KR20230003749A - Ventilation structure of internal combustion engine - Google Patents

Abstract

The present invention relates to a ventilation structure of a vehicle internal combustion engine, which improves engine performance. According to the present invention, a first ventilation unit for discharging blow-by gas to an air-cleaner through a breather nipple during full load of an engine is formed. Moreover, a second ventilation unit for discharging blow-by gas to an intake manifold through a PCV valve during part load of the engine is formed.

Description

Ventilation structure of internal combustion engine of vehicle {VENTILATION STRUCTURE OF INTERNAL COMBUSTION ENGINE}

The present invention relates to a ventilation structure of an internal combustion engine of a vehicle, and more particularly, to prevent a blow-by gas discharged from an internal combustion engine from being reversed and excessively flowing into the engine, and at the same time to prevent a certain amount of fresh air from flowing through an air freshener inlet hole. The present invention relates to a ventilation structure of a vehicle internal combustion engine capable of solving the problem of leakage of joints and seals caused by reverse flow pressure and improving engine performance by adjusting the pressure inside the engine compartment to an appropriate level.

The ventilation structure of the vehicle's internal combustion engine discharges blow-by gas to the air-cleaner through the breather nipple during full load according to the degree of engine load. . Oil particles are separated from the blowby gas introduced into the air cleaner, and the separated oil particles can be recycled to the combustion chamber as unburned fuel.

Also, in the case of a partial load of the engine, the blowby gas is discharged to the intake manifold through the PCV valve.

Here, the blowby gas is a gas generated when gas generated in a cylinder when the engine is operated flows into the crankcase and is combined with oil in the crankcase.

The components of blow-by gas are air, oil, fuel, combustion gas, soot generated during combustion, water, etc., and engine performance can be adjusted by adjusting the amount of blow-by gas.

Meanwhile, the blowby gas is discharged by the negative pressure of the engine, but in the case of partial load, the blowby gas flows backward through a breather nipple used as an outlet during full load. The reverse flow of the blowby gas has a direct effect on the flow rate flowing into the engine, thereby deteriorating the performance of the engine.

On the other hand, a vehicle driven by an engine, which is an internal combustion engine, is equipped with various types of valve devices inside. It is configured to distribute, control or regulate the flow of any kind of fluid.

Among these valve devices, a valve device capable of controlling the flow path of fluid in one direction is called a PCV (one-way) valve device. by Gas) can be used to circulate a certain amount of flow to the intake manifold.

On the other hand, a general PCV valve device is generally mounted on the outside of the engine cover. An icing phenomenon in which moisture present in blow-by gas is frozen due to a difference between ambient temperature and internal temperature may occur in the valve mounted on the outside.

The occurrence of icing inside the valve is a cause of valve clogging, and various durability problems such as deterioration in engine performance and deterioration in airtight performance of the engine cover due to an increase in internal pressure occur.

Japanese Unexamined Patent Publication No. 2006-250080 Korean Registered Patent Publication No. 10-1601420 Korean Patent Publication No. 10-2012-0043458 Korean Patent Publication No. 10-2011-0009368

The present invention has been made in view of the above problems, and prevents the generation of static pressure due to the reverse flow of the blowby gas discharged from the internal combustion engine and excessive inflow into the engine, while preventing the inflow of a certain amount of new air freshener through the fresh air inlet hole. Its purpose is to provide a ventilation structure of a vehicle internal combustion engine that can solve the problem of junction and seal leakage caused by reverse flow pressure and improve the performance of the engine by adjusting the pressure inside the engine compartment to an appropriate level.

Another object of the present invention is to adjust the relative pressure inside the engine room through a simple method of adjusting the size of the fresh air intake hole.

Another object of the present invention is to improve the performance of the engine by preventing the occurrence of icing due to a difference with the outside temperature by installing the PCV valve inside the engine cover.

Another object of the present invention is to prevent a vehicle accident due to a follow-up cause by preventing a user from arbitrarily removing a PCV valve.

Another object of the present invention is to divide the internal space of the engine cover and integrally form the branch flow path of the blow-by gas discharged to the intake manifold side through the PCV valve, so that the appearance of the engine room is beautiful, and the branch flow path is It is to ensure stable distribution to the manifold of the manifold as the area is enlarged by utilizing the internal space of the engine cover.

