EP1857667B1 - Pompe de carburant à haute pression - Google Patents

Pompe de carburant à haute pression Download PDF

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Publication number
EP1857667B1
EP1857667B1 EP06425338A EP06425338A EP1857667B1 EP 1857667 B1 EP1857667 B1 EP 1857667B1 EP 06425338 A EP06425338 A EP 06425338A EP 06425338 A EP06425338 A EP 06425338A EP 1857667 B1 EP1857667 B1 EP 1857667B1
Authority
EP
European Patent Office
Prior art keywords
shutter
sleeve
pump according
valve seat
fastening member
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.)
Not-in-force
Application number
EP06425338A
Other languages
German (de)
English (en)
Other versions
EP1857667A1 (fr
Inventor
Pantaleo Sasso
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.)
Centro Studi Componenti per Veicoli SpA
Original Assignee
Centro Studi Componenti per Veicoli 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 Centro Studi Componenti per Veicoli SpA filed Critical Centro Studi Componenti per Veicoli SpA
Priority to AT06425338T priority Critical patent/ATE451548T1/de
Priority to DE602006010981T priority patent/DE602006010981D1/de
Priority to EP06425338A priority patent/EP1857667B1/fr
Publication of EP1857667A1 publication Critical patent/EP1857667A1/fr
Application granted granted Critical
Publication of EP1857667B1 publication Critical patent/EP1857667B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves

Definitions

  • the present invention relates to a high-pressure fuel pump for an internal combustion diesel engine.
  • the present invention relates to a high-pressure fuel piston pump for feeding fuel to a common rail of an internal combustion diesel engine.
  • a high-pressure fuel pump of this type generally comprises a pump housing; a fuel delivery duct; and a delivery valve, which extends along a longitudinal axis along the delivery duct, and comprises a valve seat directly machined in the pump housing; a shutter movable between a closed and an open position in the valve seat; a fastening member suitable for being fastened to the pump housing, and a helical spring suitable for biasing the shutter in the closed position.
  • the helical spring is cyclically compressed between the fastening member and the shutter along the above-identified longitudinal axis and cyclically abuts the shutter against a given portion of the valve seat for closing the delivery valve.
  • the delivery valve allows the fuel flowing along the delivery duct when the fuel pressure in the delivery duct upstream of the delivery valve reaches a level capable of exerting a force on the shutter higher than the sum of the force exerted by the fuel pressure within the delivery duct downstream of the delivery valve and of the force of the helical spring acting on the shutter.
  • the delivery valve opens and closes at each stroke of the piston.
  • the shutter is generally made of hard material and the high number of shocks wears out the portion of valve seat in abutment with the shutter.
  • valve seat Since the valve seat is directly machined in the pump housing, when the portion of valve seat is irreparably worn out the entire high-pressure fuel pump has to be replaced.
  • a know type of valve used in an fuel injector is disclosed in document GB 521,060 , however this type of valve is unsuitable to operate in a high-pressure valve.
  • a high-pressure fuel pump comprising a pump housing; a fuel delivery duct; and a fuel delivery valve, which extends along a longitudinal axis, is arranged along the delivery duct, and comprises a valve seat directly machined in the pump housing; a shutter movable between a closed and an open position in the valve seat; a fastening member suitable for being fastened to the pump housing; a helical spring suitable for biasing the shutter in the closed position; and a sleeve, which is fitted to the fastening member and comprises a sealing ring, which defines a fuel passage and an abutment for said shutter so as to allow the shutter closing the fuel passage;
  • the high-pressure fuel pump being characterised in that the sealing ring is coupled to the valve seat in fluidthight manner and the fastening member comprises a bolt threaded into the valve seat; a first protrusion force fitted into the sleeve and a second protrusion force fitted into the helical spring.
  • the shutter does not come into contact with the valve seat so that the pump housing is prevented from being worn out and/or damaged by the shutter.
  • the fastening member, the shutter, the helical spring, and the sleeve can be assembled together to form a valve assembly, before inserting the valve assembly in to the valve seat and positioning correctly the sealing ring .
  • the assembling steps of the high-pressure fuel pump are simplified.
  • reference numeral 1 indicates as a whole a high-pressure fuel pump suitable for receiving fuel from a low pressure pump (not shown) and for compressing the fuel to pressures higher than 2200 bars for feeding the fuel itself to a common rail of an internal combustion diesel-engine (not shown) in the enclosed figure.
  • Pump 1 comprises a pump housing 2 essentially made of a block of metallic material, in which there are machined a cylinder (not shown), a fuel feeding duct (not shown) to the cylinder, a fuel delivery duct 3; and a delivery valve 4 arranged along the delivery duct 3.
  • the delivery duct 3 is directly machined in the pump housing 2 and comprises a hole 5 upstream of the valve 4; and a hole 6 downstream of the valve 4.
  • the valve 4 comprises a seat 7 directly machined in the pump housing 2 between hole 5 and hole 6.
  • Hole 5 and seat 7 extend in sequence about a longitudinal axis A, while hole 6 extends radially with respect to the longitudinal axis A and departs from seat 7.
  • Seat 7 is delimited by a hole 8 larger than hole 5 and coaxial with hole 5; a truncated cone-shaped face 9 converging towards hole 5; a curved surface 10 flowing into a shoulder 11 perpendicular to the longitudinal axis A, and a further truncated cone-shaped face 12 bridging the shoulder 11 to hole 5 and converging towards hole 5.
  • the seat 7 can be accessed from the outside of the pump housing 2 through a further hole 13, which is larger than hole 8 and is adjacent to an outer face of the pump housing 2.
  • Hole 13 is provided with an inner thread and is closed by a threaded bolt 15 in fluid-tight manner.
  • Bolt 15 comprises a portion suitable to abut against shoulder 14 and securing tightness.
  • the valve 4 comprises in addition to seat 7, a fastening member 16; a shutter 17; a helical spring 18 compressed between the fastening member 16 and shutter 17; and sleeve 19, which is fitted to the fastening member 16 and houses the shutter 17 and the helical spring 18.
  • Fastening member 16, shutter 17, helical spring 18, and sleeve 19 are housed in the seat 7 and are arranged along longitudinal axis A.
  • the fastening member 16 comprises a bolt 20, which is provided with an outer thread for engaging a threaded portion of hole 8; a protrusion 21 extending along longitudinal axis A from bolt 20; and a further protrusion 22, which extends along longitudinal axis A from protrusion 21.
  • Helical spring 18 is force fitted about protrusion 22, whereas sleeve 19 is force fitted about protrusion 21.
  • Fastening member 16 is provided with a through hole 23 extending along longitudinal axis A and aligned with longitudinal axis A.
  • shutter 17 is spear-shaped and is provided with a cone-shaped sealing member 24 flowing into a cylindrical portion 25 and a shank 26, which is force fitted in the helical spring 18.
  • the shank 26 is further provided with a blind hole 27 protruding inside the sealing member 25 to reduce the inertial mass of the shutter 17.
  • the shutter is ball-shaped.
  • Helical spring 18 comprises a number of turns 28 having a constant diameter and distributed with a constant pitch along longitudinal axis A.
  • Sleeve 19 comprises a cylindrical wall 29 arranged about longitudinal axis A and a sealing ring 30 defining a free edge of the cylindrical wall 29 (of the sleeve 19).
  • the cylindrical wall 29 is force fitted about the protrusion 21 of the fastening member 16 and the sealing ring 30 is located on the side opposite to the fastening member 16.
  • the sealing ring 30 is coupled to the valve seat 7 in fluid-tight manner.
  • the sealing ring 30 is forced against shoulder 11 by threadeadly engaging bolt 20 into hole 8.
  • Sealing ring 30 is provided with an outer sealing surface 31 matching with the curved surface 10 of the valve seat 7 and an inner sealing surface 32 matching with the shape of sealing member 24 of the shutter 17 when the shutter 17 is in the closed position.
  • Cylindrical wall 29 is spaced apart from hole 8 (the outer diameter of the wall 29 is smaller than the diameter of hole 8) so that an annular chamber is formed between the cylindrical wall 29 and the seat 7.
  • the cylindrical wall 29 is provided with a number of openings 33 in close proximity to sealing ring 30 so that displacement of the shutter 17 let the fuel flowing from a central passage of the sealing ring 30 to the openings 33 into the annular chamber and, then, into hole 6.
  • the cylindrical wall 29 is further provided with a number of further openings 34 arranged circumferentially in the middle of the cylindrical wall 29 so as to avoid that fuel dwelling inside the sleeve 19 disturbs the displacement of the shutter 17.
  • the inner diameter of the sleeve 19 and the outer diameter of the cylindrical portion 25 of the shutter 17 are selected so that the sleeve 19 guides the displacement of the shutter 17 along longitudinal axis A and avoids lateral displacement of the shutter 17 and any misalignment of the shutter 17 with respect to longitudinal axis A.
  • the shutter 17 and the sleeve 19 are slindingly coupled along longitudinal axis A.
  • shutter 17 does not come into contact with the valve seat 7 so that the pump housing 2 is prevented from being worn out and/or damaged by the shutter 17; the fastening member 16, the shutter 17, the helical spring 18 and the sleeve 19 can be assembled so as to form the valve assembly 35 before inserting it into the valve seat 7 so simplifying the assembling steps; and, should some part of the valve assembly 35 be worn out or damaged during use, the valve assembly 35 can be easily and conveniently be replaced by a new assembly 35 without calling for the replacement of the high-pressure fuel pump 1.

