JP5757607B2 - Intake device for internal combustion engine - Google Patents

Description

  The present invention relates to an intake device having a function of introducing blow-by gas in a multi-cylinder internal combustion engine having a plurality of cylinders.

Conventionally, in an intake apparatus of this type, for example, Patent Document 1, an intake side intake port is opened to the respective cylinders of the cylinder head in internal combustion engine, the intake manifold, the flange connection by bolting a plurality of The blow-by gas intake port to the intake manifold and the blow-by gas discharge port from the gas-liquid separation chamber provided in the head cover in the internal combustion engine are connected via a blow-by gas extraction hose. It was a configuration.

Proposal contrast, Patent Document 2, at the same time as when installing at flange joining the intake manifold to the internal combustion engine, the blow-by gas intake port in the intake manifold, to connect to the blow-by gas discharge port in an internal combustion engine doing.

JP 09-137709 A Japanese Patent Application No. 2008-106627

However, according to the configuration of the Patent Document 2, the intake manifold, the flange portion with respect to the blow-by gas intake port, the internal combustion engine, because must be provided in each integrally a flange portion with respect to the blow-by gas discharge port, In addition to incurring increased space and weight, there was a problem of extra assembly work due to the flange connection.

  The present invention has a technical problem to solve this problem.

In order to achieve this technical problem, claim 1
An intake side intake port is opened to the respective cylinders of the side surfaces in the "shea cylinder head, in an internal combustion engine comprising an intake manifold mounted in bolts of several double,
A blowby gas discharge port having an inlet and an outlet for blowby gas is formed in the cylinder head such that the inlet opens at the upper surface of the cylinder head and the outlet opens at the intake side of the cylinder head,
While the intake manifold is provided with a blow-by gas intake port communicating with the outlet of the blow-by gas discharge port ,
A head cover attached to the upper surface of the cylinder head is formed with a gas-liquid separation chamber for blow-by gas and a pocket portion into which blow-by gas that has passed through the gas-liquid separation chamber flows, It is arranged to communicate with the blow-by gas discharge port provided on the head. ''
It is characterized by that.

Claim 2
“In the description of claim 1,“ the gas-liquid separation chamber and the blow-by gas discharge port communicate with each other through a passage formed in the head cover ”
It is characterized by that.

Claim 3
“ A PCV valve for the gas-liquid separation chamber is attached to the head cover, and the PCV valve and the pocket portion communicate with each other via a blow-by gas extraction hose disposed outside the head cover. ”
It is characterized by that.

According to claim 1, at the same time as giving preparative intake manifold to the internal combustion engine, the blow-by gas intake port in the intake manifold, may be communicatively connected to the blow-by gas discharge port in the cylinder head.

  As a result, there is no need to provide a separate flange portion for connecting the blow-by gas intake port to the blow-by gas discharge port, so that not only can the space required for communication and connection be greatly reduced, but also the weight can be reduced. In addition, the number of steps required for connection assembly can be reduced.

  According to claim 2, the blow-by gas extraction hose described in Patent Document 1 can be omitted.

Furthermore, although according to claim 3 which requires a blanking Robaigasu extraction hose, the length of the blow-by gas extraction hose, said than if the Patent Document 1 can be significantly shortened.

It is a top view of the internal combustion engine in a 1st embodiment. FIG. 2 is a sectional view taken along line II-II in FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 1. FIG. 4 is a side view taken along the line IV-IV in FIG. 1. It is sectional drawing which shows 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 show a first embodiment.

In these figures, reference numeral 1 denotes an internal combustion engine, the internal combustion engine 1 includes a cylinder block 2, detachably fastened to the cylinder head across a sealing gasket (not shown) on the upper surface of the cylinder block 2 3 and a synthetic resin head cover 4 which is detachably fastened so as to seal the valve mechanism chamber 3a with a sealing gasket 5 sandwiched between the upper surface of the cylinder head 3 and arranged in a row along the crank axis 6. Are provided with three cylinders 7 arranged in a row.

An intake port 9 to the cylinder 7 is opened on one longitudinal side surface (intake side surface) 8 of left and right longitudinal side surfaces parallel to the crank axis 6 among the side surfaces of the cylinder head 3.

  An exhaust manifold (not shown) is joined to the other of the left and right longitudinal sides.

  Reference numeral 10 denotes an intake manifold for the internal combustion engine 1. The intake manifold 10 includes a surge tank 12 to which an intake pipe 11 from an air cleaner (not shown) is connected, and three cylinders extending from the surge tank 12 for each cylinder 7. And the branch pipe 13.

In the case of the present embodiment, each branch pipe 13 is bent so as to surround the surge tank 12 from the outside as viewed from the direction of the crank axis 6.

To the intake manifold 10, the provided flange 14 which is the configuration for connecting the mutual-edge of the branch pipes 13 are provided integrally, the flange portion 14, the one longitudinal side (intake side) 8 is fastened by a plurality of bolts 16 with a sealing gasket 15 sandwiched therebetween. That is, the intake manifold 10 is removably attached at flange connection to the cylinder head 3, by the flange connection, the each branch pipe 13 is communicatively connected to the intake port 9 of the each cylinder 7.

