JP2563058Y2 - Engine sound insulation cover - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulating cover for an engine for reducing noise from an engine mounted on an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, in an engine of an automobile or the like, a cylinder block vibrates in a vertical direction and a horizontal direction due to an exciting force generated by an explosion in a cylinder or rotation of a crankshaft. And this vibration passes through the cylinder head and the cylinder head cover (hereinafter referred to as rocker cover).
And the like, and vibrates to generate noise.

For this reason, various techniques have conventionally been used to reduce the noise generated by the engine. For example, as shown in Japanese Patent Application Laid-Open No. 55-140709, a sound insulation cover for covering the front of the engine is known. In some cases, the sound emission to the outside of the vehicle is reduced. In some cases, a hood insulator is mounted on the inner surface of the engine hood to reduce noise emitted outside the vehicle.

[0004]

However, in these conventional sound insulation devices, since the sound insulation cover or the hood insulator is provided on the vehicle side on which the engine is mounted, only a part of the sound emission is reduced. Cannot improve the sound insulation efficiency. In particular, there is a possibility that it can not effectively insulate sound emission from large lot Kaka bar above the sound emission contribution ratio of the engine.

[0005] In view of the above-mentioned conventional circumstances , the present invention aims at efficiently reducing engine noise by arranging a sound insulation cover of the engine close to the engine body. And

[0006]

According to the present invention, a sound insulating cover of an engine includes a ceiling wall covering an upper part of the engine, and a side wall connected to the ceiling wall. A lower end portion is formed to extend to a lower side near a joint between the cylinder head and the cylinder head cover of the engine.
With that, the inner portion of the sidewall is to have the joint side and a predetermined gap, and configured to arrange close to the engine body.

[0007]

In this configuration, the sound insulation cover of the engine is arranged close to the engine body, so that the sound insulation cover is arranged close to the engine that is the noise source, thereby reducing the noise emitted from the engine. Efficient reduction and downsizing can be achieved.

[0008] Further, as the source of noise of the engine, the sound emitted from above the cylinder head cover (rocker cover), which is the largest, is blocked by a ceiling wall that covers the upper part of the engine, and the lower end of the side wall is closed by the cylinder of the engine. Below the joint near the head and cylinder head cover
Side and the inner side of the side wall is arranged close to the engine body so as to have a predetermined gap with the joint side, so that noise leaking from the gap between the sound insulating cover and the engine is reduced. co When a radiation solid angle can be narrowed limit
Since the noise emission direction can be directed downward , the sound insulation effect can be greatly improved, and at the same time, heat can be prevented from being trapped in the gap between the sound insulation cover and the engine.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a V-type engine 1 according to the present invention. Fuel is supplied to the V-type engine 1 from a fuel pump (not shown) via a fuel main gallery 2.
Here, the fuel main gallery 2 branches into a first gallery 11 and a second gallery 12 at a bank 8 between the rocker covers 6, 7 placed above the respective cylinder heads 4, 5. When the V-type engine 1 is mounted on the vehicle, the first gallery 11 has a cylinder fuel injection valve 13 disposed on the cylinder head 4 located on the front side of the vehicle (arrow F in the drawing).
The second gallery 12 is provided with a fuel injection valve 14 of a cylinder disposed on the cylinder head 5 located on the rear side of the vehicle when mounted on the vehicle. The fuel main gallery 2, the first gallery 11, and the second gallery 12
Further, a fuel supply device is constituted by the fuel injection valves 13, 14, and the like. The V-type engine 1 according to this embodiment has an intake collector 10 disposed above the cylinder head 5 located on the rear side of the vehicle and protruding laterally from the rocker cover 7 of the cylinder head 5. 9 supplies air.

FIG. 2 shows a configuration according to the present invention.
As shown in FIG. 4, an engine cover 70 is provided to cover the rocker cover 6 of the cylinder head 4 located on the vehicle front side and the rocker cover 7 of the bank of the cylinder head 5 located on the vehicle rear side. The engine cover 70
Outer surface 71 made of heat-resistant synthetic resin and inner surface made of sound absorbing material
72, which are fixed to bolts 25 and 26 in fastening ports 23 and 24 provided in the intake manifold 9, the intake collector 10 and the like disposed above the rocker cover 6 and the rocker cover 7.

The engine cover 70 is provided with a ceiling wall 70a that covers an upper part of the main body of the V-type engine 1, and a valve mechanism (not shown) of the V-type engine 1 disposed continuously with the ceiling wall 70a. A side wall 70b formed on the engine front side surface, a side wall 70d formed on the engine rear side surface, and covers the side surface of the rocker cover 6 of the bank on the vehicle front side when the V-type engine 1 is mounted on the vehicle. Side wall 70c and the V-type engine 1
And a side wall 70e that covers the side surface of the rocker cover 7 of the bank on the vehicle rear side when the vehicle is mounted on the vehicle.
The ceiling wall 70a and the side walls 70b, 70c, 70d, and 70e are respectively connected and integrally formed in a concave shape.

