GB2121876A - Compression ignition engine pre-combustion chamber - Google Patents

Compression ignition engine pre-combustion chamber Download PDF

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Publication number
GB2121876A
GB2121876A GB08314402A GB8314402A GB2121876A GB 2121876 A GB2121876 A GB 2121876A GB 08314402 A GB08314402 A GB 08314402A GB 8314402 A GB8314402 A GB 8314402A GB 2121876 A GB2121876 A GB 2121876A
Authority
GB
United Kingdom
Prior art keywords
insert
annular
lower portion
seat
head
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Withdrawn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
GB08314402A
Other versions
GB8314402D0 (en
Inventor
Aragona Antonio Burgio Di
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
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 Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of GB8314402D0 publication Critical patent/GB8314402D0/en
Publication of GB2121876A publication Critical patent/GB2121876A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/14—Engines characterised by precombustion chambers with compression ignition
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

A hollow metal member (10) which is insertable in a seat in the engine cylinder head is formed of an upper portion (12) for receiving a fuel injector and having screw-threads (16) engageable in the seat, and a lower portion (14) having an inclined outlet duct (32) and a lateral hole (38) for a preheating plug. The upper and lower portions (12, 14) are relatively sealed by the interposition of a sealing washer (40), a projection 18 providing radial location. <IMAGE>

