JP2003314390A - Joint structure of manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a shock absorbing performance from the upper part without restricting the design freedom degree in an engine room. <P>SOLUTION: A protrusion part 12 to be engaged with an engagement claw 31 of an engagement/disengagement hook 30 journaled to a journal part 22 of an intake port 21 is formed on a flange 11 in the side of an intake manifold 10, the engagement claw 31 of the engagement/disengagement hook 30 is engaged with the protrusion part 12 to retain the joint state. When a shock load is inputted to a main pipe 14 of the intake manifold 10 by the deformation of a hood outer panel 40, the engagement of the engagement/disengagement hook 30 is released, the main pipe 14 is lowered to the upper surface of an engine body 20, and the deformable space of the hood outer panel 40 is enlarged. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manifold joint structure, and more particularly, to an improvement in a joint structure between a manifold and an engine port.

[0002]

2. Description of the Related Art Conventionally, when an impact load is input to a vehicle, a part of the vehicle body is deformed, and the impact energy is absorbed and alleviated at the deformed part.

For example, in the one disclosed in Japanese Patent Laid-Open No. 2001-270468, the mounting hinge of the hood that covers the upper surface of the engine room is deformed to absorb and absorb impact energy.

Further, the impact energy that can be absorbed by a part of the deformation becomes large as the degree of deformation becomes large.

Therefore, it is preferable to design the structure of the vehicle in consideration of deformation in advance from the viewpoint of improving the impact energy absorption performance.

This also applies to the above-mentioned hood that covers the upper surface of the engine room. When an impact load is applied to the hood from the outside, the hood is largely deformed so that the impact energy is absorbed and alleviated well. Can be made.

[0007]

When the hood is deformed downward, the deformed hood projects into the engine room.

Therefore, it is necessary to form a shock absorbing space in the engine room so as not to prevent the deformed hood from protruding.

However, the size and arrangement of the housing components such as the engine body housed in the engine room are
The vehicle performance and the commercial property are also determined, and the molding of the engine room and the like are also determined based on such various conditions.

Therefore, it is not always necessary to secure a large shock absorbing space in the engine room,
Each component housed in the engine room can be made compact, and the degree of design freedom in the engine room (modeling freedom)
Can not be restricted.

The present invention has been made in view of the above circumstances.
An object of the present invention is to provide a manifold joint structure capable of improving impact absorption performance from above without limiting the degree of freedom of design in the engine room.

[0012]

In order to solve the above-mentioned problems, in the manifold joint structure according to claim 1 of the present invention, at least a part of the structure is provided above the engine body through the upper surface of the engine body and a predetermined space. A joint structure of a manifold joined to a port of the engine so as to extend,
An engagement / disengagement means for disengaging the joint between the manifold and the port by inputting a load for displacing at least a part of the lower portion is provided.

Here, "at least a part of the manifold extends above the engine body" does not require that the entire manifold be above the engine body, and what is above the engine body is the manifold. It means that only a part such as the main pipe portion of the whole is sufficient.

Further, "extending above the engine body through a predetermined space from the upper surface of the engine body" means that there is a predetermined gap between the upper surface of the engine and the part of the manifold. Means that.

Furthermore, the "input of the load for displacing at least a part of the downward direction" is not limited to the direct input of the load to the at least part itself.

That is, "at least a part" is a portion extending above the engine, but as a result of the load being applied to a portion of the entire manifold that is not above the engine, It also means that the load is transmitted to the “at least part” and indirectly input as a load for displacing the “at least part” downward.

The manifold is not limited to the intake manifold, which is the intake manifold, but may be the exhaust manifold, which is the exhaust manifold.

According to the manifold joint structure of the first aspect of the present invention thus constructed, at least a part of the manifold extending above the engine is directly or indirectly connected to the manifold. When a load for displacing at least a part of the
Remove the connection between the manifold and the engine port.

As a result, the manifold loses the supporting force received from the engine port, and a part of the manifold extending above the engine falls on the upper surface of the engine.

