JP2016160767A - Intake pipe structure of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a back flow of blow-by gas with a simple structure.SOLUTION: An intake pipe structure 1 of an engine is equipped with a surge tank 12 positioned upstream an intake manifold 110 and downstream a throttle body 130, and formed with an opening 121a of a PCV pipe inside. In the inside of the surge tank 12 and at the opening 121a of the PCV pipe, a partition wall 12b extending from an upper wall 12a to a straight line E1 connecting an upper end of a flow path 130x of the throttle body 130 and an upper end of a flow path of the intake manifold 110 is further formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intake pipe structure of an engine mounted on a cylinder head in an engine of a transportation device such as an automobile.

  FIG. 4 is a side view schematically showing a configuration of an intake pipe structure 100 of a gasoline engine (hereinafter referred to as an engine) of an automobile, and FIG. 5 is a plan view thereof.

  As shown in the drawings, an intake pipe structure 100 of an engine includes an intake manifold 110 mounted on a cylinder head of the engine, a surge tank 120 positioned upstream of the intake manifold 110, and a throttle positioned upstream of the surge tank 120. It comprises a body 130 and a valve adjusting portion 131 that adjusts the opening of the throttle valve in the throttle body 130.

  The intake manifold 110 is composed of a plurality of pipes corresponding to the number of cylinders of the engine (not shown), and is a means for introducing air distributed from the surge tank 120 into the cylinder head. As an example, the intake manifold 110 is constructed as a pipe made of synthetic resin. . The surge tank 120 is a means for distributing the air from the throttle body 130 to each pipe of the intake manifold 110, and is configured as a synthetic resin tank, similar to the intake manifold 110. The throttle body 130 is a means for introducing air into the surge tank 120 according to the opening of the throttle valve adjusted by the valve adjusting unit 131, and is made as a metal valve such as steel or aluminum as an example.

  Further, the surge tank 120 is provided with a PCV (positive crankcase ventilation) pipe 121 communicating with the inside of the tank. The PCV pipe 121 communicates with a PCV passage that sucks blow-by gas that leaks into the engine and guides the blow-by gas into the surge tank 120.

  In such an intake pipe structure 100 of the engine, as shown in the AA sectional view of FIG. 5 in FIG. 6, the flow in the throttle body 130 is referred to with reference to the path A-B-C-D in the figure. The air adjusted by the throttle valve 132 in the passage 130x is mixed with the blow-by gas discharged from the opening 121a of the PCV pipe 121 in the internal space 120x of the surge tank 120, and the flow of the intake manifold 11 is obtained as a mixed flow F1. It passes through the passage 110x and is guided to an intake port of a cylinder head (not shown).

  On the other hand, when the blow-by gas travels backward as the backflow F2 due to the generation of negative pressure when the throttle valve 132 is opened and closed and the air pulsation in the flow path 130x and the internal space 120x, the backflow F3 of the mixed flow is generated. The contained oil may deposit as a deposit in the flow path 130x of the throttle body 130 or the throttle valve 132, and the idling may become unstable or the throttle valve 132 may be fixed.

  As a technique for solving such a problem, for example, in Patent Document 1, (1) a rib parallel to the B-C path in the figure is provided in the surge tank 120, and (2) the surge tank 120 and the intake manifold 110 are Steps are provided at the boundary, (3) A part of the gasket that keeps airtightness with the PCV pipe 121 is protruded into the internal space 120x, and the oil contained in the blow-by gas is collected by providing each configuration, A configuration in which the liquid is dropped into the tank is disclosed.

JP 7-259529 A

  However, the above-described prior art engine intake pipe structure has the following problems. In other words, the above configurations (1) to (3) complicate the configuration in the surge tank 120 and increase the cost. Furthermore, the distribution of the intake manifold 110 to each pipe varies due to the provision of the ribs, and it is difficult to reliably collect the oil depending on the flow rate and flow rate of the blow-by gas according to the steps and gaskets. There was a problem.

  The present invention has been made in view of the above-described problems, and provides an engine intake pipe structure capable of suppressing the backflow of blow-by gas with a simple configuration in order to prevent deposits from adhering in the intake pipe structure. The purpose is to do.

