KR102097997B1 - Intake manifold - Google Patents

Abstract

The present invention relates to an intake manifold, a PCV chamber is formed in a portion between the runner of the mounting portion directly connected to the cylinder head, and a one-way valve allowing movement of PCV gas from the PCV chamber to the runner only on the partition wall between the PCV chamber and the runner. Means are installed.
Since the PCV gas outlet is located at the distal end of the runner close to the cylinder head, freezing of the PCV gas outlet is prevented, and the distribution of PCV gas for each runner is possible, thereby improving the distribution of PCV gas, thereby improving engine performance.

Description

Intake manifold {INTAKE MANIFOLD}

The present invention relates to an intake manifold, and more particularly, to an intake manifold in which a PCV flow path is formed.

There is a fine gap between the piston of the automobile engine and the cylinder wall, through which the blow-by gas flows into the crankcase from the combustion chamber. Blow-by gas is mostly unburned fuel and includes combustion gas, partially oxidized mixed gas and trace engine oil.

When blow-by gas remains in the crankcase, corrosion occurs inside the engine and engine oil performance deteriorates, so it is necessary to remove it.If discharged into the atmosphere, it causes air pollution. It is discharged through the exhaust system.

Such a blow-by gas treatment system is called a blow-by gas reduction device (PCV; Positive Crankcase Ventilation). The PCV includes a reflux passage for inducing blow-by gas from the crankcase to the upper space of the cylinder head through the cylinder block, and a PCV hose connecting the cylinder head cover and a predetermined position of the inlet pipe of the intake manifold.

Therefore, the blow-by gas is supplied to the combustion chamber through the reflux passage of the crankcase, cylinder block, PCV hose, and intake manifold, and then burned, and then purified and discharged through the exhaust system to ventilate the crankcase, and to discharge blow-by gas. Air pollution.

On the other hand, when cold starting in the cryogenic region and in winter, the air flowing through the inlet pipe of the intake manifold is low-temperature dry, and the PCV gas flowing from the crankcase is relatively hot and humid, so it is inspired by contact between PCV gas and fresh air. The freezing of moisture occurs around the PCV gas outlet formed in the inlet pipe of the manifold. In this state, if the engine operation is continued, the amount of freezing increases and the PCV gas outlet is blocked, such that the PCV gas circulation action is not normally performed, and in severe cases, the intake manifold is damaged.

In addition, the PCV gas is mixed while moving with the fresh air, but since the mixing is not made to the extent that it has a uniform distribution in the entire interior space of the surge tank, the same amount of PCV gas is not distributed for each runner. That is, the distribution of PCV gas is not good, and this causes a difference in gas components supplied to the combustion chamber (causes poor air-fuel ratio between cylinders), thereby deteriorating engine performance.

Republic of Korea Patent Publication No. 10-2013-0057189 (2013.05.31.)

Accordingly, the present invention was devised to solve the above problems, and an object thereof is to provide an intake manifold in which icing around the PCV gas outlet of the intake manifold is prevented and distribution of PCV gas for each runner is improved.

The present invention for achieving the above object, in the intake manifold having a mounting portion formed with a plurality of outlets of the runner, PCV directly connected to the PCV gas outlet of the cylinder head between the outlet of the two runners adjacent to each other of the mounting portion A chamber is formed, and a one-way valve means that is opened only toward the runner from the PCV chamber by a negative pressure formed on the runner is installed on each of the partition walls between the PCV chamber and the runners on both sides, and the PCV chamber is used only as a runner where negative pressure is formed by engine piston operation. It is characterized in that the PCV gas is moved from.

The one-way valve means is a check valve, and the check valve is press-fitted into an installation hole formed through a partition wall between the PCV chamber and both runners.

The welding circumference of the entrance of the installation hole is laser welded so that the annular fusion ring protrudes in the radial direction of the installation hole, thereby preventing the check valve from being detached.

A semi-circular circumferential groove is formed on one side of the entrance of the installation hole, and a protrusion is formed inside the circumferential groove, and a disk-shaped fusion piece is formed to prevent the protrusion from being detached by being heat-pressed by a heating rod.

