JP7310958B1 - Intake manifold connection structure - Google Patents

Abstract

An intake manifold connection structure capable of suppressing temperature rise of air passing through the intake manifold and easily adjusting the flow characteristics of the air is provided. An intake manifold connection structure (100) includes a cylinder head (1) formed with an intake port for taking air into an engine, an intake manifold (2) connected to the cylinder head and guiding air to the intake port, and an adapter 3 disposed between the cylinder head and the intake manifold. The adapter 3 includes a plate portion 31 sandwiched between the cylinder head and the intake manifold, and a A tubular portion 32 formed to protrude and inserted into the intake port has a tubular portion 32 through which the air from the intake manifold 2 passes. [Selection drawing] Fig. 1

Description

The present invention relates to an intake manifold connection structure.

BACKGROUND ART Conventionally, there is known a configuration in which an intake manifold is connected to a cylinder head of an engine via a gasket (see, for example, Patent Literature 1).

Published utility model publication No. 3-106150

Since the cylinder head becomes hot during engine operation, it is necessary to prevent the heat from the cylinder head from being transferred to the intake manifold. On the other hand, the cylinder head has a problem that the flow of air in the intake port cannot be easily changed.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an intake manifold connection structure that suppresses the temperature rise of the air passing through the intake manifold and allows the flow characteristics of the air to be easily adjusted. aim.

One aspect of the present invention includes a cylinder head formed with an intake port for drawing air into an engine, an intake manifold connected to the cylinder head and guiding air to the intake port, the cylinder head and the intake. an adapter arranged between the manifold and the manifold, wherein the adapter is formed so as to protrude from a plate-shaped plate portion sandwiched between the cylinder head and the intake manifold; Provided is an intake manifold connection structure having a tubular portion to be inserted through which the air from the intake manifold passes.

The adapter may be a resin component in which the gasket portion and the cylindrical portion are integrally molded.

The tip of the tubular portion may be formed so as to be inclined with respect to the axial direction of the tubular portion.

A plurality of the cylindrical portions are formed in the plate portion, and the plurality of cylindrical portions have a first cylindrical portion having a first cross-sectional shape and a cross-sectional area different from the cross-sectional area of the first cross-sectional shape. and a second cylindrical portion having a second cross-sectional shape.

The intake manifold may have a flange portion connected to the cylinder head by a fixing bolt, and the intake manifold connection structure is such that the head portion of the fixing bolt and the cylinder head side surface of the flange portion are separated from each other. A heat insulating washer may be further provided between the opposing surface.

The flange portion may be formed with a recess having the same shape as the contour of the heat insulating washer and into which the heat insulating washer is fitted.

ADVANTAGE OF THE INVENTION According to this invention, the intake manifold connection structure which can suppress the temperature rise of the air which passes through an intake manifold, and can adjust the flow characteristic of air easily can be provided.

It is a sectional view showing an intake manifold connection structure. It is a perspective view which shows the external appearance of an adapter typically. FIG. 10 is a cross-sectional view showing a modification of the intake manifold connection structure; It is a schematic diagram which shows an example of the cylindrical part from which cross-sectional shapes differ. It is a cross-sectional view of an adapter that is a modification. FIG. 6 is a cross-sectional view showing a state in which the adapter of FIG. 5 is attached;

An intake manifold connection structure 100 according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an intake manifold connection structure 100. FIG.

The intake manifold connection structure 100 is provided in, for example, a diesel engine, and includes a cylinder head 1, an intake manifold 2, and an adapter 3.

The cylinder head 1 is a metal part that forms part of the engine. The cylinder head 1 has an intake port 11 that takes in air taken into the engine. Although only one intake port 11 is shown in FIG. 1 , a plurality of intake ports 11 are formed in the cylinder head 1 .

The intake manifold 2 is a component connected to the cylinder head 1 . The intake manifold 2 is a metal part or a resin part molded using a material suitable for injection molding. The intake manifold 2 has a conduit portion 21 and a flange portion 22 .

The conduit portion 21 forms a flow path 21 a that guides air to the intake port 11 of the cylinder head 1 . The flange portion 22 is formed at the end portion of the conduit portion 21 . The flange portion 22 is a structural portion for connecting the intake manifold 2 to the cylinder head 1 . Through-holes into which the fixing bolts 4 are inserted are formed in the flange portion 22 . The flange portion 22 is attached to the cylinder head 1 by tightening the fixing bolts 4 .

(Adapter 3)
FIG. 2 is a perspective view schematically showing the appearance of the adapter 3. As shown in FIG. Adapter 3 is arranged between cylinder head 1 and intake manifold 2 . The adapter 3 has a plate portion 31 and a tubular portion 32 .

