JP4423243B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine.

Conventionally, as this type of internal combustion engine, as disclosed in Patent Document 1, for example, a head cover that includes a gas-liquid separation device that separates oil in blow-by gas has been proposed.
In this internal combustion engine, the oil component in the blow-by gas is separated by a gas-liquid separator, and the blow-by gas from which the oil component has been separated is recirculated to the intake system to be recombusted.
JP 2002-242646 A

  However, in such an internal combustion engine, since the inside of the head cover is relatively hot, there has been a case where the oil content in the blow-by gas cannot be sufficiently separated.

  The present invention has been devised in view of the above-mentioned conventional problems. One of the objects is to improve the gas-liquid separation performance, and one object is to reduce the number of parts, and further suppresses vibration. An object of the present invention is to provide a gas-liquid separation means capable of separating oil in blow-by gas, and an upper surface of a head cover into which the blow-by gas separated by the gas-liquid separation means is introduced. In the internal combustion engine including the intake manifold, the gas-liquid separation means is integrally formed with the collecting portion of the intake manifold, and is a means for fixing and supporting the collecting portion on the upper surface of the head cover.

  According to a second aspect of the present invention, the gas-liquid separation means includes a first communication portion that communicates with the interior of the head cover, and a second communication portion that communicates with the interior of the assembly portion. A check valve.

  According to a third aspect of the present invention, the gas-liquid separating means is formed with a return hole capable of returning the oil component separated from the blow-by gas into the head cover.

  According to a fourth aspect of the present invention, the gas-liquid separation device includes guiding means capable of guiding the oil component separated from the blow-by gas to the return hole.

  According to a fifth aspect of the present invention, the collecting portion has a connection portion to which an intake air amount adjusting means for adjusting an intake air amount is connected, and the gas-liquid separation means is formed in the vicinity of the connection portion.

  According to a sixth aspect of the present invention, the intake manifold has an intake pipe having one end connected to the collecting portion and the other end connected to an intake port, and the gas-liquid separating means is connected to the intake pipe of the collecting portion. It is formed on the formed side.

An internal combustion engine of the present invention includes a gas-liquid separation unit capable of separating oil in blow-by gas, and an intake manifold disposed on an upper surface of a head cover into which blow-by gas separated by the gas-liquid separation unit is introduced. The liquid separating means is integrally formed with the collecting portion of the intake manifold, and is a means for fixing and supporting the collecting portion on the upper surface of the head cover, so that the gas-liquid separating means is formed integrally with the collecting portion of the intake manifold. Since the temperature of the gathering portion is substantially equal to the outside air temperature and is lower than the temperature in the head cover, the temperature of the blow-by gas is likely to be lower than that in which the gas-liquid separation chamber is formed in the head cover. As a result, the gas-liquid separation performance can be improved.
In addition, the gas-liquid separation chamber is used to fix and support the intake manifold assembly on the top surface of the head cover, so there is no need to prepare a separate component to support the assembly on the top surface of the head cover, reducing the number of components. It will be possible.

  The gas-liquid separation means has a first communication part communicating with the inside of the head cover and a second communication part communicating with the inside of the collecting part, and the second communication part is provided with a check valve. Thus, the blow-by gas can be circulated without piping or the like, the number of parts can be reduced, and the check valve is provided, so that the back-flow of blow-by gas can be prevented well.

  In addition, the gas-liquid separation means can return the oil separated from the blowby gas to the inside of the head cover by forming a return hole capable of returning the oil separated from the blowby gas inside the head cover. It becomes.

  In addition, the gas-liquid separation device can guide the oil separated from the blow-by gas to the return hole satisfactorily by having guiding means that can guide the oil separated from the blow-by gas to the return hole.

  The collecting portion has a connecting portion to which an intake air amount adjusting means for adjusting the intake air amount is connected, and the gas-liquid separating means is formed in the vicinity of the connecting portion, so that the collecting by the weight of the intake air amount adjusting means is performed. It is possible to satisfactorily suppress the collapse of the part.

