GB1565374A - Apparatus for the exit and silencing of the exhaus gases from an internal combustion engine for example a petrol engine - Google Patents

Apparatus for the exit and silencing of the exhaus gases from an internal combustion engine for example a petrol engine Download PDF

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Publication number
GB1565374A
GB1565374A GB4897876A GB4897876A GB1565374A GB 1565374 A GB1565374 A GB 1565374A GB 4897876 A GB4897876 A GB 4897876A GB 4897876 A GB4897876 A GB 4897876A GB 1565374 A GB1565374 A GB 1565374A
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United Kingdom
Prior art keywords
conduit
chamber
pipe
gas
casing
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
Application number
GB4897876A
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.)
BAZZATO G
MENON L
Original Assignee
BAZZATO G
MENON L
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
Priority claimed from IT8255175A external-priority patent/IT1056390B/en
Priority claimed from IT8253376A external-priority patent/IT1073548B/en
Application filed by BAZZATO G, MENON L filed Critical BAZZATO G
Publication of GB1565374A publication Critical patent/GB1565374A/en
Expired legal-status Critical Current

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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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • 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

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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

(54) AN APPARATUS FOR IMPROVING THE EXIT AND SILENCING OF THE EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE, FOR EXAMPLE A PETROL ENGINE (71) We, MENON LUIGI and BAZZATO GIULIA of Italian nationality, of Via S. Rocco, 3-Roncade, Italy, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to an apparatus to be mounted on the exhaust pipe of internal combustion engines, for example petrol engines, in order to reduce the pressure on the cylinder piston, taking advantage of the kinetic energy of said exhaust gases and acting, at the same time, as a silencer.
According to the present invention there is provided an apparatus for improving the exit and silencing of the exhaust gases from an internal combustion engine comprising: a) a cylindrical casing having two end walls, one end wall providing a gas inlet connectible to an exhaust pipe of the engine and a gas outlet being provided in the other end wall.
b) a central conduit extending substantially along the length of said cylindrical casing coaxial with said inlet and outlet to provide a gas path between said inlet and said outlet, one end of said conduit being adjacent said inlet to receive a portion of the exhaust gas, said central conduit having a plurality of apertures along a proportion of its length from its one end, c) a chamber formed between said casing and said central conduit, a portion of said chamber acting as an expansion chamber being arranged to receive the portion of the exhaust gas not received by the conduit one end and from which the said portion of exhaust gas not received by the conduit is returned into said central conduit through at least said apertures, the remaining portion of said chamber acting as an expansion box with receives and returns gas from the expansion chamber, said central conduit being shaped to create an ejector effect whereby exhaust gas is removed at least in part from said expansion chamber through said apertures into said conduit to said outlet.
The apparatus of the invention may further comprise means to control the proportion of gas entering the conduit and expansion chamber, according to the characteristics of the engine to which the apparatus will be applied. This may be achieved if the exhaust pipe of the engine is connectable with the casing inlet end wall by means of a pipe union, said pipe union being axially extendable into said inlet end wall toward said conduit end adjacent said inlet so as to vary the distance between said pipe union and conduit end thereby controlling the proportion of gas entering the conduit and expansion chamber.
In a first embodiment of the present invention, the said conduit comprises an apparatus wherein said conduit comprises first and second cylindrical portions, the first portion being of larger diameter than the second portion, said first and second portions being connected by a frustoconical pipe portion. the first portion being provided with a plurality of apertures in the form of radial holes leading into said expansion chamber and having a concentric pipe therein, of smaller diameter than said second portion, which extends into said frusto-conical pipe portion, said second portion of said conduit having a tapered end, said conduit further including a discharge pipe mounted to the gas outlet wall having an inlet orifice into which enters said tapered end, the flow of the gas in the conduit through said frusto-conical pipe portion and said tapered end causing respective eiector effects such, that gas is drawn into said conduit from said expansion chamber.
In a second embodiment of the present invention, a portion of said conduit comprises a plurality of frusto-conical coaxial walls converging in the direction of the outlet end wall of said casing providing apertures leading into said expansion chamber, flow of gas in the conduit past said frusto-conical walls providing an ejector effect such that gas is drawn from said expansion chamber and expansion box into said conduit, the remaining portion of said conduit having extending through said outlet end wall of the casing, the apparatus further including a silencing chamber formed between the casing and a portion of the conduit and between said expansion box and the casing end wall, said conduit being provided with holes therein to allow gas to enter said silencing chamber. A similar silencing chamber could be provided in the first embodiment mentioned above.
