US2638053A - Liquid fuel injection pump for internal-combustion engines - Google Patents

Liquid fuel injection pump for internal-combustion engines Download PDF

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Publication number
US2638053A
US2638053A US137593A US13759350A US2638053A US 2638053 A US2638053 A US 2638053A US 137593 A US137593 A US 137593A US 13759350 A US13759350 A US 13759350A US 2638053 A US2638053 A US 2638053A
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United States
Prior art keywords
pump
liquid fuel
fuel injection
internal
injection pump
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Expired - Lifetime
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US137593A
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Nicolls Wilfrid Edward Walter
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CAV Ltd
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CAV Ltd
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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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
    • F02M2700/1317—Fuel pumpo for internal combustion engines
    • F02M2700/137—Fuel pump with control of fuel outlet of pumping chamber to delivery pipe

Definitions

  • This invention relates to a liquid fuel injection pump having one or more reciprocatory plungers for injecting liquid fuel into the cylinder or cylinders of an internal combustion engine, the pump being of the kind in which the fuel inlet port or each such port is controlled by the as: sociated plunger.
  • the object of the present invention is to enable this requirement to be met in a simpler manner than heretofore.
  • Figure 1 is a sectional elevation illustrating a pump embodying the invention.
  • Figure 2 is a cross section of the pump barrel on the line 2-2, Figure 1.
  • the greater part of the pump there shown is of known construction. It comprises a pump barrel a (or a plurality of such barrels arranged parallel with each other), the barrel or barrels being secured within a hollow body part b.
  • the reciprocatory plunger is actuated in one direction through a slipper d by a rotary cam c and in the opposite direction by a spring
  • the plunger 0 has formed on it in known manner a spill groove g, the position of which in relation to the inlet port or ports 11. in the bore can be varied by angular movement of the plunger about its axis. This movement is effected by the action of a governor or other controlling means on a slidable rack i engaging a pinion i on a sleeve m which is connected to the plunger by a cross pm n.
  • the barrel is provided with two main ports h which open into an annular feed chamber 0 in the body part, this chamber being supplied with fuel oil by a pipe connected to an inlet 11.
  • a small supplementary inlet port q is so disposed as shown relatively to the main ports that it can be closed by the plunger after the latter has moved through a distance of from 0.25-0.5 mm., beyond the position in which it has closed the main ports. Also loaded delivery valve 1' and hence at the injection nozzle in the engine will not commence until after both ports h, q have been closed. But with increasing speed of the pump, the instant of dlscharge will be progressively advanced owing to the resistance of the supplementary port q to flow through it from the pump barrel.
  • the supplementary port may be provided in other ways.
  • it may consist of a small notch formed in the upper part of the main port or each such port.
  • a liquid fuel pump having in combination a hollow body part provided with a fuel inlet passage, a barrel arranged in the hollow body part and provided with at least one main fuel inlet port and a restricted supplementary inlet port, both ports being in communication with the fuel inlet passage, and a plunger slidable in the barrel for closing both ports and discharging liquid fuel from the barrel, the restricted supplementary inlet port being disposed in relation to the main inlet port so that it is closed by the plunger shortly after the main port has been closed thereby, and said supplementary inlet port being dimensioned so that when the pump spee is high only a limited amount of fuel can escape therethrough whereas at lower pump speeds a greater amount of fuel can escape through said por 2.

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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)

