JP2007255243A - Intake device installing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reduction in engine performance, by preventing going in and out of intake air between a through-hole for a collar and a collar member, without increasing air resistance in an intake passage. <P>SOLUTION: An intake casing 3 of a resin molding forming an intake passage 7 is arranged inside an intake device 1. An intake device side opening 53 is formed in a part corresponding to a head side opening 51 in the intake casing 3, and the through-hole 13a for the collar penetrating up to an opposite side wall surface by passing through the intake passage 7, is formed in a part corresponding to a screw hole 5a of a cylinder head 5. A metallic collar member 55 is inserted into the through-hole 13a for the collar. The intake device 1 is installed on the cylinder head 5 by being fastened to the screw hole 5a by inserting a second bolt 99 into the collar member 55. A recessed part 57 for a seal member recessed more than the periphery, is formed on the side peripheral edge of the cylinder head 5 of the through-hole 13 for the collar, and a head side annular seal member 59 is fitted in the recessed part 57 for the seal member, and is allowed to abut on the peripheral edge of a head side opening 51. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an intake device mounting structure for mounting an intake device having an intake passage to a cylinder head of an engine.

  Conventionally, an intake device such as an intake manifold is attached to a cylinder head of an engine on the periphery of a head side opening connected to an intake port. The intake manifold takes in air from which foreign matter has been removed through an air cleaner.

Although the structure is not such that the intake device is directly attached to the cylinder head, for example, in Patent Document 1, a columnar boss for bolt attachment through which a bolt that fastens the intake duct main body to the intake inlet flange portion of the intake manifold passes is provided. The thing which crosses the flow path in this intake duct main body along the axial direction substantially orthogonal to the intake flow of an internal flow path is disclosed. In this structure, the cross-sectional shape in the direction perpendicular to the axis of the columnar boss for bolt attachment is formed in a streamline shape that is long in the intake flow direction of the flow path in the intake duct body.
Japanese Patent Laid-Open No. 9-273454

  However, as in the conventional intake device mounting structure described above, when a boss is inserted into the intake passage and a bolt is inserted into the boss to mount the intake device, the air resistance is reduced even if the cross-sectional shape of the boss is changed to a streamline shape. There is a problem that an increase in the degree of is inevitable.

  On the other hand, intake members such as intake manifolds and variable intake systems have hitherto been mainly made of aluminum members, but there is a need for resin molded products for weight reduction and the like.

  For example, when a conventional cylinder head is used and only the intake device is changed to a resin molded product, it is necessary to design the intake device without changing the position of the screw hole of the cylinder head. Moreover, in the resin molded product, since the strength of the bolt fastening portion cannot be secured sufficiently, it is necessary to attach a metal collar member and attach the intake device to the cylinder head. At this time, completely covering the periphery of the collar member with the resin boss is not appropriate from the viewpoint of air resistance as described above, and usually the collar member is exposed to the intake passage.

  In such a case, air that does not pass through the air cleaner is sucked from the gap between the collar through-hole of the intake casing and the collar member, foreign matter flows into the intake port, the amount of intake air is not stable, and the engine rotation Disturbance may occur.

  In addition, when using turbo, if there is a gap between the collar through hole and the collar member, the intake air may leak outside.

  Even when the turbo is not used, the intake manifold endurance test is obliged in the case where vaporized fuel flows back into the surge tank of the intake manifold and explodes. This means that if there is a gap in the collar portion, the fuel gas vaporized outside leaks. The risk of explosion increases if vaporized fuel gas leaks into the engine compartment.

  In this way, if the intake air leaks to the outside or outside air enters the intake passage, even if the ratio between the intake air amount and the fuel injection amount is controlled, the intake air balance will be lost on the way, and as a result There is a problem in that the engine performance is deteriorated because the combustion efficiency is lowered.

  The present invention has been made in view of the above points, and the object of the present invention is to prevent intake air from entering and leaving between the collar through hole and the collar member without increasing the air resistance in the intake passage. It is to prevent the engine performance from being lowered.

  In order to achieve the above object, according to the present invention, a seal member is provided at the periphery of the collar through hole so as to contact the periphery of the head opening of the cylinder head.