According to one aspect of the present invention, the inner space of the engine cover is partitioned in the longitudinal direction to form two independent spaces, and when the engine is fully loaded in one of the independent spaces, the air cleaner is removed through the breather nipple. It forms a first ventilation part that discharges blow-by gas as an air-cleaner, and when the engine is part-loaded in an independent space on the other side, the intake manifold through the PCV valve ( In the ventilation structure of a vehicle internal combustion engine forming a second ventilation unit for discharging blow-by gas to the intake manifold,

The first ventilation unit may include a valve cover that forms a breather nipple protruding from one end of the engine cover in the longitudinal direction and is coupled to the engine cover so that the breather nipple covers an inlet inside the engine cover to be sealed; a valve center groove formed by recessing the bottom of the valve cover to a predetermined depth; porous exhaust holes concentrically formed around the valve center groove; a plate-shaped valve plate installed above the exhaust hole to open and close the exhaust hole to prevent back flow of blow-by gas into the engine cover; a valve shaft extending from the lower portion of the engine cover, penetrating the center of the valve plate, and allowing the penetrating end to enter the valve center groove, thereby guiding the valve plate to move freely; A pressure control chamber consisting of a new inlet hole formed by drilling a hole in the valve cover at a position away from the exhaust hole of the valve cover to form a bypass flow path so that the fresh air flowing from the air cleaner side flows into the engine cover by a limited amount, , A blow-by gas inlet 1 through which blow-by gas flows from the engine is formed on the other side of the engine cover opposite to the pressure control chamber, and the blow-by gas is guided from the blow-by gas inlet 1 to the pressure control chamber to guide the movement of the blow-by gas. A ventilation structure of a vehicle internal combustion engine forming the gas flow path 1 may be provided.

According to another aspect of the present invention, the inner space of the engine cover is partitioned in the longitudinal direction to form two independent spaces, and when the engine is fully loaded in one of the independent spaces, the air cleaner is removed through the breather nipple. It forms a first ventilation part that discharges blow-by gas as an air-cleaner, and when the engine is part-loaded in an independent space on the other side, the intake manifold through the PCV valve ( In the ventilation structure of a vehicle internal combustion engine forming a second ventilation unit for discharging blow-by gas to the intake manifold,

The second ventilation unit may include a built-in PCV valve installed inside the engine cover; a PCV installation block for coupling the built-in PCV valve to be installed on an inner wall of an engine cover; Separating walls extending and coupled to both sides of the PCV installation block to form respective passages by dividing the second ventilation unit up and down in the longitudinal direction from the PCV installation block as a starting point; a blow-by gas inlet 2 formed on the engine cover opposite to the built-in PCV valve and through which blow-by gas flows from the engine; a blow-by gas inlet 2 provided in the lower space of the partition wall to communicate with the blow-by gas inlet side of the built-in PCV valve from the blow-by gas inlet 2 to guide the movement of the blow-by gas; a blow-by gas distribution passage provided in the upper space of the partition wall to communicate with the blow-by gas discharge side of the built-in PCV valve; and an exhaust unit communicating with the blow-by gas distribution passage to discharge and connect the blow-by gas to the intake manifold.

According to another aspect of the present invention, the inner space of the engine cover is partitioned in the longitudinal direction to form two independent spaces, and when the engine is fully loaded in any one of the independent spaces, air is released through the breather nipple. It forms a first ventilation part that discharges blow-by gas with an air-cleaner, and when the engine is part-loaded in an independent space on the other side, the intake manifold through the PCV valve In the ventilation structure of a vehicle internal combustion engine forming a second ventilation unit for discharging blow-by gas to an intake manifold,

The first ventilation unit may include a breather nipple protruding from one end of the engine cover in the longitudinal direction; a valve cover coupled to the engine cover to form a pressure control chamber so as to seal an inlet of the engine cover of the breather nipple; a valve center groove formed by recessing the bottom of the valve cover to a predetermined depth; porous exhaust holes concentrically formed around the valve center groove; a plate-shaped valve plate installed to open and close the exhaust hole at an upper side of the exhaust hole; a valve shaft extending under the engine cover, penetrating the center of the valve plate, and allowing the penetrating end to enter the valve center groove; A blow-by gas inlet 1 formed on the other side of the engine cover opposite to the pressure control chamber and through which blow-by gas flows from the engine; And a blow-by gas flow path 1 formed to guide the movement of the blow-by gas from the blow-by gas inlet 1 to the pressure control chamber,

