JP2013249815A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake manifold to enable effective absorbtion of shock at collision of the automobile.SOLUTION: In a second divided body 22 of an intake manifold 10, a pipe wall of an intake introduction pipe 11 and a pipe wall of a fourth branch pipe 16 are formed integrally with a common wall 31. A boundary flange 33 is provided at a boundary part of a throttle valve 8 side part in the fourth branch pipe 16 and the common wall 31 while extending toward the radial direction outer side in a state covering a part of the right sidewall of the fourth branch pipe 16. The boundary flange 33 is provide with as a vulnerable part an arc-like slit 35 on the inside along the inner circumference of the intake introduction pipe 11. Also a plurality of straight slits 36 are provided continuously from the outer circumferential surface to the right side surface along the axial direction of the intake introduction pipe 11.

Description

  The present invention relates to an intake manifold attached to an engine of an automobile, and more particularly, to a technique for performing effective shock absorption at the time of a collision.

  In a multi-cylinder engine for automobiles, an intake manifold is generally fastened to a side wall surface of an intake port in a cylinder head, and fresh air (air or air-fuel mixture) is generally supplied to a combustion chamber of each cylinder through the intake manifold. . The intake manifold has an intake pipe for introducing fresh air that has passed through the air cleaner and the throttle body, an intake chamber for temporarily storing fresh air introduced from the intake pipe, and fresh air in the intake chamber. Some of them are composed of branch pipes that distribute to the intake ports of each cylinder. As a method of manufacturing the intake manifold, die-cast molding made of aluminum alloy is sometimes used, but in recent years, injection-molded products made of resin have emerged in order to reduce weight and cost. Yes.

When installing a plastic intake manifold on the front of an engine that is arranged at right angles to the direction of travel of the automobile, there is a technology to absorb impact force at the time of collision by providing a weakened portion extending in the axial direction on the intake manifold It has been proposed (see Patent Document 1). According to the configuration of Patent Document 1, when an automobile collides with another vehicle or a structure on the road, the intake manifold is destroyed along the fragile portion so that the impact force is absorbed and the horizontal sectional shape is crushed. (It is crushed so as to be flattened back and forth), thereby reducing the occupied volume of the intake manifold and increasing the crash stroke.
Japanese Patent No. 2699915

  The present inventors include an intake pipe to which a throttle valve is attached, an intake chamber for storing intake air from the intake pipe, and a branch pipe for supplying intake air from the intake chamber to the intake port of the engine. An intake manifold has been developed in which a branch pipe is integrally formed on the outer periphery of the intake pipe. However, in the case of this intake manifold, the strength and rigidity of the joint portion between the intake introduction pipe and the branch pipe become very high, and it has been found that the method of Patent Document 1 cannot sufficiently absorb the impact at the time of collision. That is, the part where the throttle valve is attached to the intake pipe at the time of a collision is not separated from the branch pipe or the intake chamber (the intake pipe does not break at a suitable part), and the smooth retreat of the engine is inhibited. This prevents effective shock absorption.

  The present invention has been made in view of such a background, and an object of the present invention is to provide an intake manifold in which effective shock absorption is performed at the time of a car collision.

  In a first aspect of the present invention, a resin intake manifold (10) attached to a multi-cylinder engine (1), the intake intake pipe (11) for introducing intake air from a throttle valve (8). ), An intake chamber (12) for storing intake air introduced from the intake introduction pipe, and a part thereof extends along the outer periphery of the intake introduction pipe, and the intake air in the intake chamber is transferred to the engine A plurality of branch pipes (13 to 16) respectively supplied to the intake ports, and the inner pipe wall of the branch pipe (16) extending along the outer periphery of the intake inlet pipe, A part of the pipe wall of the intake pipe is integrally formed with a shared wall (31), and a fragile part (35, 36) is formed at a boundary portion between the throttle valve side part of the intake pipe and the shared wall. Provided.

