# US 2014/0196977 A1 · Silencer and method for manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196977 A1 - Document ID: US20140196977A1 - Status: Published application - Kind: A1 - Application number: 14/151,945 - Filed: 2014-01-10 - Published: 2014-07-17 - Earliest claimed: 2013-01-16 - Assignees: Henn GmbH & Co KG. - Applicants: Henn GmbH & Co KG. - Inventors: Harald HARTMANN - Web page: https://patentgrep.com/patent/US20140196977A1 ## CPC - F02M 35/1283: {Manufacturing or assembly; Connectors; Fixations} - F01N 1/026: {Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage} - F02B 33/44: Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs - F02M 35/1266: {comprising multiple chambers or compartments} - Y10T 29/49398: Muffler, manifold or exhaust pipe making - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to a silencer (1), in particular a vehicle silencer, having a continuous pipe (2) as well as a first resonator chamber (14) and a second resonator chamber (15) each surrounding the pipe (2) and being arranged one behind the other, with the shell (3) of the pipe (2) having at least one first opening (7) which opens into the first resonator chamber (14), and at least one second opening, which opens into the second resonator chamber (15). In order to allow a more flexible manufacturability, the resonator chambers (14, 15) are formed from a first housing part (4) and a second housing part (5), each having a shell embodied around an axis, and the length of the shell of the one housing part (4; 5), as seen in axial direction, is at least the half of the length of the other housing part (5; 4), and the housing parts (4, 5) are slid inside each other and overlap their shells at least in parts, and in the overlapping region (6), the shell exterior face (4a) of the first housing part (4) rests against the shell interior face (5b) of the second housing part (5), and in at least the overlapping region (6), the shell exterior face (4a) of the first housing part (4) and the shell interior face (5b) of the second housing part (5) each have a constant cross-section as seen in axial direction, and the housing parts (4, 5) have a recess on each side facing away from the overlapping region (6), which recess the pipe (2) passes through. ## Claims ### Claim 1 Silencer (1), in particular a vehicle silencer, having a pipe (2) forming a flow duct and having a first resonator chamber (14) and a second resonator chamber (15), each surrounding the pipe (2) and being arranged one behind the other in axial direction, with the pipe (2) having in its shell (3) at least one first opening (7) which opens into the first resonator chamber (14), and at least one second opening (8) which opens into the second resonator chamber (15), wherein the resonator chambers (14, 15) are formed from a first housing part (4) and a second housing part (5) which each have a shell embodied around an axis, with—as seen in axial direction—the length of the shell of the one housing part (4; 5) being at least the half of the length of the shell of the other housing part (5; 4), and wherein the housing parts (4, 5) are slid inside each other and their shells overlap at least in parts, and in the overlapping region, the shell exterior face (4a) of the first housing part (4) rests against the shell interior face (5b) of the second housing part (5), and the shell exterior face (4a) of the first housing part (4) and the shell interior face (5b) of the second housing part (5) each have a constant cross-section as seen in axial direction, at least in the overlapping region (6), and wherein the housing parts (4, 5) each have a recess (21, 22) where the flow duct extends through. ### Claim 2 (depends on 1) Silencer according to claim 1, wherein the majorities of the sections of the shell exterior face (4a) of the first housing part (4) and the shell interior face (5b) of the second housing part (5) each have a constant cross-section as seen in axial direction. ### Claim 3 (depends on 1) Silencer according to claim 1, wherein the housing parts (4, 5) are each designed to be cylindrical, and the shell exterior face (4a) of the first housing part (4) and the shell interior face (5b) of the second housing part (5) each have a circular cross-section. ### Claim 4 (depends on 1) Silencer according to claim 1, wherein as seen in axial direction, the length of the shell of the one housing part (4; 5) is at least two thirds, preferably three quarters, of the length of the shell of the other housing part (5; 4), and it is particularly preferred that the shells of the housing parts (4, 5) are essentially of the same length. ### Claim 5 (depends on 1) Silencer according to claim 1, wherein at least in the overlapping region (6), preferably continuously, the shells of the housing parts (4, 5) have a constant shell thickness as seen in axial direction in each case. ### Claim 6 (depends on 1) Silencer according to claim 1, wherein the housing parts (4, 5) have an end face (9, 10) on each side facing away from the overlapping region (6), in which end faces the recesses (21, 22) for the passage of the pipe (2) are formed. ### Claim 7 (depends on 1) Silencer according to claim 1, wherein the housing parts (4, 5) are in each of their regions of their recesses (21, 22) connected to the pipe (2) in a manner airtight to the outside. ### Claim 8 (depends on 1) Silencer according to claim 1, wherein the housing parts (4, 5) are welded to each other in their overlapping region (6). ### Claim 9 (depends on 1) Silencer according to claim 1, wherein the shell of the one housing part (4) and the shell of the other housing part (5) each form a part of the external wall of the silencer (1). ### Claim 10 (depends on 1) Silencer according to claim 1, wherein the housing parts (4, 5) seal the resonator chambers (14, 15) in a manner airtight to the outside. ### Claim 11 (depends on 1) Silencer according to claim 1, wherein the shell lying outside in the overlapping region (6) has a beading (13) at its edge. ### Claim 12 (depends on 1) Silencer according to claim 1, wherein in one of the housing parts (5), a separating wall (20) is situated which separates the resonator chambers (14, 15) from each other, and the separating wall (20) has a recess for the passage of the pipe (2). ### Claim 13 (depends on 1) Silencer