Description

May 1953 w. E. w. NICOLLS 2,638,053
LIQUID FUEL INJECTION PUMP FOR INTERNAL-CQMBUSTION ENGINES Filed Jan. 9, 1950 Patented May 12, 1953 UNITED STATES PATENT OFFICE LTQUID FUEL INJECTION PUMP FOR INTERNAL- COMBUSTION ENGINE S Application January 9, 1950, Serial No. 137,593 In Great Britain January 13, 1949 2 Claims.
This invention relates to a liquid fuel injection pump having one or more reciprocatory plungers for injecting liquid fuel into the cylinder or cylinders of an internal combustion engine, the pump being of the kind in which the fuel inlet port or each such port is controlled by the as: sociated plunger.
For some purposes, it is desired to be able to advance the instant at which the fuel is injected into the engine with increasing engine speed, and the object of the present invention is to enable this requirement to be met in a simpler manner than heretofore.
In the accompanying drawings:
Figure 1 is a sectional elevation illustrating a pump embodying the invention, and
Figure 2 is a cross section of the pump barrel on the line 2-2, Figure 1.
Referring to the drawings, the greater part of the pump there shown is of known construction. It comprises a pump barrel a (or a plurality of such barrels arranged parallel with each other), the barrel or barrels being secured within a hollow body part b. The reciprocatory plunger is actuated in one direction through a slipper d by a rotary cam c and in the opposite direction by a spring For regulating the output of the pump, the plunger 0 has formed on it in known manner a spill groove g, the position of which in relation to the inlet port or ports 11. in the bore can be varied by angular movement of the plunger about its axis. This movement is effected by the action of a governor or other controlling means on a slidable rack i engaging a pinion i on a sleeve m which is connected to the plunger by a cross pm n.
In the pump above described the barrel is provided with two main ports h which open into an annular feed chamber 0 in the body part, this chamber being supplied with fuel oil by a pipe connected to an inlet 11.
According to the present invention there is provided in the barrel a small supplementary inlet port q. This latter is so disposed as shown relatively to the main ports that it can be closed by the plunger after the latter has moved through a distance of from 0.25-0.5 mm., beyond the position in which it has closed the main ports. Also loaded delivery valve 1' and hence at the injection nozzle in the engine will not commence until after both ports h, q have been closed. But with increasing speed of the pump, the instant of dlscharge will be progressively advanced owing to the resistance of the supplementary port q to flow through it from the pump barrel.
By the expedient above described the automatic advancing of the instant of fuel injection with increasing engine speed can be effected in a very simple and satisfactory manner.
The invention is not, however, restricted to the example described, as the supplementary port may be provided in other ways. Thus, it may consist of a small notch formed in the upper part of the main port or each such port. Further it will be understood that whereas in the foregoing only one pump barrel and plunger, with their associated parts, have been described, each barrel in a multi-plunger pump is provided in like manner with a supplementary port.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
1. A liquid fuel pump having in combination a hollow body part provided with a fuel inlet passage, a barrel arranged in the hollow body part and provided with at least one main fuel inlet port and a restricted supplementary inlet port, both ports being in communication with the fuel inlet passage, and a plunger slidable in the barrel for closing both ports and discharging liquid fuel from the barrel, the restricted supplementary inlet port being disposed in relation to the main inlet port so that it is closed by the plunger shortly after the main port has been closed thereby, and said supplementary inlet port being dimensioned so that when the pump spee is high only a limited amount of fuel can escape therethrough whereas at lower pump speeds a greater amount of fuel can escape through said por 2. A liquid fuel pump as claimed in claim 1, in which the said supplementary inlet port is spaced from the main port.
WILFRID EDWARD WALTER NICOLLS.
References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,361,817 Bolli et al. Oct. 31, 1944 2,382,000 Bremser Aug. 14, 1945 2,384,012 Bremser Sept, 4, 1945
US137593A 1949-01-13 1950-01-09 Liquid fuel injection pump for internal-combustion engines Expired - Lifetime US2638053A (en)

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Application Number Priority Date Filing Date Title
GB2638053X 1949-01-13

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US2638053A true US2638053A (en) 1953-05-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926163A (en) * 1973-06-26 1975-12-16 Semt Method and device for stopping an internal combustion engine with fuel injection in case of overspeed
US4163634A (en) * 1977-11-25 1979-08-07 Caterpillar Tractor Co. Fuel pump plunger

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2361817A (en) * 1940-06-10 1944-10-31 Adolph Saurer Sa Fuel injection pump for internalcombustion engines
US2382000A (en) * 1941-09-20 1945-08-14 Bendix Aviat Corp Fuel injection pump
US2384012A (en) * 1942-09-22 1945-09-04 Bendix Aviat Corp Fuel injection apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2361817A (en) * 1940-06-10 1944-10-31 Adolph Saurer Sa Fuel injection pump for internalcombustion engines
US2382000A (en) * 1941-09-20 1945-08-14 Bendix Aviat Corp Fuel injection pump
US2384012A (en) * 1942-09-22 1945-09-04 Bendix Aviat Corp Fuel injection apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926163A (en) * 1973-06-26 1975-12-16 Semt Method and device for stopping an internal combustion engine with fuel injection in case of overspeed
US4163634A (en) * 1977-11-25 1979-08-07 Caterpillar Tractor Co. Fuel pump plunger

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