  In order to achieve the above object, a first aspect of the present invention includes a surge tank that is located upstream of an intake manifold and downstream of a throttle body and has an opening for a PCV passage formed therein, A partition extending further from the upper wall to the straight line connecting the upper end of the flow path of the throttle body and the upper end of the flow path of the intake manifold is further provided in the tank and downstream of the opening of the PCV passage. The engine intake pipe structure is formed.

  According to another aspect of the present invention, a surge tank is provided upstream of the intake manifold and downstream of the throttle valve, and an air flow that flows through the hold from the throttle valve to the intake plate from the upper wall in the surge tank. It may be an engine intake pipe structure in which a partition wall that extends so as not to interfere with the valve and an opening of a PCV passage located between the partition wall and the intake manifold are formed.

  The present invention as described above has an effect that it is possible to suppress the backflow of blow-by gas with a simple configuration.

Sectional drawing which shows the principal part which shows the structure of the intake pipe structure of the engine which concerns on embodiment of this invention Sectional drawing which shows the principal part which shows the structure of the intake pipe structure of the engine which concerns on embodiment of this invention Sectional drawing of the principal part which shows the other structural example of the intake pipe structure of the engine which concerns on embodiment of this invention Side view showing the configuration of a conventional engine intake pipe structure Plan view showing the configuration of a conventional engine intake pipe structure Sectional view of relevant parts showing the structure of a conventional engine intake pipe structure

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of an essential part corresponding to FIG. 5 and shows a configuration of an intake pipe structure of an engine according to an embodiment of the present invention. FIG. 2 corresponds to a cross-sectional view taken along line BB of FIG. It is principal part sectional drawing. However, the same or corresponding components as those in the conventional example shown in FIGS.

  In FIG. 1, the surge tank 12 is a means for distributing the air from the throttle body 130 to each pipe of the intake manifold 110, like the conventional surge tank 120. Further, the interior of the surge tank 12 is an internal space 12x sandwiched between the partition wall 12b and the PCV pipe 121 by a partition wall 12b extending from the upper wall 12a, and an internal space 12y sandwiched between the partition wall 12b and the opening 130y of the throttle body 130. And an inner space 12z sandwiched between the plane including the edge 12b1 of the partition wall 12b and the lower wall 12c of the surge tank 12. That is, the partition wall 12b is positioned upstream of the opening 121a of the PCV pipe 121 in the air flow referring to the ABCD path in the figure in the surge tank 12.

  The partition wall 12b is a member made of synthetic resin or the like, similar to the case portion of the surge tank 12, and is perpendicular to the AB path in the surge tank 12 as shown in FIG. It reaches the inner wall 12d. The partition wall 12b may be configured to be integrally formed with the surge tank 12 by means such as injection molding, or may be configured to be provided in the completed surge tank 12 as a separate member.

  In the above configuration, the engine intake pipe structure 1 corresponds to the engine intake pipe structure of the present invention, the intake manifold 110 corresponds to the intake manifold of the present invention, and the throttle body 130 corresponds to the throttle body of the present invention. The opening 121a of the PCV pipe 121 corresponds to the opening of the PCV passage of the present invention.

  The intake pipe structure of the engine of this embodiment having such a configuration is located upstream from the opening 121a of the PCV pipe, extends from the upper wall 12a in the surge tank 12 toward the lower wall 12c, and has a surge. A partition 12b formed to intersect the air flow in the tank 12 is provided.

  That is, as shown in FIGS. 1 and 2, in the engine intake pipe structure 1, the inside of the surge tank 12 is partitioned by the partition wall 12b, and the opening 130y of the throttle body 130 is formed in the internal space 12y and the PCV pipe 121. The openings 121a are arranged in the internal space 12x.

  Therefore, the influence of negative pressure or the like generated when the throttle valve 132 is opened / closed mainly affects the internal space 12y. On the other hand, among the blow-by gas discharged from the opening 121a, the flow F2 that travels backward along the B-C path in the figure is the partition wall 12b. And flows into the internal space 12z side. Further, even when oil is discharged, the oil adheres to the partition wall 12b and drops onto the lower wall 12c.

