JP3204436B2 - Soundproof spacer for engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof spacer for an engine.

[0002]

2. Description of the Related Art In many cases, various attachments and parts are arranged close to the periphery of an engine body of an automobile. However, if there is a gap between the engine body and those devices and parts, a standing wave is generated in the gap when the engine is operating, and this standing wave increases engine noise. was there.

Therefore, Japanese Utility Model Publication No. 59-7545 proposes that a gap between an engine body and peripheral devices and components is filled with a buffer material to prevent the generation of standing waves. . As the cushioning material (soundproofing spacer) arranged in the gap around the engine body as described above, conventionally, a silicone foam formed by foaming silicon, a foamed rubber formed by foaming EPDM or the like, or a urethane foam formed by foaming urethane are conventionally used. Etc. are used.

[0004]

Incidentally, it is desirable that the above-mentioned soundproof spacer has excellent heat resistance in view of the special condition that it is arranged close to the engine body. Particularly, since the exhaust pipe is heated to a high temperature of about 700 ° C., the temperature of the engine case cover and the heat insulator member in the vicinity thereof rises to about 300 to 350 ° C. For this reason, soundproof spacers disposed in gaps and the like formed between them and the cylinder block are required to have high heat resistance. In that regard, silicon foam is advantageous for use as a soundproofing spacer because its heat-resistant temperature is as high as 300 to 350 ° C. However, the silicon foam has a disadvantage that the cost is high because it is expensive compared to other materials.
On the other hand, urethane foam has a low cost and a good sound absorption rate as compared with silicone foam, but has a low heat-resistant temperature of about 150 ° C. or lower, so that it cannot be disposed on a surface exposed to high temperatures as described above. .

The present invention has been devised in view of the above circumstances, and has as its object to provide a soundproof spacer for an engine which has excellent heat resistance and can be reduced in cost.

[0006]

Means for Solving the Problems Claims for solving the above problems
The soundproofing spacer for an engine according to the invention according to Item 1, is disposed in a gap formed between the engine body and an accessory device or component disposed close to the engine body, and noise generated in the gap is provided. the is a soundproofing spacer engine preventing a main body made of urethane foam which is formed by foam molding, a silicone foam layer bonded to said accessory device and parts and opposing surfaces of the body portion, Ri Tona The said
The reconform layer forms the urethane foam
It is placed in a molding die, and as the urethane foam solidifies,
Is bonded to the main body part
It is characterized by having been done. And billing
The soundproofing spacer for an engine according to the invention described in the item 2 is claimed.
Item 1. The invention according to Item 1, wherein the silicon foam layer comprises:
An engagement recess which engages with the main body when the main body is formed;
Characterized by having at least one of the engaging projections
It is.

[0007]

According to the first aspect of the present invention, there is provided a soundproofing space for an engine.
Is polyurethane foam formed by foam molding?
And a silicon foil bonded to one side of the body
A silicon foam layer and a main body.
When forming the urethane foam of the main body,
A silicone foam layer is placed in the mold,
When the joint surface is fixed as the
Are joined. The soundproofing spacer for engine of the present invention thus manufactured includes a silicon foam layer disposed in close proximity to the engine main body and particularly disposed to face a high-temperature accessory device or component. Because of this, the heat resistance becomes good. In addition, since the main body, which is the main component of the soundproof spacer, is made of relatively inexpensive urethane foam, the cost can be reduced. The engine according to claim 2
Soundproof spacer foams urethane foam in the main body
When forming by molding,
At least one of the engaged concave and convex portions.
The reconform layer and the main body are engaged. This
Silicon foam layer and book with relatively high release properties
The body part is firmly connected.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an engine soundproof spacer according to the present embodiment, and FIG. 2 is a cross-sectional view of a portion corresponding to line II-II in FIG. As shown in FIGS. 1 and 2, the engine soundproofing spacer of this embodiment includes a main body 1 made of urethane foam and a silicon foam layer 2 bonded to one surface of the main body 1, and is disposed. It is formed in a sheet-like predetermined shape corresponding to the shape of the gap to be formed.

The main body 1 is made of urethane foam formed by foaming urethane into a predetermined shape having a density of 0.1 g / cm ³ and a thickness T of 25 mm. The surface of the main body 1 facing the engine main body has a groove 11 corresponding to the shape of a rib or the like formed on the outer surface of the engine main body.
Are formed. The silicon foam layer 2 is formed of a silicon foam formed by foaming silicon into a sheet having a density of 0.4 g / cm ³ and a thickness t of 5 mm. Etc. are partially provided on a surface facing a member which becomes high in temperature. The silicon foam layer 2 is arranged in a mold when the urethane foam of the main body 1 is formed, and is bonded to the main body 1 by fixing the bonding surface as the urethane foam solidifies. Further, on the joint surface of the silicon foam layer 2, an engagement recess 21 and an engagement projection 22 having a T-shaped cross section are provided at many places.
1 and the engaging projection 22 are engaged with the main body 1 when the main body 1 is formed.

