US3901204A - System for supplying fuel to internal combustion engines - Google Patents

System for supplying fuel to internal combustion engines Download PDF

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Publication number
US3901204A
US3901204A US421870A US42187073A US3901204A US 3901204 A US3901204 A US 3901204A US 421870 A US421870 A US 421870A US 42187073 A US42187073 A US 42187073A US 3901204 A US3901204 A US 3901204A
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United States
Prior art keywords
fuel
pump
pressure
fuel pump
diaphragm
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 - Lifetime
Application number
US421870A
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English (en)
Inventor
Eric Jaulmes
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.)
MBK Industrie SA
Original Assignee
Ateliers de la Motobecane SA
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Publication date
Application filed by Ateliers de la Motobecane SA filed Critical Ateliers de la Motobecane SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • 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
    • F02M59/12—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps having other positive-displacement pumping elements, e.g. rotary
    • F02M59/14—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps having other positive-displacement pumping elements, e.g. rotary of elastic-wall type
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/02—Pumps peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00

Definitions

  • ABSTRACT Foreign Application Priority Data A system for supplying fuel to internal combustion en- Dec. 27, 1972 France 72.46291 gines by medium pressure injection including a pressurized fuel tank, a specially designed fuel pump and [52] US. Cl... 123/139 A; 123/32 AE; 123/139 AW an electromagnetic fuel injector.
  • the pump is a dia- [51] Int.
  • the fuel line with a carburetor and pressurized present invention relates to a system for Supply 5 tank where the successive functions are accomplished ing fuel to internal combustion engine by means of a by: fuel injector, and more particularly to an improved a Pressunzed tank (feed) I pump for supply fuel from a storage tank to the injeca Fonstam'level chamber (regulahon) tor a et (control of flow).
  • fuel injector and more particularly to an improved a Pressunzed tank (feed) I pump for supply fuel from a storage tank to the injeca Fonstam'level chamber (regulahon) tor a et (control of flow).
  • y pump mainly include ensuring flow at sufficient presmeahs of 3 P p usually of the dlaphragm yp p sure for the fuel to enter a constant-level chamber h at a rathef 10W pressulje f the Order P 200 g/cmzi which is generally located slightly above the pump, and y a Pressurized tank z creates a 'P to limit the feed pressure when the jet is delivering a sure level to 30 y a Volumemc P p P- small volume so as not to disturb the level in the float eratmg at a pressure level of the order of several kiloh b m ln known fuel lines of type 2 herein
  • the control of i flow function can be accompl shed.
  • a fuel line which allows an amount to pass which is a function of several parameters: pressure, cross- The Principal Object of the Present Invention 15 to section and opening time.
  • one of these pa- Provide a Simplified fuel line which pp gasoline t0 r r i m bn d d h others remain t t an engine whose carburetion is controlled by an orifice
  • v v of a pump a pressure-regulating element which ensures The profile fi (needle'prolectfon h Seat) regulated f l pressure, d a control element which 2.
  • the cross-section of the passageway is variable and serves to measure the amount of fuel fed into the cylin- ,comrolled (Opemng and the crosssectlon Versus d t x I travel of the needle relationship).
  • the downstream pressure is known (depression in lowing types of systems: the make nozzle) I v 4O 4.
  • The-upstream pressure 18 known and regulated to The com/6mm" nowadays fuel leading to the uwaconstant value, with the pressure being created by a tor where the successive functions are carried Out by; diaphragm pump connected mechanically to the cra ka diaphragm pump (feed) 7 l shaft of the engine. its function is simultaneously to ena constant-level chamber (regulation) sure feed to the controlling element (electromagnetic a jet (control of flow) 7 injector) and to ensure a constant pressure in the fuel 2.
  • the fuel injection system with electromagnetic line. control, where the successivefunc tions are carried out The following comparative table summarizes the by: I j above.
  • the invention consists in achieving a novel combination of a pressurized tank with a special diaphragm pump, designed, on the one hand, to function as a feed from said tank, and, on the other hand, for the purpose of supplying an injector at a constant pressure, as is always necessary, but without using a regulating element.
  • the injector is advantageously in conformity with the following patent applications of the assignee:
  • Such a fuel supply line is characterized by a single average pressure level between the feed element and the control element, without any additional element for regulating the pressure.
  • a novel feature of the fuel line thus conceived consists in the different operating conditions of the principal element, i.e., the pump.
  • FIG. 1 is an explanatory graph of fuel pressure as a function of flow for the special diaphragm pump in accordance with the present invention in comparison with a conventional diaphragm pump.
