JPH0113778Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an oil separator device formed within a cylinder head cover of an engine and used to separate oil in blow-by gas.

(Prior art) A structure in which an oil separator cover is attached to the lower surface of the labyrinth-forming rib wall of the cylinder head cover to form an oil separator chamber was developed in U.S. Pat.
As an example is shown in the publication, it belongs to well-known matter.

(Problem that the invention aims to solve) By the way, the cylinder head cover is divided into left and right parts, making it impossible to increase the volume of each cam chamber.
If the above-mentioned conventional technology is applied as is to an engine such as a DOHC engine in which the volume of the oil separator chamber is insufficient, a problem arises in that the oil separation ability is insufficient.

In view of the above, the present invention provides an oil separator device in a cylinder head cover that can improve oil separation ability without complicating the structure even in an engine where the oil separator chamber cannot have a sufficient volume. The purpose is to

(Means for Solving the Problems) In order to achieve the above object, the present invention has an oil separator chamber located above the rotationally driven cam, and an oil separator cover on the lower surface of the labyrinth-forming rib wall of the cylinder head cover. The bent part of the oil separator cover is bent upward, and the bent part of the oil separator cover is placed close to the side of the labyrinth-forming rib wall opposite to the side where the cam splashes lubricating oil. By arranging the bent portion, a downward opening is formed at this position, and the labyrinth-forming rib wall is located on the side where the cam splashes lubricating oil with respect to the bent portion. It is characterized by additionally forming a maze in between.

(Function) According to the present invention, a labyrinth is additionally formed between the bent portion of the oil separator cover and a predetermined portion of the labyrinth-forming rib wall. The oil separation ability of the entire separator can be improved.

Further, according to the present invention, by providing the bent portion close to the side opposite to the side where the cam of the labyrinth-forming rib wall splashes lubricating oil, a downward opening is formed at this position. At the same time, by additionally forming a labyrinth between the bent portion and the labyrinth-forming rib wall located on the side where the cam splashes lubricating oil with respect to the bent portion, the cam can splash the lubricating oil. The blow-by gas with a small amount of lubricant mixed in on the side opposite to the raising side directly flows into the labyrinth (main labyrinth) inside the oil separator chamber from the opening, and the blow-by gas with a large amount of lubricant mixed in on the side opposite to the side where the cam blows up flows directly into the labyrinth (main labyrinth) inside the oil separator chamber. Before entering the main labyrinth, some lubricating oil is separated and removed through the additionally formed labyrinth, so at the time the blow-by gas enters the main labyrinth, the blow-by gas on the side where the cam splashes the lubricating oil is removed. The amount of lubricating oil mixed into the gas and the blow-by gas on the opposite side can be reduced to the same extent.

Furthermore, the present invention has a simple structure that differs from conventional ones in that a part of the oil separator cover is bent upward, and has the advantage that the structure does not become more complicated than conventional ones. We are prepared.

(Example) The illustrated example is an application of the present invention to a DOHC engine.

The DOHC engine shown in FIG. 5 is of a type in which an intake manifold 2 is connected to one side of a cylinder head 1, and an exhaust manifold 3 is connected to the other side, with an intake side cam chamber 4 and an exhaust side cam chamber. 5 are formed separately.

The oil separator device A is not provided in the intake side cam chamber 4, but is provided only in the exhaust side cam chamber 5. The blow-by gas that blows through between the piston 6 and the cylinder bore 7 and enters the crank chamber (not shown) is guided to the exhaust side cam chamber 5 through a communication passage (not shown), and is then lubricated by the oil separator device A. After the oil is separated, it is returned to an intake passage of an air cleaner 9 or the like through a ventilation hose 8. The reason why the oil separator device A is provided in the exhaust side cam chamber 5 is that by arranging the oil separator device A in a position that is easily affected by the heat of exhaust gas, moisture in the blow-by gas is condensed in cold weather. This is to prevent it from getting mixed into the lubricating oil. This can prevent the lubricating oil from becoming cloudy in cold weather. However, in the present invention, the location where the oil separator device A is disposed is not limited, and the oil separator device A may be disposed within the intake cam chamber 4.

A cylinder head cover 10 that closes the exhaust side cam chamber 5 is integrally formed with a labyrinth-forming rib wall 11 as shown in FIGS. 1, 2, and 4. This rib wall 11 includes a rectangular surrounding wall 13 formed along the side wall 17 of the cylinder head cover 10, a plurality of ribs 14 for baffle plates forming a labyrinth within the surrounding wall 13, and the surrounding wall 13. It is composed of a plurality of auxiliary ribs 15 formed in the longitudinal direction between one end surface 16 and the side wall 17.

An inlet 12 for introducing blow-by gas into the surrounding wall 13 is formed on one side of the end surface 16 of the surrounding wall 13, that is, on the side indicated by N in FIGS. 2, 4, and 5. As shown in FIG. 5, the side indicated by N is the side where the oil mist of the lubricating oil B generated by being splashed up by the cam 31 has a lower density in relation to the rotational direction of the camshaft 30, and This is designed to reduce the amount of lubricating oil mixed into the blow-by gas flowing through the inlet 12. The M side, which is opposite to the side indicated by N, is the side where the density of oil mist is high.

