JP2006037784A - Intake manifold structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake manifold structure capable of compatibly securing sufficient crash stroke at a time of crash and sufficient pressure resistance at a time of occurrence of back fire. <P>SOLUTION: A resin intake manifold 12 is connected to a vehicle body rearward side surface of an internal combustion engine 10 arranged transversely in relation to a traveling direction of an automobile. A projection 15 transmitting impact at a time of crash locally on the intake manifold and create an origin of break is provided at a rear end section of each intake pipe 12a of the intake manifold 12 furthest in a vehicle rearward direction from the internal combustion engine. Break starts from each intake pipe which is an attachment part of the projection by contact of the projection on a dash panel D in vehicle rearward of the intake manifold at a time of crash. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an intake manifold structure, and more particularly, to a measure for achieving both of ensuring a crash stroke at the time of a collision and ensuring sufficient pressure resistance when a backfire occurs.

  In general, in an automobile, a structure that can smoothly absorb the impact force at the time of collision by crushing the engine room provided at the front part of the car body or the rear part of the car body in order to reduce the shock in the event of a collision Has been.

In that case, in an automobile in which the internal combustion engine is placed horizontally in a direction perpendicular to the traveling direction of the automobile, the intake manifold is connected to the front side surface of the vehicle body of the internal combustion engine. In the longitudinal direction of the vehicle body, the fragile part extending in the axial direction of the intake manifold is provided in the intake manifold so that the intake manifold is actively destroyed from the fragile part in the event of a collision and is crushed to absorb the impact force. In the prior art, a sufficiently long length (crash stroke) is known (see, for example, Patent Document 1).
Japanese Patent No. 2699915

  By the way, the intake valve is in a state in which a part of the air-fuel mixture left unburned in the expansion stroke of the combustion cycle due to an ignition timing error of the internal combustion engine or a failure of the valve mechanism remains as a fire type in the combustion chamber after exhaust. Opening may ignite a new mixture and cause backfire. This backfire burns in the intake manifold with a sudden pressure rise. Therefore, when the intake manifold is provided with a weak portion extending in the axial direction as in the conventional intake manifold structure, the intake manifold may be damaged starting from the weak portion when a backfire occurs.

  In that case, it may be possible to improve the rigidity of the intake manifold in order to secure the pressure resistance during the occurrence of backfire, but if the rigidity of the intake manifold is improved, the intake air necessary to absorb the impact force at the time of collision will be considered. It is difficult to ensure a sufficient crash stroke of the manifold, and it is difficult to achieve both a sufficient crash stroke at the time of a collision and a sufficient pressure resistance when a backfire occurs.

  The present invention has been made in view of such points, and the object of the present invention is to achieve both a sufficient crash stroke at the time of collision and a sufficient pressure resistance at the time of backfire occurrence. An object of the present invention is to provide an intake manifold structure that can be used.

  In order to achieve the above object, according to the present invention, a resin intake manifold is connected to one side surface of an internal combustion engine that is disposed horizontally with respect to the traveling direction of the automobile, and one side of the intake manifold from the internal combustion engine. Protrusions that are the starting points of destruction by locally transmitting the impact at the time of collision to the intake manifold are provided at the locations apart from each other.

Due to this specific matter, the impact at the time of collision is locally transmitted to the intake manifold by the protrusion provided on the one side of the resin intake manifold away from the internal combustion engine, and becomes a starting point of destruction. For this reason, the aggressive destruction of the intake manifold starting from the protrusion ensures a sufficient length in the longitudinal direction of the vehicle that is crushed to absorb the impact force, and ensures a sufficient crash stroke at the time of collision. It becomes possible.

  Moreover, since the intake manifold is only provided with protrusions, the protrusions cannot be the starting point of destruction in the state where the impact at the time of collision does not act, and the rigidity of the intake manifold is ensured well, and when the backfire occurs It is also possible to ensure sufficient pressure resistance.

  In particular, the following configuration is listed as a specific specification of the connection position of the intake manifold to the internal combustion engine.

  In other words, the intake manifold is connected to the rear side surface of the vehicle body with respect to the internal combustion engine, and is destroyed from the mounting portion of the protrusion by abutment of the protrusion with respect to the structural member or the vehicle body behind the intake manifold in the event of a collision.

