US3919990A - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

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Publication number
US3919990A
US3919990A US471905A US47190574A US3919990A US 3919990 A US3919990 A US 3919990A US 471905 A US471905 A US 471905A US 47190574 A US47190574 A US 47190574A US 3919990 A US3919990 A US 3919990A
Authority
US
United States
Prior art keywords
pad
space
fuel injection
tappet
injection pump
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
US471905A
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English (en)
Inventor
Dirk Bastenhof
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.)
Everllence France SAS
Original Assignee
Semt
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 Semt filed Critical Semt
Application granted granted Critical
Publication of US3919990A publication Critical patent/US3919990A/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
    • F02M59/44—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
    • 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

Definitions

  • the invention relates to a fuel injection pump includ- [30] Foreign Application Prinrity Data mg an aperture pad mounted for slldmg mot1on wlthm J 76 1973 Franc 73 73x79 the pump casing and interposed between a plunger um L M piston and a tappet. Each hole of the pad is provided with an individual valve opening automatically during [52] US. Cl. 123/139 AC, 123/139 AC the upward motion of the pad through the force of [51] Int. Cl. F02m 39/00 [58] Field of Searchl23/ l 39 AC 139 AA 139 AR ertla due to the acceleration of the pad and by the air 123/139 139 compression within a space defined above the pad,
  • the present invention relates generally to fuel injection pumps and more particularly to an improved fuel injection pump for an internal combustion engine, comprising a constant-stroke, reciprocating plunger piston driven or operated by a tappet, lifter or like pusher member.
  • the fuel injection pumps associated with the cylinders, respectively, of an internal combustion engine and belonging to the aforesaid kind have been known for a long time.
  • In use such pumps however exhibit a number of inconveniences such as the danger of the control toothed rack becoming blocked or jammed through seizing or sticking thereof, which toothed rack. as known, provides for the control or adjustment of the fuel flow rate delivered.
  • the pumps in which the present invention is concerned comprise a piston driven by a tappet and a bolster, pad or like base member slidably mounted within the body or casing of the pump and interposed between the piston and the tappet.
  • Such an arrangement defines within the body or casing of the pump two spaces or chambers, namely a first space provided above the base member or pad towards the piston and a second space provided below the base member or pad towards the tappet.
  • the diameter of the tappet is larger than that of the base member or pad which also forms a cup-like seat for a piston-biasing return or drawback spring, air is compressed within both aforementioned spaces when the tappet actuates the pad hence the piston.
  • the present invention obviates the aforesaid drawbacks by providing an improved fuel injection pump definitely preventing the sticking or seizing of the toothed rack caused by air overpressure within the pump casing.
  • the invention has for its purpose to provide a fuel injection pump for an internal combustion engine, including a constant-strokereciprocating piston driven or actuated by a tappet as well as a pad, bolster or like base member interposed between the piston and the tappet, which pad is mounted for sliding motion within the pump casing or body, forms a cupshaped seat for a piston-biasing return spring and comprises at least one thoroughfare hole providing communication between a first space formed above the pad towards the piston and a second space formed below the pad towards the tappet, said device being characterized in that each aforesaid hole is provided with a valve opening automatically during the upward motion of the pad through the inertia force due to the acceleration of the pad and through air compression within said first space and closing automatically during the downward motion of the pad for producing a vacuum or like underpressure through suction or drawing in within the first space.
  • each aforesaid valve comprises a resiliently flexible or deformable plate secured to said pad on the side of said second space formed within the pump casing between the pad and the tappet.
  • each aforesaid valve consists of a small disk or like plate member mounted in floating relationship within a recess or housing formed in a ring-shaped element rigidly secured to said pad.
  • the aforesaid recess is suitably machined to also provide for the escape of the compressed air during the upward motion of the pad.
  • FIG. 1 is a fragmentary view in longitudinal crosssection with parts broken away, of a fuel injection pump provided with a valve according to a first form of embodiment of the invention
  • FIG. 2 is a sectional view of the pad provided with a valve according to a second form of embodiment of the invention.
  • FIGS is a view in cross-section taken upon the line III-III in FIG. 2. 7
  • a fuel injection pump of the kind in question essentially comprises a pump barrel or casing l enclosing a constant-stroke, reciprocating piston 3 and a tappet 2.
  • a pad or like base member 4 is interposed between the tappet 2 and the piston 3 and is mounted for sliding motion within the pump casing 1.
  • the pad 4 forms a cup-shaped seat for a return spring 5 biasing the piston 3 and comprises a plurality of thoroughfare holes 6 providing a constant communication between a first space or chamber 7 defined above the pad 4 towards the piston 3 and a second space or chamber 8 defined below the pad 4 towards the tappet 2.
  • a cam rigidly connected to a shaft 10 and operating the tappet 2 by acting upon a follower or like roller 11 secured to said tappet 2.
  • a toothed rack operated by suitable means for turning the plunger piston 3 while allowing same to move upwards and downwards inside of the pump barrel or casing l.
  • the plunger piston 3 is as known per se provided at its upper end portion with a helical ramp-like formation l3 providing for the induction of fuel in accordance with the rotary position of the plunger piston 3 controlled by the toothed rack 12.
  • a breather or like snifting valve through which the space 8 is communicating with or vented to the outer atmosphere, which breather or snifting valve comprises a number of baffles 15 to cause as known per se the separation of fuel from air.
  • a snifting valve or breather such as 14 may be dispensed with and when it is omitted, the entrapped air is discharged or drained off through the duct 16.
  • each thoroughfare hole 6 in the pad 4 is provided with a valve 17 mounted on the side of the space or chamber 8.
  • each valve 17 merely assumes the shape of a resiliently flexible plate 18 secured at 19 onto the pad 4.
  • the fastening may be effected by any suitable means such as rivets, screws, welding or the like. Thereby is achieved a particularly simple valving arrangement.
  • FIGS. 2 and 3 there is shown a second form of embodiment of the valve 17 according to the invention.
  • a valve consists of a disk or like small plate member 21 made from a suitable material so as to be able to close the thoroughfare holes 6 of the pad 4 and fitted or accommodated in loosely floating relationship within a recess or like housing 22 machined within a ring-shaped holder or like annular support member affixed to the pad 4 by any suitable means such as screws, rivets or welding.
  • FIG. 1 As is better apparent from FIG.
  • the recesses 22 for the small plates or disks 21 communicate with recessed channel portions or grooves 23 formed in the annular support or ring-shaped holder 20 and enabling the air to be discharged into the space 8 when the pad 4 is moving upwards within the pump casing.
  • valves 17 The operation and the purpose of the valves 17 will now be briefly explained when the pump is in operation.
  • valves 17 close automatically. i.e. as soon as the compressed air has been expelled from the space 7.
  • the valves 17 being thus closed and the pad effecting its downward motion by sliding within the pump casing I, there is provided a vacuum within the chamber 7, ie there is produced a suction past the toothed rack 12 thereby advantageously preventing same to become seized by the fuel leaks.
  • the compressed air within the space 8 is then discharged or released through the breather or snifting valve l4 and/or through the fuel-leak recovering duct 16.
  • a fuel injection pump for an internal combustion engine including a constant-stroke, reciprocating plunger piston driven according to a straight translatory motion by a tappet and rotated for adjustment by a gear consisting of an operating control toothed rack and a driven pinion coaxial with said plunger piston, and a pad interposed between said plunger piston and said tappet, which pad is slidably mounted within the pump.
  • each thoroughfare hole is provided with an individual valve opening automatically during the upward motion of said pad through the force of inertia due to the acceleration of said pad and by the air compression within said first space-and closing automatically during the downward motion of said pad for providing a vacuum through suction or drawing into said first space.
  • each aforesaid valve comprises a resiliently flexible plate covering its associated aforesaid hole and secured on one side of said hole to said pad, on the side of said second space.
  • each aforesaid valve consists of a small disk or like plate member loosely fitted in floating relationship within a recess provided in a ring-shaped element rigidly connected in coaxial relationship to said pad, on second space and said recesses for allowing the comthe side of said second space.
  • a fuel injection pump according to claim 3, wherein said ring-shaped element comprises grooves or like channels providing communication between said 5 pressed air to be discharged or drained off during the upward motion of said pad.

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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)
  • Reciprocating Pumps (AREA)
US471905A 1973-06-26 1974-05-21 Fuel injection pump Expired - Lifetime US3919990A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7323379A FR2235290B1 (cs) 1973-06-26 1973-06-26

Publications (1)

Publication Number Publication Date
US3919990A true US3919990A (en) 1975-11-18

Family

ID=9121600

Family Applications (1)

Application Number Title Priority Date Filing Date
US471905A Expired - Lifetime US3919990A (en) 1973-06-26 1974-05-21 Fuel injection pump

Country Status (16)

Country Link
US (1) US3919990A (cs)
JP (1) JPS5442404B2 (cs)
BE (1) BE816933A (cs)
BR (1) BR7405206D0 (cs)
CH (1) CH576587A5 (cs)
CS (1) CS204985B2 (cs)
DD (1) DD113080A5 (cs)
DE (1) DE2429696B2 (cs)
ES (1) ES426967A1 (cs)
FR (1) FR2235290B1 (cs)
GB (1) GB1465348A (cs)
IT (1) IT1015061B (cs)
NL (1) NL167501C (cs)
PL (1) PL91640B1 (cs)
SU (1) SU564819A3 (cs)
YU (1) YU36799B (cs)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3319195B2 (ja) * 1994-12-05 2002-08-26 日本鋼管株式会社 α＋β型チタン合金の高靱化方法
JP6584175B2 (ja) * 2015-07-07 2019-10-02 株式会社前川製作所 極低温液体用ポンプ

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614944A (en) * 1969-09-11 1971-10-26 Ord Systems Ltd Engine apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614944A (en) * 1969-09-11 1971-10-26 Ord Systems Ltd Engine apparatus

Also Published As

Publication number Publication date
CS204985B2 (en) 1981-04-30
DD113080A5 (cs) 1975-05-12
ES426967A1 (es) 1976-07-16
NL7408582A (cs) 1974-12-30
AU6919774A (en) 1975-11-27
SU564819A3 (ru) 1977-07-05
CH576587A5 (cs) 1976-06-15
JPS5442404B2 (cs) 1979-12-14
PL91640B1 (cs) 1977-03-31
DE2429696B2 (de) 1976-12-02
NL167501C (nl) 1981-12-16
FR2235290A1 (cs) 1975-01-24
BE816933A (fr) 1974-10-16
YU36799B (en) 1984-08-31
YU179374A (en) 1981-11-13
JPS5037004A (cs) 1975-04-07
GB1465348A (en) 1977-02-23
DE2429696A1 (de) 1975-01-23
NL167501B (nl) 1981-07-16
BR7405206D0 (pt) 1975-06-17
FR2235290B1 (cs) 1977-12-23
IT1015061B (it) 1977-05-10

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