Broad-band resonance silencer, in particular for a motor vehicle engine

Abstract

A broad-band resonance silencer has an at least two-part housing which is designed to receive an exhaust-or gas-conveying pipe, which defines, with a circumferentially surrounding pipe jacket with acoustic openings formed therein, a pipe interior, wherein the pipe, in its installed position, is enclosed by a damping chamber formed by the housing, which chamber is actively connected to the pipe interior via the acoustic openings, and wherein the housing includes two axially split housing half-shells. In order to broaden the scope of use of such a broad-band resonance silencer, it is proposed that the pipe be designed as an insert which includes a central pipe section with two end-side pipe ends, that the insert be designed such that it can be inserted into the housing half-shells of the housing, and that the broad-band resonance silencer includes at least one acoustic channel.

Claims

1. A broad-band resonance silencer comprising an at least two-part housing (2) which defines a silencer longitudinal axis and a silencer transverse axis, an exhaust gas-carrying or gas-carrying pipe (4.1) which is accommodated in the housing and which with a circumferentially surrounding pipe jacket with acoustic openings therein defines a pipe interior, wherein the pipe (4.1) in the installed position is enclosed by at least one damping chamber which is formed by the housing and which is operatively connected to the pipe interior by way of the acoustic openings (4.2), wherein the housing (2) comprises at least two housing portions, in particular two divided housing half-shells (2.1, 2.4), wherein the pipe (4.1) is in the form of a pipe insert body (4) which includes a central pipe portion with two front pipe ends, wherein the pipe insert body (4) is adapted to be inserted into the housing portions of the housing (2), wherein the damping chamber is subdivided into at least two resonance chambers by way of at least one insert bar (4.3), wherein the broad-band resonator can also be in the form of a Helmholtz resonator, wherein the at least one insert bar (4.3) is provided on the insert body (4) in one piece therewith, wherein the insert bar (4.3) also functions as a position fixing means for the pipe insert body in relation to the housing, wherein in addition to the broad-band resonator at least one acoustic passage (4.5, 4.6, 4.11, 4.12, 4.13, 4.15, 4.20) providing a tubular resonator volume is provided, the passage inlet opening (4.11, 4.12) of the acoustic passage is provided in the pipe insert body, and the acoustic passage (i) extends at least portion-wise spaced from the pipe jacket forming an intermediate space between the passage (4.5, 4.6, 4.11, 4.12, 4.13, 4.15, 4.20) and the pipe (4.1), and/or (ii) extends in the direction of the silencer longitudinal axis over a plurality of damping chambers.

2. A broad band resonance silencer according to claim 1 wherein the acoustic passage (4.11, 4.12) extends with its longitudinal extent at least portion-wise in the direction of the silencer longitudinal axis.

3. A broad band resonance silencer as set forth in claim 1 wherein the acoustic passage (4.11, 4.12) extends with its longitudinal extent at least portion-wise along the silencer transverse axis.

4. A broad-band resonance silencer as set forth in claim 1 wherein the acoustic passage (4.11, 4.12) is arranged in a portion of its longitudinal and/or transverse extent at a spacing relative to the pipe jacket.

5. A broad-band resonance silencer as set forth in claim 1 wherein the acoustic passage (4.11, 4.12) is arranged in a portion of its longitudinal and/or transverse extent at the housing inside wall.

6. A broad-band resonance silencer as set forth in claim 1 wherein the at least one acoustic passage extends in the edge region in the proximity of or adjoining the surrounding housing.

7. A broad-band resonance silencer as set forth in claim 1 wherein the acoustic passage has an end which is opposite to the inlet opening and which is at least substantially closed.

8. A broad-band resonance silencer as set forth in claim 1 wherein the acoustic passage passes through at least one insert bar (4.3) of the insert body and is preferably formed integrally on the insert bar.

9. A broad-band resonance silencer as set forth in claim 1 wherein at least one passage wall portion of the acoustic passage (4.5, 4.6) is provided by a partial region of the pipe insert body (4) and/or a partial region of the housing (2).

