US3195465A - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

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Publication number
US3195465A
US3195465A US298959A US29895963A US3195465A US 3195465 A US3195465 A US 3195465A US 298959 A US298959 A US 298959A US 29895963 A US29895963 A US 29895963A US 3195465 A US3195465 A US 3195465A
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United States
Prior art keywords
valve
fuel
pump
pipe
bore
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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
US298959A
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English (en)
Inventor
Hug Hans-Rudolf
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.)
Schweizerische Lokomotiv und Maschinenfabrik AG (SLM)
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Schweizerische Lokomotiv und Maschinenfabrik AG (SLM)
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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
    • 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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines, particularly for diesel engines, for pumping fuel into a pipe terminating in a fuel injection valve connected to a cylinder of 4the internal combustion engine.
  • a space is provided accommodating a certain amount of fuel.
  • the pressure or outlet f valve element forming part of the fuel pump is provided with a cylindrical portion upstream of the valve seat whereby the outlet valve is closed before the valve element is seated on the valve seat.
  • This causes withdrawing of a predetermined volume of fuel from the pipe connecting the fuel pump and the fuel injection valve, before the pressure valve of the fuel pump is fully closed.
  • This conventional arrangement reduces the undulations in the fuel pipe if the amount of injected fuel is relatively small, and avoids undesired post-injection.
  • This conventional arrangement fails at greater rates of fuel injection as they occur at full load operation of supercharged engines.
  • a small leakage through the pressure valve of the fuel pump is provided so that when this pressure valve is fully closed and sits tightly on its seat a limited amount of fuel may pass from the pipe downstream of the fuel pump into the pump chamber.
  • FIG. l is a longitudinal section of a fuel injection pump according to the invention.
  • FIG. 2 is a part-sectional large scale View of a modified part of the fuel pump shown in FIG. l.
  • FIG. 3 is a longitudinal sectional View of the part j' shown in FIG. 2 provided with a check valve.
  • numeral 1 designates the casing of a fuel injection valve provided with a bushing 2 wherein a piston 3 recipro- Patented July 20, 1965 cates.
  • the piston 3 is moved against the action of a spring 6 by a cam 5 acting on a movable part 4 interposed between the cam 5 and the piston 3.
  • the latter is provided with inclined control edges in the conventional manner and is rotatable about its longitudinal axis, the rotation being effected by a worm drive arrangement 7.
  • Fuel is supplied t-o the casing 1 through a supply conduit 8.
  • the fuel ows through apertures 1t) in the bushing Z into a pump chamber or cylinder 9.
  • the upper end of the cylinder 9 is closed by a fuel discharge valve comprising a valve body 12 and a seat element 11.
  • the seat element 11 is pressed by means of a nipple 13 through a packing 14 onto the bushing 2.
  • a spring 15 is interposed between the nipple 13 and 4the valve member 12.
  • a pipe 16 terminating in an injection valve of the irlternal combustion engine, not shown, is connected in the conventional manner to the nipple 13.
  • the seat element 11 is provided with a bore 17 which connects the spaces upstream and downstream of the fuel discharge valve and permits by-passing of a predetermined amount of fuel around the valve.
  • bypass bore 17 provides a connection between the spaces upstream and downstream of the discharge valve, also when this valve is closed. In this way there is always a certain leakage permitted between the spaces ups-tream and downstream of the discharge valve which, as eX- perience has shown, prevents the undesired reflection of the pressure wave in the pipe 16 and postdripping.
  • FIGS. 2 and 3 show different means for providing an artificial leakage in the pump outlet valve.
  • FIG. 2 shows in enlarged scale a valve body 1S corresponding to the valve element 12 in FIG. l.
  • the valve body 18 has a cylindrical portion provided with an annular groove 2i? separating a guide portion 21 of the valve body from a cylindrical portion or collar 22. Adjacent to the collar .2 is a relatively large diameter collar 23 forming a valve seat surface 24.
  • the valve body 18 shown in FIG. 2 is provided with a central bore 25 having a small diameter part 26 at the outlet end of the valve body. Transverse bores 27 connect the bore 25 to the groove 2t).
  • the outlet end of the valve body 1S - is provided with a cylindrical boss 2S extending into one end 0f the spiral spring 15.
  • the bore 26 replaces the bore 17 in the valve seat element according -to FIG. l.
  • the bore 17 may be omitted when using the structure shown in FIG. 2.
  • FIG. 3 shows a valve body 30 whichy correspondsiothe valve body 1.8 shown in FIG. 2.
  • a check valve comprising a ball 31 and a coill *springV 3 2 are located within the bore 25.
  • One end of the Spring 3 2 fabutsagainst a tubular element 33 screwed intothe element 30; the second end of the spring abuts agaiujstkvthe ball 31; I
  • the structure shown in FIG. 3 provides a connection of the spaces downstream and upstream of the pump outlet 'valve duringa limited'period of time.
  • the connection is in eifect only if, due 'to a pressure wave ini'glie pipe 16, the pressure therein rise'sabov'e a predetermined value.l Otherwise, the effect of the modification shown in,
  • FIG. 3 is the same as that of kthe modicationshown in FIGS. 1 and '2.
  • f f Y It is obvious that the structure according to the invention is not limited tol an arrangement simultaneously usingthe well-known backow volume principle which is implemented bythe'collar 22..' v
  • the artificial leakage of the outlet valve of kthe fuel pumpg mayV befpr'oduced byother means'thanrbores in the valve elements.
  • Grooves may be providedfin 'the valve in the'conl valve seat..
  • Thepump housing maybe providedwith af conduit by-passing the valve seat element and, if desired,
  • anl adjustable throttling device may be interposed in the A' by-pass conduit whereby the leakage can be adjusted during operation.
  • a fuel injection pump having a pump cylinder having an open fuelrdelivery end and a plunger reciprocable in said pump cylinder: Y t l a discharge valve Iassembly adjacentvr said open end and Y Y havingvan inlet at said open end and an outlet distant from said open end,
  • said dischargefvalve assembly having :a valve housing connected to said pump cylinder and having a conical valve seat distant from said open end, ⁇ Y

