JPH11247727A - Device for introducing blowby gas or the like of internal combustion engine to intake system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the closing of an introducing port by a point of an intake inlet pipe by forming a notch on a part corresponding to the introducing port, of the point of the intake inlet pipe in an intake manifold in a device comprising the introducing port at a downstream side of an throttle valve. SOLUTION: An intake inlet pipe 16 is integrally mounted on an upper face of a surge tank forming a part of an intake manifold 8, and a throttle body 17 is removably connected with an upper edge of the intake inlet pipe 16. An introducing port 29 of the blowby gas is mounted on a more downstream part than a throttle valve, of the throttle body 17, and a notch 30 is formed on a part corresponding to the introducing port 29, of the point 23 of the intake inlet pipe 16. Whereby the closing of the introducing port 29 by the point 23 of the intake inlet pipe 16 can be prevented, and the introducing port 29 can be mounted near the intake inlet pipe 16, which prevents the throttle body 17 from enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine for introducing blow-by gas in a cylinder head cover or a crankcase or purging air or the like from a canister into a portion of an intake system downstream of a throttle valve. Related to the device.

[0002]

2. Description of the Related Art Generally, when a blow-by gas is introduced into a portion of an intake system downstream of a throttle valve, it is necessary that the blow-by gas be introduced into each cylinder substantially equally. In such a case, the blow-by gas introduction port must be provided at a position close to the throttle valve so that the blow-by gas from the introduction port is quickly mixed with the intake air.

[0003] Therefore, Japanese Utility Model Publication No. 5-28 as prior art.
No. 323 discloses a blow-in gas introduction port,
It has been proposed to provide a throttle body connected to an intake inlet pipe of an intake manifold to an internal combustion engine at a portion downstream of a throttle valve provided on the throttle body. On the other hand, Japanese Patent Application Laid-Open
Japanese Patent Application Laid-Open No. 72256/72 discloses that when a throttle body is connected to an intake inlet pipe in an intake manifold of an internal combustion engine, a tip end of the intake pipe is provided with a sealing part for reducing the size and the like. It has been proposed that an O-ring be fitted and then removably inserted into a socket hole provided at the outlet of the throttle body to make connection.

[0004]

However, as in the latter case, the distal end of the intake inlet pipe in the intake manifold is fitted with an O-ring for sealing, and is then provided in the socket hole provided at the outlet of the throttle body. If the throttle body is provided with a blow-by gas introduction port, as in the former case, if the throttle body becomes large, as described in detail below, There was a problem to say.

[0005] That is, in a structure in which the front end portion of the intake inlet pipe in the intake manifold is inserted into a socket hole provided at the outlet of the throttle body after an O-ring for sealing is fitted thereto, The distal end of the tube is inserted into the throttle body in order to prevent the external force from acting on the O-ring by closely or closely approaching the outer peripheral surface to the inner surface of the throttle body. Is relatively long.

In this case, when the blow-by gas introduction port in the throttle body is located at a position near the intake pipe in the intake manifold,
The blow-by gas introduction port is closed at the tip of the intake inlet pipe. To avoid this, the blow-by gas introduction port in the throttle body is located at a position distant from the intake inlet pipe in the intake manifold. Therefore, the throttle body must be configured to be located at a position corresponding to the throttle body, thereby increasing the size of the throttle body.

An object of the present invention is to provide a device which solves this problem.

[0008]

SUMMARY OF THE INVENTION In order to achieve this technical object, the present invention provides an intake manifold for an internal combustion engine including a throttle body having a throttle valve, and a tip end of an intake inlet pipe in the intake manifold. An O-ring for sealing is fitted to and connected to the socket body at the outlet of the throttle body by being removably inserted into the socket hole, and blow-by gas or purge gas is supplied to a portion of the throttle body downstream of the throttle valve. In an internal combustion engine provided with an introduction port for air or the like, a cutout groove is provided in a portion corresponding to the introduction port in a tip end portion of the intake inlet pipe in the intake manifold. "

[0009]

Operation and effect of the present invention
The introduction port provided in the throttle body is blocked at the tip of the intake inlet pipe in the intake manifold.
Since it can be prevented by the notch groove provided at the tip portion, the introduction port in the throttle body is
By providing the notch groove at the tip of the intake inlet pipe, it can be provided in a portion close to the intake inlet pipe.