10. A broad-band resonance silencer as set forth in claim 1 wherein the acoustic passage at least with a partial region thereof is part of the insert body.

11. A broad-band resonance silencer as set forth in claim 1 wherein the passage wall of the acoustic passage (4.7, 4.8) is provided with a partial region on the insert body and with another partial region on the housing (2), wherein the two partial regions together form the respective acoustic passage.

12. A broad-band resonance silencer as set forth in claim 1 wherein the at least one passage wall (4.7, 4.8) is provided circumferentially on the pipe insert body (4).

13. A broad-band resonance silencer as set forth in claim 1 wherein a further acoustic passage (4.5, 4.6) is provided at least one pipe connection (2.2, 2.3).

14. A broad-band resonance silencer as set forth in claim 1 wherein the inlet opening (4.11, 4.12) or passage opening is larger than the other acoustic openings.

15. A broad-band resonance silencer as set forth in claim 14 wherein the inlet opening (4.11, 4.12) or passage opening and the cross-section of the acoustic passage are of substantially the same geometry, in particular the same cross-section.

16. A broad-band resonance silencer as set forth in claim 1 wherein the acoustic passage (4.5, 4.6) includes a passage separation wall (4.18, 4.19, 4.23, 4.24).

17. A broad-band resonance silencer as set forth in claim 1 wherein a passage separation wall (4.18, 4.19, 4.23, 4.24) can be inserted into the acoustic passage.

18. A broad-band resonance silencer as set forth in claim 17 wherein the passage separation wall (2.8, 4.23, 4.24) is adapted to be insertable at different locations in the acoustic passage (4.5, 4.6).

19. An engine or turbocharger of an internal combustion engine with a broad-band resonance silencer as set forth in claim 1 in the air guide system, in particular air induction system, of same.

20. A method of noise damping using a broad-band resonance silencer or an engine or turbocharger of an internal combustion engine having the broad-band resonance silencer, wherein in addition to broad-band damping the at least one or each acoustic passage has a or precisely one passage inlet opening, through which the fluid or gas flows thereinto and is closed at the end to function as a lambda/4 passage or a lambda/2 passage, and wherein the broad-band resonance silencer comprises an at least two-part housing (2) which defines a silencer longitudinal axis and a silencer transverse axis, an exhaust gas-carrying or gas-carrying pipe (4.1) which is accommodated in the housing and which with a circumferentially surrounding pipe jacket with acoustic openings therein defines a pipe interior, wherein the pipe (4.1) in the installed position is enclosed by at least one damping chamber which is formed by the housing and which is operatively connected to the pipe interior by way of the acoustic openings (4.2), wherein the housing (2) comprises at least two housing portions, in particular two divided housing half-shells (2.1, 2.4), wherein the pipe (4.1) is in the form of a pipe insert body (4) which includes a central pipe portion with two front pipe ends, wherein the pipe insert body (4) is adapted to be inserted into the housing portions of the housing (2), wherein the damping chamber is subdivided into at least two resonance chambers by way of at least one insert bar (4.3), wherein the broad-band resonator can also be in the form of a Helmholtz resonator, wherein the at least one insert bar (4.3) is provided on the insert body (4) in one piece therewith, wherein the insert bar (4.3) also functions as a position fixing means for the pipe insert body in relation to the housing, wherein in addition to the broad-band resonator at least one acoustic passage (4.5, 4.6, 4.11, 4.12, 4.13, 4.15, 4.20) providing a tubular resonator volume is provided, the passage inlet opening (4.11, 4.12) of the acoustic passage is provided in the pipe insert body, and the acoustic passage (i) extends at least portion-wise spaced from the pipe jacket forming an intermediate space between the passage (4.5, 4.6, 4.11, 4.12, 4.13, 4.15, 4.20) and the pipe (4.1), and/or (ii) extends in the direction of the silencer longitudinal axis over a plurality of damping chambers.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, there are shown in the drawings embodiments which are presently preferred. It should be understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown.