  In the second aspect of the present invention, the weakened portion is an arcuate or annular slit (35) formed along the inner periphery of the boundary portion in the intake air introduction pipe.

  In the third aspect of the present invention, the fragile portion includes a plurality of linear slits (36) formed along the axial direction of the intake pipe at the outer periphery of the boundary portion of the branch pipe or the intake pipe. It is.

  According to the present invention, the fragile portion breaks at the time of a collision, so that the portion where the throttle valve is attached in the intake air intake pipe is separated from the branch pipe and the intake chamber, and the impact is effectively reduced by the engine retreating smoothly. Absorption is realized.

It is a perspective view of the engine for vehicles concerning an embodiment. It is a disassembled perspective view of the intake system component which concerns on embodiment. It is a principal part front view of the intake manifold which concerns on embodiment. It is a principal part perspective view of the intake manifold which concerns on embodiment. It is VV expanded sectional drawing in FIG.

  Hereinafter, an embodiment in which the present invention is applied to an intake manifold of an in-line four-cylinder engine for automobiles (hereinafter simply referred to as an engine) will be described in detail with reference to the drawings. In the description of each part in the intake manifold, for the sake of convenience, up, down, left and right, front and back are indicated by arrows in FIG. 1, and the position and direction are indicated along these.

<< Configuration of Embodiment >>
As shown in FIGS. 1 and 2, the engine 1 of this embodiment includes a cylinder head 2 fastened to the upper surface of a cylinder block (not shown), a head cover 3 fastened to the upper surface of the cylinder head 2, and the like. The intake flange 2a formed on the intake side (front surface) of the cylinder head 2 has four intake ports 5a to 5d opened side by side in the left-right direction and an EGR gas supply hole to the right of the intake port 5d on the right end side. 6 is open. An EGR block 7 is fastened to the cylinder head 2 so as to cover the EGR gas supply hole 6, and EGR gas from the EGR gas supply hole 6 is supplied into an intake air introduction pipe 11 to be described later via the EGR block 7. .

<Intake manifold>
As shown in FIG. 1 and FIG. 2, the intake manifold 10 is fastened to the intake flange 2a of the cylinder head 2 and the front surface of the EGR block 7 (see FIG. 2), and from the throttle valve 8 fastened to the right end. An intake air introduction pipe 11 into which air (intake air) flows, an intake chamber 12 into which fresh air flows from the intake air introduction pipe 11, and fresh air in the intake chamber 12 are respectively guided to the intake ports 5 a to 5 d of the engine 1. 1 to 4th branch pipes 13 to 16.

  The intake intake pipe 11 extends from the right side (upstream side) to the center of the intake manifold 10 and then bends upward in a substantially L shape, and the downstream end is connected to the front surface of the intake chamber 12. The intake chamber 12 is located at the top of the intake manifold 10 and has a chamber chamber (not shown) inside. The first to fourth branch pipes 13 to 16 have an upstream end connected to the front portion of the intake chamber 12, and after bending in a substantially arc shape toward the front, the downstream end has a fastening flange (not shown). And is fastened to the intake flange 2a of the cylinder head 2. The third and fourth branch pipes 15 and 16 are partially wound around the outer periphery of the intake air introduction pipe 11, and at least the lower part thereof is integrated with the intake air introduction pipe 11.

  The intake manifold 10 includes first and second divided bodies 21 and 22 that are thermoplastic resin injection-molded products, and is manufactured by joining the divided bodies 21 and 22 to each other by vibration welding. The first divided body 21 constitutes an intake chamber 12 and a rear portion of the intake introduction pipe 11 and the first to fourth branch pipes 13 to 16. Further, the second divided body 22 forms a front portion of the intake air introduction pipe 11 and the first to fourth branch pipes 13 to 16.

  As shown in FIG. 5, in the second divided body 22 of the intake manifold 10, the pipe wall of the intake pipe 11 and the pipe wall of the fourth branch pipe 16 are integrally formed with a common wall 31. As shown in FIGS. 3 to 5, the boundary portion between the portion on the throttle valve 8 side of the fourth branch pipe 16 and the common wall 31 covers a part of the right side wall of the fourth branch pipe 16. A boundary flange 33 that expands radially outward is provided.