  The intake manifold has an intake pipe having one end connected to the collecting portion and the other end connected to the intake port, and the gas-liquid separation means is formed on the side of the collecting portion where the intake pipe is connected. Thus, vibration of the internal combustion engine can be effectively suppressed.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a perspective configuration diagram of an intake manifold provided on an upper surface of a head cover of an internal combustion engine, FIG. 2 is a plan configuration diagram of FIG. 1, FIG. 3 is a plan view of a head cover, and FIG. FIG. 5 is a cross-sectional configuration diagram along line AA in FIG. 2, and FIG. 5 is a cross-sectional configuration diagram along line BB in FIG. 4.

  In the figure, an internal combustion engine of an embodiment includes a head cover 1 attached to an upper surface of a cylinder head (not shown), a collecting portion 3 for receiving intake air from a throttle chamber (not shown), which is an intake air amount adjusting means connected to a connection portion 5, Four intake pipes 4, 4, 4, 4 for supplying the intake air received by the collecting portion 3 to four intake ports formed in a cylinder head (not shown), and the gas-liquid of blow-by gas generated inside the internal combustion engine An intake manifold 2 including a gas-liquid separation device 6 integrally formed with the collecting portion 3 that performs separation and attaches and fixes the collecting portion 3 to the upper surface of the head cover 1.

  The head cover 1 has a fresh air introduction passage 1a for introducing fresh air from the upstream side of the throttle chamber and supplying it into the cylinder head, and a blow-by gas for discharging the blow-by gas from the cylinder head to the collecting section 3. A discharge passage 1b is formed, and the fresh air introduction passage 1a and the blow-by gas discharge passage 1b are formed to be separated from each other by attaching a baffle plate 8 to the rib 1c of the head cover 1, and also from the inside of the cylinder head. Is formed.

Further, the fresh air introduction passage 1 a and the blow-by gas discharge passage 1 b are communicated with the cylinder head through communication holes 1 d and 1 e formed in the baffle plate 8, and the blow-by gas discharge passage 1 b is formed in the head cover 1. The gas-liquid separator 6 is communicated with the opening 1f.
In the vicinity of the opening 1f, ribs 1g are formed so as to protrude from the ribs 1c in order to allow blow-by gas to flow only from the first communication part 10 in the gas-liquid separator 6 described later.

The gas-liquid separation device 6 has a body portion formed in a box shape having an open lower surface side and is integrally formed on the side where the intake pipe 4 is connected in the vicinity of the connecting portion 5 of the collecting portion 3. In addition, the intake manifold 2 is fixedly supported on the upper surface of the head cover 1 by fixing the flange portion 6a formed on the outer periphery of the lower end of the main body portion to the upper surface of the head cover 1 with bolts 7, 7, 7. It is configured to be able to.
A gas-liquid separation chamber for separating oil in blow-by gas is formed inside the main body of the gas-liquid separator 6.

  By integrally forming the gas-liquid separator 6 in the vicinity of the connection portion 5, it is possible to satisfactorily suppress the collapse of the collective portion 3 due to the heavy throttle chamber, and the gas-liquid separator 6 is connected to the intake pipe of the collective portion 3 4 is formed on the side to which the intake pipe 4 is connected, so that the gas-liquid separation device 6 is formed on the side opposite to the side to which the intake pipe 4 is connected across the collecting portion 3. The rotational moment for rotating the assembly portion 3 with the intake port side attachment portion of the intake pipe 4 as a fulcrum can be suppressed, and the intake manifold 2 is fixedly supported on the upper surface of the head cover 1 by the gas-liquid separator 6. As a result, it is not necessary to separately prepare parts for fixing and supporting the intake manifold 2, and the number of parts can be reduced.

  The gas-liquid separation chamber of the gas-liquid separation device 6 has a first communication part 10 communicating with an opening 1 f formed in the head cover 1 and blow-by gas flowing from the first communication part 10 into an intake passage 3 a in the collecting part 3. A bent blowby gas passage 14 for separating the oil content in the blowby gas in the process, and a second communication portion 12 for supplying the blowby gas from which the oil content has been separated to the intake passage 3a in the collecting portion 3; The PCV valve 13 serves as an orifice that suppresses the reverse flow of blow-by gas and restricts excessive blow-by gas suction when the negative pressure of the collecting portion 3 is too high.

