DE202008010788U1 - Acoustic chamber with variable volume - Google Patents

Abstract

Acoustic chamber (1) each having a tube (2, 3) for the supply and removal of a noise-generating volume of air and means for changing the chamber volume, characterized in that the means for changing the chamber volume of kinkable or foldable areas (4, 5; 7) of the chamber wall and / or the transition between the chamber (1) and the tubes (2, 3), wherein by folding or unfolding the regions (4, 5; 7) a reduction or increase in the volume of the chamber (1) is achievable.

Description

Technical area

The The invention relates to an acoustic chamber with variable Volume, in particular for a Ansauggeräuschdämpfer for an internal combustion engine, which is arranged in the course of an air intake pipe is, according to the preamble of the main claim.

State of the art

It is for example from the DE 195 01 411 A1 an intake device is known in which particularly the noise emission of the internal combustion engine is reduced by a variable size of the passage opening for the intake air volume. Here, with a arrangement of an inner and an outer tube for each rotational speed of the internal combustion engine, a specific size of the passage opening is present, wherein at low speeds a small diameter leads to the lowest possible noise emission.

From the DE 10 2005 031 944 B4 a modular muffler is known in which in a closure element at least one tube element is inserted, which can be introduced into a step-shaped opening provided with different diameters.

Furthermore, is seen from the EP 1 173 819 A3 known that a pipe connection to an intake silencer of the type mentioned with a first pipe end to the pipe end of a counter piece is connectable, wherein a pipe end is so flexible that it overlaps the other pipe end with a sealing seat. Here, a fold-like expandable area at the flexible tube end is present as a so-called kink tube, which is slid over the other end of the tube up to a radially encircling sealing seat.

Disclosure of the invention

outgoing of the arrangements mentioned above is to be with the invention the problem to be solved, a particularly easy to manufacture acoustic chamber to obtain their volume changeable by simple means is.

The The invention relates to an acoustic chamber, each with a tube for the supply and removal of a noise-generating volume of air and means for noise-optimizing change the chamber volume, in which advantageously the means of change the chamber volume of kink- or foldable areas of the chamber wall and / or the transition between the chamber and the tubes, by folding or unfolding the regions a reduction or increase in volume the chamber is effected.

Farther can in such a tube inserted a sudden expansion the pipe cross section are achieved; this creates similar positive acoustic effects as with a protruding tube, so that leaky cross-sectional extensions with a one-piece manufactured Component in Blasrohrverfahren advantageously produced are.

A Such acoustic chamber with the kink or foldable areas and the tubes can be advantageously manufactured as easy to produce Intake silencer used for an internal combustion engine become.

The inventive kink or foldable areas are in accordance with a first embodiment radially at the transition between the chamber and the tubes arranged so that in a simple way with a lateral Pulling at least one of the two tubes an enlargement of the Volume of the chamber and with a push in direction the chamber a reduction in the volume of the chamber is effected.

in this connection can pushing up towards the chamber also up into the interior of the chamber to make it even bigger To achieve volume reduction. Also, in an advantageous manner Make the kink or foldable areas so executed be that at least one pipe is nicked at a given angle is led out of the chamber to a flexible pipe deflection, in an arrangement in the engine compartment of an internal combustion engine or Noise optimization is often necessary to allow.

According to one second embodiment, the kink or foldable areas in the unfolded state a variable bulge or indentation on the chamber wall at any point, so that here too by pulling or pushing the kink or foldable areas a change in volume the chamber is easy to carry out.

The acoustic chamber can with the kinkable or foldable areas and the tubes advantageously in one piece as a blown part made of plastic or as an injection molded part.

In a production with a blowing process, a long stepped expansion of the chamber bottom and a larger expansion ratio can be achieved and the production is in Corruga Torprozess process as a stretched component in a simple manner feasible. In a production by injection molding also a defined adjustment of the beads of kinkable or foldable area is also possible in a two-piece housing with separate tubes.

Brief description of the drawings

The Invention will be with reference to the embodiments shown in the figures explained. Show it:

1 a view of an acoustic chamber produced as a blow part with kink- or foldable areas at transition areas to pipes,

1a and 1b Exemplary embodiments of the foldable regions as so-called slip-on hinges,

2 a view of an arrangement in which by volume in the chamber of the tube standing the volume is reduced,

3 a view of an arrangement in which a pipe is bent off,

4 a view of a manufactured as a molded part assembly and

5 an embodiment with an attached to the wall of the chamber additional kink- or foldable volume.

Embodiment (s) of the invention

In 1 is an integrally manufactured as a blown part acoustic chamber 1 with pipes 2 and 3 for supplying and discharging a noise-generating volume of air, for example as an intake silencer for an internal combustion engine. To the volume of the chamber 1 noise-optimizing to change, are kinkable or foldable areas 4 and 5 in the area of the transition from the chamber 1 to the pipes 2 and 3 arranged, wherein by folding or unfolding of the areas 4 and 5 a reduction or increase in the volume of the chamber 1 is feasible.