In portion between the respective intake ports 9 of the cylinder head 3, and, wherein the one longitudinal side portion adjacent to the (intake side) 8, blanking Robaigasu exhaust port 17 having an inlet and outlet, inlet The cylinder head 3 is formed so as to open on the upper surface and have an outlet opening on both one long side surface (intake side surface) 8 of the cylinder head 3 .

  As described above, the blow-by gas discharge port 17 is not limited to opening at a portion between the intake ports 9, but may be configured to open at a portion adjacent to one intake port 9. The blow-by gas discharge port 17 is formed by punching from the upper surface of the cylinder head 3 and the one long side surface (intake side surface) 8 and the one long side surface ( The configuration is substantially perpendicular to the intake side surface 8.

On the other hand, wherein the portion corresponding to the blow-by gas discharge port 17 of the intake manifold 10, forming a blow-by gas inlet port 18 communicating with the sub Jitanku 12, so as to open the joint surface of the front Symbol flange 14 by, and the intake manifold 10 to the configuration that against the cylinder head 3 at the same time as the mounting at the flange connection, communicatively Interfacing with the said blow-by gas inlet port 18 and the blanking Robaigasu exhaust port 17.

  In this case, a gasket 15 sandwiched between the flange portion 14 of the intake manifold 10 and the one longitudinal side surface (intake side surface) 8 communicates and connects the blowby gas intake port 18 and the blowby gas discharge port 17. It also serves as a sealing gasket.

The blow-by gas intake port 18 opens in the direction substantially perpendicular to the one longitudinal side surface (intake side surface) 8, as with the blow-by gas discharge port 17 .

A gas-liquid separation chamber 19 for blow-by gas is formed in the head cover 4, and the gas-liquid separation chamber 19 is connected to the blow-by gas via a pocket portion 20 and a passage 21 formed in the head cover 4. It is made to communicate with the exhaust port 17.

This communication is performed by fastening the head cover 4 to the cylinder head 3 .

In this arrangement, the blow-by gas collected in the valve operating mechanism chamber 3a of the cylinder head 3 of the internal combustion engine 1, wherein after being gas-liquid separation as the oil is removed, via the passage 21 and the pocket portion 20 The blow-by gas discharge port 17 is reached, and the blow-by gas discharge port 17 is sucked into the surge tank 12 through the blow-by gas intake port 18 in the intake manifold 10.

  In this case, a portion of the cylinder head 3 inside the blow-by gas discharge port 17 is provided with a cooling water jacket 22 as shown in FIG. The temperature is set as low as possible.

FIG. 5 shows another embodiment.

This alternative embodiment, the synthetic resin head cover 4, while providing the PCV valve 23 with respect to the gas-liquid separation chamber 19, a pocket portion 20 and the gas-liquid separation chamber 19 in the interior of the head cover 4 is Hirendori configured to have a configuration that connects by the PCV valve 23 and the front Symbol pocket 20 Toobu Robaigasu extraction hose 24.

  As is well known in the art, the PCV valve 23 is configured to open in the direction toward the intake manifold 10 when a negative pressure is generated in the intake manifold 10 that is lower than the atmospheric pressure. It is. The blow-by gas extraction hose 24 includes a hose port 24a provided integrally with the head cover 4 so as to protrude from the gas-liquid separation chamber 19, and a hose port provided integrally with the pocket part 20. 24b, both ends are inserted and connected, and as shown in the figure, it is inclined obliquely downward from the hose port 24a on the gas-liquid separation chamber 19 side toward the hose port 24b of the pocket portion 20.

According to this alternative embodiment, the opening and closing operation of the PCV valve 23, yet as it can be examined point by to loosen grip or hold the blow-by gas extraction hose 24, the blowby The length of the gas extraction hose 24 can be made shorter than when the gas-liquid separation chamber 19 and the intake manifold 10 are connected by the blow-by gas extraction hose.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 3 Cylinder head 4 Head cover 7 Cylinder 8 Intake side surface 9 Intake port 10 Intake manifold 12 Surge tank 13 Branch pipe 14 Flange part 15 Gasket 17 Blow-by gas discharge port 18 Blow-by gas intake port 19 Gas-liquid separation chamber
20 Pocket part 23 PCV valve 24 Blow-by gas extraction hose

Claims (3)

An intake side intake port is opened to the respective cylinders of the side surfaces of the sheet cylinder head, in an internal combustion engine comprising an intake manifold mounted in bolts of several double,
A blowby gas discharge port having an inlet and an outlet for blowby gas is formed in the cylinder head such that the inlet opens at the upper surface of the cylinder head and the outlet opens at the intake side of the cylinder head,
While the intake manifold is provided with a blow-by gas intake port communicating with the outlet of the blow-by gas discharge port ,
A head cover attached to the upper surface of the cylinder head is formed with a gas-liquid separation chamber for blow-by gas and a pocket portion into which blow-by gas that has passed through the gas-liquid separation chamber flows, It is arranged to communicate with the blow-by gas discharge port provided on the head.
Intake device in an internal combustion engine. In the description of claim 1, the gas-liquid separation chamber and the blow-by gas discharge port communicate with each other through a passage formed in the head cover.
Intake device in an internal combustion engine. 2. The head cover according to claim 1, wherein a PCV valve for the gas-liquid separation chamber is attached to the head cover, and the PCV valve and the pocket portion are connected via a blow-by gas extraction hose disposed outside the head cover. Communicating,
Intake device in an internal combustion engine.

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