  • FIG. 2 is an explanatory graph showing the available flow from the pump in accordance with the present invention as a function of the number of strokes per minute of the engine for a given pressure, and the maximum demand of the engine.
  • FIG. 3 is a diagram indicating the pressures in the various portions of a conventional automobile carburetor fuel supply system.
  • FIG. 4 is a diagram indicating the pressures in the various portions of a conventional injection fuel supply system.
  • FIG. 5 is a diagram indicating the pressures in the various portions of a conventional carburetor with pressurized tank fuel supply system.
  • FIG. 6 is a diagram indicating the pressures in the various portions of a fuel supply system in accordance with the present invention.
  • FIG. 7 represents as an example, in axial section, of a diaphragm feed pump in accordance with the invention.
  • the characteristic curve (at constant velocity) of the pressure as a function of the flow shows a favored zone (c) where the pump pressure remains constant while the flow remains below a certain level D.
  • the pump designed according to the present invention therefore, consists, on the one hand, of a diaphragm with a reduced area, in an average ratio of 3:1 (for example) in comparison to a conventional pump, and on the other hand a return spring for this diaphragm which is essentially more rigid than the conventional spring and which exercises a force which is on the average twice as great.
  • the effective area of the diaphragm is at most 400 square millimeters and the force exercised by the return spring is at least 3 kg.
  • a pump designed for a 350 cubic centimeter motorcycle engine has an effective diaphragm area of 300 square millimeters and the force exercised by the spring amounts to 6 kg.
  • the pump output pressure is 2 kg/cm and the flow is 12 liters/hour for 2,500 strokes per minute.
  • a conventional pump designed for a l,000l,500 cubic centimeter automobile engine has an effective diaphragm area of about 1,200 square millimeters and the spring exercises a force of 1.5 kg.
  • the pump output pressure is grams/cm and the flow is 25 liters/hour at 1,000 strokes per minute.
  • FIG. 1 we have shown for 2,000 strokes/minute the characteristic curve (a) for the flow versus pressure for such a pump plotted with a dot-dash curve, and the characteristic curve (b) of a classic pump plotted with a dashed line.
  • the diaphragm has a smaller area, but the stroke is comparable to that of conventional diaphragm pumps, the volume displaced with each cycle is low, although it is sufficient to satisfy the demand of the engine, and the gear ratio between the crankshaft and the pump is therefore selected appropriately.
  • This low volume still does not allow the pump to assume in a satisfactory fashion (especially during starting), the function of aspiration from a tank located below the level of the pump and the pump is therefore combined with a tank located above the pump level.
  • Means will preferably be included to eliminate gasoline vapor blocks in the system in which the reservoir is located above the level of the pump.
  • the lines will be provided with conventional means; the pump advantageously situated at a level which is very slightly above that of the injectors and a very low-volume bypass (very small diameter tube) which will connect the output and input.
  • This pump has associated with it a flexible hose which is used to eliminate the slight fluctuations in pressure in the line relative to the average pressure level, playing the role of a capacitor, since these slight fluctuations can occur when the injectors are working and when the pump diaphragm spring is put under ten-
  • This resilient hose connected to injector 26, is represented by in P16. 7, which shows a simple example of a modified diaphragm pump according to the invention.
  • a cam 11 cut in shaft 12 driven by the engine crankshaft through the necessary reduction gears acts on a push rod 13 which in turn moves a rocker arm 14.
  • the latter deforms diaphragm 15 which, according to the invention, has a useful diameter which is significantly smaller than that of conventional diaphragms, its area being (for example) about three times smaller.
  • the return spring 16 of this diaphragm is itself reinforced so as to exert a force which is about twice that of a conventional pump.
  • the intake nozzle is represented by 17 and the outlet nozzle is represented by 18.
  • Valves 19 and 20 are associated respectively with each of these two nozzles.
  • a system for supplying fuel to internal combustion engines by medium pressure injection comprising:
  • a diaphragm-type fuel pump means for supplying fuel from said tank to said injector, said fuel pump means having an inlet, an outlet, a diaphragm and a spring return means;
  • linkage means for driving said fuel pump at a speed proportional to that of the engine
  • the effective diaphragm area in said fuel pump means is at most 400 square millimeters and the force exercised by said spring return means is at least 3 kg
  • said means for causing fuel to enter the intake of said fuel pump means at a predetermined pressure comprises means for locating said tank above the level of said pump.
  • said means for causing fuel to enter the intake of said fuel pump means at a predetermined pressure comprises an auxiliary pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)
US421870A 1972-12-27 1973-12-05 System for supplying fuel to internal combustion engines Expired - Lifetime US3901204A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7246291A FR2211980A5 (enrdf_load_stackoverflow) 1972-12-27 1972-12-27

