US3456884A - Liquid fuel supply systems - Google Patents

Liquid fuel supply systems Download PDF

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Publication number
US3456884A
US3456884A US728850A US72885068A US3456884A US 3456884 A US3456884 A US 3456884A US 728850 A US728850 A US 728850A US 72885068 A US72885068 A US 72885068A US 3456884 A US3456884 A US 3456884A
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United States
Prior art keywords
fuel
nozzle
valve member
valve
passage
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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
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US728850A
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English (en)
Inventor
Basil Edward Knight
David Shufflebotham
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CAV Ltd
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CAV Ltd
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Filing date
Publication date
Application filed by CAV Ltd filed Critical CAV Ltd
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Publication of US3456884A publication Critical patent/US3456884A/en
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    • 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
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load

Definitions

  • a liquid fuel supply system for internal combustion engines in which it is desirable to inject a predetermined quantity -of fuel through the injection nozzle at a restricted flow rate before injecting the main quantity of fuel through the nozzle at an unrestricted flow rate.
  • a device comprising in combination a valve member slideable in a cylinder, one end of said cylinder being in communication with a fuel pump and the other end of the cylinder being in communication with the nozzle through a restricted passage.
  • Resilient means urge the valve member towards said one end of the cylinder, and a by-pass passage is arranged to be opened by the valve member when it has been moved a predetermined extent against the action of the resilient means.
  • the movement of the valve member towards the said other end of the cylinder displaces a predetermined quantity ⁇ of fuel to the nozzle through the restricted passage at a restricted ow rate.
  • the by-pass passage serves to by-pass the restricted passage so as to allow the main quantity of fuel to be injected through the nozzle at an unrestricted rate.
  • This invention relates to liquid fuel supply systems for internal combustion engines and of the kind including an injection nozzle which is mounted in the body of the engine and through which fuel can be delivered to a combustion space of the engine and a fuel pump for supplying fuel to the nozzle in timed relationship to the engine, said nozzle incorporating a pressure -responsive valve for controlling the flow of fuel therethrough.
  • the object of this invention is to provide such a fuel system in an improved form.
  • a fuel system of the kind specified includes in association with or adjacent to the s nozzle a device comprising in combination a valve member slidable in a cylinder, one end of said cylinder being in communication with the fuel pump and the other end of said cylinder being in communication with the nozzle through a restriction, resilient means urging the valve member towards said one end of the cylinder, and a bypass passage arranged to be opened by the valve member when the latter has been moved a predetermined extent against the action of the resilient means, the movement of the member towards said other end of the cylinder serving to displace a predetermined quantity of fuel to the nozzle at a restricted rate, said by-pass passage serving, when opened, to place said one end of the cylinder in communication with a point between said nozzle and said restriction.
  • the device includes a non-return valve which can be opened to permit fuel to flow from the nozzle to the pump, said non-return valve serving to permit the seating of the pressure responsive valve in the nozzle and also serving to maintain a predetermined residual pressure in the nozzle.
  • FIGURE 1 is a view of one example of a fuel supply system in accordance with the invention and FIGURE 2 is a modification of the system shown in FIGURE 1.
  • an injection nozzle having a body 10 of generally cylindrical form and adapted for mounting in the cylinder head 11 of the engine so that a nozzle head 12 mounted on the body 10 forms part of the wall of a combustion space of the engine.
  • the nozzle head is provided with an orifice 13 through which fuel can be directed into the combustion space and in the nozzle head is a spring loaded control valve 14 which is actuated by the pressure of fuel supplied to the injection nozzle by way of a pipe line 16 from a fuel pump 15 of any convenient form such, for example, as a pump of the rotary distributor type.
  • the device comprises a body which is formed of two parts 17, 18 which are in screw thread engagement with each other.
  • a cylindrical bore 19 which, at its end adjacent the nozzle is in communication with passages in the nozzle body through which fuel passes to the control valve 14 and orifice.
  • the other end of the bore 19 opens into a chamber formed in the part 17 and slidably mounted in the bore is a valve element 20 a portion of which including a head 20a is accommodated in the chamber.
  • the chamber is connected to the fuel pump by way of the pipeline 16 and the valve element 20 is loaded by a first coiled spring 21 in a direction towards the nozzle.
