US3910724A - Fuel injection pump for internal combustion engines - Google Patents

Fuel injection pump for internal combustion engines Download PDF

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Publication number
US3910724A
US3910724A US415411A US41541173A US3910724A US 3910724 A US3910724 A US 3910724A US 415411 A US415411 A US 415411A US 41541173 A US41541173 A US 41541173A US 3910724 A US3910724 A US 3910724A
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US
United States
Prior art keywords
fuel
pressure
pump
piston
relief channel
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
US415411A
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English (en)
Inventor
Katashi Okamoto
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Robert Bosch GmbH
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Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3910724A publication Critical patent/US3910724A/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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/121—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor with piston arranged axially to driving shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
    • F02D2700/02—Controlling by changing the air or fuel supply
    • F02D2700/0269—Controlling by changing the air or fuel supply for air compressing engines with compression ignition
    • F02D2700/0282—Control of fuel supply
    • F02D2700/0284—Control of fuel supply by acting on the fuel pump control element

Definitions

  • a portion of the fuel feed quantity of the fuel injection quantity is caused to flow off through the relief channel in order to alter the fuel injection quantity by regulating the relief channel and by displacing the cam drive by the control piston under the influence of [561 Memes 31121163111211?12125321 ifi alllfin ihl fiifl UNITED STATES PATENTS tant pressure of the fuel feed quantity which flows BiSchOff through the relief channel erves as a ontrol pressure 2,765,741 10/1956 Hogeman 41 7/289 for the pressure regulating valve 2,810,376 10/1957 Aldmger 417/294 3,358,662 12/1967 Kulke 123/139 R 4 Claims, 2 Drawing Figures 25b 34 l V 23 27 n 2213 33 v 29 n 48b 43 30 2 5 28G l 37 47 470 44 t- I l g a V ⁇ I. 9
  • the present invention relates to a fuel injection pump for internal combustion engines having a pump piston driven by a cam drive, in which a portion of the fuel feed quantity flows off in order to alter the fuel injection quantity by regulating a relief channel of the pump working chamber, and changing the moment of injection by displacing the cam drive with a piston which is acted upon by the rpm dependent pressure of a pump driven synchronously with the injection pump piston.
  • the injection moment In injection pumps of this construction the injection moment, as the rpm of the internal combustion engine provided with such an injection pump increases, is shifted to early" by means of increasing hydraulic pressure.
  • the injection moment was controlled in the above described manner, that is in accordance with the rpm of the internal combustion engine, the injection moment has not been controlled in accordance with engine load.
  • the injection moment was set in such a manner that the optimum injection moment was achieved either at the full load setting of the internal combustion engine or at the' partial load setting thereof.
  • the injection moment occurred too early with respect to the partial load range, thereby causing increased combustion noise.
  • the injection moment was optimized to correspond to the partial load range of the internal combustion engine, then it occurred too late with respect to the full load range, thereby resulting in a power loss.
  • an object of the present invention to eliminate the above noted disadvantages and to provide a fuel injection pump for internal combustion engines in which the injection moment can be controlled in accordance with the load of the internal combustion engine, and by means of which an optimum injection moment is obtained at any given time and for all operational conditions of an internal combustion engine.
  • An advantageous embodiment of the present invention consists in that the control point of the relief channel is connected to the fuel reservoir through a return line'having a throttle wherein, downstream of the throttle, a connecting line branches off to the pressure regulating valve.
  • a regulating pressure can be advantagesously built up by utilization of the above described throttle, which pressure acts upon the pressure regulating valve through the connecting line.
  • FIG. 1 illustrates partially in cross section the essential cooperating elements of the improved fuel injection pump for internal combustion engines including a pressure regulating valve according to one embodiment of the present invention. 7
