JP2003254158A - Engine structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine structure capable of suppressing transmission of the engine noises into a car cabin using a lesser number of component parts without requiring complicated mounting operations, etc. <P>SOLUTION: The engine structure for car of horizontally laid type with its cylinder head covered with a head cover includes a sound shutoff cover 30 mounted on the head cover 10 and covering its side nearer the car cabin, wherein the shutoff cover is formed from a vertical wall 31 and an upper wall 32 so that it shows an approximately L-form section, and an engagement part 21 to engage the bottom of the shutoff cover vertical wall is formed at the bottom of the head cover rear surface, while the head cover oversurface 12 is furnished with projections 23 and 24 to be engaged with openings 33 and 34 formed in the shutoff cover upper wall, whereby the shutoff cover is attached to the head cover through such procedures that the bottom of the shutoff cover vertical wall is engaged with the engagement part of the head cover rear surface and the openings in the upper wall are engaged with the projections on the head cover oversurface. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile engine structure in which an engine is laterally arranged in an engine room and at least a part of a cylinder head of the engine is covered with a cylinder head cover.

[0002]

2. Description of the Related Art As is well known, there is a so-called front engine-front drive system (FF system) vehicle in which an engine is mounted on a front portion of a vehicle to drive front wheels, and the engine is installed horizontally. In this case, the engine
In the engine room at the front of the vehicle, the cylinder rows are laid out so as to extend substantially along the vehicle width direction.

Noise generated by the engine mounted in the engine room at the front of the vehicle (engine noise)
Occupies a large weight in the vehicle interior noise detected by passengers in the vehicle interior. Therefore, in order to reduce the vehicle interior noise, it is very important to suppress the transmission of engine noise into the vehicle interior. In particular, in the case of the horizontal engine type described above, the area of the engine facing the passenger compartment is wider than in the vertical engine type, and the engine may be arranged closer to the passenger compartment as a whole. Since it is possible, suppression of transmission of engine noise to the vehicle interior becomes more important.

As is well known, in an automobile engine, at least an upper part of a cylinder head is usually covered with a cover body (cylinder head cover: hereinafter referred to as a head cover), but this head cover is sufficient. It is impossible to expect a sound insulation effect. In other words, the attachment of the head cover is not sufficient to effectively suppress the transmission of engine noise into the vehicle interior.

Regarding suppression of transmission of such engine noise,
Although not particularly conscious of a horizontal type engine, for example, in Japanese Unexamined Patent Publication No. 5-306651, a rocker cover attached to a cylinder head so as to cover a valve mechanism is provided on the outer surface around the opening. A belt-shaped vibration damping member is attached so as to surround the opening, a shielding member is provided to cover the outer surface of the rocker cover, and the shielding member is plastically deformed so as to sandwich the belt-shaped vibration damping member. It is disclosed.

[0006]

However, in this prior art, a belt-shaped vibration damping member, which is separate from the shielding member, is attached to a required portion of the rocker cover on the outer surface around the opening of the rocker cover having a complicated shape. Since it has to be kept, the number of parts is large and it is difficult to mount.

Therefore, the present invention provides an engine structure for an automobile which can effectively suppress the transmission of engine noise into the vehicle compartment with a smaller number of parts and without requiring complicated installation work. It was made for the purpose.

[0008]

Therefore, the first aspect of the present invention is as follows.
According to another aspect of the present invention (hereinafter referred to as the first invention), an engine structure for an automobile is provided in the engine room such that the cylinder row extends substantially along the vehicle width direction, and at least a part of the cylinder head is a head cover. Based on the engine structure of an automobile covered with the above, there is provided a sound insulating cover which is attached to the head cover and covers the side of the head cover closer to the vehicle compartment. The sound insulation cover has a vertical wall portion that is substantially along the rear surface portion of the head cover that faces the passenger compartment side, and an upper wall portion that is connected to the vertical wall portion and that is substantially along the upper surface portion of the head cover. Is formed in. And, on the lower end side of the head cover rear surface portion, a locking portion for locking the lower end portion of the sound insulating cover vertical wall portion that is inserted from substantially above is provided, while on the head cover upper surface portion, the sound insulating cover above which is covered from approximately above is provided. The sound insulation cover is provided with an engagement portion that engages with the opening formed in the wall portion, and the lower end of the vertical wall portion of the sound insulation cover is engaged with the engagement portion of the rear surface portion of the head cover and the upper wall The opening of the portion is attached to the head cover by engaging with the above-mentioned engaging portion on the upper surface of the head cover.

