JP5610217B2 - Intake device for internal combustion engine - Google Patents

Description

  The present invention has an intake manifold main body, a head piece in which a plurality of intake openings are arranged in parallel, and a tunnel-like intake flow path corresponding to each of the plurality of intake openings, and relative rotation with the head piece The present invention relates to an intake device for an internal combustion engine including a rotary valve body that changes an opening area of the intake flow path with respect to the intake opening.

Patent Document 1 describes a conventional intake device for an internal combustion engine, and includes an intake manifold main body, a head piece in which a plurality of intake openings are arranged in parallel, and a tunnel-like intake flow path corresponding to each of the plurality of intake openings. And a rotary valve body that changes the opening area of the intake passage relative to the intake opening by relative rotation with the headpiece.
Patent Document 2 describes an EGR device for a supercharged engine in which an exhaust gas supply nozzle is provided inside an intake passage to an intake manifold body in order to supply exhaust gas to intake air.
Patent Document 3 discloses an internal combustion engine including an EGR device in which an exhaust gas outlet is provided in a butterfly valve body that adjusts an intake air flow rate in an intake passage, and a closed portion that closes the exhaust gas outlet is provided in the intake passage when the valve body is fully opened. An engine intake system is described.

JP 2005-54603 A Japanese Patent No. 3923665 JP 2009-275604 A

For this reason, in the intake device for an internal combustion engine described in Patent Document 1, in order to supply gas such as exhaust gas and blow-by gas from the engine or evaporation gas in the fuel tank to the intake air, as described in Patent Document 2, If a gas supply nozzle is provided inside the intake passage to the intake manifold body, the intake resistance (pressure loss) increases, and the engine performance may be deteriorated.
In addition, deposits contained in the gas may accumulate on the rotary valve body or the like, causing a malfunction of the rotary valve body.
In the intake device for an internal combustion engine described in Patent Document 1, in order to supply gas to the intake air, as described in Patent Document 3, a gas outlet is provided in a butterfly valve body that adjusts the intake air flow rate of the intake passage, If a closing part that closes the gas outlet when the valve body is fully opened is provided in the intake passage, the gas outlet is closed when the valve body is fully opened during high-speed rotation of the engine. There is a possibility that gas cannot be supplied with good response.
Further, when the intake pressure becomes high, there is a possibility that the gas or the intake air flows backward from the gas outlet into the gas supply path and the gas cannot be supplied to the intake air.
The present invention has been made in view of the above circumstances, and provides an intake device for an internal combustion engine that is less likely to increase the intake resistance or deposit on the rotary valve body when supplying gas to the intake air. For the purpose.

  A first characteristic configuration of the present invention includes an intake manifold main body, a head piece in which a plurality of intake openings are arranged in parallel, and a tunnel-like intake flow path corresponding to each of the plurality of intake openings. A rotary valve body that changes an opening area of the intake flow path with respect to the intake opening by relative rotation with a piece, and the rotary valve body at a position that does not interfere with the intake flow path within the rotary valve body A gas supply path is formed along the rotation axis of the gas, and the gas supplied from the gas supply path circulates on the outer peripheral surface of the rotary valve body, and then merges downstream of each intake flow path. As described above, the gas outlet is formed on the outer peripheral surface of the rotary valve body.

The intake device for an internal combustion engine of the present configuration has a gas supply path formed along the rotation axis of the rotary valve body at a position not interfering with the intake flow path in the rotary valve body, and the rotary valve body A gas outlet is formed on the outer peripheral surface of the.
For this reason, it is possible to supply gas to the intake air without providing a gas supply nozzle that causes an increase in the intake resistance in the intake flow path.
Further, gas outlets are formed so that the gas supplied from the gas supply passages flows on the outer peripheral surface of the rotary valve body and then joins downstream of each intake passage.
For this reason, the gas supplied from the gas supply passage can be supplied to the intake air downstream of the intake passage so that the deposit does not accumulate on the rotary valve body or the like.
Therefore, with the intake device for an internal combustion engine of this configuration, there is little possibility that the intake resistance increases or deposits accumulate on the rotary valve body or the like when supplying gas to the intake air.

