GB2039602A - Pump nozzle for air-compressing fuel-injection internal-combustion engines - Google Patents

Pump nozzle for air-compressing fuel-injection internal-combustion engines Download PDF

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Publication number
GB2039602A
GB2039602A GB7943480A GB7943480A GB2039602A GB 2039602 A GB2039602 A GB 2039602A GB 7943480 A GB7943480 A GB 7943480A GB 7943480 A GB7943480 A GB 7943480A GB 2039602 A GB2039602 A GB 2039602A
Authority
GB
United Kingdom
Prior art keywords
pump
fuel
chamber
nozzle
feed
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Withdrawn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
GB7943480A
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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 Daimler Benz AG filed Critical Daimler Benz AG
Publication of GB2039602A publication Critical patent/GB2039602A/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Withdrawn legal-status Critical Current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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

A fuel-injection pump nozzle for an air-compressing, fuel-injection engine, having a piston (4) actuated by a drive means (2,3) and sliding in a cylinder (15). An arrangement of feed bores (21,22) is provided between a pump chamber (18) and a nozzle chamber (20) in which a valve member (19) is disposed. The piston (4) is provided at one end with shaped portions (6,7,8) and (9,10,11) which respectively control the delivery volume and the entry cross- section to the bore 22; one of the feed bores (21) forming a permanent connection between the pump chamber (18) and the nozzle chamber (20) and the other feed bore (22) forming an intermittently controlled connection between the two chambers, controlled as aforesaid by the cross-section controlling portion (11) of the piston (4). The piston (4) may have a shaped portion (13) of the connection controlling portion (11) forming a throttle gap (16) regulating the second feed (22) and the first feed (21) may be provided with a non-return valve (26). <IMAGE>

