WO2024013374A1 - Fuel pump for the direct-injection of fuel for internal combustion engines - Google Patents

Fuel pump for the direct-injection of fuel for internal combustion engines Download PDF

Info

Publication number
WO2024013374A1
WO2024013374A1 PCT/EP2023/069661 EP2023069661W WO2024013374A1 WO 2024013374 A1 WO2024013374 A1 WO 2024013374A1 EP 2023069661 W EP2023069661 W EP 2023069661W WO 2024013374 A1 WO2024013374 A1 WO 2024013374A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
spring
pump
retaining washer
fingers
Prior art date
Application number
PCT/EP2023/069661
Other languages
French (fr)
Inventor
Richard Dupont
Christophe Breant
Original Assignee
Delphi Technologies Ip Limited
Borgwarner 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, Borgwarner France Sas filed Critical Delphi Technologies Ip Limited
Publication of WO2024013374A1 publication Critical patent/WO2024013374A1/en

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
    • 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
    • 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
    • F04B1/0439—Supporting or guiding means for the pistons
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • Fuel pump for direct fuel injection for internal combustion engines is
  • the invention relates to a fuel pump for direct fuel injection for internal combustion engines.
  • fuel from the tank is supplied by a low pressure fuel pump integrated into the tank.
  • This low pressure pump is generally electric and powers a high pressure pump which typically comprises a movable pump piston in a pump body.
  • the pump piston is actuated by a camshaft of the internal combustion engine so as to raise the fuel pressure in a pumping chamber of the pump body.
  • the high-pressure fuel is then distributed to the injectors which control the injection of fuel directly into the engine's combustion chamber.
  • Document EP 3 715 619 A1 shows an example of a pump of this type. An example is also reproduced in Figure 1.
  • the movement of the piston 101 in the pumping chamber 1050 is provided by the camshaft 102 against a spring 103 which tends to maintain one end of the piston 101 in support on a cam of the camshaft 102.
  • the spring is of the helical compression type and is supported on the one hand on a seat 104 fixed on the body 105 of the pump and on the other hand on a retaining washer 106 of retainer linked to the end of the piston 101 by connecting means 107.
  • the connecting means comprise two conical half-rings 1071 engaging with an indentation 1072 at the end of the piston and a conical housing 1073 carried by the retaining washer 106 retainer in which the conical half-rings 1071 are housed.
  • the slope of the cone of housing 1073 is oriented such that the action of spring 103 on the retaining washer 106 is blocked by the conical half-rings 1071 stuck in the housing 1073.
  • the invention relates to a fuel pump for the direct injection of fuel for internal combustion engines, the pump comprising a pump body, a pumping chamber in which a piston is slidably mounted, a spring bearing on the one hand on the pump body and on the other hand at one end of the piston projecting out of the pump body via a retaining washer and means of connection between the retaining washer and the end of the piston, the pump being characterized in that the connecting means comprise a plurality of fingers coming from a ring of the retaining washer and arranged projecting towards a central axis of the ring, one end of the fingers housed in a circular groove of the piston and being held by the spring resting on a shoulder delimiting the circular groove.
  • fixing the retaining washer does not require any other part.
  • the risk of a missing part is therefore eliminated.
  • the fact that the connection with the piston is made by fingers, therefore separate elements, allows an easy assembly in which the retaining washer is inserted onto the piston and the fingers spread until they reach the groove. There, the fingertips are seated in the groove and lock the retaining washer.
  • This assembly is simple to carry out, it is reliable and the retaining washer can be obtained by cutting and stamping operations, which is inexpensive.
  • the ends of the fingers are movable flexibly relative to the ring. The return of the fingertips into the circular groove when inserting the retaining washer on the piston occurs spontaneously.
  • the fingers are inclined relative to a plane perpendicular to the central axis, being oriented to provide bracing against the piston in the circular groove when the spring presses on the retaining washer.
  • the inclination of the fingers is between 15 and 35°, preferably between 20° and 30°.