The second ventilation unit may include a built-in PCV valve installed inside the engine cover; a PCV installation block for coupling the built-in PCV valve to be installed on an inner wall of an engine cover; Separating walls extending and coupled to both sides of the PCV installation block to form respective passages by dividing the second ventilation unit up and down in the longitudinal direction from the PCV installation block as a starting point; a blow-by gas inlet 2 formed on the engine cover opposite to the built-in PCV valve and through which blow-by gas flows from the engine; a blow-by gas inlet 2 provided in the lower space of the partition wall to communicate with the blow-by gas inlet side of the built-in PCV valve from the blow-by gas inlet 2 to guide the movement of the blow-by gas; a blow-by gas distribution passage provided in the upper space of the partition wall to communicate with the blow-by gas discharge side of the built-in PCV valve; and an exhaust unit communicating with the blow-by gas distribution passage to discharge and connect the blow-by gas to the intake manifold.

Here, the fresh air inlet hole is formed in the valve cover to be positioned on the center line of the breather nipple, and the exhaust hole and the valve plate are formed so as to deviate from the center line of the breather nipple on one side of the new air inlet hole.

At this time, the fresh air inlet hole and a certain area around it are depressed downward from the bottom surface of the valve cover so that the new air inlet hole is formed at a position relatively farther from the breather nipple than the inlet exhaust hole position, so that when the new air inflow The valve plate first closes, so that the inlet pressure of the new machine is offset against the valve plate, and the residual pressure fluid is introduced into the engine through the inlet hole.

And, the exhaust unit is composed of a plurality of exhaust ports equally distributed throughout the blow-by gas distribution passage.

At this time, a built-in PCV valve is installed at an intermediate position between the exhaust port 1 and the exhaust port 2 among the plurality of exhaust ports.

In addition, the PCV installation block and the separating wall are manufactured as individual parts and assembled to the engine cover.

The present invention blocks the reverse flow of blowby gas discharged from an internal combustion engine and excessively flows into the engine to generate static pressure, and at the same time allows a certain amount of new air freshener to flow in through the fresh air inlet hole, thereby preventing leakage of joints and sealing parts due to reverse flow pressure It solves the problem and has the effect of improving the performance of the engine by adjusting the pressure inside the engine room to an appropriate level.

In addition, the present invention allows the relative pressure inside the engine room to be adjusted through a simple method of adjusting the hole size of the fresh air inlet hole, so that the engine can be operated stably without performing difficult and cumbersome work according to engine pressure control. There is no need to provide a separate device required for engine pressure control, so it has an economical effect.

In addition, the present invention has an effect of improving the performance of the engine by fundamentally preventing the occurrence of icing due to the difference with the outside temperature by installing the PCV valve inside the engine cover.

In addition, the present invention has an effect of preventing vehicle accidents due to subsequent causes in advance by making the PCV valve built into the inner space of the engine cover so that the user cannot arbitrarily remove the PCV valve.

In addition, the present invention has the effect of making the appearance of the engine room beautiful by integrally forming the branch flow path of the blow-by gas discharged to the intake manifold side through the PCV valve by dividing the inner space of the engine cover, and the branch flow path has the effect of stably distributing to the manifold of the manifold as is enlarged by utilizing the inner space of the engine cover.

1 is a perspective view showing the outer appearance of an engine cover to which a ventilation structure of a vehicle internal combustion engine according to an embodiment of the present invention is applied.
Figure 2 is a front view showing a first ventilation unit structure according to an embodiment of the present invention.
3 is an enlarged view of part “A” of FIG. 2, a perspective view showing a pressure control room;
Figure 4 is a plan view showing the valve cover disclosed in Figure 3;
5 is an enlarged view of part “A” of FIG. 2, and is a cross-sectional view showing fresh air inlet flow in an engine part-load condition.
FIG. 6 is an enlarged view of part “A” of FIG. 2, and is a cross-sectional view showing an exhaust flow of blow-by gas in an engine pre-load condition.
7 is a front view showing a structure of a second ventilation unit according to an embodiment of the present invention;

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in this specification are only illustrated for the purpose of explaining the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention These may be embodied in various forms and are not limited to the embodiments described herein.

Embodiments according to the concept of the present invention can apply various changes and can have various forms, so the embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosures, and includes modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component, for example, without departing from the scope of rights according to the concept of the present invention, a first component may be named a second component, Similarly, the second component may also be referred to as the first component.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle. Expressions describing the relationship between components, such as "between" and "directly between" or "directly adjacent to" should be interpreted similarly.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, but one or more other features or numbers, It should be understood that the presence or addition of steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this specification, it should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these examples. Like reference numerals in each figure indicate like elements.

