JP2002070521A - Structure of cylinder head cover for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the height of a gas-liquid separating chamber of blow-by gas and an air cleaner 4 integratedly installed in a cylinder head cover 3 covering the top surface of a cylinder head 1, without decreasing the inner volumes of the gas-liquid separating chamber and the air cleaner. SOLUTION: The gas-liquid separating chamber 5 and the air cleaner 4 are laterally arranged, and the gas-liquid separating chamber 5 is projected in the height direction of the air cleaner 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cylinder head cover mounted on an upper surface of a cylinder head of an internal combustion engine so as to cover a valve operating chamber on the upper surface.

[0002]

2. Description of the Related Art In a conventional internal combustion engine, since a head cover for covering the upper surface of a cylinder head and an air cleaner are formed separately, not only the number of parts is increased, but also the entirety including the air cleaner is quite large. In addition, the size is increased and the weight is increased.

[0003] Therefore, Japanese Patent Application Laid-Open No. Hei 9-11 as prior art is disclosed.
Japanese Patent Publication No. 2358 proposes reducing the number of parts and reducing the size and weight by integrally providing an air cleaner on the upper surface of a cylinder head cover that covers the upper surface of the cylinder head.

[0004]

However, in this prior art, a gas-liquid separation chamber for blow-by gas is formed inside a cylinder head cover, and an air cleaner is integrally provided above the gas-liquid separation chamber. With this configuration, in other words, the cylinder head cover is two-tiered such that an air cleaner is provided above the gas-liquid separation chamber. There is a problem that the height is increased by the amount of the liquid separation chamber.

In this case, reducing the internal volumes of the gas-liquid separation chamber and the air cleaner in order to reduce the height of the entire cylinder head cover is required to reduce the lubricating oil separation performance in the gas-liquid separation chamber and to reduce the intake air by the air cleaner. This may lead to a reduction in noise reduction performance.

An object of the present invention is to provide a cylinder head cover having an air cleaner and a gas-liquid separation chamber whose height is reliably reduced without reducing the internal volumes of the air cleaner and the gas-liquid separation chamber. It is an important subject.

[0007]

In order to achieve this technical object, a first aspect of the present invention is to provide a cylinder head cover for covering an upper surface of a cylinder head, wherein a gas-liquid separation chamber for blow-by gas and an air cleaner are integrated. Wherein the gas-liquid separation chamber and the air cleaner are arranged side by side, and the gas-liquid separation chamber is configured to protrude in the height direction of the air cleaner. " It is.

According to a second aspect of the present invention, in the first aspect, the air cleaner is formed integrally with a cylinder head cover, and a filter element is provided on an upper surface of the dust side case. And a clean side case removably joined with the ignition coil interposed therebetween, and an ignition coil for each cylinder in the internal combustion engine is disposed in the dust side case. "

Furthermore, a third aspect of the present invention is characterized in that, in the first or second aspect, the gas-liquid separation chamber is configured to extend in the direction of the cylinder row in plan view. . "

[0010]

When the gas-liquid separation chamber and the air cleaner are integrally provided on the cylinder head cover, as described above, the gas-liquid separation chamber and the air cleaner are arranged side by side, and the gas-liquid separation chamber is provided with the air cleaner. The height dimension of the gas-liquid separation chamber can be prevented from being added to the height dimension of the entire cylinder head cover as in the prior art. The overall height dimension is reduced without reducing the internal volumes of the gas-liquid separation chamber and the air cleaner, in other words,
The lubricating oil separation performance in the gas-liquid separation chamber and the intake noise reduction performance in the air cleaner can be reduced without lowering.

Further, according to the configuration described in claim 2,
In addition to the effect of the first aspect, the air cleaner also serves as a cover for the ignition coil in each cylinder, and has the effect of cooling each of the ignition coils with air flowing through the air cleaner.

According to the third aspect of the present invention, in addition to the effect of the first aspect or the effect of the second aspect, the internal volume of the gas-liquid separation chamber is increased in the direction of the cylinder row in the internal combustion engine. Since the lubricating oil can be expanded, the lubricating oil separation performance can be further improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a cylinder head in a multi-cylinder internal combustion engine having a plurality of cylinders arranged in a row. The cylinder head 1 has an upper surface for closing a valve mechanism chamber 2 on the upper surface. Cylinder head cover 3
Are detachably joined.

