JPS6318742Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil separator provided inside a cylinder head cover of an engine for separating blow-by gas into gas and liquid.

Generally, an engine is driven by sucking a mixture of fuel and air into a cylinder, compressing it with a piston, and then igniting and exploding it. In this case, in order for the piston and cylinder to slide smoothly, there is a small gap between them, and although piston rings, etc. are used to prevent leakage from this gap, high-pressure gas during compression and explosion It is not possible to completely stop leaks, and it is inevitable that a small amount of leakage (so-called blow-by gas) will occur. This blowby gas fills the inside of the crankcase and the cylinder head cover that communicates with the crankcase, and if left unattended, it must be released to the outside in order to gradually increase the internal pressure. However, the crankshaft, connecting rods, etc. move at high speed inside the crankcase, and the rocker arm, valves, etc. are also operating inside the cylinder head cover, and these movements can cause the internal oil to be scattered. It becomes a mist and fills the inside.
For this reason, if blow-by gas is taken out directly to the outside, the mist of oil that mixes with it will also be taken out, leading to an increase in engine oil consumption and the pipes used to take out the gas becoming clogged with oil. There is a problem with doing so.

For this reason, for example, as a device for effectively performing gas-liquid separation (separation of blow-by gas and oil),
As shown in Utility Model Application No. 56-83618, a space is formed by providing a buff-full plate on the inner surface of the cylinder head cover, this space is partitioned in a meandering manner by a partition wall, and blow-by is carried out in a meandering manner along the partition wall. It has been proposed to pass gas through the partition wall to attach oil to the partition wall, separate the oil, and then extract only the blow-by gas to the outside.

If this structure is used, oil mixed in blow-by gas can be separated to a large extent, but oil is expensive, and when oil leaks outside, dirt tends to adhere to the areas where oil adheres, resulting in a dirty appearance. Therefore, it is desirable to remove oil more efficiently.

In addition, the oil separated as described above is
It flows slowly through the meandering space and is collected by the engine outside the separation space, so it may be pushed back by blow-by gas on the way, or when the gas pressure becomes particularly high, it becomes atomized again and is exhausted and consumed along with the blow-by gas. There is a risk of being

In view of these circumstances, the present invention is an oil that can effectively perform gas-liquid separation (separation of blow-by gas and oil) of blow-by gas in an engine and that can quickly guide the separated oil out of the separation space. The purpose is to provide a separator.

The oil separator of the present invention has a buff-full plate arranged on the inner surface of the cylinder head cover of the engine to form a space between the cylinder head cover and the buff-full plate, and this space is partitioned into a serpentine shape by a partition wall. In addition, an oil flow groove is formed in the double plate, and the oil flow groove extends in a direction substantially perpendicular to the partition wall and has a longitudinal extension opening outside the space. A gas-liquid separation rib located above the groove and extending along the oil flow groove is provided on the partition wall.

According to the present invention, the space formed by the buff-full plate on the inner surface of the cylinder head cover is partitioned into a serpentine shape by a partition wall, and the blow-by gas is passed in a serpentine manner along the partition wall. Since the ribs are extended and oil flow grooves are provided below these ribs, the blow-by gas mixed with the oil flowing along the partition wall in the form of a mist can be prevented from acting as a barrier board. Collisions with the liquid separation ribs can cause a large amount of oil to adhere to the ribs, especially in this area, and the adhered oil immediately falls along the ribs into the flow groove below, unaffected by the flow of blow-by gas. can be returned to the engine through the flow groove. For this reason, compared to a case where there is no gas-liquid separation rib and only a partition wall is used, the liquid oil immediately flows down into the oil flow groove and is not pushed back by blow-by gas, allowing for more effective gas-liquid separation. can be done.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the cylinder head cover, taken along the center of the oil flow groove of the buffle plate. FIG. 2 is a view of the inner surface of the cylinder head cover taken along the arrow A--A in FIG. 1, and the oil flow groove is indicated by a two-dot chain line (imaginary line) in the figure. Hereinafter, the explanation will be made using FIG. 1 and FIG. 2 together.

