JP5814106B2 - Intake manifold - Google Patents

Description

  The present invention relates to an intake manifold provided with a blow-by gas introduction port into which blow-by gas is introduced, and a negative pressure outlet that communicates with a brake booster.

  Conventionally, an intake manifold is provided with a blow-by gas introduction port through which blow-by gas generated in the engine is introduced, and a negative pressure outlet for supplying negative pressure to a brake booster, a pressure switch, and the like.

  Also, an intake device for an internal combustion engine that includes a partition wall between a blow-by gas inlet and a negative pressure outlet is disclosed (see Patent Document 1). According to the intake device of the internal combustion engine, the partition wall portion can prevent the blow-by gas flowing from the blow-by gas inlet from reaching the negative pressure outlet. Therefore, it is possible to prevent the moisture contained in the blow-by gas from freezing and closing the negative pressure outlet.

JP 2003-254178 A

  However, in the intake device for an internal combustion engine described in Patent Document 1, the flow of intake air from the throttle body toward the engine room is hindered by the partition wall, and thus pressure loss occurs.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an intake manifold that can prevent the negative pressure outlet from being blocked without obstructing the flow of intake air.

  In order to solve the above problems, an intake manifold according to the present invention is configured as follows.

That is, the intake manifold according to the present invention includes an intake air introduction portion, a surge tank portion, and a plurality of intake passage formation portions arranged corresponding to each cylinder, and intake air introduced from the intake air introduction portion, A blow-by gas introduction port through which blow-by gas is introduced into the surge tank unit, and a negative pressure extraction port communicating with the brake booster , while flowing to each intake passage forming unit via the surge tank unit DOO is a intake manifold formed respectively, wherein the surge tank, it said has blow-by gas is provided with a first regulating member for preventing from reaching the negative pressure outlet port, the first regulating member The position of one edge of the intake tank is such that the flow direction of the intake air flowing into the surge tank portion from the intake introduction portion is within the surge tank portion. It is a position on the downstream side of the intake flow with respect to the upstream end position of the region that is a flow in the direction along the arrangement direction of the forming portions, and each of the blow-by gas inlet and the negative pressure outlet in this direction The first restricting member is located upstream of the formation position, and the first regulating member is formed with a region where the blow-by gas inlet is formed and the negative pressure outlet from the position of the one end edge. It is characterized by extending along the intake flow direction so as to divide the region .

  According to the intake manifold having such a configuration, the blow-by gas is prevented from reaching the negative pressure outlet by the first restricting member, so that the negative pressure outlet can be prevented from being blocked. Further, since the first restricting member is formed along the flow of the intake air flowing into the intake manifold, it is possible to avoid the intake flow from being obstructed by the first restricting member.

  Further, in the intake manifold according to the present invention, it is preferable that the negative pressure outlet is disposed downstream of the blow-by gas inlet in the flow of the intake air.

  According to the intake manifold having such a configuration, since the negative pressure outlet is disposed downstream of the blow-by gas inlet in the flow of the intake air, a stable negative pressure is obtained from the negative pressure outlet. It can be taken out. In addition, since the blow-by gas introduction port is disposed upstream in the flow of the intake air, the blow-by gas flowing in from the blow-by gas introduction port can be delivered to each cylinder substantially evenly.

  In the intake manifold according to the present invention, the first regulating member is a flat plate member that divides a region where the blow-by gas inlet is formed and a region where the negative pressure outlet is formed. It is preferable.

  According to the intake manifold having such a configuration, the first restricting member is a flat plate member that divides a region where the blow-by gas inlet is formed and a region where the negative pressure outlet is formed. Therefore, the first restricting member can be realized with a simple configuration.

  In the intake manifold according to the present invention, the first restricting member is protruded into the intake air flow path, with a base end portion of the first restricting member connected to a wall surface in the vicinity of the formation position of the negative pressure outlet. It is preferable to be formed.

