JP4539441B2 - Intake device for internal combustion engine - Google Patents

Description

  The present invention relates to an intake device for an internal combustion engine that distributes air to each cylinder of the internal combustion engine. More specifically, the present invention can secure sufficient strength against external vibrations and internal pressure fluctuations in a normal use state, The present invention relates to an intake device for an internal combustion engine that can reduce damage to an internal combustion engine main body or a fuel pipe or the like by destroying a predetermined portion and absorbing an impact force at the time of a vehicle collision.

  Conventionally, as an intake device for an internal combustion engine that is placed sideways with respect to the traveling direction of the vehicle and connected to the outer side surface of the internal combustion engine, the intake manifold flange portion near the fuel injection valve has a thick structure, while the other portions are A technique is known in which a thin structure is destroyed and the impact force is absorbed when the vehicle collides, for example (see Patent Document 1).

  As a related prior art, a technique is known in which a fuel pipe protection member is fastened together with a bolt to a flange portion fixed to a cylinder head of an intake manifold (see, for example, Patent Document 2).

  In addition, there is a technology for absorbing the impact by collapsing the cross section of the intake manifold that is horizontal with respect to the vehicle traveling direction in the event of a vehicle collision, and protecting the fuel injection valve by making the intake manifold flange near the fuel injection valve thick. It is known (for example, see Patent Document 3).

  Furthermore, a technique is known in which the base of the intake manifold is formed to be easily deformed or broken at the time of a vehicle collision, and the intake manifold rotates around the base at the time of a collision to absorb the impact (for example, non-patent literature). 1).

JP 2002-174152 A JP 2003-35228 A JP-A-8-246968 Toyota Technical Disclosure Collection 13875

  In order to support the intake manifold from external vibrations or internal pressure fluctuations of the vehicle / internal combustion engine in a normal use state, it is effective to attach a support means such as a stay to the intake device for the internal combustion engine. It is common to install it next to or above the surge tank or intake manifold.

  However, in the conventional intake device for an internal combustion engine according to Patent Document 1, the intake manifold in the vicinity of the fuel pipe has a thick structure and the other portions have a thin structure, so that it is suitable for attaching the support means. The thick structure portion is extremely limited, and it has been difficult to ensure sufficient strength to constitute the support means.

  For this reason, in the event of a vehicle collision, the thin structure portion is destroyed and the impact force is absorbed to protect the fuel piping and the like from damage, but external vibrations and internal pressure fluctuations of the vehicle / internal combustion engine under normal use conditions, etc. It was difficult to secure the strength for attaching the supporting means to suppress.

  The present invention has been made in view of the above, and can secure sufficient strength against external vibration, internal pressure fluctuation, etc. in a normal use state, and a predetermined portion is destroyed and impacted in the event of a vehicle collision. An object of the present invention is to provide an intake device for an internal combustion engine that can reduce damage to the internal combustion engine body or fuel piping by absorbing force.

In order to solve the above-described problems and achieve the object, an internal combustion engine intake device according to claim 1 of the present invention is placed in a lateral direction with respect to a traveling direction of a vehicle and connected to an outer side surface of the internal combustion engine. In the intake apparatus for an internal combustion engine, the intake apparatus for an internal combustion engine includes a central high-strength portion formed at a substantially central portion with higher mechanical strength than a portion other than the central portion, and the central high-strength portion on the internal combustion engine side. A surge tank formed lower in mechanical strength than the central high-strength portion, and provided in communication with the surge tank on the anti-internal combustion engine side of the central high-strength portion, the central high-strength portion An intake manifold having a lower mechanical strength than the upper portion of the central high-strength portion is connected to the internal combustion engine so that an upper end of the intake manifold communicates with a cylinder of the internal combustion engine. The center The lower strength portion via a stay fixed to the internal combustion engine, when the internal combustion engine intake device in the event of a collision of the vehicle receives an impact force to the internal combustion engine side, an intake device for the internal combustion engine The fixing portion by the stay is rotated to the internal combustion engine side while being broken .

Therefore, according to the present invention, sufficient strength is secured by fixing the upper and lower portions of the central high-strength portion to the internal combustion engine against external vibrations and internal pressure fluctuations in a normal use state. Also, in the event of a vehicle collision, the impact is absorbed by mainly destroying the intake manifold and surge tank formed with lower mechanical strength than the central high-strength part, so the internal combustion engine body or fuel piping, etc. Damage to the is reduced.
In addition, when the vehicle collides, the internal combustion engine intake device rotates toward the internal combustion engine while destroying the fixed portion by the stay, thereby ensuring a crash stroke in the rotational direction.

