KR102583509B1 - Intake manifold for uniform distribution of PCV gas - Google Patents

Abstract

This invention solves the icing phenomenon of PCV gas in the intake manifold and improves rapid recirculation and distribution of PCV gas by individual gas distribution for each cylinder. A PCV chamber is formed using a PCV gas chamber structure near the gas inlet flowing into the intake manifold. This chamber structure is equipped with partition wall(s), which first collects the incoming PCV gas and then distributes it to each cylinder. Additionally, gas-liquid separation may occur in PCV gas by the partition wall. The PCV chamber structure has individual flow paths connected to each cylinder, and these individual flow paths have the same length and cross-sectional area from the flow path starting point to the distribution portion for each cylinder. The final PCV distribution in the chamber structure proceeds in conjunction with the VIS valve operation. That is, when the VIS valve is closed, the distribution port for each cylinder is airtight by the valve and redistribution does not occur, and when the VIS valve is opened, the distribution port for each cylinder is opened and PCV distribution takes place.

Description

Intake manifold for uniform distribution of PCV gas {Intake manifold for uniform distribution of PCV gas}

The present invention relates to an intake manifold, and more specifically, to a structure for uniformly distributing PCV gas to each cylinder in the intake manifold.

The intake manifold functions to supply the mixture formed in the carburetor to the combustion chamber of each cylinder. The intake manifold has a plenum that temporarily stores the mixture supplied to one side of the lower part, a throttle body installed to communicate with one side of the plenum and flows the mixture that has passed through the carburetor, and a mixture stored in the plenum. It consists of an intake runner that guides the flow to the combustion chamber for each cylinder.

Among the mixture supplied to each combustion chamber through the intake runner, the unburned exhaust gas that escapes from the combustion chamber to the crank case through the gap between the cylinder and piston during the compression stroke and expansion stroke is called blow-by gas. It is at a high temperature and is in a state immediately after combustion, so it contains a lot of acidic ingredients, which can quickly deteriorate and oxidize the engine oil in the oil pan. Accordingly, a PCV (Positive Crankcase Ventilation) system is added to circulate the blow-by gas through the intake manifold and return it to the combustion chamber for combustion.

In other words, the blow-by gas (PCV gas) escapes from the combustion chamber to the crankcase, passes through the exhaust passage of the cylinder block and cylinder head and the head cover through the PCV valve, and is recirculated to the intake manifold through a separate PCV hose. The intake manifold is located between the PCV valve and the cylinder. Looking at the circulation path of PCV gas within the intake manifold, the PCV gas flows in through the PCV nipple and is then combined with fresh air (air introduced from the outside) in the latter half of ETC (Electronic Throttle Control) and distributed to each cylinder. Specifically, the PCV gas flowing into the PCV nipple goes straight into the intake manifold without passing through a separate structure, and is mixed immediately after the ETC assembly to ensure that the fresh air and PCV gas are well mixed.

However, in this conventional structure, since the PCV gas is in direct contact with the new device, when the temperature of the new device drops below zero, condensate is generated when it meets the warm PCV gas, and this condensate freezes due to the temperature of the new device, causing the PCV recirculation flow path to close. PCV icing phenomenon that causes blockage occurs. As a result, the PCV gas recirculation flow path becomes blocked, making recombustion of gas impossible. If the recirculation flow path is blocked, the pressure inside the engine increases excessively, leading to engine damage.

In addition, since there is no structure to uniformly distribute the PCV gas to each cylinder, the distribution of the PCV gas for each cylinder varies, resulting in variations in explosive power between cylinders. This deviation in explosive power causes phenomena such as engine bumps and abnormal vibrations.

Accordingly, the present invention is intended to solve the PCV gas icing phenomenon and achieve individual gas distribution for each cylinder to improve rapid recirculation and distribution of PCV gas.

In order to solve the above problem, a PCV chamber is formed using a PCV gas chamber structure near the gas inlet flowing into the intake manifold as a PCV gas distribution structure constructed inside the intake manifold. This chamber structure is equipped with partition wall(s), which first collects the incoming PCV gas and then distributes it to each cylinder. Additionally, gas-liquid separation may occur in PCV gas by the partition wall.