  In the second characteristic configuration of the present invention, a gap communicating with the intake manifold body is formed between the outer peripheral surface of the rotary valve body and the head piece, and the gas outlet is formed so as to face the gap. In the point.

With this configuration, the intake air in the intake manifold main body can be discharged at a high speed toward the downstream side of the intake flow path through the gap between the outer peripheral surface of the rotary valve body and the head piece.
For this reason, the gas in the gas supply path can be smoothly discharged so as to be sucked out from the gas outlet formed so as to face the gap due to the pressure drop of the intake air in the gap.

  A third characteristic configuration of the present invention is that a valve body capable of preventing a backflow of gas from the gas outlet to the gas supply path is provided.

With this configuration, when the intake pressure during high-speed engine rotation is higher than the pressure in the gas supply path, it is possible to prevent the backflow of gas and the inflow of intake air into the gas supply path. Can do.
For this reason, when the intake pressure is lower than the pressure in the gas supply path, such as when the engine is moving from high speed to low speed, the valve body opens and gas that is not mixed with intake air is highly responsive. The gas supply control becomes easy.

  A fourth characteristic configuration of the present invention is that the gas inlet of the gas supply path faces a gas introduction space formed in an annular shape around the rotation axis at the end in the rotation axis direction of the rotary valve body. is there.

  If it is this structure, gas can be reliably introduce | transduced into a gas supply path irrespective of the rotation phase with respect to the head piece of a rotary valve body.

It is a perspective view of an intake manifold (intake device for internal combustion engines). It is a front view of an intake manifold. It is a perspective view of a rotary valve body. It is a perspective view of the state which separated the head piece, the rotary valve body, and the bore piece. It is the VV sectional view taken on the line in FIG. It is the VI-VI sectional view taken on the line in FIG. It is sectional drawing which shows when a valve body part exists in a micro valve opening position. It is sectional drawing which shows when a valve body part exists in a fully open position. It is a perspective view which shows the attachment state of a non-return valve body. It is sectional drawing which follows the rotating shaft center direction of the rotary valve which shows 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 to 9 show an intake device for an internal combustion engine according to the present invention, specifically, an intake manifold of an automobile four-cylinder engine. The present invention may be an intake device for an internal combustion engine for a six-cylinder engine, for example, and is not limited to the number of cylinders of the internal combustion engine.
The intake manifold is assembled between a throttle body (not shown) and a cylinder head of the engine.

  As shown in FIG. 1 and FIG. 2, the intake manifold is made of resin in which a resin intake manifold body (surge tank) 1 having a throttle port 1a and four intake openings 3 corresponding to each cylinder are arranged in parallel. The head piece 2, the rotary valve 5, and an exhaust gas recirculation supply passage 6 for an exhaust gas recirculation device (EGR) that supplies exhaust gas from an engine as an example of gas to the intake air.

As shown in FIG. 3, the rotary valve 5 has a tunnel-like intake passage 15 that corresponds to each of the four intake openings 3 and communicates with the intake manifold body 1, and rotates relative to the headpiece 2. Thus, four valve body parts 4 that change the opening area of the intake flow path 15 with respect to each intake opening 3 are arranged in parallel in the direction of the rotation axis X.
FIG. 2 shows a state in which the valve body portion 4 of the rotary valve 5 is in a minute valve opening position described later.

  The intake manifold supplies air supercharged by a turbocharger or a supercharger (not shown) to the intake manifold main body 1 through the throttle port 1a, and supplies it to each cylinder of the engine through each intake opening 3.

  As shown in FIGS. 4 and 5, the rotary valve 5 includes a resin rotary valve body 8 between the bore piece 7 and the head piece 2 assembled on the intake outlet side of the intake manifold body 1 and the electric motor 8a. It is supported around the rotation axis X by driving so as to be freely rotatable.