1 is a perspective view showing an external appearance of an engine cover to which a ventilation structure of a vehicle internal combustion engine according to an embodiment of the present invention is applied.

Referring to Figure 1, an engine cover 110 of an internal combustion engine is disclosed. The engine cover 110 divides the inner space of regions indicated by numerals 120 and 130 in FIG. 1 in the longitudinal direction to form two independent spaces.

At this time, when the engine is fully loaded in any one side of the partitioned internal space, the first ventil discharges the blow-by gas to the air-cleaner through the breather nipple A ration part is formed. Reference numeral 120 indicates the first ventilation unit.

In addition, a second ventilation unit for discharging blow-by gas to an intake manifold through a PCV valve is formed in a space on another side of the engine cover 110 that is independent of the engine when the engine is part-loaded. Reference numeral 130 indicates a second ventilation unit.

Hereinafter, a first ventilation unit according to an embodiment of the present invention will be described with reference to FIGS. 2 to 6 .

2 is a front view showing a structure of a first ventilation unit according to an embodiment of the present invention, and FIG. 3 is an enlarged view of “A” part of FIG. 2, which is a perspective view showing a pressure control room, and FIG. A plan view showing the disclosed valve cover, and FIG. 5 is an enlarged view of part “A” of FIG. 2, which is a cross-sectional view showing fresh air intake flow in an engine part-load condition, and FIG. 6 is an enlarged view of part “A” of FIG. 2 As a diagram, it is a cross-sectional view showing the blow-by gas exhaust flow in the engine pre-load condition.

As shown in the figure, the first ventilation unit 120 forms a breather nipple 121 protruding from either end of the engine cover 110 in the longitudinal direction.

The breather nipple 121 is connected to the air cleaner (not shown) by a hose and serves as an outlet for sending the blow-by gas generated in the engine to the air cleaner.

In addition, the valve cover 122 is coupled to the engine cover 110 so as to enclose and seal the inlet of the breather nipple 121 inside the engine cover.

At this time, the valve cover 122 provides a rectangular housing structure with an open top.

Steps may be protruded from the edge of the valve cover 110 so as to be fitted to the wall surface of the engine cover 110. In addition, it is possible to maintain airtightness by inserting a packing member between the engine cover 110 and preventing internal pressure from leaking.

Such airtightness is a condition required for precisely controlling the pressure by the fresh air intake hole 122c, which will be described later.

As shown in FIG. 4, the valve cover 122 is formed with a valve center groove 122a, an exhaust hole 122b, and a new intake hole 122c at the bottom.

The valve center groove 122a is formed by recessing the bottom of the valve cover 122 to a certain depth, and provides a structure in which the end of the valve shaft 124, which will be described later, is inserted to a certain depth.

Perforated exhaust holes 122b are formed around the valve center groove 122a in a concentric direction.

Forming the exhaust hole 122b in a porous form is to distribute pressure while the blow-by gas exhausted from the engine passes through the porous holes.

In addition, a valve plate 123 is installed on the valve shaft 124 above the exhaust hole 122b to open or close the exhaust hole 122b while moving in a vertical direction.

Such a valve plate 123 passes the blow-by gas generated in the engine according to the action of the one-way valve to be exhausted to the air cleaner side (not shown), but on the contrary, the blow-by exhausted to the air cleaner (not shown) It serves to prevent the gas from flowing back into the engine cover 110.

Such a valve plate 123 is manufactured in a plate shape, and may be made of rubber material, synthetic rubber material, or gaskets.

In addition, the valve shaft 124 is a shaft protrusion structure extending to the lower portion of the engine cover 110, and penetrates the center of the valve plate 123 so that the penetrating end is inserted into the valve center groove 122a to obtain a valve plate (123) is guided so that it can be moved freely.

The valve plate 123 coupled to the valve shaft 124 is free to ascend and descend in the vertical direction, but the end of the valve shaft 124 is inserted into the valve center groove 122a at a certain depth, so that the valve plate 123 is inserted therebetween. ) provides a structure from which it cannot escape.

In addition, a new intake hole 122c is formed at a position away from the exhaust hole 122b of the valve cover 122.

