JP2009216066A - Air intake device of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce valve drive power for opening and closing an on/off-valve while preventing the deterioration of volume efficiency caused by the on/off-valve by improving the structure of the on/off-valve for changing over the passage length of an intake passage. <P>SOLUTION: In an air intake device of an internal combustion engine, the on/off-valve 20 changing over the passage length of the intake passage 11 opens and closes a communication opening 15 making an intake chamber 10 communicate with an intermediate part of the intake passage 11. The communication opening 15 is formed by being surrounded by a peripheral part 16 formed with a chamber wall 12 of the intake chamber 10. The on/off-valve 20 is provided with a valve element 30, and a conversion mechanism 62 converting a valve-closing rotating force rotating the on/off-valve 20 in a valve-closing direction to a pressing force for pressing a rear-end seal part 35 of the valve element 30 against a rear edge 16b of the peripheral part 16. In the conversion mechanism 62, when a seal member 51 of the valve element 30 in the valve-closing direction abuts on the front edge 16a of the peripheral part 16, and the valve element 30 closes the communication opening 15, a seal member 51 abuts on the front edge 16a, and thereby the pressing force is increased. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an intake device for an internal combustion engine including an on-off valve that switches a passage length of an intake passage, and more particularly to a structure of the on-off valve.

In an intake device of an internal combustion engine, the passage length of the intake passage is switched by an opening / closing valve that opens and closes an intake chamber into which intake air is introduced and a communication port that communicates the intake air in the intake chamber to the middle of the intake passage. Things are known. (For example, see Patent Document 1)
JP-A-61-96167

When the opening / closing valve for switching the passage length of the intake passage moves along the inner wall surface of the intake chamber and the peripheral portion forming the communication port, the open / close valve and the peripheral portion are opened and closed when the communication port is opened and closed. In order to improve the sealing performance between the opening and closing valve, a rubber seal member is provided, or in order to increase the contact pressure between the opening and closing valve and the peripheral edge, the opening and closing valve is pressed against the chamber wall and peripheral edge. Therefore, the sliding resistance of the on-off valve in the course of the opening / closing operation increases, and it is necessary to increase the valve driving force.
In addition, when the on-off valve that rotates about the rotation center line is disposed away from the peripheral edge when the communication port is opened, the valve is open in the radial direction about the rotation center line. A dead space, which is a space where intake air hardly flows, is formed between the opening / closing valve and the chamber wall, and the opening / closing valve may be enlarged. For this reason, the volume of the intake chamber is reduced or the intake air in the intake chamber is reduced. This increases resistance and causes volume efficiency to decrease.

  The present invention has been made in view of such circumstances, and the invention according to claims 1 to 6 can be achieved by devising a structure of an on-off valve for switching the passage length of the intake passage. An object of the present invention is to improve the sealing performance of the on-off valve and reduce the valve driving force for opening and closing the on-off valve while avoiding the resulting decrease in volumetric efficiency. The invention described in claim 2 further aims to improve the sealing performance of the on-off valve, and the invention described in claim 3 further improves the sealing performance of the on-off valve in the direction of the rotation center line. The invention described in claim 4 further aims to reduce the size of the on-off valve by configuring the conversion mechanism with a simple structure, and the invention described in claim 5 An object of the present invention is to improve the sealing performance of the on-off valve and to suppress the vibration of the valve body that can move relative to the base member by an elastic spacer arranged between the body and the base member. It is another object of the described invention to improve the assembling property of the elastic spacer and the elastic seal member constituting the tip of the valve body to the on-off valve.

The invention described in claim 1 includes an intake chamber (10) into which intake air is introduced, an intake passage (11) for guiding intake air in the intake chamber (10) to a combustion chamber, the intake chamber (10), and the intake air An intake device for an internal combustion engine provided with a communication port (15) for communicating with the middle of the passage (11), and opening and closing the communication port (15) increases the length of the intake passage (11). In the intake device for an internal combustion engine including the switching valve (20) for switching, the communication port (15) is formed to be surrounded by a peripheral edge portion (16) constituted by a chamber wall (12) of the intake chamber (10). The on-off valve (20) rotates about the rotation center line (L) along the inner wall surface (12a) and the peripheral edge (16) of the chamber wall (12), thereby the communication port ( 15) Valve body (30) that opens and closes, and valve closing rotation that rotates the opening and closing valve (20) in the valve closing direction A conversion mechanism (62) that converts the force into a pressing force (F) that presses the valve body (30) against the peripheral edge portion (16), and the conversion mechanism (62) When the tip (51) of the valve body (30) abuts on the contact portion (16a) of the chamber wall (12) and the valve body (30) closes the communication port (15), the tip An intake device for an internal combustion engine that increases the pressing force (F) when the portion (51) contacts the contact portion (16a).
According to a second aspect of the present invention, in the intake device for an internal combustion engine according to the first aspect, the peripheral portion (16) has a funnel portion (16a) formed in a funnel shape whose diameter increases toward the upstream side of the intake air. The contact portion (16a) is the funnel portion (16a).
According to a third aspect of the present invention, in the intake device for an internal combustion engine according to the first or second aspect, a plurality of the intake passages (11) are arranged in a rotation center line direction parallel to the rotation center line (L). The communication port (15) and the on-off valve (20) are provided in each intake passage (11), and the valve body (30) is provided at a side end portion in the direction of the rotation center line. Valve-side protrusions (36a, 37a) extending in the rotation direction (R) of the on-off valve (20) are provided, and the peripheral edge portion (16) is centered on the rotation center line (L). A wall-side protrusion (17) extending in the rotation direction (R) is provided at a position overlapping the valve-side protrusion (36a, 37a) in the radial direction or the rotation center line direction, and the valve side The ridges (36a, 37a) and the wall-side ridge (17) constitute a labyrinth seal structure.
According to a fourth aspect of the present invention, in the intake device for an internal combustion engine according to any one of the first to third aspects, the on-off valve (20) is configured such that the valve body (30) is rotated by the on-off valve (20). A base member (40) that is rotatably supported in the moving direction (R) is provided, and the conversion mechanism (62) includes a pressing portion (42) provided in the base member (40), and the valve body (30 ) And a pressed portion (32) that can come into contact with the pressing portion (42), and the closing portion is in a state where the tip end portion (51) is in contact with the peripheral edge portion (16). The base member (40) rotates relative to the valve body (30) or the valve body (30) relative to the base member (40) in the valve closing direction by the valve turning power. Thus, the pressing portion (42) comes into contact with the pressed portion (32) to generate the pressing force (F).
According to a fifth aspect of the present invention, in the intake device for an internal combustion engine according to the fourth aspect, the valve closing rotational power is transmitted to the valve body (30) via the base member (40), and the on-off valve ( 20) is a state in which the base member (40) and the valve body (30) are elastically deformed by the valve closing rotational force in a state in which the tip part (51) is in contact with the contact part (16a). Between the base member (40) and the valve element (30) through the elastic spacer (55). Is.
According to a sixth aspect of the present invention, in the intake device for an internal combustion engine according to the fifth aspect, the tip portion (51) is provided by an elastic seal member (51) that is elastically deformed by contact with the contact portion (16a). The elastic seal member (51) and the elastic spacer (55) are configured to be an integrally formed elastic member (50).

