JP2520032Y2 - Engine head cover structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an engine head cover structure such as a cylinder head cover in which oil mist suction holes are formed between plug holes arranged in parallel in the cylinder row direction.

[0002]

2. Description of the Related Art Generally, for example, an actual open shaft 61-
Inserting a gasket as described in Japanese Patent No. 48948,
It has a structure that seals between the two.

By the way, a single plug hole is provided per cylinder in the cylinder head cover along the cylinder row direction, and between these plug holes (between cylinders),
When the oil mist suction port is formed to face the blow-by gas passage on the cylinder head side, the upper end surface of the cylinder head that forms the blow-by gas passage and the lower end surface of the oil baffle plate that forms the oil mist suction port are formed. There is a problem that a gap is formed between them, and the lubricating oil in the valve operating chamber is scattered in the rotation direction when the camshaft is rotated, and the scattered oil enters the oil mist suction port through the gap.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an engine head cover structure capable of reliably preventing scattered oil from entering the oil mist suction port.

[0005]

This invention is a head cover structure for an engine in which plug holes are arranged in parallel in a cylinder head cover, and an oil mist suction port is formed between the plug holes, and the outer circumference of each plug hole. The engine head cover structure is characterized in that a gasket is disposed on the lower surface of the portion, the gaskets are coupled by a coupling portion, and the coupling portion is disposed near the oil mist suction port.

[0006]

According to the present invention, the gaskets provided on the lower surface of the outer peripheral portion of each plug hole are connected to each other by the above-mentioned connecting portion, and the connecting portion is arranged near the oil mist suction port. It is possible to prevent the scattered oil from trying to enter the oil mist suction port during the rotation of the. As a result, it is possible to reliably prevent the scattered oil from entering the oil mist suction port.

[0007]

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

The drawings show the structure of a head cover of a reciprocating engine. In FIGS. 1 and 2, the cylinder head 1 is shown.
The cylinder head cover 3 is attached to the top deck of the cylinder through the head cover gasket 2, and the camshaft bearings 4 and 4 on the cylinder head 1 side and the bearing members attached to the camshaft bearings 4 and 4 with bolts 5 ... The intake side camshaft 7 and the exhaust side camshaft 8 are rotatably mounted by both 6 and 6.

As shown in FIG. 2, the intake side camshaft 7 is integrally formed with two intake cams 9, 9 per cylinder. Similarly, the exhaust side camshaft 8 is provided per cylinder. The two exhaust cams 10, 10 are integrally formed.
Note that, in FIG. 1, for convenience of illustration, the rotational locus of the cam nose of the intake cam 9 is shown by a virtual line α, and the rotational locus of the cam nose of the exhaust cam 10 is shown by a virtual line β.

On the other hand, on the cylinder head cover 3, a predetermined portion of the top deck is projected upward to form a convex portion 3a, and a vertical wall 3b facing downward is integrally formed inside the convex portion 3a. An oil separator chamber 11 surrounded by the vertical wall 3b on four sides is formed, and an oil baffle plate 12 is attached to the lower end surface of the vertical wall 3b forming the oil separator chamber 11, and the lower end of the oil baffle plate 12 is attached. Is opened in a rectangular shape to form the oil mist suction port 13 communicating with the oil separator chamber 11 described above.

Here, as is apparent from FIG. 2, the oil mist suction port 13 described above has a cylinder head cover 3 in which one plug hole 14 per cylinder is arranged in parallel in the cylinder row direction.
In the above, the plug holes 14 are formed corresponding to each other, that is, between the cylinders.

Further, on the cylinder head 1 side facing the oil mist suction port 13 described above, unburned components HC and CO,
A blow-by gas passage 15 for the flow of blow-by gas containing combustion components CO2 or H2 O, N2, etc. is formed, and between the upper end of the blow-by gas passage 15 and the lower end of the oil mist suction port 13 described above. Forms a gap 16.

By the way, the above-mentioned head cover gasket 2 is formed on the peripheral edge portion 2a provided in the concave portion 3c formed at the lower end of the skirt portion of the cylinder head cover 3 and on the lower surface of the outer peripheral portion of each of the plug holes 14, 14 described above. Recess 3
2 and 3d corresponding to plug hole
b and 2b, the head cover gasket 2 of the above-mentioned peripheral edge portion 2a and the head cover gasket 2 of the plug hole corresponding portion 2b on one side are connected by a continuous line portion 2c shown by a solid line in FIG.
Are connected by.

Moreover, the above-mentioned plug hole corresponding portion 2
The head cover gaskets 2b and 2b are connected by a connecting portion 2d as shown in FIG. 2, and the connecting portion 2d is arranged in the vicinity of the oil mist suction port 13 as shown in FIGS. Specifically, the connecting portion 2d is provided on the exhaust side camshaft 8 side so as to close a part of the gap 16 between the lower surface of the oil mist suction port 13 and the upper surface of the blow-by gas passage 15. It is located close to the outside of the rim.

On the intake side camshaft 7 side,
The oil baffle plate 12 is extended further downward from the lower surface of the oil mist suction port 13 so as to close a part of the gap 16 between the lower surface of the oil mist suction port 13 and the upper surface of the blow-by gas passage 15 to form a vertical wall. The part 12a is formed.

In this way, each of the above-mentioned plug holes 14,
Since the plug hole corresponding portions 2b, 2b of the gasket 2 arranged on the lower surface of the outer peripheral portion of 14 are connected to each other by the connecting portion 2d, and the connecting portion 2d is arranged in the vicinity of the oil mist suction port 13 as described above, When the camshaft 8 on the exhaust side rotates in the direction of the arrow in FIG. 1, it is possible to prevent the scattered oil from trying to enter the oil mist suction port 13 by the connecting portion 2d. There is an effect that it is possible to reliably prevent the oil mist from entering the oil mist suction port 13.

When the camshaft 7 on the intake side rotates in the direction of the arrow in FIG. 1, the splashed oil that tries to enter the oil mist suction port 13 is the oil baffle plate 1 described above.
The vertical wall portion 12a formed integrally with the 2 reliably prevents the intrusion.

In the correspondence between the structure of the present invention and the above-mentioned embodiment, the gasket of the present invention corresponds to the head cover gasket 2 of the embodiment, and hereinafter, similarly, the gasket provided on the lower surface of the outer peripheral portion of the plug hole. Corresponds to the plug hole corresponding portion 2b, but the present invention is not limited to the configuration of the above-described embodiment.

For example, in the above embodiment, the connecting portion 2d is provided on the exhaust side camshaft 8 side and the vertical wall portion 12a is provided on the intake side camshaft 7 side. The arrangement structure of 12a may be reversed, or the head cover gasket 2 of the plug hole corresponding portions 2b, 2b may be arranged so as to correspond to the camshafts 7, 8 on both sides of intake and exhaust.
Needless to say, they may be connected to each other by the connecting portions 2d of the book.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a head cover structure of an engine of the present invention.

FIG. 2 is a bottom view of a cylinder head cover.

[Explanation of symbols]

 2 ... Head cover gasket 2b ... Plug hole corresponding part 2d ... Connection part 3 ... Cylinder head cover 13 ... Oil mist suction port 14 ... Plug hole

Claims (1)

(57) [Scope of utility model registration request] 1. A head cover structure for an engine, in which plug holes are arranged in parallel in a cylinder head cover, and an oil mist suction port is formed between the plug holes, wherein a gasket is provided on a lower surface of an outer peripheral portion of each plug hole. ,
A head cover structure for an engine, in which the gaskets are connected by a connecting portion and the connecting portion is disposed in the vicinity of the oil mist suction port.