JPH037533Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an independent exhaust manifold structure for a multi-cylinder engine.

The independent exhaust manifold is suitable for use in turbocharged vehicles in view of exhaust efficiency, exhaust pulsation, exhaust interference, and the like. This manifold is
Each cylinder is connected to the port collecting section. This port collection section has a number of exhaust passages corresponding to the number of cylinders, and each passage is separated by a partition wall. The exhaust discharge part of the port gathering part is connected to the turbine side of the turbocharger.
The above-mentioned independent exhaust manifold, including the port gathering portion, is made of cast metal. As a result, when operated under severe conditions, the manifold would become hot and the port collection area, especially the partition wall area, would break. In order to solve this problem, the manifold could be made of a material with high heat resistance, but this would inevitably result in increased costs.

An object of the present invention is to provide an independent exhaust manifold structure that eliminates the above-mentioned problems without increasing costs.

The present invention is characterized in that only the partition wall part of the port gathering part, which is exposed to the most severe thermal conditions, is made of a partition plate made of a material with excellent heat resistance and is a separate member from the manifold main body. do.

Hereinafter, a detailed explanation will be given with reference to illustrated embodiments.

In FIG. 1, reference numeral 1 generally indicates an independent exhaust manifold according to the present invention. This manifold 1 includes a manifold body 2 and a partition plate 3.
It is made up of. The manifold body 2 includes a flange 4 attached to a cylinder head (not shown), a flange 5 to which a turbocharger (also not shown) is connected, a port collection part 6 provided adjacent to the flange 5, and a port collection part 6 and each part. It consists of exhaust passages 7, 8, 9, and 10 that connect to the exhaust port of the cylinder. One ends of the exhaust passages 7, 8, 9, and 10 are connected to the exhaust ports of the first to fourth cylinders, respectively,
The other end is connected to the exhaust introduction section 6a of the port collection section 6. The illustrated embodiment is an example of a four-cylinder engine, and has four exhaust passages. Terminal openings 7 of the individual exhaust passages 7, 8, 9, and 10 that are collected in the exhaust introduction part 6a of the port collection part
The shapes of a, 8a, 9a, and 10a are each fan-shaped. That is, when the terminal opening of the exhaust passage is viewed from the exhaust discharge part side of the port gathering part 6, it is divided into four parts by the cross-shaped partition wall 11. The exhaust discharge part 6c of the exhaust gas collection port part 6 opens into the flange 5. On the inner periphery of the port gathering part 6,
Partition wall 1 separating each exhaust passage 7 to 10 from each other
Four fitting grooves 6b are formed corresponding to position 1.

On the other hand, the partition plate 3 is constructed by combining plates made of a material with excellent heat resistance, such as stainless steel or ceramic, in a cross pattern. This partition plate 3
The material constituting the manifold body 2 is selected to have a thermal expansion coefficient close to that of a relatively inexpensive material constituting the manifold body 2.

As shown in FIG. 2, each end of the partition plate 3 is fitted into the fitting grooves 6b, 6b, . . . .
As a result, the partition plate 3 that is substantially continuous with each of the exhaust passages 7, 8, 9, and 10 and forms an independent passage for each of the exhaust passages 7, 8, 9, and 10 in the port gathering portion 6 is provided in the manifold body. If the partition plate is made of a material having a thermal expansion coefficient larger than 2, a gap g is provided between the end of the partition plate and the fitting groove 6b in order to escape the thermal expansion of the partition plate. provided.

In the embodiment shown in FIG. 2, the partition plate 3 is retrofitted to the manifold body 2 manufactured by casting, but if the partition plate is formed of a material with a coefficient of thermal expansion that is not much different from that of the manifold body, the third As shown in the figure, this partition plate 3A is connected to the manifold body 2.
It may be poured in at the time of casting.

Next, to explain the operation, the exhaust gas sequentially discharged from the exhaust port of each cylinder (not shown) passes through the respective exhaust passages 7, 8, 9, and 10, reaches the exhaust introduction part 6a of the port collection part 6, and is connected to the partition. The exhaust gas is guided from the exhaust discharge part 6c through a passage defined by the plate 3 toward a turbocharger (not shown). At this time, the exhaust gas discharged from each cylinder is guided independently and smoothly by the partition plate of the port gathering portion, and is efficiently guided to the turbocharger without interfering with each other.

As described above, according to the present invention in which a partition plate made of a heat-resistant material is provided at the port gathering portion, which is a heat collecting location, breakage of the gathering portion due to overheating can be prevented.
Furthermore, since it is sufficient to use a heat-resistant material only in the port gathering portion, an independent exhaust manifold structure without breakage can be obtained at low cost.

Furthermore, the cross-sectional shape of the partition plate is matched to the terminal opening shape of the other end of each manifold that gathers in the port collection area, and the partition plate is provided almost continuously at the other end of each manifold, so that the exhaust air is Flows smoothly from each manifold to the port collection area without being affected by the plate.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing one embodiment of the independent exhaust manifold structure of the present invention, Fig. 2 is a front view of the same port collecting section as above, and Fig. 3 is a port collecting part showing a different embodiment of the present invention. It is a front view. 1... Independent exhaust manifold, 2... Manifold main body, 3... Partition plate, 6... Port collection part,
6a...Exhaust introduction part, 6c...Exhaust discharge part, 7~
10...Exhaust passage, 7a, 8a, 9a, 10a...
...Manifold end opening.

Claims (1)

[Claims for Utility Model Registration] (1) One end is connected to the exhaust port of each cylinder,
In an independent exhaust manifold in which the other end is assembled at a port collection part, a heat-resistant material having a coefficient of thermal expansion approximately equal to that of the manifold body is used between the exhaust introduction part of the port collection part and the exhaust discharge part. is formed, has a cross-sectional shape that matches the terminal opening shape of the other end of each manifold that gathers in the port gathering part, and is substantially continuous with the other end of each manifold, and the exhaust gas discharged from each exhaust port is introduced into the exhaust port. An independent exhaust manifold structure characterized by providing a partition plate that independently guides each manifold from the exhaust discharge section to the exhaust discharge section. (2) The independent exhaust manifold structure according to claim 1, wherein the partition plate is cast into the port gathering portion. (3) The scope of the utility model registration claim, which is characterized in that the above-mentioned partition plate is fitted into the port collection part, and a gap is formed at the fitting part of the two to escape thermal expansion of the partition plate. The independent exhaust manifold structure described in item 1.