US3879042A - Injection pump - Google Patents

Injection pump Download PDF

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Publication number
US3879042A
US3879042A US392783A US39278373A US3879042A US 3879042 A US3879042 A US 3879042A US 392783 A US392783 A US 392783A US 39278373 A US39278373 A US 39278373A US 3879042 A US3879042 A US 3879042A
Authority
US
United States
Prior art keywords
pump
engine
bearing cover
sealing
sealing rings
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
US392783A
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English (en)
Inventor
Andrzej Krainski
Krzysztof Lendzion
Andrzej Lojek
Jerzy Wewior
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.)
WARSZAWSKIE ZAKLADY MECHNICZNE
WARSZAWSKIE ZAKLADY MECHNICZNE DELTA-WZM
Original Assignee
WARSZAWSKIE ZAKLADY MECHNICZNE
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 WARSZAWSKIE ZAKLADY MECHNICZNE filed Critical WARSZAWSKIE ZAKLADY MECHNICZNE
Application granted granted Critical
Publication of US3879042A publication Critical patent/US3879042A/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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements

Definitions

  • the invention relates to an injection pump for internal combustion engines, especially a multi-sectional series pump, which driving gears are lubricated with fuel.
  • the cam-shaft (6) is sealed against the inner of the engine by means of two sealing rings (ll and 12) mounted in the bearing cover (13) of the pump, whereby the chamber l4) between said sealing rings is connected with the environment through a hole 15) made in the bearing cover l3) in such way that probable leakages through the sealing ring (11) nearer to the drive chamber (IQ) of the pump will flow to the outside of the engine body.
  • the invention relates to an injection pump for inter nal combustion engines. especially to multi-section series pump. the driving gears of which are lubricated with fuel.
  • injection pumps in which the excess of fuel being supplied by the pump to the channel and the supplying space of the pumping sets is drained back to the fuel tank not immediately from the supplying space but through the drive chamber containing particularly the cam-shaft, the followers. and the return springs of pistons.
  • the fuel flowing continuously through the drive chamber of the pump lubricates and cools its driving gears.
  • the conduit taking off the fuel 'from the drive chamber to the tank is connected to the chamber over an overflow valve. Said valve maintains a low pressure in the drive chamber. necessary for to avoid aerating of the injection system. Owing to said pressure maintained within the drive chamber. the last must be suitably tight. Especially the cam-shaft of the pump must be reliably sealed.
  • the object of the invention is to seal the cam-shaft of the pump in a way that eliminates the possibility of penetrating the fuel into the inner of the engine.
  • Said object has been achieved by sealing the output of the cam-shaft against the inner of the engine by means of two sealing rings arranged in the bearing cover of the pump in such a way that probable leakages through the sealing nearer to the inner of the pump will flow beyond the engine. playing thus part of an easily perceptible signal of wearing of the sealing.
  • the pumping assemblies are mounted, composed of cylinders 2 and pistons 3.
  • the pistons 3 are driven by means of roll followers 4 actuated by cams 5 of the cam-shaft 6 of the pump.
  • the return springs 7 withdraw the pistons 3 from the cylinders 2 as the cams 5 retire.
  • the end 8 of the cam-shaft 6 of the pump comes inside the casing 9 of the gear coupling said cam-shaft with the crankshaft of the engine.
  • the inner of the pump. comprising said gears is called drive chamber 10.
  • the uppermost portion of the drive chamber 10 being termed supply space of pumping assemblies, there is connected a conduit not shown in the drawing, which feeds the fuel supplied by the feeding pump to the supply space.
  • the excess of fuel fed to the supply space of the injection pump flows down to the bottom of the drive chamber 10 and then to the gear chamber of the controller. not shown in the drawing. wherefrom it is taken off through the overflow valve back to the fuel tank.
  • With respect to the pressure in the drive chamber 10, maintained by the overflow valve. said chamber must be appropriately sealed.
  • the sealing of the output of the cam-shaft 6 consists of the sealing rings II and 12 mounted in the bearing cover 13 of the pump.
  • the space 14 between said sealing rings is. through the hole 15 made in the bearing cover 13 of the pump. connected with the environment. by means of an additional hole 16 in the mounting flange 17 of the pump.
  • the sealing ring ll nearer to the inner 10 of the pump is submitted to the pressure of the fuel inside the pump, thus being worn more intensively than the sealing ring 12 from the engine side.
  • Such sealing eliminates completely the possiblity of penetration of the fuel from inside 10 the pump into the engine, since probable leakages through the sealing ring 11 located nearer to the inner 10 of the pump flow out of the space between the sealing rings 14 beyond the engine. Said leakages are easily perceptible signals of waring of the sealing ring.
  • An injection pump for internal combustion engines particularly a multi-section series pump having driving gears lubricated with fuel, comprising in combination a cam shaft; a bearing cover with an opening; two sealing rings mounted in said bearing cover for sealing said cam shaft against the interior of said engine, the space between said sealing rings forming a chamber communicating with the outside environment through said opening in said bearing cover, one of said sealing rings being closer to the drive chamber of said pump. whereby leakage through said one sealing ring closer to the drive chamber flows to the outside of the engine body.