Specifically, in the first invention, in the attachment structure of the intake device for attaching the intake device having the intake passage to the cylinder head of the engine,
In the cylinder head, a screw hole for attaching the intake device is formed on the periphery of the head side opening connected to the intake port,
The intake device includes a resin molded product intake casing in which the intake passage is formed.
An intake device side opening communicating with the intake passage is formed in a portion corresponding to the head side opening in the intake casing, and a portion corresponding to the screw hole is passed through the intake passage to the opposite wall surface. A through-hole for the collar to penetrate is formed,
A metal collar member is inserted through the collar through hole,
By inserting a fastening member into the collar member and fastening to the screw hole, the intake device is configured to be attached to the cylinder head,
The cylinder head side periphery of the through hole for the collar is formed with a recess for a seal member that is recessed from the periphery,
A head-side annular seal member is fitted in the recess for the seal member, and the head-side annular seal member is in contact with the periphery of the head-side opening.

In the second invention, the concave portion for the seal member gradually increases in inner diameter toward the cylinder head side,
The head-side annular seal member has an outer diameter that gradually increases from the distal end in the insertion direction toward the cylinder head so as to correspond to the recess for the seal member.

  In the third invention, annular protrusions are formed on the outer surface and the inner surface of the head side annular seal member on the distal side in the insertion direction.

  In the fourth invention, an annular recess is formed on the outer periphery of the end opposite to the cylinder head of the collar member, and an anti-head-side annular seal member that contacts the inner surface of the collar through hole is fitted in the annular recess. Yes.

  According to the first aspect of the invention, the head-side annular seal member is fitted into the recess for the seal member on the cylinder head side periphery of the collar through hole, and the head-side annular seal member is brought into contact with the head-side opening periphery. For this reason, air that does not pass through the air cleaner does not enter the intake passage from the through-hole for the collar, so that foreign matter can be prevented and intake air is not leaked to the outside. Can be made. By preventing the intake and exit of the intake air in this way, it is possible to prevent the engine rotation from being disturbed and prevent the engine performance from deteriorating. In addition, since the vaporized fuel gas injected from the fuel injection nozzle can be prevented from leaking into the engine room, the risk of explosion can be reduced and the safety can be increased. Moreover, since the outer periphery of the collar member exposed in the intake passage is not covered with resin, an increase in air resistance can be prevented. Furthermore, by molding the intake casing with resin, the mass can be reduced and the manufacturing cost can be reduced as compared with a metal such as aluminum.

  According to the second aspect of the invention, since the head-side annular seal member reliably contacts the cylinder head-side peripheral edge of the collar through-hole and the outer periphery of the collar member, the head-side annular seal member is not made larger than necessary. Thus, it is possible to reliably prevent the intake and exit of the intake air and prevent the engine from being disturbed.

  According to the third aspect of the invention, the annular protrusion provided on the outer surface on the distal end side in the insertion direction of the head-side annular seal member contacts the recess for the seal member, and the annular protrusion provided on the inner surface is the outer periphery of the collar member. Therefore, it is possible to reliably close the gap between the collar through hole and the collar member to prevent the intake and exit of the intake air from the collar through hole, and to more reliably prevent the engine rotation from being disturbed.

  According to the fourth aspect of the invention, the anti-head-side annular seal member is fitted on the outer periphery of the end of the collar member opposite to the cylinder head, and the anti-head-side annular seal member is brought into contact with the inner surface of the collar through hole. For this reason, it is possible to prevent the engine from being disturbed by preventing the intake air from entering and exiting from the collar through hole opposite to the cylinder head. Further, since the anti-head side annular seal member is fitted on the outer periphery of the collar member, the structure is simplified, and the surface of the annular seal member is not damaged by the inner surface of the collar through-hole when the collar is press-fitted. Since the member can be easily attached, it is possible to prevent the vaporized fuel gas from leaking, and to eliminate the danger of explosion, thereby further improving the safety.

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

(Embodiment 1)
FIG. 9 shows an intake device mounting structure 10 according to Embodiment 1 of the present invention. As shown in FIGS. 1 to 3, the intake device 1 is a kind of variable intake device and is a vertical vortex generator. The intake device 1 includes a resin intake casing 3 (shown in FIGS. 4 and 5) in which an intake passage 7 connected to an intake port (not shown) is formed. As shown in FIGS. 7 and 9, the intake casing 3 is placed on a cylinder head 5 of an engine in which two cylinders (not shown) are arranged side by side in a direction in which a crankshaft (not shown) extends. Connected in a connected state. In the cylinder head 5, a screw hole 5 a for attaching an intake device for attaching the intake device 1 is formed in the periphery of the head side opening 51 connected to the intake port.