The soundproof spacer for an engine is manufactured as follows. First, a silicone foam material in which a foaming agent or the like is blended with silicon is charged into a foaming mold for forming the silicone foam layer 2 and foamed.
The silicon foam layer 2 having a predetermined shape having the engaging concave portions 21 and the engaging convex portions 22 is manufactured. Next, the silicon foam layer 2 is placed at a predetermined position in the foaming mold for forming the main body 1.
Is placed, a urethane foam material in which a foaming agent or the like is mixed with urethane is charged into a foaming mold and foamed. Thereby, the engagement concave portion 21 of the silicone foam layer 2 and the engagement
Joined to the silicon foam layer 2 while engaging with the projection 22
The urethane foam (the main body 1) is formed, and the above-described engine soundproof spacer is completed.

As shown in FIGS. 3 and 4, the engine soundproof spacer of the present embodiment constructed as described above has an engine body 5 and an engine case cover 6 disposed close to the engine body 5. Are disposed in a gap formed between the two. In this case, since the engine case cover 6 is heated by the exhaust pipe 7 disposed in the vicinity thereof and becomes high temperature, the silicon foam layer 2 is disposed so as to face the engine case cover 6. Thereby, the heat resistance of the soundproof spacer with respect to the engine case cover 6 at which the temperature becomes high is secured.

The standing wave generated in the gap during operation of the engine is absorbed by the main body 1 and the silicon foam layer 2 and is effectively attenuated, thereby reducing engine noise. As described above, according to the engine soundproof spacer of the present embodiment, since the silicon foam layer 2 is disposed to face the high temperature engine case cover 6 and the like, the heatproof spacer is excellent in heat resistance. The main body 1 is
Since it is made of relatively inexpensive urethane foam, the cost can be reduced, so that both heat resistance and cost reduction can be achieved.

The silicon foam layer 2 is provided on the main body 1.
Has the engaging concave portion 21 and the engaging convex portion 22 which are engaged with the main body 1 at the time of forming, so that the bonding state between the silicon foam layer 2 having relatively high releasability and the main body 1 can be strengthened. it can. In the engine soundproofing spacer of this embodiment, the silicon foam layer 2 and the main body 1 are engaged with each other by the engaging concave portions 21 and the engaging convex portions 22 formed in the silicon foam layer 2. 5, a silicon foam layer 4 having an appropriate number of through-holes 41 formed at the peripheral end is attached so that the peripheral end is buried in the main body portion 3, and is inserted into the through-hole 41. By injecting the urethane foam of the main body 3, the silicon foam layer 4 and the main body 3 can be engaged.

In this embodiment, the engaging projections 22 provided on the silicone foam layer 2 are formed integrally with the silicone foam layer 2 by silicone foam. An engagement projection can be provided by driving an umbrella-shaped clip or the like into the boss.

[0015]

According to the sound insulating spacer for an engine according to the first aspect of the present invention, there is provided a main body made of urethane foam formed by foam molding , and an accessory device which has a high temperature of the main body. Ri Do from the part opposite the silicone foam layer bonded to the surface, the silicon foam layer, urethane follower
Urethane foam placed in the mold that forms
The solidified surface of the main body
Since it is joined to the substrate, the heat resistance is excellent and the cost can be reduced. And in the invention of claim 2,
According to such an engine soundproof spacer, the silicon foam
The memory layer is provided with an engagement recess which engages with the main body when the main body is formed.
Relatively high because it has at least one of
Combined state of silicone foam layer with release properties and main body
You can strengthen your condition.

[Brief description of the drawings]

FIG. 1 is a plan view of a soundproof spacer for an engine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a portion corresponding to line II-II in FIG.

FIG. 3 is a side view partially showing a mounting state of the engine soundproof spacer according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an attached state of the engine soundproof spacer according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an attached state of an engine soundproof spacer according to another embodiment of the present invention.

[Explanation of symbols]

1, 3, body part 2, 4, urethane foam layer 1
DESCRIPTION OF SYMBOLS 1 ... Groove part 21 ... Engagement concave part 22 ... Engagement convex part 41 ... Through-hole

Claims (2)

(57) [Claims] 1. A soundproof spacer for an engine which is disposed in a gap formed between an engine main body and an accessory device or a component disposed close to the engine main body and prevents noise generated in the gap. there are a main body made of urethane foam which is formed by foam molding, a silicone foam layer bonded to said accessory device and parts and opposing surfaces of the body portion, Ri Tona, the silicone
The foam layer is formed by forming the urethane foam.
Placed in the mold, with the solidification of the urethane foam
The joint surface is fixed to the main body by being fixed.
A soundproofing spacer for an engine, comprising: 2. The silicon foam layer according to claim 1, wherein
Of the engaging concave portion and the engaging convex portion engaging with the main body portion at the time of forming.
2. The device according to claim 1, wherein the device has at least one.
Engine soundproof spacer.