The apparatus of the invention reduces the pressure of the exhaust gases so that said pressure reduction of the exhaust gases will also reduce the pressure acting on the surface of the cylinder piston. As a result an improved efficiency of the engine, a less consumption of fuel, an easier pickup and higher speeds at an equal fuel consumption are attained.
Other characteristics and advantages of this invention will be better understood from the following description taken in consideration together with the accompanying drawing in which: Figure 1 is an axial sectional view of a first embodiment of the apparatus of the invention; and Figure 2 is a second embodiment which also includes a sound deadening device, the central conduit being shown partly in axial section, and partly in side view.
Referring to the Figure 1, the apparatus is constituted of a cylindrical hollow casing I having end walls la and 1b and connected through its inlet end wall la to the exhaust pipe 2 of the engine cylinder (not shown) and at its opposite outlet end wall lb to a discharge pipe 3 through which the gases flow out in the atmosphere.
Said casing 1 is separated in two coaxial chambers 4 and 5. The chambers 4 and 5 together act as an expansion chamber. The chambers 4 and 5 freely communicate one with the other.
Within the casing 1 is mounted an axial central conduit supported by radial spacing bars 6 or the like by the casing 1, the conduit comprising a first portion 9 positioned in the chamber 4 and partly in chamber 5 and which is provided with radial holes 10 by means of which it is put in communication with the chambers 4 and 5. The inlet orifice 9a of the portion 9 of the central conduit is coaxial with, but spaced apart from the outlet orifice 2a of the exhaust pipe 2 entering into the casing 1 so that a part of the exhaust gases pass and expand into the chamber 4 and then in the chamber 5.
another part directly enters the central conduit. In the portion 9 is mounted a section of pipe 11 having solid wall and of a diameter less than that of the cylindrical portion 9, the inlet orifice I la of which is coaxial but spaced apart from the outlet orifice 2a at a less distance than the inlet orifice 9a of the portion 9. The cylindrical portion 9 is connected by a frusto-conical pipe portion 7 with a portion 12 of the central conduit having a tapered outlet 12a which extends into the inlet orifice 3a the last portion of the central conduit in the form of a discharge pipe 3 having a greater diameter than that of the section 12so as to define an annular free passage between the inlet orifice 3a and the tapered outlet 12a of the portion 12.The inner outlet end of the pipe 11 ends at the restricted cross-section of the pipe portion 7 so as to define a constriction duct with this latter.
The apparatus according to the embodiment of Figure 1 operates as follows.
During the exhaust stroke of a cylinder piston of an engine, the exhaust gases pushed forwards by the piston, enter the exhaust pipe 2 and flow out into the casing I and partly expand in the chamber 4 and then in the chamber 5, partly enter directly into the annular space between the pipe section 9 and the pipe 11, and partly pass directly into the pipe 11. In particular running conditions and under the ejector effect created in the frusto-conical passageway between the pipe portion 7 and the pipe 11, a portion of the exhaust gases flowing along the annular passage between the pipes 9 and 11 can pass into the chamber 4 through the first rows of the holes 10. In any case expanded gases are sucked at least through the other hole rows from the chamber 5, the expanded gases reducing the pressure acting on the cylinder piston mixing with the gases directly passing through the central conduit. Then the gas flow coming out of the outlet 12a enters the last portion, pipe 3, of the central conduit causing a suction effect to be created through the annular passageway formed between the outlet 12a and the inlet orifice 3a, thus the expanded gases still remaining in the chambers 4 and 5 are sucked into the exhaust gas flow which is discharged in the atmosphere. In addition an annular space 8 is formed around the first portion of the discharge pipe which acts as a sound deadening expansion box, which receives and returns gas from the expansion chamber.
The embodiment of Figure 2 is substantially similar to that of Figure 1 so that the parts having the same functions are indicated with the same reference numbers.
The exhaust pipe 2 is now connected with the casing 1 through an adjustable pipe union 13 telescopically connected in a fluidtight manner with the pipe 2 in order that the union 13 can perform axial movement with respect to the pipe 2 and the casing 1.
For such a purpose, the pipe union 13 is inserted through the end wall l a of the casing 1 in a fluid-tight manner, but its axial position can be adjusted for instance by means of adjustment means 14 controlled by a control knurled ring 15. In this embodiment the configuration of the central axial conduit 18 has been modified and it comprises a first portion including a series of frusto-conical coaxial spaced walls 16 defining therebetween frusto-conical passageways 17, the first ones of which put a portion of the chamber 4 in communication with the inner central conduit, and the second of which put the chamber 5 in communication with the inner central conduit. The chambers 4 and 5 together forming an expansion chamber again. The conduit extends downwardly as a cylindrical coaxial portion 18 having a solid wall.The chamber 8 has a solid bottom 20 separating said chamber from a closed chamber 21.