  An intake passage 7 is formed in the intake casing 3 for each cylinder of the engine, and upper flanges 9 are integrally formed on the outer periphery of the upstream end of the intake passage 7. A lower flange 11 having an annular seal groove 11a on the lower surface is integrally formed at the lower end of the intake casing 3. A fuel injection nozzle (not shown) for supplying fuel to each cylinder of the engine is attached to the side surface of the intake casing 3 in the fuel injection nozzle opening 12.

  An intake device side opening 53 is formed in a portion corresponding to the head side opening 51 in the intake casing 3. Two boss portions 13 are integrally formed on the outer periphery of the intake casing 3 corresponding to the intake device mounting screw hole 5a so as to correspond to the intake passages 7 respectively. The boss portion 13 is formed with a collar through hole 13 a that passes through the intake passage 7 to the opposite wall surface. A metal collar member 55 is inserted through the collar through-hole 13a.

  The intake device 1 is attached to the cylinder head 5 by inserting a second bolt 99 as a fastening member into the collar member 55 and fastening it to the screw hole 5a for attaching the intake device.

  An intake manifold 15 connected to a surge tank (not shown) is disposed upstream of the intake casing 3. A flange 17 is integrally formed at the lower end of the intake manifold 15 so as to correspond to the upper flange 9 of the intake casing 3. On the other hand, the upper flange 9 is formed with an intake manifold mounting hole 9a (see FIG. 2) for mounting the intake manifold 15. An attachment hole 17a is formed in the flange 17 so as to correspond to the intake manifold attachment hole 9a. An insert nut (not shown) is press-fitted into the intake manifold mounting hole 9a.

  As shown in FIGS. 4 and 5, the intake casing 3 is formed with a circular valve insertion hole 19 extending in the cylinder row direction and crossing the intake passages 7 when viewed from the cylinder row direction. Yes. A resin-made rotary valve 21 is rotatably inserted into the valve insertion hole 19 so as to variably adjust the flow of intake air in accordance with the operating state of the engine.

  As shown in FIG. 6, the rotary valve 21 includes two columnar valve bodies 29 arranged in the valve insertion holes 19 so as to correspond to the intake passages 7. A connecting portion 31 having a diameter smaller than that of the valve main body 29 is integrally connected, and a drive shaft 33 is integrally protruded from one end surface (right side in FIG. 6) of each valve main body 29 in the cylinder row direction. A driven shaft 35 is integrally projected on the left side of FIG.

  A through passage 37 is formed in each valve body 29 so as to communicate the upstream side and the downstream side of each intake passage 7. A valve piece 41 that variably adjusts the flow of intake air according to the operating state of the engine extends in the valve body axial direction and is integrally connected to the circular wall portions 39 on both sides in the valve body axial direction of the through passage 37. . The circular wall portions 39 are integrally bridged so that a flat plate-shaped reinforcing bridge portion 43 is positioned on the center line of the valve body 29 and parallel to the valve piece portion 41. The length of the reinforcing bridge portion 43 in the direction orthogonal to the valve body axis is set to be shorter than the outer diameter of the rotary valve 21, and one end portion 43 a of the reinforcing bridge portion 43 in the direction orthogonal to the valve body axis is rotary. It is located on substantially the same plane as the outer peripheral surface of the valve 21. On the other hand, the other end 43 b is spaced inward from the outer peripheral surface of the rotary valve 21.

  The drive shaft 33 is drivingly connected to the drive motor (not shown), and the rotary valve 21 is rotated in the intake casing 3 by transmitting the rotational torque of the drive motor, depending on the operating state of the engine. The flow of intake air is variably adjusted by changing the cross-sectional area of the intake passage 7.

  As shown in FIG. 7, the collar member 5 side periphery of the collar through hole 13a is formed with a seal member recess 57 that is recessed from the periphery. The concave portion 57 for the seal member has an inner diameter gradually increasing toward the cylinder head 5 side. A head-side annular seal member 59 is fitted into the seal member recess 57, and the head-side annular seal member 59 is in contact with the periphery of the head-side opening 51.

  As shown in FIG. 8, the head-side annular seal member 59 has an outer diameter that gradually increases from the distal end in the insertion direction toward the cylinder head 5 so as to correspond to the seal member recess 57. An annular protrusion 59a is formed on the outer surface and the inner surface of the head side annular seal member 59 on the front end side in the insertion direction.

  On the other hand, as shown in FIG. 7, an annular recess 55a is formed on the outer periphery of the end of the collar member 55 opposite to the cylinder head 5, and the counter head is in contact with the inner surface of the collar through hole 13a. For example, an O-ring 61 is fitted as a side annular seal member.