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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)
US298959A 1962-08-09 1963-07-31 Fuel injection pump Expired - Lifetime US3195465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH949962A CH394710A (de) 1962-08-09 1962-08-09 Brennstoffeinspritzpumpe für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3195465A true US3195465A (en) 1965-07-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
US298959A Expired - Lifetime US3195465A (en) 1962-08-09 1963-07-31 Fuel injection pump

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US (1) US3195465A (de)
CH (1) CH394710A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439705A (en) * 1967-01-09 1969-04-22 Ford Motor Co Fluid flow control valve assembly
US3695784A (en) * 1969-06-09 1972-10-03 Mitsubishi Heavy Ind Ltd Fuel injection pump construction
US4459086A (en) * 1981-09-04 1984-07-10 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
US4467767A (en) * 1981-03-21 1984-08-28 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
US4648369A (en) * 1984-05-10 1987-03-10 Robert Bosch Gmbh Pressure valve
US4651779A (en) * 1985-10-22 1987-03-24 Weber S.P.A. Azienda Altecna Constant-pressure delivery valve for fuel injection pumps for diesel engines
US4692102A (en) * 1981-09-25 1987-09-08 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
FR2607554A1 (fr) * 1986-11-27 1988-06-03 Daimler Benz Ag Pompe d'injection de carburant a commande par rampe oblique pour moteur a combustion interne, notamment pour moteur a injection directe pour vehicules utilitaires
USD802717S1 (en) * 2015-08-19 2017-11-14 Kabushiki Kaisha Fujikin Valve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3202405C2 (de) * 1981-03-21 1994-09-01 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE3341575C2 (de) * 1983-11-17 1996-06-05 Bosch Gmbh Robert Druckventil für Kraftstoffeinspritzpumpen
DE3631002C2 (de) * 1985-09-17 1996-04-04 Zexel Corp Kraftstoffeinspritzvorrichtung
DE3910793C2 (de) * 1989-04-04 1996-05-23 Kloeckner Humboldt Deutz Ag Brennstoffeinspritzvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH144671A (de) * 1929-12-23 1931-01-15 Bosch Robert Ag Brennstoffpumpe für Brennkraftmaschinen mit luftloser Brennstoffeinspritzung.
US2090781A (en) * 1933-07-12 1937-08-24 Atlas Diesel Ab Fuel pump for internal combustion engines
US2463374A (en) * 1945-02-26 1949-03-01 Aircraft & Diesel Equipment Co Fuel injection pump
US2797644A (en) * 1953-06-29 1957-07-02 Bosch Arma Corp Fuel injection pump
US2888876A (en) * 1958-01-17 1959-06-02 Alco Products Inc Fuel injection equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH144671A (de) * 1929-12-23 1931-01-15 Bosch Robert Ag Brennstoffpumpe für Brennkraftmaschinen mit luftloser Brennstoffeinspritzung.
US2090781A (en) * 1933-07-12 1937-08-24 Atlas Diesel Ab Fuel pump for internal combustion engines
US2463374A (en) * 1945-02-26 1949-03-01 Aircraft & Diesel Equipment Co Fuel injection pump
US2797644A (en) * 1953-06-29 1957-07-02 Bosch Arma Corp Fuel injection pump
US2888876A (en) * 1958-01-17 1959-06-02 Alco Products Inc Fuel injection equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439705A (en) * 1967-01-09 1969-04-22 Ford Motor Co Fluid flow control valve assembly
US3695784A (en) * 1969-06-09 1972-10-03 Mitsubishi Heavy Ind Ltd Fuel injection pump construction
US4467767A (en) * 1981-03-21 1984-08-28 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
US4459086A (en) * 1981-09-04 1984-07-10 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
US4692102A (en) * 1981-09-25 1987-09-08 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
US4648369A (en) * 1984-05-10 1987-03-10 Robert Bosch Gmbh Pressure valve
US4651779A (en) * 1985-10-22 1987-03-24 Weber S.P.A. Azienda Altecna Constant-pressure delivery valve for fuel injection pumps for diesel engines
FR2607554A1 (fr) * 1986-11-27 1988-06-03 Daimler Benz Ag Pompe d'injection de carburant a commande par rampe oblique pour moteur a combustion interne, notamment pour moteur a injection directe pour vehicules utilitaires
USD802717S1 (en) * 2015-08-19 2017-11-14 Kabushiki Kaisha Fujikin Valve

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Publication number Publication date
CH394710A (de) 1965-06-30

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