(2) In the drawings:

(3) FIG. 1 shows an isometric exploded view longitudinally of the broad-band resonance silencer according to the invention,

(4) FIG. 2 shows an isometric plan view of the broad-band resonance silencer with the upper half-shell removed,

(5) FIG. 3 shows a longitudinal section of the broad-band silencer shown in FIG. 2,

(6) FIG. 4 shows an enlarged view of the inlet end at the right-hand side in FIGS. 1 to 3 of the broad-band resonance silencer,

(7) FIG. 5 shows an isometric end cross-section of the inlet end of the broad-band resonance silencer,

(8) FIG. 6 shows the broad-band resonance silencer of FIG. 1 in the installed position with the upper half-shell removed to show the main acoustic passage,

(9) FIG. 7 shows the view of FIG. 6 with separation walls fitted into the main acoustic passage, and

(10) FIG. 8 illustrates an alternative embodiment of the broad-band resonance silencer with acoustic passages provided on different planes.

DETAILED DESCRIPTION OF THE INVENTION

(11) Accordingly the broad-band resonance silencer includes substantially a two-part housing 2 in the form of a plastic injection molding for insertion or receiving the pipe insert body 4. Optionally however the housing can also comprise more than two half-shells.

(12) In the present embodiment the broad-band resonance silencer includes a two-part housing 2 having a silencer longitudinal axis and a silencer transverse axis, an exhaust gas-carrying or gas-carrying pipe 4.1 which is accommodated in the housing and which with a circumferentially surrounding pipe jacket with acoustic openings therein defines a pipe interior, wherein the pipe 4.1 in the installed position is enclosed by at least one damping chamber formed by the housing, being operatively connected to the pipe interior by way of the acoustic openings 4.2. In the present case the housing 2 includes two housing portions in the form of two housing half-shells 2.1, 2.4. According to the invention in all embodiments the pipe 4.1 is in the form of a pipe insert body 4 including a central pipe portion with two front pipe ends. The insert body 4 is designed to be inserted into the housing portions of the housing and the broad-band resonance silencer has at least one acoustic passage 2.6, 4.5, 4.6, 4.13, 4.15, 4.20. In addition the damping chamber is subdivided by way of at least one insert bar 4.3 into at least two resonance chambers and the at least one insert bar 4.3 is provided on the insert body 4 in one piece therewith. The insert bar 4.3 also functions as a position fixing means. Finally the at least one acoustic passage includes an inlet opening 4.11, 4.12 provided in the pipe insert body.

(13) The housing 2 includes a substantially trough-shaped housing lower shell 2.1 having a central receiving region for receiving the pipe insert body 4, into which therefore the pipe insert body 4 can be inserted in such a way that the pipe ends of the pipe 4.1 of the pipe insert body 4 end with the pipe connections 2.2, 2.3 of the housing lower shell 2.1, which connections are in the form of connecting unions and are in one piece.

(14) The housing lower shell 2.1 can be media-tightly closed by way of a housing upper shell 2.4 of a roof-shaped configuration, for which purpose the housing lower shell 2.1 in the outer edge region has a circumferential closed insertion groove 2.5 into which a sealing bar of complementary configuration on the housing upper shell 2.4 engages in media-tight relationship in the installed position.

(15) The pipe insert body 4 therefore includes a central pipe 4.1 which extends along the longitudinal axis and which includes an outer pipe jacket surface, in which a plurality of acoustic openings 4.2 (only one thereof is provided with a reference numeral) are provided in circumferentially distributed relationship at various locations.

(16) In addition the pipe insert body 4 at the lower end includes radially projecting insert bars 4.3 (only one is denoted by a reference numeral) which are spaced from each other in the longitudinal direction and extend transversely relative to the longitudinal direction of the system and which in the installed position can be inserted into insertion grooves 2.5 (only one is denoted by a reference numeral) provided at the inside on the housing lower shell 2.1. This ensures that the pipe insert body 4 is fixed in the desired position in the installed position within the housing 2 because therefore the insert bars 4.3 engage into the grooves 2.5 to fix the position and thus also terminate the ends of the pipe 4.1 of the pipe insert body 4 with the inside of the pipe connections 2.2, 2.3 of the housing lower shell 2.1 in media-carrying relationship.