  • a diameter of the bottom of the groove is less than an end diameter of the piston by a value between 2 and 10%, preferably between 4 and 5% of the end diameter. This ensures that the depth of the groove is sufficient to retain the retaining washer, without the piston being excessively weakened.
  • the retaining washer has a guide ring extending along the central axis of the ring along the spring to center the spring on the retaining washer. Make sure the spring is centered on the retaining washer.
  • the retaining washer has an annular sole linked to the crown to receive the spring.
  • the ring is linked to the crown.
  • the piston has a collar intended to come to rest against the pump body and limit the stroke of the piston when engaging the retaining washer on the piston. The piston may already be at the bottom of the pumping chamber, but sometimes this is too deep to insert the retaining washer onto the piston. By providing a collar, the piston stop position is determined independently.
  • the pump has a seat receiving the spring and resting on the pump body, the seat comprising a liner on which the spring is centered and surrounding the piston.
  • the invention also relates to a method of mounting a pump as defined above, according to which the piston is introduced into the chamber, the spring is placed around the piston, the retaining washer is placed on the spring, the spring is pressed and on the retaining washer to compress the spring until the fingers spread against the piston and the fingers return to the circular groove. This process is simpler than that of the prior art.
  • Figure 1 is a view of a sectional detail of a pump according to the prior art
  • Figure 2 is similar to Figure 1 during a phase of mounting a pump according to one embodiment of the invention.
  • Figure 3 is a view similar to Figure 2 after mounting the pump
  • Figure 4 is a sectional and perspective view of the end of a piston and a retaining washer of the pump of Figure 3;
  • Figure 5 is a perspective view of the retaining washer of Figure Figure 6 is a longitudinal sectional view of the retaining washer of Figure 5.
  • a fuel pump for direct fuel injection for internal combustion engines is shown in Figures 2 to 6.
  • the pump comprises a pump body 5, a pumping chamber 50 in which a piston 1 is slidably mounted, a spring 3 bearing on the one hand on the pump body 5 via a seat 4 and on the other hand at one end 10 of the piston 1 projecting out of the body of pump 5 via a retaining washer 6.
  • the retaining washer 6 comprises a sole 61 of annular shape having a central axis A for receiving the spring 3.
  • the retaining washer 6 further comprises a guide crown 62 also having as its axis the central axis A and extending along the spring 3 from the sole 61 to center the spring 3 on the retaining washer 6, and in particular on the sole 61.
  • the guide crown 62 has a substantially frustoconical shape.
  • the crown 62 is extended by a ring 63 also having the central axis A as its axis and extending in a plane raised relative to the plane of the sole 61.
  • Connecting means 7 are provided between the retaining washer 6 and the end 10 of the piston 1.
  • the connecting means 7 comprise a plurality of fingers 70 coming from the ring 63 of the retaining washer 6 and arranged projecting towards the central axis A while being inclined with a base linked to the ring 63 closer to the pump body 5 than the ends 700 of the fingers 70 in contact with the piston 1.
  • the end 700 of the fingers 70 is housed in a circular groove 71 of the piston 1 and is held by the spring 3 resting on a shoulder 710 delimiting the circular groove 71.
  • the end 700 of the fingers 70 is movable flexibly relative to the ring 63, as will be better seen in connection with the description of the pump assembly.
  • the fingers 70 are inclined relative to a plane perpendicular to the central axis A, being oriented to provide bracing against the piston 1 in the circular groove 71 when the spring 3 presses on the retaining washer 6
  • the inclination of the fingers 70 is typically between 24 and 30°.
  • a diameter of the bottom 710 of the circular groove 71 is less than an end diameter of the piston 1 of a value between 4 and 5% of the end diameter.
  • the piston 1 includes a collar 11 intended to come to bear against the pump body 5 and limit the stroke of the piston 1 when the retaining washer 6 is engaged on the piston 1.
  • the collar 11 could be replaced by an elastic ring inserted in a groove.
  • the seat 4 receiving the spring 3 is supported on the pump body 5 and fixed to it.