The one-way valve means is a diaphragm valve, and the diaphragm portion of the diaphragm valve is normally in close contact with the runner side of the partition wall, and when a negative pressure acts on the runner, the flow path hole formed in the partition wall is opened from the partition wall.

The flow path hole is formed inside the radius range of the diaphragm portion.

The diaphragm valve is installed by inserting a cylindrical body protruding from the diaphragm portion into an installation hole formed in the partition wall, and the body is spaced apart from the diaphragm portion to form a locking portion protruding outward in the radial direction of the body, in the installation hole When the body is inserted, the locking portion is caught on the opposite side of the partition so that the diaphragm valve does not deviate from the installation hole.

The mounting portion is provided with a gasket sealing between the intake manifold and the cylinder head, the gasket comprising a PCV chamber sealing portion surrounding the PCV chamber and a runner sealing portion surrounding the runners on both sides of the PCV chamber and the PCV chamber. Between runners are sealed.

According to the present invention as described above, since the PCV gas outlet is located at the end of the fresh air inlet path of the intake manifold, the temperature of the fresh air rises and this part is close to the cylinder head, so the temperature is high at the PCV gas outlet. No icing occurs. Therefore, clogging of the outlet of the PCV gas due to freezing is prevented, so that the PCV gas can be smoothly circulated and damage to the intake manifold is prevented.

In addition, since the one-way valve means are provided in both connecting passages connecting the two side runners and the PCV chamber, independent PCV gas distribution is performed for each runner, thereby improving the PCV gas distribution and preventing air-fuel ratio defects between cylinders, thereby improving engine performance. There is an effect to be improved.

1 is a perspective view of an intake manifold according to the present invention.
Figure 2 is an enlarged view of part A of Figure 1;
Figure 3 is a cross-sectional plan view including a runner portion of the intake manifold.
4 is an enlarged view of part B of FIG. 3.
5 is an embodiment of the present invention, when a check valve is applied as a one-way valve means, an embodiment of a check valve fixing structure.
6 is another embodiment of the check valve fixing structure.
7 and 8 are diagrams for explaining the flow structure of the PCV gas of the intake manifold according to the present invention, and FIG. 7 is a state diagram when inhaling the first runner and FIG. 8 is a state diagram when inhaling the second runner.
9 is a view showing the flow state of the PCV gas when the first runner intake without a check valve installed.
10 is an installation state diagram of a diaphragm valve as another embodiment of the one-way valve means.
11 is a perspective view of the diaphragm valve.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. The thickness of the lines or the size of components shown in the accompanying drawings may be exaggerated for clarity and convenience.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the intake manifold includes an inlet pipe 1 through which fresh air flows through a throttle body (not shown), a surge tank 2 as an expansion space connected to the inlet pipe 1, and surge The tank 2 includes a plurality of runners 3 branched to the same number as the cylinder. In the illustrated example, four runners 3 are formed as intake manifolds for a four-cylinder engine.

The runner 3 is opened through the mounting portion 4 which is a mounting portion on the cylinder head side of the intake manifold. That is, the outlet of the runner 3 is formed on the front surface of the mounting portion 4.

The mounting part 4 is mounted via a bolt on the surface where the fresh air inlet of the cylinder head is formed, and in the mounted state, the runner 3 is directly connected to the same fresh air inlet formed in the cylinder head.

A PCV chamber 5 is formed between the runners 3 in the mounting portion 4. Two runners each form a pair, and a PCV chamber is formed between the pair of runners. That is, when four runners 3 are present, the PCV chamber 5 is respectively provided between the first runner 3a and the second runner 3b and between the third runner 3c and the fourth runner 3d. ) Is formed.

When the intake manifold is mounted on the cylinder head, a PCV gas outlet directly connected to the PCV chamber 5 is formed on the mounting surface of the cylinder head. The PCV gas outlet is connected to the crankcase through passages formed in the cylinder head and cylinder block.

