JP2532890Y2 - Gas-liquid separator for blow-by gas - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid separation apparatus for extracting blow-by gas from a cylinder head cover in an internal combustion engine into an intake system.

[0002]

2. Description of the Related Art When a blow-by gas in a cylinder head cover of an internal combustion engine is extracted into an intake system, a gas-liquid separator for separating oil in the blow-by gas is provided integrally with the cylinder head cover. No. 59-43613 and Japanese Utility Model Application Laid-Open No. 62-1.
No. 22108, and the like.

As described above, in the conventional gas-liquid separation device integrally provided on the cylinder head cover, a side frame wall is integrally formed on the lower surface of the ceiling plate of the cylinder head cover, and the side frame wall is formed. A bottom plate is joined to the lower surface so as to close the inside of the side frame wall, and the inside thereof is formed as a volume-type gas-liquid separation chamber. The bottom plate has a blow-by gas inlet opening into a cylinder head cover. Each of the side frame walls is provided with a blow-by gas outlet that opens into the gas-liquid separation chamber, so that oil in the blow-by gas is separated in the positive displacement gas-liquid separation chamber.

[0004] In this kind of gas-liquid separation device,
In order to improve the oil separation efficiency, the internal volume of the gas-liquid separation chamber should be as large as possible, but in order to increase the internal volume of the gas-liquid separation chamber, Since increasing the height of the internal combustion engine increases the total height of the internal combustion engine, conventionally, the height of the gas-liquid separation chamber is reduced to increase the lateral dimension, thereby increasing the internal volume. ing.

[0005] In addition, in the conventional gas-liquid separation device, the blow-by gas inlet is provided at a position as far as possible from the blow-by gas outlet to improve the oil separation efficiency. .

[0006]

However, in this type of gas-liquid separation device, the oil separated in the gas-liquid separation chamber accumulates on the upper surface of the bottom plate, and then flows through the blow-by gas inlet formed in the bottom plate. Since it has a form of flowing out into the cylinder head cover, in addition to increasing the lateral dimension of the gas-liquid separation chamber, it is preferable to provide a blow-by gas inlet at a position as far as possible from the blow-by gas outlet. According to this configuration, not only the oil separated from the blow-by gas accumulates in a portion of the upper surface of the bottom plate near the blow-by gas outlet, but also a large amount of oil accumulates when the entire internal combustion engine is inclined. Since this oil is extracted into the intake system together with the blow-by gas, the consumption of oil increases, Deterioration of the gas-gas, and there has been a problem to say that to lead to contamination and the like of the filter element.

An object of the present invention is to solve this problem without causing a complicated structure and an increase in the number of parts.

[0008]

According to the present invention, a bottom plate having a blow-by gas inlet is joined to a lower surface of a side frame wall formed downward from a ceiling plate of a cylinder head cover. A gas-liquid separation device, wherein the interior of the gas-liquid separation chamber is formed as a positive displacement gas-liquid separation chamber, and a blow-by gas outlet opening into the gas-liquid separation chamber is provided on the ceiling plate or the side frame wall. Inlet and blower
-The gas outlet is swung to the left and right sides of the gas-liquid separation chamber.
While disposed separately, the portion adjacent to the blow-by gas outlet of the peripheral portion of the bottom plate, bent to partially downward away from the lower surface of the side frame walls, that
A narrow gap is formed between the lubricating oils to flow out . ".

[0009]

[Action and effects of the invention] In this way, parts of the gas-liquid separation chamber
Low-by gas inlet and blow-by gas from gas-liquid separation chamber
Outlets on the left and right sides of the gas-liquid separation chamber.
On the other hand, the blow
The part adjacent to the bigas outlet, from the lower surface of the side frame wall
Partially bent downwards away, lubricating between them
By forming a narrow gap for oil spill, blow-by
Blow-by gas flowing into the gas-liquid separation chamber from the gas inlet
Is to ensure that oil is separated in the gas-liquid separation chamber.
The oil separated in the gas-liquid separation chamber and accumulated on the upper surface of the bottom plate, and the oil flowing into the gas-liquid separation chamber from the blow-by gas inlet due to the inclination of the internal combustion engine are defined as the blow-by gas inlet. A large amount of oil accumulates in the vicinity of the blow-by gas outlet from the gas-liquid separation chamber because it will sequentially flow out of the gas-liquid separation chamber from the gap at the bent portion located on the opposite side. On the other hand, since the gap in the bent portion is closed by the oil flowing out of the gap, the blow-by gas in the cylinder head cover is prevented from blowing up from the gap into the gas-liquid separation chamber. You can.