  According to a second aspect of the present invention, there is provided an intake device for an internal combustion engine according to the first aspect of the present invention, wherein the narrow portion formed by narrowing the formation width of the central high strength portion is formed near the upper portion of the central high strength portion. And when the internal combustion engine intake device receives an impact force on the internal combustion engine side during the collision of the vehicle, the internal combustion engine intake device rotates toward the internal combustion engine with the vicinity of the narrow portion as a fulcrum. It is characterized by being able to move.

  Therefore, according to the present invention, when the intake device for an internal combustion engine receives an impact force on the internal combustion engine side in the event of a vehicle collision, stress concentrates in the vicinity of the narrow width portion and the portion is easily deformed. This deformation makes it easier for the internal combustion engine intake device to turn to the internal combustion engine side with the narrow width portion as a fulcrum, thereby increasing the crash stroke in the turning direction.

  According to a third aspect of the present invention, there is provided an intake device for an internal combustion engine according to the second aspect, wherein the overall shape in the vicinity of the upper portion of the central high-strength portion provided with the narrow portion is substantially inverted L-shaped. It is characterized by having a shape.

  Therefore, according to the present invention, when the intake device for the internal combustion engine rotates toward the internal combustion engine with the narrow portion near the fulcrum, it becomes easy to secure a rotational moment, and the crash stroke in the rotational direction is further increased. .

According to the intake device for an internal combustion engine according to the present invention (Claim 1), the upper portion and the lower portion of the central high-strength portion are fixed to the internal combustion engine against external vibrations and internal pressure fluctuations in a normal use state. Therefore, sufficient strength can be secured. Also, in the event of a vehicle collision, the impact is absorbed by mainly destroying the intake manifold and surge tank formed with lower mechanical strength than the central high-strength part, so the internal combustion engine body or fuel piping, etc. Damage to the can be reduced.
In addition, when the vehicle collides, the internal combustion engine intake device rotates toward the internal combustion engine while destroying the fixed portion by the stay, thereby ensuring a crash stroke in the rotational direction.

  Further, according to the intake device for an internal combustion engine according to the present invention (Claim 2), when the internal combustion engine intake device receives an impact force on the internal combustion engine side in the event of a vehicle collision, stress is generated in the vicinity of the narrow portion. Since the portion is easily deformed and the portion is easily deformed, the intake device for the internal combustion engine can be easily turned to the internal combustion engine side around the narrow portion, and the crash stroke in the turning direction can be increased.

  Further, according to the intake device for an internal combustion engine according to the present invention (Claim 3), when the intake device for the internal combustion engine rotates to the internal combustion engine side with the vicinity of the narrow portion as a fulcrum, it becomes easy to secure a rotational moment. The crash stroke in the rotation direction can be further increased.

  Hereinafter, an embodiment of an intake device for an internal combustion engine according to the present invention will be described in detail with reference to the drawings. Although this embodiment shows an example in which the present invention is applied to a four-cylinder internal combustion engine, the present invention is not limited to this embodiment.

  FIG. 1 is a partial sectional view showing an intake device for an internal combustion engine according to an embodiment of the present invention, and is a sectional view cut at a position AA shown in FIG. 3 to be described later. FIG. 2 is a side view showing an intake device for an internal combustion engine attached to the internal combustion engine, and FIG. 3 is a front view showing the intake device for the internal combustion engine. 4 is an explanatory view showing a direction in which the intake device for an internal combustion engine rotates when receiving an impact force F, and FIG. 5 is a central high-strength portion cut at a BB position shown in FIG. FIG.

  As shown in FIG. 2, the intake device 10 for an internal combustion engine is placed horizontally with respect to the traveling direction of the vehicle and is connected to the outer side surface 20 a of the internal combustion engine 20. In addition, the code | symbol 23 in FIG. 2 has shown the head cover.

  Further, as shown in FIGS. 1 to 5, the intake device 10 for an internal combustion engine includes a central high-strength portion 12 formed at a substantially central portion with higher mechanical strength than a portion other than the central portion, A surge tank 13 provided on the internal high-pressure portion 12 side of the central high-strength portion 12 and having a mechanical strength lower than that of the central high-strength portion 12, and a surge tank 13 on the anti-internal combustion engine 20 side of the central high-strength portion 12 The intake manifold 14 is provided integrally with the intake manifold 14 which is provided so as to be lower in mechanical strength than the central high-strength portion 12.