According to the first aspect of the present invention, when the on-off valve that switches the passage length of the intake passage is rotated by the closing force to close the communication port, the conversion mechanism that converts the closing force to the pressing force is: The pressing force is generated in a state in which the distal end portion is in contact with the contact portion after the distal end portion of the valve body is in contact with the peripheral portion and the valve body closes the communication port. Then, the valve body is pressed against the contact portion by this pressing force, and the sealing pressure is increased, so that the sealing performance of the on-off valve is improved. In this way, the pressing force that enhances the sealing performance of the valve body acts on the valve body after the tip portion abuts on the contact portion and the valve body closes the communication port, so that the valve body closes the communication port. The valve opening power during the valve closing operation can be reduced.
In addition, since the on-off valve rotates the valve body along the inner wall surface and the peripheral portion of the chamber wall, when the on-off valve opens the communication port, the valve is a type of valve that is radially separated from the chamber wall or the peripheral portion. As compared with the above, the dead space, which is a space in which intake air hardly flows, formed between the open / close valve and the chamber wall, is reduced, and the open / close valve can be downsized. As a result, the volume of the intake chamber can be reduced by the on-off valve and the intake resistance can be reduced, thereby improving the volume efficiency.
According to the second aspect of the present invention, the contact portion with which the tip end portion of the valve body abuts is the peripheral portion that forms the communication port. Will improve. Further, since the peripheral portion has the funnel portion, the flow of the intake air becomes smooth, so that the pressure loss is reduced and the volume efficiency is improved.
According to the third aspect, the labyrinth seal structure constituted by the valve-side protrusion and the wall-side protrusion improves the sealing performance at the side of the on-off valve in the direction of the rotation center line. Further, the labyrinth seal structure can reduce the contact resistance between the valve-side protrusion and the peripheral portion in the turning process of the on-off valve, so that the rotational force can be reduced.
According to the fourth aspect of the present invention, the conversion mechanism can be configured with a simple structure by allowing the base member and the valve body, which are respectively provided with the pressing portion and the pressed portion to be in contact with each other, to be relatively rotatable in the rotation direction. Therefore, the on-off valve provided with the conversion mechanism can be reduced in size.
According to the fifth aspect of the present invention, the elastic spacer is elastically deformed, so that the valve body is relatively moved including the relative rotation in the rotation direction with respect to the base member that transmits the valve closing rotational force to the valve body. Therefore, the positional deviation between the valve body and the contact portion is absorbed by the elastic spacer, and the sealing performance of the on-off valve is improved. In addition, since the valve body reliably contacts the contact portion, the conversion mechanism that generates a pressing force that increases when the tip portion contacts the contact portion operates reliably. Sealability is improved. Furthermore, since the elastic spacer disposed between the valve body and the base member reduces the vibration of the valve body due to intake pulsation and vibration, the noise generated when the valve body hits the base member can be reduced. Can do.
According to the sixth aspect of the present invention, a member that elastically deforms in the on-off valve (that is, an elastic spacer is interposed between the valve body and the base member) (i.e. The elastic seal member and the elastic spacer are disposed at two locations. Therefore, even when the positional deviation between the valve body and the contact portion is large, the positional deviation is absorbed by the elastic seal member and the elastic spacer, and the seal of the on-off valve Improves. Further, since the elastic seal member and the elastic spacer are integrally formed to constitute the elastic member, the assembling property of the elastic seal member and the elastic spacer to the on-off valve is improved.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
Referring to FIG. 1, an internal combustion engine provided with an intake device 1 to which the present invention is applied is a multi-cylinder internal combustion engine mounted on a vehicle, and a plurality of four cylinders as a predetermined number are arranged in series. It is a stroke internal combustion engine.

The internal combustion engine includes an engine body including a cylinder block in which the four cylinders are integrally formed, and a cylinder head coupled to the cylinder block. Pistons fitted in the respective cylinders so as to be capable of reciprocating form combustion chambers between the cylinders and the cylinder heads.
The internal combustion engine includes an intake device 1 that guides intake air (hereinafter referred to as “intake air”) to each combustion chamber, a fuel injection valve that supplies fuel to the intake air to form an air-fuel mixture, and exhaust from each combustion chamber. And an exhaust device that guides the generated combustion gas to the outside of the internal combustion engine as exhaust gas.
The piston is driven by the pressure of combustion gas generated by the combustion of fuel in the combustion chamber, and rotates the crankshaft.