Vibration fusion can be used to install the PCV chamber structure inside the intake manifold.

Additionally, the PCV chamber structure has a streamlined lower surface, and the streamlined structural shape is preferably made tangent to the surge tank portion of the intake manifold. At least the inner surface of this streamlined structural shape is formed to have an inclination of about 3 to 5 degrees on one side, and a drain hole is applied to the end of the inclination to drain the liquid component of the PCV gas separated by the partition using gravity. It is designed to be discharged.

The PCV chamber structure has individual flow paths connected to each cylinder, and it is preferable that these individual flow paths have the same length and cross-sectional area from the flow path starting point to the distribution portion for each cylinder.

The final PCV distribution in the chamber structure proceeds in conjunction with the VIS valve operation. That is, when the VIS valve is closed, the distribution port for each cylinder is airtight by the valve and redistribution does not occur, and when the VIS valve is opened, the distribution port for each cylinder is opened and PCV distribution takes place.

The structure and operation of the present invention introduced above will become clearer through specific embodiments described later with drawings.

According to the present invention, by solving the icing problem of PCV gas, the effect of rapid recirculation of PCV gas can be obtained, and distribution is improved by applying individual distribution channels for each cylinder.

By applying a separate chamber structure to the dead space within the intake manifold to form the PCV chamber, it becomes possible to delete the dead volume inside the intake manifold, thereby improving the distribution and flow rate of the intake manifold itself. The improvement is doubled.

In addition, by adopting a distribution structure linked to the operation of the VIS valve, rapid PCV redistribution is possible under high-speed/high-flow conditions.

By making the lower part of the chamber structure into a streamlined structure, it is possible to improve the distribution and flow rate of the intake manifold itself by eliminating dead volume within the intake manifold plenum.

1A is an external perspective view of an intake manifold.
FIG. 1B is a YY cut perspective view of FIG. 1A.
FIG. 2A is a YY cross-sectional view of FIG. 1A, and FIG. 2B is an enlarged view of the PCV chamber 200 and its surroundings.
FIG. 3A is a lower perspective view of the chamber structure 300 viewed obliquely from below.
Figure 3b is a top perspective view from above.
Figure 3c is a top perspective view from a different angle to show the superstructure in more detail.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Meanwhile, the terms used in this specification are for describing embodiments and are not intended to limit the present invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprise” and/or “comprising” means that a referenced element, step, operation, and/or element is one or more other elements, steps, operations, and/or elements. does not exclude the presence or addition of

1A is an external perspective view of an intake manifold.

The PCV nipple 110, which is a PCV gas inlet, is exposed in the intake manifold 100. PCV gas coming from the PCV valve through a hose (not shown) flows into the intake manifold 100 through the PCV nipple 110.

Figure 1B is a Y-Y cut perspective view of Figure 1A.

As in the general case, VIS valve flaps 130a and 130b are located on one side of the plenum 120 inside the intake manifold 100. Here, it does not mean that there are two flaps of the VIS valve, 130a and 130b, but 130a is shown to indicate that the flap is in the closed position, and 130b is shown to indicate that the flap is in the open position. The VIS (variable induction system) valve is installed in the shape of a flap within the intake manifold to vary the intake amount, and is a device that varies the intake amount according to the opening and closing of the flap.

The PCV chamber 200 according to the present invention is formed in a dead volume within the intake manifold 100 (in the case of the example intake manifold shown in FIG. 1B, the dead space is above the plenum 120). ). And a VIS valve is used to distribute the PCV gas collected in the PCV chamber 200 to the cylinder. That is, the PCV chamber 200 according to the present invention is formed adjacent to the gas distribution passage opened and closed by the VIS valve flaps 130a and 130b.

In the present invention, the PCV gas entering through the PCV nipple 110 is first collected in the PCV chamber 200 with the distribution passage blocked by the VIS valve, and then distributed to the engine combustion chamber through the gas distribution passage when the VIS valve is opened. Therefore, it does not come into direct contact with low-temperature equipment. This prevents the icing phenomenon of PCV gas.

