JPH041292Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a manifold for automobiles, etc., for guiding exhaust gas discharged from a plurality of cylinders to an outlet pipe.

[Conventional technology]

Traditionally, manifolds have been made of cast metal and have a shape that guides the exhaust gas discharged from the engine's multiple exhaust ports toward the muffler, or they have been made up of multiple pipes and have the function of guiding multiple exhaust gases. A pipe with a similar structure was also used.

[Problem that the idea aims to solve]

Conventional cast iron manifolds have the drawbacks of being heavy, which adversely affects engine performance, and absorbing a lot of heat, which detracts from the exhaust gas temperature and reduces the initial function of pollution control devices such as cataract converters. It was hot. In addition, pipe manifolds require complicated pipe bending, cutting, difficult welding, etc., making it difficult to achieve a compact design, and have the disadvantage that the exhaust system generates large engine-transmitted noise. Utility Application No. 51-89915 is equipped with a heat-insulating inner cylinder consisting of a front half and a rear half inside the cast manifold case in the upper and lower halves, and a through hole provided in the front half. There are examples where an inlet pipe is installed between the cylinder and the cylinder. This example is designed to have a heat retention effect by using a double case, but since the protruding end of the inlet inner tube is located at the location of the through hole in the front half of the inner tube, the exhaust gas is discharged into and out of the inner tube. , exhaust interference is likely to occur, and problems arise in which transmitted sound is generated, the exhaust gas temperature decreases due to heat transmission, and the function of pollution control devices such as a catalyst converter is thereby deteriorated.

[Means to solve the problem]

Therefore, the present invention overcomes the drawbacks of the conventional exhaust gas guide with a structure consisting of a press-formed sheet metal part and an exhaust gas guide that can take the form of a pipe or other structure as required. a flange 3, an exhaust gas guide 5 that is attached to the exhaust gas port hole 2 of the flange and protrudes almost to the center of the manifold, a sheet metal manifold case 6, and a sheet metal outer case 11 that covers the outer periphery of the manifold case 6. The structure consists of the sheet metal manifold case 6 and the heat insulating material 12 between the outer case 11. The exhaust gas guide 5 referred to here has a structure formed to have the function of guiding exhaust gas rearward in a rectified state while avoiding exhaust interference as much as possible, that is, a plurality of guide pipes attached to each exhaust gas port hole 2. 5a or a guide plate 5 having burring holes 8 that fit each exhaust gas port hole 2.
b, and furthermore, a guide case 5 in which a concavo-convex portion 7 that fits each exhaust gas port hole 2 is formed by press working.
Examples include c.

[Effect]

Manifolds for automobile engines and the like having such a structure are light in weight because they are made of sheet metal parts, and are easy to assemble and assemble. Directs exhaust gas rearward in a rectified state while avoiding exhaust interference as much as possible. Further, by adopting a four-layer structure including a heat insulating material, it is possible to prevent a drop in exhaust gas temperature, prevent functional deterioration of pollution control devices such as a catalyst converter, and prevent engine transmission sound.

