FR2466615A1 - - Google Patents

Abstract

The walls form part of a labyrinth channel 6, coated with a soundproofing material, to allow access to the motor 3, the walls comprise internal 24 and external 22a, 23 doors mounted on hinges; thus the inner section 24 can pivot outwards through the opening provided by an outer section; this result is obtained by using less massive sections than in the prior art. (CF DRAWING IN BOPI)

Description

The present invention relates to a power unit

  silent operation, the combustion engine

  internal chamber itself being enclosed in a soundproofing chamber consisting of a housing whose side portions, having at least two walls, one inside the other, form at least air inlets for cooling and / or combustion air for the power unit and also, optionally, exhaust air outlets, said inlets and possibly outputs of output sound waves defining labyrinth channels jacketed with a material soundproofing in which the sound waves

  lose their sound effect by means of several changes

management.

  We already know engine groups to operate-

  such silencer of this type, the walls of the side portions of the housing are arranged to be able to separate them and allow access to the engine for the purposes

  inspection. However, in such a case, the entire structure

  of the sides of the housing divided into sections becomes openable to allow access to the group

  engine for inspection and maintenance. However,

  Such positives are relatively difficult to handle, bulky and, as a result of

  large pieces of work, they are easily damaged

  Magi. The present invention creates a more flexible and manageable device, with which errors

  of operation can only occur

  this device being essentially characterized in that the walls or doors in the lateral parts

  of the housing are individually mounted on

  in such a way that, when an outer door has been opened, a corresponding inner door in the labyrinth channel may also be opened and

  thus move away from the outer door.

  To achieve this objective, according to one embodiment of the invention, the axes of the bearings of the inner doors are offset relative to the axes of the bearings of the outer doors in a direction perpendicular to these axes. It is appropriate in such a case that the inner doors and the outer doors are hinged in the walls.

  opposing terminals or the opposite amounts of the room

soundproofing.

  Various other features of the invention

  come out from the detailed description which

follows.

  Forms of realization of the object of the invention

  are represented, by way of non-limiting example,

in the accompanying drawings.

  Fig. 1 represents an embodiment of

  the invention in which the soundproofing chamber pre-

  There are air intakes in the two lateral parts of the casing and the outlet is formed by a channel on the upper side of the soundproofing chamber, said channel opening into an end wall of the soundproofing chamber. Fig. 2 represents another embodiment of the invention in which the inlet is arranged in a lateral part of the casing of the soundproofing chamber and the outlet is formed in the other lateral part.

crankcase.

  Fig. 3 is a sectional view of the embodiment of FIG. 2, showing the entrance labyrinth channel

  divided longitudinally by means of a longitudinal wall

  additional soundproofing.

  Fig. 1 represents an internal combustion engine group and quiet operation in the form of a carriage 1 which contains in its central part a soundproofing chamber 2, in the center of which is mounted a

  3. The soundproofing chamber is

  delimited by lateral parts 4 and 5 of

  housing enclosing inlet labyrinth channels 6 and 7.

  At the top, the soundproofing chamber is delimited by a ceiling 8 through which the exhaust pipe

  the engine group passes to join a silencer 10.

  From the latter, the exhaust gases follow a pipe 11 opening into an outlet channel 12 formed between the ceiling 8 and a cover vault 8a, the pipe ultimately leading to the rear end wall 13 of the engine unit. Between this end wall 13 and the corresponding end wall 14 of the chamber

  soundproofing, a gearbox is installed

  engine, a small maintenance space for this engine

  ci and a tool bench or its equivalent. The access to the maintenance space of the gearing is done through an end gate 15. On the front end wall 16 of the power unit, spaces are provided for the cable reels or their equivalents serving the supply of the cables. necessary targets for the engine. Access to these spaces is

  made through a side door 16a.

  As can be seen in fig. 1, in the mode

  illustrated embodiment, entries 17 and 18 are

  in the walls 19 and 20 of the lateral parts of the

  casing. These inputs lead to insonation channels.

  6 and 7; the admitted air passes (as indicated by the arrows) first in the two channels of soundproofing 69 7 in the direction indicated by the arrows at

  from the front end wall 16 to the earth wall

  rear back 14; after that, the air is admitted into the soundproofing chamber 2 through openings in the inner walls of the soundproofing channels

  6 and 7, as represented by the curved arrows.

  The air then flows along the motor unit 3, through a compression fan 219 a radiator 22 and, as indicated by the upward pointing arrow, in an upward direction to reach a

  outlet channel 12 above the soundproofing chamber

  2. The air used together with the exhaust gas then passes into the rear end wall 13, as

  it is also indicated by an arrow at this point.