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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)
US392783A 1972-09-16 1973-08-29 Injection pump Expired - Lifetime US3879042A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL15777272 1972-09-16

Publications (1)

Publication Number Publication Date
US3879042A true US3879042A (en) 1975-04-22

Family

ID=19959953

Family Applications (1)

Application Number Title Priority Date Filing Date
US392783A Expired - Lifetime US3879042A (en) 1972-09-16 1973-08-29 Injection pump

Country Status (3)

Country Link
US (1) US3879042A (enrdf_load_stackoverflow)
DE (1) DE2345354A1 (enrdf_load_stackoverflow)
FR (1) FR2200445B3 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5324046A (en) * 1991-06-18 1994-06-28 Cmt Costruzioni Meccaniche E Technologia S.P.A. Sealing device for operating shafts in food processing machines
EP0790403A1 (en) * 1996-02-16 1997-08-20 LUCAS INDUSTRIES public limited company Fuel injection pump with improved shaft seal system
WO2009138275A1 (de) * 2008-05-14 2009-11-19 Robert Bosch Gmbh Kraftstoffeinspritzsystem einer brennkraftmaschine
WO2012059298A1 (de) * 2010-11-04 2012-05-10 Robert Bosch Gmbh Kraftstoff-fördereinrichtung für eine brennkraftmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3018737A (en) * 1958-01-24 1962-01-30 Ernest E Cook Pump structure
US3138103A (en) * 1961-12-26 1964-06-23 Allis Chalmers Mfg Co Fuel supplying mechanism
US3292554A (en) * 1964-02-15 1966-12-20 Hydraulik Gmbh Axial piston device
US3426696A (en) * 1967-03-27 1969-02-11 Bendix Corp Tandem pump
US3624823A (en) * 1969-03-18 1971-11-30 Bosch Gmbh Robert Multicylinder fuel injection pump for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3018737A (en) * 1958-01-24 1962-01-30 Ernest E Cook Pump structure
US3138103A (en) * 1961-12-26 1964-06-23 Allis Chalmers Mfg Co Fuel supplying mechanism
US3292554A (en) * 1964-02-15 1966-12-20 Hydraulik Gmbh Axial piston device
US3426696A (en) * 1967-03-27 1969-02-11 Bendix Corp Tandem pump
US3624823A (en) * 1969-03-18 1971-11-30 Bosch Gmbh Robert Multicylinder fuel injection pump for internal combustion engines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5324046A (en) * 1991-06-18 1994-06-28 Cmt Costruzioni Meccaniche E Technologia S.P.A. Sealing device for operating shafts in food processing machines
EP0790403A1 (en) * 1996-02-16 1997-08-20 LUCAS INDUSTRIES public limited company Fuel injection pump with improved shaft seal system
WO2009138275A1 (de) * 2008-05-14 2009-11-19 Robert Bosch Gmbh Kraftstoffeinspritzsystem einer brennkraftmaschine
WO2012059298A1 (de) * 2010-11-04 2012-05-10 Robert Bosch Gmbh Kraftstoff-fördereinrichtung für eine brennkraftmaschine

Also Published As

Publication number Publication date
FR2200445A1 (enrdf_load_stackoverflow) 1974-04-19
DE2345354A1 (de) 1974-03-21
FR2200445B3 (enrdf_load_stackoverflow) 1976-07-30

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