WO2019101493A1 - Pompe haute pression dotée d'une protection de joint d'étanchéité de piston - Google Patents

Pompe haute pression dotée d'une protection de joint d'étanchéité de piston Download PDF

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Publication number
WO2019101493A1
WO2019101493A1 PCT/EP2018/080005 EP2018080005W WO2019101493A1 WO 2019101493 A1 WO2019101493 A1 WO 2019101493A1 EP 2018080005 W EP2018080005 W EP 2018080005W WO 2019101493 A1 WO2019101493 A1 WO 2019101493A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
pumping chamber
plunger
head cap
seal
Prior art date
Application number
PCT/EP2018/080005
Other languages
English (en)
Inventor
Abdul Aziz
Paul Buckley
Kartik Rajaram
Original Assignee
Delphi Technologies Ip Limited
Delphi France Sas
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 Delphi Technologies Ip Limited, Delphi France Sas filed Critical Delphi Technologies Ip Limited
Publication of WO2019101493A1 publication Critical patent/WO2019101493A1/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
    • 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
    • F02M59/025—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 a single piston
    • 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
    • F02M55/004—Joints; Sealings
    • 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
    • F02M59/022—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 having an accumulator storing pressurised fuel during pumping stroke of the piston for subsequent delivery to the injector
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • 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
    • 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
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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

Definitions

  • This invention relates to high pressure fuel pumps which include an e.g. cam driven plunger, adapted to reciprocate within a pumping chamber in order to pressurise fuel, and which include a plunger seal.
  • an e.g. cam driven plunger adapted to reciprocate within a pumping chamber in order to pressurise fuel, and which include a plunger seal.
  • Fuel flow into a pressurizing chamber of a piston (plunger) type pump is typically controlled by an inlet metering valve (IMV).
  • IMV inlet metering valve
  • an inlet valve is also located integral with the pump (on the head cap thereof) such that fuel can pass into the pumping chamber where there is a pressure differential between the outlet of the IMV (inlet to the pump) and the pressurization chamber, of about 1.5 bar.
  • the fuel is subsequently pressurized by such a plunger or piston, (typically cam driven) before the pressurized fuel is outlet, e.g. via a common rail, to fuel injection equipment.
  • the outlet of fuel from the chamber may take place via outlet valve.
  • a plunger seal is provided.
  • a seal return line is e.g. provide by a bore of drilling thus this providing a conduit for leakage flow back to the head cap space.
  • a problem identified by the inventors is pressure fluctuation in the paths between the IMV and the Inlet valve (e.g. in the head cap space) and in particular pressure spikes can lead to wear of the seal.
  • a high pressure fuel pump including a low pressure fuel inlet adapted to allow fuel flow into a head cap volume, and a pumping chamber fluidly connected to said head cap volume via an inlet valve, arranged to allow fuel flow from said head cap volume into said pumping chamber, and a plunger adapted to reciprocate within said pumping chamber to pressurize fuel, said pumping chamber including an outlet valve; and further including a circumferentially arranged plunger seal adapted to prevent leakage flow of fuel between the plunger and the pump housing portion forming the pumping chamber, and out of the pumping chamber, and including a seal backflow conduit arranged to provide a back flow of said fuel leakage from seal region to said head cap space, characterised where said seal backflow conduit includes a damping restriction.
  • Said damping restriction may comprise a portion of the back flow conduit having a reduced cross sectional area.
  • the back flow conduit may have an outlet to the head cap space and the damping restriction is formed at or adjacent to the outlet.
  • the damping restriction may be provided as an insert.
  • the plunger seal may be located within the pump housing portion forming the pumping chamber, and surrounding a portion of said plunger.
  • FIG. 1 shows a partial sectional view of a prior art high pressure fuel pump
  • Figure 2 shows a partial sectional view of a high pressure fuel pump according to one example. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Figure 1 shows a schematic view showing a cross section through the top portion of a high pressure fuel pump 1.
  • Fuel is pressurised by way of a plunger (or piston) 2 which is driven by a cam (not shown), adapted to pressurise fuel which enters into a pressurisation chamber 3.
  • the plunger is adapted to reciprocate up and down within the pressurisation chamber formed from the pump housing 4, so as to draw fuel in on the down stroke and pressurise the fuel on the upstroke.
  • Fuel is drawn into the pump via an inlet 7 to a head cap space/area 6.
  • the inlet may be downstream of an inlet metering valve.
  • the fuel flowing into the head cap area from the inlet 7 is shown by arrow A.
  • An inlet valve 8 is arranged so as to provide a flow path of fuel from the head cap space to the pumping chamber when there is a pressure differential there between of about 1.5 bar. A higher pressure differential opens the inlet valve.
  • the plunger moves upwards. In the figure the plunger is shown at the top dead centre position. Pressurised fuel leaved the pressure chamber via outlet valve 9.
  • a plunger leakage seal 10 is provided around the plunger and formed in the pumping chamber. This prevents fuel enters the cam box and without this, risks fuel leaking to the engine oil thus diluting the engine oil.
  • seal return line 11 which is effectively a conduit such as a bore to allow fuel flow back to the header cap volume/space.
  • the inventor has identified that in operation of the fuel pump the pressure in the head cap volume/area is subject to pressure fluctuations which includes pressure spikes. Such pressure spikes can lead to damage and wear of the seal.
  • a damping orifice into seal return line is provided.
  • Figure 2 shows an example of the invention which is similar to figure 1 with identical components having the same reference numerals.
  • the design is basically the same as in figure 2 except there is included a damping restriction/orifice 12 in the seal return line (conduit or bore).
  • conduit or bore includes a portion which has a substantially narrower cross section or diameter. This provides the requisite damping with regard to the pressure oscillations in the head cap space affecting the seal.
  • the damping orifice/restriction in the example is adjacent the head space and open to it but the restrictor or damping orifice may be located anywhere in the seal return line.
  • the damping restriction may be provided by an insert.