The portion 18a of the conduit passing through said chamber 21 is provided with a plurality of holes 19. The end of the conduit is then connected to or forms itself the discharge pipe.
The embodiment operates substantially in a manner identical to that of the preceding embodiment. The chamber 8 below the chamber 5 acts as an expansion box. The arrows in Figure 2 indicate the directions of the movement of the gases in the apparatus.
The chamber 21 associated with the perforated portion 18a of the central conduit 18 acts as a further sound deadening device.
It is pointed out that the apparatus of the present invention includes an exhaust pipe, a main central conduit housed in a cylindrical casing including a separate or integral discharge pipe which are coaxial.
The reduction of the pressure of the exhaust gases, the sound deadening effect and the reduction of the pulsation effect are obtained by substantially radial passages of the exhaust gases in the central conduit into and from annular surrounding chambers under an induction effect of a value varying according to the engine running conditions.
Of course, a sound deadening chamber 21, similar to that embodied in the apparatus of Figure 2 could also be connected or embodied in the apparatus of Figure 1.
WHAT WE CLAIM IS: 1. An apparatus for improving the exit and silencing of the exhaust gases from an internal combustion engine comprising: a) a cylindrical casing having two end walls, one end wall providing a gas inlet connectible to an exhaust pipe of the engine and a gas outlet being provided in the other end wall.
b) a central conduit extending substantially along the length of said cylindrical casing coaxial with said inlet and outlet to provide a gas path between said inlet and said outlet, one end of said conduit being adjacent said inlet to receive a portion of the exhaust gas, said central conduit having a plurality of apertures along a proportion of its length from its one end, c) a chamber formed between said casing and said central conduit, a portion of said chamber acting as an expansion chamber being arranged to receive the portion of the exhaust gas not received by the conduit one end and from which the said portion of exhaust gas not received by the conduit is returned into said central conduit through at least said apertures, the remaining portion of said chamber acting as an expansion box which receives and returns gas from the expansion chamber, said central conduit being shaped to create an ejector effect whereby exhaust gas is removed at least in part from said expansion chamber through said apertures into said conduit to said outlet.
2. An apparatus according to Claim 1, further comprising means to control the proportion of gas entering the conduit and expansion chamber.
3. An apparatus according to Claim 2, wherein the exhaust pipe of the engine is connectable with the casing inlet end wall by means of a pipe union, said pipe union being axially extendable into said inlet end wall toward said conduit end adjacent said inlet so as to vary the distance between said pipe union and conduit end thereby controlling the proportion of gas entering the conduit and expansion chamber.
4. An apparatus according to Claim 1, 2 or 3 wherein said conduit comprises first and second cylindrical portions, the first portion being of larger diameter than the second portion, said first and second portions being connected by a frustoconical pipe portion, the first portion being provided with a plurality of apertures in the form of radial holes leading into said expansion chamber and having a concentric pipe therein, of smaller diameter than said second portion, which extends into frustoconical pipe portion, said second portion of said conduit having a tapered end, said
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    that the parts having the same functions are indicated with the same reference numbers.
    The exhaust pipe 2 is now connected with the casing 1 through an adjustable pipe union 13 telescopically connected in a fluidtight manner with the pipe 2 in order that the union 13 can perform axial movement with respect to the pipe 2 and the casing 1.
    For such a purpose, the pipe union 13 is inserted through the end wall l a of the casing 1 in a fluid-tight manner, but its axial position can be adjusted for instance by means of adjustment means 14 controlled by a control knurled ring 15. In this embodiment the configuration of the central axial conduit 18 has been modified and it comprises a first portion including a series of frusto-conical coaxial spaced walls
    16 defining therebetween frusto-conical passageways 17, the first ones of which put a portion of the chamber 4 in communication with the inner central conduit, and the second of which put the chamber 5 in communication with the inner central conduit. The chambers 4 and 5 together forming an expansion chamber again. The conduit extends downwardly as a cylindrical coaxial portion 18 having a solid wall.The chamber 8 has a solid bottom 20 separating said chamber from a closed chamber 21.
    The portion 18a of the conduit passing through said chamber 21 is provided with a plurality of holes 19. The end of the conduit is then connected to or forms itself the discharge pipe.
    The embodiment operates substantially in a manner identical to that of the preceding embodiment. The chamber 8 below the chamber 5 acts as an expansion box. The arrows in Figure 2 indicate the directions of the movement of the gases in the apparatus.
    The chamber 21 associated with the perforated portion 18a of the central conduit 18 acts as a further sound deadening device.
    It is pointed out that the apparatus of the present invention includes an exhaust pipe, a main central conduit housed in a cylindrical casing including a separate or integral discharge pipe which are coaxial.
