JPS6319531Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an oil separator for an engine provided above a cylinder head cover.

(Prior art) Generally, the blow-by gas that accumulates in the crank chamber of the engine is returned to the engine intake passage, but the blow-by gas contains a relatively large amount of oil in the form of mist. Therefore, the blow-by gas is once guided to an oil separator, the oil in the blow-by gas is separated and recovered, and then returned to the intake system.

By the way, as this type of oil separator, one in which a separate oil separator is installed on the upper wall of the cylinder head cover is commonly used.
In this case, it is not possible to increase the capacity of the oil separator due to the overall height of the engine, and the blow-by gas is returned to the intake system without sufficient oil separation and is burned together with the blow-by gas, resulting in oil consumption. In addition to the increase in the amount of oil, there is a problem that so-called overrun occurs due to the combustion of oil.

In this regard, Japanese Utility Model Application Publication No. 57-171110 discloses an oil separator in which an upper space inside a cylinder head cover is partitioned by a partition plate, and a maze-like oil drainage passage is formed in this upper space. The oil separator with this structure can use the internal space of the cylinder head cover, so it can have a large capacity, but in order to avoid interference with the cam cap etc. placed in the rocker chamber, it is necessary to There is a problem in that the overall height of the engine naturally becomes taller.

(Purpose of the invention) An object of the invention is to provide a structure in which a large capacity oil separator can be provided on the cylinder head cover without increasing the overall height of the engine.

(Structure of the invention) In order to achieve the above object, the present invention is designed to avoid interference with the upper part of the cam cap of the rocker chamber, which is a problem when forming a large-capacity oil separator chamber in the upper part of the cylinder head cover. To,
Its basic feature is a meandering oil separation passage that bypasses the top of the cam cap.

That is, an oil separator chamber is provided in the upper part of the cylinder head cover, and inside the oil separator chamber, there is a space that protrudes from one side of the chamber toward a side opposite to the one side, and has a space between the oil separator chamber and the opposite side. It has partition walls formed at predetermined intervals, and the partition walls are made to protrude alternately from opposite sides to form a meandering oil separation passage, and one end of the oil separator chamber has a rocker communicating with the crank chamber. One end and the other end of the oil separator chamber are connected to the upper wall of the cylinder head cover in the oil separator of the engine, which is communicated by the oil separation passage. The oil separator chamber is defined by the plate member, and the bottom wall of the oil separator chamber is formed with an opening that surrounds the upper part of the cam cap, and the periphery of the opening forms the meandering passage. The oil separator chamber is surrounded by a wall and separated from the oil separator chamber, and the wall extends to one side of the oil separator chamber, and a predetermined interval is provided between the one side and the opposite side. The cam cap is characterized in that it forms one of the partition walls, and the meandering oil separation passage is formed by bypassing the upper part of the cam cap.

(Effects of the invention) According to the invention, interference with the upper part of the cam cap can be avoided by the opening provided in the bottom wall of the oil separator chamber. It can be installed at a height position of
A large capacity oil separator chamber can be formed without increasing the overall height of the engine. Also,
In the present invention, the wall surrounding the upper part of the cam cap is used as it is as a partition wall defining the meandering oil separation passage, so the volume of the oil separator chamber can be secured to the maximum.

(Example) Hereinafter, embodiments of the present invention will be described in detail.

As shown in FIGS. 1, 2, and 3, an overhead cam mechanism (only cam caps 3 and 3' are shown in the drawings) is provided in the upper space inside the cylinder head cover 1 by means of a plate member 2. An oil separator chamber 5 is formed which is separated from the rocker chamber 4 which accommodates the oil.

That is, this oil separator chamber 5 has a bottom surface formed by the plate member 2, a top surface formed by the top wall 1a of the cylinder head cover 1, and a side wall 1b continuous with the top wall 1a of the cylinder head cover 1, and a peripheral surface formed by the side wall 1b, which is continuous with the top wall 1a of the cylinder head cover 1.
1c and end wall 1d, and a pair of side walls 1b, 1
It is formed by a partition wall 1e provided in advance between 1 and 2c.

In this oil separator chamber 5, partition walls 6, 6 are provided in advance integrally with the upper part of the cylinder head cover 1 and alternately in the width direction of the cylinder head cover 1 at appropriate intervals in the longitudinal direction of the cylinder head cover 1. , . . . form a meandering oil separation passage 7.