  As shown in FIG. 5, the rotary valve body 8 is assembled in advance so as to be sandwiched between the bore piece 7 and the head piece 2, so that the rotary valve 5 can be easily assembled on the intake manifold body 1 side.

As shown in FIG. 6, the rotary valve body 8 includes three left and right circular end plate portions 9 arranged at both ends in the direction of the rotation axis X and three left and right end plate portions 9 arranged at equal intervals. Two circular intermediate plate portions 10 are concentric with the rotation axis X.
Metal rotating support shafts 11 are insert-molded and fixed to the left and right end plate portions 9. The rotation support shaft 11 is rotatably supported by a bearing member 12 provided on the head piece 2.

The rotary valve body 8 is provided with a valve body portion 4 corresponding to each intake opening 3 along the direction of the rotation axis X.
The valve body 4 changes the opening area of the intake passage 15 that communicates with the intake opening 3 by driving rotation of the rotary valve body 8 by the electric motor 8a. And between the adjacent intermediate plate portions 10.

As shown in FIGS. 5 and 6, between the outer peripheral surfaces of the end plate portions 9 and the intermediate plate portions 10 and the holding surfaces of the bore piece 7 and the head piece 2 that rotatably hold the outer peripheral surfaces. Is fitted with a resin sealing material 13 that prevents the intake air from entering and exiting the adjacent intake openings 3.
The bore piece 7 and the head piece 2 are connected by a snap fit with the seal material 13 interposed therebetween.

As shown in FIG. 7 and FIG. 8, each valve body portion 4 has two end plate portions 9 or 9 so that the two valve body members 14 forming the intake flow path 15 face each other with the rotation axis X interposed therebetween. The intermediate plate portion 10 is integrally molded with resin.
Each valve body member 14 has a cross-sectional shape having a flat flow path forming surface 14 a that faces the intake flow path 15 and an arc-shaped valve body outer peripheral surface 14 b that follows the outer peripheral shape of the end plate portion 9 or the intermediate plate portion 10. It has.

  Each valve body portion 4 includes two flow passage formation surfaces 14a and left and right end plate portions 9 or the flow passage formation surfaces 14a of the two valve body members 14 parallel to each other and along the rotation axis X. An intake passage 15 having a substantially rectangular cross section surrounded by the intermediate plate portion 10 is formed.

  As shown in FIGS. 3, 4, 7, and 8, each valve body 4 is integrally provided with a rectangular tubular funnel portion 16 that extends the intake passage 15 toward the intake manifold body 1. Has been. For this reason, the air inflow from the intake manifold main body 1 to the intake passage becomes smooth, and the necessary air to the engine can be sufficiently supplied.

Since the funnel portion 16 extends integrally with the valve body portion 4, the gap between the valve body portion 4 and the funnel portion 16 formed when the funnel portion 16 is provided in the bore piece 7 is eliminated, and the intake air Resistance can be reduced.
In addition, the intake inlet side of the funnel part 16 is formed in a trumpet shape whose inner diameter increases toward the inlet side.

  As shown in FIG. 6, the exhaust gas recirculation supply passage 6 supplies exhaust gas from the engine supplied through two exhaust gas supply passages 17 formed in parallel to each other inside the rotary valve body 8 into the intake air of each valve body portion 4. The gas is supplied from the exhaust gas outlet 18 provided on the outlet side of the flow path 15 toward the intake opening 3, mixed with the intake air, and burned by the engine.

  The exhaust gas supply passage 17 corresponds to each of the two valve body members 14 constituting each valve body portion 4 so as not to interfere with the intake flow passage 15, and is adjacent to the valve body in the direction of the rotation axis X. The member 14 is formed inside the valve body member 14 so as to communicate with the member 14 in series along the rotation axis X.

