JPS628333Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an exhaust manifold for an internal combustion engine.

The internal combustion engines installed in recent automobiles and the like are equipped with devices for purifying exhaust gas. To purify the exhaust gas of an internal combustion engine, part of the exhaust gas is recirculated into the intake gas to lower the combustion temperature, secondary air is injected into the exhaust manifold to make it more combustible, and a reactor or catalyst is used to purify the exhaust gas. It's cleansing. in this way,
A secondary air pipe and an exhaust gas recirculation pipe must be connected to the exhaust manifold, and they must be separated from each other.
There is an inconvenience that the piping becomes complicated and cannot be made compact.

This idea is an improvement based on these points.
Embodiments of the present invention shown in the drawings will be described below.

An exhaust manifold 2 is connected to an engine block 1 of an internal combustion engine, and an exhaust pipe 3 is connected to the rear end of the exhaust manifold 2. Therefore, in the present invention, when the exhaust manifold 2 has multiple cylinders, it has a plurality of exhaust holes 4 connected to the exhaust ports of each cylinder. A partition wall 5 is provided in the direction to divide the passage into a first passage 6 and a second passage 7. A secondary air pipe 8 is connected to the first passage 6, and an exhaust gas recirculation pipe 9 is connected to the second passage 7. 10 is an intake manifold.

The effect will be explained.

The secondary air is supplied from the secondary air pipe 8 to the first passage 6
Go inside. Then, it flows with the flow of exhaust gas,
At the rear where the partition wall 5 is cut, the exhaust gas is mixed with the exhaust gas flowing through other exhaust holes 4. On the other hand, from the second passage 7, the exhaust gas that is not mixed with secondary air flows into the exhaust gas recirculation pipe 9, and flows into the intake manifold 10.
Reflux to. In this way, the secondary air pipe 8 and the exhaust gas recirculation pipe 9 can be installed close to one side of the exhaust manifold 2, and moreover, it is possible to prevent secondary air from entering the recirculation pipe.

As explained above, this idea divides the exhaust hole on one side of the exhaust manifold into the first passage and the second passage by providing a partition wall in the longitudinal direction of the hole, and connects the secondary air pipe to the first passage. Since the exhaust gas recirculation pipe is connected to the second passage, the secondary air pipe and the exhaust gas recirculation pipe can be connected closely to one side of the exhaust manifold, making the piping simple and compact. Moreover, the partition wall prevents secondary air from flowing into the exhaust gas recirculation pipe.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, and FIG. 1 is a plan view;
FIG. 2 is an enlarged cross-sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a view corresponding to FIG. 1, showing an example in which the direction of the partition wall is changed. 2...exhaust manifold, 4...exhaust hole, 5...
...Partition wall, 6...First passage, 7...Second passage, 8
...Secondary air pipe, 9...Exhaust gas recirculation pipe.

Claims (1)

[Scope of utility model registration request] The exhaust hole on one side of the exhaust manifold is divided into a first passage and a second passage by providing a partition wall in the longitudinal direction of the hole, a secondary air pipe is connected to the first passage, and exhaust gas is recirculated to the second passage. An exhaust manifold for an internal combustion engine characterized by connecting pipes.