  According to the intake manifold having such a configuration, the first restriction member has a proximal end portion of the first restriction member connected to a wall surface in the vicinity of the formation position of the negative pressure outlet and protrudes into the intake flow path. Therefore, the rigidity of the portion of the intake manifold to which the first restricting member is connected can be increased.

  In the intake manifold according to the present invention, a second regulating member that prevents the blow-by gas from reaching the negative pressure taking-out port is interposed between the negative pressure taking-out port and the first regulating member. It is preferable.

  According to the intake manifold having such a configuration, the blow-by gas can reach the negative pressure outlet by the second restricting member interposed between the negative pressure outlet and the first restricting member. Since it is blocked, it is possible to reliably prevent the negative pressure outlet from being blocked.

  In the intake manifold according to the present invention, it is preferable that the second restricting member is a plate-like member erected on the upstream side with respect to the flow of the intake air at the position where the negative pressure outlet is disposed.

  According to the intake manifold having such a configuration, since the second restricting member is a plate-like member erected on the upstream side with respect to the flow of the intake air at the position where the negative pressure outlet is disposed, the simplified configuration Thus, the second restricting member can be realized.

  Further, the intake manifold according to the present invention is provided with an inflow prevention member for preventing inflow of moisture contained in the blowby gas flowing in from the blowby gas introduction port into the intake flow in the vicinity of the blowby gas introduction port. It is preferable that

  According to the intake manifold having such a configuration, the inflow of moisture contained in the blowby gas flowing in from the blowby gas introduction port into the flow of the intake air is caused by the inflow prevention member disposed in the vicinity of the blowby gas introduction port. Therefore, the negative pressure outlet can be more reliably prevented from being blocked.

  Further, in the intake manifold according to the present invention, the inflow blocking member is erected on the downstream side of the flow of blow-by gas flowing from the blow-by gas introduction port, and is disposed in a direction orthogonal to the flow direction of the blow-by gas. A wall-like member is preferable.

  According to the intake manifold having such a configuration, the inflow blocking member is erected on the downstream side of the flow of blow-by gas flowing from the blow-by gas introduction port, and is disposed in a direction orthogonal to the flow direction of the blow-by gas. Since it is a wall-shaped member, the inflow blocking member can be realized with a simple configuration.

  According to the intake manifold according to the present invention, the blow-by gas is prevented from reaching the negative pressure outlet by the first restricting member, so that the negative pressure outlet can be prevented from being blocked. Further, since the first restricting member is formed along the flow of the intake air flowing into the intake manifold, it is possible to avoid the intake flow from being obstructed by the first restricting member.

It is a front view which shows an example of the intake manifold which concerns on this invention. It is a block diagram which shows an example of the connection state of the blowby gas inlet and engine shown in FIG. It is a block diagram which shows an example of the connection state of the negative pressure taking-out port and brake booster shown in FIG. It is a side view of the intake manifold shown in FIG. It is a rear view of the intake manifold shown in FIG. It is AA sectional drawing of the intake manifold shown in FIG. It is BB sectional drawing of the intake manifold shown in FIG. It is CC sectional drawing of the intake manifold shown in FIG. It is DD sectional drawing of the intake manifold shown in FIG. It is a figure which shows an example at the time of adding the 2nd control member in AA sectional drawing of the intake manifold shown in FIG. It is a figure which shows an example of the ZZ cross section of the intake manifold shown in FIG.

  Hereinafter, an embodiment of an intake manifold 100 according to the present invention will be described with reference to the drawings.

-Overall structure of intake manifold-
First, the overall structure of the intake manifold according to the present invention will be described with reference to FIGS. FIG. 1 is a front view showing an example of an intake manifold 100 according to the present invention. FIG. 5 is a rear view of the intake manifold 100 shown in FIG. As shown in FIGS. 1 and 5, the intake manifold 100 includes an intake air introduction portion 10, an intake passage formation portion 1, a blow-by gas introduction port 2, a negative pressure outlet 3, and a surge tank portion 4.

  The intake air introduction part 10 is an opening through which the intake air supplied via the throttle valve 64 (see FIG. 2) flows into the surge tank part 4.

