JPS6231643Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat insulator for an intake and exhaust manifold provided between an intake manifold and an exhaust manifold of an automobile engine.

One example of the arrangement of intake and exhaust manifolds for automobile engines is the counterflow type. This combines the intake manifold and exhaust manifold on one side of the engine, which is advantageous in terms of making the engine more compact. However, since the intake manifold and exhaust manifold are close to each other, there is no insulation between them. It is necessary to provide a body.

As an example of the above-mentioned heat insulating material, there is a conventional heat insulating material made by press-forming a relatively thick iron plate and applying heat-resistant paint to the surface of this iron plate, but in this case, the heat insulation properties are poor and vibration absorption is Due to the low capacity, the vibrations generated in the manifold during engine operation were poorly damped, and could become a source of noise.

In order to solve the above-mentioned problem, there is also a device in which a heat insulating material such as asbestos is sandwiched between a pair of press-formed panels made of a thin steel plate with a thickness of about 0.5 mm, for example. However, in this case, the following problem occurs.

(1) If the shape of the gap between the intake and exhaust manifolds where a heat insulator is to be installed is complex and has a large three-dimensional curve, the panel will be significantly plastically deformed using a press to conform to this shape. However, as mentioned above, thin steel plates have poor malleability compared to thicker steel plates and are difficult to press-form in one go, so many pressing steps are required to obtain the desired shape. Therefore, the cost will be very high.

(2) When a heat insulating material such as asbestos is placed between the panels, the connection strength between the two panels is low and the integration of the two panels is insufficient, resulting in low bending rigidity and other low mechanical strength. For this reason, for example, when a bolt is passed through a through hole formed in the panel to fasten it to a manifold, buckling deformation occurs near the through hole, reducing the durability of the mounting part or causing the mounting to become loose, resulting in abnormal noise (such as chatter).

The present invention was developed based on the above circumstances, and its purpose is to create a heat insulating material for intake and exhaust manifolds that can be easily press-formed to reduce processing costs, as well as having high rigidity and improved durability and mounting strength. It's about offering your body.

That is, the heat insulating body of the present invention includes a pair of panels formed by press-molding sheet metal and having at least a portion of their edges connected to each other, a heat insulating material such as asbestos or heat-resistant resin sandwiched between these panels, and A mounting plate formed from a single metal plate separate from the above panel, whose end is sandwiched between the two panels and fixed to the edge of the panel by welding, caulking, etc. This is a heat insulator for the intake and exhaust manifolds.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a counterflow type intake/exhaust manifold, and numeral 1 in the figure is the intake manifold. A carburetor mounting portion 2 is provided in the center of the intake manifold 1, and intake passages 3, 3 are branched from this portion. The ends 3a, 3a of these intake passages 3, 3 are fixed to the cylinder head of the engine.

Furthermore, an exhaust manifold 6 is provided on the lower side of the intake manifold 1 in the figure with a heat insulator 5 interposed therebetween. This exhaust manifold 6
is adapted to fix the ends 7a, 7a of the exhaust passages 7, 7 to the cylinder head of the engine,
Further, an exhaust pipe (not shown) is connected to the merging portion 7b of each exhaust passage 7,7.

On the other hand, the heat insulator 5 is constructed as follows. That is, in FIG. 2, numerals 9 and 10 are a pair of panels. These panels 9 and 10 are each press-formed from a thin steel plate (sheet metal) with a thickness of about 0.5 mm, and connect an edge 9a extending almost all around the circumference of one panel 9, that is, a mounting plate 12 to be described later. The edges other than those points are curled and connected to the edge 10a of the other panel 10 by pressure. In addition, between these panels 9 and 10, there is a heat insulating material 1 made of asbestos or heat-resistant synthetic resin.
1 is attached.

A mounting plate 12 is connected to a portion of the panels 9 and 10. The mounting plate 12 is press-molded from a thick metal plate separate from the panels 9 and 10. Then, as shown in FIG. 2, the end portion 12a of the mounting plate 12 is sandwiched between the panels 9 and 10, and is fixed to the edges of the panels 9 and 10 by, for example, spot welding 13 performed at multiple locations. ing. The mounting plate 12 is a portion to be mounted to the exhaust manifold 6, has a shape that is greatly curved three-dimensionally in accordance with the shape of the mounting seat of the exhaust manifold 6, and has a mounting hole 15 formed therein. The exhaust manifold 6 is fixed to the exhaust manifold 6 by inserting a bolt into the hole 15 and screwing it into a screw hole (not shown) formed in the mounting seat of the exhaust manifold 6.

