US3893629A - Fuel injection device for diesel engines - Google Patents

Fuel injection device for diesel engines Download PDF

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Publication number
US3893629A
US3893629A US499591A US49959174A US3893629A US 3893629 A US3893629 A US 3893629A US 499591 A US499591 A US 499591A US 49959174 A US49959174 A US 49959174A US 3893629 A US3893629 A US 3893629A
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US
United States
Prior art keywords
fuel
plunger
chamber
pressure generating
generating device
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
US499591A
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English (en)
Inventor
Kazuo Okamoto
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.)
Bosch Corp
Original Assignee
Diesel Kiki Co Ltd
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 Diesel Kiki Co Ltd filed Critical Diesel Kiki Co Ltd
Application granted granted Critical
Publication of US3893629A publication Critical patent/US3893629A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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

Definitions

  • ABSTRACT A fuel injection device for Diesel engines in which the controlling of an amount of fuel is effected by an electromagnetic valve and the changing of an injection timing is made by a plunger.
  • This invention relates to a fuel injection device for Diesel engines and more particularly to improvement in a high pressure fuel injection device in which the controlling of an amount of fuel is effected by means of an electromagnetic valve and the changing of an injection timing is made by means of a plunger.
  • An object of this invention is to provide a fuel injection device for Diesel engines in which a period of fuel injection is made constant with respect to a cam speed as conventional row-type fuel injection pumps for Diesel engines and combustion noise is reduced.
  • FIG. I is a view showing a basic structure of a fuel injection device according to this invention.
  • FIG. 2 is a sectional view of a pressure generating device and FIG. 3 is an operation period diagram of an electromagnetic valve, a fuel pressure diagram, fuel pressure curves and fuel injection curves.
  • a fuel tank 1 is connected through a filter 2 to a suction side of a fuel supply pump 3.
  • a relief valve 4 and an accumulator 5 In a discharge portion of the fuel supply pump 3 are provided a relief valve 4 and an accumulator 5.
  • the tank I is further connected through an electromagnetic valve 7, a check valve 8 and a fixed throttle member 9, said electromagnetic valve 7 being able to be operated by means of a control circuit 6 having inputs of a load detector circuit 6a and an atomosphere temperature detector circuit 6b, to a plunger chamber 12 provided below a small diameter portion 11b of a servopiston I I which comprises a large diameter portion 11a within a body and further to an injection nozzle 13.
  • the electromagnetic valve 7 as described above is operated by means of the control circuit 6 corresponding to operation of an engine, and constructed to, in its position I, close the passage between the oil supply pump 3 and the plunger chamber 12 and in its position II, open it.
  • a piston chamber 14 which is provided in the upper part of the large diameter portion 11a of the servopiston 11, includes a spring 14a which depresses the servopiston I1 downwardly and is connected to a fuel tank 1 through a pressure generating device 15 shown in FIG. 2. Between the pressure generating device 15 and the servopiston chamber 14 is provided a relief valve 16 which acts to return fuel to the fuel tank 1 when the fuel pressure supplied from the pressure generating device 15 exceeds a pressure sufficient for displacing the servopiston.
  • the pressure generating device 15 comprises a plunger 15b which is slidably fitted oil tightly in a barrel 15a as shown in FIG. 2.
  • the plunger 15b is reciprocally moved by rotation ofa cam C to provide an identical amount of fuel under pressure and is formed with an upper notch 15c and a lower notch 150' in order to vary timing of fuel injection, said notches 15c and 15a being communicated through a longitudinal groove lSe and being constructed to be inclined to vary the timing of the injection by rotation of the plunger 15b.
  • the fuel under pressure is supplied when a passage hole 15]" provided in the barrel is closed between the notches 15c and 15d.
  • the plunger head portion is connected to the servopiston chamber 14 and the passage hole 15f is connected to the fuel tank 1.