In the following description, the symbol "b" indicates that the valve mechanism (not shown) of the V-type engine 1 is located on the engine front side, and similarly, "c", "d" and "e" are the same. , Respectively, on the bank side located on the left side with respect to the engine front side b, on the engine rear side of the V-type engine 1 and on the bank side located on the right side with respect to the engine front side b. I have. Further, in the present embodiment, the V-type engine 1 is configured such that the bank side rocker cover 6 located on the left side with respect to the engine front side b is located on the vehicle front side when mounted on the vehicle. Will be arranged.

Further, the side walls 70b, 70c, 70d and 70
e, when the engine cover 70 is disposed on the V-type engine 1, each end 73 of the side walls 70b, 70c, 70d and 70e.
b, 73c, 73d and 73e are located below the flanges 15 and 16 supporting the rocker covers 6 and 7, and the side wall 70d has an intake pipe 17 communicating with the intake collector 10. Is provided with a notch portion 77 into which is inserted. In addition, ceiling wall 70a, side walls 70b, 70c, 70d and 70e
Are integrally formed in a size to surround the intake collector 10 protruding laterally from the flange portions 15 and 16 and the rocker cover 7.

In the present embodiment, the flange portions 15 and 16 supporting the rocker covers 6 and 7 have the following configuration. That is, as shown in FIG. 5 to FIG.
b, 16b, the flange outer edges 15g, 16g are formed linearly, and the bosses 15h, 16h to which the bolts 18 for fastening the rocker covers 6 and 7 are fastened are the flanges 15h, 16b.
And 16 only protrude inside.

On the other hand, the other flange 15 of the rocker cover 6
As in the prior art, only the bosses 15h and 16h have the flanges 15 and 16 at the flange 15f between the banks 8c and 15d and the bank 8 and the flange 16f between the other flanges 16d and 16e of the rocker cover 7 and the bank 8. Are formed to protrude inward and outward. Further, in the present embodiment, the engine cover 70
A small gap 75b is provided between the side wall 70b and the flange outer edges 15g, 16g.
On the e side, the intake collector 10 is disposed so as to protrude from the flange portion 16e. In addition, the side walls 70b and 70e
Since the end portions 73b and 73e are located below the flange portions 15 and 16, they are arranged so as to have a small gap 75e between the end portions 73b and 73e and the intake collector 10. Here, the ceiling wall 70a and the side walls 70b, 70c, 70d, and 70e are integrally formed to have a size surrounding the flange portions 15, 16 and the intake collector 10 protruding laterally from the rocker cover 7, so that the side wall is formed. A gap 75c is formed between the flange 70c and the flange 15;
A gap 75d is formed between d and 16d.

When the V-type engine 1 with the above-described engine cover 70 is mounted on the vehicle 41, as shown in FIG. 9, the rocker cover 6 is mounted so that the rocker cover 6 is located on the front side of the vehicle. In the present embodiment,
As shown in FIG. 10, each end 73 of the engine cover 70
The b, 73c, 73d and 73e are mounted below the vehicle side wall panel 43 which covers the engine room 42. In addition, 44 represents a food.

Next, the operation according to this embodiment will be described. In this configuration, by fixing the engine cover 70 to the rocker cover 6, the intake manifold 9, and the intake collector 10, respectively, the engine cover 70 is held close to the main body of the V-type engine 1, and the engine as the sound insulation cover is held. V-type engine 1 with cover 70 as noise source
Since it is arranged close to the main body, the emission noise of the V-type engine 1 can be efficiently reduced, and the size can be reduced.

The engine cover 70 includes a ceiling wall 70a,
The side walls 70b, 70c, 70d and 70e are respectively connected,
The flange portion of the V-type engine 1 is integrally formed in a concave shape.
15 and 16 and the intake collector 10 and at each end 73
Since b, 73c, 73d, and 73e are configured to have a length located below the flange portions 15 and 16, the V-type engine 1 emits noise from above the rocker covers 6 and 7, which is the largest source of noise. The sound is transmitted to the ceiling wall 70a, the side wall 70b,
70c, 70d, and 70e enable sound insulation. Further, since the side walls 70b, 70c, 70d, and 70e are each formed continuously and integrally with the four side surfaces in a concave shape, the sound emission is less likely to escape from the side walls 70b, 70c, 70d, and 70e, and the sound insulation effect is reduced. As a result, sound emission can be prevented efficiently.

Further, in the present embodiment, the flange outer edges 15g and 16g are formed in a straight line, and the outer edges 15g and 16g and the side wall 70b of the engine cover 70 are close to each other via a small gap 75b. The outside of the collector 10 is also formed linearly, and the side wall 70e and the intake collector 10 are close to each other via a small gap 75e. Therefore, the side of the side wall 70b formed on the side of the engine front side where the valve mechanism of the V-type engine 1 as a noise generating source is disposed, and the driver side when the V-type engine 1 is mounted on the vehicle 41. On the rear side of the vehicle, it is possible to more reliably prevent noise from leaking, and the quietness in the vehicle interior has been significantly improved,
This will lead to improved product appeal.