according to claim 1, wherein the housing parts (4, 5) are clamped between two profiles (16, 17) which are each situated at a pipe section (11, 12) extending outside the resonator chambers (14, 15). ### Claim 14 (depends on 1) Silencer according to claim 1, wherein the housing parts (4, 5) are made of sheet metal, preferably of stainless steel sheet. ### Claim 15 (depends on 1) Silencer according to claim 1, wherein the region of the pipe (2) surrounded by the resonator chambers (14, 15) is formed from a first part of pipe (2a) and a second part of pipe (2b) which are slid inside each other in their end regions, with the first housing part (4) surrounding the first part of pipe (2a), and the second housing part (5) surrounding the second part of pipe (2b). ### Claim 16 (depends on 15) Silencer according to claim 15, wherein at least one of the parts of pipe (2b) is formed to be integral with the housing part (5) surrounding it, and is preferably made of a deep-drawn piece of sheet metal. ### Claim 17 (depends on 16) Silencer according to claim 16, wherein the integrally formed part forms a projection (23) which rests against a pipe section (12) at least partially extending outside the resonator chambers (14, 15), and is held from outside by a profile (17), preferably a spring clip, so that the projection (23) is in radial direction arranged between the pipe section (12) and the profile (17). ### Claim 18 (depends on 15) Silencer according to claim 15, wherein the separating wall (20) is integrally formed with one of the parts of pipe (2a, 2b), preferably with the part of pipe (2a) slid on the other part of pipe (2b), and is preferably made of a deep-drawn piece of sheet metal. ### Claim 19 (depends on 1) Silencer according to claim 1, wherein at least one circumferentially extending sealing ring (24) is inserted in the overlapping section (6) between the shell exterior face (4a) of the first housing part (4) and the shell interior face (4b) of the second housing part (5). ### Claim 20 (depends on 19) Silencer according to claim 19, wherein in the shell of the first housing part (4) and/or in the shell of the second housing part (5), an annularly extending holding (25) for the sealing ring (24) is embodied, with the holding (25) being preferably formed from a bow-shaped course of the shell. ### Claim 21 (depends on 1) Vehicle (19), in particular a road vehicle, having a silencer (1), in particular a turbocharger silencer, which is arranged on the discharge side of a turbocharger (18), wherein the silencer (1) is a silencer according to claim 1. ### Claim 22 (depends on 1) Method for manufacturing a silencer according to claim 1, having a pipe (2) forming a flow duct as well as a first resonator chamber (14) and a second resonator chamber (15) each surrounding the pipe (2) and being arranged one behind the other, with the pipe (2) in its shell (3) having at least one first opening (7) which opens into the first resonator chamber (14), and at least one second opening (8), which opens into the second resonator chamber (15), wherein for forming the resonator chambers (14, 15), a first housing part (4) and a second housing part (5) are provided each having a recess (21, 22) for the flow duct, and a shell embodied around an axis, and which can be telescopically slid inside each other along the axis, with the length of the shell of the one housing part (4; 5), as seen in axial direction, being at least the half of the length of the shell of the other housing part (5; 4), and with the shell exterior face (4a) of the first housing part (4) resting against the shell interior face (5b) of the second housing part (5) in different telescopic positions, and wherein for forming the resonator chambers (14, 15) and for adjusting a defined resonator volume of a resonator chamber (15), the prefabricated housing parts (4, 5) are telescopically slid inside each other to a corresponding extent. ### Claim 23 (depends on 22) Method according to claim 22, wherein the housing parts (4, 5) are slid on the pipe (2), so that the pipe (2) passes through the recesses (21, 22) of the housing parts (4, 5). ### Claim 24 (depends on 22) Method according to claim 22, wherein the housing parts (4, 5) are welded to each other in their overlapping region (6) after the resonator volume of a resonator chamber (14) has been adjusted by sliding the housing parts (4, 5) into each other. ### Claim 25 (depends on 22) Method according to claim 22, wherein the prefabricated housing parts (4, 5) have an end face (9, 10) on each side facing away from the overlapping region (6), in which end face (9, 10) a recess (21, 22) corresponding to the external diameter of the pipe (2) is embodied, and wherein the housing parts (4, 5) are slid on the pipe (2) so that the at least one first opening (7) opens into the first resonator chamber (14) and the at least one second opening (8) opens into the second resonator chamber (15). ### Claim 26 (depends on 22) Method according to claim 22, wherein the housing parts (4, 5) are prefabricated as pot-shaped parts the bottoms of which have the recess (21, 22) for the passage of the flow duct. ### Claim 27 (depends on 22) Method according to claim 22, wherein one of the housing parts (5) is provided with a separating wall (20) which, in assembled state, separates the first resonator chamber (14) from the second resonator chamber (15). ### Claim 28 (depends on 22) Method according to claim 22, wherein in the region surrounded by the resonator chambers (14, 15), the pipe (2) is formed from a first part of pipe (2a) and a second part of pipe (2b) which are slid inside each other in their end regions, with the first housing part (4) surrounding the first part of pipe (2a) and the second housing part (5) surrounding the second part of pipe (2b). ### Claim 29 (depends on 28) Method according to claim 28, wherein at least one of the parts of pipe (2b) is formed to be integral with the housing part (5) surrounding it, preferably by deep-drawing a piece of sheet metal. ### Claim 30 (depends on 22) Method according to claim 22, wherein in the overlapping region (6) at least one circumferentially extending sealing ring (24) is inserted between the shell exterior face (4a) of the first housing part (4) and the shell interior face (5b) of the second housing part (5).