JP2839125B2 - Blow-by gas recirculation system for water-cooled internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a blow-by gas recirculation apparatus for recirculating blow-by gas generated in an internal combustion engine.

[0002]

2. Description of the Related Art Generally, in an internal combustion engine of an automobile or the like, there is a so-called blow-by gas in which a part of combustion gas in a combustion chamber leaks from a space between a piston and a cylinder to a crankcase side. This blow-by gas contains harmful hydrocarbons (HC)
And cannot be released directly to the atmosphere. Therefore, conventionally, a blow-by gas recirculation device that recirculates blow-by gas to a combustion chamber through an intake system has been proposed. This is because, as shown in the conceptual diagram of FIG. 7, the blow-by gas 52 leaking to the side of the crank chamber 51 is supplied to a combustion chamber 55 via a breather hose 53 and an air cleaner 54, where it is reburned. .

[0003]

By the way, the blow-by gas contains oil mist and water, and when this is recirculated, the oil mist adheres to the intake system and fuel system components and causes a malfunction. Becomes In addition, the water becomes condensed water, which becomes a factor that makes the lubricating oil cloudy and deteriorates. However, it is difficult for the above-described conventional blow-by gas recirculation device to sufficiently remove such factors.

Accordingly, an object of the present invention is to efficiently separate oil mist without condensing water contained in blow-by gas.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a blow-by gas is introduced from a crankcase into a blow-by gas recirculation device, and a part of oil mist contained in the blow-by gas is separated. A first chamber;
From this first chamber by introducing blow-by gas, a second chamber for separating the remainder of the oil mist contained in the blow-by gas is provided, the first chamber, the internal combustion engine
Above the cylinder head as the cylinder head cover
And a second chamber is provided with a water jacket.
Near the outlet of the cooling water passage in the cylinder head
The cylinder head is formed integrally with the water temperature valve
Characterized in that it is attached to the side of the.

[0006]

The first chamber introduces blow-by gas from the crank chamber and separates a part of the oil mist contained in the blow-by gas. The second chamber introduces a blow-by gas from the first chamber and separates the remaining oil mist contained in the blow-by gas. Also,
The first chamber, which also serves as the Linda head cover, has a cylinder
Since the top of the head was covered, the inside of the first chamber was
Conduction from cylinder head heated by combustion heat
As a result, the temperature rises. The combustion in the combustion chamber also occurs in the second chamber.
Cylinder head heated by heat and water jar
Heat conduction with cooling water heated by the
You. For this reason, the first chamber and the second chamber do not condense the water contained in the blow-by gas and prevent the condensed water from being mixed into the separated and recovered oil.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is a conceptual diagram of an embodiment of a blow-by gas recirculation device for a water-cooled internal combustion engine according to the present invention. The blow-by gas recirculation device 1 sucks blow-by gas G leaked from the combustion chamber 3 of the water-cooled internal combustion engine 2 to the crank chamber 6 through a gap between the piston 4 and the cylinder 5 by using an air cleaner 7 and an intake manifold 8. This is a system that recirculates to the system 9 and reburns it.

The water-cooled internal combustion engine 2 includes a first chamber 2 also serving as a cylinder block 11, a cylinder head 12, and a cylinder head cover each having a water jacket.
0 is connected. An oil pan 14 for storing lubricating oil is mounted below the cylinder block 11. The blow-by gas recirculation device 1 introduces the blow-by gas G from the crank chamber 6 and
A first chamber (cylinder head cover) 20 for separating a part of the oil mist contained in the blow-by gas G is introduced from the first chamber 20 to separate the remaining oil mist contained in the blow-by gas G. And a second chamber 30. The oil mist separated in the first chamber 20 and the second chamber 30 is
Collected in 4.

The second chamber 30 includes the cylinder head 12
In the vicinity of the water jacket 15, the cooling water passage 16 is formed integrally with a water temperature valve 17 attached to an outlet of the cooling water passage 16. The cooling water passage 16 includes a radiator 18
And a water pump 19 connected to a cooling water inlet of each water jacket (not shown) of the water-cooled internal combustion engine 2.

FIG. 2 is a side view of a water-cooled internal combustion engine according to the present invention. The upper portion of the cylinder head 12 is covered with a first chamber 20, and a second chamber 30 is mounted on the left side surface in FIG.

