US3510062A - Delivery valve for engine fuel pump - Google Patents

Delivery valve for engine fuel pump Download PDF

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Publication number
US3510062A
US3510062A US690807A US3510062DA US3510062A US 3510062 A US3510062 A US 3510062A US 690807 A US690807 A US 690807A US 3510062D A US3510062D A US 3510062DA US 3510062 A US3510062 A US 3510062A
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US
United States
Prior art keywords
fuel
valve
chamber
injector
delivery valve
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
US690807A
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English (en)
Inventor
Donald J Waldman
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Application granted granted Critical
Publication of US3510062A publication Critical patent/US3510062A/en
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
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

  • a fuel pump of the type within which the present invention is described is disclosed in greater detail in my assignees Pat. No. 2,696,786 of K. J. Fleck et al., entitled Fuel Injection Pump Plunger.
  • the fuel injector shown in the referenced copending patent application is of the inwardly opening type known for the characteristic of trapping fluid in its housing under certain operating conditions. Similar valves of different construction have been provided with bleed-off lines leading to a common line and to the atmosphere to reduce excessive residual pressures in the fuel injector. The use of such bleed-off line results in a bulky valve which is of complex and expensive construction as Well as being otherwise undesirable.
  • FIG. 1 is a sectional view of a fuel pump and fuel injector for an internal combustion engine
  • FIG. 2 is an enlarged perspective illustration of a delivery valve within the fuel pump of FIG. 1.
  • a fuel pump 11 for delivering fuel under pressure to a fuel injector 12 by means of an interconnecting line 13.
  • the illustrated fuel injector 12 is of a type described in detail in the copending patent application first referenced above. Intermittent flow of fuel under pressure from the fuel pump through the line 13 of the fuel injector passes through a series of grooves 14 formed between the injector case 16 and a sleeve 17 disposed therein which prevent passage of foreign materials. The fuel then passes into a valve chamber 18 which is in communication with a passage 19 and injection orifices 21., according to positioning of a check valve 22.
  • the check valve 22 has a valve head 23 with a spherically shaped end which is urged into closing relation with a seating surface 24 by a spring 25 to block the passage 19.
  • An enlarged cylindrical portion 26 at the upper end of the check valve slides within a collar 27 mounted at the lower end of sleeve 17.
  • the sleeve 17 internally defines a fuel accumu- "'ice lator chamber 28. Leakage of fuel between the collar 27 and cylindrical valve portion 26 tends to equalize fuel pressure between the valve chamber 18 and the accumulator chamber 28. As fuel under pressure enters the valve chamber 18, it acts on the undersurfaces of the valve head 23 urging the check valve upwardly and communicating the fuel to the passage 19 and the orifices 21.
  • the fuel pump 11 is preferably of a type described in detail in the patent referenced above although the invention is equally adaptable to other types of fuel pumps having a delivery valve similar to that described below.
  • Fuel is delivered to a manifold 31 of the pump 11 by another low pressure pump (not shown).
  • Fuel from the manifold 31 is communicated to a plunger bore 32 by a radial passage 33.
  • a plunger 34 is disposed in the bore 32 for reciprocal pumping motion according to interaction of a spring 36 and a cam 37 upon a follower 38 which is connected to the plunger 34.
  • the plunger 34 is of a type providing a variable pumping stroke in response to rotation of the plunger 34 by a rack bar 39 which engages gear teeth 41 on a quadrant fixed to the follower.
  • a delivery valve 42 is urged downwardly against a seating surface 44 by a spring 43. With the delivery valve in this closed position, it cooperates with the plunger bore 32 and the plunger 34 to form a variable pumping chamber 46.
  • the pumping chamber 46 has a maximum volume and is in communication with the fuel in manifold 31 by the passage 33. In this position, low pressure fuel from the manifold 31 enters the pumping chamber 46.
  • the plunger 34 is then urged upwardly against the force of the spring 36 by rotation of the cam 37 so that it closes off the passage 33.
  • the accumulator chamber 28 causes residual pressures to appear in the valve chamber 18 of the injector 12 during those portions of the pumping cycle of the fuel pump 11 when the delivery valve 42 is closed by its spring 43.
  • the numerous injections or pumping cycles cause the delivery valve 42 to fluctuate between its open and closed positions in a floating manner so that residual pressures in the line 13 and the injector 12 are low enough to permit proper operation of the injector 12.
  • the delivery valve 42 moves only a short distance from its seat 44 and rapidly returns into closed relation therewith.
  • the present invention provides a modified delivery value which is best seen in FIG. 2.
  • the delivery valve 42 has a face surface 51 which closes with the seating surface 44 (FIG. 1) when the delivery valve is positioned by the spring 43.
  • a limited passage is formed across the delivery valve assembly to relieve residual pressures in the spool injector when the delivery valve is closed.
  • the limited passage is preferably formed, as at 52, between the face surface 51 of the delivery valve and the seating surface 44 when they are in abutting relation.
  • the present embodiment the
  • the limited passage 52 is formed by a channel in the face surface 51 of the delivery valve.
  • the channel is sufiiciently small so that, during the pumping stroke of the plunger 34, it does not interfere with the proper pressure development in the pumping chamber 46 nor does it interfere with the manner in which the delivery valve opens to pass that fuel under pressure from the pumping chamber 46 to the fuel injector by means of the line 13.
  • the channel 52 in the closed delivery valve provides suflicient relief for pressure in the injector valve by permitting it to flow back into the pumping chamber 4 46 of the fuel pump 11.
  • a fuel pump in combination with a fuel injector of the inwardly opening type and including a fuel accumulator chamber, the fuel pump being effective for providing fuel under pressure from a fuel source to the fuel injector and comprising a delivery valve assembly comprising a valve and valve seat in the fuel pump having face surfaces normally in abutting relation which open to permit flow of fuel under pressure to the fuel injector, the facing surfaces of the valve and valve seat defining a limited passage when in abutting relation, the passage permitting limited reverse flow of fuel from the injector and reducing residual pressure in the fuel injector.
  • valve is normally urged against the valve seat by a spring, the valve being intermittently urged into open relation with the valve seat by pressure developed in the pump, said limited passage being a small channel formed in said valve face.