Likewise, due to the variable harmonic, gentle or erratic diameter transition from the pipe 2 or 3 in the chamber 1 an acoustic effect can be achieved. In the 1 is the bottom of the chamber 1 thus as a foldable transition between the chamber 1 and the pipes 2 and 3 realized in stretched form with a steady or gentle transition. The tube length or orientation can still here, for example, on the pipe 3 through another kink or foldable area 6 to be changed.

In 1a is the foldable area 4 with so-called Stülpscharnieren 4.1 shown by notches 4.3 in the wall of the foldable area 4 are formed and in 1b is the foldable area 4 with so-called Stülpscharnieren 4.2 shown by possibly cross-section reduced erected wall areas 4.4 in the wall of the foldable area 4 are formed.

According to the embodiment 2 is shown as radially at the transition between the chamber 1 and the pipes 2 with pushing in the pipes 2 and 3 in the direction of the chamber 1 a reduction in volume by folding or unfolding of the regions 4 and 5 initially by folding up from the starting position 4a (shown in phantom) and then by unfolding the areas 4 and 5 inside the chamber 1 in the final position 4b is feasible. The pipe 3 serves as an intake manifold for the combustion air and is also on the bendable or foldable area 6 nicked and the pipe 2 leads to the here not further explained internal combustion engine.

In 3 is shown as the kinkable or foldable area 5 designed so that the pipe 3 at a given angle kicks off the chamber 1 is herausführbar to chen ermögli a flexible pipe deflection. In the 2 and 3 is the bottom of the chamber 1 thus as a foldable transition between the chamber 1 and the pipes 2 and 3 in slipped form and realized here also with a sudden transition.

Out 4 can be seen as the chamber 1 is manufactured as a molded part and on the pipe 2 is turned up. The kink or foldable area 4 is also here as area 4a in the unfolded state outside and as 4b in the folded-in state schematically dash-dotted recognizable. The kinks of the kink or foldable area 4 Here, for example, are designed so that the thickness s of the buckling beads in the range of 0.3 mm.

According to another embodiment in 5 is a kink or foldable area 7 in the unfolded state as a variable bulge on the wall of the chamber 1 arranged so that here too by pulling or pushing the kink or foldable area 7 a change in the volume of the chamber 1 is feasible.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 19501411 A1 [0002]
• DE 102005031944 B4 [0003]
• - EP 1173819 A3 [0004]

Claims (11)

Acoustic chamber ( 1 ) each with a tube ( 2 . 3 ) for the supply and removal of a sound- producing air volume and means for changing the chamber volume, characterized in that the means for changing the chamber volume from kinkable or foldable areas ( 4 . 5 ; 7 ) the chamber wall and / or the transition between the chamber ( 1 ) and the pipes ( 2 . 3 ), wherein folding or unfolding of the regions ( 4 . 5 ; 7 ) a reduction or increase in the volume of the chamber ( 1 ) is feasible. Acoustic chamber according to claim 1, characterized in that the kinkable or foldable areas ( 4 . 5 ) radially at the transition between the chamber ( 1 ) and the pipes ( 2 . 3 ) are arranged such that with a lateral extraction of at least one of the two tubes ( 2 . 3 ) an increase in the volume of the chamber ( 1 ) and pushing it in the direction of the chamber ( 1 ) a reduction in the volume of the chamber ( 1 ) is feasible. Acoustic chamber according to claim 2, characterized in that pushing in towards the chamber ( 1 ) also in the interior of the chamber ( 1 ) he follows. Acoustic chamber according to claim 3, characterized in that by pushing it into the chamber ( 1 ) into the chamber ( 1 ) standing pipe can be produced. Acoustic chamber according to one of the preceding claims, characterized in that the transition from the chamber ( 1 ) in the pipes ( 2 . 3 ) is continuous, gentle or erratic. Acoustic chamber according to one of the preceding claims, characterized in that at least one tube ( 2 . 3 ) another kinkable or foldable areas ( 6 ) in the course of the tube length. Acoustic chamber according to one of the preceding claims, characterized in that the kinkable or foldable regions ( 4 . 5 . 6 ) are designed so that at least one pipe ( 3 ) at a predetermined angle from the chamber ( 1 ) is herausführbar. Acoustic chamber according to claim 1, characterized in that at least one kink- or foldable area ( 7 ) in the unfolded state a variable bulge or indentation on the wall of the chamber ( 1 ). Acoustic chamber according to one of the preceding claims, characterized in that the chamber ( 1 ) with the foldable or foldable areas ( 4 . 5 . 6 ; 7 ) and the pipes ( 2 . 3 ) is integrally made as a blown plastic. Acoustic chamber according to one of claims 1 to 6, characterized in that the chamber ( 1 ) with the foldable or foldable areas ( 4 . 5 ) and, where appropriate, the pipes ( 2 . 3 ) is made in one piece as an injection molded part made of plastic. Acoustic chamber according to one of the preceding claims, characterized in that the chamber ( 1 ) with the kinkable or foldable areas kinkable or foldable areas ( 4 . 5 . 6 ; 7 ) and the pipes ( 2 . 3 ) represents an intake silencer for an internal combustion engine.