JP4183698B2 - Engine room soundproofing device - Google Patents

Description

  The present invention relates to an engine room soundproofing device, and more particularly to an engineroom soundproofing device having a sound absorbing device for absorbing the sound of an engine muffler installed in an engine room of a construction machine or the like.

  2. Description of the Related Art Conventionally, in construction machines and the like, an engine muffler is disposed in an engine room, and a tail pipe extending from the muffler body extends outside the engine room to discharge exhaust gas from the engine to the atmosphere. FIG. 6 is a side sectional view showing a first example of an engine muffler installed in a conventional engine room, and FIG. 7 is a plan view. 6 and 7, a hood 2 is disposed in the engine room 1 so as to be freely opened and closed, and an engine 3 is disposed in the engine room 1. A body 11 of a muffler 10 having an upward tail pipe 12 is attached to a bracket 4 fixed to the engine 3. A heat shield 50 is attached to the side surface of the body 11 so as to prevent a fire when the hydraulic equipment 5 attached to the rear part of the engine 3 is damaged and oil is scattered. On the upper side of the muffler 10, a hole 6 through which the tail pipe 12 is passed is provided in the hood 2, and a gap is provided between the hole 6 and the tail pipe 12 so that the hole 6 and the tail pipe 12 do not interfere when the hood 2 is opened and closed. 7 is provided.

  FIG. 8 is a side sectional view showing a second example of an engine muffler installed in a conventional engine room. The same parts as those in the first example are denoted by the same reference numerals and description thereof is omitted, and only different parts will be described. A split tail tube 51 is fastened to the hood 2 on the upper side of the muffler 10 a by bolts 52. The distal end portion of the discharge pipe 53 of the muffler 10 a is inserted into the proximal end portion of the divided tail pipe 51. Between the split-type tail pipe 51 and the discharge pipe 53, there is provided a gap 54 for escaping dimensional errors between them and swinging by an elastic body (not shown) that holds the engine 3.

However, the above configuration has the following problems.
(1) In the first example, as shown in FIG. 6, since a gap 7 is provided between the tail tube 12 and the hole 6 of the hood 2, the shell in which the body 11 of the muffler 10 is generated from the gap 7. Sound A propagates as leakage sound B to the outside, and the ambient noise is large.
(2) In the second example, as shown in FIG. 8, the shell sound A generated by the body 11 of the muffler 10a from the gap 54 between the divided tail pipe 51 and the discharge pipe 53 of the muffler 10a The exhaust leak sound C is generated from the gap 54, and the noise in the engine room 1 is enhanced together with the shell sound A generated from the surface of the body 11 of the muffler 10, and is transmitted to the outside as a transmitted sound D from the wall surface. The ambient noise is large.

  The present invention pays attention to the above problems, and relates to an engine room soundproofing device, and in particular, provides an engineroom soundproofing device capable of reducing leakage noise and reducing ambient noise and absorbing noise in the engine room. The purpose is to do.

  In order to achieve the above object, a first invention of an engine room soundproofing apparatus according to the present invention is an engine room soundproofing apparatus for soundproofing the sound of an engine muffler installed in an engine room having a hood that can be freely opened and closed. On the outer periphery of the tail pipe, between the plate arranged so as to cover the muffler body, the tail pipe attached to the muffler body and projecting from the upper surface of the engine room hood, and the plate and the hood It is set as the structure which has the sound-absorbing member equipped.

  According to a second aspect of the present invention, in the engine room soundproofing device of the first aspect, the sound absorbing member mounted on the outer peripheral portion of the tail pipe includes an elastic member that contacts the lower surface of the hood of the engine room, and a sound absorbing member mounted on the tail pipe. It is set as the structure which is a 2 layer structure which consists of a member.

  According to a third aspect of the present invention, in the engine room soundproofing device according to the first aspect of the present invention, a sound insulating plate is attached to the hood side of the engine room in the vicinity of the outer periphery of the sound absorbing member mounted on the outer peripheral portion of the tail pipe.

  According to a fourth aspect of the present invention, in the engine room soundproofing device according to any one of the first to third aspects, a waterproof member is provided on the upper surface side of the sound absorbing member fitted to the tail pipe.

  According to the first invention, the shell sound generated from the body surface of the muffler and the noise in the engine room are not absorbed by the sound absorbing member mounted on the outer peripheral portion of the tail pipe and leaked to the outside. Noise can be reduced. Moreover, while absorbing the sound which generate | occur | produces from the surface of the outer peripheral part of a tail pipe, the vibration of a tail pipe can be reduced and muffler noise can be reduced.

  Further, according to the second aspect of the present invention, the elastic member abuts the lower surface of the hood of the engine room simply by closing the hood of the engine room, and the gap between the muffler and the hood is closed. Sound is reduced and ambient noise is reduced.