  Due to this specific matter, when the protrusion provided on the part of the resin intake manifold that is separated from the internal combustion engine toward the rear of the vehicle body comes into contact with the structural member or the vehicle body behind the intake manifold due to the impact at the time of collision, this protrusion The impact at the time of collision is transmitted locally to the intake manifold via the, and the mounting portion of the projection becomes the starting point of destruction. For this reason, the aggressive destruction of the intake manifold starting from the mounting part of the protrusion ensures a sufficient length in the longitudinal direction of the vehicle that is crushed to absorb the impact force, and ensures a sufficient crash stroke at the time of collision. In addition, when the impact at the time of collision does not act, the mounting part of the projection can not be the starting point of destruction, the intake manifold rigidity is secured well, and the pressure resistance at the time of backfire occurrence is sufficient It is also possible to secure it.

  On the other hand, when the intake manifold is connected to the front side surface of the vehicle body with respect to the internal combustion engine and is destroyed from the attachment portion of the protrusion by the contact of the protrusion with the structural member in front of the vehicle body than the intake manifold at the time of collision When a projection provided in a portion of the resin intake manifold located farther from the internal combustion engine in front of the vehicle body comes into contact with a structural member in front of the vehicle body than the intake manifold due to an impact at the time of collision, Is locally transmitted to the intake manifold, and the mounting portion of the protrusion becomes the starting point of destruction. For this reason, the aggressive destruction of the intake manifold starting from the mounting part of the protrusion ensures a sufficient length in the longitudinal direction of the vehicle that is crushed to absorb the impact force, and ensures a sufficient crash stroke at the time of collision. In addition, when the impact at the time of collision does not act, the mounting part of the projection cannot be the starting point of destruction, and the rigidity of the intake manifold is ensured and the pressure resistance at the time of backfire occurrence is sufficient It is also possible to secure it.

  In addition, the influence on the collision object at the time of the collision can be surely reduced by positive destruction of the intake manifold.

  In short, by providing a protrusion serving as a starting point for destruction by locally transmitting the impact at the time of collision to the intake manifold made of resin connected to one side surface in the front-rear direction of a horizontally mounted internal combustion engine Ensuring sufficient crash stroke at the time of collision by aggressive destruction of the intake manifold starting from the point, and sufficient pressure resistance at the time of occurrence of backfire due to a projection that can not be the starting point of destruction in the absence of impact at the time of collision It is possible to achieve compatibility with

  The best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a partial sectional view of a front portion of an automobile using an intake manifold structure according to an embodiment of the present invention, which is a so-called front arrangement. The internal combustion engine 10 is a four-cylinder internal combustion engine, and is disposed horizontally so that the arrangement direction of the cylinders is in a horizontal direction with respect to the traveling direction (arrow A direction) of the automobile. A radiator 11 is installed in the foremost part of the engine room E partitioned from the vehicle compartment R by the dash panel D. A fan shroud 16 that houses an electric fan 16 a is attached to the rear surface of the vehicle body of the radiator 11 so that outside air is sucked into the engine room E through the radiator 11.

  An intake manifold 12 that supplies intake air to the internal combustion engine 10 is disposed in a space between the internal combustion engine 10 and the dash panel D in the engine room E. As shown in FIG. 2, the intake manifold 12 is made of a resin molded from a resin such as reinforced plastic, and an intake pipe 12 a that is branched into four so as to correspond to each cylinder of the internal combustion engine 10 is attached. The internal combustion engine 10 is connected to the rear side surface of the internal combustion engine 10 via the flange 12b. Further, a fuel injection valve 13 for supplying fuel to the internal combustion engine 10 is disposed at a connection portion between each intake pipe 12 a of the intake manifold 12 and the internal combustion engine 10.

  In the space between the internal combustion engine 10 and the radiator 11 in the engine room E, an exhaust pipe 14 that guides exhaust discharged from the internal combustion engine 10 to the rear of the vehicle body is disposed. The exhaust pipe 14 is connected to the front side surface in the vehicle body traveling direction of the internal combustion engine 10 (the surface opposite to the rear side surface in the vehicle body traveling direction).

