JP7234782B2 - Intake manifold for automotive internal combustion engine - Google Patents

Description

The present invention relates to an intake manifold for a vehicle internal combustion engine.

Patent Literature 1 discloses an intake manifold for a vehicle-mounted internal combustion engine, which includes a surge tank and a plurality of branch pipes branching and extending from the surge tank and connected to an intake port of a cylinder head.

The branch pipe of the intake hold described in Document 1 includes a main body extending from a surge tank and a terminal pipe welded to the downstream end of the main body. A flange projecting outward is provided at the downstream end of the terminal pipe. The intake manifold is fastened to the cylinder head via a flange.

JP 2018-189011 A

By the way, in a conventional intake manifold, when an external force acts on the branch pipe due to a vehicle collision, stress concentration tends to occur at the boundary portion between the flange and the portion of the branch pipe upstream of the flange. Therefore, problems such as deformation of the branch pipe may occur starting from the boundary portion.

SUMMARY OF THE INVENTION An object of the present invention is to provide an intake manifold for a vehicle-mounted internal combustion engine that can suppress stress concentration on a boundary portion between a flange and a portion of a branch pipe upstream of the flange.

An intake manifold for a vehicle-mounted internal combustion engine for achieving the above object includes a surge tank and a plurality of branch pipes branching and extending from the surge tank. and downstream side, the downstream end of the branch pipe is provided with a flange protruding to the outer peripheral side, and the branch pipe is provided with a flange that extends from the outer peripheral surface of the flange from the flange of the branch pipe. A rib is provided that continuously extends to the outer peripheral surface of the upstream portion.

According to this configuration, the ribs provided on the branch pipe continuously extend from the outer peripheral surface of the flange to the outer peripheral surface of the portion of the branch pipe on the upstream side of the flange. When an external force acts on the branch pipe, the external force is easily transmitted to the flange via the rib. Therefore, the external force acting on the boundary portion between the flange and the portion of the branch pipe upstream of the flange is reduced. Therefore, stress concentration at the boundary portion can be suppressed.

According to the present invention, it is possible to suppress stress concentration at the boundary portion between the flange and the portion of the branch pipe upstream of the flange.

1 is a perspective view showing an intake manifold of one embodiment; FIG. The perspective view which shows the rear end of the flange of the same embodiment. The perspective view which shows the front end of the flange of the same embodiment. The perspective view of the branch pipe which shows the 1st rib of a modification.

An embodiment will be described below with reference to FIGS. 1 to 3. FIG.
As shown in FIG. 1, an intake manifold 10 of the present embodiment is applied to a horizontally opposed four-cylinder vehicle-mounted internal combustion engine, and is made of a heat-resistant resin material.

The intake manifold 10 includes a surge tank 20 having an intake inlet 21 for introducing intake air, and a plurality of (four in this embodiment) branch pipes 30 branching and extending from the surge tank 20 .

Hereinafter, the vehicle width direction will be referred to as the vehicle width direction X, and the front-rear direction of the vehicle will be referred to as the front-rear direction Y. Also, the upstream side and the downstream side in the intake air flow direction are simply referred to as the upstream side and the downstream side.
The intake manifold 10 is mounted on the vehicle in such a posture that the intake inlet 21 of the surge tank 20 opens toward the rear side in the front-rear direction Y. As shown in FIG.

An intake port 21 of the surge tank 20 is connected to a throttle body (not shown). As a result, intake air is supplied into the surge tank 20 through the intake inlet 21 and branched to each branch pipe 30 .

The branch pipes 30 extend two by two from both sides of the surge tank 20 in the vehicle width direction X and are connected to intake ports (not shown) of the cylinder head 100 . The two branch pipes 30 on both sides in the vehicle width direction X are spaced apart from each other in the front-rear direction Y. As shown in FIG.

Each branch pipe 30 has an introduction portion 31 into which intake air from the surge tank 20 is introduced, and a connecting portion 33 connected to the downstream end of the introduction portion 31 and fixed to the cylinder head 100 .
An annular welded portion 32 projecting outward is formed at the downstream end of each introduction portion 31 . Each introduction portion 31 and each connection portion 33 are connected by welding at each welding portion 32 .