  The intake passage forming unit 1 is an intake path for supplying the intake air drawn from the intake air introduction unit 10 to the engine 6 via the surge tank unit 4 (see FIG. 5). In the present embodiment, since the engine 6 includes four cylinders (A cylinder to D cylinder) (see FIG. 3), the intake passage forming unit 1 takes intake air into the A cylinder to D cylinder of the engine 6, respectively. An intake passage forming portion 1A to an intake passage forming portion 1D to be supplied are provided.

  The blow-by gas introduction port 2 is an opening through which blow-by gas generated in the engine 6 is introduced into the surge tank portion 4 (see FIG. 5) of the intake manifold 100. A connection mode between the blow-by gas inlet 2 and the engine 6 will be described later with reference to FIG. Here, the blowby gas is an unburned air-fuel mixture, for example, an air-fuel mixture leaked from the gap between the piston 6b (see FIG. 2) of the engine 6 and the cylinder.

  The negative pressure outlet 3 is an opening for extracting negative pressure, and the extracted negative pressure is supplied to a brake booster 72 (see FIG. 3). A connection mode between the negative pressure outlet 3 and the brake booster 72 will be described later with reference to FIG. In addition, although this embodiment demonstrates the case where the negative pressure extraction opening 3 is connected to the brake booster 72, the form connected to a pressure switch, a negative pressure pump, etc. may be sufficient.

  The surge tank unit 4 is a tank that temporarily stores the intake air sucked from the intake air introduction unit 10, and the intake air stored in the surge tank unit 4 passes through the intake passage forming unit 1 to each of the engines 6. Supplied to cylinders (A cylinder to D cylinder).

  Next, with reference to FIG. 2, the structure of the engine 6, the path through which blow-by gas is supplied from the engine 6 to the blow-by gas inlet 2, and the like will be described. FIG. 2 is a configuration diagram illustrating an example of a connection state between the blow-by gas introduction port 2 and the engine 6 illustrated in FIG. 1.

-Engine-
First, the structure of the engine 6 will be described with reference to FIG. The engine 6 is, for example, a multi-cylinder (here, four-cylinder) gasoline engine, and includes a piston 6b that forms a combustion chamber 6a, and a crankshaft 65 that is an output shaft. The piston 6b is connected to the crankshaft 65 through a connecting rod 66. Further, the reciprocating motion of the piston 6 b is converted into the rotational motion of the crankshaft 65 by the connecting rod 66.

  A spark plug 63 is disposed in the combustion chamber 6 a of the engine 6. The ignition timing of the spark plug 63 is adjusted by an igniter (not shown). An intake passage and an exhaust passage are connected to the combustion chamber 6 a of the engine 6. An intake valve 61 is provided between the intake passage and the combustion chamber 6a. By opening and closing the intake valve 61, the intake passage and the combustion chamber 6a are communicated or blocked. An exhaust valve 62 is provided between the exhaust passage and the combustion chamber 6a. By opening and closing the exhaust valve 62, the exhaust passage and the combustion chamber 6a are communicated or blocked.

  A throttle valve 64 and the like are disposed in the intake passage of the engine 6. Here, the throttle valve 64 adjusts the intake air amount of the engine 6. An injector (fuel injection valve) 67 is disposed in the intake passage. Fuel (in this case, gasoline) is supplied to the injector 67 from a fuel tank by a fuel pump, and the fuel is injected into the intake passage by the injector 67. The injected fuel is mixed with intake air to form an air-fuel mixture and introduced into the combustion chamber 6 a of the engine 6. The air-fuel mixture (fuel + air) introduced into the combustion chamber 6a is ignited by the spark plug 63 and burns and explodes. When the air-fuel mixture burns and explodes in the combustion chamber 6a, the piston 6b reciprocates in the vertical direction in the figure, and the crankshaft 65 is rotationally driven.

-Blowby gas inlet-
Next, a path through which blowby gas is supplied from the engine 6 to the blowby gas inlet 2 will be described. A head cover 68 is disposed above the engine 6 (above the cylinder head formed above the cylinder block 6c shown in FIG. 2). In the blow-by gas chamber formed in the head cover 68, unburned air-fuel mixture leaked from the combustion chamber 6a or the like, that is, “blow-by gas” is stored.