  The central high-strength portion 12, the surge tank 13, and the intake manifold 14 can be integrally formed of a thermoplastic hard resin (for example, a polyamide resin). The central high-strength portion 12 is formed thicker than the thickness of the surge tank 13 and the intake manifold 14, and is formed between the outer periphery of the surge tank 13 and the intake manifold 14 and each intake manifold 14. Thereby, the center high intensity | strength part 12 has fulfill | performed the function as a reinforcement rib of the intake device 10 for internal combustion engines.

  The upper end of the intake manifold 14 is connected to the upper portion of the central high-strength portion 12 formed as a flange 16 so as to communicate with a cylinder (not shown) of the internal combustion engine 20, and the flange 16 is connected to the cylinder head 21. And a bolt 17.

  Further, a fuel pipe protection portion 16a is provided on the upper portion of the flange 16 by extending it further upward. The fuel pipe protection unit 16a protects the injector 25 disposed in the cylinder head 21 and the fuel pipe 26 that supplies fuel to the injector 25 from the intake manifold 14 and the like that are deformed and destroyed in the event of a vehicle collision. It is provided to do.

  On the other hand, the lower portion of the central high-strength portion 12 is fixed to the internal combustion engine 20 with a bolt 32 via an L-shaped bracket stay 30. That is, the stay 30 is firmly fixed over the lower portion of the central high strength portion 12 formed as a thick portion and the internal combustion engine 20, and the upper portion of the central high strength portion 12 is also connected to the cylinder head 21 by the flange 16. Since it is fixed, the intake device 10 for an internal combustion engine is sufficiently protected from external vibrations and internal pressure fluctuations in a normal use state.

  Further, near the upper portion of the central high-strength portion 12, a narrow width portion 12a having a narrower formation width is provided. The overall shape near the upper portion of the central high-strength portion 12 provided with the narrow width portion 12a is formed in a substantially inverted L shape.

  By forming the central high-strength portion 12 in this way, as shown in FIG. 4, the internal combustion engine intake device 10 receives an impact force F (see the white arrow) on the internal combustion engine 20 side in the event of a vehicle collision. And stress concentrates on the weak part 14a which is a part of the intake manifold 14 near the narrow part 12a, and the weak part 14a is easily deformed.

  Due to the deformation of the narrow width portion 12a, the intake device 10 for the internal combustion engine is easily rotated toward the internal combustion engine 20 with the vicinity of the narrow width portion 12a as a fulcrum, as indicated by a solid arrow in FIG. The crash stroke in the direction of movement increases.

  In addition, since the overall shape near the upper portion of the central high-strength portion 12 is formed in a substantially inverted L shape, it is easy to secure a rotational moment, and the crash stroke in the rotational direction can be increased.

  As shown in FIG. 3, a throttle body 35 for connecting a throttle valve (not shown) is connected to the lower portion of the side surface of the central high-strength portion 12. A bolt hole 18 formed in the flange 16 is for inserting the bolt 17. Further, the through hole 19 is used to lighten the central high-strength portion 12 and reduce the weight of the intake device 10 for the internal combustion engine.

  Next, operations and effects achieved by the intake device 10 for an internal combustion engine configured as described above will be described with reference to FIGS. 1 and 4.

  As shown in FIG. 1, the central high-strength portion 12 formed as a thick portion is fixed at its upper portion to the cylinder head 21 by a flange 16 and its lower portion is firmly fixed to the internal combustion engine 20 via a stay 30. Therefore, the intake device 10 for an internal combustion engine is sufficiently protected from external vibrations and internal pressure fluctuations in a normal use state.

  Further, as shown in FIG. 4, when the internal combustion engine intake device 10 receives an impact force F (see the white arrow) on the internal combustion engine 20 side in the event of a vehicle collision, it is thinner than the central high-strength portion 12. Since the intake manifold 14 is crushed, the shock is absorbed.

  Further, the vicinity of the flange 16 of the central high-strength portion 12 is formed thick and has high strength, so that it is difficult to be deformed and destroyed, and the injector 25 and the fuel pipe 26 are not easily destroyed.

  Even if the intake manifold 14 or the like is deformed or destroyed, the injector 25 and the fuel pipe 26 are protected to some extent by the fuel pipe protection portion 16a, so that it is possible to suppress the occurrence of fuel leakage or the like.