  • the head 20a and the adjacent end of the part 18 co-operate under the action of the spring 21 to form a seal so as to interrupt communication between the chamber and the bore.
  • a cylinder which is defined by a bore 22 and which at its end disposed within the part 18 is closed by a plug 23 in which is formed a restricted passage 24.
  • a cylindrical valve member 26 which is loaded by a spring 26a in a direction towards the part 17 of the body, the movement of the mem-ber being limited by a stop plate 27 which is retained bythe spring 21.
  • a Iradially disposed passage 28 which is closed by the valve member 26 when the latter is against the stop plate 27, and the passage 28 communicates with a circumferential groove formed on the external periphery of the Valve element. This groove communicates with the end ⁇ of the bore 19 adjacent the nozzle by way of longitudinal grooves 29 formed in the periphery of the valve element and the circumferential groove and the passage 28 and longitudinal grooves 29 constitute a by-pass passage.
  • the action of the device is as follows, when fuel is delivered by the fuel pump the valve member 26 is first moved, by the initial quantity of fuel delivered by the pump, against the action of the spring 26a and during this movement fuel is displaced from the bore 22 and flows via the restricted passage 24 to the nozzle and causes the control valve 14 to be opened slightly to allow a predetermined quantity of fuel to be injected. After this predetermined quantity of fuel has been delivered the radial passage 28 is uncovered by the valve member 26 and fuel passes directly t-o the nozzle. Fuel continues to liow until the required quantity, as determined by the pump, is delivered and then the control valve 14 closes due to the lowered fuel pressure, and the valve member 26 moves to close the radial passage.
  • valve element 20 and its head 20a will be moved against the action of the spring 21 and will act as a pressure relieving valve to permit the control valve to close quickly and also to maintain a predetermined residual pressure in the nozzle. In this sense, valve element 20, 20a acts as a non-return valve.
  • valve member 26 is provided with an axial blind bore 30 which extends from the end of the valve member adjacent the spring 26a. Moreover, the blind end of the bore is in communication with the chamber through an orifice 31 which in the particular example has an effective size slightly larger than that of the restriction 24. Furthermore formed in the periphery of the valve member is a circumferential groove 32 which is in communication with the blind bore by way of transverse passages 33 formed in the wall of the valve member. The groove is arranged to be opened to a further port 34 in the wall of the bore 22, which port is in communication with the by-pass passage, before the .by-pass passage has been opened to the chamber by movement of the valve member 26 against the action of the spring 26a.
  • the arrangement is such that towards the end of the movement of the valve member 26 the portion of the bore 22 which contains the spring 26a is progressively opened to the by-pass passage through the blind bore 30, the circumferential groove 32 and the further port 34 with which the edge of the groove 32 co-acts.
  • the hydraulic resistance to the motion of the valve member towards the other end of the cylinder is progressively lowered just before the by-pass passage is opened.
  • the return motion of the valve member under the inuence of the spring 26a is not hindered since fuel can iiow between the opposite ends of the bore 22 through the passage in the valve member.
  • a liquid fuel supply system for internal combustion engines comprising an injection nozzle to which fuel is supplied in timed relationship to the engine by a fuel pump, a pressure responsivel valve in the nozzle for controlling the flow of fuel therethrough, a cylindrical bore dened in the nozzle or in a part which can be secured thereto, one end of said cylindrical bore being in communication with the fuel pump and the other end thereof being in communication with a conduit within the nozzle controlled by the pressure responsive valve, a valve element slidable in said cylindrical bore, a longitudinal groove defined in the valve element and serving to establish communication between said one end and said other end of the bore, a head formed on the end of the valve element at said one end of the bore, said head cooperating when the element has moved its fullest extent under the action 'of a resilient means, with a step for-med in the cylindrical bore, a cylinder formed in said valve element, one end of the cylinder being in communication with said fuel pump and the other end thereof being in communication with said conduit, a plug serving to close said other end l
  • a ⁇ fuel supply system as claimed in claim 1 including a passage formed in the valve member and through which fuel can ow to facilitate the return motion of the valve member under the action of its resilient means.
  • a fuel supply system as claimed in claim 2 in which said passage in the valve member is in communication with a groove formed in the periphery of the valve member, said groove being arranged to be opened by a progressively increasing amount as the valve member moves to a further port lformed in the wall of the valve element, the further port communicating with said groove in the valve element.