A common flange 34 protruding to the outer peripheral side is provided at the downstream end of the two connecting portions 33 on both sides in the vehicle width direction X. As shown in FIG.
As shown in FIGS. 1 to 3, the front and rear ends of each flange 34 are formed with insertion holes 34a through which bolts 90 (see FIGS. 2 and 3) are inserted. Insertion holes 34b through which the bolts 90 are inserted are formed in the outer sides of the flanges 34 in the vehicle width direction X and between the connecting portions 33 in the front-rear direction Y. As shown in FIG. In FIG. 1, illustration of each bolt 90 is omitted.

The intake manifold 10 is fixed to the cylinder head 100 by screwing the bolts 90 inserted through the insertion holes 34 a into the cylinder head 100 .
As shown in FIGS. 2 and 3, on the outer peripheral surface of each connecting portion 33, a plurality of lateral ribs 35 protruding to the outer peripheral side so as to surround the outer peripheral surface are spaced apart from each other in the extending direction of the connecting portion 33. formed by

A plurality of vertical ribs 36 extending along the extension direction are formed on the outer peripheral surface of each connecting portion 33 at intervals. The vertical ribs 36 of the connecting portion 33 on the rear side in the longitudinal direction Y are formed on both sides in the vehicle width direction X and on the rear side in the longitudinal direction Y on the outer peripheral surface of the connecting portion 33 . The longitudinal ribs 36 of the connecting portion 33 on the front side in the longitudinal direction Y are formed on both sides in the vehicle width direction X and on the front side in the longitudinal direction Y of the outer peripheral surface of the connecting portion 33 .

The two longitudinal ribs 36 positioned on the rear side in the front-rear direction Y and the two longitudinal ribs 36 positioned on the front side in the front-rear direction Y of the branch pipe 30 continuously extend to the outer peripheral surface of the flange 34 . In other words, the vertical rib 36 continuously extends from the outer peripheral surface of the flange 34 to the outer peripheral surface of the connecting portion 33 on the upstream side of the flange 34 in the branch pipe 30 . A portion of the vertical rib 36 formed on the outer peripheral surface of the flange 34 extends over the entire thickness of the flange 34 .

Hereinafter, among the vertical ribs 36, those that extend continuously from the outer peripheral surface of the connecting portion 33 to the outer peripheral surface of the flange 34 are referred to as first ribs 36a, and extend only to the outer peripheral surface of the connecting portion 33. The ribs 36b are called second ribs 36b. Note that the first rib 36a corresponds to the rib according to the present invention.

Each first rib 36a located on the rear side in the front-rear direction Y is provided at a position closer to the insertion hole 34a located on the rear side in the front-rear direction Y than each second rib 36b. Further, each first rib 36a located on the front side in the front-rear direction Y is provided at a position closer to the insertion hole 34a located on the front side in the front-rear direction Y than each second rib 36b.

The operation of this embodiment will be described.
As shown in FIGS. 2 and 3, since each first rib 36a extends continuously from the outer peripheral surface of the flange 34 to the outer peripheral surface of the connecting portion 33, each branch pipe 30 may be damaged in the event of a vehicle collision. When an external force acts, the external force is easily transmitted to each flange 34 via each first rib 36a. Therefore, the external force acting on the boundary portion between each flange 34 and the portion of each branch pipe 30 upstream of the flange 34 is reduced.

Effects of the present embodiment will be described.
(1) A flange 34 projecting outward is provided at the downstream end of each branch pipe 30 . A first rib 36a is provided that continuously extends to the outer peripheral surface of the upstream portion.

According to such a configuration, since the above-described effect is achieved, stress concentration at the boundary portion between each flange 34 and the portion of each branch pipe 30 upstream of the flange 34 can be suppressed.

(2) Each first rib 36 a is provided at the front end and the rear end of each flange 34 .
According to such a configuration, when an external force acts on each branch pipe 30 from the front or rear in the longitudinal direction Y due to a frontal collision or a rearward collision of the vehicle, the external force acts on the flange 34 via each first rib 36a. It becomes easy to transmit, and the stress concentration in the said boundary part can be suppressed.

(3) Two branch pipes 30 are spaced apart in the front-rear direction Y, and each of the branch pipes 30 has a common flange 34 .
In a configuration in which a plurality of branch pipes 30 are arranged at intervals in the front-rear direction Y, when a flange is independently provided for each branch pipe 30, the first ribs 36a are provided at the front and rear ends of each of the flanges. must be provided.

