WO2018122007A1 - Groupe de pompage pour l'alimentation en carburant, de préférence en diesel, d'un moteur à combustion interne - Google Patents

Groupe de pompage pour l'alimentation en carburant, de préférence en diesel, d'un moteur à combustion interne Download PDF

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Publication number
WO2018122007A1
WO2018122007A1 PCT/EP2017/083029 EP2017083029W WO2018122007A1 WO 2018122007 A1 WO2018122007 A1 WO 2018122007A1 EP 2017083029 W EP2017083029 W EP 2017083029W WO 2018122007 A1 WO2018122007 A1 WO 2018122007A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
cylinder
combustion engine
internal combustion
pump unit
Prior art date
Application number
PCT/EP2017/083029
Other languages
German (de)
English (en)
Inventor
Luigi Fiorentino
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 WO2018122007A1 publication Critical patent/WO2018122007A1/fr

Links

Classifications

    • 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
    • F04B1/0421—Cylinders
    • 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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F04B1/0452—Distribution members, e.g. valves
    • 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
    • F04B1/0452—Distribution members, e.g. valves
    • F04B1/0456—Cylindrical
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion

Definitions

  • the present invention relates to a pump set for supplying fuel, preferably diesel, to an internal combustion engine.
  • the present invention relates to a pump assembly of the type comprising a pump body, at least one cylinder formed in the pump body, a piston displaceably disposed in the cylinder, and an actuator for urging the piston in an intake stroke
  • Suction of the fuel into the cylinder and during a compression stroke for compressing the fuel contained in the cylinder to move comprises.
  • the pump assembly further includes a suction line for aspirating the fuel into the cylinder, a suction valve mounted along the suction line to selectively control the supply of the fuel to the cylinder, a pressure line for pushing the fuel to the internal combustion engine, and a pressure valve along the pressure line is attached to the
  • the pressure line is coaxial with a longitudinal axis of the cylinder, and in it is slidably disposed a closure part of the pressure valve.
  • the closure part of the pressure valve is thus axially facing the piston and is movable between an open position and a closed position of the pressure line.
  • the closure member has a substantially spherical coupling portion that is configured to fluidly couple with a substantially frusto-conical coupling portion of the pressure line when the closure member is in its closed position.
  • the known pump units of the above-mentioned type have some disadvantages, mainly due to the fact that during its compression stroke inside the cylinder, the piston generates pressure waves between the closure part of the pressure valve and the piston parallel to the longitudinal axis of the cylinder at least during the initial phase of the cylinder
  • Object of this invention is to provide a pump unit for supplying
  • Fuel preferably diesel, to perform an internal combustion engine, which does not have the disadvantages described above and is simple and inexpensive in the execution.
  • a pump set for supplying fuel, preferably diesel, to an internal combustion engine according to the appended claims.
  • Figure 1 is a first schematic sectional view, with omitted for clarity parts, a preferred embodiment of
  • Figure 2 is a second schematic sectional view, with parts omitted for clarity, of the pump unit of Figure 1;
  • Figure 3 is a schematic sectional view of a detail of the pump unit of Figures 1 and 2;
  • Figure 4 is a schematic sectional view of a first variant of the detail of Figure 3 and
  • FIG. 5 shows a schematic sectional view of a second variant of the detail from FIG. 3.
  • 1 denotes a pump unit for supplying fuel, preferably diesel, to an internal combustion engine (not shown) as a whole.
  • the pump unit 1 comprises a piston pump 2 for supplying the fuel to said internal combustion engine (not shown) and a prefeed pump 3, for example a gear pump, for supplying the fuel to the pump 2.
  • the pump unit 1 comprises a pump body comprising a housing 4 provided with a central bore 5 having a longitudinal axis 6 and at least one lateral bore 7 (normally a plurality of bores 7 extending uniformly about the axis 6) are distributed), which has a longitudinal axis 8 which is transverse to the axis 6 and extending radially from the bore 5 to the outside of the housing 4.
  • Each bore 7 is closed by a head part 9 which is arranged in contact with the housing 4 and has an extension 10 which projects coaxially with the axis 8 into the bore 7.
  • the head portion 9 has a central bore 11 formed through the head portion 9 coaxial with the axis 8 and includes a constricted intermediate portion 12 disposed between two flared portions 13a, 13b, the portion 13a facing the bore 5 and a cylinder 14 of the piston pump 2 defined.
  • a piston 15 is slidably movable under the thrust of an actuator 16 with a rectilinear reciprocating motion comprising a suction stroke for sucking the fuel into the cylinder 14 and a compression stroke for compressing the fuel contained in the cylinder 14 ,
