US3924975A - Fuel pump - Google Patents

Fuel pump Download PDF

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Publication number
US3924975A
US3924975A US416832A US41683273A US3924975A US 3924975 A US3924975 A US 3924975A US 416832 A US416832 A US 416832A US 41683273 A US41683273 A US 41683273A US 3924975 A US3924975 A US 3924975A
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US
United States
Prior art keywords
chamber
diaphragm
fuel
chambers
connection
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
US416832A
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English (en)
Inventor
James M Hundertmark
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.)
Brunswick Corp
Original Assignee
Brunswick Corp
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 Brunswick Corp filed Critical Brunswick Corp
Priority to US416832A priority Critical patent/US3924975A/en
Priority to CA210,224A priority patent/CA997209A/en
Priority to GB4266174A priority patent/GB1456924A/en
Priority to AU74016/74A priority patent/AU479363B2/en
Priority to FR7434092A priority patent/FR2251719B1/fr
Priority to DE2449522A priority patent/DE2449522C3/de
Priority to SE7414450A priority patent/SE399943B/sv
Priority to JP13262274A priority patent/JPS5319730B2/ja
Publication of USB416832I5 publication Critical patent/USB416832I5/en
Application granted granted Critical
Publication of US3924975A publication Critical patent/US3924975A/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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/12—Feeding by means of driven pumps fluid-driven, e.g. by compressed combustion-air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive

Definitions

  • Another object is to provide such a pump which will avoid the above-noted problem under conditions of a highperformance demand.
  • a specific object is to achieve the above objects with a construction providing increased output for a given diaphragm area in the primary pumping chamber.
  • a general object is to provide such a pump at little or no additional cost or complexity, and lending itself to essentially the same ready inspection and servicing that characterize present constructions.
  • FIG. 1 is a simplified vertical sectional view through a fuel pump of the invention, with a schematic showing of operating connections;
  • FIG. 2 is a bottom view of the body-casting assembly of the pump of FIG. 1;
  • FIG. 3 is a plan view of enregistered diaphragm and gasket parts of the pump of FIG. 1;
  • FIG. 4 is a plan view of the head casting used in the pump of FIG. 1;
  • FIG. 5 is a simplified graphical plot to illustrate improved performance achieved by use of the invention.
  • the invention is shown in application to a fuel pump for a multiple-cylinder two cycle engine 10, using inlet fuel drawn in line 11 from a fuel tank and delivering fuel under pressure into line 12 to the engine carburetor.
  • the pump comprises a body casting having three chambers 14-15-16 each of which is closed along its lower side by diaphragm means which is preferably a single piece of flexible material such as Neoprene sheet but which for purposes of better identification is marked with separate numbers 17-18-19, since it serves a separate diaphragm function for operation at each of the respective chambers 14-15-16.
  • the chambers 14-15-16 will be sometimes referred to as diaphragmoperated chambers.
  • the diaphragm means is clamped between the body casting 13 and a head casting 20, with suitable upper and lower gaskets 21-22 to assure a diaphragm seal to each of the chambers 14-15-16 and to the respective fluid-pressure operating cavities 23-24-25 in head beneath chambers 14-15-16.
  • cavities 23-25 are interconnected by passage means 26 communicating with a single control port 27 and that cavity 24 has its own independent control port 28; the interconnection 26 is only schematically shown in FIG. 1, but the respective control ports 27-23 will be understood to be connected as by flexible conduits 29-30 to separate crankcase chambers of engine 10.
  • Connections 29-30 are identified by legends Phase A and Phase B, respectively, to denote the phase-displaced nature of fluid-pressure pulsations derived from the two crankcase-chamber connections to engine 11
  • Inlet and outlet check-valve subassernblies 31-32 are removably secured by clamp means 33 to the upper wall of the main or pumping diaphragm-operated chamber 15, the unidirectional flow function of these valves being shown by heavy arrows in FIG. 1.
  • Outlet valve 32 discharges into an upper chamber 34 having an inside-ported connection 35 to the diaphragmoperated chamber 16, from which an outlet fitting 36 furnishes a flow of fuel under pressure to the carburetor-supply or outlet-fuel line 12.
  • a cap 37 On the inlet side of the pump, a cap 37 is removably secured (by means 38) over ports 39-4@ to the respective diaphragm operated chambers 14-15, thus defining a connecting chamber within which fuel-strainer means 41 may function.
  • strainer means 41 is a frusto-conical wire-mesh basket clamped and peripherally sealed by an O-ring gasket 42 and by the skirt of cap 37; a supply formation 43 integral with cap 37 enables servicing of means 41 without detachment of the conduit connection 11, as will be understood.
  • valve 31 In the upward-movement part of the cycle of inlet diaphragm 17, the pumping diaphragm 18 is in its downward-movement phase, and, since the effective area of diaphragm 17 is less than that of diaphragm 18, valve 31 not only opens promptly but the chamber of cap 37 is still subjected to a net negative pressure (partial vacuum), so that fuel continues to be drawn into line 11. Fuel is not forced back down the fuel line because any tendency of pressure rise in chamber 14 is well dissipated by the vacuum induced in the pumping chamber 15. Thus, as long as shaft 10 rotates, a vacuum is induced in line 11, even during the half cycles in which valve 31 is closed.
  • the inlet diaphragm 17 thus provides for more effective lift of the fuel, before and after it reaches the chamber of cap 37, and for increased seating efficacy of valve 31 once the fuel has reached the pump.
  • the improved seating of valve 31 develops increased delivery pressure and flow rate delivered by a given size pump.
  • At least part of the enhanced capacity of the pump can be attributed to the pumping action at inlet diaphragm 17, in that whatever diaphragm 17 pumps is naturally accepted by the main diaphragm-operated chamber 15.
  • FIG. 5 is provided as an illustration of the magnitude of improvement realized by the invention, for diaphragm-area proportions substantially as shown in the drawing, i.e., wherein the effective area of each of the inlet and outlet diaphragms 17-19 is approximately one half that of the main diaphragm 18.
  • the preferred area relationship has not yet been determined, but certainly it can be said that the effective area of the inlet diaphragm 17 is preferably less than that of the main diaphragm 18, in order that the fuelvolume pumped at 17 can be assuredly drawn into chamber during the same part of the cycle.
  • FIG. 5 depicts fuel flow and delivery pressure observed for a pump of the invention (designated as a three-chamber pump), in comparison with fuel flow and delivery pressure achieved by parallel use of two conventional two-chamber pumps.
  • Each of the twochamber pumps was as herein acknowledged and described as present commercial devices, each having a pumping diaphragm area to match that of the single three-chamber pump of the invention, and the area of each of the outlet diaphragms was the same, being substantially one half that of the pumping diaphragm. As seen from FIG.
  • the three-chamber pump of the invention delivered at almost the combined flow rate of the two parallel two-chamber pumps, for the slowerspeed range (1500 to 3200 r.p.m.); but for higher speeds, the single inventive pump far outperformed the combined capabilities of the two conventional pumps.
  • delivered pressure from the three-chamber pump of the invention is at all times slightly better than that from the two conventional pumps in parallel.
  • the described pump of the invention will be seen to have met all stated objects of the invention.
  • the principle of operation has been found to apply for excitationphase displacements other than 180, as for example the 120 displacement between instantaneous pressures in certain crankcases of a six-cylinder engine, or in the case of a four-cylinder two-cycle engine.
  • the increased efficacy of the pump means that mounting location is not critical, and therefore the mounting can be remote from the engine per se, thus avoiding any possibility of vapor lock due to engine heat.
  • a fuel pump for supplying fuel from a fuel source to the carburetor of a two-cycle internal-combustion engine having a plurality of cylinders comprising first and second and third chambers, pressure-responsive diaphragm means extending across each of said chambers, a fuel-supply chamber having a fuel-source connection and having overlapping connection with said first and second chambers, an inlet check valve at the connection between said fuel-supply chamber and said second chamber, means including an outlet check valve connecting said second and third chambers, said third chamber including a fuel-output connection, first crankcase-connection means on the opposite side of the diaphragm at said first chamber for a first phase of pulsed operation thereof in accordance with a firstphase, second crankcase-connection means on the opposite side of the diaphragm at said second chamber for pulsed operation thereof in accordance with a second phase in phase-displaced relation to said first phase, and third crankcase-connection means on the opposite side of the diaphragm at said third chamber for pulsed operation thereof in phase
  • a fuel pump for supplying fuel from a fuel source to the fuel inlet of an internal-combustion engine having an output shaft and shaft-connected means for generating in separate outlets first and second fluid-pressure pulse trains in phase-displaced relation and synchronous with shaft rotation, said pump comprising first and second chambers with pressure-responsive diaphragm means extending across each of said chambers, means including a fuel-supply chamber interconnecting said first and second chambers, an inlet check valve at the connection between said fuel-supply chamber and said second chamber, means including an outlet check valve connected to said second chamber and having means for supplying the output of said outlet check valve to the fuel inlet of the engine, first connection means on the opposite side of the diaphragm at said first chamber for connection to the first pulsed fluid-pressure outlet of such an associated intemalcombustion engine, and second connection means on the opposite side of the diaphragm at said second chamber for connection to the second pulsed fluidpressure outlet of the engine, whereby said inlet check valve is subjected to the push-pull differential-pressure
  • said fuel-supply chamber includes strainer means separating the space within said chamber into an unstrained-fuel inlet volume and a strained-fuel outlet volume, said strainedfuel outlet volume communicating directly with both said inlet check valve and said first-mentioned chamber, whereby both said first and second diaphragmoperated chambers operate only upon fuel which has passed said strainer means.
  • a pump for supplying fluid from a fluid source to a fluid-delivery outlet, cyclically operative means for developing separate pulsed-cycle outputs in constant phase-displaced relation said pump comprising first and second chambers with flexible diaphragm means extending across each of said chambers, means including a fluidsupply chamber interconnecting said first and second chambers, an inlet check valve at the connection between said fluid-supply chamber and said second chamber, means including an outlet check valve connected to said second chamber and having means for supplying the output of said outlet check valve to said fluid-delivery outlet, first connection means on the opposite side of the diaphragm at said first chamber for operative connection to one of said pulsed-cycle outputs of said cyclically operative means, and second connection means on the opposite side of the diaphragm at said second chamber for operative connection to the other of said pulsed-cycle outputs of said cyclically operative means, whereby said inlet check valve is subjected to the push-pull differential-pressure fluctuation generated by phase-displaced excitation of the respective

