KR101361571B1 - Ventilation apparatus for cylinder head cover - Google Patents

Abstract

A ventilation apparatus for a cylinder head cover including an oil separator in the cylinder head cover is disclosed. According to the ventilation apparatus for the cylinder head cover comprising the oil separator in the cylinder head cover, the oil separator includes an inflow port and an outflow port for blow by gas; a housing having first and second drain units between the inflow port and the outflow port; a first oil separator which is placed in the housing facing the first drain unit to supply oil to the first drain unit by firstly separating the oil from the blow by gas; a second oil separator which is placed in the housing facing the second drain unit to supply the oil to the second drain unit by secondly separating the oil from the blow by gas. The second oil separator includes a perforated plate having a plurality of air gaps for increasing the flow rate of the blow by gas; and an oil separating barrier which collides with the blow by gas having increased flow rate as passing through the perforated plate.

Description

VENTILATION APPARATUS FOR CYLINDER HEAD COVER}

The present invention relates to a cylinder head cover ventilating apparatus provided in a cylinder head cover of an automobile, and more particularly, to a blow-by of an engine provided in a cylinder head cover. A cylinder head cover ventilating device for separating oil mist in blow-by gas.

In general, the blow-by gas generated in the engine combustion process of the internal combustion engine for automobiles is composed of fine oil particles (ie, oil mist), soot and water vapor. This blow-by gas continuously flows into the combustion chamber through the intake and burns, and thus, the consumption of oil increases in proportion to the generation of blow-by gas.

On the other hand, there is a ventilating device is coupled to the cylinder head to maintain a constant pressure in the engine. This ventilating device serves to allow the blow-by gas generated during combustion to flow into the intake system well. In addition, the periodic volume change caused by the reciprocating rotation of the crank mechanism must be compensated for, and the reciprocating movement of the piston causes high gas velocity in the crankcase. At this time, the blow-by gas contains fine oil and flows through the crankcase, the cylinder head, and the cylinder head cover to the ventilator. The fine oil, that is, the blow-by gas containing the oil mist, contains higher hydrocarbons than the exhaust gas generated in the combustion chamber and enters the combustion chamber to cause incomplete combustion. In addition, the oil mist contained in the blow-by gas is mixed with soot, water vapor, and fuel, and has a viscosity, so that the oil mist is adsorbed to the intake system and the supercharger system and causes deterioration and soot generation.

For this reason, the ventilation apparatus requires the function of separating oil mist in blow by gas. Conventional ventilating devices are configured to rotate the blow-by gas in a whirlwind form inside the oil separator room by means of negative pressure acting on the intake machine, at which time the oil mist in the blow-by gas is separated by centrifugal force. However, this ventilating device has a disadvantage in that the oil separator room is a complicated external structure provided as a separate part from the cylinder head cover. In addition, there is a disadvantage that the blow-by gas leaks from the connection portion of the inlet and outlet ports connecting the cylinder head cover and the oil separator room.

On the other hand, the cylinder head cover ventilation apparatus which integrated the oil separator with the cylinder head cover was proposed conventionally. However, the conventional ventilation apparatus has a disadvantage in that the structure of the oil separation part (s) separating oil in the oil separator is complicated, and also, the oil separation efficiency is low, and thus the amount of oil contained in the blow-by gas is large. I still hold it.

Accordingly, one problem to be solved by the present invention is to provide a cylinder head cover ventilation device having a simple structure of an oil separator provided on a cylinder head cover and high oil separation efficiency by the oil separator.

According to one aspect of the invention there is provided a cylinder head cover ventilating device comprising an oil separator on the cylinder head cover. The oil separator of the cylinder head cover ventilating device includes a housing including an inlet and an outlet of a blow-by gas and having a first drain and a second drain between the inlet and the outlet; A first oil separator provided in the housing so as to correspond to the first drain and separating the oil in the blow-by gas into the first drain; It is provided in the housing to correspond to the second drain portion, and includes a second oil separation unit for separating the oil in the blow-by gas to the second drain portion. The second oil separator includes a porous plate having a plurality of pores formed therein to increase the flow rate of the blow-by gas, and an oil separation barrier that collides with the blow-by gas having an increased flow rate through the porous plate.

According to one embodiment, the plurality of voids may be opened in positions projecting forward and backward from each of the front and rear surfaces of the porous plate.

According to one embodiment, each of the pores is opened in a position protruding the front and rear by the front extension and the rear extension extending from each of the front and rear surfaces of the porous plate, and the front extension and The rear extension may be formed by a separate pipe integrated in the process of forming the porous plate.

According to one embodiment, further comprising a porous fiber member positioned between the porous plate and the oil separation barrier, the porous fiber member may be positioned to be spaced apart from one open end of the void.

