US1452435A - Exhaust silencer for internal-combustion engines - Google Patents

Exhaust silencer for internal-combustion engines Download PDF

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Publication number
US1452435A
US1452435A US373038A US37303820A US1452435A US 1452435 A US1452435 A US 1452435A US 373038 A US373038 A US 373038A US 37303820 A US37303820 A US 37303820A US 1452435 A US1452435 A US 1452435A
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Prior art keywords
silencer
exhaust
internal
chamber
combustion engines
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US373038A
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Cyril G Pullin
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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 ; 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
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/1855—Mechanical joints the connection being realised by using bolts, screws, rivets 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/24—Methods or apparatus for fitting, inserting or repairing different elements by bolts, screws, rivets 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/10—Tubes having non-circular cross section
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus

Definitions

  • This invention relates to exhaust silencers for internal combustion engines and has particular reference to that type of engine working on the two-stroke principle.
  • the silencing of a small two-stroke petrol engine is an entirely different proposition to that to be dealt with in a four-stroke cycle engine.
  • the exhaust is expelled by the positive stroke of the piston, which practically expels the exhaust gas from the cylinder, and further allows the use of a silencing means having a heavy internal resistance to the passage of the gas.
  • the inlet for the exhaust gases opens into the large end of a tapering chamber, the gases being then converged by the tapering contour of the chamber, whereon a high velocity for the gases is obtained, the gases then being directed into the large end of a second tapering chamber and so on through a required plurality of compartments tapered longitudinally and disposed so that the large end of the first compartment adjoins the exhaust connection and the smaller end of the same compartment connects with the large end of the next compartment, the outlet pipe of the cylinder communicating with the small end of the last of said compartments.
  • Fig. 1 is a perspective view of the silencer
  • Fig. 2 is a perspective view of the member (detached) which dito allow the maximum vides the interior of the silencer into compartments
  • Fig. 3 is a View of the end cap of the silencer.
  • the silencer 1 comprises two tapering compartments 2 and 3 formed by the single V-shaped one-piece baffle 4 disposed within the rec.- tangular body of the silencer 1, and this baffle piece at is so disposed therein as to leave a third narrow chamber or compartment 5 between one of its limbs and the wall of the body of the silencer.
  • the baffle plate 1 is fixed in position in the silencer body by any convenient means 1inch as for instance by welding it to the Ifito the large end of the first compartment'2 there leads the inlet pipe 6 for the introduction of the exhaust gases, which on entering the tapering chamber 2 proceed to the narrow end thereof, and then pass through perforations in the end of one limb of the V-shaped baffle and enter the large end of the second tapering compartment 3. The gases again proceed to the narrow end of this chamber and pass out by way of the perforations 8 in the adjacent end of the second limb of the V-shaped baflle, into the chamber or compartment 5 between the sine of the silencer body and the bafiie.
  • the exhaust gases pass out of the silencer by an opening or slit 9 made in the cap 10 which fits over the end of the silencer body 1.
  • This cap is secured to the body by means of a bolt 11 passing through eyes 12 in opposite flanges of the cap 10 and through holes in the ends of opposite sides of the body 1 and bolt 11 is secured in position by a nut 16.
  • the bolt 11 also passes through the ends of the V-shaped baffle 41:.
  • a sleeve 17 which serves as a distance piece between the opposite sides of the body 1, and this sleeve 17 is also held in position by means of a short eye bolt 13 which passes through a hole 18 in the head of the cap, the eye 14 of the bolt embracing the sleeve 17, and has a wing nut 15 screwed over its outer end tight down on the cap 10.
  • the cap above described may be fitted to either end of the silencer, and it facilitates cleaning or inspection of the silencer, being easily removable.
  • An exhaust silencer for internal combustion engines comprising a casing, a battle thereindividing the casing internally into two chambers each with'awide end 'and'a narrow end, the wide end of one chamber adjoiningthe narrow end of the other, a
  • An exhaust'silencer for internal combnstion' engines comprising a casing, a V- 'shaped bafiie thereinso disposed that 1t d1- vides'the casing internally into three chambers, two of which each have a wide end and a narrow end, the wide end of one chamber adjoining the nar'row' end of the other, a port admitting. exhaust gases to the wide end of onechaimber, a port between the narrow end of that chamber and the wide end o f'the adjoining chamber, and a port from ,the narrow end of thesecond chamber into the third chamber.
  • LAn exhaust silencer for internal combustionengines comprising a casing, a V- shaped baffle therein disposed with one limb oblique to the adjoining side of the casing and the second limb substantially parallel to the opposite side or" the casing, and dividing the casing internally into three chambers, two tapering and one substantially of even sectional area throughout.
  • An exhaust silencer for internal combustion engines comprising acasing, bafiies therein dividing the easing into three chambers two of which are tapering and a detachable cap over one end of the casing haviing an opening in it through which the gases 7.
  • An exhaust silencer for internal "com-" bustion 1 engines comprising a casing, a i V- shaped bafiie therein, so'disposedthat the casing is divided into three compartments, two adjacent tapering compartments, and-a third ofsubstantially even sectional area throughout port admitting exhaust gases to the wide 'end ofone tapering compartment, openings in said baflle connecting the smaller end of the last mentioned tapering compartment to the large'end of the other tapering compartment openings in the said battle connecting the'smaller end of the said other tapering compartment with the third compartment of even sectional area, a detachable cap on'the outlet end' 'of said casin-g, means adapted to secure the caps to the casing, spacing 'means adjacent the cap between'the opposite walls of the casing, and an outlet opening insaid cap registering with the outlet end of said compartment of "even sectional area.

