KR20130107785A - A cylinder head cover for internal combustion engine - Google Patents

Abstract

PURPOSE: A cylinder head cover for an internal combustion engine is provided to separate oil from blow-by gas because the blow-by gas flowing upward from a cylinder head into a cover is collided to the bottom of a cap and an oil blocking plate. CONSTITUTION: A cylinder head cover (1) for an internal combustion engine has an opening (10) arranged in one side of the top of the cover. The opening is opened and closed by a cap (12). An exhaust path (14) for exhausting blow-by gas is formed at the center of the opening by multiple plate-shaped ribs (13) straightly stretched from the cover. An inlet of the exhaust path faces the bottom of the cap. The blow-by gas flowing upward from a cylinder head into the cover flows toward the inlet of the exhaust path after being collided to the bottom of the cap to change the flowing direction.

Description

A cylinder head cover for internal combustion engine

The present invention relates to a cover for covering a cylinder head of a vehicle engine, that is, an internal combustion engine. Specifically, the gas and oil are separated from the blow-by gas in which the explosion gas and the engine oil are formed inside the engine, and the intake pressure is increased. Regardless of, the present invention relates to a cylinder head cover of an internal combustion engine having a structure capable of maintaining a constant pressure inside a cylinder block.

In the case of an engine which is an internal combustion engine, a small amount of mixed gas leaks through a small gap between the cylinder wall and the piston during compression and explosion stroke. This phenomenon is generally called a blow by phenomenon, and the leaked mixed gas is called a blow by gas. Since the gap between the cylinder wall and the piston cannot be eliminated for the movement of the piston, the blow-by phenomenon is inevitable in the internal combustion engine.

Although the piston ring and the engine oil have a sealing function that minimizes the gap between the cylinder wall and the piston, the engine oil has a low viscosity over time and flows down without sticking to the cylinder wall. There are also gaps in the surface. In addition, as the foreign matter including fine dust particles passing through the air filter wears off the piston ring or the cylinder wall, the blow-by phenomenon may be accelerated by the gap.

Blow-by gas is called crankcase emission in other words. The main component of the blow-by gas is unburned fuel (HC), and the remainder is composed of partially oxidized mixed gas and engine oil. When the blow-by gas stays in the crankcase, the engine is corroded and the cylinder internal pressure is excessively increased, which causes a serious problem that the engine oil is rapidly reduced.

In order to solve the problems caused by the above blow-by gas, a recirculation structure that bypasses the blow-by gas generated in the cylinder to an intake machine, for example, an intake manifold, is widely adopted. At this time, in the middle of the bypass path for bypassing the blow-by gas to the intake machine side, a reducing device is provided for separating oil components included in the blow-by gas and preventing sudden negative pressure of the crankcase.

Conventional blow-by gas reduction apparatuses generally include an oil separator (separating oil component and gas component from blow-by gas), for example, a sieve and a crankcase at the moment the blow-by gas exits the cylinder. And negative pressure preventing means (for example, configured as a check valve by a spring and a thin rubber film having elasticity in a direction against blow-by gas) to prevent rapid negative pressure formation.

In order to reduce the blow-by gas as described above, a separate oil separation means such as an oil separator for separating / recovering oil components contained in the blow-by gas and a negative pressure prevention such as a blow-by bypass valve to prevent the negative pressure Means apply. However, due to the application of oil separation means or negative pressure preventing means, there is a problem in that the number of parts increases and manufacturing costs increase in implementing the blow-by gas recirculation structure.

Republic of Korea Patent Publication No. 2010-0061200

The technical problem to be solved by the present invention is to provide a cylinder head cover structure that can implement the separation of gas and engine oil from blow by gas without applying a separate oil separation means such as a strainer will be.

Another technical problem to be solved by the present invention is to provide a cylinder head cover structure that can maintain a constant pressure inside the cylinder regardless of the strength of the suction pressure without applying a separate negative pressure prevention means made of a spring and a rubber membrane It is to provide.

As a means for solving the problem, the present invention is a cylinder head cover covering the upper portion of the internal combustion engine cylinder head, has an opening on one side of the upper surface of the cover, the opening is open and closed by a cap, a plurality of plate-like extending integrally from the cover In the center of the opening through the ribs is formed integrally with the discharge passage for forming the discharge path of the blow-by gas, the discharge passage flows from the cylinder head, the inlet is disposed facing the bottom of the cap and flows upward from the inside of the cover The bi-gas is provided with a cylinder head cover of the internal combustion engine, characterized in that the impingement of the flow toward the discharge passage inlet by impacting the bottom of the cap.