  The blow-by gas chamber formed in the head cover 68 is provided with a PCV valve 8, and the blow-by gas discharged from the PCV valve 8 passes through the blow-by gas passage 81 to the blow-by gas inlet 2 of the intake manifold 100. Supplied.

  A PCV (Positive Crankcase Ventilation) valve 8 is provided inside the head cover 68 (blowby gas chamber) on the upstream side of the blowby gas passage 81 and on the intake downstream side of the throttle valve 64 on the downstream side of the blowby gas passage 81 (here, It is a valve | bulb which functions as a differential pressure | voltage operating valve which operate | moves according to differential pressure | voltage with the inside of the surge tank part 4 shown in FIG. That is, the flow rate of the blow-by gas that is recirculated into the intake air via the blow-by gas passage 81 is adjusted by the PCV valve 8 according to the differential pressure.

-Negative pressure outlet-
Next, with reference to FIG. 3, the connection aspect of the negative pressure outlet 3 and the brake booster 72 is demonstrated. FIG. 3 is a configuration diagram showing an example of a connection state between the negative pressure outlet 3 and the brake booster 72 shown in FIG. First, the configuration of the brake device 7 will be described with reference to FIG. The brake device 7 includes a brake pedal 71, a brake booster (negative pressure operating device) 72, a master cylinder 73, a check valve 74, and the like.

  The brake pedal 71 is a pedal that is depressed by the driver to brake the vehicle, and is connected to an unillustrated input rod of the brake booster 72. The brake booster 72 is a device that generates an assist force proportional to the pedal effort applied to the brake pedal 71, and a negative pressure chamber (not shown) is provided on the master cylinder 73 side.

  The brake booster 72 includes an output rod, and this output rod is connected to the input shaft of the master cylinder 73. The master cylinder 73 generates hydraulic pressure according to the acting force from the brake booster 72 that has obtained the assist force in addition to the pedal depression force. The master cylinder 73 is connected to a wheel cylinder provided in the disc brake mechanism of each wheel via a hydraulic circuit, and the wheel cylinder generates a braking force by the hydraulic pressure supplied from the master cylinder 73.

  Here, a vacuum pipe 3 a communicating with the negative pressure outlet 3 of the intake manifold 100 is connected to the negative pressure chamber of the brake booster 72, and a check valve 74 is connected to a connection portion of the vacuum pipe 3 a to the negative pressure chamber. Is arranged. The check valve 74 is configured such that the absolute value of the negative pressure (intake pipe negative pressure) of the intake manifold 100 (specifically, the surge tank portion 4) is greater than the negative pressure (absolute value) of the negative pressure chamber of the brake booster 72. Open when large. As a result, negative pressure is accumulated in the negative pressure chamber of the brake booster 72.

-First restriction member-
Next, the configuration of the intake manifold 100 will be described with reference to FIGS. FIG. 4 is a side view of the intake manifold 100 shown in FIG. 4A is a left side view of the intake manifold 100 shown in FIG. 1, and FIG. 4B is a right side view of the intake manifold 100 shown in FIG. As shown in FIG. 4, the intake manifold 100 includes a resin molded product (generally, the left side of the AA cross section of FIG. 4B) that constitutes the intake passage formation portion 1 and a resin molding that constitutes the surge tank portion 4. The product (generally, the right side of the AA cross section in FIG. 4B) is joined to the product.

  FIG. 5 is a rear view of the intake manifold 100 shown in FIG. As shown in FIG. 5, the engine 6 is connected to four cylinders (A cylinder to D cylinder) for each of the intake passage forming portion 1A to the intake passage forming portion 1D constituting the intake passage forming portion 1. Portions 11A to 11D (hereinafter collectively referred to as “engine connection portion 11”) are formed in an oval shape.

