JPH0712676Y2 - Internal combustion engine with sound insulation cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an internal combustion engine with a sound insulation cover, and more particularly to an internal combustion engine with a sound insulation cover having a sound insulation cover divided into a cylinder block side and an oil pan side. .

[Prior art]

As shown in FIG. 6, in the internal combustion engine, the vibration level generated on the side surfaces of the cylinder block I and the oil pan 2 becomes large as it goes below the cylinder block I, and the oil pan 2 also resonates and vibrates. As the level increases, noise is generated.

There are two types of sound insulation covers that block the noise generated in the internal combustion engine: a type that covers the entire surface of the engine body with a sound insulation plate and a type that covers a part of the engine body with the sound insulation plate.

And as the former form, for example
No. 33 or No. 54-152833 is proposed, and as the latter type, for example, No.
-34939 publication is proposed.

[Problems to be solved by the invention]

By the way, as in the above-mentioned Japanese Utility Model Publication No. 56-49233 and Japanese Utility Model Publication No. 54-152833, covering the entire surface of the engine body with a sound insulating cover has the advantage of increasing the sound insulating effect, but on the other hand, Since the heat of the engine accumulates inside the sound insulation cover, cooling means is required, and the weight increases,
There is a problem in that there are problems such as poor maintainability.

Further, the above-mentioned Japanese Utility Model Laid-Open No. 51-34939 discloses the upper side shields fixed to both sides of the engine body above the internal combustion engine and the upper side shields fixed between the both side upper shields so as to be openable and closable. Although a sound insulation cover made of a plate is provided, however, when the sound insulation cover is provided close to the surfaces of the cylinder block and the oil pan, as shown in FIG. If the sound insulation covers 5 and 15 that are divided into parts of the oil pan 2 and the oil pan 2 are provided, there is also a restriction that the sound insulation cover 15 cannot be directly attached to the side wall of the oil pan 2, and thus the cylinder block 1 and the oil pan 2 are not provided. A space K in which there is no shielded area is generated between the parts and, that is, between the shielded area by the sound insulating cover 5 and the shielded area by the sound insulating cover 15, and noise of high vibration level P shown in FIG. 6 is generated from this space K. Leakage, it does not eliminate the problem that the sound insulation preventing effect becomes insufficient.

Therefore, the present invention was devised to eliminate the above-mentioned conventional drawbacks, and even if the sound insulation cover is divided into parts of the cylinder block and the oil pan to maintain maintainability, both sound insulation covers are in a continuous state. The purpose of the present invention is to provide an internal combustion engine with a sound insulation cover that can effectively prevent noise by holding the internal combustion engine.

[Means for solving problems]

An internal combustion engine with a sound insulation cover according to the present invention that achieves the above object is a sound insulation cover equipped with a sound insulation cover that covers the side wall of a cylinder block and an oil pan, and the sound insulation cover is located above and below the side wall. Is installed with a predetermined gap open and is divided into a first sound insulating cover that covers the side wall of the cylinder block and a second sound insulating cover that covers the side wall of the oil pan. The cover is fixedly supported only at a position above the skirt portion on the side wall of the cylinder block, and the second sound insulating cover is detachably supported only on the lower end portion of the first sound insulating cover through the connecting mechanism. The sound insulation covers are connected so as to be in a continuous state.

[Action]

Therefore, in order to maintain maintainability, the first sound insulation cover 5 that covers the side wall 1a of the cylinder block 1 and the second sound insulation cover 15 that covers the side wall 2a of the oil pan 2 are divided into parts. Even then, the sound insulating cover 5 fixedly supported only at a position above the skirt of the cylinder block side wall 1a is used, and the sound insulating cover 15 on the oil pan 2 side can be connected to this through a connecting mechanism. Moreover, since the sound insulation covers are in a continuous state by this connecting mechanism, it is possible to prevent the high noise level P from leaking from the space K as shown in FIG.
As shown in the comparison diagram of the figure, noise can be reduced as compared with the conventional one in which the space K exists.

〔Example〕

Hereinafter, the drawings showing the present invention as an embodiment will be described.

1 and 2, an oil pan 2 is fixed below a cylinder block 1 constituting an internal combustion engine E, and a screw hole is vertically provided at a position above a skirt portion of a side wall 1a of the cylinder block 1. A plurality of bosses 3 that are provided are projected, and a first sound insulation cover 5 that covers the cylinder block side wall 1a is fixedly supported by a mounting bolt 4 that is screwed into a screw hole of the boss 3.