The space in which the hood covering the upper surface of the engine room can be deformed downward and protruded by at least this drop difference can be substantially expanded.

Therefore, this expanded space functions as a shock absorbing space capable of absorbing energy due to a shock load, and can absorb a larger amount of shock energy than conventional.

Moreover, since it is not necessary to change the size or arrangement of the engine body or the like housed in the engine room, the shock absorbing performance from above can be improved without limiting the degree of freedom in designing in the engine room. be able to.

Further, since it does not increase the distance between the hood and the manifold, for example, by raising the hood installation height position, it may occur due to the hood installation height position moving upward. The visibility from the passenger seats in the passenger compartment is not deteriorated.

According to a second aspect of the present invention, in the joint structure for a manifold, the engaging / disengaging means includes an engaged portion formed on one side of the manifold and the port.
One part is rotatably supported on the other side of the manifold and the port, and the other part is an engagement / disengagement member having an engagement part that engages with the engaged part. The joining structure of the manifold according to claim 1, wherein the engagement between the engaging portion and the engaged portion is released by the input of the load.

According to the manifold joint structure of the second aspect, the manifold and the port are in the joined state and engaged and disengaged before the load is applied to at least a part of the joint structure. The joined state is held by the members.

That is, a part of the engagement / disengagement member is rotatably supported on one of the manifold or the port in the joined state, and the other part is formed with the engaging portion formed around the rotatably supported part. Is rotated toward the engaged portion formed on the other side of the manifold or the port, and the engaging portion engages with the engaged portion formed on the other side.

Therefore, the engagement / disengagement member is bridged in a state where the manifold and the port are joined, and the engagement / disengagement member can maintain the joined state of the manifold and the port.

According to the manifold joint structure of the second aspect of the present invention, the load directly or indirectly acts on at least a part of the manifold so that the engaging / disengaging member receives the load. The load acts to disengage the engaging portion of the engaging / disengaging member from the engaged portion of the manifold or the port.

As a result, the engagement / disengagement member does not maintain the joint state between the manifold and the port, and the joint between the manifold and the port is released by the downward load acting on at least a part of the manifold. You can

Further, since the engaging / disengaging member is rotatably supported in advance on one of the manifold and the port, the engaging portion is grasped by a finger and rotated to the other side, Only by engaging this engaging portion with the engaged portion on the other side, the joined state of the manifold and the port can be maintained.

That is, it is not necessary to fasten and fix the manifold and the port with bolts / nuts using a tool as in the conventional case, and the work of joining the manifold and the port can be facilitated.

Further, even in the case of manually separating the manifold and the port in the joined state, it can be carried out only by disengaging the engaging portion and the engaged portion. Can be facilitated.

In the joint structure for a manifold according to a third aspect of the present invention, the engagement / disengagement means includes engaged parts formed on the manifold and the port, and the engaged parts of the manifold. And an engaging / disengaging member having a plurality of engaging portions that engage with the engaged portion of the port so as to be bridged, and by inputting the load,
The manifold joining structure according to claim 1, wherein the engagement between the engaging portion and the engaged portion is released.

According to the manifold joint structure of the third aspect, the manifold and the port are in a joined state and engaged and disengaged before the load is applied to the at least a part. The joined state is held by the members.

That is, the engaging portion of the engagement / disengagement member is engaged with the engaged portion of the manifold and the engaged portion of the port so that the engagement / disengagement member bridges the manifold and the port in the joined state. Engage each.

Therefore, the engagement / disengagement member is bridged in a state where the manifold and the port are joined, and the engagement and disengagement member holds the joined state of the manifold and the port.

According to the manifold joint structure of the third aspect, the load directly or indirectly acts on at least a part of the manifold so that the engaging / disengaging member receives the load. The load acts to disengage the engaging portion of the engaging / disengaging member from the engaged portion of the manifold or the engaged portion of the port.