The fresh air intake hole 122c is formed by drilling a hole of a predetermined diameter in the valve cover 122, and forms a bypass passage so that a limited amount of fresh air flowing from the air cleaner side flows into the engine cover 110.

For example, in the pre-load state, the blow-by gas is exhausted to the air cleaner side through the breather nipple 121, but in the partial-load state, the air freshener on the air cleaner side flows back to the engine side through the breather nipple 121 due to negative pressure this will happen

At this time, the excessive flow of fresh air flowing into the engine causes fatal problems to the engine. In order to prevent this, a one-way valve is installed at the front end of the breather nipple 121 to block the inflow of fresh air.

However, when the inflow of the fresh air is completely blocked, the overpressure cannot be overcome and the valve bursts.

Therefore, the present invention blocks the reverse flow of the blowby gas discharged from the internal combustion engine and excessively flows into the engine to generate static pressure, and at the same time allows a certain amount of new air freshener to flow through the fresh air inlet hole 122c. It is to solve the leakage problem of junction and sealing part, and to improve the performance of the engine by adjusting the pressure inside the engine room to an appropriate level.

Through a simple method of adjusting the size of the fresh air intake hole 122c, the relative pressure inside the engine room can be adjusted. For example, the pressure inside the engine room is adjusted using an interlocking relationship in which the pressure in the engine room rises or falls according to the amount of air freshener flowing into the engine room.

The size of the fresh air intake hole 122c is very small compared to the total area of the exhaust hole 122b. Referring to FIG. 4, it can be seen that it is formed at a ratio of about 1/20.

Of course, the size of the fresh air intake hole 122c is designed in consideration of various variables such as engine displacement, and is not limited to the embodiment disclosed in the drawings.

As described above, the present invention not only enables stable operation of the engine without performing difficult and cumbersome work according to engine pressure control, but also has a very economical advantage because it does not require a separate device for engine pressure control.

As described above, the fresh air inlet hole 122c is formed in the valve cover 122 so as to be located on the center line of the breather nipple 121, and one side of the fresh air inlet hole 122c is formed on the center line of the breather nipple 121. An exhaust hole 122b and a valve plate 123 are formed.

In addition, the fresh air inlet hole 122c and a certain area around it are depressed downward from the bottom surface of the valve cover 122 so that the position of the fresh air inlet hole 122c is higher than the position of the inlet exhaust hole 122b. ), so that the valve plate 123 first closes when the fresh air is introduced, so that the new inflow pressure collides with the valve plate 123 to be offset, and the residual pressure fluid is transferred to the new fresh air inlet hole 122c. ) through the engine side.

In addition, a blow-by gas inlet 1 (125) through which blow-by gas flows from the engine is formed on the other side of the engine cover 110 in the opposite direction to the pressure control chamber 122', and the blow-by gas inlet 1 (125) A blow-by gas inlet passage 1 (126) is formed to guide the movement of the blow-by gas from the pressure control chamber 122'.

Hereinafter, with reference to FIG. 7, the second ventilation unit 130 according to an embodiment of the present invention will be described.

7 is a front view showing the structure of a second ventilation unit according to an embodiment of the present invention, and the second ventilation unit 130 as shown in the figure is a built-in PCV valve inside the engine cover 110 ( 131) is installed.

The built-in PCV valve 131 is a kind of one-way valve device capable of controlling the flow path of fluid in one direction.

This PCV valve device is mounted on the engine cover and serves to circulate a certain amount of flow of blow-by gas existing inside the crank to the intake manifold.

The built-in PCV valve 131 is installed on the inner wall of the engine cover 110 using the PCV installation block 132. For example, the PCV installation block 132 serves as a joining member for properly installing the built-in PCV valve 131 provided in the form of a single unit to the internal structure of the engine cover 110.

Partition walls 133 are extended and coupled to both sides of the PCV installation block 132. The separating wall 133 divides the second ventilation unit 130 up and down in the longitudinal direction to form a blow-by gas inlet passage 2 134 and a blow-by gas distribution passage 135.

In addition, a blow-by gas inlet 2 (137) through which blow-by gas flows from the engine is formed on the engine cover 110 in the opposite direction to the built-in PCV valve 131, and from the blow-by gas inlet 2 (137), the built-in A blow-by gas inflow passage 2 (134) is formed in the lower space of the partition wall 133 so as to communicate with the blow-by gas inlet side of the PCV valve 131 and guide the movement of the blow-by gas.