Therefore, according to the present invention, blow-by gas
It is securely separated in the oil gas-liquid separation chamber during
On the other hand, it is possible to greatly reduce the oil flowing out together with the blow-by gas from the blow-by gas outlet in the gas-liquid separation chamber, and furthermore, in the present invention, a part of the bottom plate forming the gas-liquid separation chamber is removed. Since it is only necessary to bend, there is an effect that the number of parts is increased, the structure is complicated, and the production cost is not increased.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the figure, reference numeral 1 indicates a cylinder head, and reference numeral 2
Indicates a cylinder head cover that covers the valve mechanism 3 on the upper surface of the cylinder head 1. The cylinder head cover 2 is detachably fastened to the upper surface of the cylinder head 1 by bolts or the like (not shown).

On the lower surface of the ceiling plate 4 of the cylinder head cover 2, a side frame wall 5 is integrally formed downward so that the lower surface 5a of the side frame wall 5 covers the inside of the side frame wall 5. The bottom plate 6 in the form of a flat plate is joined by screws or the like, and the inside thereof is formed in a volume-type gas-liquid separation chamber 7.
The ceiling plate 4 in the cylinder head cover 2 has a front
A blow-by gas outlet pipe 8 is provided from one of the left and right sides of the gas- liquid separation chamber 7 , and this blow-by gas outlet pipe 8 is connected to an intake system such as an air cleaner or an intake manifold (neither is shown). I do.

On the other hand, the bottom plate 6 is provided at a position distant from the blow-by gas outlet pipe 8 , that is, at the gas-liquid separation chamber 7.
Of the left and right sides opposite to the blow-by gas outlet pipe 8
The site of, bored by gas inlet 9 to the gas-liquid separation chamber 7. In the peripheral portion of the bottom plate 6 adjacent to the blow-by gas outlet pipe 8, there are provided a plurality of bent portions 10 which are partially bent obliquely downward away from the lower surface 5 a of the side frame wall 5. Place
Between, that form a narrow gap 11 of lubricating oil spill.

In this configuration, the blow-by gas in the cylinder head cover 2 is supplied to the blow-by gas inlet 9.
The gas further flows into the gas-liquid separation chamber 7, and after the oil is separated in the gas-liquid separation chamber 7, the oil is extracted from the blow-by gas outlet pipe 8 into the intake system. The oil separated in the gas-liquid separation chamber 7 and accumulated on the upper surface of the bottom plate, and the gas-liquid separation chamber 7
The oil that has flowed into the inside flows out of the gas-liquid separation chamber 7 sequentially through the gap 11 between the bent portion 10 and the lower surface 5a of the side frame wall 5, so that the blow-by gas from the gas-liquid separation chamber 7 While a large amount of oil can be reliably prevented from accumulating in the vicinity of the outlet pipe 8, the gaps 11 in the bent portions 10 are closed by the oil flowing out from the gaps 11. This prevents blow-by gas from blowing up into the gas-liquid separation chamber 7 from the gap 11.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention.

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

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cylinder head 2 cylinder head cover 3 valve operating mechanism 4 ceiling plate 5 side frame wall 6 bottom plate 7 gas-liquid separation chamber 8 blow-by gas outlet pipe 9 blow-by gas inlet 10 bent portion 11 gap

Claims (1)

(57) [Scope of request for utility model registration] 1. A bottom plate provided with a blow-by gas inlet is joined to a lower surface of a side frame wall formed downward from a ceiling plate of a cylinder head cover, and the inside thereof is formed as a volume-type gas-liquid separation chamber. In a gas-liquid separation device provided with a blow-by gas outlet opening into the gas-liquid separation chamber on a ceiling plate or the side frame wall, the blow-by gas inlet and the blow-by gas
Distribute the gas outlet to the left and right sides of the gas-liquid separation chamber
On the other hand, a portion of the peripheral portion of the bottom plate adjacent to the blow-by gas outlet is partially bent downward so as to be away from the lower surface of the side frame wall, and moisture is interposed therebetween.
A gas-liquid separation device for blow-by gas, wherein a narrow gap for lubricating oil outflow is formed .