  • the seat 4 comprises a liner 40 on which the spring 3 is centered and surrounding the piston 1.
  • stopping means (not shown) can be housed between the body and the piston 1 so as to limit the stroke of the piston 1 against the spring 3.
  • the piston 1 is introduced into the chamber at the abutment of the collar 11 on the pump body 5, the seat 4 is fixed on the body around the piston 1, the spring 3 is placed around the piston 1 resting on the seat 4, the retaining washer 6 is placed on the spring 3, the retaining washer 6 is pressed to compress the spring 3.
  • the fingers 70 then move apart elastically under the action of the end 10 of the piston 1 until they reach the circular groove 71.
  • the elastic return of the fingers 70 pushes the ends of these into the circular groove 71 until they rest on the bottom of the circular groove 71.

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

A fuel pump for the direct-injection of fuel for internal combustion engines comprises a pump body (5), a pump chamber (50) in which a piston (1) is slidably mounted, a spring (3) bearing against the pump body (5) and against one end (10) of the piston (1) that projects out of the pump body (5) via a retaining washer (6) and connecting means (7) connecting the retaining washer (6) and the end (10) of the piston (1). The connecting means (7) comprise a plurality of fingers (70) emanating from a ring (63) of the retaining washer (6) and arranged so that they project towards the central axis (A) of the ring (63), one end (700) of the fingers (70) becoming lodged in a circular groove (71) of the piston (1) and being kept by the spring (3) bearing against a shoulder (710) delimiting the circular groove (71). Method for assembling the pump.

Description

Pompe à carburant pour l’injection directe de carburant pour les moteurs à combustion interne. Fuel pump for direct fuel injection for internal combustion engines.
Domaine technique Technical area
L’invention concerne une pompe à carburant pour l’injection directe de carburant pour les moteurs à combustion interne. The invention relates to a fuel pump for direct fuel injection for internal combustion engines.
Technique antérieure Prior art
Les systèmes de carburant dans les moteurs à combustion interne modernes alimentés en essence, en particulier ceux pour le marché automobile, utilisent l’injection directe d’essence dans laquelle des injecteurs de carburant sont utilisés pour injecter le carburant directement dans les chambres de combustion du moteur. Dans de tels systèmes à injection directe, le carburant en provenance du réservoir est fourni par une pompe à carburant à basse pression intégrée au réservoir. Cette pompe basse pression est en général électrique et alimente une pompe haute pression qui comprend typiquement un piston de pompe mobile dans un corps de pompe. Le piston de pompe est actionné par un arbre à cames du moteur à combustion interne de manière à relever la pression du carburant dans une chambre de pompage du corps de pompe. Le carburant sous haute pression est ensuite distribuée aux injecteurs qui commandent l’injection du carburant directement dans la chambre de combustion du moteur. Fuel systems in modern gasoline-powered internal combustion engines, particularly those for the automotive market, use gasoline direct injection in which fuel injectors are used to inject the fuel directly into the combustion chambers of the engine. In such direct injection systems, fuel from the tank is supplied by a low pressure fuel pump integrated into the tank. This low pressure pump is generally electric and powers a high pressure pump which typically comprises a movable pump piston in a pump body. The pump piston is actuated by a camshaft of the internal combustion engine so as to raise the fuel pressure in a pumping chamber of the pump body. The high-pressure fuel is then distributed to the injectors which control the injection of fuel directly into the engine's combustion chamber.
