EP1236894B1 - Pompe électromagnetique - Google Patents

Pompe électromagnetique Download PDF

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Publication number
EP1236894B1
EP1236894B1 EP20020004696 EP02004696A EP1236894B1 EP 1236894 B1 EP1236894 B1 EP 1236894B1 EP 20020004696 EP20020004696 EP 20020004696 EP 02004696 A EP02004696 A EP 02004696A EP 1236894 B1 EP1236894 B1 EP 1236894B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
piston element
oil
abutments
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
EP20020004696
Other languages
German (de)
English (en)
Other versions
EP1236894A1 (fr
Inventor
Pierluigi Dell'orto
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.)
Dell Orto SpA
Original Assignee
Dell Orto SpA
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 Dell Orto SpA filed Critical Dell Orto SpA
Publication of EP1236894A1 publication Critical patent/EP1236894A1/fr
Application granted granted Critical
Publication of EP1236894B1 publication Critical patent/EP1236894B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M3/00—Lubrication specially adapted for engines with crankcase compression of fuel-air mixture or for other engines in which lubricant is contained in fuel, combustion air, or fuel-air mixture
    • F01M3/02—Lubrication specially adapted for engines with crankcase compression of fuel-air mixture or for other engines in which lubricant is contained in fuel, combustion air, or fuel-air mixture with variable proportion of lubricant to fuel, lubricant to air, or lubricant to fuel-air-mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the present invention concerns an electromagnetically operated pump for the precise and controlled feeding of oil to two-stroke internal-combustion engines.
  • the present invention concerns a pump of this type, with the object to improve its characteristics as far as structural simplicity, and metering precision and easiness are concerned, all being very important in view of the special use for which said pump is intended invention has the features detailed in the characterising part of claim 1.
  • said fastening element consists of a fastener bearing on the end of said cylinder opposite to the chamber, stout spring means being interposed between said fastening element and the casing to fasten the cylinder therein, and the stroke of the piston element into said cylinder is limited exclusively by the cooperation between said abutments.
  • Fig. 1 is an axial section view of the improved pump according to the invention
  • Fig. 2 is a partial cross-section view of the pump, along the line II-II of fig. 1;
  • Fig. 3 is a perspective view of the means (fastener, washer, spring) to stop the pump cylinder into the casing;
  • Fig. 4 is an enlarged detail of fig. 1, showing how the abutments of the piston element cooperate with the stop element.
  • the pump according to the invention comprises a casing 1, containing a cylinder 2 and a piston element 3, axially movable into the cylinder 2 and crossed by a pipe 4 connected with branches 5 and 6 - for oil inlet and outlet respectively - of the casing 1.
  • a chamber 7 for pumping the oil to be fed delimited by the plane surface 8 of the casing 1, onto which bears the cylinder 2, and by the bottom end 9 of the piston element 3.
  • an electromagnetic coil 10 fed with pulse current in strict correlation with the running of the two-stroke engine to be equipped with the pump.
  • said coil 10 When energized, said coil 10 controls the movements of the piston element 3 towards the chamber 7, against the action of a spring 11 which acts in an opposite sense when the coil 10 is de-energized.
  • Two ball valves 12, 13, are provided in the casing 1 close to the oil pumping chamber 7, the first of said valves cooperating with the bottom end 9 of the piston element 3, in correspondence of the outlet of the pipe 4.
  • the valve 12 when the piston element 3 is moved by the electromagnetic coil 10, the valve 12 is closed while the valve 13 opens; viceversa, the valve 13 closes when the piston element 3 is moved by the spring 11 and while the valve 12 opens.
  • two opposite abutments 14, 15, are formed on the piston element 3, close to the end opposite to the bottom end 9, said abutments 14, 15, cooperating with corresponding abutments, 16 and 17 respectively, of an element apt to stop the cylinder 2 into the casing 1.
  • said stop element consists of a fastener 18 bearing onto the end of the cylinder 2 opposite to that contacting the plane surface 8 of the casing 1, said fastener 18 being pressed, through a bearing washer 18A, by a stout Belleville spring 19 engaging the plane surface 20 of the casing 1.
  • the axial dimensions of the piston element 3 and of its parts, and the axial position therein of the abutments 14, 15, are chosen so that the stroke C of said piston element 3 into the cylinder 2 is limited exclusively by the cooperation between said abutments and the abutments 16 and 17 respectively, and so that the bottom end 9 of the piston element 3 never gets in contact with the plane surface 8 of the casing 1.
  • Fig. 1 shows the piston element 3 with its bottom end 9 spaced apart from the plane surface 8 of the casing 1, and the pumping chamber 7 full of oil.
  • the abutment 14 of the piston element 3 is in contact with the abutment 16 of the fastener 18, pressed by the spring 11.
  • the coil 10 When, in operation, the coil 10 is energized, the piston element 3 moves towards the plane surface 8 compressing the oil into the chamber 7, while the valve 12 keeps closed the pipe 4 into which flows the oil, let in through the branch 5.
  • the oil pressure in the chamber 7 opens the valve 13 and the oil is fed through the branch 6 into the engine, in the exact and controlled amount corresponding to the volume of the chamber 7 which, at the end of the stroke, is occupied by the piston element 3.
  • the pump described heretofore has a very simple structure and its working is very reliable; but, above all, it can be very easily adapted, at extremely reduced costs, to the most different requirements of capacity: the volume of the oil pumping and metering chamber 7 occupied by the piston element 3 (namely, the amount of oil being fed at each piston stroke C) can in fact be easily adjusted, not only by acting on the distance between the abutments 14 and 15 of the piston element 3, but also by simply replacing the existing fastener 18 with a similar fastener of different thickness, or even by varying with a simple mechanical operation the thickness of the fastener 18 being used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • External Artificial Organs (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Claims (4)