The invention according to claim 2 of the present application (hereinafter,
In a second invention), in the first invention, further, a panel body is disposed above substantially the entire head cover and above an upper wall portion of the sound insulation cover, and a rear surface side of the panel body is provided. A sound insulation material is fixed to at least a predetermined area, a terminal portion of an upper wall portion of the sound insulation cover is bent upward, and the bent portion is in contact with the sound insulation material of the panel body. It was done.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view of a head cover and a sound insulation cover of an automobile engine according to the present embodiment, FIG. 2 is a plan view of the head cover, FIG. 3 is a cross-sectional view taken along the line Y3-Y3 of FIG. FIG. 4 is a cross-sectional explanatory view taken along the line Y4-Y4 of FIG. The automobile according to the present embodiment is of a so-called FF type, and its engine is a so-called "horizontal-installation" type diesel engine. The engine compartment is arranged so that the cylinder row extends substantially along the vehicle width direction. Is disposed inside.

The head cover 10 covers at least a part (upper part) of a cylinder head of such an engine, and a fuel injection valve (not shown) is provided on an upper surface part 12 thereof corresponding to a cylinder row of the engine. Insertion hole 1 for insertion
2h are arranged side by side in series along the longitudinal direction.

As shown in FIGS. 1 and 4, in the present embodiment, the side of the head cover 10 closer to the passenger compartment, that is,
A sound insulation cover 30 covers a rear surface portion 11 of the head cover 10 that faces the passenger compartment and a rear portion of the upper surface portion 12 that is connected to the rear surface portion 11. In order to ensure the required rigidity, the sound insulation cover 30 is obtained, for example, by compressing and pressing a synthetic resin base material, and is attached to the head cover 10 by the method described later.

The sound insulation cover 30 has a vertical wall portion 31 which is substantially along the rear surface portion 11 of the head cover 10 in an attached state, and an upper portion which is connected to the vertical wall portion 31 and is substantially along the upper surface portion 12 of the head cover 10 in an attached state. The wall portion 32 and the wall portion 32 are formed into a substantially L-shaped cross section. The vertical wall portion 31 of the sound insulating cover 30 covers substantially the entire surface of the head cover rear surface portion 11, and the upper wall portion 32 covers the rear portion of the head cover upper surface portion 12.

A timing case portion 18 corresponding to a belt case of an engine timing belt (not shown) is formed at a relatively rear portion of a side end portion of the head cover 10 in the vehicle width direction, and in the vicinity thereof. A cylindrical portion 14 for a filler, which is closed by the fuel cap 3 (see FIG. 4) and to which the seal rubber 4 is attached, is provided. Furthermore,
A pipe recess 15 for connecting the breather pipe 5 (see FIG. 5, which will be described later) is provided in the center of the upper surface of the rear portion of the head cover 10 in the vehicle width direction.
A connection pipe 16 (see FIGS. 2 and 3) is attached to the device 5. The sound insulating cover 30 is formed by cutting out portions corresponding to these in order to avoid interference with the pipe recess 15 and the cylindrical portion 14.

On the lower end side of the rear surface portion 11 of the head cover 10, a plurality of (three in this embodiment) locking portions 21 for locking the lower end portion of the vertical wall portion 31 of the sound insulating cover 30 are provided. There is. As can be seen from FIGS. 3 and 4, each locking portion 21 is formed in a groove shape that opens upward.
Further, on the upper surface portion 12 of the head cover 10, as an engaging portion that engages with the openings 33 and 34 formed in the upper wall portion 32 of the sound insulation cover 30, the protruding piece portion 2 that projects upward is provided.
3, 24 are provided.

When the sound insulation cover 30 is attached to the head cover 10, the insertion piece portion 31a formed at the lower end portion of the sound insulation cover vertical wall portion 31 is formed into a groove-like shape formed at the lower end side of the head cover rear surface portion 11. The sound insulation cover upper wall portion 32 is engaged with the engagement portion 21 by inserting the sound insulation cover from above, and the opening portions 33 and 34 of the sound insulation cover upper wall portion 32 are formed on the head cover upper surface portion 12. And 24
Are attached so as to be respectively engaged with the above. Thus, the sound insulation cover 30
Has a lower end portion of the vertical wall portion 31 at the rear surface portion 11 of the head cover.
Of the protrusion-shaped portion 2 of the head cover upper surface portion 12 and the opening portions 33 and 34 of the upper wall portion 32 are engaged with the respective groove-shaped engaging portions 21 of
The head cover 10 is attached by engaging the respective parts 3 and 24 so as to be inserted therethrough.

As described above, the engine head cover 1
The side close to the passenger compartment of 0 is covered with a sound insulating cover 30 formed in a substantially L-shaped cross section by a vertical wall portion 31 substantially along the head cover rear surface portion 11 and an upper wall portion 32 substantially along the head cover upper surface portion 12. As a result, the transmission of engine noise into the vehicle interior can be effectively suppressed.

In this case, the sound insulation cover 30
The lower end portion of the vertical wall portion 31 to the head cover rear surface portion 11
Of the head cover upper surface portion 12 is covered with the upper wall portion 32 from the substantially upper side, and the openings 33 and 34 are formed in the projecting piece portions 23 and 24 of the head cover upper surface portion 12. It is attached to the head cover 10 by being inserted into and engaged with. In this attached state, the sound insulation cover 10 will not come off from the head cover 10 unless it is removed so as to be pulled out upward.
That is, no member for fastening and fixing such as screws and bolts is required for mounting the sound insulation cover 30, and moreover, the sound insulation cover 30 can be securely held by the head cover 10 by a simple assembling work.

When the seal rubber 4 is mounted on the outer peripheral portion of the cylindrical portion 14 to which the fuel cap 3 (see FIG. 4) is attached, it is more preferable that the inner peripheral base portion 4a of the seal rubber 4 is of the cylindrical portion 14. It is set to be fitted and fixed to the outer peripheral portion with a predetermined tightening margin. On the other hand, at a portion of the upper wall portion 32 of the sound insulation cover 30 corresponding to the peripheral edge of the cylindrical portion 14, a holding portion 32a having a slightly thin plate thickness is set.
Are formed.

The seal rubber 4 presses the pressing portion 32a of the sound insulating cover upper wall portion 32 from the upper side with the inner peripheral base portion 4a, and the inner peripheral base portion 4a of the cylindrical portion 14 as described above. The cylindrical portion 14 is mounted so as to cover the outer peripheral side by being fitted and fixed to the outer peripheral portion with a predetermined interference. Thereby, the upper wall portion 32 of the sound insulation cover 30 is more reliably supported on the upper surface portion 12 of the head cover 10 without rattling, and the sound insulation cover 3
The wearing state of 0 can be better maintained.

In the present embodiment, as shown by a chain double-dashed line curve in FIG. 5, a cover body 40 (decorative cover) is provided above substantially the entire head cover 10 and above the upper wall portion 32 of the sound insulating cover 30. Is provided. That is, the decorative cover 40 covers substantially the entire upper portion of the head cover 10 to which the sound insulating cover 30 is attached. The decorative cover 40 is basically intended to improve the appearance of the engine upper surface area in the engine room. However, in the present embodiment, the decorative cover 40 is also used to improve the engine noise. The transmission of the vehicle to the passenger compartment is suppressed.