  • the device 16 comprises a tubular sleeve 17 which is slidably disposed in the bore 7 coaxial with the axis 8, extends around the cylinder 14 and has an annular inner flange 18 which protrudes radially from an inner surface of the sleeve 17 and this sleeve 17 in two cylindrical sections 19, 20 divides, wherein the portion 19 of the bore 5 faces.
  • the device 16 further comprises a plunger 21 comprising a substantially cylindrical coupling block 22 which is held by excess in the portion 19, is arranged in contact with the flange 18 and a
  • Plunger roller 23 carries.
  • the roller 23 protrudes from the block 22 to the bore 5 and is rotatably coupled to the block 22 to be in relation to this block 22 by its own
  • the flange 18 carries an annular plate 25 which extends around the piston 15, is inserted into the portion 20 of the sleeve 17 coaxial with the axis 8 and an outer peripheral edge which faces axially the flange 18, and an inner peripheral edge axially facing a bottom of the piston 15.
  • the device 16 further comprises a compression spring 26, which between the
  • Extension 10 and the sleeve 17 is mounted coaxially to the axis 8 and between the head part 9 and the plate 25 is seated to move the plate 25 in contact with the flange 18 and normally hold and the roller 23 in contact with a cam 27 to move and normally hold, which is formed on an outer surface of an intermediate portion of a drive shaft 28 which is mounted through the bore 5 therethrough to rotate with respect to the housing 4 about the axis 6.
  • the head part 9 receives in its interior a suction valve 29 for sucking the fuel into the cylinder 14 and a pressure valve 30 for pushing the fuel to the engine (not shown).
  • the valve 29 is mounted in a suction duct 31 having a longitudinal axis 32 perpendicular to the axis 8, and comprises a cylindrical valve body 33 extending around the axis 32 and axially along the duct 31 through a closure cover 34 inserted in the Line 31 is screwed, is held.
  • the valve 29 further includes a closure member 35 which is mounted through the valve body 33 to move between an open position and a closed position of the valve 29.
  • the closure member 35 is by a spring 36 which is between the valve body 33 and an annular, on
  • Closing part 35 mounted transversely to the axis 32 mounted plate 37, moved to its closed position and normally held there.
  • the valve 30 controls the supply of fuel along a pressure line defined by the head portion 9 through the portions 12 and 13b, and includes a cup-shaped closure member 38 slidably disposed in the portion 13b and between an open position and a second position
  • Closed position of the valve 30 is movable.
  • the closure member 38 is moved by a spring 39, which sits between the closure member 38 and a mounted in the section 13b stop sleeve 40 in its closed position and normally held there.
  • the sections 12, 13b are interconnected by a shoulder substantially parallel to one another
  • frusto-conical coupling portion 41 which is designed so that it is fluid-tight with a substantially spherical
  • Coupling portion 42 of the closure part 38 couples.
  • the portion 12 is further provided with a sawtooth toothing 43 which is formed on an inner wall 44 of the portion 12 and includes a plurality of annular teeth 45 which project inwardly from the wall 44.
  • FIG. 4 differs from the illustration in Figure 3 only in that the sawtooth-shaped toothing 43 has been removed and replaced by an annular tooth 46 which projects inwardly from the wall 44 and a substantially quadrangular, in particular square or rectangular, cross-section.
  • the toothing 43 and the tooth 46 are executed on the inner wall of a sleeve which is inserted into the section 12.
  • the piston 15 During operation, the piston 15 generates pressure waves in the cylinder 14 during its compression stroke.
  • the teeth 43 and the tooth 46 make it possible to break the front of the pressure waves, prevent the pressure bubbles, the coupling portions 41, 42 , or allow the vapor bubbles to reach the coupling portions 41, 42 with a relatively low energy, prevent wear by cavitation of the coupling portions 41, 42 and thereby guarantee proper fluid-tight coupling of the closure member 38 to the head portion 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un groupe de pompage pour l'alimentation en carburant, de préférence en diesel, d'un moteur à combustion interne, ledit groupe comprenant au moins un cylindre (14), un piston (15) monté coulissant dans le cylindre (14) et un clapet de refoulement (30) permettant la commande sélective de l'alimentation en carburant du moteur à combustion interne, le clapet de refoulement (30) comportant une pièce d'obturation (38) qui est montée coulissante dans une partie évasée (13b) d'une conduite de refoulement (12, 13b) qui comporte par ailleurs une partie rétrécie (12) munie d'une denture (43, 46) réalisée sur sa paroi interne (44).
PCT/EP2017/083029 2016-12-28 2017-12-15 Groupe de pompage pour l'alimentation en carburant, de préférence en diesel, d'un moteur à combustion interne WO2018122007A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000131859A IT201600131859A1 (it) 2016-12-28 2016-12-28 Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
IT102016000131859 2016-12-28

