US3666037A - Motor vehicle exhaust pipes - Google Patents

Motor vehicle exhaust pipes Download PDF

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Publication number
US3666037A
US3666037A US75047A US3666037DA US3666037A US 3666037 A US3666037 A US 3666037A US 75047 A US75047 A US 75047A US 3666037D A US3666037D A US 3666037DA US 3666037 A US3666037 A US 3666037A
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United States
Prior art keywords
exhaust pipe
longitudinal axis
vehicle
bend
end piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US75047A
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English (en)
Inventor
Herbert Otto
Helmut Schonberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motors Liquidation Co
Original Assignee
General Motors Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Motors Corp filed Critical General Motors Corp
Application granted granted Critical
Publication of US3666037A publication Critical patent/US3666037A/en
Anticipated expiration legal-status Critical
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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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation

Definitions

  • MOTOR VEHICLE EXHAUST PIPES [72] Inventors: Herbert Otto, Russelsheim; Helmut Schonberger, Ginsheim, both of Germany [73] Assignee: General Motors Corporation, Detroit,
  • a motor vehicle exhaust pipe has an end piece which is formed as a nozzle and directed downwards and is also provided with an upwardly directed bend.
  • the upper vertex of the bend is arranged above the central axis of the exhaust pipe and the lower vertex is arranged in the region of the central axis.
  • the cross section of the end piece is constricted in nozzle-like fashion up to the termination of the bend and is constant up to the exit aperture.
  • This arrangement provides a rapid lead-away of the waste gases from the vicinity of the vehicle and thereby prevents soiling of the rear windows.
  • This invention relates to motor vehicle exhaust pipes and in particular to the end portion of a motor vehicle exhaust pipe.
  • the end portion of the exhaust pipe has an upwardly directed bend.
  • the upper wall of the pipe, at the vertex of the bend is arranged above the central axis of the exhaust pipe and the lower wall at the vertex is arranged in the region of the central longitudinal axis of the exhaust pipe.
  • the end portion is so designed that it is constricted in nozzle-like fashion in the region of the bend and has a constant cross section from the termination of the bend up to the outlet opening. This arrangement ensures that the exhaust gas is accelerated in the region of the bend and at the same time it is directed downwards with respect to the horizontal so that it emerges from the outlet opening with increased velocity.
  • the cross section of the outlet opening of the end portion is of elongated shape with its major axis lying parallel with the road.
  • the cross-sectional area of the exit aperture is about 75 percent of that of the cross section of the exhaust pipe.
  • the portion of the end piece formed with a constant cross section is directed downwards at an angle of about 35.
  • the end portion is provided with a cover pipe whose opening terminates flush with the outlet opening of the end portion or projects only slightly beyond it; the opening of the cover pipe is in a plane parallel to the plane of the outlet opening of the end portion.
  • FIG. 1 is a perspective view of the rear end of a motor vehicle with dual exhaust pipes the end portions of which are provided with cover pipes;
  • FIG. 2 is a side elevation of the end portion of one of the exhaust pipes
  • FIG. 3 is an end elevation of the end portion of the exhaust pipe of FIG. 2, as viewed in the direction of the arrow A;
  • FIG. 4 is a part sectional side elevation of the end portion of the exhaust pipe, the cover pipe being shown partially broken away.
  • FIG 1 shows the rear end 10 of a motor vehicle having a-bumper 11 with an over-rider 12, a housing 13 for a light for a number plate 14, and rear lights 15.
  • Protruding below the body 16 of the vehicle are the two end portions 21 ( Figures 2 and 4) of a pair of exhaust pipes 17, the end portions 21 having outlet openings 18 and cover pipes 19.
  • each exhaust pipe 17 has an end resonator silencer 20 which continues into the end portion 21 which has an upwardly directed bend 22 therein, the bend 22 having at its vertex an upper wall 23 which lies above and is spaced from the central longitudinal axis 24 of the exhaust pipe 17, and having a lower wall 25 which lies adjacent the longitudinal axis 24.
  • the bent portion 22 of the exhaust pipe continues into a downwardly inclined portion 26 which terminates in the outlet opening 18, the portion 26 of the pipe extending at an angle of approximately 35 to the longitudinal axis 24.
  • the end portion 21 of the exhaust pipe tapers, as shown, towards its junction with the bend 22 therein but the downwardly inclined portion 26 is of substantially constant cross-section.
  • the outlet 18 of the exhaust pipe is of substantially elliptical form, with the major axis thereof extending transversely, that is, parallel to the road, and with the upper wall of the outlet 18 intersecting the longitudinal axis 24.
  • the cover pipe 19 which encloses the silencer 20 and end portion 21 of the exhaust pipe has an end opening 28 the plane of which is preferably substantially parallel to the downwardly inclined plane of the outlet opening 18 of the end portion 21; and the plane of the outlet opening 18 is preferably spaced slightly inwardly of the outlet 28 by chstance of approximately 2 millimeters.
  • the cover pipe 19 ensures that the flow of exhaust gases is not broken oftat the outlet opening 18 of the end portion 21 of the exhaust pipe and that the flow of exhaust gases is conducted away, substantially undisturbed, in the wind shadow" of the cover pipe 19.
  • the cross-sectional area of the outlet opening 18 is approximately 75 percent of that of the exhaust pipe.
  • the exhaust gases are accelerated as they pass through the region of the bend 22 of the end portion 21 of the exhaust pipe 17 and at the same time the gases are directed downwardly at an angle to the horizontal.
  • the elongated form of the outlet opening 18 creates a ribbon shaped jet of exhaust gases, and the ratio between the cross-sectional area of the outlet opening 18 to that of the exhaust pipe ensures that there is only a slight obstruction to flow through the pipe and correspondingly only a slight reduction in the efiective power of the engine.
  • the selection of an angle of approximately 35 for the downwardly inclined portion 26 of the exhaust pipe assists in preventing the exhaust gases from passing into the negative pressure region rearwardly of the vehicle, the exhaust gases being directed under the tail vortex of the vehicle and thus being rapidly removed from the vicinity of the vehicle.
  • a motor vehicle comprising: an exhaust pipe having a longitudinal axis, said exhaust pipe adapted to be connected to the vehicle with said longitudinal axis extending substantially horizontally; an end piece on the exhaust pipe; an upwardly directed bend in a front section of said end piece having a gradually decreasing cross sectional area, said bend having an upper vertex arranged above said longitudinal axis and a lower vertex arranged in the vicinity of said longitudinal axis; and a terminal end of substantially constant cross-sectional area on a rear section of said end piece extending downwardly and rearwardly of said upper vertex and said lower vertex, said terminal end having a discharge opening below said longitudinal axis whereby the configuration and disposition of said bend and said terminal end direct exhaust gases flowing through the exhaust pipe under the tail vortex of the vehicle.
  • a cylindrical exhaust pipe through which exhaust gases flow, said exhaust pipe adapted to be connected to the vehicle with a lonsaid exhaust pipe, said terminal end extending downwardly and rearwardly from said walls to said discharge opening, said terminal end terminating below said longitudinal axis whereby the configuration and disposition of said nozzle and said terminal end are effective to direct said exhaust gases under the tail vortex developed when the vehicle is moving; and a cover pipe encircling said end piece and terminating substantially adjacent said discharge opening for providing a protective covering for the end piece.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
US75047A 1969-09-27 1970-09-24 Motor vehicle exhaust pipes Expired - Lifetime US3666037A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1948939A DE1948939C3 (de) 1969-09-27 1969-09-27 Endstück für die Auspuffleitung eines Kraftfahrzeuges

