JPH0441210Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an oil separator for separating gas and liquid from engine blow-by gas, and particularly relates to an improvement of an oil separator provided at the upper part of a cylinder head cover.

(Prior Art) Conventionally, this type of oil separator has been developed by disposing a buff-full plate in the cylinder head cover to fill the cylinder head cover space, as disclosed in, for example, Japanese Utility Model Application Publication No. 59-110317. It is known that an oil separator chamber is divided into sections and a meandering flow path is formed in the oil separator chamber by arranging a partition wall in the oil separator chamber. The oil separator introduces blow-by gas that leaks inside the crankcase and is guided into the cylinder head cover through a communication passage or the like due to the pressure inside the crank case into the meandering flow passage of the oil separator chamber, thereby discharging the blow-by gas. When the blow-by gas meanderes, the engine oil contained in the blow-by gas is deposited as droplets on the wall of the meandering flow path due to its inertia, and this engine oil is collected in the oil pan, and the blow-by gas from which the engine oil is separated is is supplied to the engine's intake passage, etc.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional engine, since various valve train parts are arranged inside the cylinder head cover, the engine oil is absorbed by these valve train parts. It may be thrown up and float, and some of it may be drawn into the flow of blow-by gas and flow into the oil separator chamber. As a result, engine oil that cannot be separated in the oil separator chamber is sucked into the combustion chamber through the intake passage along with blow-by gas and burned, resulting in increased engine oil consumption and poor emission performance. .

The present invention has been made in view of the above, and an object thereof is to provide an oil separator that can improve droplet formation of oil mist in blow-by gas.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a chamber on the upstream side of the oil separator chamber to expand the blow-by gas and reduce its flow velocity.
As a result, the oil mist in the blow-by gas is turned into droplets, and the engine oil which has turned into droplets in the chamber is caused to drip from the blow-by gas inlet to the cylinder head side by its own weight.

Specifically, the solution taken by the present invention is that the oil separator of the engine is connected to a buff-full plate provided below the upper wall of the cylinder head cover with a space between the cylinder head cover and the cylinder head cover. The upper space is formed by an upper space extending in the cylinder row direction formed by the upper wall and the side wall, and a buff-full plate holding wall that hangs down from the side of the upper wall of the cylinder head cover and holds the buff-full plate. A separator chamber on the central side and a chamber on the side which are divided into sections, a side end of the buffful plate extending toward the chamber side from the buffful plate retaining wall, and a side wall of the cylinder head cover. A narrowed suction port is formed at the lower part of the chamber and extends over substantially the entire area in the cylinder row direction for sucking blow-by gas into the chamber, and the buttful plate retaining wall is partially opened. The structure includes a communication port for introducing the blow-by gas formed and sucked into the chamber into the separator chamber.

(Function) With the above configuration, a chamber can be formed by the top wall and side wall of the cylinder head cover, the buffle plate, and the buffle plate holding wall.

A narrowed suction port is formed at the bottom of the chamber by the side end of the buttful plate and the side wall of the cylinder head cover, and is used to suck blow-by gas into the chamber. The sucked blow-by gas expands within the chamber and the flow rate decreases, so the oil mist in the blow-by gas is efficiently turned into droplets within the chamber. In this case, the suction port is narrowed but extends over almost the entire area in the direction of the cylinder row, so the opening area of the suction port is secured, which prevents blow-by gas from flowing into the chamber. Must not be.

Furthermore, since the intake port is constricted, floating engine oil is prevented from flowing into the chamber.

In addition, since it is equipped with a communication port formed by partially opening the buttful plate holding wall, there is an inlet for inhaling blow-by gas into the chamber and a communication port for introducing blow-by gas into the separator chamber. Since a certain distance can be secured between the blow-by gas and the blow-by gas, the oil mist in the blow-by gas is turned into droplets while the blow-by gas is sucked into the chamber from the suction port and reaches the communication port.

Further, since the suction port is provided at the bottom of the chamber, engine oil that has become droplets inside the chamber falls from the suction port toward the cylinder cover due to its own weight.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 4 show a box-shaped cylinder head cover A equipped with an oil separator for an engine according to an embodiment of the present invention. In Figures 1 to 4,
The cylinder head cover A is arranged on the cylinder head (not shown) so as to cover valve train components such as the camshaft S, and the inner space B contains leakage in the crankcase below the space B. The blow-by gas generated is guided by the pressure inside the crankcase.

The cylinder head cover A has two oil separator chambers 1a and 1 extending in the cylinder row direction.
b are provided in series. Each oil separator chamber 1a, 1b is connected to the cylinder head cover by a bulge 3 formed on the upper wall 2 of the cylinder head cover A and buffle plates 4a, 4b disposed below the bulge 3. An upper space is formed above space B. Each oil separator chamber 1a, 1b has a meandering flow path formed by many partition walls (not shown), which causes the blow-by gas to meander and separates the blow-by gas into gas and liquid by the action of inertia. I try to do it.