  When the internal combustion engine intake device 10 further receives an impact force F, stress concentrates on the fragile portion 14a and the fragile portion 14a is deformed, and the fixing portion by the stay 30 is broken and the vicinity of the narrow width portion 12a. Is rotated in the direction of the black arrow in FIG. The impact is absorbed even in the process of the deformation of the fragile portion 14a and the destruction of the stay 30.

  When the internal combustion engine intake device 10 continues to rotate as it is, the surge tank 13 formed thinner than the central high-strength portion 12 is crushed while colliding with the internal combustion engine 20, so that the shock is absorbed even in this process. .

  In this way, in the event of a vehicle collision, the internal combustion engine intake device 10 rotates toward the internal combustion engine 20 to increase the crash stroke, and the intake manifold 14 and surge tank 13 are crushed during the rotation process. Absorbs shock. Therefore, damage to the internal combustion engine 20 or the fuel pipe 26 can be reduced.

  In the above-described embodiment, the narrow width portion 12a is provided near the upper portion of the central high-strength portion 12. However, the present invention is not limited to this, and as shown in FIG. The central high-strength portion 12 that is not provided may be formed.

  In this case, compared to the case of the above-described embodiment in which the narrow width portion 12a is provided, the vicinity of the upper portion of the central high-strength portion 12 is less likely to be deformed, but the stay 30 portion is considered to be more easily broken than that portion. Therefore, the crash stroke by the rotation to the internal combustion engine 20 side is ensured. Here, FIG. 6 is a side view showing another internal combustion engine intake device 10.

  As described above, the intake device for an internal combustion engine according to the present invention is useful for an automobile equipped with an internal combustion engine, and particularly secures sufficient strength against external vibration, internal pressure fluctuation, and the like in a normal use state. At the same time, it is suitable for an intake device for an internal combustion engine that aims to reduce damage to the internal combustion engine main body or fuel piping by absorbing a shock force by destroying a predetermined portion at the time of a vehicle collision.

1 is a partial sectional view showing an intake device for an internal combustion engine according to an embodiment of the present invention. It is a side view which shows the intake device for internal combustion engines attached to the internal combustion engine. It is a front view which shows the intake device for internal combustion engines. FIG. 3 is an explanatory diagram showing a direction in which an intake device for an internal combustion engine rotates when receiving an impact force F. It is sectional drawing which shows the center high intensity | strength part cut | disconnected in the BB position shown in FIG. It is a side view which shows the other intake device for internal combustion engines.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Intake device for internal combustion engines 12 Central high intensity | strength part 12a Narrow width part 13 Surge tank 14 Intake manifold 16 Flange 20 Internal combustion engine 20a Outer side surface 21 Cylinder head 25 Injector 26 Fuel piping 30 Stay

Claims (3)

In an intake device for an internal combustion engine that is placed horizontally with respect to the traveling direction of the vehicle and connected to the outer side surface of the internal combustion engine,
The intake device for an internal combustion engine has a central high-strength portion formed at a substantially central portion with higher mechanical strength than a portion other than the central portion,
A surge tank that is provided on the internal combustion engine side of the central high-strength portion, and has a lower mechanical strength than the central high-strength portion;
An intake manifold provided in communication with the surge tank on the side opposite to the internal combustion engine of the central high-strength portion, and having a lower mechanical strength than the central high-strength portion;
With integrated,
The upper portion of the central high strength portion is connected to the internal combustion engine so that the upper end of the intake manifold communicates with the cylinder of the internal combustion engine, and the lower portion of the central high strength portion is fixed to the internal combustion engine via a stay , When the internal combustion engine intake device receives an impact force on the internal combustion engine side in the event of a collision of the vehicle, the internal combustion engine intake device rotates toward the internal combustion engine side while destroying the fixing portion by the stay An intake device for an internal combustion engine, characterized in that:   In the vicinity of the upper portion of the central high-strength portion, a narrow width portion is formed by narrowing the formation width of the central high-strength portion, and the internal combustion engine intake device receives an impact force on the internal combustion engine side at the time of the vehicle collision 2. The intake device for an internal combustion engine according to claim 1, wherein the intake device for the internal combustion engine rotates toward the internal combustion engine with the vicinity of the narrow portion as a fulcrum.   The intake device for an internal combustion engine according to claim 2, wherein an overall shape near an upper portion of the central high-strength portion provided with the narrow width portion is substantially inverted L-shaped.

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