JPH1162702A - Draining structure for cylinder head cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent submergence due to rain water or car washing by a drain hole part, facilitate draining even when water comes in from the extending side of a high tension cord because of parking in a sloped site or centrifugal force in cornering, and impede flow of water and oil to an exhaust manifold by a guide part. SOLUTION: A drain hole part 16 communicating the vicinity of an ignition plug hole part with an outer periphery part is disposed in other end side of a cylinder head cover 2, a breather chamber extending to a direction crossing the drain hole part 16 is arranged in a lower part of the cylinder head cover 2, and an inlet part of the breather chamber is provided to be located in the vicinity of the drain hole part 16 in terms of top view. An engine oil filling port 26 is provided in the vicinity of the drain hole part 16, and a guide part 28 impeding flow of water and oil to an exhaust manifold side is integrally arranged in a more front side and lower portion than the drain hole part 16 in the cylinder head cover 2 and the engine oil filling port 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water draining structure for a cylinder head cover, and more particularly, to a water draining hole provided at the other end of the cylinder head cover for connecting the vicinity of a spark plug hole to an outer peripheral portion. The part prevents rainwater and flooding during car washing, and even if water enters from the extension side of the high tension cord due to parking on slopes or cornering centrifugal force, it can be easily discharged, and rust generation and Poor contact can be prevented, ignition can be performed reliably, and since the upper part of the drain hole is not open, there is no danger of water or dust entering, and the upper cover functions effectively. The present invention relates to a drain structure for a cylinder head cover.

In addition, a guide portion is integrally provided at a position in front of and below the drain hole of the cylinder head cover and the engine oil inlet, and water (including oil) discharged from the drain hole by the guide portion. The present invention relates to a water draining structure for a cylinder head cover that can guide oil spilled during injection of engine oil and engine oil, and that can prevent flow of water or oil to the exhaust manifold side.

[0003]

2. Description of the Related Art In a four-cycle engine mounted on a vehicle, a cylinder head cover is provided on an upper surface of a cylinder head, and a breather plate is provided inside the cylinder head cover to form a breather chamber. Oil-gas separation.

[0004]

In the conventional cylinder head cover, it is necessary to increase the volume of the breather chamber in the cylinder head cover in order to efficiently separate the gas in the blow-by gas from gas and liquid.

[0005] However, in order to manage the plug cap, the high tension cord, and the like while ensuring a large volume of the breather chamber, it is necessary to form the ignition plug hole relatively lower than other parts. is there.

That is, as shown in FIGS. 19 and 20, the cylinder head cover 102 is mounted on the upper surface of the cylinder head 142 of the engine 140, the ignition plug 146 is provided so as to reach the combustion chamber 144, and the plug cap 148 is attached. It is mounted, and a breather chamber 110 is formed in the cylinder head cover 102.

At this time, the spark plug hole 112 is formed at a position relatively lower than other portions, and water and dust easily accumulate in the annular concave portion 122 surrounding the spark plug hole 112. In some cases, this may cause poor contact between the spark plug 146 and the plug cap 148 due to generation of rust or intrusion of water, and improvements have been made.

As a measure for preventing the above-mentioned problem, there is a method in which an upper cover is provided to cover the ignition plug hole of the cylinder head cover.

More specifically, as shown in FIG. 21, a high tension cord 214 is provided to reach the ignition plug hole 212 of the cylinder head cover 202, and the extension side of the high tension cord 214, ie, the right side in FIG. The ends are open.

However, this high tension code 214
As shown in FIG. 22, when water or dust intrudes into the portion covered by the upper cover 204 from the open portion at the right end in FIG. In FIG. 21, which is the extension side of the high tension cord 214 of the head cover 202, if the height position of the open portion at the right end becomes large, the intruded water or dust moves to the side away from the open portion. There is an inconvenience that it is difficult to remove dust and dirt.

In order to solve this inconvenience, there is a type in which a drain groove is provided on a side of the high tension cord which is separated from an open portion which is an extension side.

That is, as shown in FIGS. 23 and 24, a drain groove 350 for connecting a portion covered by the upper cover 304 and an outer peripheral portion of the cylinder head cover 302.
Are provided on the cylinder head cover 302.