Description

SPECIFICATION Pump nozzle for air-compressing fuel-injection internal-combustion engines The invention relates to fuel injection pump nozzles for air-compressing, fuel-injection internalcombustion engines, having a mechanically operable pump piston bounding a pump chamber and a bore arrangement leading from the pump chamber into a nozzle chamber, through which fuel is fed to a valve pintle arranged in the nozzle chamber.
The present invention seeks to provide, particularly for high speed Diesel engines, a pump nozzle by means of which quieter and stable running of the internal-combustion engine can be achieved.
According to the invention, there is provided a pump nozzle assembly for an air-compression fuelinjection internal-combustion engine, comprising a mechanically-operable pump piston bounding a pump chamber and a bore arrangement leading from the pump chamber into a nozzle chamber, through which fuel is fed to a valve member arranged in the nozzle chamber, wherein the pump piston is provided with a volume-controlling portion and a cross-section-controlling portion and the bore arrangement includes two mutually separate feeds which issue into the nozzle chamber, the first feed providing a permanent connection between the pump chamber and the nozzle chamber through a throttle, and the second feed co-operates with the cross-section-controlling portion of the pump piston to intermittently connect the pump chamber and the nozzle chamber.
Such a construction enables a noise-reducing start of fuel delivery, particularly if, in accordance with one embodiment of the invention, the end of the pump piston in the region of the cross-sectioncontrolling part has a projection, between which and the wall of the pump cylinder an annular gap throttling the fuel flow is formed.
By virtue of this configuration, at the start of fuel delivery the path to the inlet of the second feed in constricted and thus acts temporarily as a throttle.
For the injection of fuel into the combustion chamber this means that a relatively smaller quantity of fuel is injected at the start of delivery, increasing towards the end of the delivery.
In order to permit a satisfactory operation of the pump nozzle without susceptibility to faults, a nonreturn valve may be arranged at least in the first feed between the pump chamber and the nozzle chamber.
As a further advantageous development of the invention, the volume-controlling and the crosssection-controlling parts of the pump piston each be provided with two control edges.
An embodiment of the invention will now be described by way of an example, with reference to the accompanying drawing which shows a fuel injection nozzle in axial section.
The pump piston 4 of a fuel injection nozzle 5, which is rotatable by an adjusting lever 1 and driven through a tappet 2 by a cam 3 of an air-compression fuel-injection internal-combustion engine, is provided with four control edges, the control edges designated 6 and 7 being associated with the volume-controlling part 8 of the pump piston and the control edges designated 9 and 10 being associated with the cross-section-controlling part 11 of the pump piston.
The end 12 of the pump piston 4 is provided in the region in which the cross-section-controlling part 11 is located with a circular-arcuate shaped projection 13, such that a part-annular gap 16 is formed between the projection and the wall 14 of the pump cylinder 15.
The control edges 6 and 7 co-operating with a control bore 17 control the start and finish of fuel delivery and thus the fuel-injection volume.
Fuel flowing into a pump chamber 18 passes through a bore arrangement into a nozzle chamber 20 containing a valve pintle 19. The bore arrangement is constituted by two feeds 21, 22, the first feed 21 being provided with a throttle 23 and providing a permanent connection between the pump chamber 18 and the nozzle chamber 20, the second feed 22 connects the two chambers 18 and 20 together intermittently - as a function of the position of the pump piston 4.
The nozzle spring chamber 24 has a connection, (not shown), to the advanced pressure chamber 25, so that the chambers 24 and 25 are always maintained under a low pressure.
The control edges 9, 10 of the cross-sectioncontrolling part 11 may, depending upon the mode of control, either be straight or else thay may be helicoidally curved similarly to the control edges 6 and 7.
The principle of operation of this pump nozzle is as follows: Afuel feed pump draws fuel from a fuel tank (not shown) and forces it, in the rearmost position of the pump piston 4, through the advanced pressure chamber 25 and the control bore 17 into the chambers 18 and 20. During the forward stroke of the piston, in the direction of the arrow, the control edge 7 closes the control bore 17. Simultaneously or subsequently the second feed 22 is closed by the control edge 10. Here again, up to the complete closure of the feed passage 22, fuel can be forced while being progressively throttled into the feed 22 through the small part annular gap 16.
Whereas the control bore 17 and the feed 22 are closed, the first feed 21 still remains open. The pressure in the nozzle chamber 20 has now risen so that the pretensioned pintle 19 lifts from its valve seat. The injection of the fuel now occurs until rotation of the cam 3 allows the control edge 6 to move rearwards and free the control bore 17.
In order to prevent the fuel from being forced back in the feed 21, a nonreturn valve 26 may be arranged downstream of the throttle 23.
1. A pump nozzle assembly for an aircompression fuel-injection internal-combustion engine, comprising a mechanically-operable pump piston bounding a pump chamber and a bore
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Pump nozzle for air-compressing fuel-injection internal-combustion engines The invention relates to fuel injection pump nozzles for air-compressing, fuel-injection internalcombustion engines, having a mechanically operable pump piston bounding a pump chamber and a bore arrangement leading from the pump chamber into a nozzle chamber, through which fuel is fed to a valve pintle arranged in the nozzle chamber. The present invention seeks to provide, particularly for high speed Diesel engines, a pump nozzle by means of which quieter and stable running of the internal-combustion engine can be achieved. According to the invention, there is provided a pump nozzle assembly for an air-compression fuelinjection internal-combustion engine, comprising a mechanically-operable pump piston bounding a pump chamber and a bore arrangement leading from the pump chamber into a nozzle chamber, through which fuel is fed to a valve member arranged in the nozzle chamber, wherein the pump piston is provided with a volume-controlling portion and a cross-section-controlling portion and the bore arrangement includes two mutually separate feeds which issue into the nozzle chamber, the first feed providing a permanent connection between the pump chamber and the nozzle chamber through a throttle, and the second feed co-operates with the cross-section-controlling portion of the pump piston to intermittently connect the pump chamber and the nozzle chamber. Such a construction enables a noise-reducing start of fuel delivery, particularly if, in accordance with one embodiment of the invention, the end of the pump piston in the region of the cross-sectioncontrolling part has a projection, between which and the wall of the pump cylinder an annular gap throttling the fuel flow is formed. By virtue of this configuration, at the start of fuel delivery the path to the inlet of the second feed in constricted and thus acts temporarily as a throttle. For the injection of fuel into the combustion chamber this means that a relatively smaller quantity of fuel is injected at the start of delivery, increasing towards the end of the delivery. In order to permit a satisfactory operation of the pump nozzle without susceptibility to faults, a nonreturn valve may be arranged at least in the first feed between the pump chamber and the nozzle chamber. As a further advantageous development of the invention, the volume-controlling and the crosssection-controlling parts of the pump piston each be provided with two control edges. An embodiment of the invention will now be described by way of an example, with reference to the accompanying drawing which shows a fuel injection nozzle in axial section. The pump piston 4 of a fuel injection nozzle 5, which is rotatable by an adjusting lever 1 and driven through a tappet 2 by a cam 3 of an air-compression fuel-injection internal-combustion engine, is provided with four control edges, the control edges designated 6 and 7 being associated with the volume-controlling part 8 of the pump piston and the control edges designated 9 and 10 being associated with the cross-section-controlling part 11 of the pump piston. The end 12 of the pump piston 4 is provided in the region in which the cross-section-controlling part 11 is located with a circular-arcuate shaped projection 13, such that a part-annular gap 16 is formed between the projection and the wall 14 of the pump cylinder 15. The control edges 6 and 7 co-operating with a control bore 17 control the start and finish of fuel delivery and thus the fuel-injection volume. Fuel flowing into a pump chamber 18 passes through a bore arrangement into a nozzle chamber 20 containing a valve pintle 19. The bore arrangement is constituted by two feeds 21, 22, the first feed 21 being provided with a throttle 23 and providing a permanent connection between the pump chamber 18 and the nozzle chamber 20, the second feed 22 connects the two chambers 18 and 20 together intermittently - as a function of the position of the pump piston 4. The nozzle spring chamber 24 has a connection, (not shown), to the advanced pressure chamber 25, so that the chambers 24 and 25 are always maintained under a low pressure. The control edges 9, 10 of the cross-sectioncontrolling part 11 may, depending upon the mode of control, either be straight or else thay may be helicoidally curved similarly to the control edges 6 and 7. The principle of operation of this pump nozzle is as follows: Afuel feed pump draws fuel from a fuel tank (not shown) and forces it, in the rearmost position of the pump piston 4, through the advanced pressure chamber 25 and the control bore 17 into the chambers 18 and 20. During the forward stroke of the piston, in the direction of the arrow, the control edge 7 closes the control bore 17. Simultaneously or subsequently the second feed 22 is closed by the control edge 10. Here again, up to the complete closure of the feed passage 22, fuel can be forced while being progressively throttled into the feed 22 through the small part annular gap 16. Whereas the control bore 17 and the feed 22 are closed, the first feed 21 still remains open. The pressure in the nozzle chamber 20 has now risen so that the pretensioned pintle 19 lifts from its valve seat. The injection of the fuel now occurs until rotation of the cam 3 allows the control edge 6 to move rearwards and free the control bore 17. In order to prevent the fuel from being forced back in the feed 21, a nonreturn valve 26 may be arranged downstream of the throttle 23. CLAIMS
1. A pump nozzle assembly for an aircompression fuel-injection internal-combustion engine, comprising a mechanically-operable pump piston bounding a pump chamber and a bore arrangement leading from the pump chamber into a nozzle chamber, through which fuel is fed to a valve member arranged in the nozzle chamber, wherein the pump piston is provided with a volumecontrolling portion and a cross-section controlling portion and the bore arrangement includes two mutually separate feeds which issue into the nozzle chamber, the first feed providing a permanent connection between the pump chamber and the nozzle chamber through a throttle, and the second feed co-operates with the cross-section-control I ing portion of the pump piston to intermittently connect the pump chamber and the nozzle chamber.
2. A pump nozzle assembly according to Claim 1, wherein the end of the pump piston in the region of the cross-section-controlling portion has a projection, between which and the wall of the pump cylinder a part-annular gap throttling the fuel flow is formed.
3. A pump nozzle assembly according to Claim 1 or Claim 2, wherein a nonreturn valve is arranged in the first feed.
4. A pump nozzle assembly according to any one of Claims 1 to 3, wherein both the volumecontrolling portion and the cross-section-controlling portion of the pump piston are each provided with two control edges.
5. Afuel injection pump nozzle assembly, for an air-compressing fuel injection internal combustion engine, substantially as hereinbefore described, with reference to the accompanying drawing.
GB7943480A 1978-12-22 1979-12-18 Pump nozzle for air-compressing fuel-injection internal-combustion engines Withdrawn GB2039602A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782855539 DE2855539A1 (en) 1978-12-22 1978-12-22 PUMP - NOZZLE FOR AIR COMPRESSING INJECTION ENGINE