As a result, the engagement / disengagement member does not maintain the joint state between the manifold and the port, and the joint between the manifold and the port is released by the downward load acting on at least a part of the manifold. You can

Further, the engagement / disengagement member can maintain the joined state of the manifold and the port only by engaging the engaged portions with the engaged portions of the manifold and the port.

That is, it is not necessary to use a tool to fasten and fix the manifold and the port with bolts / nuts as in the conventional case, and the work of joining the manifold and the port can be facilitated.

Further, even in the case of manually separating the manifold and the port in the joined state, it can be carried out only by disengaging the engaging portion and the engaged portion. Can be facilitated.

When the conventional engine main body port and manifold have flanges at their joints, the flange itself functions as an engaged portion to allow the engine main body to function. It is not necessary to modify the or manifold such as newly forming an engaged portion, and thus it is possible to suppress an increase in manufacturing cost and to apply it to a vehicle already manufactured.

Further, in the manifold joint structure according to a fourth aspect of the present invention, the engine main body is provided with an ignition plug substantially directly below the at least a part thereof. It is characterized by the joint structure of the manifold.

According to the manifold connecting structure of the fourth aspect, the manifold extending above the spark plug needs to be moved for inspection and replacement of the spark plug. Even in such a case, the engagement between the engaging portion and the engaged portion of the engagement / disengagement member can be easily released manually without using a special tool.

After the engagement portion and the engaged portion are disengaged, the manifold and the port can be separated and the manifold can be moved from above the ignition plug.

Further, even after the re-joining, the engaging portion and the engaged portion can be easily engaged with each other manually.

[0047]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a manifold joining structure according to the present invention will be described below with reference to the drawings.

In the joint structure of the intake manifold 10 according to the embodiment shown in FIG. 1, the top surface is the hood outer panel 4.
This is a joint structure of the intake port 21 of the engine body 20 and the intake manifold 10 in the engine room covered by 0.

First, the positional relationship and shape of the engine body 20, the intake manifold 10 and the hood outer panel 40 will be described.

First, the inclination angle α of the intake port 21 leading to a cylinder (not shown) is set as an angle according to the performance and structure of the engine body 20.

Further, the radius of curvature R of the intake manifold 10 connected to the intake port 21 is such that the output loss of the engine body 20 caused by the intake resistance of the gas flowing in the duct of the intake manifold 10 falls within the allowable range. Is set to.

On the other hand, the main pipe portion 14 of the intake manifold 10
The straight line length f is set as a length required for connection with an air element or the like (not shown).

Further, the main pipe portion 1 of the intake manifold 10
The crossing angle β between 4 and the intake port 21 is set so that the intake manifold 10 has an optimum component arrangement in view of the relationship with the straight line length f of the main pipe portion 14 of the intake manifold 10.

The distance L1 between the upper surface of the engine body 20 and the lower surface of the main pipe portion 14 of the intake manifold 10 is the inclination angle α, the intersection angle β, the radius of curvature R, the straight line length f, and the intake manifold 10. Is determined according to the inner diameter (diameter) d of the main pipe portion 14 and the height H to the upper surface of the engine body 20.

A predetermined gap L2 is preset between the intake manifold 10 and the hood outer panel 40.

Intake manifold 10 and intake port 2
1 is joined via a gasket 27 for ensuring the airtightness of the joining surface between the intake manifold 10 and the intake port 21, as shown in detail in FIG. .

A flange 11 is formed at the joint of the intake manifold 10.

The outer edge of the flange 11 has
An engaging claw (engaging portion) 31 of an engaging / disengaging hook (engaging / disengaging member) 30, which will be described later, rides over and engages with each other, and a raised portion (engaged portion) 12 that gives a moderation feeling of engagement / disengagement is formed. There is.

An annular boss 13 is formed on the joint surface of the flange 11, while an annular groove 23 fitted to the boss 13 on the intake manifold 10 side is formed on the joint surface on the intake port 21 side. Has been formed.

By fitting the boss 13 and the groove 23, the intake manifold 10 and the intake port 21 are positioned in the joint surface, and the intake manifold 10 and the intake port 21 are directed in the joint surface inward direction. To prevent relative movement.