Le document EP 3 715 619 A1 montre un exemple de pompe de ce type. Un exemple est également reproduit sur la figure 1. Le mouvement du piston 101 dans la chambre de pompage 1050 est fourni par l’arbre à came 102 à l’encontre d’un ressort 103 qui tend à maintenir une extrémité du piston 101 en appui sur une came de l’arbre à cames 102. Le ressort est du type hélicoïdal de compression et prend appui d’une part sur un siège 104 fixé sur le corps 105 de la pompe et d’autre part sur une rondelle de retenue 106 de retenue liée à l’extrémité du piston 101 par des moyens de liaison 107. Les moyens de liaison comprennent deux demi-bagues coniques 1071 en prise avec une empreinte 1072 à l’extrémité du piston et un logement conique 1073 porté par la rondelle de retenue 106 de retenue dans lequel les demi-bagues coniques 1071 sont logées. La pente du cône du logement 1073 est orientée de telle sorte que l’action du ressort 103 sur la rondelle de retenue 106 est bloquée par les demi-bagues coniques 1071 coincées dans le logement 1073. Document EP 3 715 619 A1 shows an example of a pump of this type. An example is also reproduced in Figure 1. The movement of the piston 101 in the pumping chamber 1050 is provided by the camshaft 102 against a spring 103 which tends to maintain one end of the piston 101 in support on a cam of the camshaft 102. The spring is of the helical compression type and is supported on the one hand on a seat 104 fixed on the body 105 of the pump and on the other hand on a retaining washer 106 of retainer linked to the end of the piston 101 by connecting means 107. The connecting means comprise two conical half-rings 1071 engaging with an indentation 1072 at the end of the piston and a conical housing 1073 carried by the retaining washer 106 retainer in which the conical half-rings 1071 are housed. The slope of the cone of housing 1073 is oriented such that the action of spring 103 on the retaining washer 106 is blocked by the conical half-rings 1071 stuck in the housing 1073.
Même si ces moyens de retenue sont efficaces, ils présentent quelques inconvénients. On constate en effet que les opérations de montage sont complexes. Il faut en effet mettre en place le ressort et la rondelle de retenue autour du piston, puis comprimer le ressort afin de dégager suffisamment d’espace pour introduire les demi-bagues coniques. La compression du ressort peut alors être relâchée pour que la rondelle de retenue vienne emprisonner les demi-bagues coniques. On constate également qu’il arrive qu’une seule demi- bague soit mise en place et que ce défaut ne soit détecté que tardivement, entraînant des coûts d’intervention élevés. De plus, les surfaces de l’empreinte, des demi-bagues coniques et du logement sont des surfaces usinées et assez précises, ce qui induit un coût de production élevé. Although these restraints are effective, they have some drawbacks. We see in fact that the assembly operations are complex. It is necessary to place the spring and the retaining washer around the piston, then compress the spring in order to create enough space to introduce the conical half-rings. The compression of the spring can then be released so that the retaining washer traps the conical half-rings. We also note that it happens that only one half-ring is put in place and that this defect is not detected until late, leading to high intervention costs. In addition, the surfaces of the cavity, the conical half-rings and the housing are machined and fairly precise surfaces, which leads to a high production cost.
Exposé de l’invention Presentation of the invention
C’est donc un objectif de l’invention de fournir une pompe à carburant pour l’injection directe de carburant pour les moteurs à combustion interne dont la construction soit fiable et simple et avec des coûts minimisés. It is therefore an objective of the invention to provide a fuel pump for direct fuel injection for internal combustion engines whose construction is reliable and simple and with minimized costs.
Avec ces objectifs en vue, l’invention a pour objet une pompe à carburant pour l’injection directe de carburant pour les moteurs à combustion interne, la pompe comportant un corps de pompe, une chambre de pompage dans laquelle un piston est monté coulissant, un ressort prenant appui d’une part sur le corps de pompe et d’autre part à une extrémité du piston faisant saillie hors du corps de pompe par l’intermédiaire d’une rondelle de retenue et de moyens de liaison entre la rondelle de retenue et l’extrémité du piston, la pompe étant caractérisée en ce que les moyens de liaison comportent une pluralité de doigts issus d’un anneau de la rondelle de retenue et disposés en faisant saillie vers un axe central de l’anneau, une extrémité des doigts se logeant dans une rainure circulaire du piston et étant maintenue par le ressort en appui sur un épaulement délimitant la rainure circulaire. With these objectives in view, the invention relates to a fuel pump for the direct injection of fuel for internal combustion engines, the pump comprising a pump body, a pumping chamber in which a piston is slidably mounted, a spring bearing on the one hand on the pump body and on the other hand at one end of the piston projecting out of the pump body via a retaining washer and means of connection between the retaining washer and the end of the piston, the pump being characterized in that the connecting means comprise a plurality of fingers coming from a ring of the retaining washer and arranged projecting towards a central axis of the ring, one end of the fingers housed in a circular groove of the piston and being held by the spring resting on a shoulder delimiting the circular groove.