  The portion of the intake manifold 12 farthest rearward from the internal combustion engine 10, that is, the rear end portion of each intake pipe 12 a is opposed to the dash panel D as a constituent member at the rear of the vehicle body. At the rear end portion of each intake pipe 12a, a substantially cylindrical projection 15 is provided, one by one, which transmits the impact at the time of collision to the intake manifold 12 (each intake pipe 12a) and serves as a starting point of destruction. ing. Each of the protrusions 15 may be provided integrally when the intake manifold 12 is formed, or may be attached by an adhesive or the like after the intake manifold 12 is formed. In this case, when the intake manifold 12 moves to the rear of the vehicle body together with the internal combustion engine 10 at the time of a collision and the projections 15 of the intake pipes 12a come into contact with the dash panel D, the intake pipes 12a that serve as attachment portions of the projections 15 are provided. It is going to be destroyed from.

  Therefore, in the first embodiment, the protrusion 15 provided at the rear end portion of each intake pipe 12a farthest rearward of the vehicle body from the internal combustion engine 10 of the resin-made intake manifold 12 causes the vehicle body together with the internal combustion engine 10 due to an impact at the time of collision. When it moves rearward and comes into contact with the dash panel D, the impact at the time of collision is locally transmitted to each intake pipe 12a of the intake manifold 12 via each projection 15 and becomes an attachment portion of the projection 15. Each intake pipe 12a becomes a starting point of destruction. For this reason, due to the positive destruction of the intake manifold 12 starting from the intake pipe 12a, which is the attachment portion of each projection 15, a sufficient length in the longitudinal direction of the vehicle body to be crushed for absorbing the impact force is secured. Sufficient crash stroke can be secured.

  In addition, although each intake pipe 12a of the intake manifold 12 is provided with a protrusion 15, each intake pipe 12a serving as a mounting portion of each protrusion 15 can be a starting point of destruction when no impact is applied during a collision. In addition, the rigidity of the intake manifold 12 can be ensured satisfactorily, and the pressure resistance when the backfire occurs can be sufficiently secured.

  This ensures a sufficient crash stroke at the time of collision due to the positive destruction of the intake manifold 12 starting from the intake pipe 12a serving as the attachment portion of each protrusion 15, and the starting point of the breakage in the state of no shock at the time of the collision. It is possible to achieve both the sufficient pressure resistance when the backfire is generated by the projection 15 of each intake pipe 12a that cannot be prevented.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, the arrangement of the intake manifold and the exhaust pipe is changed. The other configurations except for the intake manifold and the exhaust pipe are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in this embodiment, as shown in FIG. 3, the intake manifold 21 is disposed in the space between the internal combustion engine 10 and the fan shroud 16 in the engine room E, and as shown in FIG. Is made of resin such as reinforced plastic, and the intake pipe 21a branched into four for each cylinder of the internal combustion engine 10 has a vehicle body traveling direction of the internal combustion engine 10 via the mounting flange 21b. Each is connected to the front side.

  An exhaust pipe 22 is disposed in the space between the internal combustion engine 10 and the dash panel D in the engine room E, and the exhaust pipe 22 is connected to the rear side surface of the internal combustion engine 10 in the vehicle body traveling direction.

  The portion of the intake manifold 21 farthest from the internal combustion engine 10, that is, the front end portion of each intake pipe 21 a faces the fan shroud 16 as a constituent member in front of the vehicle body, and faces the fan shroud 16. Each front end portion of each intake pipe 21a is provided with a substantially cylindrical protrusion 23 that transmits the impact at the time of collision locally to the intake manifold 21 (each intake pipe 21a) and serves as a starting point for destruction. . Each of the protrusions 23 may be provided integrally when the intake manifold 21 is formed, or may be attached by an adhesive or the like after the intake manifold 21 is formed. In this case, when the protrusions 23 of the intake pipes 21a come into contact with the fan shroud 16 that moves to the rear of the vehicle body together with the radiator 11 in the event of a collision, the intake manifold 21 is destroyed from the intake pipes 21a that are the attachment portions of the protrusions 23. It has come to be.

