JP2000249008A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light intake manifold having a good durability, wherein a load acted bypassing an intake pipe is received at an outer shell member of an intake manifold connected to the intake pipe, the load received on the outer shell member is transferred to a cylinder head, and the load is not acted on a joining part of the outer shell member and a divided flow member and the divided flow member. SOLUTION: An intake manifold 10 interposed between an intake port 3h connected to each cylinder of a multiple cylinder engine and an intake pipe 2, is formed providing with an outer shell member 11 having an intake pipe hole 11p connected to the intake pipe 2 and an opening part 11q connected to a cylinder head 3, and a divided flow member 12 having a penetrating hole 12h communicated with the intake port 3h, and the divided flow member 12 is disposed in the outer shell member 11 across the opening part 11q.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an intake manifold provided between an intake port connected to each cylinder of a multi-cylinder engine and an intake pipe.

[0002]

2. Description of the Related Art In an automobile or a stationary multi-cylinder engine, in order to uniformly intake air into each cylinder (cylinder),
An intake manifold (intake chamber) is interposed between the intake port formed in the cylinder head and the intake pipe,
Air purified by an air cleaner is supplied from an intake pipe to the intake manifold, divided by the intake manifold, and distributed to each cylinder via each intake port.

The intake manifold has a complicated structure for distributing intake air flowing from one intake pipe to each cylinder, and is conventionally manufactured by casting using cast iron or an aluminum alloy. .

[0004] However, the intake manifold made of cast iron or aluminum alloy needs to be machined, and in this machining, it is necessary to give sufficient consideration to the selection of cutting conditions and tool shapes, the order of machining, and the like. Manufacturing costs are high, and there is a limit to weight reduction.

[0005] Therefore, recently, this intake manifold has been molded and manufactured from a synthetic resin, such as a resin intake manifold described in Japanese Patent Application Laid-Open No. 9-177625.

[0006] The molding with the synthetic resin is generally performed by an injection molding method or a hot press molding method. However, it is not possible to mold a hollow body having a space inside such as an intake manifold by integral molding. Since the process becomes complicated and the manufacturing cost increases, as in an intake chamber described in JP-A-9-88744, it is divided into two or more members and molded, and after this molding, the members are assembled and integrated. In many cases, the casting process is facilitated and the cost is kept low.

As shown in FIG. 5, the intake manifold 1 having this divided structure has a first chamber 7 having a first connection portion 7a connected to an intake pipe, and a second chamber 8h having a portion 8h connected to each intake port. It is formed separately from the chamber 8. Flange surfaces 7f and 8f are provided at the joints of the divided members 7 and 8, respectively.
f and 8f are joined by welding or bolting.
In the intake chamber 1 shown in FIG. 5, a reinforcing plate 9 is provided between the flange surfaces 7f and 8f for a reason described later.

[0008]

On the other hand, the intake pipe connected to the intake manifold is provided with an EGR valve and a PCV (blow-by gas introduction) valve in view of the layout with various devices attached to the engine. There are many. Since these loads act on the intake manifold via the intake pipe, the loads also act on the flange surfaces between the members.

However, these members are relatively easy to be formed into thin parts by die-casting, and are thin to reduce the weight as much as possible, and have a large opening. Since it is formed, and it is made of resin, it is difficult to secure rigidity, and sufficient rigidity cannot be secured. For this reason, there is a problem in that it cannot withstand the load through the intake pipe, and the joint surface between the members and a part or the whole of the members are deformed or damaged. Of course, there is a problem that it is possible to form a thick wall having sufficient strength, or it is not preferable because the weight increases.

In the intake chamber of Japanese Patent Application Laid-Open No. 9-88744, shown in FIG. , 8f, a reinforcing plate 9 is additionally provided. However, if the reinforcing plate 9 is provided, a new problem of cost increase due to an increase in weight and an increase in parts arises.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object thereof is to receive a load acting via an intake pipe by an outer shell member of an intake manifold connected to the intake pipe. An object of the present invention is to provide a lightweight and highly durable intake manifold that transmits the load received at step (1) to the cylinder head as it is and does not apply this load to the joint between the outer shell member and the flow dividing member or the flow dividing member itself.

[0012]

An intake manifold for achieving the above object is an intake manifold interposed between an intake port connected to each cylinder of a multi-cylinder engine and an intake pipe. The manifold is formed having an outer shell member having an intake pipe hole connected to the intake pipe and an opening connected to the cylinder head, and a flow dividing member provided with a through hole communicating with the intake port. The flow dividing member is disposed inside the outer shell member across the opening.

Further, the outer shell member is formed inside the outer shell member and a first junction portion with the intake pipe and a second junction portion with the cylinder head, and is connected to the flow dividing member. And a junction member, wherein the flow dividing member is formed having a fourth joint portion joined to the third joint portion, and a through hole communicating with each of the intake ports, and a sealing member Abuts on the cylinder head around the intake port via

Further, by forming the outer shell member and the flow dividing member with a synthetic resin, the two can be easily joined and integrated by a method such as friction pressure bonding, and the intake manifold can be manufactured.

[0015] The intake manifold according to the present invention comprises:
It is not always necessary to form the intake manifold only with the outer shell member and the flow dividing member. A reinforcement member or the like may be provided in addition to the outer shell member and the flow dividing member, and these members may be assembled to form the intake manifold.

According to the above construction, the intake manifold is formed having the outer shell member and the flow dividing member, and the outer shell member is connected to both the intake pipe and the cylinder head, and the flow dividing member is provided inside the outer shell member. Since the outer shell member receives most of the load acting on the intake manifold via the intake pipe and transmits it to the cylinder head as it is, this load is applied to the joint between the outer shell member and the flow dividing member. And the rigidity of the joint surface with the flow dividing member and the flow dividing member can be reduced, and the overall weight can be reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an intake manifold according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the intake manifold 10 includes an outer shell member.
11 and a flow dividing member 12.