Therefore, according to the present invention, the connection of the throttle body to the intake inlet pipe in the intake manifold is performed by inserting the tip of the intake inlet pipe into the throttle body. When applying the introduction port for blow-by gas or the like at a position further downstream is applied, there is an effect that the enlargement of the throttle body can be reliably avoided.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention applied to a four-cylinder internal combustion engine.
In this figure, reference numeral 1 denotes four cylinders A1, A2, A
3 and A4 are arranged in series along the axial direction 1a of the crankshaft. A four-cylinder internal combustion engine is shown in FIG.
The intake ports 4, 5, 6, 7 to 2, A3, A4 are open.

Reference numeral 8 denotes an intake manifold for the internal combustion engine 1. This intake manifold 8 includes a surge tank 9 made of a metal plate and four long branch metal branch pipes 10, 11, 12, and 13. One common flange 14 is fixed to one end of each of the branch pipes 10, 11, 12, and 13.
Each of the branch pipes 10, 11, 12, and 13 is disposed on each of the cylinders A with respect to the longitudinal side surface 3 of the cylinder head 2.
They are connected by a plurality of bolts 15 so as to communicate with intake ports 4, 5, 6, 7 to 1, A2, A3, and A4.

As shown in FIG. 1 which is a plan view, the surge tank 9 in the intake manifold 8 is provided with a second one located at the center of the cylinders A1, A2, A3 and A4.
The surge pipe 9 is disposed at a position between the cylinder A2 and the third cylinder A3 and near the longitudinal side surface 3 of the cylinder head 2.
Four connections 18,1 to 0,11,12,13
9, 20 and 21, while each of the branch pipes 1
As shown in FIG. 3, which is a side view as viewed from the axial direction 1a of the crankshaft, the surge tank 9 is disposed on the longitudinal side 3 of the cylinder head 2 with the lengths 0, 11, 12, and 13 aligned to substantially the same length. After extending laterally through the upper side, it curves downward on the outside of the surge tank 9 and further upwards on the lower side of the surge tank 9, so that each connection portion 18, 19, 20 on the lower surface of the surge tank 9 is formed. , 21.

In this case, the four connecting portions 18, 19, 20, 21 on the lower surface of the surge tank 9 are
As shown in FIG. 1 which is a plan view, each of the branches 18, 19, 20, 21 is connected to two branches 19, 20 on the side closer to the internal combustion engine 1. While connecting the branch pipes 11 and 12 from the second cylinder A2 and the third cylinder A3 located at the center of the pipes 10, 11, 12, and 13, the connection parts 18, 19, and
The branch pipes 10, 11, 1 are connected to two connecting portions 18, 21 on the side farther from the internal combustion engine 1, respectively.
The branch pipes 10 and 13 from the first cylinder A1 and the fourth cylinder A4 which are located outside of the cylinders 2 and 13 are connected.

On the other hand, on the upper surface of the surge tank 9, an intake inlet pipe 16 is integrally provided so that the intake inlet pipe 16 projects upward, and a throttle valve ( (Not shown), the throttle body 17 is detachably connected. In this detachable connection, a tip 23 having a step 22 of the intake pipe 16 is integrally provided, and After the O-ring 24 for sealing is fitted on the tip portion 23,
Is removably inserted into a socket hole 25 provided at the outlet of the throttle body 17. The throttle body 17 is pulled out of the intake manifold 8 by fastening a flange 26 integrally provided outside the throttle body 17 to a flange 27 integrally provided outside the intake inlet pipe 16 with a bolt 28. It is fixed to impossible.

