US3361075A - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

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Publication number
US3361075A
US3361075A US499360A US49936065A US3361075A US 3361075 A US3361075 A US 3361075A US 499360 A US499360 A US 499360A US 49936065 A US49936065 A US 49936065A US 3361075 A US3361075 A US 3361075A
Authority
US
United States
Prior art keywords
arm
piston
spring
lever
fuel injection
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
US499360A
Other languages
English (en)
Inventor
Jean G Cadiou
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.)
Automobiles Citroen SA
Original Assignee
Andre Citroen SA
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 Andre Citroen SA filed Critical Andre Citroen SA
Application granted granted Critical
Publication of US3361075A publication Critical patent/US3361075A/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
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/02—Pumps peculiar thereto

Definitions

  • the present invention relates to fuel injection pumps for feeding the cylinders of an internal combustion engrne, the pump being composed essentially of a cylinder having a single aperture serving both for inlet and discharge of the fuel, a piston, and a lever pivotally mounted at its centre.
  • the latter has a first arm which drives, by its end, the piston into the cylinder during the discharge stroke and a second arm whose end is pushed back by the apex of a cam.
  • the piston is returned by the first arm of the lever during the inlet stroke and the play or clearance between these two parts is taken up by means of a bent or curved spring, one end of which is secured to or integral with the end of the first arm of said lever and the other end of which is secured to the piston.
  • the spring preferably comprises two wires disposed symmetrically on either side of the first arm and the piston.
  • the return of the second arm of the lever against the surface of the cam during the inlet stroke and the taking up of the clearance between these two parts are effected by a hairpin spring, the end of one limb of which passes around half the circumference of the pivot axis of the lever, and is secured to this lever, the end of the other limb being mounted to slide in a rotary joint, itself mounted to oscillate in a corresponding housing in the casing.
  • the spring may be composed of a plurality of wires disposed side by side or on either side of the second arm of the lever.
  • a pump with a cylinder 1 that has a single aperture 2 which serves for the inlet and discharge of fuel into and out of a chamber 3 defined between the cylinder 1 and a piston 4.
  • the outer end of the latter is bored at 5, and in this bore there engages a pin 6, which projects away from the bore 5.
  • the other end 6a of the pin 6 extends into an orifice 7 located at the end of a first arm 8a of a lever 8.
  • the latter is pivotally mounted at its centre about a spindle or shaft 9 and its second arm 85 is provided with a roller 10 which is supported on the surface of a cam 11 rotatable in the direction of the arrow F at a suitable speed.
  • the cam 11 by each of its apices or crowns (4 in this example), causes the piston 4 to be driven into the cylinder 1 by means of the lever 8 at the moment of the fuel discharge phase and its injection into the cylinder. Then the fuel is admitted into the chamber 3 while the piston 5 and the first arm 8a are being lifted again and the second arm 8b is being lowered.
  • the piston 4 is returned when the arm 8a rises up and the play between the piston 4, the needle 6 and the arm 8 is permanently taken up by means of a spring 12.
  • the latter constituted by a fiat wire bent or curved at its centre, has a first limb 1211 which is fixed at its end to the end of the arm 8a.
  • the second limb 12b of the spring 12 has a loop, which is not entirely closed, which passes over a peg 13 secured to the upper end of the piston 4.
  • two springs such as 12 can be placed symmetrically on either side of the arm 8a.
  • a spring 14 The latter has a semi-circular limb 14a which partially surrounds the essential parts of the lever 8 and the spindle or shaft 9 and which is fixed at its end through a catch of the lever 8.
  • the end of the other limb 14b of the spring 14 passes into a bore 15a of a rotary (ball-and-socket) joint 15 where it is able to slide.
  • the joint 15 is itself mounted to oscillate in a suitable housing 16 in the casing of the assembly of the fuel injection device.
  • the spring 14 may be composed of a plurality of identical wires disposed parallel to one another. The spring 14 ensures that all the movable parts are returned without introducing abnormal forces due to the particular articulations of the end of its limb 14b.
  • the assembly of the pump is disposed in planes perpendicular to the drive shaft and has a generally fiat form, which is less cumbersome in the axial direction of the shaft.
  • the ends of the latter are free and are easily accessible, one may co-operate with rotation means and the other may serve to control another member, as for example fuel distributing means.
  • a fuel injection pump comprising a cylinder, a single inlet and discharge aperture adjacent to one end of said cylinder, a piston within said cylinder, a twoarmed lever pivotally mounted at its center, a spring connected between one arm of said lever and said piston, a rotary cam operable to oscillate the other arm of said lever and reciprocate said piston through said spring.
  • the fuel injection pump defined in claim 1 further comprising a bore in said piston, an orifice in said one arm, and a pin, one end of said pin being disposed in said bore and the other arm of said pin being disposed in said orifice whereby when said one arm moves toward said piston said spring is contracted and said pin is driven to the end of said bore to drive said piston toward said aperture.
  • said spring is generally C-shaped and secured at one end to said lever and at the other end to said piston.
  • the fuel injection pump defined in claim 3 further comprising a roller rotatably mounted on said other arm and engaging at its periphery said cam, a pump casing, a socket in said casing, a ball in said socket, a second spring having two limbs and extending substantially halfway around the pivot of said lever, one of said limbs secured to said lever and the other of said limbs extending into said ball, whereby said second spring urges said other arm toward said cam to assure that said roller always contacts said cam and said ball and socket permit said second spring to flex freely during said oscillation of said lever toward said cam to assure that said roller is always in contact with said cam.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)
US499360A 1965-04-16 1965-10-21 Fuel injection pump Expired - Lifetime US3361075A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR13690A FR1440148A (fr) 1965-04-16 1965-04-16 Pompe d'injection d'essence