  As shown in FIGS. 3 to 5, the boundary flange 33 is provided with an arc-shaped slit 35 inside the intake flange 11 as a fragile portion along the inner circumference of the intake manifold 11, and the axial direction of the intake manifold 11. A plurality of (seven in the illustrated example) linear slits 36 are provided so as to be continuous from the outer peripheral surface to the right side surface.

<< Operation of Embodiment >>
When the engine 1 starts operation, new air is sucked from the air cleaner with negative pressure along with the reciprocating motion of the piston, and this new air flows into the intake manifold 10 via the throttle valve 8. The fresh air flowing into the intake manifold 10 is introduced into the intake chamber 12 from the intake introduction pipe 11, and then supplied to the intake ports 5a to 5d of the cylinder head 2 via the first to fourth branch pipes 13 to 16, When the intake valve is opened, it is supplied to the combustion chamber.

  On the other hand, an automobile may collide with another vehicle or a structure on the road from the front, and the engine 1 may retreat in the engine room. At this time, a boundary flange 33 is formed between the intake inlet pipe 11 and the fourth branch pipe 16 in the intake manifold 10, and an arcuate slit 35 and a linear slit 36 are provided inside and outside the boundary flange 33 as weak parts. Therefore, the intake pipe 11 is easily broken at the boundary flange 33 by an impact. As a result, the throttle valve 8 is separated from the intake manifold 10 (that is, the engine 1), and the impact is effectively absorbed by the engine 1 moving backward smoothly. In addition, since the rear part (the 1st division body 21 side) in the intake pipe 11 is comparatively thin, it is easily broken when the boundary flange 33 is broken.

  This is the end of the description of specific embodiments. However, aspects of the present invention are not limited to these embodiments. For example, in the above-described embodiment, the present invention is applied to an intake manifold of an in-line four-cylinder engine for automobiles. However, the present invention is applied to an in-line six-cylinder engine, a V-type six-cylinder engine, etc. Naturally, this can be applied to other intake manifolds. In the above embodiment, a part of the third and fourth branch pipes are wound around the outer periphery of the intake pipe, but the straight pipe branch pipe and the intake pipe are in contact with each other at a predetermined angle. It is good. In the above embodiment, the boundary flange is formed at the boundary portion between the intake inlet pipe and the common wall. For example, a circumferential slit is formed at the inner periphery or the outer periphery of the intake inlet tube at the boundary portion. May be. In addition, the specific structure and shape of the intake manifold and each divided body can be set as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder head 5a-5d Intake port 8 Throttle valve 10 Intake manifold 11 Intake introduction pipe 12 Intake chamber 16 4th branch pipe 31 Common wall 33 Boundary flange 35 Arc-shaped slit (fragile part)
36 Straight slit (fragile part)

Claims (3)

A resin-made intake manifold attached to a multi-cylinder engine,
An intake pipe for introducing intake air from the throttle valve;
An intake chamber for storing intake air introduced from the intake introduction pipe;
A part of which extends along the outer periphery of the intake pipe, and includes a plurality of branch pipes for supplying the intake air in the intake chamber to the intake ports of the engine,
An inner tube wall of the branch pipe that extends along the outer periphery of the intake introduction pipe and a part of the pipe wall of the intake introduction pipe are integrally formed with a common wall,
An intake manifold, wherein a weak portion is provided at a boundary portion between the throttle valve side portion of the intake pipe and the common wall.   2. The intake manifold according to claim 1, wherein the fragile portion is an arcuate or annular slit formed along an inner periphery of the boundary portion of the intake introduction pipe.   The fragile portion is a plurality of linear slits formed along the axial direction of the intake pipe on the outer periphery of the boundary portion in the branch pipe or the intake pipe. The intake manifold according to claim 2.

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