GB2162894A - A variable volume expansion chamber for i.c. engine exhaust gases - Google Patents

A variable volume expansion chamber for i.c. engine exhaust gases Download PDF

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Publication number
GB2162894A
GB2162894A GB08420199A GB8420199A GB2162894A GB 2162894 A GB2162894 A GB 2162894A GB 08420199 A GB08420199 A GB 08420199A GB 8420199 A GB8420199 A GB 8420199A GB 2162894 A GB2162894 A GB 2162894A
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United Kingdom
Prior art keywords
expansion chamber
variable volume
volume expansion
internal
conical part
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.)
Withdrawn
Application number
GB08420199A
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GB8420199D0 (en
Inventor
Josef Petr Prokopius
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB08420199A priority Critical patent/GB2162894A/en
Publication of GB8420199D0 publication Critical patent/GB8420199D0/en
Publication of GB2162894A publication Critical patent/GB2162894A/en
Withdrawn legal-status Critical Current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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/166—Silencing apparatus characterised by method of silencing by using movable parts for changing gas flow path through the silencer or for adjusting the dimensions of a chamber or a pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/04—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues in exhaust systems only, e.g. for sucking-off combustion gases
    • F02B27/06—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues in exhaust systems only, e.g. for sucking-off combustion gases the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Characterised By The Charging Evacuation (AREA)

Abstract

The variable volume expansion chamber 1 accommodates an internal conical part 2 which is axially movable. By the axial movement of the internal conical part 2, the internal volume of the variable volume expansion chamber is varied in relation to the engine revolutions manually or automatically by operating cable 6. <IMAGE>