-Assembly procedure-
A procedure for assembling the intake manifold 15 and the intake casing 3 to the cylinder head 5 will be described.

  First, the O-ring 61 is fitted into the annular recess 55a.

  Next, the collar member 55 is inserted from the side of the intake manifold 15 of the collar through-hole 13a.

  Next, the head-side annular seal member 59 is press-fitted into the seal member recess 57.

  Thereafter, the lower flange 11 of the intake casing 3 is overlaid on the upper surface of the cylinder head 5, and the flange 17 of the intake manifold 15 is overlaid on the upper flange 9 of the intake casing 3.

  Next, after the first bolt 98 is inserted into the mounting hole 17a of the intake manifold 15, it is fastened to an insert nut (not shown) press-fitted into the intake manifold mounting hole 9a to connect the intake manifold 15 and the intake device 1. .

  Next, the second bolt 99 is inserted into the collar through hole 13 a of the boss portion 13 of the intake casing 3 and fastened to the intake device mounting screw hole 5 a formed in the cylinder head 5. In this way, the intake manifold 15 and the intake casing 3 are assembled integrally with the cylinder head 5.

-Effect of Embodiment 1-
Therefore, according to the mounting structure 10 of the intake device 1 according to the present embodiment, the head-side annular seal member 59 is fitted into the seal-member recess 57 on the peripheral edge of the cylinder head 5 of the collar through-hole 13a. 59 is brought into contact with the periphery of the head side opening 51. For this reason, air that does not pass through the air cleaner is not mixed into the intake passage 7 from the collar through-hole 13a on the head side opening 51 side, so foreign matter and the like are not mixed and the amount of intake air is stabilized. Can be prevented. In addition, since the outer periphery of the collar member 55 exposed in the intake passage 7 is not covered with resin, an increase in air resistance can be prevented. Furthermore, by molding the intake casing 3 with resin, the mass can be reduced and the manufacturing cost can be reduced as compared with a metal such as aluminum.

  In the present embodiment, the head-side annular seal member 59 is surely brought into contact with the cylinder head 5 side periphery of the collar through-hole 13a and the outer periphery of the collar member 55. Therefore, it is possible to reliably prevent the intake and exit of the intake air and prevent the engine rotation from being disturbed.

  In the present embodiment, an annular protrusion 59 a provided on the outer surface of the head-side annular seal member 59 in the insertion direction front end abuts the seal member recess 57, and an annular protrusion 59 a provided on the inner surface of the collar member 55. Since it is in contact with the outer periphery, the gap between the collar through-hole 13a and the collar member 55 can be reliably closed to prevent the intake / exit of the intake air from the collar through-hole 13a, and the engine rotation can be prevented more reliably. .

  In the present embodiment, for example, an O-ring 61 is fitted on the outer periphery of the end of the collar member 55 opposite to the cylinder head 5 as an anti-head-side annular seal member, and the O-ring 61 is brought into contact with the inner surface of the collar through hole 13a. Yes. For this reason, it is possible to prevent intake air from entering and exiting from the collar through-hole 13a on the side opposite to the cylinder head 5 and to prevent disturbance of engine rotation. Further, since the O-ring 61 is fitted on the outer periphery of the collar member 55, the structure is simplified and the O-ring 61 can be easily attached.

(Embodiment 2)
10 and 11 show an intake device mounting structure 110 according to Embodiment 2 of the present invention, which is different from Embodiment 1 in that the intake device is an intake manifold 101.

  The intake manifold 101 of the present embodiment is for a three-cylinder engine and includes a resin molded product intake casing 103 in which an intake passage 107 is formed. The intake passage 107 is branched into three on the downstream side, and each intake passage 107 communicates with the head side opening 51 of the cylinder head 5.

  As shown in FIG. 11, a mounting hole 117 a is formed in the flange 117 of the intake manifold 101. An intake device side opening 153 is formed in the portion corresponding to the head side opening 51 in the intake casing 103, and the portion corresponding to the intake device mounting screw hole 5 a of the cylinder head 5 passes through the intake passage 107 on the opposite side. A through-hole 113a for a collar penetrating to the wall surface is formed. A metal collar member 55 similar to that of the first embodiment is inserted into the collar through hole 113a. Further, a collar 155 shorter than the collar member 55 is fitted into the mounting hole 117a.

  As in the first embodiment, the periphery of the collar through hole 113a on the cylinder head 5 side is formed with a seal member recess 57 that is recessed from the periphery, and the seal member recess 57 has the same head side as in the first embodiment. An annular seal member 59 is fitted. The head side annular seal member 59 is in contact with the periphery of the head side opening 51. In FIG. 11, the head-side annular seal member 59 represents a shape before press-fitting.