In the embodiment of the present invention, the plate-shaped oil-proof plate is coupled to the inside of the cover spaced apart from the opening which can be opened and closed by the cap. Can be.

At this time, the oil prevention plate may be fixed to the end of the reinforcing ribs protruding in a predetermined pattern on the inner wall of the cover, and has an inclined oil path for inducing the separated and collected oil in the center to flow back to the crankcase. It may be a configuration.

In the exemplary embodiment of the present invention, the reinforcing ribs may be arranged in a left and right alternating manner at regular intervals, and thus the blow-by gas is closed by a cap while having a zigzag flow in the blow-by gas circulation passage. Flow toward the opening side.

In addition, the discharge passage applied in the present embodiment, a horizontal passage having a vertical passage formed with the inlet disposed facing the bottom surface of the cap and an outlet extending perpendicularly from the vertical passage toward the side of the cover and exposed to the outside. It may be composed of.

In another embodiment, another horizontal passage facing the side of the cover may be further formed opposite the horizontal passage.

According to the cylinder head cover of the internal combustion engine according to an aspect of the present invention, the blow-by gas flows out of the cylinder head and flows upward from the inside of the cover impinges on the oil prevention plate and the bottom of the cap in two stages so that the oil component is contained in the gas. This is a structure that can be separated. Therefore, it is possible to enhance the collection function of the oil component contained in the blow-by gas without applying a separate oil separation means as in the prior art.

In addition, the path where the blow-by gas is discharged forms a zigzag refraction path that can prevent the smooth flow of the blow-by gas rather than a straight section, thereby reducing the pressure and flow rate of the blow-by gas discharged out of the cylinder cover as much as possible. Can be. Therefore, the pressure inside the cylinder can be kept constant without applying a negative pressure preventing device, which is composed of a spring and a rubber plate.

In conclusion, the present invention, by changing the structure and shape of the cylinder head cover to enhance the capture function of the oil component from the blow-by gas (blow by gas) without applying the existing oil separation means or negative pressure prevention means, constant pressure In this way, the number of parts can be drastically reduced in implementing the apparatus for the blow-by gas treatment, and the cost can be greatly reduced by removing the parts.

1 is a perspective view of a cylinder head cover of an internal combustion engine according to an embodiment of the present invention with the cap removed.
Figure 2 is an enlarged perspective view of the main portion of the main portion of the present invention with the cap removed.
Figure 3 is a cross-sectional view of the cylinder head cover according to Figure 1 in the AA line direction with the cap coupled.
4 is a cross-sectional view of the cylinder head cover according to FIG. 1 in a BB line direction with a cap coupled thereto;
Figure 5 is a longitudinal cross-sectional view of the cylinder head cover according to another embodiment of the present invention.
6 is a bottom view of the cylinder head cover of the internal combustion engine according to the embodiment of the present invention in a state where the oil barrier plate is removed.
Figure 7 is a bottom view of the cylinder head cover of the internal combustion engine according to an embodiment of the present invention in the state in which the oil prevention plate is coupled.
Figure 8 is an operating state showing the state that the blow-by gas is discharged out of the cover via the cylinder head cover according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, a detailed description of known configurations will be omitted, and a detailed description of configurations that may unnecessarily obscure the gist of the present invention will be omitted.

1 is a perspective view of a cylinder head cover of an internal combustion engine according to an embodiment of the present invention with the cap removed, and FIG. 2 is an enlarged perspective view of a main part according to FIG. 1. 3 and 4 show side cross-sectional views of the cylinder head cover shown in FIG. 1 as viewed from the A-A and B-B lines, respectively, with the caps coupled thereto.

1 to 4, the present invention is an internal combustion engine, that is, a cylinder head cover that covers the upper part of the engine, protrudes convex upwards and has a space for the sound absorption and blow-by gas flow therein, A flange 11 is provided with bolt heads for assembling the cylinder head at predetermined intervals along the outer edge. The cylinder head cover can be manufactured by injection molding a synthetic resin material having excellent heat resistance and chemical resistance.

 The cylinder head cover 1 according to the embodiment of the present invention has an opening 10 at one side of its upper surface. The opening 10 may be a large diameter hole vertically drilled from the inside of the cover to the outside as shown in the figure, and may be opened or closed by a cap 12 having a size that can cover the opening. In this case, the cap 12 may be detachably coupled to the fastening means such as a bolt as shown in the figure, but not shown to cover the opening 10 by a screw fastening method to a fastening surface around the opening 10.