Grâce à l’invention, la fixation de la rondelle de retenue ne fait appel à aucune autre pièce. Le risque d’une absence de pièce est donc écarté. Le fait que la liaison avec le piston soit faite par des doigts, donc des éléments séparés, permet un montage facile dans lequel la rondelle de retenue est introduite sur le piston et les doigts s’écartent jusqu’à atteindre la rainure. Là, l’extrémité des doigts est logée dans la rainure et bloque la rondelle de retenue. Ce montage est simple à réaliser, il est fiable et la rondelle de retenue peut être obtenue par des opérations de découpe et d’emboutissage, ce qui est peu onéreux. Thanks to the invention, fixing the retaining washer does not require any other part. The risk of a missing part is therefore eliminated. The fact that the connection with the piston is made by fingers, therefore separate elements, allows an easy assembly in which the retaining washer is inserted onto the piston and the fingers spread until they reach the groove. There, the fingertips are seated in the groove and lock the retaining washer. This assembly is simple to carry out, it is reliable and the retaining washer can be obtained by cutting and stamping operations, which is inexpensive.
Selon une caractéristique avantageuse, l’extrémité des doigts est mobile de manière flexible par rapport à l’anneau. Le retour de l’extrémité des doigts dans la rainure circulaire lors de l’insertion de la rondelle de retenue sur le piston se fait spontanément. According to an advantageous characteristic, the ends of the fingers are movable flexibly relative to the ring. The return of the fingertips into the circular groove when inserting the retaining washer on the piston occurs spontaneously.
Selon un perfectionnement, les doigts sont inclinés par rapport à un plan perpendiculaire à l’axe central, en étant orientés pour réaliser un arc-boutement contre le piston dans la rainure circulaire lorsque le ressort appuie sur la rondelle de retenue. Ainsi plus la rondelle de retenue est soumise à une force d’extraction hors du piston, plus l’extrémité des doigts est appuyée dans la rainure. Les doigts répartis tout autour de la rainure s’équilibrent les uns les autres. La force de rétention ainsi obtenue est très haute. According to an improvement, the fingers are inclined relative to a plane perpendicular to the central axis, being oriented to provide bracing against the piston in the circular groove when the spring presses on the retaining washer. Thus, the more the retaining washer is subjected to an extraction force from the piston, the more the ends of the fingers are pressed into the groove. The fingers distributed all around the groove balance each other. The retention force thus obtained is very high.
De manière particulière, l’inclinaison des doigts est comprise entre 15 et 35°, de préférence entre 20° et 30°. In particular, the inclination of the fingers is between 15 and 35°, preferably between 20° and 30°.
Selon une disposition constructive, un diamètre du fond de la gorge est inférieur à un diamètre d’extrémité du piston d’une valeur comprise entre 2 et 10 %, de préférence entre 4 et 5 % du diamètre d’extrémité. On s’assure ainsi que la profondeur de la rainure est suffisante pour retenir la rondelle de retenue, sans que le piston soit excessivement affaibli. According to a constructive arrangement, a diameter of the bottom of the groove is less than an end diameter of the piston by a value between 2 and 10%, preferably between 4 and 5% of the end diameter. This ensures that the depth of the groove is sufficient to retain the retaining washer, without the piston being excessively weakened.
Selon d’autres dispositions : According to other provisions:
• la rondelle de retenue comporte une couronne de guidage s’étendant selon l’axe central de l’anneau le long du ressort pour centrer le ressort sur la rondelle de retenue. On s’assure que le ressort est bien centré sur la rondelle de retenue. • the retaining washer has a guide ring extending along the central axis of the ring along the spring to center the spring on the retaining washer. Make sure the spring is centered on the retaining washer.