The sound insulation cover 5 is integrally formed with an inner sound absorbing material 6 and a shielding plate 7 covering the outer side of the sound absorbing material 6, and when the inner surface of the sound absorbing material 6 contacts the end surface of the boss 3, the space between the sound absorbing material 6 and the side wall 1a. Is maintained at a predetermined interval H. Further, the sound absorbing material 6 has its upper, lower, left and right end surfaces fixed to the shielding plate 7. An elastic ring 9 made of rubber or the like is interposed between the outside of the shield plate 7 and the mounting bolt 4 to prevent vibration of the sound insulation cover 5.

On the other hand, the second sound insulating cover 15 that covers the side wall 2a of the oil pan 2
Is integrally formed with a filler 16 made of an inside foam material or an elastic material such as rubber, and a shielding plate 17 covering the outside of the filler 16. The filler 16 has an inner side and an oil pan 2 Since a predetermined distance H is maintained between the oil pan 2 and the side wall 2a of the oil pan, the filler 16 can prevent low-frequency vibration of the oil pan 2 and vibration of the sound insulation cover 15, and the upper side of the surface of the oil pan side wall 2a on the lower side. Since the air gaps H open upward and downward are continuous over the surface of the side wall 1a of the cylinder block on the side, the heat of the engine can be efficiently released.

The sound insulation cover 15 and the sound insulation cover 5 divided for each part are connected by a connection mechanism 10. That is, a plurality of nuts 11 fixed to the outer lower end of the shielding plate 7 and a plurality of bosses 12 fixed to the upper outside of the shielding plate 17 face each other with a predetermined distance along the vertical axis. Placed and the boss 12
The lower shield plate 17 is provided with a recess 14 for facilitating the tightening / loosening operation of the head of the mounting bolt 13, which will be described later, and the tip of each mounting bolt 13 fitted into this boss 12 is screwed into each nut 11. By doing so, the sound insulation cover 5 is not directly attached to the oil pan side wall 2a, but the sound insulation cover 5 fixedly supported only at a position above the skirt portion of the cylinder block side wall 1a is used to support the lower end portion of the sound insulation cover 5. Can be detachably connected only to. The mounting positions of the boss 12 and nut 11 described above may be turned upside down so that the mounting bolt 13 remains on the sound insulating cover 5 side.

At the time of this connection, the space M is provided between the lower end of the shield plate 7 and the upper end of the shield plate 17, and the protrusion 19 extending upward above the filler 16 is provided, whereby the sound insulation cover 5 side is provided. Since the lower end surface of the sound absorbing material 6 and the upper end surface of the filling material 16 on the sound insulating cover 15 side are joined in a compressed state by tightening the mounting bolts 13, both sound insulating covers 5 and 15 are in a continuous state, so that the cylinder block Even if the sound insulation cover 5 on the first side and the sound insulation cover 15 on the oil pan 2 side are divided into parts, both sound insulation covers
The space K as shown in FIG. 7 does not occur at the joint with 5,15. An elastic packing (not shown) made of rubber or the like extending along the width direction of the sound insulating cover may be compressibly interposed in the space M interposed between the lower end of the shielding plate 7 and the upper end of the shielding plate 17. . At this time, end face superposition of the sound absorbing material 6 and the filler 16 may be omitted. The width of the sound insulation covers 5 and 15 may be substantially equal to the width S of the cylinder block 1 and the oil pan 2 as shown in FIG. 5A.
As shown in FIG. 5, the width L may be longer than the cylinder block 1 and the rear wall 1b of the oil pan 2.

In addition, the connecting mechanism 20 shown as another example in FIG.
A plurality of bolts 21 whose heads are fixed to the inner side of the bottom of each are projected to the outside, and a plurality of mounting holes that fit into each of the bolts 21 are opened on the upper outside of the shielding plate 17 on the tip side of the sound insulating cover. An elastic packing 23 made of rubber or the like, which is fixed to the lower end of the connecting member 22 extending to the width and further extends to the width of the sound insulation cover interposed between the overlapping surfaces of both the shielding plates 7 and 17, an elastic ring 24 made of rubber or the like, and a flat washer. It is designed such that the nut 25 can be detachably tightened via 26. In the case of this example, an elastic packing in which the shield plate 7 and the shield plate 17 are interposed between both plates.
Since both sound insulation covers 5 and 15 are in a continuous state by being superposed in a compressed state through 23, the sound insulation cover 5 on the cylinder block 1 side and the sound insulation cover 15 on the oil pan 2 side are separated for each part as in the previous example. Even in the case of division, the space K as shown in FIG. 7 does not occur at the joint between the sound insulation covers 5 and 15.