(17) In general however it is also possible to provide only one such insert bar so that the silencer therefore has only two resonance chambers.

(18) Referring to FIGS. 1 and 2 provided on the top side of the pipe insert body are two acoustic passages 4.5, 4.6, more specifically an outer acoustic passage 4.5 and an inner acoustic passage 4.6 which are formed by passage walls 4.7, 4.8 which project radially in one piece at the outside of the pipe 4.1 of the pipe insert body 4 and which extend relative to the outer edge of the pipe insert body 4 in mutually spaced relationship circumferentially along the edge in such a way that provided therefore between them and the surrounding housing 2 in radially spaced relationship are the circumferential acoustic passages 4.5, 4.6 which in the present case are of approximately the same width, of which however the inner acoustic passage is correspondingly shorter.

(19) In general however there can also be only one acoustic passage or more than two.

(20) Besides the actual acoustic openings 4.2 the pipe insert body 4 therefore includes at the right-hand proximal inlet end in the Figures inlet openings 4.11, 4.12 in the form of slots 2.7 for the acoustic passages, through which the medium can pass from the pipe interior into the respective acoustic passage 4.5, 4.6 and issue again therefrom.

(21) As can be seen in particular from the enlarged views of the pipe connection 2.2 in FIGS. 4 and 5 circumferentially extending acoustic passages 2.6 can be provided in pipe connections 2.2, 2.3, which connections therefore form an annular space circumferentially surrounding the pipe connection 2.2, which is formed on the inside by the pipe connection 2.2, and in which there is provided an inlet opening also in the form of a slot 2.7, and externally by a ring fitment 6 which can be snap-fitted on to the pipe connections 2.3, 2.4 in such a way that further acoustic passages can be formed between the ring fitment 6 and the pipe connection 2.2, 2.3 around the pipe connections 2.2, 2.3.

(22) A separation wall 2.8 which is inserted into that acoustic passage 2.6 and extends transversely relative to the longitudinal direction thereof defines the length of the acoustic passage 2.6.

(23) In the alternative configuration shown in FIG. 6 provided on the pipe insert body 4 is only one circumferential acoustic passage 4.13 formed by a circumferential passage wall 4.14.

(24) The further embodiment shown in FIG. 7 also has only one circumferential acoustic passage 4.15 on the outer surface of the pipe insert body 4. This however is of a two-part configuration and includes two inlet openings in the form of slots 4.16, 4.17 which are separated from each other by an insertable separation wall 4.18 at the inlet end and are separated from each other at the end by a further separation wall 4.19. In that way the portion of the acoustic passage 4.15 which is the lower portion in FIG. 7 is however only approximately half as long as the portion of the acoustic passage 4.15 which is the upper portion in FIG. 7. That pipe insert body 4 can be particularly easily adapted to different frequency ranges by re-fitment of the separation wall 4.19 at different locations.

(25) Finally FIG. 8 shows an isometric plan view of an embodiment of a broad-band resonance silencer with an acoustic passage 4.20 which is in part provided on two planes and which again includes a plurality of acoustic passage portions. The upper planes visible in FIG. 8 of the two acoustic passage portions each have an associated inlet opening in the form of a slot 4.21, 4.22 and a separation wall 4.23 therebetween. Those acoustic passage portions are again defined by a separation wall 4.24 which ends the two portions.

(26) In addition this embodiment includes a diagrammatically indicated blind hole 4.25 which extends vertically, that is to say transversely relative to the longitudinal direction, and which represents a prolongation for the compensation of further frequencies. In a further embodiment this blind hole can be fluidically connected to a concealed acoustic passage portion arranged therebeneath, which permits further design configuration options for frequency compensation on an extremely limited structural space.

(27) The subject of the present invention is afforded not only by the subject-matter of the individual claims but the combination of the individual claims with each other. All features and details disclosed in the documents, including the Abstract, in particular the spatial configuration shown in the drawings, are claimed as being essential to the invention insofar as they are novel individually or in combination over the state of the art.

(28) It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.