  The bent blow-by gas passage 14 has a partition wall 6c formed so as to protrude from the substantially central portion of the upper wall 6d of the outer peripheral wall 6b constituting the main body of the gas-liquid separator 6 toward the upper surface of the head cover 1. It is composed of a blow-by passage forming plate 9 that forms part of the first communication portion 10 installed from the baffle plate 8 so as to rise up toward the upper surface of the outer peripheral wall 6b, as shown in FIG. The gas-liquid separation chamber is divided into a left chamber partitioned by the outer peripheral wall 6b and the blow-by passage forming plate 9, a middle chamber partitioned by the blow-by passage forming plate 9 and the partition wall 6c, the partition wall 6c and the collecting portion. It is partitioned into three chambers, the right chamber partitioned by the outer peripheral wall 6b on the 3 side.

The left chamber and the middle chamber communicate with each other through a gap 9a formed between the upper end of the blow-by passage forming plate 9 and the upper wall 6d, and the middle chamber and the right chamber are formed in an upper portion of the partition wall 6c. The right ventricle is communicated through a PCV valve 13 attached to a second communication portion 12 formed at substantially the same height as the communication hole 11 in the outer peripheral wall 6b on the collecting portion 3 side. It is in communication with the intake passage 3 a in the collecting portion 3.
The communication hole 11 and the second communication part 12 are formed by drilling a hole in the left outer peripheral wall 6b in FIG. 4 and drilling or the like from this hole. The hole on the outer peripheral wall 6b side is later blind plugged. The lid can be covered with 6e.

In addition, a guide portion 1h is formed on the upper surface portion of the head cover 1 that separates the inner chamber from the inside of the head cover 1 in a downwardly inclined manner from the outer peripheral wall 6b on the collecting portion 3 side to the partition wall 6c. A return hole 16 is formed between the partition wall 6c and the partition wall 6c.
Further, a hole 8a is formed at the base of the blow-by passage forming plate 9, and a hole 8b is formed in the baffle plate 8 positioned on the lower side of the left ventricle. The opening area of the holes 8a and 8b is the communication hole 11 and the gap. It is formed sufficiently smaller than the opening area of 9a. In addition, the front-end | tip of the induction | guidance | derivation part 1h is formed in the upper position of the hole 8a.

Next, the operation of the gas-liquid separator in the internal combustion engine of the embodiment configured as described above will be described.
The blow-by gas introduced into the left chamber from the blow-by gas discharge path 1b in the head cover 1 via the first communication portion 10 rises in the left chamber and flows into the middle chamber from the gap 9a. The blow-by gas that has flowed into the middle chamber flows into the right chamber through the communication hole 11, and is supplied to the intake passage 3 a in the collecting portion 3 through the PCV valve 13. At this time, the oil content in the blow-by gas is well separated while the blow-by gas is guided to the PCV valve 13 while colliding with the upper wall 6d, the blow-by passage forming plate 9 and the partition wall 6c.
The separated oil is satisfactorily returned to the inside of the cylinder head through the path from the middle chamber through the holes 8a and 8b, the path from the right chamber through the return holes 16 through the holes 8a and 8b, and both paths.

Here, in the embodiment, the gas-liquid separator 6 is integrally formed in the gathering portion 3 that is substantially equal to the outside air temperature, and is therefore relatively high temperature (several hundred degrees) because it communicates with the combustion chamber of the cylinder head. The temperature in the gas-liquid separation chamber can be made lower than that in which the gas-liquid separation device 6 is formed inside the head cover 1. As a result, the temperature of the blow-by gas can be easily lowered, and the gas-liquid separation performance is further improved. In addition, since the blow-by gas can be recirculated without using piping or the like, the number of parts can be reduced. Further, a guiding portion 1h is formed on the upper surface portion of the head cover 1 that separates the inside chamber from the inside of the head cover 1, and the leading end of the guiding portion 1h is positioned almost above the hole 8a, so that the separated oil is returned. It can guide | invade to the hole 16 and can be favorably returned to the inside of a cylinder head from hole 8a, 8b.
Since the opening areas of the holes 8a and 8b are sufficiently smaller than the opening areas of the communication hole 11 and the gap 9a, most of the flow of blow-by gas flows through the gap 9a and the communication hole 11 from the left chamber. The path of the PCV valve 13 is followed.