The PCV chamber 5 is a small space formed between the two side runners 3, and a one-way valve means is installed on the partition wall between the PCV chamber 5 and the two side runners 3. The one-way valve means is opened by the negative pressure formed on the runner 3 by the piston operation of the engine, allowing only PCV gas movement from the PCV chamber 5 toward the runner 3, and blocking gas movement in the opposite direction. Plays a role.

As one-way valve means, a check valve 10 or a diaphragm valve 20 to be described later may be applied.

For the installation of the check valve 10, an installation hole 6 penetrating both spaces is formed in the partition wall between the PCV chamber 5 and the runner 3 (see FIG. 3).

The check valve 10 is cylindrical and is formed in a shape (conical inclined surface) in which the end of the flow direction is reduced in diameter. The installation hole 6 is also formed in a shape in which the end of the runner 3 side decreases in diameter. Therefore, the check valve 10 is pressed into the runner 3 from the PCV chamber 5 side to the installation hole 6. It is impossible for the check valve 10 to be released toward the runner 3 by the shape of the check valve 10 and the installation hole 6 as described above (see FIG. 4).

5, after the check valve 10 is pressed into the installation hole 6, laser welding is performed around the entrance of the installation hole 6 to form an annular fusion ring 6a. The fusion ring 6a is formed in a shape protruding radially inward from the inner wall surface at the front circumference of the installation hole 6 so that the check valve 10 is released from the installation hole 6 toward the PCV chamber 5 It prevents.

6 is to form a fusion piece (6c ') by hot staking (Hot Staking) to prevent the check valve 10 from falling into the PCV chamber (5). To this end, the semi-circular circumferential groove 6b is formed in contact with the entrance of the installation hole 6. By the formation of the circumferential groove 6b, an approximately semicircular protrusion 6c is formed in the inner portion of the circumferential groove 6b. Thus, after inserting the check valve 10 into the installation hole 6 in the state where the circumferential groove 6b and the protrusion 6c are formed, the welding piece is welded by heating and compressing the protrusion 6c with a heating rod (heated metal rod). (6c '). As the protrusions 6c are melted and compressed, some are accommodated in the circumferential grooves 6b, and some are expanded radially inside of the installation hole 6 to form a disk-shaped fusion piece 6c 'as a whole. The inner portion of the installation hole 6 of 6c ') blocks the back of the check valve 10 so that the check valve 10 cannot be released toward the PCV chamber 5.

The operation and effects of the present invention will be described with reference to FIGS. 7 and 8.

7 and 8 schematically show the intake manifold and the cylinder head 30 coupling portion. Since the PCV gas movement process is the same between the first runner 3a and the second runner 3b and between the third runner 3c and the fourth runner 3d, the first runner 3a and the second run Only the portion between the runners 3b will be described as an example.

PCV gas is discharged to an outlet formed on the surface of the mounting portion 4 of the cylinder head 30 and introduced into the PCV chamber 5 of the intake manifold.

When a negative pressure is formed in the first runner 3a by the piston operation of the engine, the check valve 10 on the first runner 3a side is opened by the action of the negative pressure, so that the PCV gas is supplied to the first runner in the PCV chamber 5 ( 3a), and is introduced into the combustion chamber through the fresh air inlet of the cylinder head connected to the first runner 3a together with the fresh air sucked into the first runner 3a. At this time, since the check valve 10 on the second runner 3b side is not opened, there is no PCV gas movement to the second runner 3b, and the PCV gas flows into the first runner 3a only.

On the contrary, as shown in FIG. 8, when negative pressure is formed in the second runner 3b, the check valve 10 on the first runner 3a side is closed and the check valve 10 on the second runner 3b side is opened so that PCV gas is removed. It only flows toward the 2 runners 3b.

As described above, since the PCV gas is introduced only to the runner 3 where the negative pressure is formed according to the piston operation, the PCV gas is introduced to each of the runners 3a, 3b, 3c, and 3d independently. That is, when PCV gas flows into any arbitrary runner 3, it is not affected by the fresh air flow and pressure state of the remaining runners 3, so that each runner 3a, 3b, 3c, 3d always has a constant amount. PCV gas flows in, which is the same for all runners 3a, 3b, 3c, 3d, and improves the distribution of PCV gas to individual runners 3a, 3b, 3c, 3d from the overall perspective of the intake manifold.