• la rondelle de retenue comporte une semelle de forme annulaire liée à la couronne pour recevoir le ressort. l’anneau est lié à la couronne. • le piston comporte une collerette destinée à venir en appui contre le corps de pompe et limiter la course du piston lors de l’engagement de la rondelle de retenue sur le piston. Le piston peut déjà être en butée au fond de la chambre de pompage, mais parfois ceci est trop profond pour pouvoir insérer la rondelle de retenue sur le piston. En prévoyant une collerette, on détermine indépendamment la position de butée du piston. • the retaining washer has an annular sole linked to the crown to receive the spring. the ring is linked to the crown. • the piston has a collar intended to come to rest against the pump body and limit the stroke of the piston when engaging the retaining washer on the piston. The piston may already be at the bottom of the pumping chamber, but sometimes this is too deep to insert the retaining washer onto the piston. By providing a collar, the piston stop position is determined independently.
• la pompe comporte un siège recevant le ressort et en appui sur le corps de pompe, le siège comportant une chemise sur laquelle le ressort est centré et entourant le piston. • the pump has a seat receiving the spring and resting on the pump body, the seat comprising a liner on which the spring is centered and surrounding the piston.
L’invention a aussi pour objet un procédé de montage d’une pompe telle que définie précédemment, selon lequel on introduit le piston dans la chambre, on place le ressort autour du piston, on place la rondelle de retenue sur le ressort, on appuie sur la rondelle de retenue pour comprimer le ressort jusqu’à l’écartement des doigts contre le piston et le retour des doigts dans la rainure circulaire. Ce procédé est plus simple que celui de l’art antérieur. The invention also relates to a method of mounting a pump as defined above, according to which the piston is introduced into the chamber, the spring is placed around the piston, the retaining washer is placed on the spring, the spring is pressed and on the retaining washer to compress the spring until the fingers spread against the piston and the fingers return to the circular groove. This process is simpler than that of the prior art.
Brève description des figures Brief description of the figures
L’invention sera mieux comprise et d’autres particularités et avantages apparaîtront à la lecture de la description qui va suivre, la description faisant référence aux dessins annexés parmi lesquels : The invention will be better understood and other particularities and advantages will appear on reading the description which follows, the description referring to the appended drawings among which:
• la figure 1 est une vue d’un détail en coupe d’une pompe selon l’art antérieur ; • Figure 1 is a view of a sectional detail of a pump according to the prior art;
• la figure 2 est une similaire à la figure 1 pendant une phase de montage d’une pompe selon un mode de réalisation de l’invention ; • Figure 2 is similar to Figure 1 during a phase of mounting a pump according to one embodiment of the invention;
• la figure 3 est une vue similaire à la figure 2 après le montage de la pompe ; • Figure 3 is a view similar to Figure 2 after mounting the pump;
• la figure 4 est une vue en coupe et en perspective de l’extrémité d’un piston et d’une rondelle de retenue de la pompe de la figure 3 ; la figure 5 est une vue en perspective de la rondelle de retenue de la figure la figure 6 est une vue en coupe longitudinale de la rondelle de retenue de la figure 5. • Figure 4 is a sectional and perspective view of the end of a piston and a retaining washer of the pump of Figure 3; Figure 5 is a perspective view of the retaining washer of Figure Figure 6 is a longitudinal sectional view of the retaining washer of Figure 5.