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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)

Description

C. G. PUL-LIN EXHAUST SILENCER FOR INTERNAL} COMBUSTION ENGINES Apr. 7,, 1923.
Filed April 12 1920 Patented Apr. 17, 1923.
UNITED STATES CYRIL G. PULLIN, OF ISLEWORIH, ENGLAND.
EXHAUST SILENCER FOR INTERNAL-COMBUSTION ENGINES.
Application filed April 12, 1820. Serial No. 373,038.
To all 107mm 2'25 may concern:
Be it known that 1, cm GEORGE PULLIN, a subject of the King of Great Britain, residing at Isleworth, Middlesex, England, have invented certain new and useful Improvements in or Relating to Exhaust Silencers for Internal-Combustion Engines, of which the following is a speci fication.
This invention relates to exhaust silencers for internal combustion engines and has particular reference to that type of engine working on the two-stroke principle.
The silencing of a small two-stroke petrol engine is an entirely different proposition to that to be dealt with in a four-stroke cycle engine. On the four-stroke cycle engine the exhaust is expelled by the positive stroke of the piston, which practically expels the exhaust gas from the cylinder, and further allows the use of a silencing means having a heavy internal resistance to the passage of the gas.
On a tw0-stroke cycle engine, the exhaust is expelled from the cylinder by the relatively feeble blast of the incoming charge; to obtain therefore the required cooling and the maximum silencing effect for the en gine it is necessary quantity of fresh uel to enter the cylinder, that is, the exhaust and silencing arrangement must be as free as possible.
Now according tothe present invention I provide a silencer in which the inlet for the exhaust gases opens into the large end of a tapering chamber, the gases being then converged by the tapering contour of the chamber, whereon a high velocity for the gases is obtained, the gases then being directed into the large end of a second tapering chamber and so on through a required plurality of compartments tapered longitudinally and disposed so that the large end of the first compartment adjoins the exhaust connection and the smaller end of the same compartment connects with the large end of the next compartment, the outlet pipe of the cylinder communicating with the small end of the last of said compartments.
One construction of exhaust silencer embodying the present invention is illustrated by way of example in the accompanying drawings, in which Fig. 1 is a perspective view of the silencer, Fig. 2 is a perspective view of the member (detached) which dito allow the maximum vides the interior of the silencer into compartments, and Fig. 3 is a View of the end cap of the silencer.
In the construction here illustrated the silencer 1 comprises two tapering compartments 2 and 3 formed by the single V-shaped one-piece baffle 4 disposed within the rec.- tangular body of the silencer 1, and this baffle piece at is so disposed therein as to leave a third narrow chamber or compartment 5 between one of its limbs and the wall of the body of the silencer.
The baffle plate 1 is fixed in position in the silencer body by any convenient means 1inch as for instance by welding it to the Ifito the large end of the first compartment'2 there leads the inlet pipe 6 for the introduction of the exhaust gases, which on entering the tapering chamber 2 proceed to the narrow end thereof, and then pass through perforations in the end of one limb of the V-shaped baffle and enter the large end of the second tapering compartment 3. The gases again proceed to the narrow end of this chamber and pass out by way of the perforations 8 in the adjacent end of the second limb of the V-shaped baflle, into the chamber or compartment 5 between the sine of the silencer body and the bafiie.