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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)
US728850A 1965-01-11 1968-05-13 Liquid fuel supply systems Expired - Lifetime US3456884A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1133/65A GB1060181A (en) 1965-01-11 1965-01-11 Liquid fuel supply systems for internal combustion engines
GB3194465 1965-07-27

Publications (1)

Publication Number Publication Date
US3456884A true US3456884A (en) 1969-07-22

Family

ID=26236514

Family Applications (1)

Application Number Title Priority Date Filing Date
US728850A Expired - Lifetime US3456884A (en) 1965-01-11 1968-05-13 Liquid fuel supply systems

Country Status (5)

Country Link
US (1) US3456884A (enrdf_load_stackoverflow)
DE (1) DE1526637B2 (enrdf_load_stackoverflow)
ES (1) ES321886A1 (enrdf_load_stackoverflow)
FR (1) FR1463387A (enrdf_load_stackoverflow)
GB (1) GB1060181A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5505384A (en) * 1994-06-28 1996-04-09 Caterpillar Inc. Rate shaping control valve for fuel injection nozzle
DE19612721A1 (de) * 1995-03-30 1996-10-02 Avl Verbrennungskraft Messtech Speichereinspritzsystem mit Voreinspritzung für eine Brennkraftmaschine
US6360727B1 (en) 2000-03-14 2002-03-26 Alfred J. Buescher Reduce initial feed rate injector with fuel storage chamber

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2911447A1 (de) * 1979-03-23 1980-09-25 Daimler Benz Ag Den kraftstoffdurchfluss steuerndes steuerglied fuer einspritzvorrichtungen bei insbesondere luftverdichtenden brennkraftmaschinen
JPS5725157U (enrdf_load_stackoverflow) * 1980-07-18 1982-02-09
DE19602906A1 (de) * 1996-01-27 1997-07-31 Bosch Gmbh Robert Druckventil
DE19834763C2 (de) * 1998-08-01 2003-01-23 Bosch Gmbh Robert Pumpe-Leitung-Düse-System
CN111636987A (zh) * 2020-06-03 2020-09-08 一汽解放汽车有限公司 一种限压阀

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE913717C (de) * 1952-09-27 1954-06-18 Kloeckner Humboldt Deutz Ag Einspritzvorrichtung an Dieselmaschinen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE913717C (de) * 1952-09-27 1954-06-18 Kloeckner Humboldt Deutz Ag Einspritzvorrichtung an Dieselmaschinen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5505384A (en) * 1994-06-28 1996-04-09 Caterpillar Inc. Rate shaping control valve for fuel injection nozzle
DE19612721A1 (de) * 1995-03-30 1996-10-02 Avl Verbrennungskraft Messtech Speichereinspritzsystem mit Voreinspritzung für eine Brennkraftmaschine
DE19612721C2 (de) * 1995-03-30 2000-11-02 Avl Verbrennungskraft Messtech Speichereinspritzsystem mit Voreinspritzung für eine Brennkraftmaschine
US6360727B1 (en) 2000-03-14 2002-03-26 Alfred J. Buescher Reduce initial feed rate injector with fuel storage chamber

Also Published As

Publication number Publication date
FR1463387A (fr) 1966-12-23
ES321886A1 (es) 1966-10-16
DE1526637A1 (de) 1970-01-22
DE1526637B2 (de) 1976-02-12
GB1060181A (en) 1967-03-01

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