To form the PCV chamber 200, a separate chamber structure 300 is installed at the corresponding location. A detailed description of the chamber structure 300 will be provided later, but first, the PCV distribution mechanism of the intake manifold 100 according to the present invention will be briefly described with reference to FIGS. 2A and 2B. FIG. 2A is a Y-Y cross-sectional view of FIG. 1A, and FIG. 2B is an enlarged view of the PCV chamber 200 and its surroundings.

1) PCV gas (G) generated as the engine drives flows into the intake manifold 100 through the PCV nipple 110, as shown in FIG. 2A. The introduced PCV gas reaches the PCV chamber 200 along the flow path and is collected therein (it is not discharged until the closed VIS valve flap 130a is opened). That is, the PCV gas is collected in a sufficiently saturated state in the chamber 200 by the closed VIS valve flap 130a, and thus the icing phenomenon of the PCV gas is solved. Additionally, it is possible to achieve the effect of separating the liquid component contained in the PCV gas by colliding with the partition wall (described later) formed in the chamber 200 (gas-liquid separation effect).

2) The PCV gas collected in the PCV chamber 200 is distributed to each cylinder as the flap opening 130b of the VIS valve opens the blocked PCV gas distribution port 322 of the PCV chamber 200, as shown in FIG. 2b. It is distributed to each cylinder through the communicating gas flow path 140. In this way, rapid recirculation of the PCV gas (G) is possible through the gas distribution ports 322 formed for each cylinder in the chamber structure 300 and distribution is improved.

Hereinafter, the chamber structure 300 for forming the PCV chamber 200 in the unused space of the intake manifold 100 will be described in detail.

FIG. 3A is a lower perspective view of the chamber structure 300 viewed obliquely from below. And Figure 3b is a top perspective view seen from above, and Figure 3c is a top perspective view seen from another angle to express the upper structure in more detail.

The chamber structure 300 shown here is installed in the unused space inside the intake manifold 100 as shown in FIGS. 1B and 2A to form the chamber 200. Correspondingly, the intake manifold 100 requires a space for installing the PCV chamber structure 300 of the present invention and requires a VIS valve to distribute PCV gas to each cylinder.

Vibration fusion can be used to install the chamber structure 300 inside the intake manifold 100.

At the top of the chamber structure 300, a structure is formed that functions to collect PCV gas, distribute gas for each cylinder, and separate gas and liquid, and at the bottom of the chamber structure 300, a bottom surface 310 is streamlined and tangent to the existing plenum shape. Applies.

The structure formed on the upper part of the chamber structure 300 will be described in detail with reference to FIGS. 3A, B, and C. Basically, the upper part of the chamber structure 300 has the shape of a container in which the PCV gas that enters the PCV gas inlet 311 through the PCV nipple 110 in the intake manifold can collect.

To be specific, there is a primary space 312 where gas entering the PCV gas inlet 311 is primarily collected, and a primary partition 314 stands to define this primary space 312. Here, the primary space 312 and the primary partition 314 are elements for collecting the PCV gas entering the intake manifold before sending it directly to the cylinder combustion chamber. 3B and 3C, the primary partition wall 314 is illustrated as being divided into two, but the present invention is not limited thereto.

The gas once collected in the primary space 312 defined by the primary partition wall 314 is pushed out as the amount of incoming gas continues to increase and flows into a flow path (not limited to this location) located approximately in the center of the primary partition wall 314. It enters the secondary space (318) through 316).

At this time, the liquid component contained in the gas can be separated from the gas by the first partition 314. This is called the gas-liquid separation function. The liquid separated by the gas-liquid separation function of the primary partition 314 is discharged by gravity through a drain hole (not shown) formed in the lower part of the chamber structure 300. To this end, the inner bottom surface of the streamlined bottom surface 310 is formed with an inclined surface of about 3 to 5° toward one end (the left end or right end in Figure 3a), and a drain hole (not shown) is formed at the end of this inclined surface. ) can be formed so that the liquid is naturally discharged through one end of the chamber structure 300.

Additionally, a secondary partition wall 320 stands to define the secondary space 318. Here, the secondary space 318 and the secondary partition wall 320 are elements for distributing PCV gas to each cylinder. In FIGS. 3B and 3C, the secondary partition wall 320 is illustrated as being divided into three parts, but the present invention is not limited thereto.