Description

SPECIFICATION A variable volume expansion chamber for combustion engines Technical Field: This invention relates to combustion engines, in particular to the exhaust systems.
Background Art: Combustion engines, especially two-stroke engines, are very sensitive to the exhaust arrangement. The exhaust system serves to discharge gases after the combustion from the engine cylinder. The exhaust system is controlling the pressures in the cylinder during the period of scavenging and therefore has a great influence on the engine power output and also influence on pollution emitted by the engine.
At present in the two-stroke engine development, there is used a tuned exhaust system, of which the most important part is an expansion chamber, to a particular range of the engine revolution band. Such system is then advantageous only in a narrow part of the revolution band, where it greatly helps to scavenge the engine cylinder. Because of this, the exhaust system's expansion chamber has to be designed as a compromise to suit the whole useble revolution band, wherefore it is only adequate over a very narrow part of the revolution band.
Disclosure of the Invention: According to the present invention, there is provided a variable volume expansion chamber, as a part of the engine exhaust system, especially for two-stroke engines, where there is adjustable internal volume of the said variable volume expansion chamber by an internal conical part in such way, that the said internal conical part is axially movable inside of the said variable volume expansion chamber, and, by the axial movement the internal conical part varies the internal volume of the variable volume expansion chamber.
The axial movement of the said internal conical part inside of the variable volume expansion chamber is controlled in relation to revolutions of the engine mechanically or electronically by a servo-system, and the movement is established in such a way that it gives the variable volume expansion chamber an adequate volume through the usable revolution power band. With this arrangement it is possible to obtain a greater usable power which improves also trackability of the engine and reduces unburned gas pollution.
A specific embodiment of the invention will now be described by way of an example with reference to the accompanying drawing in which: Figure 1 shows in section the variable volume expansion chamber with the axially movable internal back conical part in a position of the maximum volume of the variable volume expansion chamber.
Figure 2 shows in section the variable volume expansion chamber with the axially movable internal back conical part in a position of the minimum volume of the variable volume expansion chamber.
Figure 3 shows in section the variable volume expansion chamber with the axially movable internal front conical part in the medium position of the variable volume expansion chamber.
Referring to the accompaning drawing, there is provided the variable volume expansion chamber which comprises a body of the variable volume expansion chamber 1, the axially movable internal back or front conical part 2 with an internal tail or front pipe at its end 3, and a grooved external back or front pipe 4, a return spring 5, and an operating cable 6.
By operating the cable 6 the internal axially movable back or front conical part 2 is moved back and forward and by this movement varying the volume of the variable volume expansion chamber.
1. A variable volume expansion chamber comprising a conventional expansion chamber which accommodates an internal conical part with a cylindrical part at its end, the internal conical part being axially movable inside of the said conventional expansion chamber and by this axial movement varying the internal volume of the said variable volume expansion chamber.
2. A variable volume expansion chamber as claimed in Claim 1 wherein the said internal conical part is accommodated in the back part of the said variable volume expansion chamber.
3. A variable volume expansion chamber as claimed in Claim 1 wherein the said internal conical part is accommodated in the front of the said variable volume expansion chamber.
4. A variable volume expansion chamber as claimed in Claim 1 wherein the said internal conical part comprises two conical parts, both axially movable, of which one is accommodated in the front and second in the back of the said variable volume expansion chamber.
5. A variable volume expansion chamber as claimed in any preceding Claim, wherein the said internal conical part is axially moved manually or automatically in relation to the revolutions of the engine.
6. A variable volume expansion chamber substantially as described elswhere in this invention with reference to Figs. 1-3 of the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A variable volume expansion chamber for combustion engines Technical Field: This invention relates to combustion engines, in particular to the exhaust systems. Background Art: Combustion engines, especially two-stroke engines, are very sensitive to the exhaust arrangement. The exhaust system serves to discharge gases after the combustion from the engine cylinder. The exhaust system is controlling the pressures in the cylinder during the period of scavenging and therefore has a great influence on the engine power output and also influence on pollution emitted by the engine. At present in the two-stroke engine development, there is used a tuned exhaust system, of which the most important part is an expansion chamber, to a particular range of the engine revolution band. Such system is then advantageous only in a narrow part of the revolution band, where it greatly helps to scavenge the engine cylinder. Because of this, the exhaust system's expansion chamber has to be designed as a compromise to suit the whole useble revolution band, wherefore it is only adequate over a very narrow part of the revolution band. Disclosure of the Invention: According to the present invention, there is provided a variable volume expansion chamber, as a part of the engine exhaust system, especially for two-stroke engines, where there is adjustable internal volume of the said variable volume expansion chamber by an internal conical part in such way, that the said internal conical part is axially movable inside of the said variable volume expansion chamber, and, by the axial movement the internal conical part varies the internal volume of the variable volume expansion chamber. The axial movement of the said internal conical part inside of the variable volume expansion chamber is controlled in relation to revolutions of the engine mechanically or electronically by a servo-system, and the movement is established in such a way that it gives the variable volume expansion chamber an adequate volume through the usable revolution power band. With this arrangement it is possible to obtain a greater usable power which improves also trackability of the engine and reduces unburned gas pollution. A specific embodiment of the invention will now be described by way of an example with reference to the accompanying drawing in which: Figure 1 shows in section the variable volume expansion chamber with the axially movable internal back conical part in a position of the maximum volume of the variable volume expansion chamber. Figure 2 shows in section the variable volume expansion chamber with the axially movable internal back conical part in a position of the minimum volume of the variable volume expansion chamber. Figure 3 shows in section the variable volume expansion chamber with the axially movable internal front conical part in the medium position of the variable volume expansion chamber. Referring to the accompaning drawing, there is provided the variable volume expansion chamber which comprises a body of the variable volume expansion chamber 1, the axially movable internal back or front conical part 2 with an internal tail or front pipe at its end 3, and a grooved external back or front pipe 4, a return spring 5, and an operating cable 6. By operating the cable 6 the internal axially movable back or front conical part 2 is moved back and forward and by this movement varying the volume of the variable volume expansion chamber. CLAIMS
1. A variable volume expansion chamber comprising a conventional expansion chamber which accommodates an internal conical part with a cylindrical part at its end, the internal conical part being axially movable inside of the said conventional expansion chamber and by this axial movement varying the internal volume of the said variable volume expansion chamber.
2. A variable volume expansion chamber as claimed in Claim 1 wherein the said internal conical part is accommodated in the back part of the said variable volume expansion chamber.
3. A variable volume expansion chamber as claimed in Claim 1 wherein the said internal conical part is accommodated in the front of the said variable volume expansion chamber.
4. A variable volume expansion chamber as claimed in Claim 1 wherein the said internal conical part comprises two conical parts, both axially movable, of which one is accommodated in the front and second in the back of the said variable volume expansion chamber.
5. A variable volume expansion chamber as claimed in any preceding Claim, wherein the said internal conical part is axially moved manually or automatically in relation to the revolutions of the engine.
6. A variable volume expansion chamber substantially as described elswhere in this invention with reference to Figs. 1-3 of the accompanying drawing.
GB08420199A 1984-08-09 1984-08-09 A variable volume expansion chamber for i.c. engine exhaust gases Withdrawn GB2162894A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08420199A GB2162894A (en) 1984-08-09 1984-08-09 A variable volume expansion chamber for i.c. engine exhaust gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08420199A GB2162894A (en) 1984-08-09 1984-08-09 A variable volume expansion chamber for i.c. engine exhaust gases