    The reduction of the pressure of the exhaust gases, the sound deadening effect and the reduction of the pulsation effect are obtained by substantially radial passages of the exhaust gases in the central conduit into and from annular surrounding chambers under an induction effect of a value varying according to the engine running conditions.
    Of course, a sound deadening chamber 21, similar to that embodied in the apparatus of Figure 2 could also be connected or embodied in the apparatus of Figure 1.
    WHAT WE CLAIM IS: 1. An apparatus for improving the exit and silencing of the exhaust gases from an internal combustion engine comprising: a) a cylindrical casing having two end walls, one end wall providing a gas inlet connectible to an exhaust pipe of the engine and a gas outlet being provided in the other end wall.
    b) a central conduit extending substantially along the length of said cylindrical casing coaxial with said inlet and outlet to provide a gas path between said inlet and said outlet, one end of said conduit being adjacent said inlet to receive a portion of the exhaust gas, said central conduit having a plurality of apertures along a proportion of its length from its one end, c) a chamber formed between said casing and said central conduit, a portion of said chamber acting as an expansion chamber being arranged to receive the portion of the exhaust gas not received by the conduit one end and from which the said portion of exhaust gas not received by the conduit is returned into said central conduit through at least said apertures, the remaining portion of said chamber acting as an expansion box which receives and returns gas from the expansion chamber, said central conduit being shaped to create an ejector effect whereby exhaust gas is removed at least in part from said expansion chamber through said apertures into said conduit to said outlet.
  2. 2. An apparatus according to Claim 1, further comprising means to control the proportion of gas entering the conduit and expansion chamber.
  3. 3. An apparatus according to Claim 2, wherein the exhaust pipe of the engine is connectable with the casing inlet end wall by means of a pipe union, said pipe union being axially extendable into said inlet end wall toward said conduit end adjacent said inlet so as to vary the distance between said pipe union and conduit end thereby controlling the proportion of gas entering the conduit and expansion chamber.
  4. 4. An apparatus according to Claim 1, 2 or 3 wherein said conduit comprises first and second cylindrical portions, the first portion being of larger diameter than the second portion, said first and second portions being connected by a frustoconical pipe portion, the first portion being provided with a plurality of apertures in the form of radial holes leading into said expansion chamber and having a concentric pipe therein, of smaller diameter than said second portion, which extends into frustoconical pipe portion, said second portion of said conduit having a tapered end, said
    conduit further including a discharge pipe mounted to the gas outlet wall having an inlet orifice into which enters said tapered end, the flow of the gas in the conduit through said frusto-conical pipe portion and said tapered end causing respective ejector effects such, that gas is drawn into said conduit from said expansion chamber.
  5. 5. An apparatus according to Claim 1, 2 or 3 wherein a portion of said conduit comprises a plurality of frusto-conical coaxial walls converging in the direction of the outlet end wall of said casing providing said apertures leading into said expansion chamber. flow of gas in the conduit past said frusto-conical walls providing an ejector effect such that gas is drawn from said expansion chamber into said conduit, the remaining portion of said conduit extending through said outlet end wall of the casing, the apparatus further including a silencing chamber formed between the casing and a portion of the conduit and between said expansion box and the casing end wall, said conduit being provided with holes therein to allow gas to enter said silencing chamber.
  6. 6. An apparatus for improving the exit and silencing of the exhaust gases from an internal combustion engine substantially as herein described with reference to Figures I or 2 of the accompanying drawings.
GB4897876A 1975-12-02 1976-11-24 Apparatus for the exit and silencing of the exhaus gases from an internal combustion engine for example a petrol engine Expired GB1565374A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8255175A IT1056390B (en) 1975-12-02 1975-12-02 IC petrol engine silencer - has less restrictive baffling to operate by using exhaust stream kinetic reactions
IT8253376A IT1073548B (en) 1976-10-15 1976-10-15 IC petrol engine silencer - has less restrictive baffling to operate by using exhaust stream kinetic reactions

Publications (1)

Publication Number Publication Date
GB1565374A true GB1565374A (en) 1980-04-16

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GB4897876A Expired GB1565374A (en) 1975-12-02 1976-11-24 Apparatus for the exit and silencing of the exhaus gases from an internal combustion engine for example a petrol engine

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197026A (en) * 1986-09-29 1988-05-11 Truscott John Henry Peycke Exhaust silencers for i.c. engines
US6336471B1 (en) * 1981-07-16 2002-01-08 James J. Feuling Flow system for enhancing undirectional fluid flow

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6336471B1 (en) * 1981-07-16 2002-01-08 James J. Feuling Flow system for enhancing undirectional fluid flow
GB2197026A (en) * 1986-09-29 1988-05-11 Truscott John Henry Peycke Exhaust silencers for i.c. engines

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee