JPH0210272Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a soundproofing device for an engine, and in particular, a soundproofing device is provided between the engine body and auxiliary equipment or attached parts placed near the engine, and this soundproofing device reduces noise caused by standing waves. The present invention relates to an engine soundproofing device that prevents noise.

An internal combustion engine is composed of a cylinder block, and various parts are assembled to the cylinder block. Various auxiliary machines and accessories are attached to the vicinity of the engine, which constitute the engine. In this way, various auxiliary machines and attached parts are installed near the engine, so if there is a space between the engine body and the auxiliary machines or attached parts, standing waves may occur in this space. This standing wave causes noise. In order to prevent noise caused by such standing waves, for example, Japanese Utility Model Publication No. 57-7779 proposes filling the space between the auxiliary equipment or attached parts and the engine body with sound-absorbing material. .

The sound absorbing material 1 used in such cases has a substantially rectangular cross section, as shown in FIG.
In the case of a diesel engine, such a sound absorbing material 1 is inserted between a cylinder block 2 and a fuel injection pump 3, as shown in FIG. 2, for example. In order to prevent the sound absorbing material 1 from falling off, it is made into a shape that is larger than the gap between the cylinder block 2 and the pump 3 when it is free, and the crushing margin is used to prevent the sound absorbing material 1 from falling off. I was trying to keep it between.

Therefore, according to such a conventional soundproof structure, force is not applied uniformly to the entire surface of the sound absorbing material 1, but force is applied locally, which causes the sound absorbing material 1 to deform unnaturally. Additionally, as shown in FIG. 2, a gap 4 is created between the sound absorbing material 1 and the cylinder block 2 or between the sound absorbing material 1 and the pump 3, which reduces the sound absorbing effect. Furthermore, since the sound absorbing material 1 has a crushing margin, there is a drawback that the installation of the fuel injection pump 3 becomes troublesome.

The present invention has been made in view of these problems, and it is an object of the present invention to provide an engine soundproofing device that has excellent soundproofing effects and is easy to install.

The invention will now be explained with reference to the illustrated embodiments. 3 and 4 show a soundproofing device according to a first embodiment of the present invention, and this soundproofing device is equipped with a buffer body 10. FIG. The buffer body 10 is made of synthetic rubber and has a substantially rectangular peripheral wall that matches the outer shape of the fuel injection pump, and is hollow inside. The buffer body 10 is fixed to both sides of the mounting plate 11. The mounting plate 11 is made of a steel plate, and is connected to the mounting plate 11 so that when the buffer body 10 is fixed, its peripheral edge portions are embedded in the buffer bodies 10 on both sides. Attachment pieces 12 are continuously provided at predetermined positions on the peripheral edge of the attachment plate 11, and bolt insertion holes 13 are formed in each of the attachment pieces 12.

As shown in FIG. 5, a soundproofing device comprising such a shock absorber 10 and a mounting plate 11 is inserted, for example, between a cylinder block 14 and a fuel injection pump 15 of a diesel engine. This shock absorber is attached to a mounting seat 16 of a cylinder block 14 using a mounting piece 12 of a mounting plate 11. That is, a rubber bush 17 is attached to the mounting seat 16, and the mounting piece 12 of the mounting plate 11 is mounted on the rubber bush 17, and is fixed with a fixing bolt 18. In this embodiment, a soundproofing device consisting of a shock absorber 10 and a mounting plate 11 is arranged not only between the fuel injection pump 15 and the cylinder block 14 but also between the starter motor 19 and the cylinder block 14. has been done. This soundproofing device is also attached to the mounting seat 16 via the rubber bushing 17 with the fixing bolt 18.
installed on.

As described above, the soundproofing device according to the present embodiment is constituted by the shock absorber 10 to which the mounting plate 11 is coupled, and the end surfaces of the peripheral wall portions of the shock absorber 10 on both sides are connected to the cylinder block 14 and the fuel injection pump 1.
5, the space between the cylinder block 14 and the fuel injection pump 15 is completely closed off by the peripheral wall portion of the buffer body 10. Therefore, even if a standing wave is generated between the two, the noise caused by the standing wave is blocked from the outside by the buffer 10, so that the noise will not leak to the outside. Therefore, noise caused by standing waves between the cylinder block 14 and the fuel injection pump 15 can be completely prevented.

In addition, since the buffer body 10 is fixed to the cylinder block 14 via the mounting plate 11, there is no need to provide a crushing allowance for the buffer body 10, which makes the installation of the fuel injection pump 15 very difficult. becomes easier. Similarly, the installation of the starter motor 19 is also facilitated. Furthermore, since no crushing allowance is required, there is no variation in the soundproofing effect from engine to engine.

Next, a modification of the above embodiment is shown in FIGS. 6 and 7.
This will be explained with reference to the diagram. In this modification, parts corresponding to those in the above embodiment are given the same reference numerals, and descriptions of parts having the same configuration will be omitted. A feature of this modification is that the mounting plate 11 is designed to also serve as a proximal plate that covers the outer surface of the cylinder block 14 and blocks out noise. That is, the mounting plate 11 is much larger than that of the above embodiment, and has a size that covers the side surface of the cylinder block 14, and on both sides of the upper part of the mounting plate 11, there are buffer bodies 10 each consisting of a peripheral wall. Molded.