FIG. 3 is a plan view of a water-cooled internal combustion engine according to the present invention. The gas outlet pipe 21 of the first chamber 20 is
The connection hose 40 is connected to the gas inlet pipe 31 of the chamber 30.

FIG. 4 is an enlarged sectional view of an essential part taken along line 4-4 in FIG. The first chamber 20 has a main body 22 that is open at the bottom and is formed in a substantially arm shape.
The lower surface facing 2 is closed by a closing plate 23 to form a space 24 inside the chamber. The closing plate 23 is provided with a gas inlet hole 23a for communicating the crank chamber 6 (see FIG. 1) with the chamber interior space 24, and the gas inlet hole 23a is provided with the blow-by gas G on the crank chamber 6 side.
Is provided with a reed valve 25 which opens and closes by the gas pressure.

A gas outlet pipe 21 is provided in the chamber space 24.
The inner baffle 22a and the outer baffle 22b are double-hanged from the upper wall of the main body 22 to the periphery of the inner end 21a. Inner baffle 22
The lower part of the inner passage 26 surrounded by a.
It is closed by an auxiliary baffle 27 on the third side. Outer passage 2 surrounded by inner baffle 22a and outer baffle 22b
8 communicates between the chamber interior space 24 and the inner passage 26.

FIG. 5 is an enlarged side view of an essential part in which a part of line 5-5 in FIG. 2 is sectioned. The second chamber 30 includes a water jacket 15 of the cylinder head 12, a cooling water passage 16 of the water jacket 15, a water temperature valve 17 attached to an outlet of the cooling water passage 16, and a water jacket 1.
5 and is integrally formed with a chamber space 32 provided near the cylinder head 5, and is fixed to a side surface of the cylinder head 12 by bolts.

The chamber space 32 is divided by a baffle 33 and communicates with a lower passage 34 and an upper passage 3 which are communicated with each other.
5 and an oil reservoir 36 is provided below the lower passage 34. A gas inlet pipe 31 is attached to the lower passage 34 with its inner end protruding, and a gas outlet pipe 37 is attached to the upper passage 35 with its inner end protruding. The gas outlet pipe 37 is connected to the intake system 9 (see FIG. 1), and the chamber space 32 is provided with an oil discharge portion 38 that receives the oil overflowing from the oil reservoir 36 and returns the oil to the oil pan 14 (see FIG. 1). It is formed integrally.

FIG. 6 is an external view of the second chamber according to the present invention. The water temperature valve 17 opens and closes the passage according to the water temperature in the cooling water passage 16. For example, the water temperature valve 17 a opens and closes by the expansion and contraction of the wax sealed in the temperature sensing portion. This is a configuration mounted between the case 17b and the lid 17c. The case portion 17b is formed integrally with the cooling water passage 16, and the lid portion 17c is detachably attached. A radiator 18 is provided on the lid 17c.
A cooling water outlet pipe 17d toward (see FIG. 1) is formed integrally.

The operation of the blow-by gas recirculation system for a water-cooled internal combustion engine having the above configuration will be described below. As shown in FIG. 1, the blow-by gas G leaked from the combustion chamber 3 to the crank chamber 6 through the gap between the piston 4 and the cylinder 5
The gas enters the chamber space 24 of the first chamber 20 through the gas inlet hole 23a. During the passage of the blow-by gas G from the chamber interior space 24 to the outer passage 28 and the inner passage 26, the blow-by gas G collides with the baffles 22a, 22b, 27, etc., and drops due to gravity. It is separated and enters the second chamber 30 through the gas inlet pipe 31 from the gas outlet pipe 21 via the connection hose 40.

While the blow-by gas G passes through the lower passage 34 and the upper passage 35 of the second chamber 30, the remaining oil mist contained therein is separated by collision with the baffle 33 and the like and gravity drop, The gas is recirculated from the gas outlet pipe 37 to the intake system 9 and recombusted in the combustion chamber 3. The oil mist separated from the blow-by gas G in the first chamber 20 and the second chamber 30 is collected in the oil pan 14.

Next, the operation of the second chamber 30 will be described. As shown in FIG. 5, the oil mist contained in the blow-by gas G is separated in the lower passage 34 and the upper passage 35 and is temporarily stored in the oil reservoir 36 as separated oil. The separated oil overflows from the oil sump 36, and flows through the oil discharge unit 38 to the oil pan 14 (see FIG. 1).
And used as lubricating oil in the crankcase 6.