The engine cover 70 includes a ceiling wall 70a,
The side walls 70b, 70c, 70d, and 70e are the flanges 15, 16,
And an intake collector 10 protruding laterally from the rocker cover 7.
Are formed integrally in such a size as to enclose the gap 75c and the gap 75d even when a manufacturing error occurs at the time of resin molding manufacturing, so that the gap 75c and the gap 75d are provided.
Accordingly, the error is absorbed, and there is no fear that the engine cover 70 and the engine may interfere with each other, which leads to a reduction in the manufacturing cost in the manufacturing process. In addition, the engine cover 70 and the engine
It is also possible to suppress the heat from being trapped in the gaps. Also,
The gap 75c and the gap 75d are open downward.
Therefore, for example, the direction of noise emission (progress) is directed downward.
The gap between the engine cover 70 and the engine.
Even if heat is kept in between, it leaks directly to the hood 44
Sound can be reduced, and the inner
Effectively silenced by under 45 and outer fender 46
It is possible to do.

In the present embodiment, the flange portions 15b and 16b corresponding to the side surfaces of the engine front side are:
The flange outer edges 15g and 16g are formed linearly, and the flanges 15c, 15d and 15f and 16c, 16d and 16f are formed by projecting the bosses 15h and 16h inward and outward as in the prior art. On the side where the valve mechanism as a noise generating source is disposed, the gap 75b is reduced to reduce noise and to minimize the weight increase due to the thick flange portion. Thus, noise reduction and weight increase suppression are moderately achieved.

Each end 73b, 73 of the engine cover 70
By mounting so that c, 73d, and 73e are located below the vehicle side wall panel 43 that covers the engine room 42, a slight emission sound leaking from the ends 73b, 73c, 73d, and 73e is reduced by the inner fender 45. The sound insulation wall structure of the double structure constituted by the outer fender 46 and the outer fender 46 provides relatively sound insulation. That is, almost no noise is transmitted to the single steel plate hood 44 by the action of the engine cover 70, so that noise outside the vehicle can be more effectively reduced.

[0023]

[Effect of the invention] As described above, according to the invention,
The sound insulation cover of the engine includes a ceiling wall that covers an upper part of the engine, and a side wall connected to the ceiling wall, and a lower end of the side wall is formed near a joint between the cylinder head and the cylinder head cover of the engine . Extending down to the bottom
With that, as the inner portion of the side wall has the joint side and a predetermined gap, since the structure is arranged in proximity to the engine body, the heat that the molar basket into the gap between the sound insulation cover and the engine The radiation solid angle of noise leaking from the gap between the sound insulation cover and the engine can be restricted to a small value while suppressing noise.
It is possible to direct the discharge direction downward, it is possible to greatly improve the sound insulation effect, yet compact-
There is an effect that cost can be reduced at the same time .

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a V-type engine according to an embodiment of the present invention.

FIG. 2 is a side view of the engine cover according to the embodiment of the present invention;

FIG. 3 is a schematic side view of the V-type engine with the cover according to the embodiment mounted thereon.

FIG. 4 is a schematic perspective view of a V-type engine with the cover according to the embodiment mounted thereon.

FIG. 5 is a top view of the rocker cover and the engine cover in the embodiment.

FIG. 6 is an enlarged view of a portion F in FIG.

FIG. 7 is an enlarged view of a portion G in FIG.

FIG. 8 is a schematic cross-sectional view taken along line AA in FIGS. 6 and 7.

FIG. 9 is a partial plan view showing a state in which a V-type engine with a cover according to an embodiment of the present invention is mounted on a vehicle.

FIG. 10 is a partial cross-sectional view illustrating a state in which a V-type engine with a cover mounted thereon according to an embodiment of the present invention is mounted on a vehicle.

[Explanation of symbols]

 1 V-type engine 4 Cylinder head 5 Cylinder head 6 Rocker cover 7 Rocker cover 10 Inlet collector 15 Flange 15b Flange corresponding to engine front side 15g Flange outer rim 16 Flange 16b Flange corresponding to engine front side 16g Flange outer edge 70 Engine cover 70a Ceiling wall 70b Side wall 70c Side wall 70d Side wall 70e Side wall 75b Gap 75c Gap 75d Gap 75e Gap

Claims (1)

(57) [Scope of request for utility model registration] 1. A sound insulation cover for an engine, comprising: a ceiling wall covering an upper part of an engine; and a side wall connected to the ceiling wall, wherein a lower end of the side wall is provided with a cylinder head of the engine. The cylinder head cover is formed so as to extend to a lower side near the joint, and is disposed close to the engine body such that an inner portion of the side wall has a predetermined gap with the joint portion side. Sound insulation cover for the engine.