Publications (1)

Publication Number Publication Date
GB2039602A true GB2039602A (en) 1980-08-13

Family

ID=6058028

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7943480A Withdrawn GB2039602A (en) 1978-12-22 1979-12-18 Pump nozzle for air-compressing fuel-injection internal-combustion engines

Country Status (4)

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DE (1) DE2855539A1 (en)
FR (1) FR2444814A1 (en)
GB (1) GB2039602A (en)
IT (1) IT1120232B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3807965C2 (en) * 1987-03-21 1994-08-25 Volkswagen Ag Pump nozzle
DE4038443A1 (en) * 1990-12-01 1992-06-04 Kloeckner Humboldt Deutz Ag Fuel injector with needle guide for diesel engine - has control pin acting as damping piston, suited to mass prodn. without special finish or machining

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE738549C (en) * 1936-10-20 1943-08-20 Bernhard Bischof Device for injecting fuel in internal combustion engines
GB542844A (en) * 1940-07-25 1942-01-29 George Stephen Kammer Improvements relating to fuel injection in internal combustion engines
US2407610A (en) * 1942-03-16 1946-09-10 Kammer George Stephen Fuel injection in internalcombustion engines
FR2067883A5 (en) * 1969-11-20 1971-08-20 Peugeot

Also Published As

Publication number Publication date
IT7951134A0 (en) 1979-12-19
DE2855539A1 (en) 1980-07-03
IT1120232B (en) 1986-03-19
FR2444814A1 (en) 1980-07-18

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