The secondary partition wall 320 has distribution ports 322a, 322b, 322c, and 322d for each cylinder that distribute gas to each cylinder. The gas entering the secondary space 318 is collected and then distributed to each cylinder (322a). It is supplied to each cylinder through ,322b,322c,322d). As a result, uniform gas distribution can be achieved for each cylinder under high-speed and high-flow conditions (improved distribution of PCV gas).

In order to maximize the improvement of the distribution of PCV gas, the distribution channels (324a, 324b, 324c, 324d) for each cylinder including the distribution ports (322a, 322b, 322c, 322d) for each cylinder are installed from the starting point of the flow path to the distribution port for each cylinder ( It is desirable that the lengths and cross-sectional areas of 322a, 322b, 322c, and 322d) are all the same.

In addition, the above-described gas-liquid separation effect can be achieved by the secondary partition 320, and the bottom surface of the chamber structure 300 can be designed so that the separated liquid component is also discharged through the drain hole described above.

Gas is distributed through the distribution ports 322a, 322b, 322c, and 322d for each cylinder by the action of the VIS valve flaps 130a and 130b, as described above. That is, the VIS valve is normally closed to maintain an airtight state, but when the VIS valve is opened in a specific RPM range, the distribution passages for each cylinder (324a, 324b, 324c, 324d) and the distribution ports for each cylinder (322a, 322b, 322c) ,322d) is opened to distribute PCV gas to each cylinder. This was explained with reference to FIGS. 2A and 2B.

Although the configuration of the present invention has been described in detail above with reference to the accompanying drawings, this is merely an example, and those skilled in the art will be able to make various modifications and changes within the scope of the technical idea of the present invention. Of course this is possible. Therefore, the scope of protection of the present invention should not be limited to the above-described embodiments, but should be determined by the description of the claims below.

Claims (13)

In an intake manifold containing a PCV nipple and a VIS valve,
An intake manifold comprising a chamber structure configured to collect PCV gas entering through the PCV nipple when the VIS valve is closed and distribute it to a combustion chamber when the VIS valve is open. The intake manifold according to claim 1, wherein the chamber structure is further configured to uniformly distribute the collected PCV gas to each cylinder when the VIS valve is opened. The intake manifold according to claim 1, wherein the chamber structure is further configured to separate a liquid component contained in the PCV gas. The intake manifold according to claim 3, wherein the chamber structure further includes a drain hole through which the separated liquid component is discharged. The intake manifold according to claim 1, wherein the chamber structure is installed on the intake manifold by vibration fusion. The intake manifold of claim 1, wherein the chamber structure includes a streamlined outer surface that is tangent to a plenum shape of the intake manifold. In an intake manifold containing a PCV nipple and a VIS valve,
A chamber structure configured to collect the PCV gas entering through the PCV nipple when the VIS valve is closed and distribute it to the combustion chamber when the VIS valve is open,
The chamber structure is
a gas inlet through which the PCV gas introduced through the PCV nipple flows;
A space for collecting PCV gas entering the gas inlet;
Gas-liquid separation means for separating liquid from the PCV gas collected in the space;
An intake manifold including a means for distributing the PCV gas from which the liquid is separated by the gas-liquid separation means for each cylinder. The intake manifold of claim 7, wherein the chamber structure further includes a streamlined bottom surface that is tangent to the plenum shape of the intake manifold. The intake manifold according to claim 7, wherein the gas-liquid separation means of the chamber structure is a partition that defines the PCV gas collection space and separates the liquid component by colliding with the collected PCV gas when it is discharged. The intake manifold of claim 9, wherein the chamber structure further includes an inclined surface formed on a bottom surface of the chamber structure and a drain hole formed at an end of the inclined surface to allow the separated liquid component to be discharged. The intake manifold of claim 7, wherein the PCV gas distribution means for each cylinder includes a distribution passage and a distribution port for each cylinder configured to distribute the PCV gas in the collection space to each cylinder. The intake manifold according to claim 11, wherein the length and cross-sectional area of the distribution passage for each cylinder are the same for each cylinder. The intake manifold according to claim 7, wherein the chamber structure is installed on the intake manifold by vibration fusion.