  • the period of time which the electromagnetic valve is in the position II is that of the fuel supplied to the plunger chamber 12. By changing such period of time it is possible to have an amount of supplied fuel varied and obtain a changed injection amount 0 of the fuel.
  • a shorter time pulses 1 II and l I are obtained as shown by the solid line in FIG. 3 (I) and as seen from servopiston displacement S shown by the solid line in FIG. 3(3), a lifting amount of the servopiston is reduced, that is, an amount of the fuel supplied in the plunger chamber is lessened so that an injection amount ofthe fuel is reduced.
  • the period of time which the electromagnetic valve is in the position I covers the other period of time.
  • the fuel charging period of time in the position II, as seen from FIG. 3(2) showing a variation diagram of a supplied fuel under pressure P by the pressure generating device 15, is the period during which the plunger 5b move downwardly to prepare a next fuel supply under pressure, the upper notch is situated below the passage hole 15f and the servopiston chamber 14 is connected to the fuel tank 1, that is, the period during which the plunger 15b does not close the passage hole 15f.
  • the fuel supplied through the filter 2 from the fuel tank I by the oil supply pump 3 may be controlled in its pressure by the relief valve 4 and is stored in the accumulator 5.
  • the fuel as stored in the accumulator 5 is supplied through the check valve 8 and the fixed throttle member 9 to the plunger chamber 12 so as to move upwardly the servopiston ll against force of the spring 14a.
  • the fuel in the servopiston chamber ]4 may pass through the longitudinal groove 15e provided on the plunger 15b, the notch 15d and the passage hole 15]" and is returned to the fuel tank I.
  • the electromagnetic valve 7 As the fuel amount required for an engine and associating with the fuel supply pressure and the time of the fuel supply pump 3 enters the plunger chamber 12, the electromagnetic valve 7 is in the position I to prepare for a next fuel injection.
  • a signal for actuating the electromagnetic valve may be obtained by conventional means such as means for obtaining rotary phase of the cam shaft of the pump.
  • the plunger of the fuel generating device 15 As the plunger of the fuel generating device 15 is raised and the passage hole 15f is closed between the notches 15c and 15d of the plunger 15b, the fuel is supplied to the servopiston chamber 14 so that the fuel in the plunger chamber 12 is injected through the injection nozzle 13.
  • the servopiston 11 comes to a lower end position before the pressure generating device 15 cuts off the fuel supply and thus the pressure in the servopiston chamber 14 may rise higher than it is necessary. Therefore, in order to prevent the rise of the pres sure is provided the relief valve 16 which is operated to communicate the fuel under pressure to the fuel tank 1 so as to prevent the excessive rise of the pressure.
  • the pressure generating device interrupts the fuel supply and thus the fuel injection is completed. In order to prepare a next fuel supply the plunger 15b moves downwards.
  • the pressure source serving to move the servopiston ll downwards for the fuel injection is obtained by a combination of the cam and the plunger.
  • the cam is operated in synchronism with rotation of an engine so that the injection of the plunger will increase higher with increase of rotation of the engme.
  • a fuel injection device for Diesel engines comprising a body including a large diameter portion and a small diameter portion of a servopiston to define a piston chamber, a counter piston chamber and a plunger chamber, a pressure generating device having a relief valve at the outlet side thereof and connected to said piston chamber, said pressure generating device including a plunger with inclined notches determining period and time of pressure generating operable synchronously to rotation of an engine, a fuel tank connected to said counter piston chamber, an injection nozzle in the body connected to said plunger chamber, a check valve preventing fuel from flowing out of said plunger chamber, and electromagnetic valve for closing and opening a passage of fuel under pressure and a fuel supply pump connected at the outlet side thereof through said electromagnetic valve and said check valve to said plunger chamber, whereby said pressure generating device and said electromagnetic respectively control piston strokes in fuel injection direction and fuel intake direction.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US499591A 1973-08-29 1974-08-22 Fuel injection device for diesel engines Expired - Lifetime US3893629A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48096954A JPS5754620B2 (en, 2012) 1973-08-29 1973-08-29