At the center of the opening 10 is a discharge passage 14 which forms a path through which blow-by gas discharged from the cylinder can be discharged. The discharge passage 14 is integrally formed at the center of the opening 10 such that the inlet I is disposed to face the bottom surface of the cap 12 via a plurality of plate-shaped ribs 13 extending integrally from the cover. By forming at least a smaller diameter than the opening 10, the passage P is secured between the outer diameter of the hole partitioning the opening 10 and the discharge passage 14.

Therefore, the blow-by gas flowing out of the crankcase and flowing in the space inside the cover flows toward the bottom of the cap 12 through the passage P, collides with the bottom of the cap 12, and then changes direction to the discharge passage ( 14) it has a flow towards the inlet (I). At this time, due to the collision with the bottom surface of the cap 12, the flow rate and pressure is reduced, the oil component mixed into the blow-by gas is collected and collected, and only the lighter gas component is discharged out of the cover through the discharge passage 14.

A plate-shaped oil-proof plate 15 is installed inside the cover at a position spaced downward from the opening 10 which can be opened and closed by the cap 12. As a result, a circulation passage 17 may be formed between the upper inner surface of the cover and the oil barrier plate 15 so that the blow-by gas may flow toward the opening 10 closed by the cap 12. The oil prevention plate 15 may be attached and fixed to the end of the reinforcing rib 18 protruding in a predetermined pattern on the inner wall of the cover through a fastening member such as a bolt.

The oil path 16 inclined in one direction is formed at the center of the oil prevention plate 15. At this time, the oil path 16 collects the separated and collected oil in one place and functions to guide the flow back to the crankcase. 2 illustrates an oil path 16 having a 'U'-shaped cross section, but is not limited thereto. The structure may collect oil condensed on the oil barrier plate 15 into one place and return it to the crankcase side. If it is me shape, there is no special limitation.

6 is a bottom view of a cylinder head cover of an internal combustion engine according to an embodiment of the present invention in a state in which an oil barrier plate is removed, and FIG. 7 is an internal combustion in accordance with an embodiment of the present invention in a state in which an oil prevention plate is combined. Bottom view of the cylinder head cover of an engine.

6 to 7, the reinforcing ribs 18 for installing the oil barrier plate 15 are formed to form a pattern arranged at left and right sides at regular intervals. Therefore, when the oil barrier plate 15 is coupled to the reinforcing rib 18, the blow-by gas circulation passage 17 partitioned therebetween is formed in a path of a continuously refracted pattern in a zigzag form, and the blow-by gas is zigzag along it. It has a flow of form and flows toward the opening 10 which is closed by the cap 12.

When the path of the blow-by gas is formed as a zigzag refraction path that can prevent the smooth flow of the blow-by gas rather than a straight section, the pressure, flow rate and By lowering the temperature as much as possible, it is possible to collect the oil contained in the blow-by gas as much as possible through condensation, and at the same time, maintain the pressure inside the cylinder without a separate negative pressure preventing means.

In the drawings, the configuration in which the reinforcing ribs 18 are arranged alternately left and right to form the circulation passage 17 in a zigzag form is illustrated and described as an example, but it is not limited thereto. In other words, if it is a shape or structure capable of expressing the above actions and effects by maximally interrupting the flow in discharging the blow-by gas, all the examples that can be changed are also included in the scope of the embodiment of the present invention.

On the other hand, the discharge passage 14 extends perpendicularly from the vertical passage 14a toward the side of the cover and the vertical passage 14a forming the inlet I disposed to face the bottom surface of the cap 12. It may be a bent configuration consisting of a horizontal passage 14b having an outlet exposed to the outside. As such, when the discharge passage 14 also forms a bent shape instead of a straight section, the pressure, flow rate, and temperature of the blow-by gas discharged can be further lowered, thereby improving oil separation / capture rate and preventing negative pressure formation as much as possible. have.

5 is a longitudinal sectional view of the cylinder head cover according to another embodiment of the present invention, and is perpendicular to the side of the cover from the vertical passage 14a of the two passages constituting the discharge passage 14 in one embodiment. By forming another horizontal passage 14b facing the side of the cover on the opposite side of the horizontal passage 14b having an outlet extending outwardly to the outside, the blow-by gas is discharged to the outside through both sides of the cylinder head cover. You may.

More specifically in connection with the blow-by gas flow in the cylinder head cover with respect to the action of preventing oil separation and negative pressure formation for the blow-by gas performed by the cylinder head cover according to the present invention having the above-described configuration Let's look at it.

8 is an operating state diagram showing a state in which the blow-by gas is discharged to the outside of the cover through the cylinder head cover according to an embodiment of the present invention.