The lower surface 13a of the surrounding wall 13 and the lower surface 14a of the baffle plate rib 14 are formed flush with each other, and the auxiliary rib 1
The lower surface 15a of 5 is formed to be located above the lower surfaces 13a and 14a. Also surrounding wall 1
A plurality of screw attachment holes 18 are formed in the lower surface 13a of the holder 3.

On the lower surface of the labyrinth-forming rib wall 11, screws 19 screwed into the screw attachment holes 18 are used.
An oil separator cover 20 is attached that covers substantially the entire lower part of the labyrinth-forming rib wall 11. As shown in FIG. 3, the oil separator cover 20 has a hole 21 through which the screw 19 is inserted, and one corner thereof is bent upward at a substantially right angle. The bent portion 22 formed in this manner forms a downward opening on the N side, and also faces closely to the side of the auxiliary rib 15 on the side closer to the introduction port 12, with a gap P between the two. A maze is additionally formed. Note that 23 is a cut line for forming the bent portion 22.

An oil separator chamber 24 is provided between the labyrinth-forming rib wall 11 and the oil separator cover 20.
is formed, and inside the surrounding wall 13,
A main labyrinth is formed by the baffle ribs 14. Also, on the outside of the surrounding wall 13, a second labyrinth is formed between the auxiliary rib 15 and the oil separator cover 20 as shown in FIG.
A third maze is formed between P and P.

The second maze is, as shown in FIG.
On the side, it has an inlet 26 formed between the oil separator cover 20 and said side wall 17. Therefore, the blow-by gas that passes through the dense part of the oil mist and contains a large amount of lubricating oil passes through the inlet 26 and enters the second labyrinth, where it is subjected to the lubricating oil separation action, and then passes through the third labyrinth P. After passing through the lubricating oil, it enters the main labyrinth through the inlet 12 (the route is followed by the second
It is indicated by m in the figure and FIG. ). Here, the blow-by gas with a small amount of lubricating oil mixed in passes through the low-density part of the oil mist on the N side and directly enters the inlet 12 (its path is indicated by n in FIGS. 2 and 4). join together. The blow-by gas that has entered the main labyrinth via both paths m and n is separated from the lubricating oil, and then flows out from the outlet 25 provided in the cylinder head cover 10 to the ventilation hose 8, and is sent to the air cleaner 9, etc. The air is refluxed into the air intake passage.

Since this embodiment has the above configuration, before the blow-by gas containing a large amount of lubricating oil flowing through the path m enters the main maze, the lubricating oil is separated to some extent in the second maze and the third maze. Can be removed. Therefore, from the route m, the inlet 1
The amount of lubricating oil mixed into the blow-by gas entering 2 can be reduced to the same level as that of the blow-by gas entering the introduction port 12 from the route n, and the lubricating oil can be effectively separated from these blow-by gases in the main labyrinth. Can be removed.

When the present invention is applied to the above embodiment, a part of the oil separator cover 20 is bent upward, and this bent part 22 is connected to the labyrinth-forming rib wall 1.
The third labyrinth P
can be formed.

Furthermore, the present invention can also be applied to engines other than DOHC engines.

(Effects of the invention) Since the invention has the above-mentioned configuration and operation, even in an engine where the oil separator chamber cannot have a sufficient volume, it can be used without complicating the structure.
This has the effect of improving oil separation ability.

In addition, the blow-by gas on the side opposite to the side where the cam is splashed has a small amount of lubricating oil mixed in, and the blow-by gas on the side where the cam is splashed up has a large amount of lubricating oil mixed in, at the time they flow into the labyrinth inside the oil separator chamber. Since the amount of each lubricant mixed in is reduced to the same extent, the oil separation ability works more effectively.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a perspective view showing an example of an oil separator cover, and Fig. 4 is a sectional view showing an example of an oil separator cover.
FIG. 5 shows a longitudinal sectional front view of a DOHC engine equipped with the oil separator device of the above embodiment. DESCRIPTION OF SYMBOLS 10...Cylinder head cover, 11...Maze-forming rib wall, 20...Oil separator cover, 22...Bend portion, 24...Oil separator device, 31...Cam.

Claims (1)

[Scope of utility model registration request] The oil separator chamber located above the rotationally driven cam is formed by attaching the oil separator cover to the lower surface of the maze-forming rib wall of the cylinder head cover, and a part of the oil separator cover is bent upward. the bent part,
By providing the cam of the labyrinth-forming rib wall close to the side opposite to the side on which the lubricating oil is splashed, a downward opening is formed at this position, and the bent portion and the An oil separator device in a cylinder head cover, characterized in that a labyrinth is additionally formed between the bent portion and a labyrinth-forming rib wall located on the side where the cam splashes lubricating oil.