  According to the third aspect of the invention, the sound absorbing passage is formed between the sound absorbing member mounted on the outer peripheral portion of the tail pipe and the sound absorbing plate, so that the leakage noise can be absorbed and the ambient noise can be reduced.

  According to the fourth aspect of the invention, even if rainwater or the like enters from the gap between the hole of the hood of the tail tube, the sound absorbing member does not affect the sound absorbing performance, and stable sound absorbing performance can be ensured.

  Hereinafter, embodiments of an engine room soundproofing apparatus according to the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a side sectional view of a first embodiment of an engine room soundproofing device 20. A body 11 of a muffler 10 having a tail pipe 12 is attached to a bracket 4 fixed to the engine 3 upward. The bracket 4 is fixedly provided with a plate 21 disposed so as to cover the side of the body 11 and the upper side thereof. A hole 21a is formed in the plate 21, and a tail tube 12 passes through the hole 21a. A tip portion of the tail tube 12 is a hole provided in a hood 2 attached to the engine room 1 so as to be freely opened and closed. 6 protrudes to the atmosphere side. Further, a gap 7 for preventing interference is provided between the tail tube 12 and the hole 6. An outer surface sound absorbing member 22 and an inner surface sound absorbing member 23 are bonded to both the inner surface and the outer surface of the plate 21. The outer sound absorbing member 22 and the inner sound absorbing member 23 are made of a sound absorbing material made of a porous material such as urethane, glass wool, felt, or asbestos. The outer periphery of the tail tube 12 is between the upper surface of the plate 21 and the lower surface of the hood 2 and the outer periphery of the tail tube 12 has heat resistance made of, for example, class wool, felt, urethane, or asbestos. The sound absorbing member 24 has a cylindrical shape, and the periphery thereof is held by a holding member 25 made of a punching metal, a wire mesh, or the like. A waterproof member 26 made of glass cloth woven with glass fiber or neoprene rubber is bonded to the upper surface of the sound absorbing member 24 in order to prevent rainwater or the like from penetrating. A cylindrical sound absorbing plate 27 provided in the vicinity of the outer periphery of the holding member 25 is fixed on the lower surface of the hood 2, and a sound absorbing passage 28 is formed by the holding member 25, the sound absorbing plate 26 and the hood 2. Yes.

  Next, functions and effects will be described. The shell sound A generated from the surface of the body 11 of the muffler 10 is absorbed by the inner sound absorbing member 23, and the heat is also cut off at the same time, acting as a heat shield, preventing the occurrence of fires when the hydraulic equipment is damaged. To do. Noise in the engine room 1 is absorbed by the outer sound absorbing member 22, and the transmitted sound D from the wall surface of the engine room 1 and the hood 2 is reduced. The sound absorbing member 24 mounted on the outer peripheral portion of the tail pipe 12 absorbs noise generated by the tail pipe 12, reduces vibration of the tail pipe 12, and reduces noise. Since the waterproof member 26 is bonded to the upper surface of the sound absorbing member 24, rainwater or the like does not penetrate and the sound absorbing characteristics are not deteriorated. Noise leaking from the gap 7 between the tail pipe 12 and the hole 6 is absorbed by the sound absorbing member 24 when passing through the sound absorbing passage 28, and the leakage sound B is reduced.

  FIG. 2 is a partial cross-sectional side view of the second embodiment of the engine room soundproofing device 20a. The sound absorption is applied to the inner surface of a cylindrical sound insulating plate 27 fixed to the hood 2 of the engineroom soundproofing device 20 of the first embodiment. The member 29 is bonded. As for the action and effect, when the noise leaking from the gap 7 between the tail tube 12 and the hole 6 passes through the sound absorbing passage 28, the sound absorbing member 24 on the outer peripheral side of the tail tube 12 and the cylindrical sound absorbing plate 26 are provided. The sound-absorbing member 29 absorbs the leakage sound B, and the leakage sound B is further reduced. Since other noise reductions are the same as those in the first embodiment, description thereof is omitted.

  FIG. 3 is a partial cross-sectional side view of a third embodiment of the engine room soundproofing device 20b. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted, and only different parts will be described. The upper edge of the holding member 25 provided on the surface of the sound absorbing member 24 mounted on the outer peripheral portion of the tail tube 12 is protruded from the upper surface of the sound absorbing member 24, and the seal rubber 30 is attached to the protruding portion. The upper end portion of the seal rubber 30 is in contact with the lower surface of the hood 2 and is deformed by a predetermined amount. The shape of the seal rubber 30 is formed in an elliptical cross-sectional shape with a hollow on the upper side contacting the lower surface of the hood 2, and the lower side connected to it is formed in a substantially rectangular cross-sectional shape at the center. Is provided with a slit for insertion into the holding member 25 to facilitate attachment. Thereby, the inside of the engine room 1 and the hole 6 of the hood 2 are isolated, and noise is prevented from leaking from the gap 7 between the tail tube 12 and the hole 6 of the hood 2. Since the seal rubber 30 is deformed by a predetermined amount and is in contact with the lower surface of the hood 2, the seal rubber 30 and the hood 2 are not separated even if the relative position of the muffler 10 and the hood 2 varies due to vibration or the like. Accordingly, sound is prevented from leaking from the gap 7 between the tail tube 12 and the hole 6 of the hood 2 and the ambient noise is reduced. Since other noise reductions are the same as those in the first embodiment, description thereof is omitted.