Publications (2)

Publication Number Publication Date
GB8420199D0 GB8420199D0 (en) 1984-09-12
GB2162894A true GB2162894A (en) 1986-02-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08420199A Withdrawn GB2162894A (en) 1984-08-09 1984-08-09 A variable volume expansion chamber for i.c. engine exhaust gases

Country Status (1)

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GB (1) GB2162894A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190956A (en) * 1986-05-29 1987-12-02 Josef Petr Prokopius Combustion engine exhaust expansion chamber variable volume control
FR2685733A1 (en) * 1991-12-31 1993-07-02 Motarex Sa Exhaust silencer for mopeds, motorbikes and the like
WO1993020341A1 (en) * 1992-04-06 1993-10-14 Peter John Mcmanus Internal combustion engine variable tuned exhaust system
GB2321498A (en) * 1997-01-22 1998-07-29 John Stephen Roberts Two-stroke i.c. engine exhaust system with active control of effective tuned le
ITGE20130003A1 (en) * 2013-01-14 2014-07-15 Mirco Venzano VARIABLE EXPANSION FOR 2T ENGINES

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106545396A (en) * 2016-12-13 2017-03-29 中国船舶重工集团公司第七研究所 A kind of aerofluxuss boundary control device of single-cylinder engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434280A (en) * 1967-11-20 1969-03-25 Joe H Burkhart Exhaust chamber
US3726092A (en) * 1971-03-29 1973-04-10 R Raczuk Variable exhaust system for combustion engine
US4226298A (en) * 1979-07-17 1980-10-07 Guy Henri Bancel Exhaust device for internal combustion engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434280A (en) * 1967-11-20 1969-03-25 Joe H Burkhart Exhaust chamber
US3726092A (en) * 1971-03-29 1973-04-10 R Raczuk Variable exhaust system for combustion engine
US4226298A (en) * 1979-07-17 1980-10-07 Guy Henri Bancel Exhaust device for internal combustion engines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190956A (en) * 1986-05-29 1987-12-02 Josef Petr Prokopius Combustion engine exhaust expansion chamber variable volume control
FR2685733A1 (en) * 1991-12-31 1993-07-02 Motarex Sa Exhaust silencer for mopeds, motorbikes and the like
WO1993020341A1 (en) * 1992-04-06 1993-10-14 Peter John Mcmanus Internal combustion engine variable tuned exhaust system
GB2321498A (en) * 1997-01-22 1998-07-29 John Stephen Roberts Two-stroke i.c. engine exhaust system with active control of effective tuned le
ITGE20130003A1 (en) * 2013-01-14 2014-07-15 Mirco Venzano VARIABLE EXPANSION FOR 2T ENGINES

Also Published As

Publication number Publication date
GB8420199D0 (en) 1984-09-12

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