FIG. 6 shows the bottom surface (back surface) of the decorative cover 40.
FIG. 7 is a bottom view seen from the side, FIG. 7 is a cross-sectional explanatory view of the decorative cover 40 taken along line Y7-Y7 of FIG. 6, and FIG. 8 is Y8 of FIG.
-A cross-sectional explanatory view of the decorative cover 40 taken along line Y8,
FIG. 9 shows the makeup cover 4 as seen from the direction of the arrow Y9 in FIG.
It is an enlarged arrow view of 0. As shown in these figures, the decorative cover 40 includes a cover panel 41 formed of, for example, a synthetic resin in a plate shape, and a sound insulating material as a sound insulating material arranged in a required area on the back surface side of the cover panel 41. The sound insulating material layer 42 is fixed to the back surface side of the cover panel 41 by using, for example, an adhesive. The sound insulating material layer 42 may be provided on the entire back surface of the cover panel 41.

The decorative cover 40 is provided with a plurality of insertion holes 43 for inserting screw members (not shown). The decorative cover 40 is positioned with respect to the head cover 10, and then the screw members are inserted. The decorative cover 40 is fixed to the head cover 10 by inserting it through the hole 43 and screwing it in. As you can see from Figure 5,
The sound insulating material layer 42 is provided in a region corresponding to at least a main portion of the head cover 10 in order to effectively suppress the emission of engine noise from above.

As described above, the decorative cover 4 having the sound insulating material layer 42 fixed to the back surface is provided above substantially the entire head cover 10.
By covering with 0, the decorative cover 40 originally provided for the purpose of improving the appearance is effectively used to effectively suppress the engine noise from being dissipated from above and to transmit the engine noise to the vehicle interior. It can be suppressed more effectively.

In the present embodiment, the rising portion 35 is formed by bending the terminal side (front end side) of the upper wall portion 32 of the sound insulating cover 30 so as to rise upward at a substantially right angle. Then, when the decorative cover 40 is attached to the head cover 10, as shown in FIG. 10, for example, the rising portion 35 causes the sound insulating material layer 4 of the decorative cover 40 to move.
It is designed so as to bite into 2 and to abut. Accordingly, the decorative cover 4 has a very simple configuration in which the terminal side of the upper wall portion 32 of the sound insulation cover 30 is simply bent upward.
It is possible to eliminate the gap between the sound insulation material layer 42 of 0 and the sound insulation cover upper wall portion 32, and a higher sound insulation effect can be obtained.

Also, at the portion corresponding to the timing case 18 of the head cover 10 on one end side in the vehicle width direction of the decorative cover 40, as can be seen clearly from FIGS. 8 and 9, the sound insulating material provided on the back surface side thereof. An extension portion 42 a that hangs downward is provided at a side edge portion of the layer 42. This extension 42 a is provided on the cover panel 41 of the decorative cover 40.
The length is set so as to project downward by a predetermined amount Hc from the lower end of the side wall portion 41w.

The makeup cover 40 is attached to the head cover 1
When it is attached to 0, for example, as shown in FIG. 11, the extension portion 42a acts so as to fill a gap between the upper portion of the timing case 18 and the decorative cover side wall portion 41w. By adopting this configuration,
Dispersion of engine noise from above or from the side can be effectively suppressed, and transmission of engine noise into the vehicle interior can be suppressed more effectively.

The present invention is not limited to the above-mentioned embodiments, and within the scope of the present invention,
It goes without saying that various improvements and design changes are possible.

[0029]

According to the first invention of the present application, the side of the head cover of the engine closer to the passenger compartment is the vertical wall portion substantially along the rear surface portion of the head cover and the upper wall portion substantially along the upper surface portion of the head cover. By being covered with the sound insulation cover having a substantially L-shaped cross section, transmission of engine noise into the vehicle interior can be effectively suppressed. In this case, the sound insulation cover is locked by inserting the lower end portion of the vertical wall portion into the locking portion of the head cover rear surface portion from substantially above, and covering the upper wall portion with the head cover upper surface portion from substantially above. The opening is attached to the head cover by engaging with the engaging portion on the upper surface of the head cover. That is, no members for fastening and fixing such as screws and bolts are needed, and the sound insulation cover can be reliably held by the head cover by a simple assembling work.