Publications (1)

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US3893629A true US3893629A (en) 1975-07-08

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ID=14178661

Family Applications (1)

Application Number Title Priority Date Filing Date
US499591A Expired - Lifetime US3893629A (en) 1973-08-29 1974-08-22 Fuel injection device for diesel engines

Country Status (2)

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US (1) US3893629A (en, 2012)
JP (1) JPS5754620B2 (en, 2012)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2738295A1 (fr) * 1995-08-30 1997-03-07 Bosch Gmbh Robert Systeme d'injection de carburant dans un moteur a combustion interne
WO2001023753A1 (de) * 1999-09-24 2001-04-05 Robert Bosch Gmbh Kraftstoffeinspritzsystem für brennkraftmaschinen
US6454238B1 (en) * 2001-06-08 2002-09-24 Hoerbiger Kompressortechnik Services Gmbh Valve
FR2829804A1 (fr) * 2001-09-17 2003-03-21 Bosch Gmbh Robert Injecteur pour installation d'injection de carburant avec amplification de pression
US20040020464A1 (en) * 2001-06-01 2004-02-05 Wolfgang Braun Fuel injection device comprising a pressure amplifier
US20040089269A1 (en) * 2001-06-01 2004-05-13 Wolfgang Braun Fuel injection device with a pressure booster
US20130081377A1 (en) * 2010-06-22 2013-04-04 Robert Bosch Gmbh Device and method for metering a liquid into the exhaust tract of an internal combustion engine
CN106423602A (zh) * 2013-10-28 2017-02-22 合肥智慧殿投资管理有限公司 一种可变流量喷头

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS575542A (en) * 1980-06-14 1982-01-12 Diesel Kiki Co Ltd Fuel injection unit
JPS5738658A (en) * 1980-08-15 1982-03-03 Nippon Denso Co Ltd Fuel injector
JPS58148265A (ja) * 1982-02-25 1983-09-03 Diesel Kiki Co Ltd 燃料噴射装置
JPS58148266A (ja) * 1982-02-25 1983-09-03 Diesel Kiki Co Ltd 燃料噴射装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1504773A (en) * 1922-03-31 1924-08-12 Marston Sheldon Electromagnetic valve
US1664609A (en) * 1924-07-28 1928-04-03 Louis O French Fuel-injection system
US3610529A (en) * 1968-08-28 1971-10-05 Sopromi Soc Proc Modern Inject Electromagnetic fuel injection spray valve
US3705692A (en) * 1970-02-13 1972-12-12 Roto Diesel Sa Electromagnetic injectors
US3797756A (en) * 1972-03-03 1974-03-19 Bosch Gmbh Robert Electromagnetically actuated fuel injection valve for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1504773A (en) * 1922-03-31 1924-08-12 Marston Sheldon Electromagnetic valve
US1664609A (en) * 1924-07-28 1928-04-03 Louis O French Fuel-injection system
US3610529A (en) * 1968-08-28 1971-10-05 Sopromi Soc Proc Modern Inject Electromagnetic fuel injection spray valve
US3705692A (en) * 1970-02-13 1972-12-12 Roto Diesel Sa Electromagnetic injectors
US3797756A (en) * 1972-03-03 1974-03-19 Bosch Gmbh Robert Electromagnetically actuated fuel injection valve for internal combustion engines

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2738295A1 (fr) * 1995-08-30 1997-03-07 Bosch Gmbh Robert Systeme d'injection de carburant dans un moteur a combustion interne
WO2001023753A1 (de) * 1999-09-24 2001-04-05 Robert Bosch Gmbh Kraftstoffeinspritzsystem für brennkraftmaschinen
US6446603B1 (en) * 1999-09-24 2002-09-10 Robert Bosch Gmbh Fuel injection system for internal combustion engines, and method for injecting fuel into the combustion chamber of an internal combustion engine
US20040020464A1 (en) * 2001-06-01 2004-02-05 Wolfgang Braun Fuel injection device comprising a pressure amplifier
US20040089269A1 (en) * 2001-06-01 2004-05-13 Wolfgang Braun Fuel injection device with a pressure booster
US6895935B2 (en) * 2001-06-01 2005-05-24 Robert Bosch Gmbh Fuel injection device comprising a pressure amplifier
US6938610B2 (en) * 2001-06-01 2005-09-06 Robert Bosch Gmbh Fuel injection device with a pressure booster
US6454238B1 (en) * 2001-06-08 2002-09-24 Hoerbiger Kompressortechnik Services Gmbh Valve
FR2829804A1 (fr) * 2001-09-17 2003-03-21 Bosch Gmbh Robert Injecteur pour installation d'injection de carburant avec amplification de pression
US20130081377A1 (en) * 2010-06-22 2013-04-04 Robert Bosch Gmbh Device and method for metering a liquid into the exhaust tract of an internal combustion engine
US9556768B2 (en) * 2010-06-22 2017-01-31 Robert Bosch Gmbh Device and method for metering a liquid into the exhaust tract of an internal combustion engine
CN106423602A (zh) * 2013-10-28 2017-02-22 合肥智慧殿投资管理有限公司 一种可变流量喷头

Also Published As

Publication number Publication date
JPS5047033A (en, 2012) 1975-04-26
JPS5754620B2 (en, 2012) 1982-11-19

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