Description

SPECIFICATION Precombustion chamber for internal combustion engines with compression ignition, particularly for motor vehicles The present invention relates generally to precombustion chambers for compression-ignition internal combustion engines with indirect injection, particularly for motor vehicles.
In particular, the invention is concerned with a precombustion chamber formed by a hollow metal insert insertable in a seat in the head of an engine, and including an upper portion adapted to receive a fuel injector and having means engageable in the seat in the head, and a lower portion having an inclined outlet duct and a lateral hole for the possible introduction of a preheating plug.
The precombustion chamber according to the invention is characterised in that the upper portion and the lower portion of the insert are constituted by two separate parts which are coupled together axially by means of mating forms, with the interposition of sealing means.
By virtue of this characteristic, the insert which defines the precombustion chamber according to the invention has the advantage that it can be manufactured more simply and economically than inserts known at present, in which the upper portion and the lower portion are formed in one piece.
According to the invention the upper portion of the insert has an annular internal projection for the centering of the lower portion, and an annular outer frontal surface, and the lower portion has an annular frontal flange which cooperates with said outer frontal surface when the two parts are coupled together.
The invention will now be described in detail with reference to the appended drawing, provided purely by way of non-limiting example, which illustrates a precombustion chamber according to the invention in axial section.
With reference to the d'rawing, a tubular metal insert, generally indicated 10, is insertable in a seat, not illustrated, formed in the head of a compression-ignitiown internal combustion engine with indirect injection.
The tubular insert 10 comprises an upper portion 12 and a lower portion 14 which, according to the invention, are constituted by two separate parts coupled together axially in the manner described below.
The upper portion 12 has a generally cylindrical form and is provided at its upper end with outer screw-threading 1 6 arranged to engage corresponding screw-threading in the seat in the head.
The lower end of the portion 12 defines an annular internal centering projection 1 8 and a plane 20 constituted by an outer circular bearing and sealing ring on the lower portion 14, the function of which will be clarified below.
The cavity of the upper portion 12, indicated 22, is arranged to receive a fuel injector, not illustrated, having a baffle plate of conventional type, arranged to bear against an annular frustoconical seat 41 defined in the bottom of the cavity 22. The upper part of the cavity 22 is formed with screw-threading 24 for retaining the fuel injector.
The cavity in the lower-portion 1 of the insert 1 0 defines a precombustion chamber for the engine and comprises an upper, substantially cylindrical chamber 26, an intermediate chamber 28 having a smaller diameter than the upper chamber 26 and connected thereto by a rounded frusto-conical junction 30, and an inclined outlet duct 32 which, in the installed condition of the insert 10 in the engine, opens into the upper part of a corresponding cylinder.
The inclination of the outlet duct 32 relative to the median axis A of the insert 10 is of the order of 1 20c, while the axis B of the lower chamber 28 is offset relative to the median axis A of the insert 10 towards the side opposite that to which the outlet duct 32 is directed.
The upper part of the lower portion 14 has an outer annular bearing flange 34 and, close to its lower end, a smaller diameter part 36.
Furthermore, a hole 38 is formed in the side wall of the portion 14 beneath the annular flange 34 for the possible introduction of a preheating plug in use.
The assembly of the upper portion 1 2 and the lower portion 14 of the insert 10 is achieved by simply bringing the two portions together axially, interposing an annular sealing washer 40 between the flange 34 and the plane 20, and bringing the flange 34 and the plane 20 into mutual frontal contact. At this stage, the annular projection 1 8 facilitates the correct centering of the two portions 12,14.
In the installed condition of the insert 10 in the head of the engine, the annular flange 34 of the lower portion 14 bears against a corresponding shoulder of the seat in the head with the interposition of an annular sealing washer 42, while the outer screw-threading 1 6 of the upper portion 1 2 is screwed fully into the corresponding screw-threading of the seat.
Naturally, the scope of the present invention extends to embodiments which achieve equal utility by using the same innovative concept.
1. A precombustion chamber for an internal combustion engine with compression ignition, particuarly but not exclusively for motor vehicles, of the type constituted by a hollow metal insert insertable in a seat in the head of the engine, and including an upper portion adapted to receive a fuel injector with its baffle plate and having means engageable in the seat in the head, and a lower portion having an inclined outlet duct and a lateral hole into which a preheating plug can be introduced, in which the upper and the lower portions of the insert are constituted by two separate parts which are coupled together axially by means of mating forms, with the interposition of sealing means.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Precombustion chamber for internal combustion engines with compression ignition, particularly for motor vehicles The present invention relates generally to precombustion chambers for compression-ignition internal combustion engines with indirect injection, particularly for motor vehicles. In particular, the invention is concerned with a precombustion chamber formed by a hollow metal insert insertable in a seat in the head of an engine, and including an upper portion adapted to receive a fuel injector and having means engageable in the seat in the head, and a lower portion having an inclined outlet duct and a lateral hole for the possible introduction of a preheating plug. The precombustion chamber according to the invention is characterised in that the upper portion and the lower portion of the insert are constituted by two separate parts which are coupled together axially by means of mating forms, with the interposition of sealing means. By virtue of this characteristic, the insert which defines the precombustion chamber according to the invention has the advantage that it can be manufactured more simply and economically than inserts known at present, in which the upper portion and the lower portion are formed in one piece. According to the invention the upper portion of the insert has an annular internal projection for the centering of the lower portion, and an annular outer frontal surface, and the lower portion has an annular frontal flange which cooperates with said outer frontal surface when the two parts are coupled together. The invention will now be described in detail with reference to the appended drawing, provided purely by way of non-limiting example, which illustrates a precombustion chamber according to the invention in axial section. With reference to the d'rawing, a tubular metal insert, generally indicated 10, is insertable in a seat, not illustrated, formed in the head of a compression-ignitiown internal combustion engine with indirect injection. The tubular insert 10 comprises an upper portion 12 and a lower portion 14 which, according to the invention, are constituted by two separate parts coupled together axially in the manner described below. The upper portion 12 has a generally cylindrical form and is provided at its upper end with outer screw-threading 1 6 arranged to engage corresponding screw-threading in the seat in the head. The lower end of the portion 12 defines an annular internal centering projection 1 8 and a plane 20 constituted by an outer circular bearing and sealing ring on the lower portion 14, the function of which will be clarified below. The cavity of the upper portion 12, indicated 22, is arranged to receive a fuel injector, not illustrated, having a baffle plate of conventional type, arranged to bear against an annular frustoconical seat 41 defined in the bottom of the cavity 22. The upper part of the cavity 22 is formed with screw-threading 24 for retaining the fuel injector. The cavity in the lower-portion 1 of the insert 1 0 defines a precombustion chamber for the engine and comprises an upper, substantially cylindrical chamber 26, an intermediate chamber 28 having a smaller diameter than the upper chamber 26 and connected thereto by a rounded frusto-conical junction 30, and an inclined outlet duct 32 which, in the installed condition of the insert 10 in the engine, opens into the upper part of a corresponding cylinder. The inclination of the outlet duct 32 relative to the median axis A of the insert 10 is of the order of 1 20c, while the axis B of the lower chamber 28 is offset relative to the median axis A of the insert 10 towards the side opposite that to which the outlet duct 32 is directed. The upper part of the lower portion 14 has an outer annular bearing flange 34 and, close to its lower end, a smaller diameter part 36. Furthermore, a hole 38 is formed in the side wall of the portion 14 beneath the annular flange 34 for the possible introduction of a preheating plug in use. The assembly of the upper portion 1 2 and the lower portion 14 of the insert 10 is achieved by simply bringing the two portions together axially, interposing an annular sealing washer 40 between the flange 34 and the plane 20, and bringing the flange 34 and the plane 20 into mutual frontal contact. At this stage, the annular projection 1 8 facilitates the correct centering of the two portions 12,14. In the installed condition of the insert 10 in the head of the engine, the annular flange 34 of the lower portion 14 bears against a corresponding shoulder of the seat in the head with the interposition of an annular sealing washer 42, while the outer screw-threading 1 6 of the upper portion 1 2 is screwed fully into the corresponding screw-threading of the seat. Naturally, the scope of the present invention extends to embodiments which achieve equal utility by using the same innovative concept. CLAIMS
1. A precombustion chamber for an internal combustion engine with compression ignition, particuarly but not exclusively for motor vehicles, of the type constituted by a hollow metal insert insertable in a seat in the head of the engine, and including an upper portion adapted to receive a fuel injector with its baffle plate and having means engageable in the seat in the head, and a lower portion having an inclined outlet duct and a lateral hole into which a preheating plug can be introduced, in which the upper and the lower portions of the insert are constituted by two separate parts which are coupled together axially by means of mating forms, with the interposition of sealing means.
2. A precombustion chamber as claimed in Claim 1 , in which the upper part of the insert has an annular internal projection for the centering of the lower portion, and an annular outer frontal surface which cooperates with a complementary frontal annular flange of the lower portion (14) when the two parts are coupled together.
3. A precombustion chamber substantially as herein described with reference to, and as shown in, the appended drawings.
GB08314402A 1982-06-17 1983-05-25 Compression ignition engine pre-combustion chamber Withdrawn GB2121876A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8253417U IT8253417V0 (en) 1982-06-17 1982-06-17 COMBUSTION CHAMBER FOR INTERNAL COMBUSTION IGNITION ENGINES FOR COMPRESSION PARTICULARLY FOR VEHICLES

