Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
  • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
  • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N1/00—Silencing apparatus characterised by method of silencing
  • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
  • F01N13/08—Other arrangements or adaptations of exhaust conduits
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
  • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
  • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
  • F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
  • F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L9/00—Rigid pipes
  • F16L9/21—Rigid pipes made of sound-absorbing materials or with sound-absorbing structure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N2310/00—Selection of sound absorbing or insulating material
  • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N2310/00—Selection of sound absorbing or insulating material
  • F01N2310/04—Metallic wool, e.g. steel wool, copper wool or the like

Definitions

• the invention relates to an exhaust silencer of the type comprising an inner pipe, permeable to gas in radial di ⁇ rection, an outer casing and possibly a noise-suppressing material arranged between the pipe and the outer casing, in the form of mineral wool or metal wool such a steel wool or the like.
• the invention also relates to a method of manufacturing such an exhaust pipe, particulary the inner pipe therefor.
• the known technology is represented by Swedish Patents No. 73 11 076-9 and No. 85 00 785-4 and British Patent No. 1 191 125.
• the basic idea is to produce a bendable exhaust silencer, but the previous designs have several drawbacks both as regards manufacture and also as regards forming the exhaust pipe to the desired shape to fit a particular model of vehicle.
• One object of the invention is to provide a new exhaust silencer and a new method of manufacturing it, and also to offer a method for quickly and easily manufacturing an exhaust pipe which as well as being bendable to the desired shape, is also able to substantially maintain its axial length when bent, and even maintain its cross section. Further aims and advantages of the invention are revealed in the following description or will be obvious to one skilled in the art who studies the description.
• an exhaust silencer of the type comprising an inner pipe, permeable to gas in radial direction, an outer casing and possibly a noise-suppressing material arranged between pipe and casing
• the exhaust pipe is charac ⁇ terised in that the inner pipe is formed from perforated rings of strip material, joined together axially, said rings when considered in axial section having outwardly concave cross section, with cross-sectional legs of diffe- rent lengths, the rings being flexibly jointed to each other, the longer flange of one ring being upset over the shorter flange of an adjacent ring.
• the pipe sections of the inner pipe preferably have an axial length which is less than their diameter.
• the pipe sections of the inner pipe are preferably connected together by means of upsetting, to form a joint of ball- and-socket type.
• the casing preferably consists of a curable material and is deformable prior to curing. It may comprise at least one layer produced from a strip material wound helically with partial overlap, e.g. metal strip material, with a curable adhesive between the turns in the overlap region.
• the casing may be arranged to be cured by the heat from the exhaust fumes after assembly in a motor vehicle.
• the curable material may be arranged to be cured by air moisture or the like, in which case the exhaust pipe is provided immediately after manufacture with an air-tight wrapping intended to prevent premature hardening of the curable material.
• a method of manufacturing an exhaust silencer comprises producing an inner pipe, permeable to gas in radial direc ⁇ tion, and providing it with a casing and possibly with a noise-suppressing material between pipe and casing.
• the method is characterised substantially in that the pipe is produced by manufacturing perforated, generally cylindrical rings out of strip material, e.g. metal strip material, said rings when considered in axial section having outwardly concave cross section, with cross-sectional legs of diffe ⁇ rent lengths, the rings being placed axially beside each other and being flexibly jointed to each other by the longer flange of one ring being upset over the shorter flange on an adjacent ring.
• the pipe sections preferably have an axial length which is less than their diameter.
• the cross-sectional structure of the pipe sections and said upsetting are designed to create a joint of ball-and- socket type. Suitable adjustment of the upset will offer a certain friction in the joint designed to permit deformation of the pipe to the desired shape, the exhaust pipe thus obtaining a suitable shape for its proposed location.
• the exhaust pipe can thus easily be fitted and subsequently fixed permanently.
• the exhaust pipe is made curable by means, for instance, of a curable material, so that its final shape is only fixed after the exhaust pipe has been fitted in its place of application. Curing may be arranged in conventional manner by means of heat from the exhaust fumes flowing through the pipe, or by means of moisture in the atmosphere surrounding the fitted exhaust pipe.
• Figure 1 shows schematically an axial section through the inner pipe in the exhaust pipe according to the invention, at the time of manufacture of this inner pipe
• Figure 2 shows schematically an axial section through an exhaust pipe according to the invention.
• the exhaust pipe according to the invention comprises an inner pipe 2, radially permeable to gas, a casing 4 surrounding the pipe 2 and a noise-suppressing material 3 arranged between the pipe 2 and the casing 4.
• the pipe 2 shown in Figure 1 is produced from generally cylindrical rings 10 of metal strip material. Seen in axial section, the rings have an outwardly concave cross section 5, the legs 6, 7 being of different lengths.
• the end of a new ring with larger diameter is passed over the end with smaller diameter on an adjacent ring, in the direction of the arrow 11.
• the flange 6 of larger diameter is then shrunk over the smaller flange 7 on the adjacent ring by means of a radially inwardly directed upsetting operation indicated by the arrows 12. Repetition of this process will gradually produce a pipe 2 of desired length.
• the flanges 6, 7 are dimensioned and shaped to give a joint of ball-and-socket type when subjected to the radial upsetting operation, thus allowing angular adjustment of adjacent rings 10 in relation to each other without sub ⁇ stantially altering their axial distance from each other.
• the rings 10 are provided with mult- iple perforations 8.
• the exhaust pipe is produced by possibly providing the prefabricated pipe 2 externally with a noise-suppressing material 3, such as a layer of mineral wool, steel wool or the like, possibly in the form of an unbroken layer, and then applying a casing 4.
• a noise-suppressing material 3 such as a layer of mineral wool, steel wool or the like, possibly in the form of an unbroken layer
• the casing 4 comprises a thin metal strip 41 wound helically with overlap 42 between adjacent turns.
• the strip 41 is provided at least in the overlap region with a curable adhesive 43.
• the adhesive 43 may be of thermosetting sype. It will then harden, thus solidifying the casing 4 and consequently the whole exhaust system, after the latter has been bent to the desired shape and fitted in the intended position, e.g. on a motor vehicle.
• a curable adhesive can be used of a type which hardens under the influence of a component from the surrounding athrnos- phere, such as moisture.
• the exhaust pipe should be provided with an air-tight wrapping immedi ⁇ ately after manufacture, to prevent premature hardening.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Exhaust Silencers (AREA)
• Joints Allowing Movement (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20372623