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
US416832A 1973-11-19 1973-11-19 Fuel pump Expired - Lifetime US3924975A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US416832A US3924975A (en) 1973-11-19 1973-11-19 Fuel pump
CA210,224A CA997209A (en) 1973-11-19 1974-09-27 Fuel pump
GB4266174A GB1456924A (en) 1973-11-19 1974-10-01 Fluid pumps
AU74016/74A AU479363B2 (en) 1973-11-19 1974-10-04 Fuel pump
FR7434092A FR2251719B1 (sv) 1973-11-19 1974-10-10
DE2449522A DE2449522C3 (de) 1973-11-19 1974-10-17 Mehrstufige Membranpumpe zur Brennstoff-Förderung
SE7414450A SE399943B (sv) 1973-11-19 1974-11-18 Brenslepump
JP13262274A JPS5319730B2 (sv) 1973-11-19 1974-11-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US416832A US3924975A (en) 1973-11-19 1973-11-19 Fuel pump

Publications (2)

Publication Number Publication Date
USB416832I5 USB416832I5 (sv) 1975-01-28
US3924975A true US3924975A (en) 1975-12-09

Family

ID=23651489

Family Applications (1)

Application Number Title Priority Date Filing Date
US416832A Expired - Lifetime US3924975A (en) 1973-11-19 1973-11-19 Fuel pump

Country Status (7)

