WO2012163576A1 - Pompe d'alimentation en carburant, de préférence du carburant diesel, à un moteur à combustion interne - Google Patents

Pompe d'alimentation en carburant, de préférence du carburant diesel, à un moteur à combustion interne Download PDF

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Publication number
WO2012163576A1
WO2012163576A1 PCT/EP2012/056068 EP2012056068W WO2012163576A1 WO 2012163576 A1 WO2012163576 A1 WO 2012163576A1 EP 2012056068 W EP2012056068 W EP 2012056068W WO 2012163576 A1 WO2012163576 A1 WO 2012163576A1
Authority
WO
WIPO (PCT)
Prior art keywords
annular element
pump unit
unit according
piston
cylinder
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.)
Ceased
Application number
PCT/EP2012/056068
Other languages
English (en)
Inventor
Massimiliano Roncone
Gaetano Riglietti
Giovanni Gorgone
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2012163576A1 publication Critical patent/WO2012163576A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • F02M59/445—Selection of particular materials
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam

Definitions

  • the present invention relates to a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine.
  • the present invention relates to a pump unit of the type comprising a pump housing, at least one cylinder formed in the pump housing; a piston which is engaged slidably in the cylinder and has a narrower portion and a wider portion interconnected at a shoulder which is positioned perpendicularly to a longitudinal axis of the cylinder; first actuator means for moving the piston through a stroke for the intake of fuel into the cylinder; and second actuator means for moving the piston through a stroke for the compression of the fuel contained in the cylinder.
  • the second actuator means comprise a cam, formed on an outer surface of a transmission shaft extending through the pump housing transversely with respect to the longitudinal axis of the cylinder, and a cam follower, which is positioned between the cam and the wider portion of the piston and which is provided with a cam follower roller positioned in contact with the cam.
  • the cam follower roller projects from a sleeve which extends around the cylinder, is coupled slidably to the pump housing, and has a flange projecting radially inwards from the sleeve so as to separate a first portion of the sleeve, adapted to receive and retain the cam follower by a positive fit, from a second portion.
  • the first actuator means comprise an annular support element, which is fitted into the second portion of the sleeve, extends around the narrower portion of the piston, and axially faces the flange of the sleeve and the shoulder of the piston, and a cylindrical spring, which is mounted between the cylinder and the sleeve coaxi- ally with the longitudinal axis of the cylinder, and is interposed between the pump housing and the annular support element so as to hold the annular support element axially against the flange and hold the cam follower against the cam.
  • the wider portion of the piston normally has an axial length which is smaller than the distance between the annular support element and the cam follower, the inertial forces acting on the piston cause the piston to move axially with respect to both the annular support element and the cam follower, and cause the piston to strike against the cam follower at the end of the intake stroke and against the annular support element at the end of the compression stroke.
  • the known pump units of the type described above have a number of drawbacks, mainly due to the fact that the striking of the piston against the annular support element and against the cam follower gives rise to troublesome noise and also causes the deformation of the annular support element, which is detrimental to its correct operation.
  • the object of the present invention is to provide a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine which is free of the drawbacks described above and which is simple and economical to produce.
  • a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine, as claimed in the appended claims.
  • Figure 1 is a first schematic sectional view, with parts removed for clarity, of a preferred embodiment of the pump unit according to the present invention
  • Figure 2 is a second schematic sectional view, with parts removed for clarity, of the pump unit of Figure 1;
  • Figure 3 is a schematic sectional view of a detail of Figures 1 and 2.
  • the number 1 indicates, as a whole, a pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine (not shown).
  • fuel preferably diesel oil
  • the pump unit 1 comprises a pump housing 2 provided with a central bore 3 having a specified longitudinal axis 4; a piston pump 5 for supplying the fuel to the aforesaid internal combustion engine (not shown); and a pre-feed pump of a known type (not shown) for supplying the fuel to the pump 5.
  • the pump 5 comprises at least one cylinder 6, which is formed in the pump housing 2, has a longitudinal axis 7 positioned substantially perpendicularly to the axis 4, faces the bore 3, and interacts with a valve 8 for the intake of fuel into the cylinder 6 and with a valve 9 for delivering the fuel to the internal combustion engine (not shown).
  • the cylinder 6 is engaged slidably by a piston 10, which is mounted inside the cylinder 6 coaxially with the axis 7, and comprises a wider end portion 11 and a narrower intermediate portion 12, these portions being interconnected at an annular shoulder 13 which is substantially perpendicular and coaxial with the axis 7.
  • the piston 10 is moved by an actuating device 14 along the cylinder 6 with a reciprocating rectilinear motion including a stroke for the intake of fuel into the cylinder 6 and a stroke for the compression of the fuel contained in the cylinder 6.
  • the device 14 comprises a tubular sleeve 15, which is engaged slidably in a cylinder 16 formed in the pump housing 2 coaxially with the axis 7, extends around the cylinder 6, and has an annular flange 17 which projects radially into the sleeve 15 and divides the sleeve 15 into two cylindrical portions 18, 19, of which the portion 18 faces the bore 3.
  • the device 14 also has a cam follower 20 comprising a coupling block 21 of substantially cylindrical shape, which is fitted inside the portion 18, is positioned in contact with the flange 17, and is locked by interference in the portion 18, and a cam follower roller 22 which projects from the block 21 towards the bore 3 and is coupled rotatably to the block 21 so that it can rotate with respect to the block 21 about its own longitudinal axis 23 which is substantially perpendicular to the axis 7.
  • the flange 17 supports an annular element 24, which extends around the narrower portion 12 of the piston 10, is fitted into the portion 19 of the sleeve 15 coaxially with the axis 7, has an outer perimetric edge facing the flange 17 axially, also has an inner perimetric edge facing the shoulder 13 axially, and is limited axially by two flat faces 25, 26 which are substantially parallel to each other and perpendicular to the axis 7, with the face 25 facing the cam follower 20.
  • Each face 25, 26 has, on its inner perimetric edge, an annular coating 27, 28, which is substantially coaxial with the axis 7 and which is preferably, but not necessarily, made from a resiliently deformable material, in the present case an elas- tomeric material deposited by curing on the face 25, 26.
  • the device 14 comprises a cylindrical spring 29, which is mounted between the cylinder 6 and the sleeve 15 coaxially with the axis 7, and is interposed between the pump housing 2 and the element 24 in such a way that it brings the element 24 into contact with the flange 17 and normally keeps it there, brings the coating 27 of the face 25 into contact with the shoulder 13 and normally keeps it there, brings the piston 10 into contact with the block 21 and normally keeps it there, and brings the roller 22 into contact with a cam 30 and normally keeps it there, the cam 30 being formed on an outer surface of an intermediate portion of a transmission shaft 31 which is mounted through the bore 3 so as to rotate, with respect to the pump housing 2, about the axis 4.
  • the thickness of the coating 27, measured parallel to the axis 7, is at least equal to the difference between the distance of the face 25 from the block 21 and the thickness of the wider portion 11 of the piston 10, also measured parallel to the axis 7, the coating 27 prevents the portion 11 from striking the block 21 and the element 24, and from deforming the element 24 to the detriment of its correct operation.
  • the presence of the two coatings 27, 28 enables the personnel responsible for assembling the pump unit 1 to fit the element 24 correctly in the portion 19 of the sleeve 15, regardless of the position of the faces 25, 26.
  • the coatings 27, 28 can extend continuously around the inner perimetric edges of the corresponding faces 25, 26, or can comprise a plurality of portions of elastomeric material distributed around the inner perimetric edges of the corresponding faces 25, 26 so as to form, in combination, an annular element for filling the space present between the shoulder 13 and the element 24.
  • the coatings 27, 28 are dispensed with and replaced with a ring, preferably a ring of elastomeric material, which is interposed between the shoulder 13 and the element 24, is made as a separate piece distinct from the element 24, and is axially locked between the shoulder 13 and the element 24 by the spring 29.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une pompe d'alimentation en carburant, de préférence du carburant diesel, à un moteur à combustion interne, pompe ayant un piston (10), qui est mis en prise de manière coulissante dans un cylindre (6) formé dans un corps de pompe (2), qui est déplacé tout au long d'une course pour l'admission du carburant dans le cylindre (6) par un premier élément annulaire (24) s'étendant autour d'une partie plus étroite (12) du piston (10), et est positionné en contact avec un épaulement (13) du piston (10) au moyen de l'interposition d'un second élément annulaire (27).
PCT/EP2012/056068 2011-05-30 2012-04-03 Pompe d'alimentation en carburant, de préférence du carburant diesel, à un moteur à combustion interne Ceased WO2012163576A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2011A000976 2011-05-30
IT000976A ITMI20110976A1 (it) 2011-05-30 2011-05-30 Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna

Publications (1)

Publication Number Publication Date
WO2012163576A1 true WO2012163576A1 (fr) 2012-12-06

Family

ID=44898729

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/056068 Ceased WO2012163576A1 (fr) 2011-05-30 2012-04-03 Pompe d'alimentation en carburant, de préférence du carburant diesel, à un moteur à combustion interne

Country Status (2)

Country Link
IT (1) ITMI20110976A1 (fr)
WO (1) WO2012163576A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130500A1 (it) * 2013-04-02 2014-10-03 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
ITMI20131164A1 (it) * 2013-07-10 2015-01-11 Bosch Gmbh Robert Gruppo pompa per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
IT201600115346A1 (it) * 2016-11-15 2018-05-15 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851120A2 (fr) * 1996-12-23 1998-07-01 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Pompe à pistons, en particulier pompe à pistons radiaux pour carburant de moteur à combustion interne
EP1519033A2 (fr) * 2003-09-25 2005-03-30 Robert Bosch Gmbh Pompe à piston, notamment pompe haute pression à piston
DE102009027689A1 (de) * 2009-07-14 2011-01-20 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851120A2 (fr) * 1996-12-23 1998-07-01 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Pompe à pistons, en particulier pompe à pistons radiaux pour carburant de moteur à combustion interne
EP1519033A2 (fr) * 2003-09-25 2005-03-30 Robert Bosch Gmbh Pompe à piston, notamment pompe haute pression à piston
DE102009027689A1 (de) * 2009-07-14 2011-01-20 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130500A1 (it) * 2013-04-02 2014-10-03 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
ITMI20131164A1 (it) * 2013-07-10 2015-01-11 Bosch Gmbh Robert Gruppo pompa per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
WO2015004151A1 (fr) * 2013-07-10 2015-01-15 Robert Bosch Gmbh Ensemble pompe d'alimentation en carburant, de préférence en carburant diesel, d'un moteur à combustion interne
US10352283B2 (en) 2013-07-10 2019-07-16 Robert Bosch Gmbh Internal combustion engine fuel, preferably diesel fuel, feed pump assembly
IT201600115346A1 (it) * 2016-11-15 2018-05-15 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna

Also Published As

Publication number Publication date
ITMI20110976A1 (it) 2012-12-01

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