The intake device 1 includes an air cleaner 2 that is an intake intake portion that takes in air from outside the internal combustion engine as intake air, a throttle body 3 that is provided with a throttle valve that controls the flow rate of intake air that has passed through the air cleaner 2, and the throttle valve The intake manifold M that guides the flow-controlled intake air to each combustion chamber, and the passage length of the intake passage 11 (see FIG. 2A) according to the engine speed in order to improve volumetric efficiency by using inertia supercharging. And an intake control device C to be changed.
The intake manifold M is disposed between the upstream end Mi connected to the throttle body 3, the downstream end Mo connected to the cylinder head, and both ends Mi and Mo along the flow of intake air. And a main body Mb.
Here, upstream and downstream are related to the flow of intake air.

2 to 4, the intake manifold M includes an intake chamber 10 having an inlet 10 a provided in the end portion Mi, and an intake passage 11 connected downstream of the intake chamber 10 and opened at the end portion Mo. And are provided. The main body Mb is composed of a chamber wall 12 that forms the intake chamber 10 and four intake pipes 13 that form four intake passages 11 that branch from the intake chamber 10. In the intake manifold M, both end portions Mi and Mo, the chamber wall 12, and all the intake pipes 13 are formed of metal or synthetic resin. At this time, the intake manifold M may be formed by integral molding, or may be formed by combining a plurality of divided bodies.
In the intake manifold M, intake air from the throttle body 3 is introduced into the intake chamber 10 through the inlet 10a, and each intake passage 11 guides intake air in the intake chamber 10 to the combustion chamber.

The predetermined number of four intake pipes 13 (and hence the intake passage 11) are provided side by side in the rotation center line direction.
The rotation center line direction is a direction parallel to a rotation center line L of the on-off valve 20 described later, and the radial direction is a radial direction centered on the rotation center line L. The rotation direction R corresponds to the circumferential direction around the rotation center line L.

The chamber wall 12 and each intake pipe 13 share a partition wall 14 that partitions the intake chamber 10 and each intake passage 11. The partition wall 14 is provided with the same number of communication ports 15 as the intake passages 11 that allow the intake chamber 10 to communicate with the intake passages 11 and that are opened and closed by the opening / closing valves 20 of the intake control device C.
Each intake passage 11 is divided into an upstream passage 11 a upstream from the communication port 15 and a downstream passage 11 b downstream from the communication port 15 at a portion where the communication port 15 opens. According to the open / close state of the communication port 15 by the on-off valve 20, a first passage when the communication port 15 is closed by the on-off valve 20 and a second passage when the communication port 15 is opened by the on-off valve 20 Can be switched. The passage length of the first passage including the upstream passage 11a and the downstream passage 11b is longer than the passage length of the second passage not including the upstream passage 11a.

Each communication port 15 is formed so as to be surrounded by a peripheral edge portion 16 constituted by the partition wall 14 which is the chamber wall 12 or each intake pipe 13. The peripheral edge portion 16 intersects a plane perpendicular to the rotation center line L (hereinafter referred to as “orthogonal plane”) and faces the front edge portion 16a and the rear edge portion 16b facing each other in the rotation direction R, and the orthogonal plane. And a pair of side edge portions 16c and 16d which are substantially parallel to each other and which face each other in the rotation center line direction.
The front edge portion 16a is a contact portion of the chamber wall 12 with which a seal member 51 to be described later contacts, and a funnel that expands in a circular arc shape corresponding to the shape of the seal member 51 and toward the upstream side of the intake air. It is formed into a shape. Specifically, the front edge portion 16a, which is a part of the peripheral edge portion 16 and is also a funnel portion, is a flow of intake air flowing into the intake passage 11 from the intake chamber 10 through the communication port 15 in the peripheral edge portion 16. Is the most bent and flowing part. For this reason, in the front edge portion 16a, the diameter of the communication port 15 increases smoothly from the contact portion where the seal member 51 contacts to the upstream, and further spreads downstream from the contact portion. Even toward the front, the communication port 15 is smoothly curved and widened so that the diameter of the communication port 15 increases.
The rear edge portion 16b is linear in a direction substantially parallel to the rotation center line direction, and the side edge portions 16c and 16d are arc-shaped in the rotation direction R.

Referring to FIG. 1, the intake control device C is disposed in the intake chamber 10 and opens and closes the communication port 15, and an electric motor that is an actuator attached to the intake manifold M and driving the open / close valve 20. 5 and a drive mechanism having a reduction gear mechanism (not shown) for reducing the rotation of the electric motor 5. The turning force that is the valve driving force generated by the reverse-rotating electric motor 5 is transmitted to the on-off valve 20 via the reduction gear mechanism as a transmission mechanism, and drives the on-off valve 20 to open and close.
The electric motor 5 is controlled by a control device to which the engine rotational speed of the internal combustion engine is input, and when the engine rotational speed is equal to or lower than the predetermined rotational speed, the on-off valve 20 closes the communication port 15 and the predetermined rotational speed. The on-off valve 20 is driven so that the on-off valve 20 fully opens the communication port 15 when the value exceeds.

Referring also to FIG. 2, the on-off valve 20 is driven by the electric motor 5 to rotate in the rotation direction R about the rotation center line L, the inner wall surface 12 a and the peripheral edge of the chamber wall 12. A valve body 30 that opens and closes the communication port 15 by rotating along the portion 16, and a base member that rotates together with the valve shaft 21 and is held so as to be relatively movable in the rotation direction R. 40, an elastic spacer which is disposed between the valve body 30 and the base member 40 and is elastically deformable, and valve closing rotation power (see FIG. 10B) by the electric motor 5 is connected to the peripheral portion 16 of the valve body 30. A conversion mechanism 62 that converts the pressure force F (see FIG. 10B) to be pressed against the valve body 30 and an interlocking mechanism 63 that enables relative movement (relative rotation here) between the valve body 30 and the base member 40.
In this embodiment, the valve shaft 21 is one shaft common to all the on-off valves 20, and all the base members 40 constitute an integrated base assembly B. The inner wall surface 12a is a cylindrical surface having the rotation center line L as the center line.
Then, the turning force of the electric motor 5 is transmitted to the base member 40 (or the base assembly B) from the valve shaft 21 to which the turning force is directly transmitted by the drive mechanism, and the valve body is passed through the base member 40. Transmitted to 30.