Of the joints between the intake manifold 10 and the intake ports 21, one end of the engaging / disengaging hook 23 is pivotally supported at the joint on the intake port 21 side.
A shaft support portion 22 that rotatably supports the engagement / disengagement hook 23 is formed.

On the other hand, one end of the engagement / disengagement hook 30 is rotatably supported by the shaft support portion 22 of the intake port 21, and the other end corresponding to the outside of the rotation locus is provided with a flange. Engaging claws 3 that engage with the raised portion 12 of 13
1 and a finger hook portion 32 on which a finger is put in order to manually engage the engaging claw 31 with the raised portion 12 or to manually remove it from the raised portion 12.

In the state where the intake manifold 10 and the intake port 21 are joined, the joined state of the intake manifold 10 and the intake port 21 is maintained when the engaging claw 31 is engaged with the raised portion 12. In the state where the engaging claw 31 is disengaged from the raised portion 12, the intake manifold 1
0 is out of the intake port 21.

Further, the engaging claws 31 of the engagement / disengagement hook 30 are not disengaged from the raised portion 12 in a normal use state of the vehicle having the joint structure of the intake manifold 10, and the engagement / disengagement hook 30. It has sufficient strength so that it will not be damaged.

On the other hand, when a load for displacing the main pipe portion 14 extending above the engine body 20 of the intake manifold 10 acts on any portion of the intake manifold 10, it is indicated by a chain double-dashed line. As shown, the engagement claw 31 of the engagement / disengagement hook 30 is set so as to get over the raised portion 12 and come off.

Next, the operation of the joining structure of the intake manifold 10 according to this embodiment will be described with reference to FIG.

First, when the impact load S acts on the hood outer panel 40 due to a fallen object or the like from above the hood outer panel 40, the hood outer panel 40 is deformed by the impact energy of the impact load S.

At this time, the hood outer panel 40 is
Although the impact energy is absorbed by the deformation, as shown in FIG. 2A, as a first stage of the deformation, the impact energy is deformed downward to a position in contact with the upper surface of the intake manifold 10 (represented by a solid line).

At this time, the displacement due to the deformation of the hood outer panel 40 is substantially equal to the distance L2 of the space formed between the position before deformation (represented by the chain double-dashed line) and the position of the upper surface of the intake manifold 10. .

Of the impact energy input to the hood outer panel 40, the impact energy corresponding to the displacement due to this deformation is absorbed.

Therefore, when all of the input impact energy is absorbed by the deformation of the hood outer panel 40, the deformation of the hood outer panel 40 does not proceed any further, and the intake manifold 10 and the intake port 2 are not further advanced.
The engagement / disengagement hook 30 that holds the connection with 1 cannot be removed.

On the other hand, when the input impact energy is large, the impact load S passes through the deformed hood outer panel 40 of the intake manifold 10 through the first step shown in FIG. It acts downward on the main pipe portion 14.

As a result, a rotational moment acts on the joint between the intake manifold 10 and the intake port 21 as shown in FIG. 2B, and a tensile load acts on the engagement / disengagement hook 30.

By this tensile load, the engaging claws 31 (see FIG. 1B) of the engaging and disengaging hooks 30 ride over the ridges 12 of the intake manifold 10 and the engaged state is released.

As a result, the engagement / disengagement hook 30 no longer holds the joined state between the intake manifold 10 and the intake port 21, and the intake manifold 10 loses the support force received from the intake port 21.

The main pipe portion 1 of the intake manifold 10
Due to the impact load S continuously applied to the intake manifold 4, the intake manifold 10 is tilted until the main pipe portion 14 of the intake manifold 10 comes into a position in contact with the upper surface of the engine body 20.

At this time, the main pipe portion 14 of the intake manifold 10 descends by a distance L1 from the upper surface of the engine body 20, and the space distance between the upper surface of the main pipe portion 14 and the hood outer panel 40 before the deformation. Is L3 as shown
(> L2).