Description détaillée detailed description
Une pompe à carburant pour l’injection directe de carburant pour les moteurs à combustion interne selon un mode de réalisation de l’invention est représentée sur les figures 2 à 6. La pompe comporte un corps de pompe 5, une chambre de pompage 50 dans laquelle un piston 1 est monté coulissant, un ressort 3 prenant appui d’une part sur le corps de pompe 5 par l’intermédiaire d’un siège 4 et d’autre part à une extrémité 10 du piston 1 faisant saillie hors du corps de pompe 5 par l’intermédiaire d’une rondelle de retenue 6. La rondelle de retenue 6 comporte une semelle 61 de forme annulaire ayant un axe central A pour recevoir le ressort 3. La rondelle de retenue 6 comporte en outre une couronne 62 de guidage ayant également pour axe l’axe central A et s’étendant le long du ressort 3 depuis la semelle 61 pour centrer le ressort 3 sur la rondelle de retenue 6, et en particulier sur la semelle 61 . La couronne 62 de guidage a une forme sensiblement tronconique. La couronne 62 se prolonge par un anneau 63 ayant également pour axe l’axe central A et s’étendant dans un plan surélevé par rapport au plan de la semelle 61 . A fuel pump for direct fuel injection for internal combustion engines according to one embodiment of the invention is shown in Figures 2 to 6. The pump comprises a pump body 5, a pumping chamber 50 in which a piston 1 is slidably mounted, a spring 3 bearing on the one hand on the pump body 5 via a seat 4 and on the other hand at one end 10 of the piston 1 projecting out of the body of pump 5 via a retaining washer 6. The retaining washer 6 comprises a sole 61 of annular shape having a central axis A for receiving the spring 3. The retaining washer 6 further comprises a guide crown 62 also having as its axis the central axis A and extending along the spring 3 from the sole 61 to center the spring 3 on the retaining washer 6, and in particular on the sole 61. The guide crown 62 has a substantially frustoconical shape. The crown 62 is extended by a ring 63 also having the central axis A as its axis and extending in a plane raised relative to the plane of the sole 61.
Des moyens de liaison 7 sont prévus entre la rondelle de retenue 6 et l’extrémité 10 du piston 1. Les moyens de liaison 7 comportent une pluralité de doigts 70 issus de l’anneau 63 de la rondelle de retenue 6 et disposés en faisant saillie vers l’axe central A en étant inclinés avec une base liée à l’anneau 63 plus proche du corps de pompe 5 que les extrémités 700 des doigts 70 en contact avec le piston 1 . L’extrémité 700 des doigts 70 se loge dans une rainure circulaire 71 du piston 1 et est maintenue par le ressort 3 en appui sur un épaulement 710 délimitant la rainure circulaire 71 . L’extrémité 700 des doigts 70 est mobile de manière flexible par rapport à l’anneau 63, comme on le verra mieux en lien avec la description du montage de la pompe. Autrement dit, les doigts 70 sont inclinés par rapport à un plan perpendiculaire à l’axe central A, en étant orientés pour réaliser un arc- boutement contre le piston 1 dans la rainure circulaire 71 lorsque le ressort 3 appuie sur la rondelle de retenue 6. L’inclinaison des doigts 70 est typiquement comprise entre 24 et 30°. Un diamètre du fond 710 de la rainure circulaire 71 est inférieur à un diamètre d’extrémité du piston 1 d’une valeur comprise entre 4 et 5 % du diamètre d’extrémité. Connecting means 7 are provided between the retaining washer 6 and the end 10 of the piston 1. The connecting means 7 comprise a plurality of fingers 70 coming from the ring 63 of the retaining washer 6 and arranged projecting towards the central axis A while being inclined with a base linked to the ring 63 closer to the pump body 5 than the ends 700 of the fingers 70 in contact with the piston 1. The end 700 of the fingers 70 is housed in a circular groove 71 of the piston 1 and is held by the spring 3 resting on a shoulder 710 delimiting the circular groove 71. The end 700 of the fingers 70 is movable flexibly relative to the ring 63, as will be better seen in connection with the description of the pump assembly. In other words, the fingers 70 are inclined relative to a plane perpendicular to the central axis A, being oriented to provide bracing against the piston 1 in the circular groove 71 when the spring 3 presses on the retaining washer 6 The inclination of the fingers 70 is typically between 24 and 30°. A diameter of the bottom 710 of the circular groove 71 is less than an end diameter of the piston 1 of a value between 4 and 5% of the end diameter.