  FIG. 6 is a cross-sectional view of the intake manifold shown in FIG. 4 taken along the line AA. FIG. 7 is a cross-sectional view of the intake manifold shown in FIG. As shown in FIGS. 6 and 7, a first regulating member 41 that prevents the blow-by gas flowing out from the blow-by gas inlet 2 from reaching the negative pressure outlet 3 is erected on the inner wall surface of the surge tank portion 4. Has been.

  Here, arrows V <b> 1 and V <b> 2 shown in FIG. 6 indicate the direction of the flow of the intake air flowing into the surge tank unit 4. Arrow V1 indicates the direction of the flow of intake air flowing in at high speed, and arrow V2 indicates the direction of the flow of intake air flowing in at low speed. An arrow V3 shown in FIG. 7 indicates the direction of the flow of intake air flowing from the surge tank portion 4 into the intake passage forming portion 1. Furthermore, the arrow W shown in FIG. 6 indicates the direction of the flow of blow-by gas flowing into the surge tank portion 4 via the blow-by gas inlet. As indicated by an arrow W in FIG. 6, the blow-by gas is prevented from reaching the negative pressure outlet 3 by the first regulating member 41, so that the negative pressure outlet 3 can be prevented from being blocked.

  Further, as shown in FIGS. 6 and 7, the blow-by gas inlet 2 and the negative pressure outlet 3 are formed with a blow-by gas opening 21 and a negative pressure opening 31 on the inner wall surface of the surge tank 4, respectively. ing.

  As shown in FIG. 6, the first restricting member 41 is formed along the flow of intake air (intake flow indicated by arrows V <b> 1 and V <b> 2 shown in FIG. 6) flowing into the surge tank portion 4 of the intake manifold 100. . In addition, the first regulating member 41 has an inside of the surge tank portion 4 in the region where the blow-by gas inlet 2 (more precisely, the blow-by gas opening 21) is formed and the negative pressure outlet 3 (more precisely, , A flat plate member that is divided into a region where the negative pressure opening 31) is formed.

  Further, as shown in FIG. 6, the negative pressure outlet 3 (more precisely, the negative pressure opening 31) is more downstream in the flow of intake air than the blowby gas inlet 2 (more precisely, the blowby gas opening 21). It is arranged on the side.

  As described above, the first restricting member 41 is formed along the flow of intake air (intake flow indicated by arrows V1 and V2 in FIG. 6) flowing into the intake manifold 100 (more precisely, the surge tank portion 4). Therefore, the flow of the intake air can be prevented from being hindered by the first restricting member 41.

  Further, as described above, the negative pressure outlet 3 (exactly, the negative pressure opening 31) has a flow of intake air (refer to FIG. 6) more than the blowby gas inlet 2 (exactly, the blowby gas opening 21). Since it is disposed downstream in the flow of intake air indicated by arrows V1 and V2 shown, a stable negative pressure can be taken out from the negative pressure outlet 3. Further, since the blow-by gas inlet 2 (more precisely, the blow-by gas opening 21) is disposed upstream in the flow of intake air (intake flow indicated by arrows V1 and V2 in FIG. 6), the blow-by gas The blow-by gas that has flowed into the surge tank portion 4 from the inlet 2 (more precisely, the blow-by gas opening portion 21) passes through the intake passage formation portion 1A to the intake passage formation portion 1D, and is connected to each cylinder (here Then, it can be delivered almost evenly to A cylinder to D cylinder (see FIG. 3).

  Further, as described above, the first regulating member 41 is an area where the blow-by gas inlet 2 (more precisely, the blow-by gas opening 21) is formed (an area below the first regulating member 41 in FIG. 6). ) And a region where the negative pressure outlet 3 (precisely, the negative pressure opening 31) is formed (the region on the upper side of the first regulating member 41 in FIG. 6). The first restricting member 41 that can prevent the blow-by gas from reaching the negative pressure outlet 3 can be realized with a simple configuration.