Therefore, the deformable space of the hood outer panel 40 is substantially expanded, and the hood outer panel 40 is largely deformed as compared with the state shown in FIG. 2 (a).

Therefore, the performance of absorbing impact energy due to the deformation of the hood outer panel 40 is improved.

As described above, according to the joint structure of the intake manifold 10 according to the present embodiment, the intake manifold 1
By removing 0 from the intake port 21, it is possible to absorb a larger impact energy than before.

Moreover, since it is not necessary to change the size and arrangement of the engine main body 20 and the like housed in the engine room from the conventional one, the degree of freedom in designing in the engine room is not limited.

Further, since it is not necessary to increase the distance between the hood outer panel 40 and the intake manifold 10 by elevating the installation height position of the hood outer panel 40, the installation height position of the hood outer panel 40 is not required. There is no possibility that the visibility from the passenger seat in the passenger compartment may deteriorate due to the movement of the vehicle.

In the joint structure of the intake manifold 10 according to the present embodiment, the engagement hook 30 is connected to the intake port 21.
However, on the contrary to this, a shaft supporting portion is provided on the intake manifold 10 side to support the engagement / disengagement hook 30 on this shaft supporting portion, and a rising portion is provided on the intake port 21 side. A configuration in which the formed flange is formed may be adopted, and the same operation and effect as those of the above-described embodiment can be obtained.

Further, as shown in FIG. 1, an ignition plug 29 is arranged in the combustion chamber of the engine body 20,
The spark plug 29 is inserted into the plug hole 28 extending from the upper surface of the engine main body 20 to the combustion chamber from the open end on the upper surface side of the engine main body 20 and attached.

For inspection or replacement, the once installed spark plug 29 is removed from the engine body and then mounted again on the engine body. From the open end on the upper surface of the engine body 20, a tool such as a plug wrench is used. Need to be inserted.

Therefore, when the intake manifold 10 extends above the engine body 20, it is preferable to temporarily remove the intake manifold 10 from the intake port 21 so that the upper side of the engine is wide open.

In this case, in the conventional joint structure of the intake manifold, the intake manifold and the intake port are joined by fastening the bolts / nuts. , It was necessary to refasten the bolt / nut.

However, the work of unfastening and refastening the bolts / nuts as described above has been troublesome as an incidental work for checking and replacing the spark plug 29.

On the other hand, in the joint structure of the intake manifold according to this embodiment, the finger hook 3 of the engagement / disengagement hook 30 is used.
With a simple operation of turning the engagement / disengagement hook 30 by hooking the finger on 2 or picking the finger hook 32 with the finger,
The intake manifold 30 can be joined / released,
Moreover, since it can be performed only with fingers without using a tool, the workability of attaching and detaching the intake manifold can be significantly improved as compared with the conventional case.

Incidentally, the engagement / disengagement hook 3 according to the present embodiment.
When the load is applied to the intake manifold 10 downward, 0 disengages by rotating the intake manifold 10. However, as another form, the intake manifold 10
Alternatively, when a predetermined load is applied downward, the engagement hook 30 itself may be cut, broken, or extended to release the joining between the intake manifold 10 and the intake port 21.

In this case, the breaking strength, the breaking strength, the stretching length, etc. of the engagement / disengagement hook 30 may be experimentally obtained in advance and set.

[0092]

[Modification] An intake manifold 1 which is a modification shown in FIG.
The joining structure of No. 0 is basically the same as that of the embodiment shown in FIG. 1, but the intake manifold 1 of the above embodiment is used.
The joint structure of 0 has a structure in which one end of the engagement / disengagement hook 30 is pivotally supported by the intake port 21 or the intake manifold 10, whereas the intake manifold 10 according to this modification example.
In the structure of, the intake manifold 10 and the intake port 2
The flanges 11 and 24 are formed on both of the flanges 1, and the engagement / disengagement hook 30 is configured to be detachably engaged with the flanges 11 and 24.