Here, the rotation direction R is a valve closing direction which is a direction when the valve body 30 closes the communication port 15 and a direction opposite to the valve closing direction when the valve body 30 opens the communication port 15. It consists of a certain valve opening direction. The rotational power generated by the electric motor 5 includes valve closing rotational power for rotating the on-off valve 20 in the valve closing direction and valve opening rotational power for rotating the on-off valve 20 in the valve opening direction.
Further, the expressions “front” and “rear” mean the front side and the rear side in the valve closing direction of a member or a part, respectively.

  The valve shaft 21 penetrating through the intake chamber 10 in the direction of the rotation center line is formed on both side walls of the chamber wall 12 in the direction of the rotation center line (FIG. 1 shows one side wall 16c). It is rotatably supported. One shaft end 21c of the valve shaft 21 is supported on the side wall 12c via the cover 4 and the bearing by being supported by the cover 4 fixed to the side wall 12c and the bearing held by the cover 4. The other shaft end portion 21d is supported by the side wall via the bearing by being supported by the bearing held on the other side wall.

The base assembly B has a plurality of support arms 22 to 24 through which the valve shaft 21 is inserted and arranged at intervals in the direction of the rotation center line, and the support arms 22 to 24 and all the base members 40 Is one member integrally formed of synthetic resin.
The plurality of support arms 22 to 24 are disposed at both ends of the base assembly B in the direction of the rotation center line, and are fixed to the valve shaft 21 so that each base member 40 rotates integrally with the valve shaft 21 1 A pair of support arms 22 and 23 and a support arm 24 arranged at the center of the base assembly B in the direction of the rotation center line and supported by the valve shaft 21 are configured.

2, 5 to 8, each base member 40 is formed with a groove 41a extending in the rotation direction R on the outer peripheral surface side, and the valve body 30 is fitted into the groove 41a. A pair of fitting portions 41 that are holding portions for holding the valve body 30 by the above, a pressing portion 42 having an abutting surface 42a against which the valve body 30 abuts, and an engaging portion comprising a concave portion that engages with the valve body 30 43 is provided.
The pair of fitting portions 41 are disposed at both end portions of each base member 40 in the rotation center line direction, and extend in an arc shape in the rotation direction R. A portion of the fitting portion 41 adjacent to each groove 41a at the rotation center line L constitutes a protrusion 41b that protrudes radially outward with respect to the bottom surface of the groove 41a and extends in an arc shape in the rotation direction R. . As shown in FIG. 3, the protrusion 41b is opposed to the wall-side protrusion 17 at the same position in the rotation center line direction in the radial direction, and the distance between the protrusions 41b, 17 in the radial direction is reduced. Thus, the sealing performance of the labyrinth seal structure constituted by the protrusions 17 is enhanced.

  The pressing portion 42 is located at the rear end portion of the base member 40. The contact surface 42a has a shape that is located radially inward as it goes in the valve closing direction (see also FIG. 10B). Therefore, the contact surface 42a is a surface that intersects the rotation direction R, and a virtual cylindrical surface that has the rotation center line L as the center line intersects the contact surface 42a.

  The engaging portion 43 is an elastic spacer except that the engaging portion 43 is not engaged with the engaging portion 33 of the valve body 30 in order to allow the base member 40 to rotate relative to the valve body 30 in the rotating direction. The engaging portion 33 is engaged with the elastic force of 55, and the valve body 30 and the base member 40 can rotate together in the engaged state.

Referring to FIGS. 2, 5, 6, and 9, the valve body 30 is disposed at a main body member 31 that closes the entire communication port 15 when the on-off valve 20 is closed, and a distal end portion 31 a of the main body member 31. And a seal member 51 that constitutes the distal end portion of the valve body 30.
The main body member 31 has a plurality of protrusions 34 as mounting portions provided on the outer peripheral surface side on the front end portion 31a and attached to the seal member 51 by engagement, and a rear end seal portion 35 (provided on the rear end portion). 6) and a pair of side end seal portions 36 and 37 (see FIG. 6) disposed at both end portions in the direction of the rotation center line, and are fitted in the groove 41a on the inner peripheral surface side. Engageable with engagement portion 43, fitting portion 38 that is a projection as a held portion to be mated, pressed portion 32 having a contact surface 32a that can contact with contact surface 42a of base member 40 The projecting portion 34, the seal portions 35 to 37, the fitting portion 38, the pressed portion 32, and the engaging portion 33 are one member integrally formed of synthetic resin.
The seal portion of the valve body 30 is a portion that seals the communication port 15 with the peripheral edge portion 16, and is constituted by the seal member 51 and the seal portions 35 to 37.

The rear end seal portion 35 extending parallel to the rotation center line direction has a cylindrical seal surface 35a in surface contact with the rear edge portion 16b of the peripheral edge portion 16.
The side end seal portions 36 and 37 are provided with valve-side protrusions 36a and 37a that protrude outward in the radial direction and extend in parallel with the orthogonal plane and in the rotation direction R. As shown in FIG. 3, the pair of side edge portions 16 c and 16 d of the peripheral edge portion 16 project in the radial direction, extend parallel to the orthogonal plane, and extend in the rotation direction R. A wall-side ridge 17 is provided.
The ridges 36a and the ridges 17, and the ridges 37a and the ridges 17 protrude in the radial direction to a position where they overlap each other in the radial direction. Further, minute gaps in the radial direction are formed between the protrusions 36a and 37a and the side edge portions 16c and 16d. And the labyrinth seal structure is comprised by the protrusion 36a and the protrusion 17, and the protrusion 37a and the protrusion 17, respectively.
In this embodiment, both side edge portions 16c and 16d of peripheral edge portions 16 adjacent to each other in the rotation center line direction partially have a common portion, and one protrusion 17 is provided in the common portion. Separate ridges 17 may be provided on the side edge portions 16a and 16d.