Publications (2)

Publication Number Publication Date
GB8314402D0 GB8314402D0 (en) 1983-06-29
GB2121876A true GB2121876A (en) 1984-01-04

Family

ID=11282570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08314402A Withdrawn GB2121876A (en) 1982-06-17 1983-05-25 Compression ignition engine pre-combustion chamber

Country Status (6)

Country Link
BR (1) BR8303198A (en)
DE (2) DE3321867A1 (en)
ES (1) ES272736Y (en)
FR (1) FR2528906A1 (en)
GB (1) GB2121876A (en)
IT (1) IT8253417V0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020154748A1 (en) * 2019-01-30 2020-08-06 Innio Jenbacher Gmbh & Co Og Pre-chamber assembly for an internal combustion engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB444879A (en) * 1934-06-29 1936-03-30 Harry Ralph Ricardo Improvements in or relating to internal combustion engines of the liquid fuel injection compression ignition type
GB457491A (en) * 1935-05-30 1936-11-30 Harry Ralph Ricardo Improvements in or relating to combustion chambers of internal combustion engines ofthe compression ignition type
GB892171A (en) * 1959-11-16 1962-03-21 Lucien Kuntz Improvements in or relating to a cylinder-head for internal combustion engine
GB1196790A (en) * 1967-12-04 1970-07-01 Tadao Yamaoka Precombustion Chamber of Diesel Engine.
GB1410538A (en) * 1972-05-25 1975-10-15 List H Internal combustion engine with indirect fuel injection
GB1602270A (en) * 1977-09-23 1981-11-11 Fiat Auto Spa Diesel cycle engine having a precombustion chamber

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1250495A (en) * 1959-11-16 1961-01-13 Cylinder head for internal combustion heat engine
FR1293868A (en) * 1961-06-29 1962-05-18 Motoren Werke Mannheim Ag Attachment of a combustion chamber body to an air-cooled cylinder head
FR2393147A1 (en) * 1977-06-03 1978-12-29 Chrysler France Diesel engine with cylinder antechambers - has fuel injectors fitting into antechamber inserts positioned in spark plug openings

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB444879A (en) * 1934-06-29 1936-03-30 Harry Ralph Ricardo Improvements in or relating to internal combustion engines of the liquid fuel injection compression ignition type
GB457491A (en) * 1935-05-30 1936-11-30 Harry Ralph Ricardo Improvements in or relating to combustion chambers of internal combustion engines ofthe compression ignition type
GB892171A (en) * 1959-11-16 1962-03-21 Lucien Kuntz Improvements in or relating to a cylinder-head for internal combustion engine
GB1196790A (en) * 1967-12-04 1970-07-01 Tadao Yamaoka Precombustion Chamber of Diesel Engine.
GB1410538A (en) * 1972-05-25 1975-10-15 List H Internal combustion engine with indirect fuel injection
GB1602270A (en) * 1977-09-23 1981-11-11 Fiat Auto Spa Diesel cycle engine having a precombustion chamber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020154748A1 (en) * 2019-01-30 2020-08-06 Innio Jenbacher Gmbh & Co Og Pre-chamber assembly for an internal combustion engine

Also Published As

Publication number Publication date
ES272736Y (en) 1984-04-16
DE8317663U1 (en) 1984-06-20
IT8253417V0 (en) 1982-06-17
GB8314402D0 (en) 1983-06-29
ES272736U (en) 1983-11-01
DE3321867A1 (en) 1984-01-12
FR2528906A1 (en) 1983-12-23
BR8303198A (en) 1984-01-31

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)