The raised portions 12 and 25 are formed on the flange 11 of the intake manifold 10 and the flange 24 of the intake port 21, respectively, and the engagement / disengagement hook 30 joins the intake manifold 10 and the intake port 21 to both ends, respectively. In this state, the engaging claws 31 are provided so as to be bridged over and engaged with both the raised portions 12 and 25. The engagement between the engaging claws 31 and the raised portions 12 and 25 is the Main pipe portion 14 extending above the engine body 20
Is set so that when a load for displacing the valve is applied to any part of the intake manifold 10, the load disengages and falls as indicated by the chain double-dashed line.

According to the joining structure of the intake manifold 10 according to the modified example configured as described above, the impact load S is caused by a fallen object or the like from above the hood outer panel 40, as in the above-described embodiment. When acting on the hood outer panel 40, the hood outer panel 40
Is deformed by the impact energy of the impact load S.

When the impact load S acts downward on the main pipe portion of the intake manifold 10 via the hood outer panel 40, a rotational moment acts on the joint between the intake manifold 10 and the intake port 21. ,
The engaging claw 31 of the engagement / disengagement hook 30 is provided on the intake manifold 10.
Over the rising portion 12 or the rising portion 25 of the intake port 21, and falls off from the intake manifold 10 and the intake port 21 as shown by the chain double-dashed line.

As a result, the engagement / disengagement hook 30 no longer holds the joined state between the intake manifold 10 and the intake port 21, and the intake manifold 10 loses the support force received from the intake port 21.

The main pipe portion 1 of the intake manifold 10
Due to the impact load S continuously applied to the intake manifold 4, the intake manifold 10 is tilted until the main pipe portion 14 of the intake manifold 10 comes into a position in contact with the upper surface of the engine body 20.

At this time, the main pipe portion 14 of the intake manifold 10 descends by a distance apart from the upper surface of the engine body 20, and the upper surface of the main pipe portion 14 after the lowering and the hood outer panel 40 before the deformation are separated. The space distance therebetween is increased, and the deformable space of the hood outer panel 40 is substantially expanded.

Therefore, the performance of absorbing impact energy due to the deformation of the hood outer panel 40 is improved.

As described above, the joining structure of the intake manifold 10 according to the modified example can absorb a larger amount of impact energy than the conventional one.

Moreover, since it is not necessary to change the size and arrangement of the engine main body 20 and the like housed in the engine room from the conventional one, the degree of freedom in designing in the engine room is not limited.

The engagement / disengagement hook 30 in the structure of the intake manifold 10 according to this modification is also cut, broken, or stretched when a predetermined load acts on the intake manifold 10 downward. The joining between the intake manifold 10 and the intake port 21 may be released.

Further, although the embodiment and the modified examples described above are the joining structure of the intake manifold 10, the joining structure of the manifold of the present invention is not limited to the intake side manifold, and the exhaust side manifold. Is also applicable.

[0104]

As described above, according to the first aspect of the present invention.
According to the manifold joint structure according to the first aspect, the space in which the hood that covers the upper surface of the engine room is deformed downward and can be projected can be substantially expanded.

Therefore, this expanded space functions as a shock absorbing space capable of absorbing energy due to a shock load, and can absorb a larger amount of shock energy than conventional.

Moreover, since it is not necessary to change the size or arrangement of the engine body or the like housed in the engine room, the shock absorbing performance from above can be improved without limiting the degree of design freedom in the engine room. be able to.

Further, since the hood installation height position is not raised to increase the distance between the hood and the manifold, it may occur when the hood installation height position moves upward. The view from the passenger seats will not be reduced.

According to the manifold joining structure of the second aspect of the present invention, the engaging / disengaging member joins the manifold and the port by the load acting directly or indirectly on at least a part of the manifold. The state is not maintained, and the downward load acting on at least a part of the manifold hold can release the connection between the manifold and the port.

