JP2578156Y2 - Aluminum intake manifold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an intake manifold made of cast aluminum, which is intended to reduce the thickness and improve the rigidity.

FIG. 4 shows a plan view of an intake manifold.
5 is a view taken along line VV in FIG. 4, and FIG. 6 is a view taken along VI-V in FIG.
The view from line VI is shown. Intake manifold 1
This is a branch pipe that branches and sends a mixture of fuel and air to each cylinder of the engine. One end of the intake manifold 1 is provided with a flange 3 attached to the engine side, and the other end of the intake manifold 1 is provided with a flange 4 attached to the mixture supply side.

[0003] With the reduction in the weight of engines, the intake manifold 1 is also made of aluminum casting. FIG.
As shown in the figure, from the viewpoint of the runnability of the molten aluminum into the mold and the rigidity of the intake manifold 1, the thickness S
Is 3-4 mm.

[0004]

[Problems to be Solved by the Invention] In order to further reduce the weight of the intake manifold 1 made of aluminum casting, the thickness S is set to 1
It is considered that the thickness is reduced to about 2 mm. But,
If the thickness S is cast to a thickness of about 1 to 2 mm using an aluminum melt, it is difficult to produce a product having a uniform thickness due to deterioration of the molten metal in the mold. Further, when the thickness S is reduced, the rigidity is reduced and the strength becomes insufficient.

[0005]

Means for Solving the Problems The configuration of the present invention for solving the above problems, an intake pipe of the first rib along the suction axis
It is provided on the outer wall of, characterized in that the second rib parallel to the parting direction of the casting mold intersects the said first rib is provided on the outer wall of the intake pipe.

[0006]

During casting, the flow of the molten aluminum is promoted by the molten metal path of the first and second ribs, and the first and second ribs serve as reinforcing materials in the product.

[0007]

1 is a side view of an intake manifold made of an aluminum casting according to an embodiment of the present invention, and FIG.
-Viewed from the direction of the arrow II.

[0008] The intake manifold 11 (intake pipe) is made of aluminum casting. Intake manifold 1
One end has a flange 12 attached to the engine side, and the other end of the intake manifold 11 has a flange 13 attached to the mixture supply side.

A first rib 21 is provided on the outer wall of the intake manifold 11 between the flanges 12 and 13 along the suction axis (length direction). A second rib 22 is provided on the outer wall of the intake manifold 11 so as to intersect the first rib 21 and cross the suction axis, that is, a direction parallel to the casting mold splitting direction (the arrow direction in FIG. 1). Have been. The height H of the first rib 21 and the second rib 22 is 5 to 10 mm,
The other portions have a thickness h of 1 to 2 mm.

[0010] Intake manifold 1 based on FIG.
The casting method 1 will be described. FIG. 3 shows a casting situation.

The mold 31 has a first rib 21 (second rib 2).
A recess 31a for forming 2) is provided.
The molten metal passage between them is wide. At the time of casting, the flow of the molten aluminum is promoted by the concave portions 31a, and the molten aluminum sufficiently flows to portions other than the first ribs 21 and the second ribs 22, and defects in the thickness h portion are eliminated.

Intake manifold 11 for cast products
Since the aluminum melt flows sufficiently despite the wall thickness h being as thin as 1 to 2 mm, poor rigidity does not occur. Further, the first rib 21 and the second rib 22 function as a reinforcing material, and the rigidity is improved. Therefore, the intake manifold 11
Can be made thinner.

The above-mentioned intake manifold 11
Since the first rib 21 is provided along the suction axis and the second rib 22 is provided in parallel with the mold splitting direction of the casting mold, the molten aluminum flows through the first rib 21 and the second rib 22 during casting to improve the molten metal run. In addition, the thickness can be reduced and the rigidity can be improved. Also, since the second ribs 22 are parallel to the mold splitting direction of the casting mold, mold flow can be prevented.

[0014]

[Effect of the Invention] The intake manifold made of aluminum casting according to the present invention has a first rib extending along the suction axis and a first rib intersecting the first rib.
Outside the parting direction parallel to the second rib insert casting mold inlet pipe
Since it is provided on the wall, it is possible to achieve both improvement of the molten metal run and improvement of rigidity, and it is possible to reduce the thickness by a normal casting method (gravity, low pressure). As a result, the weight of the intake manifold can be reduced without lowering the rigidity.

[Brief description of the drawings]

FIG. 1 is a side view of an intake manifold made of aluminum casting according to an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is an explanatory view of a casting situation.

FIG. 4 is a plan view of an intake manifold.

FIG. 5 is a view taken along line VV in FIG. 4;

FIG. 6 is a view taken along line VI-VI in FIG. 5;

[Explanation of symbols]

 11 Intake manifold 12, 13 Flange 21 First rib 22 Second rib

Claims (1)

(57) [Scope of request for utility model registration] A first rib is provided on an outer wall of an intake pipe along an intake axis, and a second rib intersecting with the first rib and being parallel to a molding direction of a casting mold is provided on the intake pipe. An intake manifold made of cast aluminum characterized by being provided on the outer wall.