According to one embodiment, the oil separation barrier is formed to extend downward from the inner upper surface of the housing with a concave-convex cross section and spaced apart from the bottom of the housing to allow flow of blow-by gas.

According to one embodiment, the first oil separation unit includes a plurality of oil separation pins to form a plurality of flow paths through which the blow-by gas passes, wherein the plurality of oil separation pins are the plurality of oil separation pins Vortex flows through the flow path.

According to an exemplary embodiment, the second drain part may include a backflow preventing member to prevent oil from flowing back through the second drain part by the intake negative pressure of the intake machine.

According to one embodiment, the outlet portion may include an internal extension protruding from the inner side of the housing toward the inside of the housing to block the inflow of oil flowing through the inner wall of the housing.

The cylinder head cover ventilation device according to the present invention has a simple oil separator structure and, despite its simple structure, can efficiently separate coarse oil mist and fine oil mist in blow-by-gas. In addition, the present invention can effectively separate the fine oil mist by the cooperation of the porous plate to increase the flow rate of the blow-by gas and the oil separation barrier with increased flow rate. At this time, since a plurality of pores formed in the porous plate is open at positions extending forward and rearward from the front and rear surfaces of the porous plate, oil can be prevented from flowing unintentionally into the pores. In addition, the oil separation efficiency can be further increased by the porous fiber member located between the porous plate and the oil separation barrier. In addition, an outlet portion through which blow-by gas is discharged may also have an inner extension portion protruding into the housing, thereby preventing oil from flowing into the outlet portion.

1 is a perspective view showing the appearance of a cylinder head cover ventilation apparatus according to an embodiment of the present invention;
FIG. 2 is a longitudinal sectional view showing an oil separator of the cylinder head cover ventilation apparatus shown in FIG. 1;
3 is a perspective view of the oil separator shown in FIG. 2 with the bottom plate of the housing removed;
4 is a perspective view of the oil separator shown in FIGS. 2 and 3 with the cover casing of the housing removed;
5 is a perspective view showing the second oil separator of the oil separator from an upstream side of the blow-by gas flow;
FIG. 6 is a perspective view showing the second oil separator of the oil separator from the downstream side of the blow-by gas flow; FIG.
FIG. 7 is an enlarged perspective view illustrating an enlarged view of the second oil separation unit illustrated in FIG. 3 to show a structure of an oil separation barrier of the second oil separation unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples for allowing a person skilled in the art to sufficiently convey the idea of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the width, length, thickness, and the like of the components may be exaggerated for convenience.

1 is a perspective view showing the appearance of the cylinder head cover ventilating device according to an embodiment of the present invention, Figure 2 is a longitudinal cross-sectional view showing an oil separator of the cylinder head cover ventilating device shown in Figure 1, Figure 3 2 is a perspective view of the oil separator illustrated in FIG. 2 with the bottom plate removed, and FIG. 4 is a perspective view of the oil separator illustrated in FIGS. 2 and 3 with the cover casing removed. 5 is a perspective view showing the second oil separator of the oil separator from the upstream side of the blow-by gas flow, FIG. 6 is a perspective view showing the second oil separator of the oil separator from the downstream side of the blow-by gas flow, and FIG. 3 is an enlarged perspective view illustrating an enlarged view of the second oil separator shown in FIG. 3 to show the structure of the oil separation barrier of the second oil separator.

First, referring to FIG. 1, one can see a portion of a cylinder head 3 and a cylinder head cover 2 coupled thereon. The cylinder head cover ventilation device according to an embodiment of the present invention includes two oil separators 1, 1 ′ provided on the cylinder head cover 2. The oil separators 1 and 1 'are configured to separate oil mist in blow-by gas generated inside the engine of the vehicle and to supply it into the combustion chamber. One oil separator 1 of the two oil separators 1, 1 'is an oil separator in a full load region, and the other oil separator 1' is an oil separator in a partial load region.

Each of the oil separators 1, 1 ′ includes separator housings 10, 10 ′, and the separator housings 10, 10 ′ and the elements that allow the flow of blow-by gas and the blow-by gas therein. Elements for separating the oil mist are provided. Hereinafter, the oil separator of the cylinder head cover ventilation device will be described in more detail. In order to avoid duplication of explanation, the full load region separator 1 will be mainly described.

As illustrated in FIGS. 2 to 4, the oil separator 1 may include a housing 10, a first oil separator 20 and a second oil separator 30 installed in the housing 10. Include. The first oil separator 20 separates a relatively large particle of oil mist (hereinafter, referred to as a "coarse oil mist") from the blow-by gas, and the second oil separator 30 is a relatively small particle. Separate the oil mist (hereinafter referred to as "fine oil mist").

