WO2018228970A1 - Unité de pompe pour l'alimentation d'un carburant dans un moteur à combustion interne - Google Patents

Unité de pompe pour l'alimentation d'un carburant dans un moteur à combustion interne Download PDF

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Publication number
WO2018228970A1
WO2018228970A1 PCT/EP2018/065284 EP2018065284W WO2018228970A1 WO 2018228970 A1 WO2018228970 A1 WO 2018228970A1 EP 2018065284 W EP2018065284 W EP 2018065284W WO 2018228970 A1 WO2018228970 A1 WO 2018228970A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump unit
chamber
intake
fuel
head
Prior art date
Application number
PCT/EP2018/065284
Other languages
English (en)
Inventor
Michele Antonio IANNUZZI
Jochen Knust
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
Priority to CN201880039666.4A priority Critical patent/CN110770432A/zh
Publication of WO2018228970A1 publication Critical patent/WO2018228970A1/fr

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
    • F02M59/44—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
    • F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
    • 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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • 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
    • F04B53/04—Draining
    • 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

Definitions

  • the present invention relates to a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine comprises a head inside which at least one cylinder for housing the associated sliding pumping piston is formed.
  • One end of the pumping piston, in particular the inner end relative to the pump unit, is connected to an actuator, usually a cam shaft which actuates the movement of the piston.
  • a suitable spring is provided for keeping the shaft pressed against the corresponding actuator.
  • feeding into the cylinder is performed through an intake hole, while discharging of the compressed fuel is performed along a transverse hole, or delivery hole.
  • the external part of the head for receiving the fuel which must be fed to the cylinder is called the intake chamber which is closed externally by a suitable plug, or closure, sealingly fastened to the head.
  • Suitable valves are present along the feed or delivery holes for adjusting the correct flow of the fuel.
  • the delivery valve is connected to the engine, preferably by means of a common header provided with a plurality of injectors.
  • the intake chamber which is connected to the cylinder by means of the intake valve, communicates with an intake duct for feeding the fuel drawn from the fuel tank by means of a low-pressure pump, usually a gear pump.
  • the pump unit also comprises filtering systems, for example ring filters at the inlet of the intake chamber, for protecting the components of the high-pressure pump from the impurities present in the fuel fed by the low-pressure pump.
  • Lubrication of the piston sliding inside the cylinder is ensured by means of the fuel itself which seeps between the piston and the cylinder from the compression chamber as far as the base of the cylinder beyond which the piston interacts with the cam shaft. Since this cam shaft is lubricated by an oil bath, the base of the cylinder must be provided with a seal able to prevent contact between the underlying oil and the seeping fuel which has accumulated at the base of the cylinder.
  • the seeping fuel which has accumulated at the base of the cylinder is again fed to the intake chamber.
  • a special channel is formed in the head and connects the intake chamber to the fuel collection chamber at the base of the cylinder.
  • the first drawback consists in the fact that the temperature of the fuel in the intake chamber is raised as a result of mixing with the hot fuel arriving from the collection chamber at the base of the cylinder. This increase in the temperature inside the intake chamber reduces both the efficiency and the reliability of the head and the seal at the base of the cylinder.
  • the second drawback consists in the fact that the pressure peaks present in the intake chamber are propagated as far as the fuel collection chamber at the base of the cylinder with the direct effect of reducing the recirculating efficiency of the fuel.
  • an increase in the temperature at the base of cylinder occurs with possible damage to the seal and the head.
  • a pump unit for feeding fuel, in particular diesel fuel, to an internal combustion engine is provided.
  • This pump unit comprises:
  • the hot fuel accumulated inside the collection chamber is not discharged into the intake chamber, thus avoiding both overheating inside the intake chamber and transfer of pressure peaks from the intake chamber to the collection chamber.
  • the external discharge channel is configured to discharge the fuel outside the pump unit or inside the pump unit upstream of the intake chamber.
  • FIG. 1 is a schematic cross-sectional view of a portion of a pump unit for feeding fuel to an internal combustion engine according to the present invention
  • - Figure 2 is a schematic cross-sectional view of the plug for closing the intake chamber of the pump unit shown in Figure 1;
  • FIG. 3 is a schematic cross-sectional view of the head of the pump unit shown in Figure 1.
  • Figure 1 shows a schematic cross-sectional view of an example of embodiment of a pump unit according to the present invention for feeding fuel to an internal combustion engine.
  • the pump unit 1 comprises a head 2 inside which a cylinder 3 with an axis A for housing a sliding pumping piston 4 is formed.
  • An intake duct 5 (only partially visible), for feeding the fuel from a tank outside the pump to the cylinder 3, and a delivery duct (not shown), for discharging the compressed fuel from the cylinder 3, are also formed inside the head 2.
  • An actuator device for example a cam shaft, for actuating the reciprocating movement of the piston 4 inside the cylinder 3, is provided at the inner end, or foot, of the piston 4.
  • the piston is pressed by means of a spring 6 against the cam shaft.
  • the cam shaft is lubricated by an oil bath.
  • the cylinder 3 is provided with an axial hole 7 along the axis A for housing an intake valve 8 which connects the compression chamber 10 of the cylinder 3 to an intake chamber 9 situated on the outside of the head 2 and fed with the fuel via the intake duct 5.
  • the intake valve 8 which connects the compression chamber 10 of the cylinder 3 to an intake chamber 9 situated on the outside of the head 2 and fed with the fuel via the intake duct 5.
  • a stem-like closing member on one side projects inside the compression chamber 10 and on the other side projects inside the intake chamber
  • the intake chamber 9 is closed by a plug 11 pressed against the head 2 by a ring nut 12. Both the sealed connection of the plug 11 relative to the head 2 and the connection between the ring nut 12 and the plug 11 are known.
  • the pump unit 1 comprises a seal 13.
  • This seal 13 has the purpose of preventing the downward flow of the fuel which has seeped between the cylinder 3 and piston 4 and therefore defines inside the head 2 a chamber 14 for collecting the seeping fuel.
  • this collection chamber 14 has an annular form with respect to the axis A.
  • an internal discharge channel 15 is formed inside the head 2 and extends from the collection chamber 14 to the intake chamber 9.
  • the fuel fed into the internal discharge channel 15 from the collection chamber 14 is not discharged into the intake chamber 9, but inside an external discharge channel 16 formed inside the plug 11.
  • This external discharge channel 16 therefore extends from the outer surface of the plug 11 in contact with the head 2 into the intake chamber 9 towards the outside of the plug 11.
  • FIG. 2 shows a cross-sectional view of the plug 11 in Figure 1.
  • the external discharge duct 16 comprises two sections, i.e. an upstream section 16' and downstream section 16", with different cross-sections.
  • the upstream section 16' has a smaller cross-section than that of the respective downstream portion 16".
  • the terms "upstream” and “downstream” relate to the flow of the fuel passing through the ducts and schematically indicated by arrows in Figure 1.
  • the downstream portion 16" of the external discharge duct 16 extends into associated sleeve portions which extend parallel to the axis A outside the plug 11, namely from its outer surface 19.
  • the upstream portion 16' of the external discharge duct 16 extends inside the plug 11 and continues into an associated sleeve portion which extends inside the head 2 beyond the usual plane of contact of the plug 11 against the head 11.
  • This plane of contact is schematically indicated in Figure 2 by the reference number 20.
  • the point of contact between the internal channel 15 and external channel 16 is located along the axis A at a height situated more towards the inside of the pump than the inlet of the hole 8 for feeding fuel into the feed chamber.
  • the point of contact between the internal channel 15 and the external channel 16 is located along the axis A at the same height as or in alignment, perpendicular to the axis A, with the compression chamber 10 or with the inner surface of the cylinder 3 of the stem-like intake valve 8.
  • Figure 3 shows a cross-sectional view of the head 2 shown in Figure 1.
  • the head in the region of the intake chamber 9, the head comprises a lowered seat 21 parallel to the axis A and configured to receive the corresponding projection portion of the external discharge duct 16.
  • the side walls of this lowered seat 21 make lateral contact with the sleeve portion projecting from the plug 11 which defines the projecting portions of the external discharge duct 16.