And, a blow-by gas distribution passage 135 is formed in the upper space of the partition wall 133 to communicate with the blow-by gas discharge side of the built-in PCV valve 131.

In addition, an exhaust unit 136 communicating with the blow-by gas distribution passage 135 to discharge and connect the blow-by gas to the intake manifold is formed.

At this time, the exhaust unit 136 may include a plurality of exhaust ports 136a, 136b, 136c, and 136d equally distributed throughout the blow-by gas distribution passage 135.

In addition, the built-in PCV valve 131 may be installed at an intermediate position between the exhaust port 1 (136a) and the exhaust port 2 (136b) among the plurality of exhaust ports.

In addition, the PCV installation block 132 and the separating wall 133 may be manufactured as individual parts and assembled to the engine cover 110 .

According to the present invention, the PCV valve is installed inside the engine cover to fundamentally prevent the occurrence of icing due to a difference in temperature from the outside, thereby improving the performance of the engine.

In addition, the present invention has an effect of preventing vehicle accidents due to subsequent causes in advance by making the PCV valve built into the inner space of the engine cover so that the user cannot arbitrarily remove the PCV valve.

In addition, the present invention divides the inner space of the engine cover and integrally forms the branch flow path of the blow-by gas discharged to the intake manifold side through the PCV valve, so that the appearance of the engine room is beautiful, as well as the branch flow path is the engine cover Stable distribution to the manifold is achieved according to the large-area utilization of the internal space.

As described above, although the embodiments have been described with limited drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

110: engine cover 120: first ventilation unit
121: breather nipple 122: valve cover
122 ': pressure control room 122a: valve center home
122b: exhaust hole 122c: fresh air intake hole
123: valve plate 124: valve shaft
125: blow-by gas inlet 1 126: blow-by gas inlet 1
130: second ventilation unit 131: built-in PCV valve
132: PCV installation block 133: dividing wall
134: blow-by gas inflow passage 2 135: blow-by gas distribution passage
136: exhaust part 136a: exhaust port 1
136b: exhaust port 2 136c: exhaust port 3
136d: exhaust port 4 137: blow-by gas inlet 2

Claims (8)