A blow-by gas introduction port 29 is provided at a position downstream of the throttle valve in the throttle body 17, while the introduction port 29 of the tip portion 23 of the intake inlet pipe 16 of the intake manifold 8 is provided. The notch groove 30 is provided in a portion corresponding to the above. In addition, this notched groove 30 is shown in FIGS.
As shown in FIG. 3, one of the plurality of mounting bolts 15 of the intake manifold 8 to the internal combustion engine 1 is one of the bolts 15.
By being located on the approximate axis 15a, the bolt is also used to insert a fastening tool into the single bolt 15.

An intake inlet pipe 16 on the upper surface of the surge tank 9 has a cylinder A1, A2, A3 between the throttle body 17 attached thereto and the internal combustion engine 1.
A surge tank 9 is provided to secure a space for arranging a fuel injection valve or a fuel distribution pipe for A4.
The intake inlet pipe 16 is provided in a portion of the upper surface remote from the internal combustion engine 1 and has a tapered shape in which the cross-sectional area of the inside of the intake pipe 16 gradually increases toward the surge tank. Parts 18, 19, 20,
By inclining or curving toward the approximate center of the square arrangement in 21, the intake air flowing into the surge tank 9 from the intake inlet pipe 16 to each of the branch pipes 10, 11, 12, and 13 is formed. Improvement of the distribution property and reduction of the flow resistance are achieved.

As described above, the surge tank 9 is disposed at a position close to the longitudinal side surface 3 of the cylinder head 2 while the branch pipes 10, 11, 12, and 12 connected to the longitudinal side surface 3 of the cylinder head 2 are arranged. 13 extends laterally from the longitudinal side surface 3 of the cylinder head 2 through the upper side of the surge tank 9 in a side view, and then curves downwardly outside the surge tank 9 and further upwardly below the surge tank 9. The surge tank 9 is bent and connected to each of the connecting portions 18, 19, 20, and 21 on the lower surface of the surge tank 9.
Under the condition that it is located in the portion close to the longitudinal side surface 3 of
The long branch pipes 10, 11, 12, 13 for the cylinders A1, A2, A3, A4 can be arranged so as to substantially surround the outside of the surge tank 9. It is possible to greatly reduce the size compared with the related art described in each of the above publications.

The surge tank 9 to which the heavy throttle body 17 is attached is attached to the longitudinal side surface 3 of the cylinder head 2.
When the surge tank 9 is supported on an internal combustion engine such as the cylinder head 2, the bracket is small, extremely simple,
It can be of a lightweight structure. Furthermore, in addition to disposing the surge tank 9 at a substantially central portion of the longitudinal side surface of the cylinder head in the axial direction of the crankshaft in plan view, four connection portions on the lower surface of the surge tank 9 are further provided. By arranging the portions 18, 19, 20, 21 in a substantially square arrangement in plan view, the length of the surge tank 9 along the axis 1a of the crankshaft can be shortened.

By the way, when the connecting portions 18, 19, 20, 21 on the lower surface of the surge tank 9 are arranged in a substantially square shape in plan view, the branch pipes 10, 11, 12, 13 are substantially mutually connected. Under the condition of the same length, the branch pipes 10, 11, 12, and 12 are respectively connected to two of the connection sections 18, 19, 20, and 21 on the side closer to the internal combustion engine 1. 13, the branch pipes 10 and 13 from the first cylinder A1 and the fourth cylinder A4 located outside are connected, while the connection portions 18 and 13 are connected.
The branch pipes 10, 1 are connected to two connecting portions 18, 21, which are farther from the internal combustion engine 1, among the connecting pipes 19, 20, 21.
When the branch pipes 11 and 12 from the second cylinder A2 and the third cylinder A3 located at the center of the first, second and third cylinders A1, 12 and 13 are connected, the connection from the second cylinder A2 and the third cylinder A3 located at the center is established. The outer surfaces 11a and 12a of the branch pipes 11 and 12 are arranged such that the length of the branch pipes 11 and 12 is substantially the same as that of the other branch pipes 10 and 13 from the outer surface of the surge tank 9. 18,
19, 20 and 21, which project from the internal combustion engine 1 by an amount connected to the two connecting portions 18 and 21 farther from the internal combustion engine 1;
The protruding dimension L up to 1a and 12a increases, and the intake manifold 8 becomes larger accordingly.

