JPS5943472Y2 - Internal combustion engine noise suppression device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement of a noise suppression device for an internal combustion engine.

Conventionally, this type of noise prevention device for internal combustion engines has been equipped with a sound insulating plate by providing a certain space around the engine's cylinder block in order to surround the sound source of engine noise and reduce the amount of sound transmitted to the outside. Alternatively, a mounting plate may be placed, and a sound absorbing material such as glass wool may be interposed between the outer wall of the cylinder block and the sound insulating plate or mounting plate to absorb or block engine noise and increase the soundproofing effect. I saw something to do.

However, in this type of noise prevention device, engine oil, moisture, etc. often permeate sound absorbing materials such as glass and wool, so they cannot function as sound absorbing materials sufficiently, and internal combustion The noise prevention measures for the engine were insufficient.

The purpose of this invention is to prevent engine oil, moisture, etc. from penetrating into the sound-absorbing material even under adverse conditions where they tend to adhere, and to maintain the function of the sound-absorbing material over a long period of time, thereby reducing engine noise. An object of the present invention is to provide a noise prevention device for an internal combustion engine that can surround a sound source and reduce transmitted sound to the outside.

To this end, the noise prevention device for an internal combustion engine of this invention includes a cylinder block cover disposed at appropriate intervals on the side wall of the internal combustion engine, for example, the side wall of the cylinder block, and the cylinder block cover and the cylinder block cover.・Cylinder flock backing material is attached to the inside of the outer peripheral edge of the cylinder block cover so as to form a closed space between it and the side wall of the flock, and the cylinder block cover is covered with an oil-resistant coating material and side wall and cylinder
Cylinder block sound absorbing material filled in the closed space formed by the block cover and cylinder flock backing material, or oil absorbing material placed at appropriate intervals on the outer circumferential surface of the oil pan of an internal combustion engine. a pan cover; an oil pan backing material attached to the upper edge of the oil pan cover so as to form a closed space between the oil pan cover and the outer peripheral surface of the oil pan; It consists of an oil pan sound absorbing material, etc. that is covered with an oil-resistant coating and filled in a closed space formed by the outer peripheral surface of the oil pan, the oil pan cover, and the oil pan backing material. .

Hereinafter, preferred specific examples of the noise prevention device for an internal combustion engine according to this invention will be described with reference to the drawings.

Figure 1 shows a concrete example 1 of the internal combustion engine noise prevention device of this invention.
It shows 0.

This noise prevention device 10 for an internal combustion engine includes a cylinder block cover 20.20a disposed at a constant distance from a side wall 13° 13a of a cylinder block 12 in an engine 11;
, 20a and the side wall 13.13a of the cylinder block 12.
A cylinder block backing material 22゜2 attached to the inside of the outer peripheral edge of the cylinder block cover 20.20a so as to form a closed space 21 between the cylinder block cover 20.20a and the cylinder block backing material 22.
2a and side wall 13 of cylinder block 12 = 1
3a, cylinder block cover 20°20a,
The cylinder, which fills the closed space 21.21a formed by the cylinder block and backing material 22°22a.
block sound absorbing material 23.23a; and an oil pan cover 30 disposed at a constant distance from the outer peripheral surface 15 of the oil pan 14;
0 and the outer circumferential surface 15 of the oil pan 14.
Oil pan backing material 3 attached to the upper edge of the oil pan cover 30 to form a
2, and the outer peripheral surface 15 of the oil pan 14, and the oil
Pan cover 30 and oil pan backing material 32
and an oil pan sound absorbing material 33 filled in a closed space 31 formed by the above.

In other words, this cylinder block cover 20°20
The cylinder block cover 20a is made of a metal plate. Inside the outer periphery of the cylinder block cover 20a is a cylinder block backing material 2 made of heat-resistant synthetic resin, synthetic rubber, etc.
2.22a is installed, and this cylinder block backing material 22.22a is positioned so as to contact the side walls 13, 13a of the cylinder block 12 in the engine 11, and the side wall 13.13a of the cylinder block 12 and the cylinder flock - A cylinder block sound absorbing material 23.23a is attached to fill the closed space 21.21a formed between the cover 20.20a and the cover 20.20a.

The cylinder block sound absorbing material 23=23a is formed by covering the entire surface of a sound absorbing material 24 made of glass fiber or a foam layer with an oil-resistant and heat-resistant covering material 25 such as aluminum foil.

Of course, the cylinder block cover 20.20a is attached to the side wall 13 of the cylinder block 12 in the engine 11,
13a, it is fixed at an appropriate position using a screw (not shown) via rubber or the like.

The oil pan cover 30 also covers the oil pan 14.
The oil pan cover 30 is formed by press molding of a metal plate to have an inner diameter larger than the outer circumferential surface 15 of the oil pan cover 30, and an oil pan cover 30 made of heat-resistant synthetic resin, synthetic rubber, etc. is provided at the upper edge of the oil pan cover 30. The backing material 32 is attached so as to protrude inward, and this oil pan backing material 3 is
2 is placed in contact with the upper end of the oil pan 14, and an oil pan sound absorbing material 33 is placed in the closed space 31 formed between the outer peripheral surface 15 of the oil pan 14 and the oil pan cover 30. It can be installed by filling it.

Of course, this oil pan sound absorbing material 33 is similar to the cylinder block sound absorbing materials 23 and 23a described above, and the entire surface of the sound absorbing body 24 made of glass fiber or a foam layer is covered with an oil-resistant and heat-resistant material such as aluminum foil. The oil pan cover 30 is formed by covering it with a certain covering material 25, and when the oil pan cover 30 is attached around the oil pan 14, it is formed by covering it with a certain covering material 25. Secure using screws (not shown).

According to this invention, each cover is attached via a backing material at appropriate intervals around the engine's cylinder block, oil pan, cylinder head cover, etc. The closed space is filled with sound-absorbing material covered with an oil-resistant coating, so even if engine oil or moisture adheres to the sound-absorbing materials such as the cylinder block and oil pan, the interior will not be affected. The sound-absorbing material maintains its function over a long period of time without penetrating into the engine, and it can surround the sound source of engine noise and reduce the amount of sound transmitted to the outside.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a noise prevention device for an internal combustion engine according to this invention, and FIG. 2 is a perspective view with a part of the sound-absorbing material destroyed. 10... Internal combustion engine noise prevention device, 12...
...Cylinder block, 13.13a...
Side wall, 14...Oil pan, 15...
・Outer peripheral surface, 20=20a...Cylinder block cover 2L21a...Closed space, 22=22
a...Cylinder flock backing material, 2
3.23a...Cylinder block sound absorbing material, 2
5... Covering material, 30... Oil pan cover, 31... Closed space, 32...
・Oil pan backing material, 33...Oil pan sound absorbing material.

Claims (1)

[Claims for Utility Model Registration] A side wall cover arranged at appropriate intervals on the side wall of a cylinder block, etc. of an internal combustion engine, and a closed space is formed between the side wall cover and the outer wall of the cylinder block, etc. The backing material is attached to the inside of the outer periphery of the side wall cover, and the closed space formed by the side wall of the cylinder block, etc., the side wall cover, and the backing material is filled. A noise prevention device for an internal combustion engine, including a sound absorbing material.