The internal space of the engine cover is partitioned in the longitudinal direction to form two independent spaces, and when the engine is fully loaded in one of the independent spaces, blow-by to the air-cleaner through the breather nipple It forms a first ventilation part that discharges blow-by gas, and blow-by gas is blow-by to the intake manifold through the PCV valve when the engine is part-loaded in the other independent space. In the ventilation structure of a vehicle internal combustion engine forming a second ventilation unit for discharging,
The first ventilation unit,
A breather nipple protruding from one end of the engine cover in the longitudinal direction is formed,
a valve cover coupled to the engine cover to seal the inlet of the engine cover by surrounding the breather nipple;
a valve center groove formed by recessing the bottom of the valve cover to a predetermined depth;
porous exhaust holes concentrically formed around the valve center groove;
a plate-shaped valve plate installed above the exhaust hole to open and close the exhaust hole to prevent back flow of blow-by gas into the engine cover;
a valve shaft extending from the lower portion of the engine cover, penetrating the center of the valve plate, and allowing the penetrating end to enter the valve center groove, thereby guiding the valve plate to move freely;
A pressure control chamber consisting of a new inlet hole formed by drilling a hole in the valve cover at a position away from the exhaust hole of the valve cover to form a bypass flow path so that the fresh air flowing from the air cleaner side flows into the engine cover by a limited amount, ,
A blow-by gas inlet 1 through which blow-by gas flows from the engine is formed on the other side of the engine cover opposite to the pressure control chamber,
A ventilation structure of a vehicle internal combustion engine forming a blow-by gas flow path 1 to guide the movement of the blow-by gas from the blow-by gas inlet 1 to the pressure control chamber.
The internal space of the engine cover is partitioned in the longitudinal direction to form two independent spaces, and when the engine is fully loaded in one of the independent spaces, blow-by to the air-cleaner through the breather nipple It forms a first ventilation part that discharges blow-by gas, and blow-by gas is blow-by to the intake manifold through the PCV valve when the engine is part-loaded in the other independent space. In the ventilation structure of a vehicle internal combustion engine forming a second ventilation unit for discharging,
The second ventilation unit,
Built-in PCV valve installed inside the engine cover;
a PCV installation block for coupling the built-in PCV valve to be installed on an inner wall of an engine cover;
Separating walls extending and coupled to both sides of the PCV installation block to form respective passages by dividing the second ventilation unit up and down in the longitudinal direction from the PCV installation block as a starting point;
a blow-by gas inlet 2 formed on the engine cover opposite to the built-in PCV valve and through which blow-by gas flows from the engine;
a blow-by gas inlet 2 provided in the lower space of the partition wall to communicate with the blow-by gas inlet side of the built-in PCV valve from the blow-by gas inlet 2 to guide the movement of the blow-by gas;
a blow-by gas distribution passage provided in the upper space of the partition wall to communicate with the blow-by gas discharge side of the built-in PCV valve; and
Ventilation structure of a vehicle internal combustion engine comprising: an exhaust unit communicating with the blow-by gas distribution passage and discharging and connecting the blow-by gas to the intake manifold side.
The internal space of the engine cover is partitioned in the longitudinal direction to form two independent spaces, and when the engine is fully loaded in one of the independent spaces, blow-by to the air-cleaner through the breather nipple It forms a first ventilation part that discharges blow-by gas, and blow-by gas is blow-by to the intake manifold through the PCV valve when the engine is part-loaded in the other independent space. In the ventilation structure of a vehicle internal combustion engine forming a second ventilation unit for discharging,
The first ventilation unit,
A breather nipple protruding from one end of the engine cover in the longitudinal direction;
a valve cover coupled to the engine cover to form a pressure control chamber so as to seal an inlet of the engine cover of the breather nipple;
a valve center groove formed by recessing the bottom of the valve cover to a predetermined depth;
porous exhaust holes concentrically formed around the valve center groove;
a plate-shaped valve plate installed to open and close the exhaust hole at an upper side of the exhaust hole;
a valve shaft extending under the engine cover, penetrating the center of the valve plate, and allowing the penetrating end to enter the valve center groove;
A blow-by gas inlet 1 formed on the other side of the engine cover opposite to the pressure control chamber and through which blow-by gas flows from the engine; and
A blow-by gas flow path 1 formed to guide the movement of the blow-by gas from the blow-by gas inlet 1 to the pressure control chamber;
The second ventilation unit,
Built-in PCV valve installed inside the engine cover;
a PCV installation block for coupling the built-in PCV valve to be installed on an inner wall of an engine cover;
Separating walls extending and coupled to both sides of the PCV installation block to form respective passages by dividing the second ventilation unit up and down in the longitudinal direction from the PCV installation block as a starting point;
a blow-by gas inlet 2 formed on the engine cover opposite to the built-in PCV valve and through which blow-by gas flows from the engine;
a blow-by gas inlet 2 provided in the lower space of the partition wall to communicate with the blow-by gas inlet side of the built-in PCV valve from the blow-by gas inlet 2 to guide the movement of the blow-by gas;
a blow-by gas distribution passage provided in the upper space of the partition wall to communicate with the blow-by gas discharge side of the built-in PCV valve; and
Ventilation structure of a vehicle internal combustion engine comprising: an exhaust unit communicating with the blow-by gas distribution passage and discharging and connecting the blow-by gas to the intake manifold side.
According to claims 1 and 3,
Ventilation structure of a vehicle internal combustion engine in which the fresh air intake hole is formed in the valve cover to be located on the center line of the breather nipple, and the exhaust hole and the valve plate are formed so as to deviate from the center line of the breather nipple on one side of the air intake hole.
According to claim 4,
The fresh air inlet hole and a certain area around it are recessed downward from the bottom surface of the valve cover so that the new air inlet hole is formed at a position relatively farther from the breather nipple than the inlet exhaust hole, so that the valve plate is First, a ventilation structure of a vehicle internal combustion engine that operates closed so that the air intake pressure is offset by hitting the valve plate, and the residual pressure fluid flows into the engine side through the air intake hole.
The method of any one of claims 2 and 3,
The exhaust unit is a ventilation structure of a vehicle internal combustion engine consisting of a plurality of exhaust ports equally distributed throughout the blow-by gas distribution passage.
According to claim 6,
A ventilation structure of a vehicle internal combustion engine in which a built-in PCV valve is installed at an intermediate position between exhaust port 1 and exhaust port 2 among the plurality of exhaust ports.
The method of any one of claims 2 and 3,
The ventilation structure of a vehicle internal combustion engine in which the PCV installation block and the separating wall are manufactured as individual parts and assembled to the engine cover.

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