  An exhaust gas inlet 19 of each exhaust gas supply path 17 is formed in one end plate portion 9 so as to open toward one end side in the direction of the rotation axis X, and an exhaust gas outlet 18 communicating with each exhaust gas supply path 17 has Each valve body member 14 is open to the valve body outer peripheral surface 14b.

As shown in FIG. 6, each of the exhaust gas inlets 19 has a rotational axis X formed between one end plate 9 that is an end in the direction of the rotational axis X of the rotary valve body 8 and the bearing member 12. Is opened so as to face the annular exhaust gas introduction space 20.
The exhaust gas from the engine flows into the exhaust gas introduction space 20 by opening an unillustrated EGR valve, and the exhaust gas that has flowed in is introduced into each exhaust gas supply path 17 through the exhaust gas inlet 19.

  As shown in FIGS. 7 and 8, the exhaust gas outlet 18 circulates the exhaust gas supplied from the exhaust gas supply passage 17 on the outer peripheral surface 14 b of the valve body and then joins the downstream side of each intake passage 15. In addition, the intake air outside the intake passage 15 is positioned at the center position in the direction of the rotational axis X of the valve body outer peripheral surface 14b and close to the flow passage formation surface 14a on the downstream side of the intake passage 15. It is formed in the valve body outer peripheral surface 14b so that it may open toward the opening 3. As shown in FIG.

A gap 21 communicating with the intake manifold body 1 is formed between the valve body outer peripheral surface 14b of the valve body member 14 and the head piece 2, and the exhaust gas outlet 18 faces the gap 21 when the valve body portion 4 is in the valve open position. It is out.
The gap 21 is partitioned for each valve body portion 4 by the sealing material 13.
When intake air from the intake manifold body 1 flows into the intake opening 3 from the intake passage 15, the pressure in the gap 21 is reduced and the exhaust gas in the exhaust gas supply passage 17 is efficiently supplied so as to be sucked out from the exhaust gas outlet 18. Can do.

As shown in FIG. 9, the exhaust gas outlet 18 is provided with a resin or resin check valve body 22 that can prevent the exhaust gas from flowing backward from the exhaust gas outlet 18 to the exhaust gas supply path 17.
The exhaust gas outlet 18 opens to a flat concave surface portion 23 formed on the outer peripheral surface 14b of the valve body, and the check valve body 22 is fixed to the concave surface portion on the intake manifold body 1 side by adhesion or the like from the exhaust gas outlet 18. The fixed portion 22a and the valve body portion 22b for opening and closing the exhaust gas outlet 18 are formed in a plate shape integrally provided via a thin portion 22c that can be easily deformed.
The fixed portion 22a may be fixed by means other than adhesion such as screwing.

When the pressure (supercharging pressure) on the intake opening 3 side is higher than the pressure on the exhaust gas supply path 17, the check valve body 22 is held in a posture in which the valve body portion 22 b closes the exhaust gas outlet 18 and the exhaust gas flows backward. To prevent.
When the pressure on the intake opening 3 side is lower than the pressure on the exhaust gas supply path 17 side, the posture of the valve body portion 22b changes to the posture of opening the exhaust gas outlet 18 due to elastic deformation of the thin portion 22c, and the intake air from the exhaust gas outlet 18 The supply of exhaust gas to the opening 3 is allowed.

In the intake stroke of the engine, the check valve body 22 is opened by the suction effect of the intake air passing through the intake opening 3, and the exhaust gas is supplied from the exhaust gas outlet 18 to the intake opening 3.
At this time, since the exhaust gas is in a supply standby state in the exhaust gas supply path 17, the exhaust gas is supplied to the intake opening 3 at the same time as the check valve body 22 is opened.

  Therefore, the check valve body 22 improves the exhaust gas supply responsiveness, and controls the opening and closing operation of the EGR valve to supply an optimal amount of exhaust gas to the intake opening 3 to improve fuel consumption in the entire use range of the engine. And exhaust gas can be cleaned.

