KR20010002325A - Exhaust manifold of engine for automobile - Google Patents

Abstract

PURPOSE: An exhaust manifold of a vehicle engine is provided to improve the purification efficiency of exhaust gas by raising temperature of a manifold high when an engine is started. CONSTITUTION: An exhaust manifold of a vehicle engine includes spaces(22a,22b) having entrances(23a,23b) closely positioned in the vicinity of an engine body(10) and an exhaust pipe at the inner and outer walls(21b,21a) of an exhaust manifold(20), wherein raising temperature of the manifold high is accelerated by the electric heating of the exhaust gas filled in the spaces. The spaces are formed entirely through the walls except both ends portions of a flange of the manifold. The exhaust manifold accelerates early achievement of the high temperature by maximally securing the area for the electric heating of the exhaust gas.

Description

Exhaust manifold of engine for automobile

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust manifold of a vehicle engine, and in particular, by forming a predetermined space inside a wall of an exhaust manifold and allowing exhaust gas to be filled therein, thereby promoting early preheating of the manifold, thereby allowing early exhaustion of engine starting. As the heat of the gas is almost lost to the manifold, the temperature of the exhaust gas is lowered, and the exhaust manifold of the vehicle engine can be prevented from reducing the catalyst purification efficiency.

In general, the exhaust manifold 20 of the vehicle engine is installed between the engine main body 10 and the exhaust pipe 30 as shown in FIG. 2 and collects the exhaust gas burned in the cylinder and discharges the exhaust gas to the exhaust pipe. It is usually made of cast iron.

In the early stage of engine start-up, most of the heat of the exhaust gas is lost to the exhaust manifold, which inevitably lowers the temperature of the exhaust gas, which causes the catalyst to not fully function properly, for example, about 600 ° C. There was a problem that the purification efficiency of the catalyst falls because it is crazy.

In other words, the temperature rise of the catalyst due to the exhaust gas cannot be expected until the exhaust manifold takes heat from the exhaust gas to some extent, so that exhaust gas that is not sufficiently purified at the start of the engine is released into the atmosphere. .

Accordingly, the present invention has been devised in view of the above, and in order to quickly raise the temperature of the exhaust manifold at the beginning of engine start, by forming a predetermined space in which exhaust gas can stay in the manifold wall, It is possible to promote the premature high temperature of the exhaust manifold, so that it is possible to raise the catalyst to the appropriate temperature by using the high temperature exhaust gas heat within a short time after starting the engine, and ultimately increase the exhaust gas purification efficiency through the catalyst. The purpose is to provide an exhaust manifold for a vehicle engine.

1 is a schematic cross-sectional view showing the structure of an exhaust manifold according to the present invention;

2 is a schematic showing the location of an exhaust manifold

<Explanation of symbols for main parts of drawing>

10 engine body 20 exhaust manifold

30: exhaust pipe

21a, 21b: wall 22a, 22b: space part

23a, 23b: doorway

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to an exhaust manifold of a vehicle engine, in which outer spaces and inner walls of the exhaust manifold have respective space portions each having an entrance close to the engine body side and the exhaust pipe side, and filled in the space portion. It is characterized by consisting of a structure that can accelerate the premature high temperature of the manifold by the heat transfer action of the exhaust gas.

In particular, the space portion is characterized in that it is formed over the entire length of the wall except for the flange portion at both ends of the manifold.

This will be described in more detail as follows.

1 is a cross-sectional view schematically showing the structure of the exhaust manifold according to the present invention.

Exhaust manifold 20 of the present invention is characterized in that to ensure the maximum heat transfer area with the exhaust gas to facilitate the initial high temperature.

To this end, predetermined spaces 22a and 22b are formed inside the manifold outer wall 21a and inside the inner wall 21b, respectively, and in each of the spaces 22a and 22b. An inlet and outlet 23a proximate to the engine main body side and an inlet and outlet 23b proximate to the exhaust pipe side are formed to allow the exhaust gas to flow into the space.

Since the spaces 22a and 22b are formed over the entire length of the wall except for the flange portion of the wall, the heat transfer action with the exhaust gas can be performed over most of the wall area.

Thus, the spaces 22a and 22b including the entrances 23a and 23b may be independently provided one for each port of the manifold, and preferably within a range that does not lower the stiffness of the manifold. It is better to allow the spaces 22a in each port to communicate with each other, and furthermore, the spaces 22a in the outer wall 21a and the spaces 22b in the inner wall 21b More preferably, it is possible to secure the heat transfer area with the exhaust gas so as to communicate with each other.

Therefore, the exhaust gas discharged from the cylinder at the beginning of the engine is sent to the exhaust pipe side, and part of it is introduced into the space part through each of the upper and lower entrances and filled therein.

As the hot exhaust gas is filled in the space portion, the heat transfer between the exhaust gas and the manifold wall can be actively performed, and the manifold's own temperature rapidly rises in a short time, so after a certain time has elapsed. Does not lose heat of the exhaust gas to the manifold that has become hot.

As a result, the hot exhaust gas can be sent directly to the exhaust pipe and used to raise the temperature of the catalyst, thereby significantly shortening the time taken for the catalyst to rise to a temperature sufficient to function properly.

That is, in the past, it took a lot of time for the catalyst temperature to reach the proper temperature by taking heat of exhaust gas into the manifold for a considerable time at the start of engine start, but in the case of the present invention, it is possible to prematurely increase the temperature of the manifold. After a certain time, the temperature of the catalyst can be easily increased to an appropriate temperature, thereby increasing the exhaust gas purification efficiency through the catalyst even at the start of the engine.

As described above, the present invention has an advantage of improving the exhaust gas purification efficiency at the beginning of engine start by providing a means for promoting early temperature increase of the manifold at the start of engine start.

Claims (2)

In the exhaust manifold of a vehicle engine, The outer wall and the inner wall of the exhaust manifold are formed with respective space portions having entrances adjacent to the engine body side and the exhaust pipe side, respectively, and prematurely high temperature of the manifold by the heat transfer action of the exhaust gas filled in the space portion. Exhaust manifold of the vehicle engine, characterized in that the structure is configured to be promoted. The exhaust manifold of a vehicle engine according to claim 1, wherein the space portion is formed over the entire length of the wall except for flange portions at both ends of the manifold.