EP0285194A1 - Pompe d'injection de combustible pour moteurs à combustion interne - Google Patents

Pompe d'injection de combustible pour moteurs à combustion interne Download PDF

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Publication number
EP0285194A1
EP0285194A1 EP88200365A EP88200365A EP0285194A1 EP 0285194 A1 EP0285194 A1 EP 0285194A1 EP 88200365 A EP88200365 A EP 88200365A EP 88200365 A EP88200365 A EP 88200365A EP 0285194 A1 EP0285194 A1 EP 0285194A1
Authority
EP
European Patent Office
Prior art keywords
bore
fuel
inner chamber
spill
plunger
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.)
Ceased
Application number
EP88200365A
Other languages
German (de)
English (en)
Inventor
Carlo Rosastri
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.)
Lombardini Fabbrica Italiana Motori SpA
Original Assignee
Lombardini Fabbrica Italiana Motori 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 Lombardini Fabbrica Italiana Motori SpA filed Critical Lombardini Fabbrica Italiana Motori SpA
Publication of EP0285194A1 publication Critical patent/EP0285194A1/fr
Ceased 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston

Definitions

  • This invention relates to a fuel injection pump for internal combustion engines of the type comprising a cylindrical body provided with an axial inner chamber, a lateral port for fuel inlet to the inner chamber and a spill port for the fuel from said chamber; in the inner chamber there is mobile with reciprocating motion a plunger provided with a specially shaped groove arranged to vary the fuel pumping rate on varying the angular position of the plunger relative to the cylinder; in this respect by rotating said specially shaped groove the quantity of fuel positively fed to the engine explosion chamber for each delivery stroke varies because the quantity of fuel spilled from the inner chamber varies.
  • Said pumps are generally known as "reciprocating Bosch type with variable spill”.
  • each engine cylinder there is generally provided one pump fixed in a housing provided in the engine structure and connected by a fuel delivery pipe to the engine explosion chamber.
  • the pumps are generally disposed mutually aligned and are all connected to suitable means, such as rack means, for simultaneously rotating the various plungers about their respective axes on command, so as to control the fuel delivery rate to the engine, and also to suitable means, such as a camshaft, for reciprocatingly driving the various plungers synchronously with the strokes of the engine.
  • suitable means such as rack means
  • suitable means such as a camshaft
  • the cylindrical body of known pumps consists of several elements assembled together, and normally comprises an inner tubular element containing the inner chamber, enclosed by an outer casing. Between the outer casing and tubular element there is an annular space communicating both with the fuel feed pipe and with the inner chamber by way of said lateral inlet port. This annular space is kept constantly filled with fuel, which enters the inner chamber therefrom. In some cases the same port acts both as the fuel inlet and as the fuel spill port. In other cases a spill port separate from the inlet port is provided. In still further cases, two annular ducts are provided, one for the inlet port and the other for the spill port, but these are not isolated from each other. In all cases the fuel which enters the inner chamber is mixed, in greater or lesser proportion, with fuel which has previously been spilled from the inner chamber.
  • the object of the present invention is precisely to obviate the aforesaid drawback.
  • the invention as characterised in the claims also has the advantage of allowing the engine to be stopped rapidly and uniformly.
  • the illustrated pump comprises a body 2 particularly of substantially cylindrical form, provided with a perfectly cylindrical axial inner chamber 3.
  • the upper end of the chamber 3 communicates by way of a delivery valve, indicated overall by 16, with a pipe (not shown on the figure) for feeding fuel to the engine explosion chamber.
  • a fuel inlet bore 4 radially traverses the body 2 and opens into the inner chamber 3.
  • the bore 4 is directly connected to the fuel feed pipe (not shown on the figure) by a nipple 6 inserted into the bore 4 and partly projecting outwards.
  • a fuel spill bore 5 radially traverses the cylindrical body 2 and opens into the inner chamber 3.
  • Said bore 5 is distinct and separate from the bore 4, and specifically is positioned on the opposite side of the body 2 to the bore 4.
  • the bore 5 is connected directly to the fuel spill pipe (not shown on the figure), which leads to the fuel tank, by a nipple 7 inserted into the bore 5 and partly projecting outwards from the body 2.
  • a plunger 9 which is mobile with reciprocating motion within said chamber and is arranged to pump the fuel arriving through the bore 4.
  • Said plunger 9 is provided with an appropriate shaped-profile groove 10 of known type able to vary the amount of fuel pumped for each delivery stroke on varying the angular position of the plunger 9 relative to the cylindrical body 2.
  • valve 8 of the type which allows the fuel to leave the chamber 3 but prevents its return to the chamber 3.
  • said valve 8 consists of a small ball free to move along the bore in the nipple 7 and able to close said bore if the fuel tends to be drawn back into the chamber 3.
  • the lower end of the plunger 9 defines a stem 13 which emerges from the body 2 and on which there are disposed means 20 which rotate the plunger 9 on command.
  • the means 20 comprise a sleeve 21 which forms a prismatic fit with the stem 13, the stem 13 sliding freely in an axial direction within the sleeve 21 without being able to rotate relative to it.
  • the stem 13 comprises a pair of flat surfaces 22 arranged to slide in corresponding flat grooves provided in the axial bore of the sleeve 21.
  • the sleeve 21 is held in position at the lower end of the body 2 by a ring 24.
  • the helical return spring 23 for the plunger 9 is compressed between the ring 24 and a ring 25 retained by the enlarged end 26 of the stem 13.
  • a plate 30 For fixing the pump to the appropriate housing in the engine structure (indicated by A) there is provided a plate 30 with holes 31 which mate with the holes provided in the housing A, to allow fixing by screws 32. Said plate 30 generally differs as the characteristics of the housing A vary.
  • the plate 30 comprises a through hole 33 generally in a central position, through which the cylindrical body 2 is inserted as a exact fit.
  • the outer surface of the body 2 comprises an intermediate shoulder 34 against which the plate 30 rests.
  • Mutual locator means are provided on the portion 35 and on the plate 30 in a predetermined relative angular position. In this manner when the plate 30 is fitted to the body 2, said locator means ensure that the body 2 is orientated in a constant manner relative to the plate 30.
  • Said locator means comprise a pin 14 fixed, in proximity to the shoulder 34, on the outer surface of the portion 35 so that it projects radially therefrom, and a corresponding groove 15 provided in the plate 30 in a position corresponding with the hole 33 and arranged to contain the pin as an exact fit.
  • the pump is unable to redraw fuel from the spill pipe because of the action of the valve 8, and thus as there is no fuel in the pump the engine stops rapidly and uniformly, without jumping.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP88200365A 1987-03-09 1988-02-27 Pompe d'injection de combustible pour moteurs à combustion interne Ceased EP0285194A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4681887 1987-03-09
IT4681887U 1987-03-09