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

La présente invention concerne une pompe à carburant haute pression comprenant une entrée de carburant basse pression conçue pour permettre un écoulement de carburant dans un volume de capuchon de tête, et une chambre de pompage raccordée fluidiquement audit volume de capuchon de tête par l'intermédiaire d'une soupape d'entrée, agencée pour permettre un écoulement de carburant à partir dudit volume de capuchon de tête dans ladite chambre de pompage, et un piston conçu pour effectuer un mouvement de va-et-vient à l'intérieur de ladite chambre de pompage pour mettre sous pression du carburant, ladite chambre de pompage comprenant une soupape de sortie ; et comprenant en outre un joint d'étanchéité de piston agencé de manière circonférentielle conçu pour empêcher un écoulement de fuite de carburant entre le piston et la partie boîtier de pompe formant la chambre de pompage, et hors de la chambre de pompage, et comprenant un conduit de retour d'étanchéité agencé pour fournir un flux de retour de ladite fuite de carburant de la région d'étanchéité audit espace de capuchon de tête, l'invention étant caractérisée en ce que ledit conduit de retour d'étanchéité comprend une restriction d'amortissement.
PCT/EP2018/080005 2017-11-21 2018-11-02 Pompe haute pression dotée d'une protection de joint d'étanchéité de piston WO2019101493A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1719284.0A GB2568542A (en) 2017-11-21 2017-11-21 High pressure pump with plunger seal protection
GB1719284.0 2017-11-21

Publications (1)

Publication Number Publication Date
WO2019101493A1 true WO2019101493A1 (fr) 2019-05-31

Family

ID=60805800

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/080005 WO2019101493A1 (fr) 2017-11-21 2018-11-02 Pompe haute pression dotée d'une protection de joint d'étanchéité de piston

Country Status (2)

Country Link
GB (1) GB2568542A (fr)
WO (1) WO2019101493A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022218635A1 (fr) * 2021-04-14 2022-10-20 Robert Bosch Gmbh Pompe à haute pression pour système d'injection de carburant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1707799A1 (fr) * 2005-03-30 2006-10-04 Denso Corporation Pompe de carburant à plongeur et système d'alimentation en carburant utilisant la même
DE102011007781A1 (de) * 2011-04-20 2012-10-25 Continental Automotive Gmbh Steckpumpe
WO2015055332A1 (fr) * 2013-10-14 2015-04-23 Continental Automotive Gmbh Pompe haute pression

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013215956A1 (de) * 2013-08-13 2015-02-19 Continental Automotive Gmbh Hochdruckpumpe
JP6406195B2 (ja) * 2015-09-18 2018-10-17 株式会社デンソー ポンプ
CN107917028B (zh) * 2016-10-10 2022-01-18 罗伯特·博世有限公司 柱塞式高压泵及其高压组件、柱塞套

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1707799A1 (fr) * 2005-03-30 2006-10-04 Denso Corporation Pompe de carburant à plongeur et système d'alimentation en carburant utilisant la même
DE102011007781A1 (de) * 2011-04-20 2012-10-25 Continental Automotive Gmbh Steckpumpe
WO2015055332A1 (fr) * 2013-10-14 2015-04-23 Continental Automotive Gmbh Pompe haute pression

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022218635A1 (fr) * 2021-04-14 2022-10-20 Robert Bosch Gmbh Pompe à haute pression pour système d'injection de carburant

Also Published As

Publication number Publication date
GB201719284D0 (en) 2018-01-03
GB2568542A (en) 2019-05-22

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