However, as is clear from FIGS. 23 and 24, since the upper portion of the drain groove 350 is open, the portion where water and dust from above the drain groove 350 are covered by the upper cover 304 is removed. And the effect of the upper cover 304 is weakened, which is disadvantageous in practical use.

When water comes in from above the cylinder head cover 402, as shown in FIGS. 25 and 26, the water is applied to the upper cover 4 provided on the cylinder head cover 402.
It hits 04 and flows in all directions.

At this time, since the upper cover 404 is formed in a substantially flat shape, a part of water invades into an area covered by the upper cover 404 from an open area where the high tension cord 414 extends. There is a disadvantage of doing so.

[0016]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides a breather chamber which is mounted on an upper surface of a cylinder head of an engine and has a breather plate disposed therein to form a breather chamber. In the cylinder head cover for separating gas and liquid of the oil, a high tension is provided in the cylinder head cover, which is provided with an ignition plug hole, communicates with the ignition plug mounted in the ignition plug hole, and extends to one end of the cylinder head cover. A cord is provided, an upper cover for covering the upper surface of the ignition plug hole and the high tension cord is provided, and a drain hole for connecting the vicinity of the ignition plug hole and an outer peripheral portion is provided on the other end side of the cylinder head cover. And providing the breather chamber extending in a direction crossing the drain hole at a lower portion of the cylinder head cover. Characterized by providing to sit near the drain hole portion in plan view the inlet portion of the breather chamber.

Also, in a cylinder head cover mounted on the upper surface of a cylinder head of an engine and having a breather plate disposed therein to form a breather chamber for separating gas and liquid of oil in the breather chamber, an ignition plug is provided on the cylinder head cover. A high tension cord is provided to communicate with the ignition plug mounted in the ignition plug hole and extend to one end of the cylinder head cover, and covers the upper surface of the ignition plug hole and the high tension cord. An upper cover is provided, a water drain hole is provided on the other end side of the cylinder head cover to connect the vicinity of the ignition plug hole and the outer peripheral portion, and an engine oil inlet is provided near the water drain hole, and the engine is mounted. When mounted at an angle to the front of the vehicle and the exhaust manifold located in front of the engine Serial on the front side and lower portion than the water drain hole and the engine oil inlet of the cylinder head cover, characterized in that integrally formed a guide portion for preventing the flow of water or oil to the exhaust manifold side.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS With the above configuration,
The drain holes prevent rainwater and flooding during car washing.Even if water enters from the extension side of the high tension cord due to parking on a slope or cornering centrifugal force, it can be easily drained to prevent rust and poor contact. In this way, the upper cover is made to function effectively, since there is no danger of water or dust entering due to the fact that the upper part of the drain hole is not opened.

The guide guides water (including oil) discharged from the drain hole and oil spilled at the time of injection of engine oil to prevent the flow of water or oil to the exhaust manifold side. .

[0020]

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

1 to 18 show an embodiment of the present invention. 1 to 3, reference numeral 2 denotes a cylinder head cover mounted on the upper surface of a cylinder head (not shown) of an engine (not shown), and reference numeral 4 denotes an upper cover.

A breather plate 6 is provided on the cylinder head cover 2 as shown in FIG. As shown in FIG. 3, the breather plate 6 has a partition wall 8, and the partition wall 8 forms a breather chamber 10.

Further, a plurality of, for example, four, spark plug holes 12 are provided in the cylinder head cover 2 to communicate with a spark plug (not shown) mounted in the spark plug hole 12 and to one end of the cylinder head cover 2. A high tension cord 14 extending to the right (in FIG. 1) is provided, and an upper cover 4 that covers the upper surface of the ignition plug hole 12 and the high tension cord 14 is provided. The upper cover 4 is formed in a shape as shown in FIGS. 5 to 14 and is provided for the purpose of simple waterproofing and improving the appearance.

On the other end side (left side in FIG. 1) of the cylinder head cover 2, a drain hole 16 is provided to connect the vicinity of the ignition plug hole 12 and the outer peripheral portion of the cylinder head cover 2. At the lower portion, the breather chamber 10 extending in a direction crossing the drain hole 16 is provided, and an inlet 18 of the breather chamber 10 is provided.
Is configured to be located near the drain hole 16 in plan view.