Publications (1)

Publication Number Publication Date
US3666037A true US3666037A (en) 1972-05-30

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ID=5746712

Family Applications (1)

Application Number Title Priority Date Filing Date
US75047A Expired - Lifetime US3666037A (en) 1969-09-27 1970-09-24 Motor vehicle exhaust pipes

Country Status (5)

Country Link
US (1) US3666037A (enrdf_load_stackoverflow)
DE (1) DE1948939C3 (enrdf_load_stackoverflow)
FR (1) FR2062578A5 (enrdf_load_stackoverflow)
GB (1) GB1264750A (enrdf_load_stackoverflow)
SE (1) SE358207B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5590523A (en) * 1994-06-10 1997-01-07 Fox; Bryce J. Flow focusing and mixing device
US6827173B2 (en) 2001-08-17 2004-12-07 Dr. Ing. H.C.F. Porsche Ag Exhaust system having a tail pipe arrangement and method of making same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2345515B (en) * 1999-01-06 2002-08-07 Rover Group Exhaust Finisher
DE10355472B4 (de) * 2003-11-27 2009-06-04 Daimler Ag Endrohrblende für eine Abgasanlage eines Kraftfahrzeugs
JP2008106630A (ja) * 2006-10-23 2008-05-08 Toyota Motor Corp 車載エンジンの排気装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2078420A (en) * 1936-03-09 1937-04-27 Ford Motor Co Motor vehicle
DE866150C (de) * 1940-04-26 1953-02-09 Auto Union A G Kraftfahrzeug mit windschluepfiger Verkleidung
US2674087A (en) * 1948-05-13 1954-04-06 Peters & Russell Inc Exhaust deflector
US2912198A (en) * 1955-08-19 1959-11-10 Int Harvester Co Motor vehicle exhaust muffler support means

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2078420A (en) * 1936-03-09 1937-04-27 Ford Motor Co Motor vehicle
DE866150C (de) * 1940-04-26 1953-02-09 Auto Union A G Kraftfahrzeug mit windschluepfiger Verkleidung
US2674087A (en) * 1948-05-13 1954-04-06 Peters & Russell Inc Exhaust deflector
US2912198A (en) * 1955-08-19 1959-11-10 Int Harvester Co Motor vehicle exhaust muffler support means

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5590523A (en) * 1994-06-10 1997-01-07 Fox; Bryce J. Flow focusing and mixing device
US6827173B2 (en) 2001-08-17 2004-12-07 Dr. Ing. H.C.F. Porsche Ag Exhaust system having a tail pipe arrangement and method of making same

Also Published As

Publication number Publication date
FR2062578A5 (enrdf_load_stackoverflow) 1971-06-25
DE1948939C3 (de) 1974-01-24
GB1264750A (enrdf_load_stackoverflow) 1972-02-23
DE1948939B2 (de) 1973-07-05
SE358207B (enrdf_load_stackoverflow) 1973-07-23
DE1948939A1 (de) 1971-04-15

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