  1. Pompe actionnée électromagnétiquement pour l'alimentation de moteurs à combustion interne à deux temps en quantités d'huile précises et commandées, du type comportant, dans une enveloppe (1) : un cylindre (2), un élément de fixation (18) apte à fixer le cylindre (2) à l'intérieur de l'enveloppe (1) ; un élément à piston (3) traversé par un conduit (4), mobile axialement dans ledit cylindre (2) ; une bobine électromagnétique (10) extérieure au cylindre (2), pour commander les mouvements de l'élément à piston (3) contre l'action d'un moyen à ressort (11) ; une chambre (7) de pompage et de dosage pour l'huile devant être débitée, à l'extrémité inférieure (9) de l'élément à piston (3) ; et des moyens à clapets (12, 13) logés dans ladite enveloppe (1) à proximité de ladite extrémité (9), l'un desdits moyens à clapets (12) coopérant avec ledit élément à piston (3), caractérisée en ce que deux butées opposées (14, 15) sont formées sur l'extrémité de l'élément à piston (3) opposée à ladite extrémité inférieure (9), lesdites butées (14, 15) coopérant avec des butées correspondantes (16, 17) dudit élément de fixation (18).
  2. Pompe selon la revendication 1, dans laquelle ledit élément de fixation (18) consiste en un organe de fixation annulaire (18) dont les deux faces forment lesdites butées correspondantes (16, 17), la course (C) de l'élément à piston (3) dans le cylindre (2) étant limitée exclusivement par la coopération entre lesdites butées (14, 15 et 16, 17), qui déterminent ainsi le dosage de l'huile devant être débitée.
  3. Pompe selon les revendications 1 et 2, dans laquelle ledit élément de fixation (18) consiste en un organe de fixation (18) portant sur l'extrémité du cylindre (2) opposée à la chambre (7), un moyen à ressort fort étant interposé entre ledit élément (18) et l'enveloppe (1) pour fixer le cylindre (2) dans celle-ci.
  4. Pompe selon la revendication 3, dans laquelle ledit moyen à ressort est constitué d'un ressort Belleville (19) agissant sur ledit organe de fixation (18) par l'intermédiaire d'une rondelle (18A).
EP20020004696 2001-03-01 2002-02-28 Pompe électromagnetique Expired - Lifetime EP1236894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI010419 2001-03-01
IT2001MI000419A ITMI20010419A1 (it) 2001-03-01 2001-03-01 Pompa comandata da elettromagnete

Publications (2)

Publication Number Publication Date
EP1236894A1 EP1236894A1 (fr) 2002-09-04
EP1236894B1 true EP1236894B1 (fr) 2006-06-28

Family

ID=11447068

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020004696 Expired - Lifetime EP1236894B1 (fr) 2001-03-01 2002-02-28 Pompe électromagnetique

Country Status (4)

Country Link
EP (1) EP1236894B1 (fr)
DE (1) DE60212742T2 (fr)
ES (1) ES2263699T3 (fr)
IT (1) ITMI20010419A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8586886B2 (en) 2009-06-23 2013-11-19 Black & Decker Inc. Switch mechanism for a power cutter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101275543B (zh) * 2007-03-27 2012-02-29 德昌电机股份有限公司 电磁泵
GB2450719A (en) 2007-07-04 2009-01-07 Black & Decker Inc Power cutter with engine controller and sensor means
GB0812274D0 (en) 2008-07-04 2008-08-13 Black & Decker Inc Switch mechanism for a power cutter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1299987B1 (it) * 1998-04-27 2000-04-04 Magneti Marelli Spa Pompa volumetrica.
JP4203160B2 (ja) * 1998-11-13 2008-12-24 株式会社ミクニ 電磁ポンプ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8586886B2 (en) 2009-06-23 2013-11-19 Black & Decker Inc. Switch mechanism for a power cutter

Also Published As

Publication number Publication date
ES2263699T3 (es) 2006-12-16
DE60212742T2 (de) 2007-06-28
ITMI20010419A1 (it) 2002-09-01
EP1236894A1 (fr) 2002-09-04
DE60212742D1 (de) 2006-08-10

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