More specifically, as shown in FIGS. 1, 2, 5 and 9, the upper cover 4 extends upward from the end of the high tension cord 14 on the extension side (the right side in FIG. 1). Is provided with a protruding portion 20 protruding therefrom.

When the drain hole 16 is formed on the other end side (left side in FIG. 1) of the cylinder head cover 2 so as to connect the vicinity of the ignition plug hole 12 and the outer peripheral portion of the cylinder head cover 2 with each other. As shown in FIGS. 1 and 2, the cylinder head cover 2 is provided so as to open at an outer peripheral portion of the cylinder head cover 2, for example, at a front side (a lower side in FIG. 1) of an engine (not shown).

At this time, the drain hole 16 is formed as shown in FIG.
As shown in FIG. 3, the annular recess 22 surrounding the spark plug hole 12 is provided so as to communicate with the lowest portion, and is formed, for example, in a substantially horizontal state.

The state of formation of the drain holes 16 varies depending on the state of the vehicle in order to efficiently drain water. That is, in this embodiment, as shown in FIG. 18, it is assumed that the cylinder head cover 2 is mounted in a state in which the cylinder head cover 2 is inclined in the vehicle forward direction by an appropriate angle θ, and when the cylinder head cover 2 is not inclined, The drain hole 16 is formed so as to be inclined so as to descend toward the front side of the vehicle.

The breather chamber 10 is formed so as to extend in a direction crossing the drain hole 16, that is, from the left side to the right side in FIG.
The first and second inlet portions 18-1 and 18-2 are located near the drain hole 16 in a plan view, that is, on the left side of the boss 24 for the drain hole 16 as shown in FIG. 3. First
An inlet 18-1 is provided, and a second inlet 18-2 is provided on the right side of the boss 24.

Further, an engine oil inlet 26 is provided in the vicinity of the drain hole 16 to mount an engine (not shown) at an angle to the front of the vehicle and to position an exhaust manifold (not shown) in front of the engine. Further, a guide portion 28 for preventing the flow of water or oil to the exhaust manifold side is provided integrally with a portion of the cylinder head cover 2 in front of and below the drain hole 16 and the engine oil inlet 26.

That is, the guide portion 28 is provided at a position in front (lower in FIG. 1) and lower (lower in FIG. 2) of the drain hole 16 and the engine oil inlet 26 of the cylinder head cover 2. It is.

The guide portion 28 controls the water flowing out of the drain hole 16 of the cylinder head cover 2 as shown in FIG.
When the engine oil injected from the engine oil inlet 26 is spilled, the spilled engine oil is also guided to the left in FIG. 1 so that the flow of water and oil to the exhaust manifold side is performed. Has been blocked.

Reference numeral 30 denotes the breather plate 6
Ribs for oil separation formed on the surface, FIGS. 3 and 4
3 indicate the flow of blow-by gas, and the thin arrows in FIGS. 3 and 4 indicate the flow of oil.

Next, the operation will be described.

The water that has entered the annular concave portion 24 surrounding the ignition plug hole 12 is mounted with the cylinder head cover 2 inclined at an appropriate angle θ in the vehicle forward direction as shown in FIG. As a result, the water is discharged to the outside of the cylinder head cover 2 through the drain hole 16.

The water discharged to the outside of the cylinder head cover 2 by the drain hole 16 is guided to the left side in FIG. 1 by the guide portion 28 as shown in FIG.

When the engine oil injected from the engine oil inlet 26 is spilled, the spilled engine oil is guided to the left side in FIG. 1 by the guide portion 28.

Further, when water comes in from above the cylinder head cover 2, as shown in FIGS. 15 and 16, the water hits the upper cover 4 disposed on the cylinder head cover 2 and flows in all directions.

At this time, a projection 20 provided at the end of the upper cover 4 on the extension side of the high tension cord 14 is provided.
However, it prevents the flow of water to the open portion, which is the extension side of the high tension cord 14, and prevents water from entering the portion covered by the upper cover 4.

Thus, rainwater and flooding during car washing can be prevented by the drain hole 16.
Even if water intrudes from the extension side of the high tension cord 14 due to parking on a slope or cornering centrifugal force, it can be easily drained, rusting and poor contact can be prevented, and ignition can be reliably performed. Since the upper portion of the drain hole 16 is not opened, there is no danger of water or dust entering the upper cover 4 and the upper cover 4 functions effectively, which is practically advantageous.