Publications (1)

Publication Number Publication Date
EP0285194A1 true EP0285194A1 (fr) 1988-10-05

Family

ID=11259148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88200365A Ceased EP0285194A1 (fr) 1987-03-09 1988-02-27 Pompe d'injection de combustible pour moteurs à combustion interne

Country Status (2)

Country Link
EP (1) EP0285194A1 (fr)
JP (1) JPS63253169A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1832740A1 (fr) * 2006-03-06 2007-09-12 Delphi Technologies, Inc. Pompe d'injection de carburant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE822543C (de) * 1950-04-18 1951-11-26 Siemens Schuckertwerke A G Elektrische Buegelmaschine mit Plaettmulde
DE822453C (de) * 1948-10-02 1951-11-26 Bosch Gmbh Robert Einspritzpumpe, insbesondere fuer leicht siedenden Kraftstoff
FR2482203A1 (fr) * 1980-07-01 1981-11-13 Bosch Gmbh Robert Procede et installation d'injection de carburant pour moteurs a combustion interne, notamment pour moteurs diesel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE822453C (de) * 1948-10-02 1951-11-26 Bosch Gmbh Robert Einspritzpumpe, insbesondere fuer leicht siedenden Kraftstoff
DE822543C (de) * 1950-04-18 1951-11-26 Siemens Schuckertwerke A G Elektrische Buegelmaschine mit Plaettmulde
FR2482203A1 (fr) * 1980-07-01 1981-11-13 Bosch Gmbh Robert Procede et installation d'injection de carburant pour moteurs a combustion interne, notamment pour moteurs diesel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1832740A1 (fr) * 2006-03-06 2007-09-12 Delphi Technologies, Inc. Pompe d'injection de carburant
US7395815B2 (en) 2006-03-06 2008-07-08 Delphi Technologies, Inc. Fuel injection pump

Also Published As

Publication number Publication date
JPS63253169A (ja) 1988-10-20

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