  • FIG. 2 illustrates partially in cross section the essential cooperating elements of the improved fuel injection pump for internal combustion engines including a pressure regulating valve according to another embodiment of the present invention.
  • a drive shaft 2 which serves to drive a pump piston 5.
  • the pump piston 5 is pressed into the cam plate 6 by means of an axial spring 35, and is thereby connected for rotation therewith.
  • the cam plate 6 is rotated by means of the drive shaft 2, and is thereby driven over rollers 3 which rest on a rotatably disposed roller ring 4 in the pump housing 1.
  • the piston 5 is simultaneously placed into both rotation and reciprocating motion by the cam plate 6.
  • the cam plate 6 is reciprocated by the contact with the rollers 3 in a well known manner. See, for example,- US. Pat. No. 3,630,643.
  • the bore 5b is connected with a relief channel 50 developed as an axial pocket bore.
  • the fuel feed period that is the period during which the fuel is fed to the injection nozzle 12, is that period of time which starts from the moment in which, for example, the feed channel 8, as it can be seen in the drawing, is connected with the traverse distributor groove 50 (injection beginning), and lasts to the moment when the transverse bore 5b is freed from the revolving slide ring 7 during the feed stroke of the piston 5 (injection end).
  • a pin 14 is provided on the roller ring 4 on which a lever 13 is mounted for rotation in a plane which is directed vertically to the plane of the drawing.
  • the roller ring 4 is rotated about the axis of the drive shaft 2 also in a plane which is directed vertically to the plane of the drawing.
  • the roller ring 4 is rotated by means of the rotating motion of the lever 13.
  • a control piston 16 is disposed in a cylinder 15 in the pump'housing l.
  • the lever l3 is actuated by displacing the piston 16.
  • the control piston 16 is shown rotated by'90 for clarity of discussion. As such, the piston 16 moves in a direction which is vertical to the plane of the drawing.
  • a rod 39 is secured to the piston 16 so as to move solidly therewith and a connecting rod 40 is provided between the rod 39 and the lever 13 to transmit the movement of the piston 16 to the lever 13, thus rotating the lever 13 in the plane which is vertical to the plane of the drawing.
  • the end face 16 of the piston 16 together with the cylinder defines a pressure chamber 21, while the end face 16" is acted upon by a spring 37 situated within the chamber 38 defined by the end face 16" and the cylinder 15.
  • the pressure chamber 21 is connected by a pressure line with a first feed pump 17 actuated by the internal combustion engine E.
  • the feed pump 17 draws fuel from a fuel reservoir 18 through a pipe line 19 and feeds the fuel through the pressure line 20 into the pressure chamber 21.
  • the piston 16 is thus displaced more or less against the force of the spring 37 in accordance with the magnitude of the feed pressure, so that the lever 13 is moved correspondingly and the roller ring 4 is turned.
  • a connecting line 22a branches off from the pressure line 20 and leads to a pressure control valve 32. From the control valve 32 a connecting line 22b leads to a bypass line b, which line discharges into the fuel reservoir 18.
  • the supply of fuel to the fuel injection pump occurs through a second feed pump 23, the pressure side of which is connected with the fuel suction channel 9, while the suction side thereof is connected with the fuel reservoir 18 through a channel 34.
  • the second fuel pump 23 is also actuated by the internal combustion engine E, and it should be noted that it is of course possible to forego the second fuel pump 23 and to additionally connect the feed side of the fuel pump 17 with the fuel suction channel 9 (FIG. 2).
  • the displacement of the revolving slide ring 7 occurs by means of an eccentric pin 41, a rod 42 and a lever 26.
  • the rod 42 is rotatably mounted on the housing.
  • the eccentric pin 41 engages a recess 70 of the ring 7.
  • a shield element 43 is provided between the housing and the rod 42.
  • the lever 26 connects the rod 42 and an acceleration lever (not shown). Therefore the movement of the acceleration lever is converted to displace the ring 7 to the left or to the right in accordance with the acceleration lever.
  • the pressure control valve 32 comprises a cyliner 27 in which a piston 28 is arranged to be slidably displaced against the force of a spring 30.
  • a pressure chamber 29 is defined by the piston 28 and one end of the cylinder 27.
  • the pressure chamber 29 is connected with the bypass line 25a through the connecting line 31.
  • a radial bore 28a is provided in the piston 28 for connecting the feed side of the fuel pump 17 through the connecting line 22a to the connecting line 22b and thus to the return line portion 2512.
  • the radial bore 28a in the piston 28 there could also be, of course, provided an annular slot.
  • the return line portions 25a and 25b are connected together through a throttle 33.