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an exploded perspective view of a first embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of the device installed in an engine exhaust head. This device consists of a flange 3, an exhaust gas guide 5, and a manifold case 6 made of sheet metal. The flange 3 is made of sheet metal and has a mounting hole 1 for attaching to the engine head and a plurality of (three in this case) exhaust gas port holes 2. A guide pipe 5a, which is a structural example of an exhaust gas guide 5, is provided by welding to the exhaust gas port hole 2 of this flange and protrudes to approximately the center of the manifold. The outside thereof is covered by two upper and lower sheet metal manifold cases 6. The manifold case 6 made of sheet metal has a space at the front where the exhaust gas guide 5 can be accommodated, and is gradually tapered at the rear so that it can be connected and integrated with the outlet pipe. In this example, the upper and lower parts are press-formed into a symmetrical shape with two halves, but they are also formed by bending the two halves together, deforming the pipe, and even using ultra-deep drawing, etc., all of which are basically press-formed. It is manufactured by If the manifold has this structure, first of all,
The guide pipe 5a that protrudes long into the manifold prevents exhaust interference, and the sheet metal manifold case 6 covering the guide pipe 5a reduces transmitted sound due to its double structure. It also has the effect of keeping the exhaust gas warm, and also has a rectifying effect. If the outside of the sheet metal manifold case 6 is further covered with a sheet metal outer case 11 with a space left, the above effect becomes even more remarkable. If a heat insulating material 12 such as glass wool, which is formed into a shape suitable to fill the gap between the outer case 11 and the sheet metal manifold case 6, is loaded, the heat insulating effect will be increased and the exhaust gas will be reduced. It is possible to reduce heat absorption, make the cataract converter work more efficiently, and further reduce transmitted sound. Further, a connecting flange 13 is provided on the outlet side to enable connection with the outlet pipe, and to restrain and integrate the two upper and lower sheet metal manifold cases 6, 6 on the outlet side. Although another structural example of the exhaust gas guide 5 is shown in FIG. 3, it may also be a guide plate 5b having burring holes 8 that fit each exhaust gas port hole 2. As the name suggests, each burring hole 8 is provided so as to protrude during press molding of the guide plate 5b. It is possible to adopt various embodiments in which the guide plate 5b having the burring hole 8 is replaced with the guide pipe 5a in FIG. A structural example of the exhaust gas guide 5 is further shown in FIG. This is a guide case 5c in which a concave and convex portion 7 that fits each exhaust gas port hole 2 is formed by press working. This guide case 5c has a structure in which the upper and lower parts are welded together, and a plurality of ventilation holes are formed to guide exhaust gas to the vicinity of the center of the manifold, similar to the guide pipe 5a. Attachment to the flange 1 is by welding. Then, the outside thereof is covered with a sheet metal manifold case 6 to enable collection and exhaustion. Furthermore, by covering the outside with a heat insulating material 12 such as the above-mentioned molded glass wool, it is possible to further enhance the prevention of transmitted sound and the heat retaining effect as described above.

[Effect of the idea]

Since the manifold for automobile engines of the present invention has the above structure, it can prevent exhaust interference within the manifold, obtain a rectification effect, reduce transmitted sound, and further reduce exhaust gas temperature. This reduces the drop. Therefore, it is possible to obtain the effect that pollution control devices such as cataract converters also function normally. Since it is mainly composed of press-formed sheet metal parts, it is lighter (approximately 40% less) than cast metal parts.
Moreover, it can be designed compactly and can be easily installed even in a small space on the engine exterior. Furthermore, since the main sheet metal parts are obtained by press forming, accuracy can be ensured, manufacturing and assembly are easy, and quality can therefore be stabilized.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a first embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of the device installed in an engine exhaust head. 3 and 4 are exemplary perspective views of the exhaust gas guide. 1... Mounting hole to engine head, 2... Exhaust gas port hole, 3... Flange, 5... Exhaust gas guide, 5a... Guide pipe, 5b... Guide plate, 5c... Guide case, 6... ... Sheet metal manifold case, 8... Burring hole, 11...
...Outer case, 12...Heat insulation material such as glass wool.

Claims (1)

[Claims for Utility Model Registration] 1. A flange 3 having a mounting hole 1 for the engine head and an exhaust gas port hole 2, and an exhaust gas installed in the exhaust gas port hole 2 of the flange and protruding almost to the center of the manifold. gas guide 5
A manifold for an automobile engine or the like, comprising a sheet metal manifold case 6, a sheet metal outer case 11 covering the outer periphery of the manifold case 6, and a heat insulating material 12 between the sheet metal manifold case 6 and the outer case 11. 2. The manifold for an automobile engine or the like as claimed in claim 1, wherein the exhaust gas guide 5 is a plurality of guide pipes 5a attached to each exhaust gas port hole 2. 3. A manifold for an automobile engine or the like according to claim 1, wherein the exhaust gas guide 5 is a guide plate 5b having burring holes 8 that fit into each exhaust gas port hole 2. 4. A manifold for an automobile engine or the like according to claim 1, wherein the exhaust gas guide 5 is a guide case 5c in which a concavo-convex portion 7 that fits each exhaust gas port hole 2 is formed by press working.