  In the present embodiment, the first regulating member 41 includes a region where the blow-by gas inlet 2 (more precisely, the blow-by gas opening 21) is formed, and a negative pressure outlet 3 (more precisely, the negative pressure opening). Although the case where it is a flat member which divides | segments the area | region in which 31) is formed is demonstrated, a 1st control member may be another aspect. For example, the 1st control member may be formed in the inside of the surge tank part 4, and the form which is a plate-shaped member which prevents blowby gas from reaching | attaining the negative pressure outlet 3 may be sufficient. In this case, it is preferable that the first regulating member is formed in a curved surface along the flow of the intake air flowing into the surge tank portion 4 from the intake air introduction portion 10.

  8 is a cross-sectional view taken along the line CC of the intake manifold shown in FIG. 5, and FIG. 9 is a cross-sectional view taken along the line DD of the intake manifold shown in FIG. FIG. 8 is a cross-sectional view of the intake manifold shown in FIG. 5 taken along a plane including the negative pressure outlet 3. FIG. 9 is a cross-sectional view of the intake manifold shown in FIG. 5 taken along a plane including the blow-by gas opening 21 of the blow-by gas introduction port 2.

  8, cross sections 12A to 12D are CC cross sections of the intake passage forming portion 1A to the intake passage forming portion 1D, respectively. Similarly, in FIG. 9, cross sections 13A to 13D are DD cross sections of the intake passage forming portion 1A to the intake passage forming portion 1D, respectively.

  With reference to FIGS. 5, 8, and 9, the blow-by gas inlet 2 (more precisely, the blow-by gas opening 21) is formed inside the surge tank portion 4 by the first regulating member 41. It can be seen that the area is divided into an area (area shown in FIG. 9) and an area (area shown in FIG. 8) in which the negative pressure outlet 3 (exactly, the negative pressure opening 31) is formed.

  Further, as shown in FIG. 8, the first regulating member 41 has a base end connected to the inner wall surface of the surge tank portion 4 in the vicinity of the position where the negative pressure opening 31 of the negative pressure outlet 3 is formed. In addition, it is formed to protrude into the intake air flow path in the surge tank portion 4.

  Thus, the first regulating member 41 is connected to the inner wall surface of the surge tank part 4 in the vicinity of the position where the negative pressure opening 31 of the negative pressure outlet 3 is formed, and the surge tank part 4 In the intake manifold 100, the portion of the intake manifold 100 to which the first restricting member 41 is connected (the negative pressure opening 31 of the negative pressure outlet 3 of the surge tank portion 4 is disposed). The rigidity of the portion) can be increased.

  In the present embodiment, the case where the first restricting member 41 is formed so as to protrude into the intake passage in the surge tank portion 4 will be described. However, the first restricting member 41 is the intake passage in the surge tank portion 4. Alternatively, both ends of the first restricting member may be connected to the surge tank portion 4 so as to partition the first tank. In this case, the rigidity of the portion to which the first restricting member is connected can be further increased.

-Second regulating member-
Next, the second regulating member 5 will be described with reference to FIG. FIG. 10 is a view showing an example of the case where the second restriction member 5 is added in the AA cross-sectional view of the intake manifold shown in FIG. 6. An intake manifold 100A shown in FIG. 10 is obtained by adding a second regulating member 5 to the intake manifold 100 described with reference to FIGS.

  The second regulating member 5 is configured so that blow-by gas that has flowed into the surge tank portion 4 from the blow-by gas introduction port 2 (more precisely, the blow-by gas opening 21) flows into the negative pressure outlet 3 (more precisely, the negative pressure opening 31). ), And is interposed between the negative pressure outlet 3 (more precisely, the negative pressure opening 31) and the first regulating member 41.

  Further, the second restricting member 5 is a flow of intake air in the surge tank portion 4 at the position where the negative pressure outlet 3 (more precisely, the negative pressure opening portion 31) is disposed (a flow from the right side to the left side in FIG. 10). ) Is a plate-like member erected on the upstream side. Specifically, the second regulating member 5 is a plate-like member erected on the inner wall surface of the surge tank portion 4 so as to surround the upstream side of the negative pressure opening 31.