  An annular recess 55a is formed on the outer periphery of the end portion of the collar member 55 opposite to the cylinder head 5, and an O-ring 61 that contacts the inner surface of the collar through hole 113a is fitted into the annular recess 55a.

  In order to attach the intake manifold 101 configured as described above to the cylinder head 5, first, as in the first embodiment, the collar member 55 in which the O-ring 61 is fitted is inserted into the through-hole 113a for the collar and used for the seal member. The head side annular seal member 59 is press-fitted into the recess 57.

  Next, the flange 117 of the intake manifold 101 is overlaid on the upper surface of the cylinder head 5.

  Next, after the first bolt 98 is inserted into the mounting hole 117a of the intake manifold 15, it is fastened to the intake device mounting screw hole 5a.

  Next, the second bolt 99 is inserted into the collar through hole 113a and fastened to the intake device mounting screw hole 5a. As a result, the intake manifold 101 is assembled, and the head-side annular seal member 59 comes into contact with the periphery of the head-side opening 51.

-Effect of Embodiment 2-
Therefore, also in the intake device mounting structure 110 according to the present embodiment, the same effects as those of the first embodiment can be obtained, and intake / outflow of the intake air can be prevented to prevent engine rotation disturbance.

(Other embodiments)
The present invention may be configured as follows for each of the above embodiments.

  That is, in each of the above embodiments, the variable intake device and the intake manifold have been described as the intake device. However, the present invention is not limited to these, and any intake device that has an intake passage and is attached to the cylinder head of the engine can be used. Can be applied.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

It is a perspective view which shows the attachment structure of the intake device concerning Embodiment 1 of this invention. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. FIG. 3 is a view corresponding to FIG. 2 of an intake casing. FIG. 4 is a view corresponding to FIG. 3 of the intake casing. It is a perspective view which shows a rotary valve. It is the VII-VII sectional view taken on the line of FIG. It is an expanded sectional view of a head side annular seal member. It is a perspective view which shows the attachment structure of the intake device concerning Embodiment 1 of this invention. It is a perspective view which shows the attachment structure of the intake device concerning Embodiment 2 of this invention. It is the XI-XI sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake device 3 Intake casing 5 Cylinder head 5a Screw hole 7 Intake passage 13a Color through-hole 51 Head side opening 53 Intake device side opening 55 Color member 55a Annular recess 57 Seal member recess 59 Head side annular seal member 59a Protrusion 61 O-ring 99 Second bolt (fastening member)
101 Intake manifold (intake device)
103 Intake casing 107 Intake passage 113a Color through hole 153 Intake device side opening 157 Seal member recess

Claims (4)

In an intake device mounting structure in which an intake device having an intake passage is attached to a cylinder head of an engine,
In the cylinder head, a screw hole for attaching the intake device is formed on the periphery of the head side opening connected to the intake port,
The intake device includes a resin molded product intake casing in which the intake passage is formed.
An intake device side opening communicating with the intake passage is formed in a portion corresponding to the head side opening in the intake casing, and a portion corresponding to the screw hole is passed through the intake passage to the opposite wall surface. A through-hole for the collar to penetrate is formed,
A metal collar member is inserted through the collar through hole,
By inserting a fastening member into the collar member and fastening to the screw hole, the intake device is configured to be attached to the cylinder head,
The cylinder head side periphery of the through hole for the collar is formed with a recess for a seal member that is recessed from the periphery,
An intake device mounting structure, wherein a head-side annular seal member is fitted into the seal member recess, and the head-side annular seal member is in contact with the periphery of the head-side opening. In the mounting structure of the intake device according to claim 1,
The recess for the seal member gradually increases in inner diameter toward the cylinder head side,
An intake device mounting structure, wherein the head-side annular seal member has an outer diameter that gradually increases from the distal end in the insertion direction toward the cylinder head so as to correspond to the recess for the seal member. In the mounting structure of the intake device according to claim 2,
An intake device mounting structure, wherein an annular protrusion is formed on an outer surface and an inner surface of the head-side annular seal member on the distal end side in the insertion direction. In the attachment structure of the intake device according to any one of claims 1 to 3,
An annular recess is formed in the outer periphery of the end opposite to the cylinder head of the collar member, and an anti-head-side annular seal member that is in contact with the inner surface of the collar through hole is fitted into the annular recess. Intake device mounting structure.

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