  Therefore, in the second embodiment, the protrusion 23 provided at the front end portion of each intake pipe 21a farthest from the internal combustion engine 10 of the resin intake manifold 21 to the front of the vehicle body is rearward together with the radiator 11 by the impact at the time of the collision. When abutting against the moving fan shroud 16, the impact at the time of collision is transmitted locally to each intake pipe 21 a of the intake manifold 21 through each projection 23, and each intake pipe serving as a mounting portion for the projection 23. 21a becomes a starting point of destruction. For this reason, due to the positive destruction of the intake manifold 21 starting from the intake pipe 21a serving as the attachment portion of each projection 23, a sufficient length in the longitudinal direction of the vehicle body to be crushed for absorbing the impact force is ensured. In addition, it is possible to ensure a sufficient crash stroke at the time, and in a state where the impact at the time of collision does not act, the intake pipe 21a serving as the mounting portion of each projection 23 cannot be a starting point of destruction, and the rigidity of the intake manifold 21 is increased. It can be ensured satisfactorily and sufficient pressure resistance when backfire occurs can be secured. As a result, it is impossible to secure a sufficient crash stroke at the time of collision by the active destruction of the intake manifold 21 starting from the projection 23 of each intake pipe 21a, and to be the starting point of the failure in the state where the shock is not applied at the time of the collision. It is possible to achieve both the sufficient pressure resistance when the backfire is generated by the projection 23 of each intake pipe 21.

  In addition, the influence on the object at the time of the collision can be surely reduced by positive destruction of the intake manifold 21.

In addition, this invention is not limited to said each embodiment, The other various modifications are included. For example, in the first embodiment, the case where the protrusion 15 of each intake pipe 12a abuts against the dash panel D due to an impact at the time of collision has been described. However, the brake pipes in which the protrusion of each intake pipe is disposed on the dash panel Of course, the present invention can also be applied to a case where a component such as a brake booster or a canister abuts against a component behind the vehicle body by an impact at the time of collision.

  In each of the above-described embodiments, the case where the projections 15 and 23 are provided on the intake pipes 12a and 21a of the intake manifolds 12 and 21 of the four-cylinder internal combustion engine 10 has been described. A protrusion may be provided on a resin intake manifold of an internal combustion engine having a cylinder.

  In each of the above embodiments, one protrusion 15 and 23 is provided at the rear end portion of each intake pipe 12a or at the front end portion of each intake pipe 21a. The protrusion may be provided anywhere as long as it is a portion facing the intake manifold facing the component member, and any number of protrusions may be provided.

  In each of the above embodiments, the case where the internal combustion engine 10 is arranged at the front is described. However, the present invention can also be applied to the case where the internal combustion engine is arranged at the rear, and by the positive destruction of the intake manifold at the time of rear collision (at the time of rear collision). Thus, the length in the longitudinal direction of the vehicle body to be crushed for absorbing the impact force is sufficiently secured, and the crash stroke at the time of the rear impact can be sufficiently secured.

  Further, in each of the above embodiments, the substantially cylindrical projections 15 and 23 are used. However, the present invention is not limited to this, and any shape can be used as long as the intake manifold is easily destroyed by an impact at the time of collision. It may be a protrusion.

It is a fragmentary sectional view of the front part of a car using the intake manifold structure concerning Example 1 of the present invention. It is a perspective view of an intake manifold similarly. It is a fragmentary sectional view of the front part of a car using the intake manifold structure concerning Example 2 of the present invention. It is a perspective view of an intake manifold similarly.

Explanation of symbols

10 Internal combustion engine 12, 21 Intake manifold 15, 23 Projection 12a, 21a Intake pipe (projection mounting portion)
16 Fan shroud (component in front of the car body)
D dash panel (components behind the car body)

Claims (3)

A resin intake manifold is connected to one side surface of the internal combustion engine that is disposed horizontally with respect to the traveling direction of the automobile,
An intake manifold structure characterized in that a portion of the intake manifold remote from the internal combustion engine on one side is provided with a projection that locally transmits an impact at the time of collision to the intake manifold and serves as a starting point of destruction. In the intake manifold structure according to claim 1,
The intake manifold is connected to the rear side surface of the vehicle body with respect to the internal combustion engine, and is destroyed from the mounting portion of the protrusion by abutment of the protrusion on the structural member or the vehicle body behind the intake manifold in the event of a collision. An intake manifold structure featuring In the intake manifold structure according to claim 1,
The intake manifold is connected to a front side surface of the vehicle body with respect to the internal combustion engine, and is destroyed from a mounting portion of the protrusion by abutment of the protrusion with a structural member in front of the vehicle body than the intake manifold at the time of a collision. Intake manifold structure.

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