From the narrow chamber 5 the exhaust gases pass out of the silencer by an opening or slit 9 made in the cap 10 which fits over the end of the silencer body 1. This cap is secured to the body by means of a bolt 11 passing through eyes 12 in opposite flanges of the cap 10 and through holes in the ends of opposite sides of the body 1 and bolt 11 is secured in position by a nut 16. The bolt 11 also passes through the ends of the V-shaped baffle 41:.
Externally of the bolt 11 there is arranged a sleeve 17 which serves as a distance piece between the opposite sides of the body 1, and this sleeve 17 is also held in position by means of a short eye bolt 13 which passes through a hole 18 in the head of the cap, the eye 14 of the bolt embracing the sleeve 17, and has a wing nut 15 screwed over its outer end tight down on the cap 10.
The cap above described may be fitted to either end of the silencer, and it facilitates cleaning or inspection of the silencer, being easily removable.
I claim:
1. An exhaust silencer for internal combustion engines comprising a casing, a battle thereindividing the casing internally into two chambers each with'awide end 'and'a narrow end, the wide end of one chamber adjoiningthe narrow end of the other, a
port a'dmittingiexhaus t gases to the wide 'end of one chamber and a port between the narro w end ofthat'chamber and the wide end of theadjoining chamber.
3. An exhaust'silencer for internal combnstion' engines comprising a casing, a V- 'shaped bafiie thereinso disposed that 1t d1- vides'the casing internally into three chambers, two of which each have a wide end and a narrow end, the wide end of one chamber adjoining the nar'row' end of the other, a port admitting. exhaust gases to the wide end of onechaimber, a port between the narrow end of that chamber and the wide end o f'the adjoining chamber, and a port from ,the narrow end of thesecond chamber into the third chamber.
LAn exhaust silencer for internal combustionengines comprising a casing, a V- shaped baffle therein disposed with one limb oblique to the adjoining side of the casing and the second limb substantially parallel to the opposite side or" the casing, and dividing the casing internally into three chambers, two tapering and one substantially of even sectional area throughout.
5. An exhaust silencer for internal combustion engines comprising acasing, bafiies therein dividing the easing into three chambers two of which are tapering and a detachable cap over one end of the casing haviing an opening in it through which the gases 7. An exhaust silencer for internal "com-" bustion 1 engines comprisinga casing, a i V- shaped bafiie therein, so'disposedthat the casing is divided into three compartments, two adjacent tapering compartments, and-a third ofsubstantially even sectional area throughout port admitting exhaust gases to the wide 'end ofone tapering compartment, openings in said baflle connecting the smaller end of the last mentioned tapering compartment to the large'end of the other tapering compartment openings in the said battle connecting the'smaller end of the said other tapering compartment with the third compartment of even sectional area, a detachable cap on'the outlet end' 'of said casin-g, means adapted to secure the caps to the casing, spacing 'means adjacent the cap between'the opposite walls of the casing, and an outlet opening insaid cap registering with the outlet end of said compartment of "even sectional area.
In te'stimony'whereof I aflix my signature.
CYRILv G. PULLIN.
US373038A 1920-04-12 1920-04-12 Exhaust silencer for internal-combustion engines Expired - Lifetime US1452435A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902109A (en) * 1952-08-27 1959-09-01 Gen Motors Corp Silencer for pulsating gaseous currents
US20060055188A1 (en) * 2003-02-26 2006-03-16 Michael Koch Load-receiving device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902109A (en) * 1952-08-27 1959-09-01 Gen Motors Corp Silencer for pulsating gaseous currents
US20060055188A1 (en) * 2003-02-26 2006-03-16 Michael Koch Load-receiving device

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