According to the internal combustion engine of the embodiment described above, since the gas-liquid separation device 6 is integrally formed with the collecting portion 3 of the intake manifold 2, the temperature in the gas-liquid separation chamber can be lowered, and the temperature of the blow-by gas can be reduced. It can be easy to fall. As a result, gas-liquid separation performance can be improved.
Further, since the intake manifold 2 is fixedly supported on the upper surface of the head cover 1 by the gas-liquid separation device 6, it is not necessary to separately use parts for fixing and supporting the intake manifold 2, and the number of parts can be reduced. Further, since the blow-by gas can be recirculated from the blow-by gas discharge passage in the head cover 1 to the intake air passage 3a in the collecting portion 3 through the gas-liquid separator 6 without using piping or the like, the number of parts is reduced. be able to.

  In the internal combustion engine of the embodiment, the gas-liquid separation chamber is formed only in the gas-liquid separation device 6, but the gas-liquid separation chamber may also be formed in the head cover 1. In this case, the gas-liquid separation chamber may be formed by forming the blow-by gas discharge path in a bent shape.

  In the internal combustion engine of the embodiment, the gas-liquid separation device 6 is integrally formed on the side of the collecting portion 3 to which the intake pipe 4 is connected, but what is the side of the collecting portion 3 to which the intake pipe 4 is connected? It may be formed integrally on the opposite side.

  As mentioned above, although embodiment of this invention was described using the Example, this invention is not limited to such an Example, In the range which does not deviate from the summary of this invention, it can implement with a various form. Of course.

FIG. 4 is a perspective configuration diagram of an intake manifold fixed on a head cover. It is a plane block diagram of FIG. It is a top view of a head cover. It is the sectional view on the AA line of FIG. FIG. 4 is a cross-sectional configuration diagram along line BB in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head cover 1a New introduction passage 1b Blow-by gas discharge passage 1c, 1g Rib 1d, 1e Communication hole 1f Opening 1h Guide part 2 Intake manifold 3 Collecting part 3a Intake passage 4 Intake pipe 5 Connection part 6 Gas-liquid separation means 6a Flange part 6b Outer periphery Wall 6c Partition wall 6d Upper wall 7 Bolt 8 Baffle plate 8a, 8b Hole 9 Blow-by passage forming plate 9a Clearance 10 First communication portion 11 Communication hole 12 Second communication portion 13 PCV valve 14 Blow-by gas passage 15 Oil passage

Claims (6)

In an internal combustion engine comprising: a gas-liquid separation unit capable of separating oil in blow-by gas; and an intake manifold disposed on an upper surface of a head cover into which the blow-by gas separated by the gas-liquid separation unit is introduced.
The gas-liquid separation means is an internal combustion engine that is integrally formed with a collecting portion of the intake manifold and is a means for fixing and supporting the collecting portion on the upper surface of the head cover.   The gas-liquid separation means has a first communication portion communicating with the interior of the head cover and a second communication portion communicating with the interior of the collecting portion, and the second communication portion includes a check valve. The internal combustion engine according to claim 1.   The internal combustion engine according to claim 2, wherein the gas-liquid separation means is formed with a return hole capable of returning the oil component separated from the blow-by gas into the head cover.   4. The internal combustion engine according to claim 3, wherein the gas-liquid separation device includes a guiding unit capable of guiding oil separated from the blow-by gas to the return hole. The collective portion has a connection portion to which intake air amount adjusting means for adjusting the intake air amount is connected,
The internal combustion engine according to any one of claims 1 to 4, wherein the gas-liquid separation means is formed in the vicinity of the connecting portion. The intake manifold has an intake pipe having one end connected to the collecting portion and the other end connected to an intake port;
The internal combustion engine according to any one of claims 1 to 5, wherein the gas-liquid separation means is formed on a side of the collecting portion to which the intake pipe is connected.

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