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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)
US690807A 1967-12-15 1967-12-15 Delivery valve for engine fuel pump Expired - Lifetime US3510062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US69080767A 1967-12-15 1967-12-15

Publications (1)

Publication Number Publication Date
US3510062A true US3510062A (en) 1970-05-05

Family

ID=24774044

Family Applications (1)

Application Number Title Priority Date Filing Date
US690807A Expired - Lifetime US3510062A (en) 1967-12-15 1967-12-15 Delivery valve for engine fuel pump

Country Status (4)

Country Link
US (1) US3510062A (enrdf_load_stackoverflow)
DE (1) DE2010242A1 (enrdf_load_stackoverflow)
FR (1) FR2083704A5 (enrdf_load_stackoverflow)
GB (1) GB1297033A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788546A (en) * 1972-06-26 1974-01-29 Caterpillar Tractor Co Fuel injection system
US3794248A (en) * 1973-04-23 1974-02-26 Lockwood Corp Valve construction for irrigation systems
DE4037465A1 (de) * 1990-10-31 1992-05-07 Daimler Benz Ag Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
EP0611094A1 (en) * 1993-02-10 1994-08-17 Lucas Industries Public Limited Company Valve
US6149073A (en) * 1994-05-18 2000-11-21 Cummins Engine Company, Inc. Ceramic plunger for internal combustion engine high pressure fuel system
US20030116660A1 (en) * 2001-12-20 2003-06-26 Caterpillar, Inc. Nozzle insert for dual mode fuel injector

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS188353B1 (en) * 1975-02-14 1979-03-30 Jaromir Indra Displacement valve for the injection pump of the combustion engines
DE3141654A1 (de) * 1981-10-21 1983-05-05 L'Orange GmbH, 7000 Stuttgart Kraftstoffeinspritzpumpe, insbesondere fuer eine dieselbrennkraftmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696786A (en) * 1952-01-21 1954-12-14 Caterpillar Tractor Co Fuel injection pump plunger
US2729169A (en) * 1951-06-19 1956-01-03 Alco Products Inc Fuel pumping system
US2788246A (en) * 1956-06-27 1957-04-09 Alco Products Inc Fuel injectors
US2797644A (en) * 1953-06-29 1957-07-02 Bosch Arma Corp Fuel injection pump
US2843045A (en) * 1956-05-03 1958-07-15 William H Mashinter Metering pump apparatus
US2888876A (en) * 1958-01-17 1959-06-02 Alco Products Inc Fuel injection equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2729169A (en) * 1951-06-19 1956-01-03 Alco Products Inc Fuel pumping system
US2696786A (en) * 1952-01-21 1954-12-14 Caterpillar Tractor Co Fuel injection pump plunger
US2797644A (en) * 1953-06-29 1957-07-02 Bosch Arma Corp Fuel injection pump
US2843045A (en) * 1956-05-03 1958-07-15 William H Mashinter Metering pump apparatus
US2788246A (en) * 1956-06-27 1957-04-09 Alco Products Inc Fuel injectors
US2888876A (en) * 1958-01-17 1959-06-02 Alco Products Inc Fuel injection equipment

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788546A (en) * 1972-06-26 1974-01-29 Caterpillar Tractor Co Fuel injection system
US3794248A (en) * 1973-04-23 1974-02-26 Lockwood Corp Valve construction for irrigation systems
DE4037465A1 (de) * 1990-10-31 1992-05-07 Daimler Benz Ag Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
EP0611094A1 (en) * 1993-02-10 1994-08-17 Lucas Industries Public Limited Company Valve
US5390692A (en) * 1993-02-10 1995-02-21 Lucas Industries Valve
US6149073A (en) * 1994-05-18 2000-11-21 Cummins Engine Company, Inc. Ceramic plunger for internal combustion engine high pressure fuel system
US20030116660A1 (en) * 2001-12-20 2003-06-26 Caterpillar, Inc. Nozzle insert for dual mode fuel injector
US6886762B2 (en) * 2001-12-20 2005-05-03 Caterpillar Inc. Nozzle insert for dual mode fuel injector

Also Published As

Publication number Publication date
FR2083704A5 (enrdf_load_stackoverflow) 1971-12-17
DE2010242A1 (de) 1971-09-23
GB1297033A (enrdf_load_stackoverflow) 1972-11-22

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Legal Events

Date Code Title Description
DC Disclaimer filed

Effective date: 19831201

AS Assignment

Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515

Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515