  As can be seen in fig. 1, the side walls of the housing comprise two outer doors 22a, 23 and an inner door 24. The outer door 22 is mounted on hinges 25 and 26 placed on an upright near the front end wall 16

  of the group, while the door 23 is mounted on

  27, 28 at the location of the end wall ar-

  14 of the soundproofing chamber 2.

  The inner door 24 is mounted on two

  whose upper hinge 29 is visible in FIG. 1. These two hinges are moved to the

  end wall 14 of the soundproofing chamber

  distance 2 such that the door 24, after the

  doors 22 and 23, could also be

  green without any obstructions on the left - doors -

  EXTERIOR. The layouts are identical in the other side

  the casing of the soundproofing chamber 2.

  In the embodiment shown in FIG. 2, for the sake of simplification, we contented ourselves

  to reveal the soundproofing chamber

  ment-called 2 and its outer walls. In this embodiment, the soundproof casing is designated as a whole by the reference 1; the outer door in

  the housing wall is designated 23 and the door

  reference is 24; the soundproofing chamber bears the reference 2; the power unit is designated 3; the compression fan is indicated by 21; the radiator is referenced 22; the exhaust pipe is indicated at 9; the silencer is referenced 10; the outlet pipe is designated 11; the ceiling of the soundproofing room is designated 8; the vault surmounting this ceiling bears the reference 8a; the rear end wall is designated 14; the outer side wall on the other side of the housing carries the reference

  7; and finally the entrance opening is designated 17.

  In this embodiment, fresh air is admitted through the inlet opening 17 as indicated by the arrow. The air then passes through the soundproofing channel 6, bypasses the inner side wall 24 of the casing (as indicated by the curved arrow), it flows

  longitudinally along the power unit until the

  compression 21, then it passes on the radiator 22 and is confused with an air flow to the upper outlet channel 12 to borrow the exit in the end wall 14, then joining

  another draft, as indicated by the arrow

  be, next to the front end wall 16 to enter the sound channel 7 formed in the other side of the housing and finally to exit through an opening in the side wall, as indicated by the

curved arrow.

  In this embodiment, the doors 23 and 24 in the side walls of the housing are mounted as follows: the door 23 is hinged to the rear end wall 14 of the soundproofing chamber by means of hinges 27 and 28; and the inner side door 24 is hinged to the front end wall 16 using

  two hinges whose upper hinge 29 appears

  ratt on the drawing. The doors on the other side of the housing

  forming the channel 7 are articulated in a similar manner.

  As is evident from the examination of the two modes of

  the invention has been described, the invention creates an efficient and convenient assembly, which is also very simple,

  side walls of the soundproofing channels, allow-

  both to access engine group 3 without risking damage

  mage the hinges in the side walls.

  Fig. 3 represents a cross section of the mode

  embodiment of FIG. 2, showing a long wall

  additional soundproofing 29 introduced in one of the soundproofing channels, in this case the channel 6. Moreover, the references in FIG. 3 denote the same organs as in FIG. 2. We have

246661 5

  used mixed lines to indicate how the two side doors 23 and 24 can open

  entirely to allow inspection of the power unit.

  The invention is not limited to the exemplary embodiments, shown and described in detail, since various modifications can be made without departing

of its frame.

Claims (3)

  1 - silent operation engine group, wherein the engine group 3 is enclosed in a sound chamber 2 defined by a housing, the side parts of this housing which comprise at least   two walls 4, 24, one inside the other,   at least inputs 17 for the cooling air   and / or combustion air for the power unit 3   and possibly also outlets for the used air, the-   said inputs and possibly also the outputs for the sound waves defining labyrinth channels 6, 7 jacketed with a soundproofing material, the sound waves losing their sound effect by means of several changes of direction, and the walls 4, 5, 24 side portions of the housing being arranged to allow to separate them to make the power unit accessible for inspection, characterized in that the door members 22a, 23, 24 in said walls   are individually mounted on hinges   that after the opening of the outer door   22a, 23, an inner door element corresponding to   laying 24 can also be opened and disengaged   of the outer door member or members 22a, 23.   2 - Motor unit according to claim 1, characterized   characterized in that the axes 29 of the bearings of the inner door members 24 are offset relative to the axes of the bearings 25, 26 of the outer door members 22a,   23 in a direction perpendicular to these axes.   3 - motor unit according to claim 1 or 2, characterized in that the inner door elements 24   and the outer door members 22a, 23 are articulated   on hinges in the opposite end walls   13 or 16 or the soundproofing room tion 2.