Family Applications (1)

Country Status (18)

Families Citing this family (7)

Family Cites Families (5)

• 1988
  • 1988-06-15 SE SE8802235A patent/SE461418B/sv not_active IP Right Cessation
• 1989
  • 1989-06-01 JP JP1506747A patent/JP2598144B2/ja not_active Expired - Lifetime
  • 1989-06-01 WO PCT/SE1989/000307 patent/WO1989012732A1/en not_active Application Discontinuation
  • 1989-06-01 HU HU893883A patent/HUT57874A/hu unknown
  • 1989-06-01 BR BR898907489A patent/BR8907489A/pt unknown
  • 1989-06-01 AU AU38337/89A patent/AU3833789A/en not_active Abandoned
  • 1989-06-01 EP EP89907334A patent/EP0426696A1/en not_active Withdrawn
  • 1989-06-08 GR GR890100381A patent/GR890100381A/el unknown
  • 1989-06-14 CN CN89104061A patent/CN1051410A/zh active Pending
  • 1989-06-14 NZ NZ229544A patent/NZ229544A/en unknown
  • 1989-06-14 PT PT90858A patent/PT90858A/pt not_active Application Discontinuation
  • 1989-06-14 IL IL90614A patent/IL90614A0/xx not_active IP Right Cessation
  • 1989-06-14 DD DD89329598A patent/DD287079A5/de not_active IP Right Cessation
  • 1989-06-14 ZA ZA894506A patent/ZA894506B/xx unknown
  • 1989-06-14 ES ES8902084A patent/ES2015712A6/es not_active Expired - Lifetime
• 1990
  • 1990-12-13 FI FI906134A patent/FI906134A0/fi not_active Application Discontinuation
  • 1990-12-14 DK DK297990A patent/DK297990A/da not_active Application Discontinuation
  • 1990-12-17 OA OA59923A patent/OA09585A/en unknown

Non-Patent Citations (1)

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