Publications (1)

Publication Number Publication Date
US3361075A true US3361075A (en) 1968-01-02

Family

ID=8576706

Family Applications (1)

Application Number Title Priority Date Filing Date
US499360A Expired - Lifetime US3361075A (en) 1965-04-16 1965-10-21 Fuel injection pump

Country Status (9)

Country Link
US (1) US3361075A (de)
BE (1) BE672598A (de)
DE (1) DE1476280A1 (de)
ES (1) ES319629A1 (de)
FR (1) FR1440148A (de)
GB (1) GB1066538A (de)
LU (1) LU49869A1 (de)
NL (1) NL6516248A (de)
SE (1) SE306452B (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1280511A (en) * 1916-03-15 1918-10-01 Dunlop Rubber Co Pump.
US1717365A (en) * 1927-05-11 1929-06-18 Norman C Bremer Chain lubricator
US2100972A (en) * 1934-06-09 1937-11-30 Louis J Michaels Air compressor
US2257387A (en) * 1940-05-20 1941-09-30 Robert E Kinkade High pressure pump
US2510003A (en) * 1946-07-02 1950-05-30 Wieseltier Zeev Coin freed device for dispensing liquids
US3291350A (en) * 1963-11-05 1966-12-13 Jerry P Malec Fluid pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1280511A (en) * 1916-03-15 1918-10-01 Dunlop Rubber Co Pump.
US1717365A (en) * 1927-05-11 1929-06-18 Norman C Bremer Chain lubricator
US2100972A (en) * 1934-06-09 1937-11-30 Louis J Michaels Air compressor
US2257387A (en) * 1940-05-20 1941-09-30 Robert E Kinkade High pressure pump
US2510003A (en) * 1946-07-02 1950-05-30 Wieseltier Zeev Coin freed device for dispensing liquids
US3291350A (en) * 1963-11-05 1966-12-13 Jerry P Malec Fluid pump

Also Published As

Publication number Publication date
NL6516248A (de) 1966-10-17
BE672598A (de) 1966-03-16
SE306452B (de) 1968-11-25
DE1476280A1 (de) 1969-07-31
FR1440148A (fr) 1966-05-27
GB1066538A (en) 1967-04-26
ES319629A1 (es) 1966-05-16
LU49869A1 (de) 1966-01-18

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