JPH02146251A - Intake manifold of internal combustion engine - Google Patents

Abstract

PURPOSE:To make it possible to install high temperature parts to a manifold main body of a low heatproof property and to secure the intrinsic light weight by installing high temperature parts such as an EGR valve to a manifold main body made of a synthetic resin through a heatproof adapter. CONSTITUTION:While plural branch pipes 2 are projected from an intake mani fold main body 1 which is made of a synthetic resin, flanges 3 responding to the ports of cylinder heads are formed at the opening ends of the branch pipes 2. In this case, an adapter 4 is formed in a flat plate form by using a heatproof material such as aluminum, and by attaching a cooling fin 4a for a reinforce ment concurrently to the rear side of the adapter 4. And the adapter 4 is fixed to the manifold main body 1 with a bolt 9 so as to block the opening 5 of the manifold main body 1. On the other hand, an EGR valve 6 and a fixed resistor 7 for preheating purpose which are high temperature parts are installed to the adapter 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intake manifold for an internal combustion engine, and more particularly to a synthetic resin intake manifold.

[Conventional technology]

In recent years, reinforced plastics have been used as a material for intake manifolds in order to reduce the weight of internal combustion engines.

However, the upper limit of the heat resistance temperature of reinforced plastic is 2.
Since the temperature is around 006C, EGR (Exhaust Gas Recirc.
It has not been possible to directly attach high-temperature parts such as valves for exhaust gas recirculation (exhaust gas recirculation) to the intake manifold.

Therefore, in order to eliminate such drawbacks, we developed the
In the idea of a synthetic resin intake manifold disclosed in Japanese Patent No. 29466, a plurality of inners made by blow molding or two half pieces made by injection molding are bonded together using adhesive or welding, and a plurality of inners are formed by low-pressure molding. It has been proposed that insert molding is performed to form an outer layer around the inner layer to reinforce the inner layer.

[Problems to be solved by the present invention]

However, the device disclosed in the above-mentioned Japanese Utility Model Publication No. 62-29466 has a double structure in which an outer layer is formed around an inner layer, so the manufacturing process is many (which results in a considerable wall thickness). Therefore, there is a problem that the original purpose of using the resin material, that is, weight reduction cannot be achieved.

[Means for solving problems]

The present invention has been made in order to solve the above-mentioned conventional problems, and its gist is to attach high-temperature parts such as exhaust gas recirculation device valves to a synthetic resin manifold body via a heat-resistant adapter. The intake manifold of an internal combustion engine is characterized in that it is attached to the intake manifold.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in FIGS. 1 and 2. Note that FIG. 1 is a partially cutaway front view of a synthetic resin intake manifold according to the present invention, and FIG. 2 is a diagram showing the characteristics of the manifold.

In the drawing, l denotes an intake manifold body made of synthetic resin material, in which a plurality of branch pipes 2.2 are independently protruded in parallel, and the outer periphery of the open end of each branch pipe 2. A flange portion 3 is formed on the cylinder head for attachment to a boat of the cylinder head.

Reference numeral 5 denotes an opening formed in the manifold main body l, and is formed at a position where an adapter 4, which will be described later, is to be attached.

The adapter 4 is formed into a flat plate shape from a heat-resistant member such as aluminum, heat-resistant resin, or ceramic. Cooling fins 4a that also serve as reinforcement are provided on the back surface of the adapter 4, and the opening 5 of the manifold body 1 It is fixed to the manifold main body 1 with bolts 9 so as to close it.

6 is a pulp that controls the recirculation amount of the exhaust gas recirculation system (hereinafter referred to as EGR), which is a high-temperature component, and 7 is a fixed resistor for preheating the air-fuel mixture, which is attached to the adapter 4 with bolts. There is. Note that 8 in the figure is an air-fuel mixture suction cylinder formed in the manifold body 1.

[Effect of the embodiment]

High-temperature exhaust gas flows through the EGR valve 6, and since the EGR valve 6 is attached to the manifold body 1 via the adapter 4, as shown in FIG.
When exhaust gas at 350'C flows through the EGR valve 6 in an atmosphere of 0°, the temperature of the connector surface of the EGR valve 6 with respect to the adapter 4 is approximately 167°C, and the surface temperature of the manifold body 1 is 150°C. It will be about.

In this way, the surface temperature of the intake manifold body 1 is insulated to below about 200° C., which is the heat resistance temperature of the resin material.

〔Effect of the invention〕

As described above, the intake manifold for an internal combustion engine according to the present invention has a structure in which high-temperature parts such as a valve for an exhaust gas recirculation device are attached to a synthetic resin manifold body via a heat-resistant adapter. This has the remarkable effect of making it possible to attach high-temperature parts to a resin manifold body with low heat resistance.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a synthetic resin intake manifold according to the present invention, and FIG. 2 is a diagram showing the characteristics of the manifold. 5...Opening part, 6...Valve for exhaust gas recirculation device, 7...Fixed resistor for preheating. 1... Manifold body, 2... Branch pipe, 3...
Flange part, 4...Adapter, Fig. 1 Fig. 2 Time lock

Claims (1)

[Claims] An intake manifold for an internal combustion engine, characterized in that high-temperature parts such as a valve for an exhaust gas recirculation device are attached to a synthetic resin manifold body via a heat-resistant adapter.