The inner surface of the cylinder head cover 1 of the engine is provided with a wall 7 having a substantially rectangular shape and extending downward from the inner upper surface of the cylinder head cover 1.
The lower end of this wall 7 is on the same plane, and
At the end of the cylinder head cover 1, a portion of the wall 7 has an opening 5. A hole 6 is bored into the upper surface of the cylinder head at a corner opposite to the open portion 5 inside the wall 7, and a tube 6a having a hole communicating with this hole 6 is fixed to the upper surface of the cylinder head. A flat but full plate 2 that fits the almost rectangular shape surrounded by the wall 7.
is attached from below with bolts or the like (not shown) so as to be in contact with the lower end surface of the wall 7. A space 10 having an open portion 5 is formed. In addition, although the full plate 2 has a flat plate shape, it extends in the longitudinal direction at the center of its approximately rectangular shape, and is concave downward.
A tapered oil flow groove 2a is provided so that the recess gradually becomes deeper from the hole 6 toward the open portion 5. Therefore, the space 10 has an oil flow section 8 which is another open section in addition to the open section 5.

In the case of the above configuration, the blow-by gas enters the space 10 from the opening 5, passes through the hole 6 and the tube 6a, and then connects a hose to the tube 6a to communicate with the intake passage, and is connected to the intake system. It can be returned. Furthermore, the oil separated into gas and liquid within this space 10 flows along the oil flow groove 2a and is returned into the engine from the oil flow lower part 8. However, this makes it difficult to achieve sufficient gas-liquid separation, and in the embodiment of the present invention, the partition wall 3
a, 3b,...3h and gas-liquid separation ribs 4b, 4
c, 4d, and 4e to effectively perform gas-liquid separation.

The partition walls 3a, 3b, . It is provided so as to be partitioned in a meandering manner from the open part 5 toward the hole 6. Furthermore, above the oil flow groove 2a, gas-liquid separation ribs 4b, 4c, 4
d and 4e connect one end to the partition walls 3b and 3, respectively.
c, 3d, and 3e, and extends along the oil flow groove 2a.

The oil flow groove 2a is formed to extend in a direction substantially perpendicular to the partition walls 3b, 3c, . . . , 3g.

In the oil separator configured as above,
The blow-by gas that flows into the space 10 from the opening 5 flows in a meandering manner along the partition walls 3a, 3b,...3h, so there are many opportunities for oil to hit the walls and adhere to the walls and become liquid and flow downward, as well as to prevent gas and liquid from flowing down. Since the separation ribs 4b, 4c, 4d, and 4e act as baffles that impede the flow of blow-by gas, oil is particularly likely to adhere to these portions (shaded portions in the figure). Moreover, the oil adhering to this area falls directly into the oil flow groove 2a, and the oil flows along this groove 2a and can be returned into the engine from the flow flow part 8, so that it may not be pushed back by blow-by gas or re-entered. It is less likely to become atomized, and the oil in the blow-by gas can be effectively separated.

As explained in detail above, according to the oil separator of the present invention, the space formed by the inner surface of the cylinder head cover and the buff-full plate is partitioned into a serpentine shape by a partition wall, and the buff-full plate has an oil flow groove. , and a gas-liquid separation rib located above the oil flow groove and extending along the oil flow groove is provided on the partition wall.
The blow-by gas flows in a meandering manner and hits the gas-liquid separation ribs that act as a wall plate, and in this part in particular, a large amount of oil can adhere to the wall and be separated. Moreover, this gas-liquid separated oil falls directly into the oil flow groove below the gas-liquid separation rib and flows out along this groove, so it may be pushed back by the inflowing blow-by gas or become atomized again. There is little chance of fading, and gas-liquid separation can be carried out effectively, allowing rapid recovery.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the cylinder head cover, and FIG. 2 is a bottom view of the cylinder head cover. 1... Cylinder head cover, 2... Buff full plate, 2a... Oil flow groove, 3a, 3b,
...3h...Partition wall, 4b, 4c, 4d, 4e...
Rib for gas-liquid separation, 5...opening part, 8...oil flow part.

Claims (1)

[Scope of utility model registration request] A wall protruding downward from the inner upper surface of the cylinder head cover, a buff-full plate disposed to cover the area surrounded by the wall, a space formed by the buff-full plate and the wall, and one end of which is An oil separator for an engine comprising a plurality of partition walls that are connected to a wall, extend downward from the inner upper surface of the cylinder head cover, have lower ends flush with the lower end of the wall, and partition the space in a meandering manner. An oil flow groove is formed in the double plate, extending in a direction substantially perpendicular to the plurality of partition walls and having a longitudinal extension opening outside the space, and located above the oil flow groove. An oil separator for an engine, characterized in that a gas-liquid separation rib extending along the oil flow groove is provided on the partition wall.