Furthermore, the upper wall 2 of the cylinder head cover A
Blow-by gas outlets 5a, 5b are provided corresponding to the oil separator chambers 1a, 1b, and the outlets 5a, 5b communicate with the intake passage (not shown) of the engine, and the oil The blow-by gas in the separator chambers 1a and 1b is introduced into the combustion chamber from the intake passage and is subjected to combustion treatment.

Further, on the longitudinal sides of both the oil separator chambers 1a, 1b, there is a buffle plate holding wall 6 that hangs down from the side of the upper wall 2 and holds the sides of the buffle plates 4a, 4b, and a cylinder head cover A. A chamber 7 extending in the longitudinal direction is formed by the upper wall 2 of the cylinder head, the side wall 2a of the cylinder head cover A, and the baffle plates 4a and 4b.

The lower part of the chamber 7 is provided with the buff-full plate 4 over substantially the entire length thereof.
The side wall 2 diagonally above the side edges of a and 4b
bend the lower part of chamber 7 outward.
A narrow suction port 8 with a predetermined clearance x is formed which communicates the cylinder head cover space B with the cylinder head cover space B. In addition, each of the oil separator chambers 1a, 1
The lower part of the buff-full plate retaining wall 6 between the oil separator chambers 1a and 1b and the chamber 7 is partially cut away, and a communication port 9 that communicates the oil separator chambers 1a, 1b and the chamber 7 is partially formed.

Therefore, in the above embodiment, the intake port 8 that communicates the chamber 7 and the cylinder head cover space B is narrowed, so that the engine oil is not absorbed by the valve train members such as the camshaft S. Even if it jumps up and floats, a part of it will become the fourth
It is less likely that the gas will be drawn into the blow-by gas flow shown by the solid line in the figure and flow into the chamber 7 from the suction port 8. Moreover, since the suction port 8 is formed over almost the entire length of the chamber 7, even though the suction port 8 is narrowed, a wide opening area of the suction port 7 can be ensured to ensure smooth flow of blow-by gas. It is possible to ensure a good flow.

Further, the blow-by gas introduced from the suction port 8 is once expanded in the chamber 7 to reduce its flow velocity, and the engine oil contained in the blow-by gas is precipitated as droplets due to its inertia and separated. , is introduced into each oil separator chamber 1a, 1b through the communication port 9, and is further separated into gas and liquid in each oil separator chamber 1a, 1b.
The gas-liquid separation ability of blow-by gas is enhanced. As a result, only the blowby gas containing almost no engine oil is supplied to the intake passage from the blowby gas outlets 5a and 5b. Therefore, blow-by gas can be efficiently combusted while reducing engine oil consumption and improving emission properties.

(Effect of the invention) As explained above, according to the engine oil separator according to the invention, a chamber is formed by the upper wall and side wall of the cylinder head cover, the buttful plate, and the buttful plate retaining wall. Therefore, the chamber can be formed without increasing the weight of the cylinder head cover, and the chamber can be provided compactly.

In addition, since a constricted suction port is provided at the bottom of the chamber for sucking blow-by gas into the chamber, the blow-by gas sucked into the chamber from the suction port expands within the chamber and the flow rate decreases. The oil mist in the gas is efficiently turned into droplets within the chamber, and
The constricted intake prevents floating engine oil from flowing into the chamber.

In addition, a communication port formed by partially opening the buttful plate retaining wall is provided, so that the suction port for sucking blow-by gas into the chamber and the communication port for introducing blow-by gas into the separator chamber are connected. Since a certain distance can be secured between them, the oil mist in the blow-by gas is promoted to droplets while the blow-by gas is sucked into the chamber from the suction port and reaches the communication port, and the gas and liquid are separated. Separation ability is further enhanced.

Furthermore, since the suction port is provided at the bottom of the chamber, the engine oil that has turned into droplets inside the chamber will fall from the suction port to the cylinder cover side due to its own weight, allowing the engine oil that has turned into droplets inside the chamber to be discharged. There is no need to provide holes.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of the cylinder head cover, FIG. 2 is a bottom view of the cylinder head cover, and FIG.
FIG. 4 is an enlarged view of the main part of FIG. 3. A...Cylinder head cover, B...Space, 1
a, 1b...oil separator chamber, 2...upper wall,
2a... side wall, 6... full plate holding wall,
7...Chamber, 8...Intake port, 9...Communication port.

Claims (1)

[Claims for Utility Model Registration] A baffle plate is formed by the upper wall and side walls of the cylinder head cover, and a baffle plate provided below the upper wall of the cylinder head cover with a space between the upper wall and the upper wall. a central separator formed by partitioning the upper space by an upper space extending in the direction of the cylinder rows; and a buttful plate retaining wall hanging from a side of the upper wall of the cylinder head cover and holding the buttful plate; a chamber and a side chamber, a side end of the buffful plate extending toward the chamber side from the buffful plate retaining wall, and a side wall of the cylinder head cover, forming a lower part of the chamber; , a narrowed suction port for sucking blow-by gas into the chamber, which extends over almost the entire area in the cylinder row direction, and a narrowed suction port for sucking the blow-by gas into the chamber; An oil separator for an engine, comprising a communication port for introducing blow-by gas into the separator chamber.