Incidentally, as shown in FIG. 1, the in-chamber space 24 of the first chamber 20 is in a high temperature state due to the combustion heat of the combustion chamber 3. Further, the inside of the chamber space 32 of the second chamber 30 is in a high temperature state due to heat conduction between the cylinder head 12 heated by the combustion heat of the combustion chamber 3 and the cooling water heated by the water jacket 15. The chamber space 24 and the chamber space 32 are
They are arranged at positions close to each other, communicate with each other by a connection hose 40, and are kept at a relatively high temperature. Therefore, the moisture contained in the blow-by gas G passing through the chamber spaces 24 and 32 is not condensed. Therefore, the moisture contained in the blow-by gas G does not mix into the separated oil separated in the chamber spaces 24 and 32.

In the above embodiment, the first chamber 2
0 is not limited to the configuration also serving as the cylinder head cover, but may be any configuration provided on the cylinder head cover of the water-cooled internal combustion engine 2.

[0022]

As described above, the present invention provides a crankcase.
Introduce blow-by gas from
First chamber for separating a part of the contained oil mist
But also serves as the cylinder head cover,
Cover to effectively utilize the heat of combustion in the combustion chamber.
Temperature inside the first chamber
Become. Also, blow-by gas is introduced from the first chamber.
The residual oil mist contained in the blow-by gas
The second chamber separating the parts is
Near the outlet of the cooling water passage of the cylinder head
Formed integrally with the water temperature valve, the side of the cylinder head
By mounting it in a chamber heated by the combustion heat of the combustion chamber
Linda head and cold heated by water jacket
Since the heat conduction with the water can be effectively used,
The inside of the two chambers becomes hot. Thus, the first
The chamber and the second chamber are warmed, and the blow-by gas is warmed therein, so that only the oil mist can be efficiently separated without condensing the moisture contained in the blow-by gas. That is, the cylinder head
High heat transmitted from the top and sides and cooling of the cylinder head
Heat near the water temperature valve attached to the outlet of the water passage
Utilizes the high heat transmitted from the cooling water
To prevent the condensation of water contained in Igus, effectively
In addition, gas-liquid separation of blow-by gas and oil mist,
It can be performed efficiently.

In addition, since the second chamber is formed integrally with the water temperature valve provided at the outlet of the cooling water passage of the cylinder head, the two are integrated into one body, thereby reducing the size and the number of parts. At the same time, attachment to the cylinder head is simplified.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an embodiment of a blow-by gas recirculation device for a water-cooled internal combustion engine according to the present invention.

FIG. 2 is a side view of the water-cooled internal combustion engine according to the present invention.

FIG. 3 is a plan view of a water-cooled internal combustion engine according to the present invention.

FIG. 4 is an enlarged sectional view of a main part taken along line 4-4 in FIG. 2;

FIG. 5 is an enlarged side view of an essential part in which a part of a line 5-5 in FIG. 2 is cross-sectioned;

FIG. 6 is an external view of a second chamber according to the present invention.

FIG. 7 is a conceptual diagram of a conventional blow-by gas recirculation device for an internal combustion engine.

[Explanation of symbols]

1 ... Blow-by gas recirculation device, 2 ... Water-cooled internal combustion engine, 3
... combustion chamber, 4 ... piston, 5 ... cylinder, 6 ... crank chamber, 9 ... intake system, 12 ... cylinder head, 15 ... water jacket, 16 ... cooling water passage, 17 water temperature valve, 2
0: first chamber (cylinder head cover), 30: second chamber, 40: connecting hose.

Claims (1)

(57) [Claims] 1. A blow-by gas recirculation device for recirculating blow-by gas leaked into a crank chamber through a gap between a piston and a cylinder into a suction system in a water-cooled internal combustion engine and recombusting the blow-by gas. A first chamber for introducing a blow-by gas from a crank chamber and separating a part of an oil mist contained in the blow-by gas, and a blow-by gas introduced from the first chamber to contain the blow-by gas. And a second chamber for separating the remainder of the oil mist, wherein the first chamber also serves as a cylinder head cover of the internal combustion engine.
Covering the upper part of Daheddo, also, the second chamber, in the vicinity of the c <br/> O terpolymer jacket, the cylinder head cooling water
It is formed integrally with the water temperature valve attached to the exit of the passage.
A blow-by gas recirculation device for a water-cooled internal combustion engine, which is attached to a side portion of a cylinder head .