The housing 10 consists of a cover casing 10a and a bottom plate 10b. In this embodiment, the bottom plate 10b is provided separately from the cylinder head cover 2. However, since the cover casing 10a is directly coupled to the cylinder head cover 2 (see FIG. 1), the cylinder head cover 2 may take the role of the bottom plate 10b, in which case, The cylinder head cover 2 is defined as the bottom (or bottom plate) of the housing 10.

An inlet portion 11 through which blow-by gas flows is formed in one bottom plate 10b of the housing 10, and an outlet through which blow-by gas exits the other side of the housing 10 and a side of the cover casing 10a. The part 12 is formed.

In relation to the inlet 11, an inlet guide 112 and a barrier-type guide 114 are formed in the bottom plate 10b of the housing 10. The inlet guide 112 covers the upper portion of the inlet portion 11 and has a structure in which side surfaces are open in all directions. The barrier guide 114 is located in front of the inlet guide 112. The inlet guide 112 and the barrier guide 114 efficiently guide the blow-by gas introduced through the inlet 11 toward the first oil separator 20.

The outlet portion 12 includes an inner extension portion 122 protruding in a flange shape from the inner side of the housing 10, thereby not only outward of the housing 10 but also inward of the housing 10. It protrudes. The inner extension 122 prevents oil from flowing into the outlet 12 along the inner wall of the housing 10, which minimizes the possibility of oil being contained back into the blow-by gas and drained out. Let it be.

In the case where it is difficult to form the inner extension 122 by injection molding the cover casing 10a of the housing 10, a pipe casing is placed on a mold and then a cover casing that is a part of the housing 10 ( By injection molding 10a) integrally with the star, the above-described internal extension 122 can be preferably formed.

In addition, the bottom plate 10b of the housing 10 includes a first drain portion 40 for discharging the oil separated by the first oil separator 20 and the second oil separator 30 to the cylinder head. The second drain part 50 is formed. At this time, the second drain portion 50 is provided with a backflow prevention member 52, the backflow prevention member 52 is the oil flow back through the second drain portion 50 by a sudden intake negative pressure of the intake machine To prevent it from being sucked out. In addition, the bottom plate 10b has a funnel-shaped first drain inducing portion 41 converging toward the first drain portion 40 and a funnel-shaped second drain inducing portion converging toward the second drain portion 50. 51 is formed.

The first drain induction part 41 covers the installation area of the first oil separation part 30 and is inclined downward from the second oil separation part 30 to the first drain part 40. have. In addition, the second drain induction part 51 is inclined downward from the second oil separation part 30 to the second drain part 50 on one side, and from the vicinity of the outlet part 12 on the other side. The second drain 50 is inclined downward.

The first oil separator 20 is provided in a region immediately above the first drain portion 40 for separating oil mist of a relatively large particle, that is, coarse oil mist, and arranged in a spaced apart state. Oil separating fins 22. The oil separation fins form a plurality of flow paths through which the blow-by gas passes, and at the same time, cause the blow-by gas to vortex while passing through the plurality of flow paths. In addition, the blow-by gas flowing while causing vortex collides frequently with the oil separation pins 22, and in the process, the oil mist in the blow-by gas is separated. To assist in the formation of the vortex, each of the oil separation pins 22 is integrally provided with curved branches or extensions 222. In this case, the oil separation pins 22 may be integrally formed on the inner upper surface of the cover casing 10a.

The second oil separator 30 is located between the first oil separator 20 and the outlet 12 in order to separate relatively small particles of oil mist, that is, fine oil mist. In addition, the second drain part 50 is located at the rear side of the second oil separator 30, and the oil of the fine particles separated from the second oil separator 20 is the second drain induction part 51 described above. ) Is sent to the second drain portion 50, and the discharge oil is recovered to the cylinder head side through the second drain portion 50.

 The second oil separator 30 is installed to cover the flow path of the blow by gas, and includes a porous plate 32 and an oil separation barrier 34 along the flow direction of the blow by gas. In addition, a porous fiber member 33 may be further installed between the porous plate 32 and the oil separation barrier 34 to further increase oil separation efficiency.

The porous plate 32 is formed to have a plurality of voids 322, each of the plurality of voids 322 acts as a flow path of the blow-by gas, while minimizing the cross-sectional area of the flow-by-gas rapidly increases the flow rate of the blow-by gas It plays a role. As the blow-by gas with a sharply increased flow rate impinges on the oil separation barrier 34, oil mist of fine particles in the blow-by gas can be separated from the blow-by gas. The porous fiber member 33 is made of fleece or synthetic fiber, and helps the porous plate 32 and the oil separation barrier 34 to increase oil separation efficiency.