2 and 7 show a state in which the valve body portion 4 is in the minute valve open position (TCV state) at the time of idling or low speed rotation of the engine.
In this minute valve open state, the intake flow path 15 and the intake opening 3 communicate with each other through a narrow passage 27 between the one valve body member 14 and the head piece 2, and the intake opening 3 has a high flow velocity. Intake flow is generated.

A strong intake flow can be easily burnt completely by promoting atomization of fuel and generating a tumble flow in the engine, so that it is possible to improve fuel consumption and clean exhaust gas.
When an EGR valve (not shown) is opened in this minute valve open state, the exhaust gas is supplied from the exhaust gas outlet 18 to the intake opening 3 due to a suction effect by a strong intake flow.

FIG. 8 shows a state in which the valve body portion 4 of the rotary valve body 8 is in the valve open position during medium speed rotation or high speed rotation of the engine.
In this valve open state, the intake resistance from the intake manifold body 1 to the intake opening 3 is minimized, and when the EGR valve is opened, exhaust gas is supplied from the exhaust gas outlet 18 to the intake opening 3.

[Second Embodiment]
FIG. 10 shows another embodiment of the present invention.
In this embodiment, one of the two exhaust gas supply passages 17 shown in the first embodiment is supplied with a combustible gas such as a gas filling the engine (blow-by gas) or a combustible gas such as a transpiration gas in a fuel tank. A gas supply path 24 is provided.

  For this reason, the combustible gas inlet 25 of the combustible gas supply path 24 is formed in the other end plate portion 9 so as to open toward the other end side in the rotation axis direction, and is formed in the same manner as the exhaust gas introduction space 20. It opens so that the combustible gas introduction space 26 may be faced.

Therefore, in this embodiment, the exhaust gas of the engine and the combustible gas in the engine or the fuel tank are supplied from the outlet side of the intake passage 15 of each valve body part 4 toward the intake opening 3 to be mixed with the intake air. And can be burned by the engine.
Other configurations are the same as those of the first embodiment.

[Other Embodiments]
1. In the intake device for an internal combustion engine according to the present invention, the gas supplied to the intake air may be a gas such as an engine blow-by gas or an evaporation gas in a fuel tank in addition to the exhaust gas from the engine.
2. In the intake device for an internal combustion engine according to the present invention, any or all of the intake manifold main body, the head piece, and the rotary valve may be formed of an aluminum alloy.

DESCRIPTION OF SYMBOLS 1 Intake manifold main body 2 Headpiece 3 Intake opening 8 Rotating valve body 14b Outer peripheral surface 15 Intake flow path 17 Gas supply path 18 Gas outlet 19 Gas inlet 20 Gas introduction space 21 Gap 22 Valve body X Rotation axis

Claims (4)

An intake manifold body;
A headpiece having a plurality of intake openings arranged in parallel;
A plurality of intake openings each having a tunnel-like intake flow path, and a rotary valve body that changes an opening area of the intake flow path with respect to the intake opening by relative rotation with the headpiece;
While forming a gas supply path along the rotational axis of the rotary valve body at a position that does not interfere with the intake flow path in the rotary valve body,
A gas outlet is formed on the outer peripheral surface of the rotary valve body so that the gas supplied from the gas supply passage flows on the outer peripheral surface of the rotary valve body and then merges with the downstream side of each intake passage. An intake device for an internal combustion engine.   2. The intake air for an internal combustion engine according to claim 1, wherein a gap communicating with the intake manifold body is formed between an outer peripheral surface of the rotary valve body and the head piece, and the gas outlet is formed so as to face the gap. apparatus.   The intake device for an internal combustion engine according to claim 1 or 2, wherein a valve body capable of preventing a reverse flow of gas from the gas outlet to the gas supply path is provided.   The gas inlet of the said gas supply path is made to face the gas introduction space formed cyclically | annularly around the rotating shaft center at the edge part of the rotating shaft center direction of the said rotary valve body. Intake device for internal combustion engine.

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