As such, when the PCV gas distribution property is improved, the gas component supplied to each combustion chamber becomes uniform, thereby preventing defects in air-fuel ratio between cylinders, thereby reducing the noise and vibration by uniformizing the explosive power for each cylinder, and generating energy loss due to vibration. It has the effect of improving the overall performance of the engine, such as improving fuel efficiency, improving combustion performance, and reducing exhaust gas.

On the other hand, when there is no one-way valve means such as a check valve 10 on the flow path (corresponding to the installation hole 6) connecting between the PCV chamber 5 and the runners 3a, 3b on both sides as shown in FIG. In the second runner 3a, for example, when the negative pressure acts on the first runner 3a and the PCV gas of the PCV chamber 5 moves to the first runner 3a, the flow path on the second runner 3a side is not blocked. The fresh air of the runner 3b flows into the first runner 3a through the PCV chamber 5.

Accordingly, the amount of fresh air supplied to the combustion chamber connected to the first runner 3a is excessively increased, so that it is impossible to form an appropriate air-fuel ratio, and also fresh air flow flowing from the second runner 3b side through the first runner 3a. Since the fresh air flowing into the combustion chamber connected to it is disturbed, it is impossible to form an intended gas flow (for good combustion) in the combustion chamber, and the combustion performance is lowered, thereby deteriorating various performances of the engine.

In order to achieve the object of the present invention as described above, the flow path connecting the PCV chamber 5 and the runners 3a and 3b on both sides of the PCV gas flows from the PCV chamber 5 to the corresponding runner only toward the runner where negative pressure is applied. It can be seen that an allowable one-way valve means must be provided.

On the other hand, in the intake manifold according to the present invention, the PCV chamber 5 is formed in the portion between the outlets of both runners, and the PCV gas is runner 3 through the flow path passing through the partition wall between the PCV chamber 5 and both runners. Since it is discharged to), a separate PCV hose does not exist, and as soon as the PCV gas is discharged into the runner 3, it is immediately moved to the fresh air inlet of the cylinder head 30 with fresh air.

That is, in the fresh air movement path of the intake manifold, the PCV gas outlet is located at the distal end of the fresh air movement path, so that the temperature of the fresh air rises, the temperature difference from the PCV gas is reduced, and the position of the PCV gas outlet is adjacent to the high temperature cylinder head. Because of this, there is no ice formation or expansion around the PCV gas outlet.

Accordingly, clogging of the PCV gas outlet due to freezing is prevented, so that the PCV gas reduction action is smoothly performed, and the intake manifold is not damaged.

10 shows another embodiment of the one-way valve means, showing a state in which the diaphragm valve 20 is installed instead of the check valve 10, and FIG. 11 shows the outer shape of the diaphragm valve 20. .

The diaphragm valve 20 is made of a rubber material, and is spaced a predetermined distance from the cylindrical body 21 and the diaphragm portion 22 and the diaphragm portion 22 formed in a substantially disc shape at one end of the body 21 It includes a locking portion (23) protruding outward in the radial direction of the body (21). The diaphragm portion 22 has a shape in which the circumferential portion of the disk shape sags in the protruding direction of the body 21.

The distance between the diaphragm portion 22 and the locking portion 23 is equal to the thickness of the partition wall between the PCV chamber 5 and the runner 3 of the portion where the diaphragm valve 20 is installed. The diaphragm valve 20 is installed by inserting the body 21 into an installation hole (no drawing number) formed in a partition wall between the PCV chamber 5 and the runner 3. The diaphragm valve 20 can maintain the installation state without being disengaged from the installation hole because the engaging portion 23 is hung on the partition wall on the opposite side of the body 21 insertion direction in the body 21 insertion state.