The pressed portion 32 and the engaging portion 33 are configured by a plurality of protruding portions 39 protruding inward in the radial direction and arranged at intervals in the rotation center line direction. For this reason, the main body member 31 including the pressed portion 32 and the engaging portion 33 is reduced in weight. In addition, each rib-shaped protruding portion 39 is in a position that partially overlaps with the rear end seal portion 35 in the rotation direction R, and when the on-off valve 20 closes the communication port 15, a pressing portion is provided on the rear edge portion 16 b. The rigidity of the rear end seal portion 35 pressed by 42 is increased.
The contact surface 32a of each pressed part 32 has a shape that is located radially inward as it goes in the valve closing direction (see also FIG. 10B). Therefore, the contact surfaces 42a and 32a are surfaces that intersect with the rotation direction R, and are virtual cylinder surfaces that have the rotation center line L as the center line intersect on the contact surfaces 42a and 32a.
The pressing unit 42 and the pressed part 32 constitute a conversion mechanism 62.

The engaging portion 33 formed of a convex portion that engages with the engaging portion 43 is constituted by the tip portion of each protruding portion 39. The lip 56 of the elastic spacer 55 urges the valve body 30 and the base member 40 so that the engaging portion 43 is engaged with the engaging portion 33 by its elastic force. Then, the interlocking mechanism 63 is configured by both the engaging portions 43 and 33. Thus, the structure of the valve body 30 is simplified by forming the pressed portion 32 and the engaging portion 33 on the one protruding portion 39.
By this interlocking mechanism 63, when the on-off valve 20 is closed, the valve body 30 and the base member 40 are such that the seal member 51 abuts against the front edge portion 16a, and the seal member 51 contacts the front edge portion 16a. After the elastic deformation by contact, the elastic spacer 55 rotates integrally until the elastic spacer 55 starts elastic deformation by the valve closing rotational force. And since the engagement state of both the engagement parts 43 and 33 is stably maintained by the elastic force of the elastic spacer 55, the contact between the engagement parts 43 and 33 caused by the intake pulsation and the vibration of the intake manifold M is caused. Abnormal noise generated is reduced.

Referring also to FIG. 10, the arc-shaped sealing member 51 is integrally formed with the elastic spacer 55 and constitutes an elastic member 50 provided in the on-off valve 20 together with the elastic spacer 55. The elastic member 50 is formed of an elastic material having rubber-like elasticity, such as rubber.
The seal member 51, which is an elastic seal member that is elastically deformable by contacting the arcuate front edge portion 16 a of the peripheral edge portion 16, is brought into contact with the front edge portion 16 a in the valve closing direction by valve closing rotational power. It has an arcuate lip 52 that is elastically deformed, and a mounting portion 53 that forms a hole 53a into which the projection 34 of the main body member 31 is fitted. The first lip 52 connected to the attachment portion 53 starts contact with the front edge portion 16a (indicated by a two-dot chain line in FIG. 10), and is in contact with the front edge portion 16a in the main body member 31. The first flexible portion that is elastically deformed and bent in the rotation direction R is configured by the valve closing rotational force acting on the seal member 51 through the first flexible portion.

  The elastic spacer 55 disposed between the tip portion and the protruding portion of the base member 40 includes an attachment portion 53 shared with the seal member 51, and a lip that continues to the attachment portion 53 and contacts the tip portion 40a of the base member 40. 56 and a protrusion 57 which is an insertion portion to be inserted into the insertion hole 40c provided in the tip end portion 40a. The valve body 30 and the base member 40 are assembled via an elastic spacer 55. Due to the elastic deformation of the elastic spacer 55, the valve body 30 and the base member 40 are also relative to directions other than the rotation direction R including the rotation center line direction, including the relative rotation in the rotation direction R. It is movable. For this reason, when the sealing member 51 comes into contact with the front edge portion 16a and the on-off valve 20 closes the communication port 15 due to the elastic deformation of the elastic spacer 55, there is a displacement between the valve body 30 and the communication port 15. If present, not only the deformation of the seal member 51 but also the relative displacement of the valve body 30 relative to the base member 40 due to the elastic deformation of the elastic spacer 55, the valve body 30 and the communication port 15 The misalignment is absorbed, the gap between the valve body 30 and the peripheral edge portion 16 is reliably eliminated, and the sealing performance of the valve body 30 is improved.

The second lip 56 located on the opposite side of the lip 52 across the mounting portion 53 in the rotation direction R is further subjected to the valve closing rotational force after the lip 52 contacting the front edge portion 16a is bent. , The base member 40 is rotated relative to the valve body 30 in the valve closing direction by bending in the rotation direction R in a state of being in contact with the distal end portion 40a (see FIG. 10A). At this time, since the base member 40 is guided to rotate substantially along the rotation direction R with respect to the valve body 30 by the groove 41a and the fitting portion 38 fitted to the groove 41a, the groove The fitting part 41 forming the 41a and the fitting part 38 constitute a guide part for rotating the valve body 30 and the base member 40 that rotate relative to each other substantially along the rotation direction R.
By this relative rotation, the pressing portion 42 is rotated relative to the pressed portion 32 in the valve closing direction, thereby pressing the valve body 30 so that the sealing pressure mainly at the rear end seal portion 35 is increased. A pressing force F is generated. At this time, the valve body 30 hardly rotates or is rotated by a rotation amount smaller than the rotation amount of the base member 40, and the pressing force F is applied to the pressed portion 32 while the pressing portion 42 is slightly bent inward in the radial direction. Add to. Therefore, the lip 56 is elastically deformed and bent in the rotation direction R by the valve closing rotational force acting on the base member 40 between the front end portion 31a and the front end portion 40a of the main body member 31 in the rotation direction. Forming a second flexible portion.