Referring to FIGS. 7 and 8, the blow-by gas flowing in the crankcase toward the cylinder head cover is naturally formed between the upper surface of the cylinder head cover and the oil prevention plate 15 due to the difference in pressure and temperature. The gas flows into the bi-gas circulation passage 17. And it flows toward the opening 10 sealed by the cap 12 along the blow-by gas circulation path 17 of the continuous refracted pattern in a zigzag form.

At this time, the blow-by gas collides with the reinforcing rib 18 which divides the circulation passage 17 in a zigzag form while flowing the circulation passage 17, thereby reducing the pressure, the flow rate, and the temperature, and thus condensation occurs. The oil component contained in the gas is primarily separated. The separated oil component is collected in the inclined oil path 16 formed in the center of the oil barrier plate 15 and flows back to the crankcase side.

The blow-by gas in which the oil component is first separated while passing through the circulation passage 17 continues to flow upward toward the opening 10, which is closed by the cap 12 of the cylinder head cover, and the cap 12. After colliding with the bottom, the direction is changed to have a flow toward the inlet I of the discharge passage 14. In this process, the flow rate, pressure, and temperature of the blow-by gas are further reduced due to the collision with the bottom of the cap 12, so that a sudden negative pressure is prevented and the oil component mixed into the blow-by gas is separated once again.

The blow-by gas which has undergone the separation of the oil components in the first and second stages is finally discharged out of the cylinder head cover 1 according to the present invention via the discharge passage 14 which is bent in a 'b' shape. It is returned to an intake machine, for example, an intake manifold, through a bypass hose (not shown) extending from the outlet side, which is then introduced to the engine side and reburned in the engine.

According to the cylinder head cover of the internal combustion engine according to the present invention, the blow-by gas flowing out of the cylinder head and upwardly flows inside the cover impinges the oil prevention plate and the bottom of the cap in two stages so that It is a structure that can be separated. Therefore, it is possible to enhance the collection function of the oil component contained in the blow-by gas without applying a separate oil separation means as in the prior art.

In addition, the path where the blow-by gas is discharged forms a zigzag refraction path that can prevent the smooth flow of the blow-by gas rather than a straight section, thereby reducing the pressure and flow rate of the blow-by gas discharged out of the cylinder cover as much as possible. Can be. Therefore, the pressure inside the cylinder can be kept constant without applying a negative pressure preventing device, which is composed of a spring and a rubber plate.

In conclusion, the present invention, by changing the structure and shape of the cylinder head cover to enhance the capture function of the oil component from the blow-by gas (blow by gas) without applying the existing oil separation means or negative pressure prevention means, constant pressure In this way, the number of parts can be drastically reduced in implementing the apparatus for the blow-by gas treatment, and the cost can be greatly reduced by removing the parts.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

Claims (6)

Cylinder head cover that covers the upper part of the cylinder head of the internal combustion engine,
Has an opening on one side of the upper surface of the cover,
The opening can be opened and closed by a cap,
Discharge passages are formed integrally at the center of the opening through a plurality of plate-shaped ribs extending integrally from the cover to form a discharge path of the blow-by gas.
The outlet passage is disposed facing the bottom of the cap so that the blow-by gas flowing out of the cylinder head and flowing upward from the inside of the cover collides with the bottom of the cap, and then turns to achieve a flow toward the outlet passage inlet. A cylinder head cover of an internal combustion engine.
The method of claim 1,
An inner combustion engine is characterized in that a plate-shaped oil prevention plate is coupled to the inside of the cover spaced apart from the opening which can be opened and closed by a cap, so that a blow-by gas circulation path is formed between the upper surface of the cover and the oil prevention plate. Cylinder head cover.
The method of claim 1,
The oil prevention plate is attached to and fixed to the end of the reinforcing ribs protruding in a predetermined pattern on the inner wall of the cover, and in the center thereof, the oil prevention plate has an inclined oil path for inducing the separated and collected oil to flow back to the crankcase. Cylinder head cover of internal combustion engine.
The method of claim 3, wherein
The reinforcing ribs are arranged in alternating left and right directions at regular intervals, and the blow-by gas flows toward the opening side with a zigzag-shaped flow in the blow-by gas circulation passage. Cylinder head cover.
The method of claim 1,
The discharge passage
A vertical passage defining the inlet disposed facing the bottom of the cap,
The cylinder head cover of the internal combustion engine, characterized in that consisting of a horizontal passage extending from the vertical passage toward the side of the cover at a right angle to the outside.
The method of claim 1,
The cylinder head cover of the internal combustion engine, characterized in that the other horizontal passage further formed toward the side of the cover on the opposite side of the horizontal passage.

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