JPH029053Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement in the structure of an oil separator for an engine.

(Prior Art) Generally, an engine is provided with a blowby gas processing device that returns blowby gas leaking into the crankcase from the fuel chamber to the intake passage and refuels it together with the air-fuel mixture in the fuel chamber. Usually, an oil separator chamber is provided in the cylinder head cover, and by introducing the blow-by gas into the oil separator chamber and passing it through the chamber, oil mist mixed with the blow-by gas in the crankcase etc. is removed. It is removed from the blow-by gas and collected into the crankcase.

By the way, the third type of oil separator installed inside the engine cylinder head cover is
As shown in the figure, a partition plate 3 having small holes 2 is attached to a container-shaped oil separator 1, and oil recovery grooves 4 are formed vertically and horizontally on the bottom surface of the oil separator 1. (Refer to Utility Model Application Publication No. 161010/1983).

However, in the oil separator 1, oil recovery grooves 4 are formed vertically and horizontally on the bottom surface, so the oil collected and accumulated in the grooves 4 is transmitted through the grooves 4 due to the flow velocity of the blow-by gas. However, there is a problem in that oil is supplied to the intake system together with blow-by gas all at once from the oil outlet, resulting in so-called oil rising.

(Purpose of the invention) The present invention was made to solve the above-mentioned conventional problems, and its purpose is to reliably prevent oil from rising to the oil separator with a simple structure.

(Structure of the invention) Therefore, the present invention provides an engine in which the oil separator chamber is integrally formed in the upper part of the cylinder head cover, in which the lower part of the oil separator chamber is closed by a substantially horizontal flat oil buffer plate. Baffle plates are integrally formed that extend downward from the ceiling wall of the cylinder head cover and at the same time protrude alternately from both inner surfaces of the inner circumferential wall of the oil separator chamber to cause the blow-by gas to meander. The lower edge of the base of the baffle plate is set to be at a lower position than the lower edge of the base of the baffle plate in one row on the other side, and each base of the baffle plate in one row on one side has a corner portion in contact with the above-mentioned buttful plate. It is characterized by a series of notches.

(Effects of the invention) According to the invention, a series of baffle plates are provided at the base corners of a row of baffle plates on one side of the lower side that are integrally formed astride the ceiling wall of the cylinder head cover and the inner wall of the oil separator chamber. Since the notch is formed, the collected oil does not collect and accumulate in the groove etc. as in the conventional method, but is immediately discharged from the oil outlet through the notch. Oil leakage can be reliably prevented.

Furthermore, since it is not necessary to form concave grooves on the oil buff full plate (bottom surface of the oil separator) using a press or the like, flatness can be easily ensured and productivity can also be improved.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The engine shown in FIG. 1 is a DOHC engine with two camshafts disposed above the cylinder head.

In the figure, a fuel chamber 2 of an engine 1 is formed by a cylinder block 4 in which a plurality of cylinders 3 are arranged in a row.
and a piston 5 that reciprocates within the cylinder 3.
and a cylinder head 7 installed above the cylinder block 4 via a gasket 6.

Further, the cylinder head 7 is provided with an intake port 8 and an exhaust port 9 for each fuel chamber 2, and one ends of both ports 8 and 9 are opened to the fuel chamber 2 through an intake valve 10 and an exhaust valve 11. and the other ends are opened on both sides of the cylinder head 7, respectively. Further, above both sides of the cylinder head 7, an intake camshaft 12 and an exhaust camshaft 13 extending in the row direction of the cylinders 3 are connected to cam caps 14, 14.
These camshafts 12,
Intake cam 12a formed in 13, exhaust cam 13
a opens the intake and exhaust valves 10 and 11, which are biased in the closing direction by valve springs 16 and 16, through tappets 15 and 15.

Above the intake and exhaust camshafts 12 and 13, a seal member 1 is attached to the upper end surface of the cylinder head 7.
Head cover 18 attached via 7, 17,
An oil separator chamber 20 is integrally formed inside and above the head cover 18 on the intake camshaft 12 side.

The oil separator chamber 20 is connected to the head cover 1.
As is clear from Figure 2, which shows 8 from the bottom,
A peripheral wall 21 in the shape of an oblong rectangular frame is integrally suspended from the ceiling wall 19 of the head cover 18, and a substantially horizontal flat plate-like buff-full plate 23 is attached to the lower part of the peripheral wall 21 with screws 22, . . . , 22. and is configured in a closed state.

Baffle plates 24, ..., 25, ..., which protrude alternately at predetermined intervals in the longitudinal direction and make the blow-by gas meander, are integrally formed on both inner surfaces of the longitudinal peripheral walls 21a, 21a of the oil separator chamber 20. It is provided.

The height of each of the baffle plates 24 and 25 is set so that the baffle plates 24 and 25 extend downward from the ceiling wall 19 of the head cover 18, and their lower edges abut against the baffle plate 23.

Further, the lower edges of the bases 24a of the baffle plates 24 in one row on one side (the left side in FIG. 1, the lower side in FIG. 2) are located at a lower position than the lower edges of the bases 25a of the baffle plates 25 in one row on the other side. is set to .

In other words, the baffle plate 23 is installed in a slightly downward position to the left in FIG. 1.

In this regard, if the engine is a V-type engine, the entire head cover is inclined, so there is no particular need to install the baffle plate 23 in a downward-left position.

A series of notches 26, . . . , 26 are formed in each base portion 24a of the baffle plates 24 arranged in one row on one side at the corner portions in contact with the baffle plate 23.

A blow-by gas inlet 27 is provided at the right corner in the longitudinal direction of the oil separator chamber 20, and a blow-by gas outlet 28 which also serves as an oil outlet is provided at the left corner in the longitudinal direction.

With the above configuration, the blow-by gas supplied to the oil separator chamber 20 from the inlet 27 is meandered by the baffle plates 24 and 25, and is supplied to the intake system from the outlet 28.

In the middle of this meandering, blow-by gas flows through the surrounding wall 21.
Since the blow-by gas collides with the blow-by gas and the baffle plates 24, 25, etc., the oil adheres to these and is separated from the blow-by gas.

The oil adhering to the peripheral wall 21 and the baffle plates 24 and 25 naturally flows to the base 24a of the baffle plate 24 at a lower position due to its gravity, and is immediately discharged from the outlet 28 through a series of notches 26 without accumulating. From the middle, it passes through a special passage and is collected into the crankcase.

Therefore, unlike in conventional oil recovery grooves, oil does not accumulate, so oil does not rise up.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an engine employing an oil separator structure according to the present invention, FIG. 2 is a bottom view of a cylinder head cover, and FIG. 3 is a perspective view of a conventional oil separator. 18... Cylinder head cover, 20... Oil separator chamber, 21... Peripheral wall, 23... Bumpful plate, 24, 25... Baffle plate, 24a, 2
5a... Base, 26... Notch.

Claims (1)

[Scope of Claim for Utility Model Registration] In an engine in which an oil separator chamber is integrally formed in the upper part of the cylinder head cover, the lower part of the oil separator chamber is closed by a substantially horizontal flat oil buffer plate, Baffle plates are integrally formed that extend downward from the ceiling wall of the cylinder head cover and at the same time protrude alternately from both inner surfaces of the inner circumferential wall of the oil separator chamber to cause the blow-by gas to meander. The lower edge of the base is set to be at a lower position than the lower edge of the base of the baffle plates in one row on the other side, and each base of the baffle plates in one row on one side has a series of cuts at the corner portion that contacts the baffle plate. An engine oil separator structure characterized by the formation of a notch.