Such a soundproofing device has a fuel injection pump 15 attached to the buffer body 10, and
The mounting plate 11, which also serves as a proximal plate, is arranged so that it is spaced a predetermined distance from the outer surface of the cylinder block 14 by attaching the bolt 1 through the rubber bush 17.
8 to be fixed to the mounting seat 16. Therefore, according to this modification, noise caused by standing waves between the cylinder block 14 and the fuel injection pump 15 can be prevented. Furthermore, the mounting plate 11 which also serves as a proximal plate makes it possible to block noise emitted from the cylinder block 14 to the outside, making it possible to provide an engine with even better soundproofing effects.

Next, a second embodiment of the present invention will be described with reference to FIGS. 8 and 9. This second embodiment relates to a device for preventing noise caused by standing waves between a cylinder block 14 and a starter motor 19. The soundproofing device for preventing this noise is composed of a buffer body 10 made of a peripheral wall portion, as in the first embodiment, and a mounting plate 11 coupled to the buffer body 10. is starter motor 19 and cylinder block 1
It is inserted between 4. The upper part of the mounting plate 11 is extended upward to form an extension part 20.
It consists of The upper end of this extending portion 20 is further bent laterally, and a sound absorbing material 21 is fixed to this bent portion. The extending portion 20 to which the sound absorbing material 21 is fixed constitutes an insulator 22. The insulator 22 is arranged between the fuel filter 23 and the exhaust pipe 24 to prevent the temperature of the fuel filter 23 from rising due to radiant heat from the exhaust pipe 24.

In the above configuration, the soundproofing device inserted between the cylinder block 14 and the starter motor 19 prevents noise caused by standing waves generated in the space between them, as in the first embodiment. It turns out. Further, an extending portion 20 is integrally connected to the mounting plate 11 constituting this soundproofing device, and this extending portion 20 constitutes an insulator 22. Since the soundproofing device and the insulator 22 are integrally combined in this way, the number of parts can be reduced, and the number of man-hours for assembling the engine can be reduced.

Furthermore, since the insulator 22 has a sound absorbing material 21 attached to the extending portion 20, this sound absorbing material 2
1, it is possible to prevent secondary radiation, and it becomes possible to more reliably protect the filter 23 from the heat of the exhaust pipe 24. Further, since the sound absorbing material 21 is coupled to the distal end side of the extending portion 20, vibrations of the insulator 22 are prevented, and vibrations can be further reduced. Further, the insulator 22 has its lower end portion 20 supported by a soundproofing device, and its upper portion secured to the mounting seat 1 of the cylinder block 14 via a rubber bushing 17 with a fixing bolt 18.
6, the support of the insulator 22 becomes stable.

Although the present invention has been described above with reference to the two illustrated embodiments, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. For example, the above embodiment relates to a device for preventing noise caused by standing waves between a fuel injection pump or a starter motor and a cylinder block, but the present invention also relates to a device for preventing noise caused by standing waves between a fuel injection pump or a starter motor and a cylinder block. It can be applied to a device for preventing noise caused by standing waves between.

As described above, the present invention fixes the buffer body, which is hollow and consists of a peripheral wall part, to both sides of the mounting plate,
The mounting plate is removably attached to the engine body, and one side of the buffer body can be closely attached to the engine body, and the other side can be attached closely to auxiliary equipment or attached parts. Therefore, according to the present invention, the space between the auxiliary equipment or accessory parts and the engine body can be sealed by the buffer body made of the peripheral wall, and noise caused by standing waves generated in the space between the two can be sealed. It is possible to reliably prevent this. Furthermore, since the shock absorber is attached via the mounting plate, almost no crushing allowance is required, which facilitates assembly and prevents variations in the soundproofing effect from engine to engine.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a sound absorbing material used in a conventional soundproofing device, Fig. 2 is a sectional view showing a main part of a conventional engine soundproofing device using this soundabsorbing material, and Fig. 3 is a sectional view showing the main part of a conventional engine soundproofing device using this sound absorbing material. FIG. 4 is a sectional view taken along the line ~ in FIG. 3, FIG. 5 is a front view of an engine with the above soundproofing device installed, and FIG. 6 is a soundproofing device according to a modified example. Figure 7 is a front view of the engine equipped with this soundproofing device.
FIG. 8 is a side view of an engine equipped with a soundproofing device according to a second embodiment of the present invention, and FIG. 9 is a front view thereof. In addition, in the symbols used in the drawings, 10...Buffer, 11...Mounting plate, 12...Mounting piece, 14
... cylinder block, 15 ... fuel injection pump, 19 ... starter motor.

Claims (1)

[Claims for Utility Model Registration] 1. A hollow buffer body consisting of a peripheral wall portion is fixed to both sides of a mounting plate, the mounting plate is removable from the engine body, and one of the buffer bodies is closely attached to the engine body. A soundproofing device for an engine, characterized in that the other side can be brought into close contact with auxiliary equipment or attached parts. 2. The engine soundproofing according to claim 1, wherein the mounting plate extends along the surface of the engine body to the outside of the peripheral wall and covers the outer surface of the engine body. Device. 3. The engine soundproofing device according to claim 1, wherein a part of the mounting plate extends outside the buffer body, and this extended part constitutes an insulator.