As best shown in FIGS. 5 and 6, the pores 322 of the perforated plate 32 are each secured by the front and rear extensions extending forward and backward in the form of a flange. It is open at positions projecting forward and backward from the rear face. This prevents oil from flowing into the void 322 along the front and rear walls of the porous plate 32 due to the high flow rate of blow by gas.

In order to make the structure of the porous plate 32 as described above, in this embodiment, the pipe 321 is integrated into the porous plate 32 in a shape that penetrates the porous plate 32, whereby A front extension and a rear extension of the void 322 are formed. The porous plate 32 having the pipe 321 integrally may be formed by various methods, but in this embodiment, a plurality of separate pipes 321 are prepared in advance, and the porous plate 32 is prepared. In injection molding, a manner of integrating the star pipe 321 with the porous plate 32 may be advantageously applied. By adjusting the number of voids 322 of the porous plate 32 and the length of the rear extension and the length of the front extension of the voids 322 formed by the pipe 321, it is possible to increase efficiency and reduce pressure loss. It is possible to optimize the structure.

On the other hand, the porous fiber member 33, once installed can be used without replacement, is disposed so as to be spaced apart from the open end of the porous plate 32, in particular, the void 322. When the porous fiber member 33 is old, the pores of the porous fiber member 33 may be blocked to prevent the flow of the blow-by gas. In this case, when one open end of the pore 322 is spaced apart from the porous fiber member 33, a blow-by gas may bypass the porous fiber member 33 and reach the separation barrier 34.

In addition, the oil separation barrier 34 extends downward from the inner top surface of the housing 10, as shown in FIG. 2, but is spaced apart from the bottom of the housing 10 to form a gap. Blow through gas may continue to flow toward the outlet 12 through the gap. The oil barrier 34 preferably has a concave-convex cross section, as shown in FIG. 7, to increase the impact surface area with the blow-by gas. The convex portion 342 and the concave portion 344 of the unevenness are preferably continuously connected in the vertical direction.

1, 1 ': oil separator 2: cylinder head cover
10, 10 ': housing 11: inlet
12: outlet 20: first oil separator
22: oil separation pin 30: second oil separation portion
32: porous plate 33: porous fiber member
34: oil separation barrier 40: first drain portion
41: first drain induction part 50: second drain part
51: second drain induction part 52: backflow prevention member
122: internal extension 321: pipe
322: void

Claims (8)

A cylinder head cover ventilating device comprising an oil separator on a cylinder head cover, wherein the oil separator comprises:
And a first drain portion 40 and a second drain portion 50 formed between the inlet portion 11 and the outlet portion 12 of the blow-by gas. A housing 10;
A first oil separation part 20 provided in the housing 10 to correspond to the first drain part 40 and separating oil in blow-by-gas primarily and sending it to the first drain part 40;
It is provided in the housing 10 to correspond to the second drain portion 50, and includes a second oil separation portion 30 to separate the oil in the blow-by gas to the second drain portion 50 ,
The second oil separator 30 collides with the porous plate 32 having a plurality of voids 322 to increase the flow rate of the blow-by gas, and the blow-by gas having an increased flow rate through the porous plate 32. Including an oil separation barrier 34,
The oil separation barrier 34 has a concave-convex cross section and is formed to extend downward from an inner upper surface of the housing 10, and is spaced apart from the bottom of the housing 10 to allow the flow of blow-by gas. Cylinder head cover ventilating device. The cylinder head cover ventilating device according to claim 1, wherein the plurality of voids (322) are open at positions projecting forward and backward from each of the front and rear surfaces of the porous plate (32). The method of claim 2, wherein each of the pores 322 is opened in the front and rear positions projected by the front and rear extensions extending from each of the front and rear surfaces of the porous plate 32, And the front extension part and the rear extension part are formed by a separate pipe 321 integrated in the process of forming the porous plate. The method of claim 1, further comprising a porous fiber member 33 positioned between the porous plate 32 and the oil separation barrier 34, the porous fiber member 33 is open to one side of the void 322 Cylinder head cover ventilating device, characterized in that positioned so as to be spaced apart from the stage. delete The method of claim 1, wherein the first oil separation unit 20 includes a plurality of oil separation pins 22 to form a plurality of flow paths through which the blow-by gas passes, the plurality of oil separation pins 22 The cylinder head cover ventilation apparatus, characterized in that for generating a vortex in the course of the blow-by gas passing through the plurality of flow paths. The method of claim 1, wherein the second drain portion 50 is provided with a backflow preventing member 52 to prevent oil from flowing back through the second drain portion 50 by the intake negative pressure of the intake machine. Cylinder head cover ventilating device characterized in that. The method of claim 1, wherein the outlet portion 12 includes an internal extension 122 protruding from the inner side of the housing toward the inside of the housing to block the inflow of oil flowing through the inner wall of the housing. Cylinder head cover ventilating device, characterized in that.

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