The outer shell member 11 has a first joint portion 11a for joining with the intake pipe 2 and a second joint portion 11b for joining with the cylinder head 3, and a flow dividing member 12 is formed on the inner surface side.
Is formed by forming a third joint portion 11c for connection to the second member. The first joint 11a is provided with an intake pipe hole 11p, and the second joint 11b is provided so as to surround the opening 11q. The flow dividing member 12 is formed to have a fourth joint 12c for connecting to the outer shell member 11, and a through hole 12h communicating with each intake port 3a.

The outer shell member 11 and the flow dividing member 12 are manufactured using a material suitable for injection molding, such as polypropylene or nylon resin, and can be manufactured with almost no machining.

The two members, the outer shell member 11 and the flow dividing member 12, are integrated by joining the third joint portion 11c and the fourth joint portion 12c or by bolting. This joining can be performed by means such as friction welding in which the joining surfaces are rubbed to generate frictional heat on the joining surfaces, and the synthetic resin material on the joining surfaces is softened and melted and pressed.

Next, the intake manifold 10 and the intake pipe 2
The relationship between the cylinder head 3 and the cylinder head 3 will be described. As shown in FIG. 2, in the intake manifold 10, after the seal ring 4 is inserted into the ring groove 12 a of the flow dividing member 12, the second joint portion 11 b provided on the outer shell member 11 abuts on the cylinder head 3. Then, it is assembled to the cylinder head 3 by bolts (not shown).

By this assembling, the through-hole 12h of the flow dividing member 12 faces each intake port 3h on the cylinder head 3 side, and the seal ring 4 is disposed in the ring groove 12a around the through-hole 12h. 12h through hole and intake port 3
h, a seal is established. And the intake pipe 2
It is connected to a first joint portion 11 a provided on an outer shell member 11 of the intake manifold 10 by a bolt 6 via a gasket 5.
With this configuration, the intake air Ai is distributed from the through holes 12h from the intake pipe 2 via the hollow portion 11h of the intake manifold 10, and is supplied to each intake port 3h.

According to the intake manifold 10 having the above structure, the load acting on the intake pipe 2 is transmitted to the cylinder head 3 via the first joint 11a, the outer shell 11, and the second joint 11b of the outer shell member 11. Will be transmitted to

On the other hand, the flow dividing member 12 is joined to the outer shell member 11 and is in contact with the cylinder head 3 around each intake port 3h.
There is no heavy load.

As shown in FIG. 4, the seal ring 4 is provided on the outer shell member 11A or, though not shown, is assembled by interposing a gasket between the outer shell member 11A and the cylinder head 3A to form a ventilation passage. In this case, the sealing member of the flow dividing member 12A can be removed so that the flow dividing member 12A does not come into contact with the cylinder head 3A. In this case, almost no load is applied to the flow dividing member 12A. Will not be.

As a result, the rigidity of the joints 11c and 12c between the outer shell member 11 and the flow dividing member 12 and the rigidity of the flow dividing member 12 can be reduced while preventing deformation and breakage of each member of the intake manifold. Can be further reduced in weight, and the outer shell member 11 can be integrally molded to have high rigidity, so that deformation and breakage can be prevented and durability can be improved.

[0027]

As described above, according to the intake manifold of the present invention, the following effects can be obtained.

The intake manifold is divided and formed into an outer shell member and a flow dividing member, and the flow dividing member is provided inside the outer shell member.
Since this outer shell member is configured to be connected to the intake pipe and the cylinder head, the load acting on the intake manifold via the intake pipe acts on the outer shell member and is transmitted to the cylinder head as it is. This load can be prevented from acting on the junction between the outer shell member and the flow dividing member and the flow dividing member.

As a result, the rigidity of the junction between the outer shell member and the flow dividing member and the rigidity of the flow dividing member can be reduced while preventing the deformation and breakage of each member of the intake manifold, resulting in a lighter weight and more excellent durability. Can provide an intake manifold.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an intake manifold according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the intake manifold according to the embodiment of the present invention.

FIG. 3 is an exploded side sectional view of the intake manifold according to the embodiment of the present invention.

FIG. 4 is a side sectional view of an intake manifold according to another embodiment of the present invention.

FIG. 5 is an exploded perspective view of an intake manifold according to the related art.

[Explanation of symbols]

 2 Intake pipe 3 Cylinder head 3h Intake port 4 Seal ring 10, 10A Intake manifold 11, 11A Outer shell member 11a, 11Aa First joint 11b, 11Ab Second joint 11c, 11Ac Third joint 11p Intake pipe hole 11q opening Part 12, 12A Dividing member 12c, 12Ac Fourth joint

Claims (3)

[Claims] An intake manifold interposed between an intake port connected to each cylinder of a multi-cylinder engine and an intake pipe, wherein the intake manifold has a hole for an intake pipe connected to the intake pipe and a cylinder head. And a flow dividing member provided with a through hole communicating with the intake port, and the flow dividing member traverses the opening inside the outer shell member. An intake manifold, characterized in that it is arranged as a unit. 2. The outer shell member is formed at a first junction with the intake pipe and a second junction with the cylinder head, and a third junction formed inside the outer shell member and connected to the flow dividing member. And the flow dividing member is formed having a fourth joining portion joined to the third joining portion, and a through hole communicating with each of the intake ports. 2. The intake manifold according to claim 1, wherein the intake manifold comes into contact with a cylinder head around the intake port. 3. The intake manifold according to claim 1, wherein the outer shell member and the flow dividing member are formed of a synthetic resin.