Country Link
US (1) US3924975A (sv)
JP (1) JPS5319730B2 (sv)
CA (1) CA997209A (sv)
DE (1) DE2449522C3 (sv)
FR (1) FR2251719B1 (sv)
GB (1) GB1456924A (sv)
SE (1) SE399943B (sv)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092264A2 (en) * 1982-04-21 1983-10-26 Shell Internationale Researchmaatschappij B.V. Two-stage volumetric pump and fuel injection process for liquefied petroleum gases
US4763626A (en) * 1987-03-12 1988-08-16 Brunswick Corporation Feedback fuel metering control system
US4821688A (en) * 1988-07-12 1989-04-18 Brunswick Corporation Automatic oil-fuel mixer with auxiliary chamber
US4840148A (en) * 1987-09-10 1989-06-20 Brunswick Corporation Two cycle engine with low pressure crankcase fuel injection
US4846118A (en) * 1988-06-14 1989-07-11 Brunswick Corporation Duel fuel pump and oil-fuel mixing valve system
US4848283A (en) * 1988-04-15 1989-07-18 Brunswick Corporation Marine engine with combination vapor return, crankcase pressure, and cooled fuel line conduit
US4876993A (en) * 1988-07-12 1989-10-31 Brunswick Corporation Fuel system with vapor bypass of oil-fuel mixer halting oil pumping
US4887559A (en) * 1988-04-01 1989-12-19 Brunswick Corporation Solenoid controlled oil injection system for two cycle engine
US4903649A (en) * 1987-03-12 1990-02-27 Brunswick Corporation Fuel supply system with pneumatic amplifier
US4940027A (en) * 1988-04-15 1990-07-10 Brunswick Corp. Marine engine with water cooled fuel line from remote tank
US4955943A (en) * 1988-04-01 1990-09-11 Brunswick Corporation Metering pump controlled oil injection system for two cycle engine
US5203306A (en) * 1990-03-02 1993-04-20 Outboard Marine Corporation Fuel feed system
US5829395A (en) * 1996-05-08 1998-11-03 Racine Railroad Products, Inc. Rail saw power head with two cycle engine and lube oil metering system
US6158972A (en) * 1999-03-16 2000-12-12 Federal-Mogul World Wide, Inc. Two stage pulse pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381741A (en) * 1981-10-08 1983-05-03 Outboard Marine Corporation Mechanical fuel pressure operated device for supplying a fuel/oil mixture
US6446611B2 (en) 2000-03-06 2002-09-10 Nippon Carburetor Co., Ltd. (Kabushikikaisha Nihon Kikaki Seisakusho) Pulsation type diaphragm pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713858A (en) * 1950-04-21 1955-07-26 Scott Atwater Mfg Co Inc Gas pump for outboard motor
US3424091A (en) * 1966-10-03 1969-01-28 Tillotson Mfg Co Fuel pump for charge forming apparatus
US3556687A (en) * 1969-05-21 1971-01-19 Walbro Corp Fuel pump for small engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835239A (en) * 1955-02-03 1958-05-20 Kiekhaefer Corp Fuel pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713858A (en) * 1950-04-21 1955-07-26 Scott Atwater Mfg Co Inc Gas pump for outboard motor
US3424091A (en) * 1966-10-03 1969-01-28 Tillotson Mfg Co Fuel pump for charge forming apparatus
US3556687A (en) * 1969-05-21 1971-01-19 Walbro Corp Fuel pump for small engines

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092264A3 (en) * 1982-04-21 1985-11-06 Shell Internationale Research Maatschappij B.V. Two-stage volumetric pump and fuel injection process for liquefied petroleum gases
EP0092264A2 (en) * 1982-04-21 1983-10-26 Shell Internationale Researchmaatschappij B.V. Two-stage volumetric pump and fuel injection process for liquefied petroleum gases
US4763626A (en) * 1987-03-12 1988-08-16 Brunswick Corporation Feedback fuel metering control system
US4903649A (en) * 1987-03-12 1990-02-27 Brunswick Corporation Fuel supply system with pneumatic amplifier
US4840148A (en) * 1987-09-10 1989-06-20 Brunswick Corporation Two cycle engine with low pressure crankcase fuel injection
US4887559A (en) * 1988-04-01 1989-12-19 Brunswick Corporation Solenoid controlled oil injection system for two cycle engine
US4955943A (en) * 1988-04-01 1990-09-11 Brunswick Corporation Metering pump controlled oil injection system for two cycle engine
US4848283A (en) * 1988-04-15 1989-07-18 Brunswick Corporation Marine engine with combination vapor return, crankcase pressure, and cooled fuel line conduit
US4940027A (en) * 1988-04-15 1990-07-10 Brunswick Corp. Marine engine with water cooled fuel line from remote tank
US4846118A (en) * 1988-06-14 1989-07-11 Brunswick Corporation Duel fuel pump and oil-fuel mixing valve system
US4876993A (en) * 1988-07-12 1989-10-31 Brunswick Corporation Fuel system with vapor bypass of oil-fuel mixer halting oil pumping
US4821688A (en) * 1988-07-12 1989-04-18 Brunswick Corporation Automatic oil-fuel mixer with auxiliary chamber
US5203306A (en) * 1990-03-02 1993-04-20 Outboard Marine Corporation Fuel feed system
US5829395A (en) * 1996-05-08 1998-11-03 Racine Railroad Products, Inc. Rail saw power head with two cycle engine and lube oil metering system
US6158972A (en) * 1999-03-16 2000-12-12 Federal-Mogul World Wide, Inc. Two stage pulse pump

Also Published As

Publication number Publication date
AU7401674A (en) 1976-04-08
USB416832I5 (sv) 1975-01-28
FR2251719B1 (sv) 1978-08-11
SE7414450L (sv) 1975-05-20
JPS5319730B2 (sv) 1978-06-22
JPS5083622A (sv) 1975-07-07
SE399943B (sv) 1978-03-06
FR2251719A1 (sv) 1975-06-13
GB1456924A (en) 1976-12-01
DE2449522B2 (de) 1980-08-21
CA997209A (en) 1976-09-21
DE2449522A1 (de) 1975-05-22
DE2449522C3 (de) 1981-04-02

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