A boss 24 for the drain hole 16 is provided.
Projecting into the breather chamber 10, the boss portion 24
As a result, the flow of the blow-by gas is suddenly changed in direction, so that the gas-liquid separation of the blow-by gas can be promoted, and the rib 30 for oil separation formed on the breather plate 6 can be reduced. It is.

Further, the drainage hole 16 is less unnatural in appearance than in the conventional drainage groove, and can contribute to improvement in appearance.

Further, the projection 20 is provided at the end of the upper cover 4 on the extension side of the high tension cord 14, so that the projection 20 allows water to flow to the open portion on the extension side of the high tension cord 14. To prevent sneaking around,
Water can be prevented from entering the area covered by the upper cover 4, which is practically advantageous.

A guide portion 28 for preventing the flow of water or oil to the exhaust manifold side is integrally formed at a position in front of and below the drain hole 16 and the engine oil inlet 26 of the cylinder head cover 2. With this arrangement, it is possible to guide water (including oil) discharged from the drain hole 16 by the guide portion 28 and oil spilled at the time of injection of engine oil, and the flow of water and oil to the exhaust manifold side. Can be prevented, and generation of white smoke due to oil can be prevented when the exhaust manifold is hot.

[0045]

As described above in detail, according to the present invention, a breather chamber is formed by mounting a breather plate inside the cylinder head of an engine and forming a breather chamber therein, and gas-liquid separation of oil in the breather chamber is performed. In the cylinder head cover, a hole for the ignition plug is provided in the cylinder head cover, and a high tension cord is provided which communicates with the ignition plug attached to the hole for the ignition plug and extends to one end of the cylinder head cover. An upper cover that covers the hole and the upper surface of the high tension cord is provided, a water drain hole is provided at the other end of the cylinder head cover to connect the vicinity of the hole for the ignition plug to an outer peripheral portion, and a water drain hole is provided at a lower portion of the cylinder head cover. Providing the breather chamber extending in a direction crossing the Since it is located near the drain hole, the drain hole prevents rainwater and flooding during car washing, and water enters from the extension side of the high tension cord due to parking on slopes and centrifugal force at cornering. Can be easily discharged, rust can be prevented and poor contact can be prevented, ignition can be reliably performed, and water and dust can be prevented because the upper part of the drain hole is not opened. There is no danger that the upper cover will function effectively, which is practically advantageous.

In a cylinder head cover which is mounted on the upper surface of the cylinder head of the engine and has a breather plate therein to form a breather chamber for separating gas and liquid of oil in the breather chamber, the cylinder head cover is provided with a spark plug. An upper cover for providing a hole, a high tension cord extending to one end of the cylinder head cover and communicating with a spark plug mounted in the hole for the spark plug, and covering an upper surface of the hole for the spark plug and the high tension cord; Is provided at the other end of the cylinder head cover, a drain hole is provided to connect the vicinity of the spark plug hole and the outer peripheral portion, an engine oil inlet is provided near the drain hole, and the engine is inclined forward of the vehicle. When the exhaust manifold is located in front of the engine and the cylinder head cover A guide portion for preventing the flow of water and oil to the exhaust manifold side is integrally provided at a position forward and below the drainage hole and the engine oil inlet, so that the drainage hole allows rainwater or vehicle washing. In addition to preventing flooding, even if water intrudes from the extension side of the high tension cord due to parking on a slope or cornering centrifugal force, it can be easily drained, preventing rust and poor contact. The ignition can be performed reliably, and since the upper part of the drain hole is not opened, there is no danger of water or dust entering, and the upper cover functions effectively, which is practically advantageous. is there. In addition, since the guide portion is integrally provided on the cylinder head cover at a position in front of and below the drain hole and the engine oil inlet, water (including oil) discharged from the drain hole by the guide portion is also included. ) And spilled oil at the time of injection of engine oil, it is possible to prevent the flow of water or oil to the exhaust manifold side, and it is possible to prevent the generation of white smoke due to oil when the exhaust manifold is hot.