On the other hand, as described above, the branch pipes 1 are connected to the two connection sections 19, 20 of the connection sections 18, 19, 20, 21 closer to the internal combustion engine 1, respectively.
Second cylinder A located at the center among 0, 11, 12, and 13
While connecting the branch pipes 11 and 12 from the second and third cylinders A3, the two connecting portions 18 and 21 of the connecting portions 18, 19, 20 and 21 farther from the internal combustion engine 1 are connected.
When the branch pipes 10, 13 from the first cylinder A1 and the fourth cylinder A4 located outside of the branch pipes 10, 11, 12, 13 are configured to be connected to each other, Two cylinder A2 and third cylinder A
Outer surface 11 of branch pipes 11 and 12 from 3
a and 12a approach the surge tank 9 in a state where the lengths of the branch pipes 11 and 12 are substantially the same as those of the other branch pipes 10 and 13, and the longitudinal side surfaces 3 of the cylinder head 2 Since it is possible to avoid an increase in the protruding dimension L from the front side to the outer side surfaces 11a and 12a, the intake manifold 8 can be further miniaturized.

Further, as described above, a blow-by gas introduction port 29 is provided at a position downstream of the throttle valve in the throttle body 17, while a tip end 23 of the intake inlet pipe 16 of the intake manifold 8 is provided. The notch groove 30 is provided in a portion corresponding to the introduction port 29, so that the introduction port 29 provided in the throttle body 17 is blocked by the distal end portion 23 of the intake inlet pipe 16 in the intake manifold 8. This can be prevented by the notch groove 30 provided in the front end portion 23, and the introduction port 29 in the throttle body 17 is connected to the front end portion 23 of the intake inlet pipe 16.
Since the notch groove 30 is provided in the portion near the intake inlet pipe 16, that is, the portion near the outlet side end face 17a of the throttle body 17, the enlargement of the throttle body 17 can be reliably avoided. is there.

Although the above-described embodiment has been applied to a four-cylinder internal combustion engine, the present invention is not limited to this, and a three-cylinder internal combustion engine (in this case, three connection portions on the lower surface of the surge tank are used). , One side is the axis 1 of the crankshaft
a is a parallel triangular arrangement) or a six-cylinder internal combustion engine (in this case, six connection portions on the lower surface of the surge tank are formed as a regular hexagon with one side parallel to the axis 1a of the crankshaft). It is needless to say that the same can be applied to the case where the entire intake manifold is made of synthetic resin.

[Brief description of the drawings]

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

FIG. 2 is a front view taken along the line II-II of FIG.

FIG. 3 is a side view taken along the line III-III in FIG. 1;

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is an exploded view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Internal combustion engine A1, A2, A3, A4 Cylinder 2 Cylinder head 3 Longitudinal side of cylinder head 4, 5, 6, 7 Intake port 8 Intake manifold 9 Surge tank 10, 11, 12, 13 Branch pipe 14 Flange 16 Intake inlet pipe 17 Throttle body 18, 19, 20, 21 Connection part 22 Step part 23 Tip part 24 O-ring 25 Socket hole 29 Blow-by gas introduction port 30 Notch groove

Claims (1)

[Claims] An intake manifold for an internal combustion engine is provided with a throttle body provided with a throttle valve, and a leading end of an intake inlet pipe of the intake manifold is fitted with an O-ring for sealing at an outlet of the throttle body. While detachably inserting and connecting in the socket hole,
In an internal combustion engine provided with an introduction port for blow-by gas, purge air, or the like in a portion of the throttle body downstream of the throttle valve, the internal combustion engine corresponds to the introduction port in the tip portion of an intake inlet pipe in the intake manifold. A device for introducing blow-by gas or the like of an internal combustion engine into an intake system, wherein a cutout groove is provided in a portion.