Further, since the engagement / disengagement member is rotatably supported in advance on one of the manifold and the port, the engaging portion is grasped by a finger and rotated to the other side, Only by engaging this engaging portion with the engaged portion on the other side, the joined state of the manifold and the port can be maintained.

That is, it is not necessary to use a tool to fasten and fix the manifold and the port with bolts / nuts as in the prior art, and the work of joining the manifold and the port can be facilitated.

Further, even in the case of manually separating the manifold and the port in the joined state, it can be carried out simply by disengaging the engaging portion and the engaged portion. Can be facilitated.

According to the manifold joining structure of the third aspect of the present invention, the engaging / disengaging member joins the manifold and the port by the load acting directly or indirectly on at least a part of the manifold. The state is no longer maintained, and the downward load acting on at least a part of the manifold can release the connection between the manifold and the port.

Further, the engagement / disengagement member can maintain the joined state of the manifold and the port only by engaging the engaged portions with the engaged portions of the manifold and the port.

That is, it is not necessary to fasten and fix the manifold and the port with bolts / nuts by using a tool as in the conventional case, and the work of joining the manifold and the port can be facilitated.

Furthermore, even when the work of manually separating the manifold and the port in the joined state is performed, the work can be performed simply by disengaging the engaging portion and the engaged portion. Can be facilitated.

When the conventional engine main body port and manifold have flanges at their joints, the flange itself functions as an engaged portion to allow the engine main body to function. It is not necessary to modify the or manifold such as newly forming an engaged portion, so that it is possible to suppress an increase in manufacturing cost and to apply it to a vehicle already manufactured.

According to the manifold joining structure of the fourth aspect of the present invention, it is necessary to move the manifold extending above the spark plug for inspection and replacement of the spark plug. Even in such a case, the engagement between the engaging portion and the engaged portion of the engagement / disengagement member can be easily released manually without using a special tool.

After the engagement between the engaging portion and the engaged portion is released, the manifold and the port can be separated and the manifold can be moved from above the ignition plug.

Further, even after the re-joining, the engaging portion and the engaged portion can be easily engaged manually.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part showing a joint structure of an intake manifold according to an embodiment of the present invention.

FIG. 2 is a schematic view of a main part for explaining the operation of the embodiment.

FIG. 3 is a schematic view of a main part showing a modified example.

[Explanation of symbols]

10 intake manifold 11 flange 12 Raised part (engaged part) 13 Boss 14 Main pipe section 20 engine body 21 intake port 22 Shaft support 23 groove 24 flange 25 climax 27 Gasket 28 Plug hole 29 Spark plug 30 Disengagement hook (disengagement member) 31 Engaging claw (engaging part) 32 finger rest 40 Hood outer panel L1-L3 distance α inclination angle β intersection angle d inner diameter f Straight line length R radius of curvature H height

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuko Fukushima             2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa             Motor Co., Ltd. (72) Inventor Tetsuya Kawajiri             2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa             Motor Co., Ltd.

Claims (4)

[Claims] 1. A joining structure of a manifold joined to a port of the engine so that at least a part thereof extends above the engine body through a predetermined space from an upper surface of the engine body. A manifold joining structure, comprising engagement / disengagement means for releasing the joining between the manifold and the port by inputting a load that displaces at least a part of the manifold downward. 2. The engagement / disengagement means includes an engaged portion formed on one side of the manifold and the port, and a part of which is rotatable on the other side of the manifold and the port. And an engaging / disengaging member having an engaging portion that engages with the engaged portion while being pivotally supported on the engaging portion and the engaged portion by the input of the load. 2. The manifold joint structure according to claim 1, wherein the engagement is disengaged. 3. The engagement / disengagement means is bridged over engaged parts formed in the manifold and the port, and the engaged part of the manifold and the engaged part of the port. 2. The engagement / disengagement member having a plurality of engaging portions respectively engaged with each other, the engagement between the engaging portion and the engaged portion is released by the input of the load. The junction structure of the manifold described in. 4. The manifold joining structure according to claim 1, wherein the engine body is provided with an ignition plug substantially directly below the at least a part.