Landscapes

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

Claims (12)

  1. Pompe à carburant à haute pression (1) comprenant un carter de pompe (2) ; une conduite d'alimentation en carburant (3) ; et un robinet d'alimentation en carburant (4), s'étendant le long d'un axe longitudinal (A), est agencé le long de la conduite d'alimentation (3) et comprend un siège de robinet (7) usiné directement dans le carter de pompe (2) ; un volet (17) pouvant se déplacer entre une position fermée et une position ouverte dans le siège de robinet (7) ; un élément de fixation (16) adapté pour être fixé au carter de pompe (2) ; un ressort hélicoïdal (18) adapté pour incliner le volet (17) dans la position fermée ; et un manchon (19), installé sur l'élément de fixation (16) et comprenant un anneau d'étanchéité (30), qui définit un passage de carburant et un aboutement pour ledit volet (17) de manière à permettre au volet (17) de fermer le passage de carburant ; la pompe à carburant à haute pression étant caractérisée en ce que l'anneau d'étanchéité (30) est couplé au siège de robinet de manière étanche aux fluides et l'élément de fixation (16) comprend un boulon (20) fileté dans le siège de robinet (7) ; une première saillie (21) installée par ajustement serré dans le manchon (19) et une seconde saillie (22) installée par ajustement serré dans le ressort hélicoïdal (18).
  2. Pompe selon la revendication 1, caractérisée en ce que ledit manchon (19) reçoit ledit volet (17) et ledit ressort (18).
  3. Pompe selon la revendication 2, caractérisée en ce que ledit manchon (19) est installé par ajustement serré sur l'élément de fixation (16).
  4. Pompe selon la revendication 3, caractérisée en ce que ledit ressort hélicoïdal (18) est installé par ajustement serré sur l'élément de fixation (16).
  5. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que le manchon (19) comporte un premier nombre d'ouvertures (33) agencées à proximité immédiate dudit anneau d'étanchéité (30) pour laisser le carburant s'écoulant à travers le passage pour carburant dudit anneau d'étanchéité (30) s'écouler vers l'extérieur du manchon (19) lorsque le robinet (4) est ouvert.
  6. Pompe selon la revendication 5, caractérisée en ce que le manchon (19) comporte un second nombre d'ouvertures (34) situées au milieu du manchon (19) le long de l'axe longitudinal (A).
  7. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que le manchon (19) et le volet (17) sont couplés de manière coulissante de façon à ce que le manchon (19) guide le déplacement du volet (17) le long de l'axe longitudinal (A) et évite le déplacement latéral du volet (17) et tout mauvais alignement du volet (17) par rapport à l'axe longitudinal (A).
  8. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément de fixation (16) comporte un trou débouchant (23) s'étendant le long de l'axe longitudinal (A) ; le siège de robinet (7) étant fermé de manière étanche aux fluides par un autre boulon (15).
  9. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que le volet (17) est en forme de lance et comprend un manche (26) installé par ajustement serré dans le ressort hélicoïdal (18).
  10. Pompe selon la revendication 11, caractérisée en ce que le volet (17) comporte un trou borgne (27) pour réduire la masse inerte du volet (17).
  11. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit anneau d'étanchéité (30) définit un bord libre dudit manchon (19).
  12. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que l'anneau d'étanchéité (30) présente une surface d'étanchéité extérieure (31) correspondant à la forme d'une surface incurvée (10) du siège de robinet (7) et une surface d'étanchéité intérieure (32) correspondant à la forme du volet (17).
EP06425338A 2006-05-19 2006-05-19 Pompe de carburant à haute pression Not-in-force EP1857667B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT06425338T ATE451548T1 (de) 2006-05-19 2006-05-19 Kraftstoffhochdruckpumpe
DE602006010981T DE602006010981D1 (de) 2006-05-19 2006-05-19 Kraftstoffhochdruckpumpe
EP06425338A EP1857667B1 (fr) 2006-05-19 2006-05-19 Pompe de carburant à haute pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425338A EP1857667B1 (fr) 2006-05-19 2006-05-19 Pompe de carburant à haute pression