Also, mounting holes 16 are provided on both sides of the heat insulator 5.
16 are formed, and bolts (not shown) are inserted into these holes 16, 16 to connect the exhaust manifold 6.
By screwing into the screw holes 17, 17, both sides of the heat insulator 5 are fixed to the exhaust manifold 6.

Furthermore, a heat exchange hole 18 is provided approximately in the center of the heat insulator 5.
is formed so that a part of the heat of the exhaust manifold 6 can be transferred to the intake manifold 1. A plurality of through holes 19 are formed around this heat exchange hole 18, and through holes 20 are screwed into the intake manifold 1 and exhaust manifold 6, respectively, at positions corresponding to these through holes 19. Holes 21... are formed. Then, bolts (not shown) are inserted into the through holes 19..., 20... and screwed into the screw holes 21... to firmly connect and integrate the intake/exhaust manifolds 1, 6 and the heat insulator 5 with each other. There is.

The present embodiment is constructed as described above, and instead of press-forming one panel over the entire surface of the heat insulator 5, the mounting plate 12 is molded separately from the panels 9 and 10. With this structure, only the mounting plate 12 can be separately press-molded at the mounting portion which is largely curved three-dimensionally depending on the shape of the mounting seat of the manifold. Therefore, even if a thin steel plate with poor malleability is used as the material for the panel, it can be easily formed by a single press process, and the processing cost is significantly reduced even when taking into account the effort of spot welding the mounting plate 12. .

Furthermore, since a thick metal plate (for example, twice the thickness of the panel) can be used as the material for the mounting plate 12, buckling is less likely to occur around the mounting hole 15.
It can be firmly fixed, and the attachment part to the manifold has high rigidity and durability.
In addition, since the heat insulating body 5 does not easily cause looseness during engine operation, the heat insulating body 5 does not vibrate and produce abnormal noise, which is effective in preventing noise.

In addition, in the above embodiment, a mounting plate was provided at only one location, but it is of course possible to provide mounting plates with the same purpose at locations other than the embodiment, and the number of mounting plates and Specific aspects such as arrangement and shape can be modified in various ways. Further, the means for connecting the mounting plate to the panel is not limited to spot welding, but may be fixed by other welding or mechanical pressure bonding such as caulking. Furthermore, it goes without saying that the shape of the manifold is not limited to the embodiment.

The present invention is constructed as described above, and includes a pair of panels formed by press-forming sheet metal and having at least a portion of their edges connected to each other, and a heat insulating material sandwiched between these panels. , and a mounting plate that is formed from a single metal plate separate from the above-mentioned panel and whose end is sandwiched between the two panels and fixed to the edge of the panel. Therefore, for example, even if the mounting part for the manifold has a large three-dimensional curve and swells, by press-forming the mounting plate separately from the panel, even if it is a thin panel, it will be slightly curved. It can be easily press-formed using a simple process, making it possible to reduce processing costs. In addition, when mounting holes are formed in the mounting plate mentioned above and the mounting plate is fastened to the manifold using bolts, etc., the mounting strength and rigidity are high because the mounting plate is a single plate, and the mounting holes around the mounting holes are tightened. Durability can be improved as bending deformation is less likely to occur.

In addition, as mentioned above, the mounting strength is high, and in combination with the insulation material such as asbestos interposed between the panels, the damping performance against vibration is good.
It has great effects, such as being able to suppress the occurrence of abnormal noises.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view of an intake/exhaust manifold and a heat insulator, and FIG. 2 is a sectional view of the heat insulator along the line - in FIG. 1...Intake manifold, 5...Insulator, 6...
Exhaust manifold, 9, 10...Panel, 11...
Insulating material, 12... Mounting plate, 12a... End of mounting plate.

Claims (1)

[Scope of utility model registration request] In an intake/exhaust manifold heat insulating body provided between an intake manifold and an exhaust manifold that are close to each other, the heat insulating body includes a pair of panels formed by press-forming sheet metal and having at least a portion of their edges connected to each other. and a heat insulating material sandwiched between these panels, and a heat insulating material formed from a single metal plate separate from the above panel, the end of which is sandwiched between the above two panels and attached to the edge of the panel. A heat insulating body for an intake/exhaust manifold, comprising a mounting plate to which it is fixed.