Around the installation hole in which the body 21 is inserted, a plurality of flow path holes 7 are formed at regular intervals on a concentric circle centering on the installation hole. The flow path hole 7 is located inside the radius range of the diaphragm portion 22.

In addition, the diaphragm portion 22 is located on the side of the runner 3 side of the partition wall, and in general, a circular circumference portion is in close contact with the partition wall to block the flow path hole 7, and when a negative pressure is generated in the runner 3, the partition wall The PCV gas from the PCV chamber 5 can be moved from the PCV chamber 5 to the runner 3 through the flow path hole 7 by being separated from the flow path hole 7.

Therefore, the diaphragm valve 20 also acts as a one-way valve means to control the PCV gas flow as the check valve 10, and the effect of this is the same as that of the check valve 10 described above, so a duplicate description is omitted.

On the other hand, as shown in Figures 1, 2, and 10, the gasket 40 is installed on the front surface of the mounting portion 4 of the intake manifold. The gasket 40 is formed of a PCV chamber sealing part 41 surrounding the PCV chamber 5 and runner sealing parts 42a, 42b formed to be connected to both sides of the PCV chamber 5 and surrounding the two runners 3a, 3b, respectively. consist of.

A gasket groove 8 having the same shape as the gasket 40 is formed on the front surface of the mounting portion 4, so that the gasket 40 is inserted into the gasket groove 8.

When the mounting portion 4 is mounted on the corresponding surface of the cylinder head while the gasket 40 is installed, the gasket 40 is in close contact between the intake manifold and the cylinder head, sealing the two between them, and also forming an independent ring shape. The PCV chamber 5 is sealed between the PCV chamber 5 and the runners 3a, 3b on both sides between the gap between the intake manifold and the cylinder head by the PCV chamber sealing portion 41 and the runner sealing portions 42a, 42b. Gas can flow smoothly only through the path of travel as described above.

As described above, the present invention has been described with reference to the embodiment shown in the drawings, but this is only exemplary, and those skilled in the art to which the art pertains have various modifications and other equivalent embodiments You will understand that it is possible. Therefore, the true technical protection scope of the present invention should be defined by the following claims.

1: Inlet pipe 2: Surge tank
3 (3a, 3b, 3c, 3d): Runner 4: Mounting part
5: PCV chamber 6: Installation hole
6a: fusion ring 6b: circumferential groove
6c: protrusion 6c ': fusion splicing
7: Euro hole 8: Gasket home
10: check valve 20: diaphragm valve
21: body 22: diaphragm portion
23: engaging portion 30: cylinder head
40: gasket 41: PCV chamber sealing portion
42a, 42b: Runner sealing part

Claims (8)

In the intake manifold having a mounting portion formed with a plurality of outlets of the runner,
When the mounting portion is mounted on the cylinder head at a portion between the outlets of two runners adjacent to each other on the front surface of the mounting portion, a PCV chamber is formed which is directly connected to and connected to the PCV gas outlet formed on the cylinder head,
An installation hole is formed through each partition wall between the PCV chamber and the runners on both sides,
A check valve is press-fitted and installed in the installation hole,
The intake manifold, characterized in that the check valve is opened only toward the runner from the PCV chamber by the negative pressure formed on the runner. delete The method according to claim 1,
The inlet manifold, characterized in that the inlet circumference of the installation hole is laser-welded so that an annular fusion ring protrudes in the radially inner direction of the installation hole, thereby preventing departure of the check valve. The method according to claim 1,
A semi-circular circumferential groove is formed at one side of the entrance of the installation hole, and a protrusion is formed inside the circumferential groove, and a fusion-shaped fusion piece is formed to prevent the protrusion from being detached by being heated and compressed by a heating rod. Intake manifold. delete delete delete The method according to claim 1,
The mounting portion is provided with a gasket for sealing between the intake manifold and the cylinder head, the gasket comprising a PCV chamber sealing portion surrounding the PCV chamber and a runner sealing portion surrounding the runners on both sides of the PCV chamber and the PCV chamber. An intake manifold characterized by sealing between runners.

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