  As described above, the blow-by gas is discharged from the negative pressure outlet 3 by the second regulating member 5 interposed between the negative pressure outlet 3 (more precisely, the negative pressure opening 31) and the first regulating member 41. 3 (precisely, the negative pressure opening 31) is prevented from reaching, so that the negative pressure outlet 3 can be reliably prevented from being blocked.

  Further, the second restricting member 5 has a flow of intake air in the surge tank portion 4 at a position where the negative pressure outlet 3 (more precisely, the negative pressure opening 31) is disposed (a flow from the right side to the left side in FIG. 10). ) Is a plate-like member erected on the upstream side, so that the second configuration prevents the blow-by gas from reaching the negative pressure outlet 3 (more precisely, the negative pressure opening 31) with a simple configuration. The regulating member 5 can be realized.

  In the present embodiment, the second restricting member 5 has a flow of intake air in the surge tank portion 4 at the position where the negative pressure outlet 3 (more precisely, the negative pressure opening 31) is disposed (in FIG. 10, from the right side to the left side). In the second flow, the blow-by gas reaches the negative pressure outlet 3 (more precisely, the negative pressure opening 31). What is necessary is just an aspect which prevents doing. For example, the cylindrical member may be erected on the inner wall surface of the surge tank portion 4 so that the second regulating member surrounds the periphery of the negative pressure opening 31.

-Inflow prevention member-
Next, the inflow blocking member 211 will be described with reference to FIG. FIG. 11 is a diagram showing an example of a ZZ cross section of the intake manifold 100 shown in FIG. An intake manifold 100B shown in FIG. 11 is obtained by adding an inflow blocking member 211 to the intake manifold 100 described with reference to FIGS.

  FIG. 11 is a cross-sectional view taken along a plane including the blow-by gas opening 21 of the blow-by gas inlet 2. As shown in FIG. 11, in the vicinity of the blow-by gas inlet 2 (more precisely, the blow-by gas opening 21), the moisture contained in the blow-by gas flowing from the blow-by gas inlet 2 is sucked into the surge tank 4. An inflow prevention member 211 is provided to prevent inflow into the flow (in FIG. 10, the flow from the right side to the left side).

  Further, as shown in FIG. 11, the inflow blocking member 211 is erected on the downstream side of the flow of blow-by gas flowing in from the blow-by gas introduction port 2 indicated by arrow V4 in FIG. 11, and the flow direction of the blow-by gas (see FIG. 11). 11 is a wall-like member disposed in a direction orthogonal to the direction of arrow V4).

  As described above, the inflow blocking member 211 disposed in the vicinity of the blow-by gas inlet 2 (more precisely, the blow-by gas opening 21) removes moisture contained in the blow-by gas flowing from the blow-by gas inlet 2. Since the inflow of the intake air into the surge tank portion 4 is blocked, the negative pressure outlet 3 can be more reliably prevented from being blocked.

  Further, the inflow blocking member 211 is erected on the downstream side of the flow of blow-by gas flowing in from the blow-by gas introduction port 2 indicated by arrow V4 in FIG. 11, and the flow direction of the blow-by gas (the direction of arrow V4 in FIG. 11). Since the wall-shaped member is disposed in a direction orthogonal to the inflow direction, the inflow blocking member 211 that blocks the inflow of the moisture contained in the blow-by gas into the intake air flow in the surge tank portion 4 is realized with a simple configuration. Can do. That is, when the blow-by gas collides with the inflow blocking member 211, the moisture contained in the blow-by gas remains in the blow-by gas inlet 2, so that the moisture contained in the blow-by gas enters the surge tank portion 4. Inflow can be prevented.

  In the present embodiment, the case where the inflow blocking member 211 is a wall-like member disposed in a direction orthogonal to the flow direction of blowby gas (the direction of the arrow V4 in FIG. 11) has been described. Any mode may be employed as long as moisture contained in the blow-by gas is prevented from flowing into the intake air flow in the surge tank unit 4. For example, the inflow blocking member may be provided with a filter that removes moisture contained in the blowby gas flowing from the blowby gas inlet 2.