  • the fuel which is present in the fuel reservoir '18, is fed through the first fuel pump 17 and then through the second fuel pump 23 under a pressure corresponding to the rpm of the internal combustion engine E.
  • the fuel fed through the second fuel pump 23 enters the pump working chamber 10 through the fuel suction channel 9 and from there it is fed under pressure through the injection nozzles 12 and ultimately to the internal combustion engine E by displacing the piston 5 to the right (in the drawing).
  • the fuel injection ends. But since the location of the revolving slide ring 7 depends on the location of the acceleration lever of the internal combustion engine E and is displaceable by means of the lever 26, the above mentioned termination of the fuel injection can be regulated, in dependence on the load of the internal combustion engine E. In similar manner the fuel quantity flowing through the transverse bore 5b is a measure of the load of the internal combustion engine E.
  • the fuel fed from the fuel reservoir 18 through the first fuel pump 17 passes through the pressure line 20 and enters the pressure chamber 21; and can flow also through the pressure line 20, the connection line 22a, the bore 28a, the connection line 22b, and the bypass line 25b back into the fuel reservoir 18.
  • the feed pressure in the chamber 21 acts on the piston 16 and displaces it to the right.
  • the roller ring 4 turns about the axis of the drive shaft 2 by means of the lever 13.
  • the cycle of the reciprocating movement of the piston 5 is altered.
  • the injection moment of the fuel injection is also changed in the internal combustion engine E.
  • the fuel feed pressure of the first fuel pump 17 and the second fuel pump 23 is also changed in dependence on the rpm of the internal combustion engine E, and the above mentioned injection moment is changed therefore also in dependence on the rpm of the internal combustion engine E.
  • a pressure regulating valve 32 in which valve the pressure chamber 29 is connected with the bypass chamber 24 by the connecting line 31 and the return line 25a.
  • a swivel joint 44 is further mounted on the housing to connect the bypass chamber 24 and return line 25a.
  • a bushing 45 is inserted into a fuel passage 46.
  • a bolt 48 having a first passage 48a in an axial direction and a second passage 48b in a radial direction is also secured to the bushing 45 with a swivel nipple 47 which has an annular groove 47b communicating the second passage 48b.
  • the fuel injection moment can be controlled not only in dependence on the rpm of the internal combustion engine E but also in dependence on the load of the internal combustion engine E. This is so because the fuel pressure regulating the pressure regulating valve 32 depends on the position of the revolving slide ring 7 or the load of the internal combustion engine E.
  • the fuel injection moment can be regulated not only in dependence on the rpm but also on the load of the internal combustion engine E, the present invention has a substantial advantage in that in this manner it is possible to inject the fuel into the internal combustion engine E at any given time and at that injection moment which is the most favorable for that operational condition of the internal combustion engine E.
  • a fuel injection pump for internal combustion engines including:
  • said relief channel being operatively associated with said working chamber
  • cam drive means for driving said pump piston
  • fuel feed pump means synchronously driven with said pump piston for feeding fuel through said relief channel to said working chamber in dependence on engine rpm;
  • i. means defining a bypass chamber
  • j. means controlling the extent to which fuel flows through said relief channel to said bypass chamber, wherein a portion of the fuel feed quantity of the fuel injection quantity is caused to flow off through said relief channel to said bypass chamber in order to alter the fuel injection quantity by regulating said relief channel and by displacing said cam drive means by said control piston under the improvement comprising:
  • said means connecting said pressure regulating valve means to said fuel feed pump means includes a connecting line
  • said pressure control valve comprises a cylinder, a spring, a piston displaceable by the regulating pressure within said cylinder against the force of said spring, said piston including a bore for controlling said connecting line leading from the feed pressure side of said feed pump means through said control valve cyiinder to said fuel reservoir.
  • said controlling means comprises a revolving slide ring and a fuel quantity altering lever, wherein said relief channel passes through said pump piston and includes a transverse bore portion with said transverse bore being controllable by means of said revolving slide ring, and wherein said ring is adjustable by means of said fuel quantity altering lever.