  Thereby, the mixed flow F1 of air and blow-by gas in the surge tank 12 is along the BC path (B-C1 path, B-C2 path, and B-C2 path) in the figure passing through the internal space 12z. It is distributed to each pipe of the intake manifold 110.

  In addition, it is preferable that the extension height from the upper wall 12a of the partition wall 12b is such that the blow-by gas flow F2 does not travel backward along the B-C path in the figure. As an example, the cross-sectional shape of the mixed flow F1 of air and blow-by gas in the surge tank 12 as shown in the extension height H1 shown in FIG. 1 is changed between the upper end of the opening 130y of the throttle body 130 and the opening 110y of the intake manifold 110. The straight line E1 connecting the upper end and the straight line E2 connecting the lower end of the opening 130y and the lower end of the opening 110y are set as the upper and lower ends, respectively, and the dimension reaching the straight line E1 can be set as the upper limit of H1.

  Accordingly, it is possible to suppress the backflow of blow-by gas while reducing the possibility that the partition wall 12b interferes with the mixed flow F1 and hinders the flow to the intake manifold 110.

  Further, as another example, the cross-sectional shape R of the mixed flow F1 of air and blow-by gas in the surge tank 12 as the air flow of the present invention, such as the extension height H2 shown in FIG. The dimension that does not reach the upper end of the cross-sectional shape R may be set as the upper limit of H2. In this case, the effect similar to that of the configuration example shown in FIG. 1 is achieved, and the further effect is achieved that the flow rate of the mixed flow F1 can be optimized.

  Thus, according to the engine intake pipe structure of the present embodiment, it is located upstream from the opening 121a of the PCV pipe, extends from the upper wall 12a in the surge tank 12 toward the lower wall 12c, and surges. By providing the partition wall 12b formed so as to intersect with the air flow in the tank 12, it is possible to suppress the backflow of blow-by gas with a simple configuration.

  However, the present invention is not limited to the above embodiment. In the above description, the partition wall 12b has been described as extending perpendicularly from the upper wall 12a to the lower wall 12c. However, the partition wall 12b may be inclined and extended toward the intake manifold 110. It may be a curved aspect. In short, the partition wall according to the present invention suppresses the backflow of blowby gas caused by the negative pressure generated from the throttle body side, or the flow when blowby gas discharged from the opening 121a as the opening of the PCV passage is backflowed. As long as it extends so that it can interfere, it is not limited by the specific shape.

  Furthermore, in the above description, the present invention has been described as being implemented in an automobile. However, the present invention may be implemented in any transportation equipment such as a motorcycle, a train, a ship, and the like in addition to an automobile. Furthermore, the present invention may be applied to an internal combustion engine such as a diesel engine in addition to a gasoline engine.

  As described above, the present invention is an intake pipe structure of an engine, and includes a surge tank that is located upstream of an intake manifold and downstream of a throttle body and has an opening of a PCV passage formed therein, and A partition extending further from the upper wall to the straight line connecting the upper end of the flow path of the throttle body and the upper end of the flow path of the intake manifold is further provided in the tank and downstream of the opening of the PCV passage. It may be formed as long as it is not limited by other specific purposes, applications, and configurations.

  Therefore, the present invention may be implemented by adding various modifications to the above embodiment, including those described above, as long as they do not depart from the spirit of the present invention.

  The present invention as described above has an effect that it is possible to suppress the backflow of blow-by gas with a simple configuration. For example, in application to an intake pipe structure of an engine mounted on a cylinder head in an automobile engine. Useful.

DESCRIPTION OF SYMBOLS 1 Engine intake pipe structure 110 Intake manifold 12 Surge tank 12a Upper wall 12b Partition 12b1 Edge 12c Lower wall 12d Inner wall 12x, 12y, 12z Inner space 121 PCV pipe 110x, 130x Flow path 110y, 121a, 130y Open 130 Throttle body 131 Valve adjustment part 132 Throttle valve

Claims (1)

A surge tank located upstream of the intake manifold and downstream of the throttle body and having an opening in the PCV passage formed therein;
In the inside of the surge tank and downstream of the opening of the PCV passage,
A partition wall is further formed extending from an upper wall until reaching a straight line connecting the upper end of the flow path of the throttle body and the upper end of the flow path of the intake manifold.
Engine intake pipe structure.

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