The cylinder head cover 3 is integrally provided with an air cleaner 4 and a gas-liquid separation chamber 5 for blow-by gas.

That is, the cylinder head cover 3
In the internal combustion engine in plan view, the lower dust side case 4a of the air cleaner 4 and the gas-liquid separation chamber 5 are arranged side by side, and the gas-liquid separation chamber 5 projects upward. They are integrally formed so as to extend in the direction of the cylinder row.

An air intake pipe 6 from the atmosphere is connected to the dust side case 4a, and an ignition coil 7 for each cylinder in the internal combustion engine is disposed inside the dust side case 4a.

An upper clean side case 4b of the air cleaner 4 is detachably connected to an upper surface of the dust side case 4a with a filter element 4c interposed therebetween.
An intake duct 10 formed of a bellows tube made of a soft elastic material such as rubber to a throttle body 9 attached to an intake manifold 8 for distributing intake air to each cylinder in the internal combustion engine is connected to the intake duct 10. A blow-by gas outlet pipe 11 is connected from the gas-liquid separation chamber 5.

The intake duct 10 is detachably inserted and connected to the throttle body 9, while a blow-by gas outlet pipe 11 from the gas-liquid separation chamber 5 is detachably connected to the intake duct 10. It is plugged in freely.

In this configuration, the air flowing into the dust side case 4a of the air cleaner 4 from the air intake pipe 6 cools the respective ignition coils 7 provided in the dust side case 4a and then passes through the filter element 4c. After passing through the clean side case 4b, the intake duct 1
The throttle body 9 reaches the throttle body 9 through the cylinder body 0 and is taken into each cylinder of the internal combustion engine through the intake manifold 8 from the throttle body 9.

On the other hand, the blow-by gas in the valve operating mechanism chamber 2 of the cylinder head 1 flows into the gas-liquid separation chamber 5, where the lubricating oil is separated therefrom, and then through the blow-by gas outlet pipe 11. And mixed with the intake air to each cylinder.

In this case, the gas-liquid separation chamber 5 and the air cleaner 4 are arranged side by side, and the gas-liquid separation chamber 5 projects in the height direction of the air cleaner 4, so that the height dimension of the entire cylinder head cover is Without reducing the internal volumes of the gas-liquid separation chamber 5 and the air cleaner 4, in other words,
The lubricating oil separation performance in the gas-liquid separation chamber 5 and the intake noise reduction performance in the air cleaner 4 can be reduced without lowering.

Further, since the gas-liquid separation chamber 5 extends in the direction of each cylinder row in a plan view, the internal volume of the gas-liquid separation chamber 5 can be greatly increased.

[Brief description of the drawings]

FIG. 1 is a partially cut-away longitudinal front view showing an embodiment of the present invention.

FIG. 2 is a plan sectional view taken along line II-II of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Valve train room 3 Cylinder head cover 4 Air cleaner 4a Dust side case 4b Clean side case 5 Gas-liquid separation chamber 6 Air intake line 7 Ignition coil 8 Intake manifold 9 Throttle body 10 Intake duct 11 Blow-by gas outlet line

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 35/04 F02M 35/04 B F02P 15/00 303 F02P 15/00 303E F-term (Reference) 3G015 AA06 BD12 BD23 BE03 BF01 CA04 DA02 EA25 3G019 AA05 EC02 KC10 3G024 AA04 AA72 BA24 CA19 CA26 DA10 DA17

Claims (3)

[Claims] An internal combustion engine in which a gas-liquid separation chamber for blow-by gas and an air cleaner are integrally provided on a cylinder head cover that covers an upper surface of a cylinder head, wherein the gas-liquid separation chamber and the air cleaner are arranged side by side. and,
A structure of a cylinder head cover in an internal combustion engine, wherein the gas-liquid separation chamber is configured to protrude in a height direction of the air cleaner. 2. A cleaner according to claim 1, wherein said air cleaner is detachably joined to a dust side case integrally formed on a cylinder head cover with a filter element interposed between said dust side case and an upper surface of said dust side case. A structure of a cylinder head cover in an internal combustion engine, comprising: a side case; and an ignition coil for each cylinder in the internal combustion engine is disposed in the dust side case. 3. The structure of a cylinder head cover in an internal combustion engine according to claim 1, wherein the gas-liquid separation chamber is configured to extend in the direction of the cylinder rows in plan view.