[Effect of device]

The internal combustion engine with a sound insulation cover of the present invention is a sound insulation cover-equipped internal combustion engine having a sound insulation cover for covering the side wall of the cylinder block and the oil pan, and the sound insulation cover has a predetermined opening between the side wall and the lower side. And a second sound insulating cover that covers the side wall of the cylinder block and a second sound insulating cover that covers the side wall of the oil pan, and the first sound insulating cover is the cylinder block. It is fixedly supported only at a position above the skirt portion of the side wall, and the second sound insulation cover is detachably supported only on the lower end portion of the first sound insulation cover through the connecting mechanism, so that both sound insulation covers are supported. Since the configuration is such that they are connected in a continuous state, the following effects are achieved.

The sound insulation cover that covers the side wall of the cylinder block and the oil pan is divided into a first sound insulation cover that covers the side wall of the cylinder block and a second sound insulation cover that covers the side wall of the oil pan. The oil pan can be detachably connected, so that the oil pan can be easily maintained.

Moreover, since the cylinder block side wall and the oil pan side wall are covered with the connected both sound insulation covers, the noise of the cylinder block and the oil pan can be insulated. Moreover, since both sound insulation covers are joined so as to be in a continuous state, there is no gap at the connecting portion, and the leakage of noise from there can be completely prevented.

Further, the first sound insulation cover for covering the side wall of the cylinder block is fixed only to a position above the skirt of the side wall of the cylinder block where the vibration is relatively small, and the side wall of the oil pan is covered only for the lower end of the first sound insulation cover. By connecting the second sound-insulating covers and supporting both sound-insulating covers, it is possible to avoid supporting them at the position of the skirt portion or the oil pan of the cylinder block where the vibration is large.

In addition, since the contact between the both side walls and both sound insulation covers is cut off by making a gap between both side walls and both sound insulation covers, the sound insulation effect can be further improved. Since it is an open gap, there is also an effect that the heat of the engine can be efficiently radiated from this gap.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a front view of an internal combustion engine equipped with a sound insulating cover showing a right side of a center line and an imaginary line on the left side, and FIG. 2 shows only a right side of the center line. FIG. 3 is an enlarged vertical front view of the sound insulation cover shown in FIG. 3, FIG. 3 is an enlarged vertical front view of a main part showing another example of the coupling mechanism, and FIG. 4 is a noise comparison diagram.
FIG. 5A is a side view of the sound insulation cover, and FIG. 5B is a side view showing a case where the shielding length of the sound insulation cover is extended. 6 to 7 show a conventional example, FIG. 6 is an explanatory view showing a noise level showing the internal combustion engine in a front view, and FIG. 7 is a schematic front view of the internal combustion engine. E ... Internal combustion engine, 1 ... Cylinder block, 1a ... Cylinder block side wall, 2 ... Oil pan, 2a ... Oil pan side wall, 3 ... Boss, 4 ... Mounting bolt, 5 ... Sound insulation cover, 6 …… Sound absorbing material, 7 …… Shield plate, 10 …… Coupling mechanism,
15 ... Sound insulation cover, 16 ... Filling material, 17 ... Shielding plate, 19 ...
… Projection, 20 …… Coupling mechanism, 23 …… Elastic packing.

Claims (1)

[Scope of utility model registration request] 1. An internal combustion engine with a sound insulating cover provided with a sound insulating cover for covering a side wall of a cylinder block and an oil pan, wherein the sound insulating cover has a predetermined gap between the side wall and the sound insulating cover. It is mounted and is divided into a first sound insulating cover that covers the cylinder block side wall portion and a second sound insulating cover that covers the oil pan side wall portion.
The sound insulation cover is fixedly supported only at a position above the skirt portion of the side wall of the cylinder block, and the second sound insulation cover is detachably attachable only to the lower end portion of the first sound insulation cover through the connecting mechanism. An internal combustion engine with a sound insulation cover, which is supported and connected so that both sound insulation covers are in a continuous state.