  The seal member 51 is attached to the valve body 30 by the attachment portion 53 having the hole 53a into which the protrusion 34 is inserted, and is attached to the base member 40 by the tip portion 40a provided with the hole 40c into which the protrusion 57 is inserted, and elastic. The spacer 55 can be slightly moved in the rotation direction R and the rotation center line direction.

The operation of the on-off valve 20 will be described with reference to FIGS.
When the engine rotational speed is equal to or lower than the predetermined rotational speed, the on-off valve 20 driven by the electric motor 5 (see FIG. 1) opens the communication port 15 as shown in FIGS. 2 (a) and 2 (b). The communication port 15 is fully closed by being closed. At this time, the intake air introduced into the intake chamber 10 flows through the first passage including the upstream passage 11a of the intake passage 11 and flows out from the outlet 13 toward the combustion chamber.
When the engine rotational speed exceeds the predetermined rotational speed, the opening / closing valve 20 that has closed the communication port 15 is rotated in the valve opening direction by the valve opening rotational power of the electric motor 5 and is shown in FIG. As shown, the communication port 15 is fully opened. At this time, the intake air in the intake chamber 10 flows through the downstream port 11b through the communication port 15, and flows out from the outlet 13 toward the combustion chamber.

  Thereafter, when the engine rotational speed decreases below the predetermined rotational speed, the base member 40 in which the on-off valve 20 in the fully opened position rotates together with the valve shaft 21 by the closing power of the electric motor 5 is closed. To the contact start position (indicated by a two-dot chain line in FIGS. 10 (a) and 10 (b)) where the seal member 51 contacts the front edge portion 16a. Occluded by body 30. Then, from the corresponding contact start position, the valve body 30 moves in the valve closing direction integrally with the base member 40 by the valve closing rotational force of the electric motor 5, and the on-off valve 20 is in contact with the front edge portion 16a. The seal member 51 occupies a second contact position where the lip 52 is bent in the valve opening direction due to elastic deformation. In this second contact position, the sealing pressure is increased by the elastic deformation of the sealing member 51 to improve the sealing performance, and further, there is a positional deviation between the valve body 30 and the communication port 15 for each communication port 15. In addition, the displacement is absorbed by the elastic deformation of the seal member 51, and all the communication ports 15 are reliably closed by the valve body 30. On the other hand, at the second abutting position, the lip 56 of the elastic spacer 55 undergoes elastic deformation that causes the rotation of the conversion mechanism 62 to generate the pressing force F between the valve body 30 and the base member 40. Not.

  Further, when the valve body 30 and the base member 40 are further rotated in the valve closing direction integrally by the valve closing rotational force with the lip 52 in contact with the front edge portion 16a, the lip 56 of the elastic spacer 55 is closed. Then, the base member 40 rotates relative to the valve body 30 in the valve closing direction, and the opening / closing valve 20 converts the valve closing rotational force Fr into the pressing force F by the conversion mechanism 62, thereby The pressure F occupies a third contact position that presses the main body member 31 against the rear edge and each side edge of the peripheral edge 16. In this third contact position, the pressing force F increases as the amount of relative movement of the base member 40 with respect to the valve body 30 increases. For this reason, the sealing pressure at the rear end seal portion 35 is increased, and the radial clearance between the protrusions 36a, 37a and the side edge portions 16c, 16d is reduced in each side end seal portion 36, 37, or The protrusions 36a and 37a abut against the side edge portions 16c and 16d, and the sealing performance of the valve body 30 is improved.

  Then, the process of the valve closing operation until the on-off valve 20 rotates in the valve closing direction from the fully opened state of the communication port 15 and the lip 52 contacts the front edge 16a (or occupies the contact start position). When the seal portions 35, 36, and 37 are in contact with the inner wall surface 12a or the peripheral edge portion 16 of the chamber wall 12, the seal portions 35, 36, and 37 are formed of synthetic resin. Since the sliding resistance is reduced as compared with the case where the portions 35, 36, and 37 are made of rubber, the valve closing power can be reduced, and the valve opening power can be further reduced.

Next, operations and effects of the embodiment configured as described above will be described.
In the intake device 1 of the internal combustion engine, a communication port 15 that is opened and closed by an on-off valve 20 that switches the passage length of the intake passage 11 is formed by being surrounded by a peripheral edge portion 16 constituted by a chamber wall 12 of the intake chamber 10. The valve 20 has a valve body 30 that opens and closes the communication port 15 by rotating along the inner wall surface 12a and the peripheral edge 16 of the chamber wall 12 around the rotation center line L, and the valve closing direction of the valve 20 And a conversion mechanism 62 that converts the closing force for rotating the valve body 30 into a pressing force F that presses the valve body 30 against the peripheral edge portion 16. The conversion mechanism 62 is the tip of the valve body 30 in the valve closing direction. When the seal member 51 abuts on the front edge portion 16a of the peripheral edge portion 16 and the valve body 30 closes the communication port 15, the seal member 51 abuts on the front edge portion 16a, thereby increasing the pressing force F.
With this structure, when the on-off valve 20 that switches the passage length of the intake passage 11 is rotated by the closing force of the electric motor 5 to close the communication port 15, the conversion mechanism that converts the closing force to the pressing force F. 62, the seal member 51 of the valve body 30 abuts on the front edge portion 16a and the valve body 30 closes the communication port 15, and the seal member 51 abuts on the front edge portion 16a. Is generated. Then, the sealing member 51 is pressed against the front edge portion 16a by the pressing force F and the sealing pressure is increased, so that the sealing performance of the valve body 30 is improved. In this way, the pressing force F that enhances the sealing performance of the valve body 30 acts on the valve body 30 after the seal member 51 abuts against the front edge portion 16a and the valve body 30 closes the communication port 15. The valve opening power in the process of the valve closing operation until 30 closes the communication port 15 can be reduced.
Further, since the opening / closing valve 20 rotates along the inner wall surface 12a and the peripheral edge portion 16 of the chamber wall 12 when the opening / closing valve opens the communication port 15, the opening / closing valve 20 is opened from the chamber wall 12 or the peripheral edge portion 16 in the radial direction. Compared to the case where the valves are separated from each other, the dead space formed between the open / close valve 20 in the open state and the inner wall surface 12a of the chamber wall 12 is less likely to flow. The valve 20 can be downsized. As a result, the volume of the intake chamber 10 can be reduced by the on-off valve 20 and the intake resistance can be reduced, so that the volume efficiency is improved.