Publications (1)

Publication Number Publication Date
US3901204A true US3901204A (en) 1975-08-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US421870A Expired - Lifetime US3901204A (en) 1972-12-27 1973-12-05 System for supplying fuel to internal combustion engines

Country Status (4)

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US (1) US3901204A (enrdf_load_stackoverflow)
JP (2) JPS4996128A (enrdf_load_stackoverflow)
DE (1) DE2345492A1 (enrdf_load_stackoverflow)
FR (1) FR2211980A5 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281797A (en) * 1978-07-26 1981-08-04 Ntn Toyo Bearing Company, Limited Fuel injection device for internal combustion engines
USD325386S (en) 1989-10-06 1992-04-14 Sergi Paul D Combined adjustable fuel line and in-line filter
US5323750A (en) * 1993-08-25 1994-06-28 Kohler Co. Integral engine valve cover and fuel pump
US6357424B1 (en) * 1999-02-22 2002-03-19 Suzuki Kabushiki Kaisha Fuel pump unit of motorcycle
US20110048378A1 (en) * 2009-08-26 2011-03-03 Hyundai Motor Company Fuel supplying system of lpi engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6393440U (enrdf_load_stackoverflow) * 1986-12-08 1988-06-16

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062644A (en) * 1931-06-09 1936-12-01 Ensign Carburetor Co Ltd Injection engine and fuel injection device
US3363614A (en) * 1967-01-27 1968-01-16 Gary L. Fisher Fuel injection system
US3724435A (en) * 1970-01-29 1973-04-03 Holley Carburetor Co Remote metering system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062644A (en) * 1931-06-09 1936-12-01 Ensign Carburetor Co Ltd Injection engine and fuel injection device
US3363614A (en) * 1967-01-27 1968-01-16 Gary L. Fisher Fuel injection system
US3724435A (en) * 1970-01-29 1973-04-03 Holley Carburetor Co Remote metering system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281797A (en) * 1978-07-26 1981-08-04 Ntn Toyo Bearing Company, Limited Fuel injection device for internal combustion engines
USD325386S (en) 1989-10-06 1992-04-14 Sergi Paul D Combined adjustable fuel line and in-line filter
US5323750A (en) * 1993-08-25 1994-06-28 Kohler Co. Integral engine valve cover and fuel pump
US6357424B1 (en) * 1999-02-22 2002-03-19 Suzuki Kabushiki Kaisha Fuel pump unit of motorcycle
US20110048378A1 (en) * 2009-08-26 2011-03-03 Hyundai Motor Company Fuel supplying system of lpi engine
US8251045B2 (en) * 2009-08-26 2012-08-28 Hyundai Motor Company Fuel supplying system of LPI engine

Also Published As

Publication number Publication date
JPS4996128A (enrdf_load_stackoverflow) 1974-09-11
DE2345492A1 (de) 1974-07-18
JPS5340123U (enrdf_load_stackoverflow) 1978-04-07
FR2211980A5 (enrdf_load_stackoverflow) 1974-07-19

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