, and 9 are made of aluminum alloy pipe material. However, an intake manifold using a branch pipe formed from aluminum alloy casting was used. The present invention can also be applied to Nifold, and is not limited to 4-cylinder engines, but also 6-cylinder engines. This invention can also be applied to intake manifolds for cylinder engines and 8-cylinder engines. Of course you can.

[0015]

[Effect of the idea]

As described above, according to the present invention, the ventilation resistance due to the eddy current and the Distribution of intake air to each branch pipe as the contraction resistance to the branch pipe is reduced is carried out smoothly and evenly, resulting in improved air filling efficiency into the engine. This enabled the engine's output and torque to be significantly increased.

[0016] In addition, since the generation of eddy currents can be prevented, the problem of airflow noise is also solved in addition to the above effect. It was decided that

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of a main part of an intake manifold according to an embodiment of the present invention, showing a connection structure between a branch pipe and a distributor.

FIG. 2 is a perspective view of a plate in one embodiment of the present invention.

FIG. 3 is a perspective view of a conventional intake manifold with a part of the branch pipe cut away.

FIG. 4 is an enlarged sectional view of main parts showing a conventional branch pipe and distributor connection structure.

[Explanation of symbols]

3,5,7,9 Branch pipe 11 Distributor 17 Pipe mounting hole 19 plate 21 Rectification protrusion

Claims (1)

[Scope of utility model registration request] [Claim 1] Multiple branch pipes (3, 5, 7,
9) are inserted into a plurality of pipe attachment holes (17) provided in one plate (19), and the branch pipes (3, 5, 7, 9) are inserted through the plate (19). 9)
In the intake manifold connected to the distributor (11), there is a rectifying protrusion that protrudes toward the upstream side of the intake air at approximately the center of the plate (19) surrounded by the pipe attachment holes (17). (21) An intake manifold characterized by being provided with.