Publications (1)

Publication Number Publication Date
WO2018122007A1 true WO2018122007A1 (fr) 2018-07-05

Family

ID=58609912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/083029 WO2018122007A1 (fr) 2016-12-28 2017-12-15 Groupe de pompage pour l'alimentation en carburant, de préférence en diesel, d'un moteur à combustion interne

Country Status (2)

Country Link
IT (1) IT201600131859A1 (fr)
WO (1) WO2018122007A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037465A1 (de) * 1990-10-31 1992-05-07 Daimler Benz Ag Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
WO2010130502A1 (fr) * 2009-05-13 2010-11-18 Robert Bosch Gmbh Unité de soupape pour une pompe à carburant à piston haute pression et pompe comprenant cette unité de soupape
FR2953568A1 (fr) * 2009-12-09 2011-06-10 Bosch Gmbh Robert Pompe a piston comportant un organe d'obturation au niveau de la soupape d'entree
DE102012200708A1 (de) * 2012-01-19 2013-07-25 Robert Bosch Gmbh Hochdruckpumpe und Verfahren zur Verringerung der Kavitationswirkung in einer Hochdruckpumpe
DE102015116677A1 (de) * 2014-11-12 2016-05-12 Denso Corporation Hochdruckpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037465A1 (de) * 1990-10-31 1992-05-07 Daimler Benz Ag Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
WO2010130502A1 (fr) * 2009-05-13 2010-11-18 Robert Bosch Gmbh Unité de soupape pour une pompe à carburant à piston haute pression et pompe comprenant cette unité de soupape
FR2953568A1 (fr) * 2009-12-09 2011-06-10 Bosch Gmbh Robert Pompe a piston comportant un organe d'obturation au niveau de la soupape d'entree
DE102012200708A1 (de) * 2012-01-19 2013-07-25 Robert Bosch Gmbh Hochdruckpumpe und Verfahren zur Verringerung der Kavitationswirkung in einer Hochdruckpumpe
DE102015116677A1 (de) * 2014-11-12 2016-05-12 Denso Corporation Hochdruckpumpe

Also Published As

Publication number Publication date
IT201600131859A1 (it) 2018-06-28

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