In this regard, according to the above configuration, since it is sufficient to provide the first ribs 36a at the front end and the rear end of the common flange 34, the stress concentration at the boundary portion can be suppressed, and the weight associated with the addition of the first ribs 36a can be reduced. It is possible to suppress the increase, etc.

Further, according to the above configuration, since the downstream ends of the two branch pipes 30 are connected to the common flange 34, the overall rigidity of each branch pipe 30 and each flange 34 can be increased.
(4) Insertion holes 34a through which the bolts 90 are inserted are formed at the front and rear ends of each flange 34 .

Since the tightening force of the bolts 90 acts strongly on the portion of each flange 34 near the insertion hole 34a, it is less likely to be deformed by an external force than the portion distant from the insertion hole 34a.
According to the above configuration, each first rib 36a is provided at a position close to each insertion hole 34a. is easily transmitted to the vicinity of Therefore, stress concentration at the boundary portion can be further suppressed.

This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- As shown in FIG. 4, a first rib 136a may be formed on the outer side of each flange 34 in the vehicle width direction X instead of the first rib 36a of the present embodiment. In this case, the external force acting on the boundary portion between each flange 34 and the portion of each branch pipe 30 on the upstream side of the flange 34 is reduced in response to a collision from the side of the vehicle. Therefore, stress concentration at the boundary portion can be suppressed. Further, the first rib 136a may be formed in addition to the first rib 36a of the present embodiment.

- Although the flange 34 of this embodiment was provided in common by the two connection parts 33, a flange may be provided for every branch pipe 30. FIG.
- The first rib 36a may be provided only at the front end of the flange 34 or only at the rear end.

- The number, shape, and position of the first ribs 36a and the second ribs 36b can be changed as appropriate.
- The portion of the first rib 36a formed on the outer peripheral surface of the flange 34 may extend halfway in the thickness direction of the flange 34 .

- The present invention can also be applied to an intake manifold having a branch pipe in which the introduction portion 31 and the connection portion 33 are integrally formed.
- The present invention can also be applied to an intake manifold mounted on a vehicle so that the direction in which a plurality of branch pipes are aligned is aligned with the vehicle width direction X. In this case, the first rib 36a may be provided on at least one side in the vehicle width direction X. As shown in FIG.

- The present invention can also be applied to intake manifolds of V-type internal combustion engines and in-line internal combustion engines.

DESCRIPTION OF SYMBOLS 10... Intake manifold, 20... Surge tank, 21... Intake inlet, 30... Branch pipe, 31... Introduction part, 32... Welding part, 33... Connection part, 34... Flange, 34a, 34b... Insertion hole, 35... Side Rib 36... Vertical rib 36a, 136a... First rib 36b... Second rib 90... Bolt 100... Cylinder head.

Claims (4)

An intake manifold for a vehicle-mounted internal combustion engine comprising a surge tank and a plurality of branch pipes branching and extending from the surge tank,
When the front-rear direction of the vehicle is defined as the front-rear direction, and the upstream side and the downstream side in the intake flow direction are defined as the upstream side and the downstream side,
The plurality of branch pipes are arranged at intervals in the front-rear direction,
Each of the downstream ends of the branch pipes is provided with a common flange protruding to the outer peripheral side,
The branch pipe is provided with a rib that continuously extends from the outer peripheral surface of the flange to the outer peripheral surface of a portion of the branch pipe upstream of the flange,
The rib is provided on at least one of a front end and a rear end of the flange,
Intake manifold for automotive internal combustion engines. An insertion hole through which a bolt is inserted is formed at a front end or a rear end of the flange provided with the rib,
An intake manifold for a vehicle-mounted internal combustion engine according to claim 1. The rib is provided only on at least one of a front end and a rear end of the flange,
3. An intake manifold for a vehicle-mounted internal combustion engine according to claim 1 or 2. It is applied to a horizontally opposed type internal combustion engine,
The plurality of branch pipes are
a plurality of first branch pipes branching and extending from one side of the surge tank in the vehicle width direction and arranged at intervals in the front-rear direction;
a plurality of second branch pipes branching and extending from the side opposite to the one side in the vehicle width direction of the surge tank and arranged at intervals in the front-rear direction;
Each of the first branch pipes has a first flange as the flange,
Each of the second branch pipes has a second flange as the flange,
An intake manifold for a vehicle-mounted internal combustion engine according to any one of claims 1 to 3.

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