  The peripheral edge portion (16) has a front edge portion 16a formed in a funnel shape whose diameter increases toward the upstream side of intake air, and the front edge portion is a part of the peripheral edge portion 16 in which the seal member 51 forms the communication port 15 Since the seal member 51 comes into contact with the peripheral edge portion 16 by coming into contact with 16a, the sealing performance of the on-off valve 20 is improved. Further, since the front edge portion 16a has a funnel shape, the flow of the intake air passing through the communication port 15 becomes smooth, so that the pressure loss is reduced and the volume efficiency is improved.

  A plurality of intake passages 11 are provided side by side in the direction of the rotation center line parallel to the rotation center line L, the communication port 15 and the on-off valve 20 are provided in each intake passage 11, Valve side protrusions 36a, 37a extending in the rotation direction R of the on-off valve 20 are provided on the side seal portions 36, 37 provided at the side end portions in the center line direction, and each side edge of the peripheral edge portion 16 is provided. The portions 16c and 16d are provided with wall-side ridges 17 extending in the rotation direction R at positions that overlap the ridges 36a and 37a in the radial direction, and the ridges 36a and 17 and the ridges 37a and Each of the protrusions 17 constitutes a labyrinth seal structure. For this reason, this labyrinth seal structure improves the sealing performance at the side of the on-off valve 20 in the direction of the rotation center line. Further, the labyrinth seal structure can reduce the contact resistance between the protrusions 36a and 37a and the side edge portions 16c and 16d of the peripheral edge portion 16 in the turning process of the on-off valve 20, thereby reducing the rotational force. be able to.

  The on-off valve 20 includes a base member 40 that holds the valve body 30 so as to be relatively rotatable in the rotation direction R, and the conversion mechanism 62 is provided on the pressing portion 42 provided on the base member 40 and the valve body 30. The base member 40 is configured with respect to the valve body 30 by the valve closing rotational power in a state in which the seal member 51 is in contact with the peripheral edge portion 16 and is configured by the pressed portion 42 that can be in contact with the pressing portion 42. When the valve body 30 rotates relative to the base member 40 in the valve closing direction, the pressing portion 42 abuts against the pressed portion 32 and a pressing force F is generated. Since the base member 40 and the valve body 30 provided with the pressed parts 32 can be relatively rotated in the rotation direction R, the conversion mechanism 62 can be configured with a simple structure. The on-off valve 20 can be reduced in size.

  The valve closing power is transmitted to the valve body 30 through the base member 40, and the on-off valve 20 is closed with the seal member 51, which is the tip of the valve body 30, in contact with the peripheral edge portion 16. The elastic spacer 55 enables relative movement including relative rotation in the rotation direction between the base member 40 and the valve body 30 by being elastically deformed by the base member 40 and the valve body 30. It is assembled via a spacer 55. With this structure, the elastic spacer 55 is elastically deformed, so that the valve body 30 moves relative to the base member 40 that transmits the valve closing rotational power to the valve body 30 including the relative rotation in the rotation direction R. Therefore, the positional deviation between the valve body 30 and the peripheral edge portion 16 is absorbed by the elastic spacer 55, and the sealing performance of the on-off valve 20 is improved. In addition, since the valve body 30 surely contacts the peripheral portion 16, the conversion mechanism 62 that generates the pressing force F that increases when the seal member 51 contacts the peripheral portion 16 operates reliably. The sealing performance of the on-off valve 20 by F is improved. In addition, in all the on-off valves 20 provided in the intake manifold M, the valve body 30 reliably contacts the peripheral edge portion 16, so that the sealing performance is improved by the pressing force F generated by the conversion mechanism 62. Is obtained. Further, the elastic spacer 55 disposed between the valve body 30 and the base member 40 reduces the vibration of the valve body 30 due to intake pulsation and vibration, and therefore occurs when the valve body 30 hits the base member 40. Abnormal noise can be reduced.

  The distal end portion of the valve body 30 is configured by a seal member 51 that is elastically deformed by contact with the peripheral edge portion 16, and the valve body 30 is formed by the elastic member 50 in which the seal member 51 and the elastic spacer 55 are integrally formed. Members that elastically deform in the on-off valve 20 (that is, the seal member 51 and the elastic spacer 55) because the tip of the seal member 51 is the seal member 51 and the elastic spacer 55 is interposed between the valve body 30 and the base member 40. Are disposed at two locations, so that even when the positional deviation between the valve body 30 and the peripheral edge portion 16 is large, the positional deviation is absorbed by the elastic seal member 51 and the elastic spacer 55, and the sealing performance of the on-off valve 20 is improved. To do. Further, since the elastic seal member 51 and the elastic spacer 55 are integrally formed to constitute the elastic member 50, the assembling property of the seal member 51 and the elastic spacer 55 to the on-off valve 20 is improved.