Further, according to the second invention of the present application, basically, the same effect as that of the first invention can be obtained. Particularly, by covering the substantially entire upper part of the head cover with a panel body having a sound insulating material fixed to the back surface, the emission of engine noise from above is effectively suppressed, and the transmission to the vehicle interior is more effectively performed. Can be suppressed. Moreover,
Since the terminal portion of the upper wall of the sound insulating cover is bent upward and the bent portion is in contact with the sound insulating material of the panel body, the gap between the sound insulating material and the upper wall of the sound insulating cover is simple. Can be eliminated, and a higher sound insulation effect can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a head cover and a sound insulating cover of an automobile engine according to an embodiment of the present invention.

FIG. 2 is a plan view of the head cover.

3 is a cross-sectional explanatory view of the head cover taken along line Y3-Y3 of FIG.

4 is a cross-sectional explanatory view of the head cover and the sound insulation cover taken along line Y4-Y4 of FIG.

FIG. 5 is a plan view of the head cover, the sound insulating cover, and the decorative cover.

FIG. 6 is a bottom view of the decorative cover.

7 is a cross-sectional explanatory view of the decorative cover taken along line Y7-Y7 of FIG.

8 is a cross-sectional explanatory view of the decorative cover taken along line Y8-Y8 of FIG.

FIG. 9 is an enlarged arrow view of the decorative cover seen from the direction of the arrow Y9 in FIG.

FIG. 10 is a partial cross-sectional explanatory view showing an attached state of the decorative cover.

FIG. 11 is a side view showing the attached state of the decorative cover.

[Explanation of symbols]

10 ... Head cover 11 ... Rear surface of head cover 12 ... Head cover upper surface 21 ... Locking part 23, 24 ... Projection piece 30 ... Sound insulation cover 31 ... Vertical wall of sound insulation cover 32 ... Sound insulation cover upper wall 33, 34 ... Opening 35 ... Startup section 40 ... Makeup cover 41 ... Cover panel 42 ... Sound insulation layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takuji Sasada             3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda             Within the corporation F term (reference) 3G024 AA72 DA18 EA05 EA07 FA05                       FA14 GA00

Claims (2)

[Claims] 1. An automobile engine structure in which a cylinder row is arranged in an engine room so as to extend substantially in a vehicle width direction, and at least a part of a cylinder head is covered with a head cover. A sound insulation cover attached to the head cover and covering a side of the head cover closer to the vehicle compartment is provided. The sound insulation cover includes a vertical wall portion substantially along a rear surface portion of the head cover facing the vehicle interior side and the vertical wall portion. And an upper wall portion that is connected to the upper surface of the head cover and that is substantially along the upper surface of the head cover, and has a substantially L-shaped cross section. The vertical wall portion of the sound insulating cover is inserted into the lower end side of the rear surface portion of the head cover from above. An engaging portion for engaging the lower end portion of the head cover is provided on the upper surface of the head cover, and an engaging portion for engaging with an opening formed in the upper wall portion of the sound insulating cover that is substantially covered from above is provided. In the sound insulation cover, the lower end portion of the vertical wall portion is locked to the locking portion of the head cover rear surface portion, and the opening portion of the upper wall portion is engaged with the engaging portion of the head cover upper surface portion, An automobile engine structure, characterized in that it is attached to the head cover. 2. A panel body is disposed above substantially the entire head cover and above an upper wall portion of the sound insulation cover,
A sound insulation material is fixed to at least a predetermined region on the back surface side of the panel body, a terminal portion of an upper wall portion of the sound insulation cover is bent upward, and the bent portion contacts the sound insulation material of the panel body. The automobile engine structure according to claim 1, wherein the engine structure is in contact with each other.