[Brief description of the drawings]

FIG. 1 is a plan view of a cylinder head cover showing an embodiment of the present invention.

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

FIG. 3 is a bottom view of the cylinder head cover.

FIG. 4 is a sectional view taken along line 〓V-〓V of FIG. 3;

FIG. 5 is a front view of the upper cover.

FIG. 6 is a rear view of the upper cover.

FIG. 7 is a right side view of the upper cover.

FIG. 8 is a schematic enlarged view as viewed from arrow V # in FIG.

FIG. 9 is a cross-sectional view taken along line 〓X-〓X in FIG. 6;

FIG. 10 is an enlarged view of a portion indicated by an arrow X in FIG. 9;

FIG. 11 is an enlarged view of a portion taken along the arrow X in FIG. 9;

FIG. 12 is a cross-sectional view taken along line XIII-X} of FIG. 6;

FIG. 13 is an enlarged view of a portion taken along arrow X in FIG. 12;

FIG. 14 is a cross-sectional view taken along line X〓V-X〓V of FIG. 6;

FIG. 15 is a schematic plan view of an upper cover portion of the cylinder head cover.

FIG. 16 is a schematic front view of an upper cover portion of a cylinder head cover.

FIG. 17 is a sectional view taken along line XVＸ-XVＸ in FIG. 1;

FIG. 18 is a sectional view when the cylinder head cover is attached.

FIG. 19 is a plan view of a cylinder head cover showing the first related art of the present invention.

FIG. 20 is a schematic sectional view of a cylinder head and a cylinder head cover.

FIG. 21 is a plan view of a cylinder head cover showing a second prior art of the present invention.

FIG. 22 is a sectional view of the cylinder head cover when the vehicle body is tilted.

FIG. 23 is a plan view of a cylinder head cover showing a third conventional technique of the present invention.

FIG. 24 is a front view of a cylinder head cover.

FIG. 25 is a schematic plan view of an upper cover portion of a cylinder head cover showing a fourth prior art of the present invention.

FIG. 26 is a schematic front view of an upper cover portion of the cylinder head cover.

[Explanation of symbols]

 2 Cylinder head cover 4 Upper cover 6 Breather plate 8 Partition wall 10 Breather chamber 12 Ignition plug hole 14 High tension cord 16 Drain hole 18 Inlet 20 Projection 22 Recess 24 Boss 26 Engine oil inlet 28 Guide 30 Rib for oil separation

Claims (3)

[Claims] 1. A cylinder head cover which is mounted on an upper surface of a cylinder head of an engine and has a breather plate disposed therein to form a breather chamber for separating gas and liquid of oil in the breather chamber. A high tension cord is provided to communicate with the ignition plug mounted in the ignition plug hole and extend to one end of the cylinder head cover, and covers the upper surface of the ignition plug hole and the high tension cord. An upper cover is provided, a drain hole for connecting the vicinity of the ignition plug hole and an outer peripheral portion is provided on the other end side of the cylinder head cover, and the breather chamber extending in a direction crossing the drain hole at a lower portion of the cylinder head cover. So that the inlet of the breather chamber is located near the drain hole in plan view. A drain structure for the cylinder head cover, which is provided. 2. The water of the cylinder head cover according to claim 1, wherein the upper cover is provided with an upwardly projecting protrusion at an end of the extension of the high tension cord. Blanking structure. 3. A cylinder head cover mounted on an upper surface of a cylinder head of an engine and having a breather plate disposed therein to form a breather chamber for separating gas and liquid of oil in the breather chamber. A high tension cord is provided to communicate with the ignition plug mounted in the ignition plug hole and extend to one end of the cylinder head cover, and covers the upper surface of the ignition plug hole and the high tension cord. An upper cover is provided, a water drain hole is provided on the other end side of the cylinder head cover to connect the vicinity of the ignition plug hole and the outer peripheral portion, and an engine oil inlet is provided near the water drain hole, and the engine is mounted. When the exhaust manifold is positioned at the front of the engine and mounted at an angle to the front of the vehicle, The cylinder head cover is characterized in that a guide portion for preventing the flow of water or oil to the exhaust manifold side is integrally provided at a position in front of and below the drain hole portion and the engine oil inlet of the cylinder head cover. Drainage structure.