  FIG. 4 is a partial cross-sectional side view of a fourth embodiment of the engine room soundproofing device 20c. The same parts as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only different parts will be described. The upper surface of the sound absorbing member 24 mounted on the outer peripheral portion of the tail tube 12 is protruded from the upper surface of the holding member 25 provided on the surface, and between the upper surface of the sound absorbing member 24 and the lower surface of the hood 2, for example, rubber, An annular elastic member 31 that is easily deformed is made of a rubber such as urethane rubber or a synthetic resin such as nylon or urethane, and is deformed by a predetermined amount. Therefore, the inside of the engine room 1 and the hole 6 of the hood 2 are isolated. Since the operation and effect are the same as those of the third embodiment, the description thereof is omitted.

  FIG. 5 is a partial cross-sectional side view of a fifth embodiment of the engine room soundproofing device 20d. The same parts as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only different parts will be described. A cylindrical elastic member 32 is provided on the outermost peripheral portion of the sound absorbing member 24 mounted on the outer peripheral portion of the tail tube 12, and the surface thereof is held by the holding member 25. The cylindrical elastic member 32 is, for example, a rubber material such as rubber or urethane rubber, or a synthetic resin such as nylon or urethane, and is a sound-absorbing material having a porous material. Make a certain amount of deformation and insert. The cylindrical elastic member 32 is protruded from the upper surfaces of the sound absorbing member 24 and the holding member 25, and is deformed and brought into contact with the lower surface of the hood 2 by a predetermined amount. Therefore, the inside of the engine room 1 and the hole 6 of the hood 2 are isolated. Since the operation and effect are the same as those of the third embodiment, the description thereof is omitted.

It is side surface partial sectional drawing of the engine room soundproofing apparatus of 1st Example of this invention. It is side surface partial sectional drawing of the engine room soundproofing apparatus of 2nd Example of this invention. It is side surface partial sectional drawing of the engine room soundproofing apparatus of 3rd Example of this invention. It is side surface partial sectional drawing of the engine room soundproofing apparatus of 4th Example of this invention. It is side surface partial sectional drawing of the engine room soundproofing apparatus of 5th Example of this invention. It is side surface sectional drawing which shows the 1st example of the muffler of the engine installed in the conventional engine room. It is a top view which shows the 1st example of the muffler of the engine installed in the conventional engine room. It is side surface sectional drawing which shows the 2nd example of the muffler of the engine installed in the conventional engine room.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine room 2 Hood 3 Engine 4 Bracket 6 Hole 7 Gap 10 Muffler 11 Body 12 Tail tube 20, 20a, 20b, 20c, 20d Engine room soundproofing device 21 Plate 22 Outer surface sound absorbing member 23 Inner surface sound absorbing member 24 Sound absorbing member 25 Holding member 26 Waterproof member 27 Sound insulation plate 28 Sound absorbing passage 30 Seal rubber 31 Annular elastic member 32 Cylindrical elastic member

Claims (4)

  In the engine room soundproofing device that prevents the sound of the muffler (10) of the engine (3) installed in the engine room (1) with the hood (2) that can be opened and closed, close to the body (11) of the muffler (10) A plate (21) disposed so as to cover, a tail pipe (12) attached to the body (11) of the muffler (10) and projecting from the upper surface of the hood (2) of the engine room (1), and the plate An engine room soundproofing device comprising a sound absorbing member (24) fitted on the outer peripheral portion of the tail pipe (12) between the (21) and the hood (2).   The engine room soundproofing device according to claim 1, wherein the sound absorbing member (24) mounted on the outer peripheral portion of the tail pipe (12) is an elastic member (32) that contacts the lower surface of the hood (2) of the engine room (1). And a two-layer structure comprising a sound absorbing member (24) mounted on the tail pipe (12).   In the engine room soundproofing device according to claim 1, on the hood (2) side of the engine room (1), a sound insulation plate (close to the outer periphery of the sound absorbing member (24) mounted on the outer periphery of the tail pipe (12) 27) Engine room soundproofing device characterized by mounting.   The engine room soundproofing device according to any one of claims 1 to 3, wherein a waterproofing member (26) is provided on an upper surface side of the sound absorbing member (24) mounted on the tail pipe (12).

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