-Other embodiments-
In the present embodiment, the case where blow-by gas flows into the blow-by gas introduction port 2 via the PCV valve 8 disposed in the head cover 68 of the engine 6 and the blow-by gas passage 81 has been described. The blow-by gas may be introduced into the introduction port 2 through another route.

In the present embodiment, the case where there is one negative pressure outlet 3 has been described. However, a plurality of negative pressure outlets may be formed.

  In the present embodiment, the case where the engine 6 includes four cylinders (A cylinder to D cylinder) has been described. However, the engine 6 may be configured to include a plurality of cylinders. Note that the number of intake passages in the intake passage forming portion 1 is the same as the number of cylinders of the engine 6.

  INDUSTRIAL APPLICABILITY The present invention can be used for an intake manifold that includes a blow-by gas introduction port into which blow-by gas is introduced and a negative pressure outlet that communicates with a brake booster.

100, 100A, 100B Intake manifold 1 Intake passage forming portion 10 Intake introduction portion 11 Engine connection portion 2 Blow-by gas introduction port 21 Blow-by gas opening portion 3 Negative pressure outlet 31 Negative pressure opening portion 4 Surge tank portion 41 First regulating member 5 Second regulating member 6 Engine 7 Brake device 72 Brake booster 8 PCV valve

Claims (8)

An intake air introduction portion, a surge tank portion, and a plurality of intake passage forming portions arranged corresponding to each cylinder, and the intake air introduced from the intake air introduction portion is passed through the surge tank portion together so that the flow to the air intake passage defining portion, the surge tank, and the blow-by gas inlet blow-by gas is introduced, there in the intake manifold negative pressure outlet port are formed respectively communicating with the brake booster And
The surge tank portion includes a first regulating member that prevents the blow-by gas from reaching the negative pressure outlet ,
The position of one end edge of the first restricting member is such that the flow direction of the intake air flowing into the surge tank portion from the intake air introduction portion is a flow along the arrangement direction of the intake passage forming portions in the surge tank portion. A position on the downstream side of the intake flow with respect to the upstream end position of the region, and in this direction, located on the upstream side of the intake flow with respect to the formation positions of the blow-by gas introduction port and the negative pressure extraction port, respectively. And
The first restricting member extends along the intake flow direction so as to partition a region where the blow-by gas inlet is formed and a region where the negative pressure outlet is formed from the position of the one end edge. Intake manifold characterized by extending . Intake manifold according to claim 1,
The intake manifold is characterized in that the negative pressure outlet is disposed downstream of the blow-by gas inlet in the flow of the intake air. Intake manifold according to claim 1 or claim 2,
The intake manifold according to claim 1, wherein the first restricting member is a flat plate member that divides a region where the blow-by gas inlet is formed and a region where the negative pressure outlet is formed. Intake manifold according to claim 3,
The first restricting member is formed such that a base end portion of the first restricting member is connected to a wall surface in the vicinity of the formation position of the negative pressure outlet and protrudes into the intake air flow path. Intake manifold. The intake manifold according to any one of claims 1 to 4,
An intake manifold, wherein a second regulating member that prevents the blow-by gas from reaching the negative pressure taking-out port is interposed between the negative pressure taking-out port and the first regulating member. Intake manifold according to claim 5,
2. The intake manifold according to claim 1, wherein the second restricting member is a plate-like member erected on the upstream side with respect to the flow of the intake air at the position where the negative pressure outlet is disposed. The intake manifold according to any one of claims 1 to 6,
An intake manifold is provided in the vicinity of the blow-by gas introduction port, and an inflow blocking member for preventing inflow of moisture contained in the blow-by gas flowing in from the blow-by gas introduction port into the flow of the intake air is provided. . Intake manifold according to claim 7,
The inflow prevention member is a wall-like member that is provided on the downstream side of the flow of blow-by gas flowing in from the blow-by gas inlet and is disposed in a direction orthogonal to the flow direction of the blow-by gas. Intake manifold to be used.

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