The adapter 3 is, for example, a resin component in which a plate portion 31 and a cylindrical portion 32 are integrally molded. The material of the adapter 3 preferably has low thermal conductivity. Specifically, the material of the adapter 3 preferably has a thermal conductivity of 1/100 or less, such as 1/500 or less, of the thermal conductivity of the metal material forming the cylinder head 1, for example. is more preferable.

Since the temperature of the cylinder head 1 becomes high during the operation of the engine, the heat from the cylinder head 1 is easily transferred to the intake manifold 2 . When the temperature of the intake manifold 2 becomes high, the temperature of the air passing through the intake manifold 2 also rises, the intake air temperature of the engine rises, and the engine thermal efficiency decreases. When the adapter 3 made of a material with low thermal conductivity is provided between the cylinder head 1 and the intake manifold 2 as in this embodiment, the intake manifold 2 can be prevented from becoming hot. Therefore, an increase in intake air temperature of the engine is suppressed, and the combustion efficiency of the engine is improved.

The plate portion 31 is formed in a plate shape and is a portion sandwiched between the cylinder head 1 and the adapter 3 . The plate portion 31 is formed with a through hole 31h through which the fixing bolt 4 (see FIG. 1) is passed. In addition, in FIG. 2, only some holes 31h are illustrated. Although not shown in FIG. 1 , sealing parts (gaskets) are arranged between the plate portion 31 and the cylinder head 1 and between the plate portion 31 and the intake manifold 2 .

The cylindrical portion 32 is a cylindrical portion that protrudes from the plate portion 31 . The tubular portion 32 extends in the thickness direction of the plate portion 31 and protrudes away from the plate portion 31 . An inner hole 32 a of the tubular portion 32 extends through the plate portion 31 .

As shown in FIG. 1 , the adapter 3 is arranged such that the tubular portion 32 is inserted into the intake port 11 of the cylinder head 1 . The inner hole 32a of the cylindrical portion 32 forms part of a flow path through which the air sent out from the intake manifold 2 passes.

The inner diameter of the inner hole 32a is not limited to a specific dimension. However, as a specific example, for example, the inner diameter of a portion (inlet portion) of the inner hole 32a adjacent to the intake manifold 2 is the same as the inner diameter of the flow path 21a, and The inner diameter of the adjacent portion (outlet portion) may be the same as the inner diameter of the intake port 11 . According to such a configuration, since the inner diameter of the flow path does not change at the connecting portion between the members, the air can flow smoothly.

According to the configuration of this embodiment, the shape of the inner hole 32a of the adapter 3 attached to the cylinder head 1 is appropriately changed, so that the cross-sectional shape of the flow path through which the air flows can be changed. Therefore, without changing the shape of the intake port 11 of the cylinder head 1 itself, the cross-sectional shape of the flow path can be changed to adjust the flow characteristics of the air.

(Effect)
As described above, in the intake manifold connection structure 100 of the present embodiment, since the adapter 3 is arranged between the cylinder head 1 and the intake manifold 2, the intake manifold 2 is prevented from becoming hot. Therefore, an increase in intake air temperature of the engine is suppressed, and the thermal efficiency of the engine is improved. Further, in the configuration of this embodiment, the tubular portion 32 of the adapter 3 is inserted into the intake port 11 of the cylinder head 1 . Therefore, by changing the shape of the inside of the cylindrical portion 32, the flow characteristics of the air taken into the engine can be easily adjusted.

<Modification 1>
FIG. 3 is a cross-sectional view showing a modification of the intake manifold connection structure. As shown in FIG. 3 , a heat insulating washer 5 may be provided between the intake manifold 2 and the fixing bolt 4 . As with the adapter 3 , the heat insulating washer 5 has, for example, a thermal conductivity that is 1/100 or less of the thermal conductivity of the metal material forming the cylinder head 1 .

The heat insulating washer 5 is arranged between the head 4a of the fixing bolt 4 and the surface of the flange portion 22 of the intake manifold 2 opposite to the surface facing the cylinder head. The head portion 4 a of the fixing bolt 4 does not contact the flange portion 22 of the intake manifold 2 due to the provision of the heat insulating washer 5 .

The surface of the flange portion 22 on which the heat insulating washer 5 is arranged may be formed flat, but in the example of FIG. The concave portion 22a is a structural portion in which the heat insulating washer 5 is fitted. The shape (contour shape) of the recess 22a may be formed in the same shape as the contour of the heat insulating washer 5, as an example. "Same shape" also includes substantially the same shape. For example, the "same shape" includes a case where one shape is slightly larger than the other shape in consideration of dimensional errors and workability during assembly.

As a specific example, when the contour of the heat insulating washer 5 is circular, the recess 22a is also formed circular. The size of the recess 22a may be formed to be one size larger than the size of the heat insulating washer 5 so that the heat insulating washer 5 can be easily arranged.