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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)
US415411A 1972-11-14 1973-11-13 Fuel injection pump for internal combustion engines Expired - Lifetime US3910724A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47114575A JPS4971319A (zh) 1972-11-14 1972-11-14

Publications (1)

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US3910724A true US3910724A (en) 1975-10-07

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ID=14641257

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Application Number Title Priority Date Filing Date
US415411A Expired - Lifetime US3910724A (en) 1972-11-14 1973-11-13 Fuel injection pump for internal combustion engines

Country Status (5)

Country Link
US (1) US3910724A (zh)
JP (1) JPS4971319A (zh)
AT (1) AT330511B (zh)
DE (1) DE2355347A1 (zh)
FR (1) FR2206449B1 (zh)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968779A (en) * 1975-02-11 1976-07-13 Stanadyne, Inc. Fuel injection pump and injection control system therefor
US4118156A (en) * 1976-12-01 1978-10-03 Sulzer Brothers Limited Fuel injection pump having choke means in overflow line
US4168690A (en) * 1976-10-02 1979-09-25 Robert Bosch Gmbh Fuel injection system having timing piston responsive to load dependent pressure signal
US4168940A (en) * 1976-10-28 1979-09-25 Robert Bosch Gmbh Fuel injection pump
US4200075A (en) * 1977-03-22 1980-04-29 Diesel Kiki Company, Ltd. Fuel injection apparatus
US4220128A (en) * 1977-06-30 1980-09-02 Diesel Kiki Co., Ltd. Distribution type fuel injection pump
US4229148A (en) * 1978-12-22 1980-10-21 Ambac Industries, Incorporated Fuel injection pump
US4332227A (en) * 1978-06-19 1982-06-01 Robert Bosch Gmbh Injection timing device for internal combustion engines
US4366795A (en) * 1979-08-07 1983-01-04 Robert Bosch Gmbh Fuel injection pump for internal combustion engine
US4397285A (en) * 1981-07-15 1983-08-09 Physics International Company Closed loop diesel engine control
US4461259A (en) * 1980-12-29 1984-07-24 Spica S.P.A. Distributor type injection pump for feeding fuel to an internal combustion engine
DE4401074A1 (de) * 1994-01-15 1995-07-20 Elasis Sistema Ricerca Fiat Pumpenanordnung, insbesondere zur Förderung von Kraftstoff aus einem Vorratsbehälter zu einer Brennkraftmaschine
US20130333672A1 (en) * 2012-06-14 2013-12-19 Hyundai Motor Company Fuel supply apparatus for gdi engine having reduced pressure pulsation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1579334A (en) * 1976-06-22 1980-11-19 Lucas Industries Ltd Fuel injection pumping apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2679804A (en) * 1953-02-11 1954-06-01 American Bosch Corp Fuel injection pump
US2765741A (en) * 1953-01-19 1956-10-09 Bosch Arma Corp Fuel injection pump
US2810376A (en) * 1954-07-29 1957-10-22 Bosch Gmbh Robert Injection pump
US3358662A (en) * 1965-01-05 1967-12-19 Bosch Gmbh Robert Reciprocating fuel injection pumps including means for varying the advance of injection
US3630643A (en) * 1969-02-28 1971-12-28 Bosch Gmbh Robert Fuel injection pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765741A (en) * 1953-01-19 1956-10-09 Bosch Arma Corp Fuel injection pump
US2679804A (en) * 1953-02-11 1954-06-01 American Bosch Corp Fuel injection pump
US2810376A (en) * 1954-07-29 1957-10-22 Bosch Gmbh Robert Injection pump
US3358662A (en) * 1965-01-05 1967-12-19 Bosch Gmbh Robert Reciprocating fuel injection pumps including means for varying the advance of injection
US3630643A (en) * 1969-02-28 1971-12-28 Bosch Gmbh Robert Fuel injection pump

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968779A (en) * 1975-02-11 1976-07-13 Stanadyne, Inc. Fuel injection pump and injection control system therefor
US4168690A (en) * 1976-10-02 1979-09-25 Robert Bosch Gmbh Fuel injection system having timing piston responsive to load dependent pressure signal
US4168940A (en) * 1976-10-28 1979-09-25 Robert Bosch Gmbh Fuel injection pump
US4118156A (en) * 1976-12-01 1978-10-03 Sulzer Brothers Limited Fuel injection pump having choke means in overflow line
US4200075A (en) * 1977-03-22 1980-04-29 Diesel Kiki Company, Ltd. Fuel injection apparatus
US4220128A (en) * 1977-06-30 1980-09-02 Diesel Kiki Co., Ltd. Distribution type fuel injection pump
US4332227A (en) * 1978-06-19 1982-06-01 Robert Bosch Gmbh Injection timing device for internal combustion engines
US4229148A (en) * 1978-12-22 1980-10-21 Ambac Industries, Incorporated Fuel injection pump
US4366795A (en) * 1979-08-07 1983-01-04 Robert Bosch Gmbh Fuel injection pump for internal combustion engine
US4461259A (en) * 1980-12-29 1984-07-24 Spica S.P.A. Distributor type injection pump for feeding fuel to an internal combustion engine
US4397285A (en) * 1981-07-15 1983-08-09 Physics International Company Closed loop diesel engine control
DE4401074A1 (de) * 1994-01-15 1995-07-20 Elasis Sistema Ricerca Fiat Pumpenanordnung, insbesondere zur Förderung von Kraftstoff aus einem Vorratsbehälter zu einer Brennkraftmaschine
US5571243A (en) * 1994-01-15 1996-11-05 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile Per Azioni Pump device for supplying fuel from a tank to an internal combustion engine
DE4401074B4 (de) * 1994-01-15 2007-01-18 Robert Bosch Gmbh Pumpenanordnung, insbesondere zur Förderung von Kraftstoff aus einem Vorratsbehälter zu einer Brennkraftmaschine
US20130333672A1 (en) * 2012-06-14 2013-12-19 Hyundai Motor Company Fuel supply apparatus for gdi engine having reduced pressure pulsation
US9376995B2 (en) * 2012-06-14 2016-06-28 Hyundai Motor Company Fuel supply apparatus for GDI engine having reduced pressure pulsation

Also Published As

Publication number Publication date
ATA950173A (de) 1975-09-15
FR2206449A1 (zh) 1974-06-07
FR2206449B1 (zh) 1977-08-19
DE2355347A1 (de) 1974-05-30
AT330511B (de) 1976-07-12
JPS4971319A (zh) 1974-07-10

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