A rectangular notch opening 8 is provided at the end of the plate member 2 forming the bottom wall of the oil separator chamber 5 on the side of the end wall 1d, and a rocker opening 8 is provided in the end portion of the plate member 2 forming the bottom wall of the oil separator chamber 5 to communicate with the crank chamber (not shown) of the engine. The chamber 4 and the oil separator chamber 5 are communicated with each other, and the blow-by gas is introduced into the oil separation passage 7, and the blow-by gas is meandered along the oil separation passage 7 as shown by the arrow in FIG. Oil contained in a mist form in blow-by gas is separated by utilizing the difference in inertia between gas and oil. In this way,
The blow-by gas from which the oil has been separated is guided to an intake passage (not shown) of the engine through a blow-by gas conduit 9 opened at the other end of the oil separation passage 7, and is combusted together with the air-fuel mixture within the engine.

Note that this plate member 2 is attached to the upper side walls 1b, 1c of the cylinder head cover 1 and the partition wall 1.
Mounting bracket part 1f provided at appropriate intervals on e,
With bolt 1 in contact with 1f,... from below,
0, 10, . . . are fastened and fixed.

As shown in FIGS. 1 and 2, in order to fix the cylinder head cover 1 to the cam cap 3 with mounting bolts 11, an upward protrusion 12 is formed on the upper part of the integrated cam cap 3. 12 has a bolt hole 1 into which the mounting bolt 11 is screwed.
3 is drilled. Corresponding to the upper part of the cam cap 3 including the protrusion 12, a rectangular notch opening 14 which is elongated in the width direction is previously provided in the plate member 2 so as to surround this upper part.

The notch opening 14 of the plate member 2 located above the cam cap 3 is provided with a three-sided wall 15 formed in advance on the upper part of the cylinder head cover 1 and a part of one side wall 1c of the cylinder head cover 1. A partition wall 6' (distinguished from other partition walls 6) is formed to partition this notch opening 14 from the oil separator chamber 5 (oil separation passage 7),
The oil separation passage 7 is caused to bypass the upper part of the cam cap 3 by this partition wall 6'.

In addition, as shown in FIGS. 1 and 3, the upper part of the inner cam cap 3' and its fixing bolt 16, which is not provided with the protrusion 12 for attaching the cylinder head cover, should be careful not to interfere with it. The plate member 2 is punched upward to form the punched part 1.
7, 17'.

In addition, in FIGS. 1 to 3, 18 is a seal rubber fitted to the lower edge of the cylinder head cover 1.

With the above structure, the oil separator chamber 5 can be formed in the upper part of the cylinder head cover 1 which has the same height as the conventional one, so there is no need to increase the overall height of the engine and the oil separator chamber 5 can have a large capacity. can be provided.

In addition, instead of the above configuration, the height of the cylinder head cover 1 is lowered to a position slightly higher than the height of the cam caps 3, 3', and the upper wall of the cylinder head cover covers the bottom of the oil separator chamber. It goes without saying that a wall may be formed and the upper part of the oil separator chamber may be covered by a plate member.

[Brief explanation of the drawing]

Figure 1 is a horizontal sectional view of the oil separator taken horizontally from the upper part of the cylinder head cover, and Figures 2 and 3 are lines AA and B in Figure 1, respectively.
- It is a longitudinal cross-sectional view in the B line direction. 1...Cylinder head cover, 2...Plate member, 3...Cam cap, 4...Rocker chamber,
5...Oil separator chamber, 6,...,6,6'...
...Partition wall, 7...Oil separation passage, 8...Notch opening, 9...Blow-by gas conduit, 14...Notch opening, 15...Three-sided wall.

Claims (1)

[Claims for Utility Model Registration] An oil separator chamber is provided in the upper part of the cylinder head cover, and within the oil separator chamber, the oil separator chamber protrudes from one side of the chamber to the side opposite to the one side. The oil separator chamber has partition walls formed at a predetermined distance from the side parts, and the partition walls protrude alternately from the opposing sides to form a meandering oil separation passage. In the oil separator of the engine, the oil separator chamber is opened to a rocker chamber communicating with the crank chamber, and the other end thereof is communicated with the intake passage of the engine, and one end and the other end of the oil separator chamber are communicated with each other by the oil separation passage. The oil separator chamber is defined by the upper wall of the cylinder head cover and the plate member, and the bottom wall of the oil separator chamber is formed with an opening that surrounds the upper part of the cam cap, and the opening has a periphery that extends in the meandering direction. It is surrounded by a wall that forms a shaped passageway and is separated from the oil separator chamber, and the wall extends to one side of the oil separator chamber and is connected to the opposite side of the oil separator chamber. An oil separator for an engine, characterized in that one of the partition walls is formed by leaving a predetermined interval therebetween, and the meandering oil separation passage is formed by bypassing the upper part of the cam cap.