According to the configuration in which the heat insulating washer 5 is arranged in the concave portion 22a as in the configuration of FIG.

According to the configuration shown in FIG. 3 , since the heat insulating washer 5 is provided, the heat transmitted from the cylinder head 1 to the fixing bolt 4 is less likely to be transmitted to the intake manifold 2 . As a result, the intake manifold 2 is further prevented from becoming hot, and the thermal efficiency of the engine is further improved.

<Modification 2>
When the adapter 3 has a plurality of tubular portions 32 as shown in FIG. 2, the tubular portions 32 may all have the same shape, or may have different shapes. FIG. 4 is a schematic diagram showing an example of a tubular portion having a different cross-sectional shape.

As shown in FIG. 4, the adapter may have a first tubular portion 32-1 and a second tubular portion 32-2 with different cross-sectional shapes. As an example, the first tubular portion 32-1 has a first cross-sectional shape with a relatively small cross-sectional area, and the second tubular portion 32-2 has a second cross-sectional shape with a relatively large cross-sectional area. have.

Specifically, a protrusion 32b protruding toward the inside of the flow path is formed inside the first tubular part 32-1, and the flow path is formed inside the second tubular part 32-2. A protruding portion 32c protruding inward is formed.

In this way, by providing the projecting portion 32b and the projecting portion 32c having different shapes inside the first cylindrical portion 32-1 and the second cylindrical portion 32-2, the cross-sectional shape of the flow path can be easily changed. can. Therefore, when it is necessary to make the intake characteristics of one intake port 11 of the cylinder head 1 different from the intake characteristics of another intake port 11, it is possible to cope with this without machining the cylinder head 1 itself.

<Modification 3>
The tip surface of the cylindrical portion 32 may be perpendicular to the axial direction of the cylindrical portion 32 as in the examples of FIGS. 1 and 2, but the present invention is not limited to this. FIG. 5 is a cross-sectional view of a modified adapter 3'. FIG. 6 is a sectional view showing a state in which the adapter 3' of FIG. 5 is attached.

The adapter 3' has a plate portion 31 and a tubular portion 32'. The tip of the tubular portion 32' is formed to be inclined with respect to the axial direction Ax. According to the configuration in which the tip of the cylindrical portion 32' is inclined in this way, the cylindrical portion 32' can be easily inserted into the intake port 11 of the cylinder head 1, so there is an advantage that the adapter 3' can be easily attached to the cylinder head 1. be.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist thereof. be. For example, all or part of the device can be functionally or physically distributed and integrated in arbitrary units. In addition, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

1 Cylinder head 2 Intake manifold 3 Adapter 3' Adapter 4 Fixing bolt 4a Head 5 Heat insulating washer 11 Intake port 21 Conduit portion 21a Flow path 22 Flange portion 22a Recess 31 Plate portion 31h Hole 32 Cylindrical portion 32' Cylindrical portion 32- 1 First tubular portion 32-2 Second tubular portion 32a Inner hole 32b Projection 32c Projection 100 Intake manifold connection structure Ax Axial direction

Claims (5)

A metal cylinder head formed with an intake port for sucking air into the engine;
an intake manifold connected to the cylinder head and guiding air to the intake port;
an adapter made of a material having a lower thermal conductivity than the cylinder head and arranged between the cylinder head and the intake manifold;
with
The adapter is
a plate-shaped plate portion sandwiched between the cylinder head and the intake manifold;
A tubular portion formed to protrude from the plate portion and inserted into the intake port, wherein a tip end of the tubular portion is formed to be inclined with respect to an axial direction of the tubular portion, and the a cylindrical portion through which the air from the intake manifold passes;
has
The distal end of the cylindrical portion is formed to be inclined such that the amount of protrusion on the lower side in the vertical direction of the cylinder head is larger than the amount of protrusion on the upper side.
Intake manifold connection structure. The adapter is a resin component in which the plate portion and the cylindrical portion are integrally molded,
The intake manifold connection structure according to claim 1. A plurality of the cylindrical portions are formed in the plate portion,
The plurality of cylindrical parts are
a first tubular portion having a first cross-sectional shape;
a second tubular portion having a second cross-sectional shape having a cross-sectional area different from the cross-sectional area of the first cross-sectional shape,
The intake manifold connection structure according to claim 1 or 2 . The intake manifold has a flange portion connected to the cylinder head by a fixing bolt,
further comprising a heat insulating washer disposed between the head of the fixing bolt and a surface of the flange portion opposite to the surface facing the cylinder head,
The intake manifold connection structure according to any one of claims 1 to 3 . The flange portion is formed with a recess having the same shape as the contour of the heat insulating washer and into which the heat insulating washer is fitted.
The intake manifold connection structure according to claim 4 .