Publications (2)

Publication Number Publication Date
EP1857667A1 EP1857667A1 (fr) 2007-11-21
EP1857667B1 true EP1857667B1 (fr) 2009-12-09

Family

ID=36950431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06425338A Not-in-force EP1857667B1 (fr) 2006-05-19 2006-05-19 Pompe de carburant à haute pression

Country Status (3)

Country Link
EP (1) EP1857667B1 (fr)
AT (1) ATE451548T1 (fr)
DE (1) DE602006010981D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1395932B1 (it) * 2009-09-28 2012-11-02 Bosch Gmbh Robert Pompa di alta pressione
WO2015163246A1 (fr) * 2014-04-25 2015-10-29 日立オートモティブシステムズ株式会社 Pompe d'alimentation en carburant à haute pression
ITUB20155795A1 (it) * 2015-11-20 2017-05-20 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna
IT201600131338A1 (it) * 2016-12-27 2018-06-27 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE665886C (de) * 1936-12-12 1939-08-11 Orange Rudolf L Brennstoff-Einspritzpumpe fuer Vor- und Haupteinspritzung
GB521060A (en) 1937-11-13 1940-05-10 Rudolf L Orange Improvements in or relating to pressure control systems for fuel injection pumps
GB513349A (en) * 1938-07-25 1939-10-10 Bryce Ltd Improvements relating to fuel injection pumps
GB742847A (en) * 1953-10-21 1956-01-04 Porn & Dunwoody Ltd Improvements in diesel engine injection pumps
US6238190B1 (en) * 1999-03-18 2001-05-29 Diesel Technology Company Fuel injection pump and snubber valve assembly
DE10261415B3 (de) * 2002-12-30 2004-07-08 Siemens Ag Druckanpassungsvorrichtung

Also Published As

Publication number Publication date
EP1857667A1 (fr) 2007-11-21
ATE451548T1 (de) 2009-12-15
DE602006010981D1 (de) 2010-01-21

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