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 une unité de pompe pour l'alimentation d'un carburant, en particulier un carburant diesel, dans un moteur à combustion interne ; l'unité de pompe comprend une tête (2) à l'intérieur de laquelle un cylindre pour loger un piston de pompage coulissant (4) est formée le long d'un axe (A) ; une soupape d'admission (8) positionnée à l'intérieur d'un trou d'admission entre une chambre d'admission (9) et une chambre de compression (10) respectivement en amont et en aval du trou d'admission ; un obturateur (11) pressé contre la tête (2) dans la région de la soupape d'admission pour fermer la chambre d'admission ; un canal d'évacuation interne (15) formé dans la tête et relié à une extrémité à une chambre (14) pour collecter le carburant qui s'infiltre le long du cylindre et à l'autre extrémité à un canal d'évacuation externe (16) formé dans l'obturateur (11).
PCT/EP2018/065284 2017-06-13 2018-06-11 Unité de pompe pour l'alimentation d'un carburant dans un moteur à combustion interne WO2018228970A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201880039666.4A CN110770432A (zh) 2017-06-13 2018-06-11 用于向内燃机供给燃料的泵单元

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000065540A IT201700065540A1 (it) 2017-06-13 2017-06-13 Gruppo pompa per l'alimentazione di combustibile ad un motore a combustione interna
IT102017000065540 2017-06-13

Publications (1)

Publication Number Publication Date
WO2018228970A1 true WO2018228970A1 (fr) 2018-12-20

Family

ID=60138790

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/065284 WO2018228970A1 (fr) 2017-06-13 2018-06-11 Unité de pompe pour l'alimentation d'un carburant dans un moteur à combustion interne

Country Status (3)

Country Link
CN (1) CN110770432A (fr)
IT (1) IT201700065540A1 (fr)
WO (1) WO2018228970A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB690563A (en) * 1950-06-14 1953-04-22 Cav Ltd Liquid fuel pumps
DE102012204264A1 (de) * 2012-03-19 2013-09-19 Robert Bosch Gmbh Hochdruckpumpe
DE102013203891A1 (de) * 2013-03-07 2014-09-11 Robert Bosch Gmbh Hochdruckpumpe, insbesondere Kraftstoffhochdruckpumpe für eine Brennkraftmaschine
WO2015082112A1 (fr) * 2013-12-04 2015-06-11 Robert Bosch Gmbh Pompe pour transporter un fluide
DE102014218992A1 (de) * 2014-09-22 2016-03-24 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB690563A (en) * 1950-06-14 1953-04-22 Cav Ltd Liquid fuel pumps
DE102012204264A1 (de) * 2012-03-19 2013-09-19 Robert Bosch Gmbh Hochdruckpumpe
DE102013203891A1 (de) * 2013-03-07 2014-09-11 Robert Bosch Gmbh Hochdruckpumpe, insbesondere Kraftstoffhochdruckpumpe für eine Brennkraftmaschine
WO2015082112A1 (fr) * 2013-12-04 2015-06-11 Robert Bosch Gmbh Pompe pour transporter un fluide
DE102014218992A1 (de) * 2014-09-22 2016-03-24 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Also Published As

Publication number Publication date
IT201700065540A1 (it) 2018-12-13
CN110770432A (zh) 2020-02-07

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