Hereinafter, a mode in which a part of the above-described embodiment is changed will be described focusing on the changed portion.
In the chamber wall, the abutting portion with which the tip of the valve body of the on-off valve abuts may be a portion other than the peripheral edge forming the communication port.
In the peripheral part forming the communication port, the part other than the front edge part may be formed in a funnel shape, or the entire peripheral part may be formed in a funnel shape.
The base members 40 of all the on-off valves 20 are integrally formed as the base assembly B in the above embodiment, but may be configured by separate members for each on-off valve.
The seal member 51 and the elastic spacer 55 may be configured by separate members.
Each protrusion of the labyrinth seal structure protrudes in the rotation center line direction, and a minute gap in the rotation center line direction may be formed.
In an on-off valve including a valve body and a base member that can move relative to each other, the rotational force of the actuator transmitted to the valve body may be transmitted to the base member via the valve body. In this case, in the pressing part and the pressed part constituting the conversion mechanism, both the contact surface of the pressing part provided on the base member and the contact surface of the pressed part provided on the valve body are directed toward the valve closing direction. It is formed so as to be located radially outward, and the valve body rotates relative to the base member in the valve closing direction, whereby the pressing portion comes into contact with the pressed portion and a pressing force is generated.
The actuator that drives the on-off valve may be an electric type other than the electric motor, or a pressure type.
Although the internal combustion engine is used for a vehicle in the embodiment, it may be used for a ship propulsion device such as an outboard motor having a crankshaft oriented in the vertical direction.

1 is a schematic exploded perspective view of an intake device to which the present invention is applied. (A) is sectional drawing in the plane orthogonal to the rotation centerline of an on-off valve in the state which the on-off valve of the intake device of FIG. 1 obstruct | occluded the communicating port, Comprising: II-II line of FIG. (B) is an enlarged view of a portion b of (a), and (c) is a diagram corresponding to (b) in a state where the on-off valve opens the communication port. is there. It is principal part sectional drawing in the III-III line of Fig.2 (a). It is a perspective view which shows the principal part of the intake manifold of the intake device of FIG. It is a disassembled perspective view of the principal part of the on-off valve of the intake device of FIG. It is a disassembled perspective view which shows the base member and some valve body of the on-off valve of the intake device of FIG. It is a perspective view of the base member of FIG. It is a figure of the base member of the on-off valve in the VIII arrow view of Fig.2 (a). (A) is a figure of the elastic member of the on-off valve in the direction of arrow IXa in FIG. 5, and (b) is a diagram of the main body member of the valve body of the on-off valve in the direction of arrow IXb in FIG. It is a principal part enlarged view of Drawing 2 (b), (a) is a figure near the tip part of an on-off valve, and (b) is a figure near the rear end part of an on-off valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Intake device, 10 ... Intake chamber, 11 ... Intake passage, 12 ... Chamber wall, 15 ... Communication port, 16 ... Peripheral part, 17 ... Projection, 20 ... On-off valve, 30 ... Valve body, 32 ... Pressed part 35-37 ... seal part, 36a, 37a ... ridge, 40 ... base member, 42 ... pressing part, 50 ... elastic member, 51 ... seal member, 55 ... elastic spacer, 62 ... conversion mechanism,
M: intake manifold, L: rotation center line, R: rotation direction, F: pressing force.

Claims (6)

An intake device for an internal combustion engine, provided with an intake chamber into which intake air is introduced, an intake passage that guides intake air in the intake chamber to a combustion chamber, and a communication port that connects the intake chamber and the middle of the intake passage. There,
In an intake device for an internal combustion engine comprising an on-off valve that switches a passage length of the intake passage by opening and closing the communication port,
The communication port is formed by being surrounded by a peripheral portion constituted by a chamber wall of the intake chamber,
The open / close valve rotates about the rotation center line along the inner wall surface and the peripheral edge of the chamber wall, and rotates the open / close valve in the valve closing direction. A conversion mechanism that converts the valve closing rotational force to be converted into a pressing force that presses the valve body against the peripheral portion,
The conversion mechanism is configured such that when the distal end portion of the valve body in the valve closing direction contacts the contact portion of the chamber wall and the valve body closes the communication port, the distal end portion is the contact portion. An intake device for an internal combustion engine, wherein the pressing force is increased by abutting on the internal combustion engine. The peripheral portion has a funnel portion formed in a funnel shape whose diameter increases toward the upstream side of intake air,
The intake device for an internal combustion engine according to claim 1, wherein the contact portion is the funnel portion. A plurality of the intake passages are provided side by side in a rotation center line direction parallel to the rotation center line,
The communication port and the on-off valve are provided in each intake passage,
The valve body is provided with a valve-side protrusion that extends in a rotation direction of the on-off valve at a side end portion in the rotation center line direction.
The peripheral edge portion is provided with a wall-side ridge extending in the rotation direction at a position overlapping with the valve-side ridge in the radial direction around the rotation center line or in the rotation center line direction,
The intake device for an internal combustion engine according to claim 1 or 2, wherein the valve-side protrusion and the wall-side protrusion form a labyrinth seal structure. The on-off valve includes a base member that holds the valve body so as to be relatively rotatable in a rotation direction of the on-off valve,
The conversion mechanism includes a pressing portion provided on the base member and a pressed portion provided on the valve body and capable of contacting the pressing portion.
In the state where the tip portion is in contact with the contact portion, the valve closing rotational force causes the valve member to close the base member with respect to the valve body or the valve body with respect to the base member. 4. The intake device for an internal combustion engine according to claim 1, wherein the pressing portion is brought into contact with the pressed portion and the pressing force is generated by relative rotation to the pressing portion. 5. The valve closing power is transmitted to the valve body through the base member,
The on-off valve includes the relative rotation between the base member and the valve body by being elastically deformed by the valve closing rotational force in a state where the tip portion is in contact with the contact portion. Equipped with an elastic spacer that allows movement,
The intake device for an internal combustion engine according to claim 4, wherein the base member and the valve body are assembled via the elastic spacer. The tip portion is constituted by an elastic seal member that is elastically deformed by contact with the contact portion,
6. The intake device for an internal combustion engine according to claim 5, wherein the elastic seal member and the elastic spacer are integrally formed elastic members.

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