Le piston 1 comporte une collerette 11 destinée à venir en appui contre le corps de pompe 5 et limiter la course du piston 1 lors de l’engagement de la rondelle de retenue 6 sur le piston 1 . La collerette 11 pourrait être remplacée par une bague élastique inséré dans une gorge. The piston 1 includes a collar 11 intended to come to bear against the pump body 5 and limit the stroke of the piston 1 when the retaining washer 6 is engaged on the piston 1. The collar 11 could be replaced by an elastic ring inserted in a groove.
Le siège 4 recevant le ressort 3 est en appui sur le corps de pompe 5 et fixé sur lui. Le siège 4 comporte une chemise 40 sur laquelle le ressort 3 est centré et entourant le piston 1 . Optionnellement, des moyens d’arrêt (non représentés) peuvent être sont logés entre le corps et le piston 1 de manière à limiter la course du piston 1 à l’encontre du ressort 3. The seat 4 receiving the spring 3 is supported on the pump body 5 and fixed to it. The seat 4 comprises a liner 40 on which the spring 3 is centered and surrounding the piston 1. Optionally, stopping means (not shown) can be housed between the body and the piston 1 so as to limit the stroke of the piston 1 against the spring 3.
Pour le montage de la pompe, on introduit le piston 1 dans la chambre en butée de la collerette 11 sur le corps de pompe 5, on fixe le siège 4 sur le corps autour du piston 1 , on place le ressort 3 autour du piston 1 en appui sur le siège 4, on place la rondelle de retenue 6 sur le ressort 3, on appuie sur la rondelle de retenue 6 pour comprimer le ressort 3. Les doigts 70 s’écartent alors de manière élastique sous l’action de l’extrémité 10 du piston 1 jusqu’à ce qu’ils atteignent la rainure circulaire 71 . Le rappel élastique des doigts 70 poussent les extrémités de ceux-ci dans la rainure circulaire 71 jusqu’à ce qu’ils soient en appui sur le fond de la rainure circulaire 71. On peut alors relâcher le ressort 3, son action est reprise par la rondelle de retenue 6 qui vient en appui contre le fond de la rainure circulaire 71 et l’épaulement 710. To assemble the pump, the piston 1 is introduced into the chamber at the abutment of the collar 11 on the pump body 5, the seat 4 is fixed on the body around the piston 1, the spring 3 is placed around the piston 1 resting on the seat 4, the retaining washer 6 is placed on the spring 3, the retaining washer 6 is pressed to compress the spring 3. The fingers 70 then move apart elastically under the action of the end 10 of the piston 1 until they reach the circular groove 71. The elastic return of the fingers 70 pushes the ends of these into the circular groove 71 until they rest on the bottom of the circular groove 71. We can then release the spring 3, its action is taken over by the retaining washer 6 which bears against the bottom of the circular groove 71 and the shoulder 710.

Claims

Revendications Claims
1 . Pompe à carburant pour l’injection directe de carburant pour les moteurs à combustion interne, la pompe comportant un corps de pompe (5), une chambre de pompage (50) dans laquelle un piston (1 ) est monté coulissant, un ressort (3) prenant appui d’une part sur le corps de pompe (5) et d’autre part à une extrémité (10) du piston (1 ) faisant saillie hors du corps de pompe (5) par l’intermédiaire d’une rondelle de retenue (6) et de moyens de liaison (7) entre la rondelle de retenue (6) et l’extrémité (10) du piston (1 ), la pompe étant caractérisée en ce que les moyens de liaison (7) comportent une pluralité de doigts (70) issus d’un anneau (63) de la rondelle de retenue (6) et disposés en faisant saillie vers un axe central (A) de l’anneau (63), une extrémité (700) des doigts (70) se logeant dans une rainure circulaire (71 ) du piston (1 ) et étant maintenue par le ressort (3) en appui sur un épaulement (710) délimitant la rainure circulaire (71 ), les doigts (70) étant inclinés par rapport à un plan perpendiculaire à l’axe central (A), en étant orientés pour réaliser un arc-boutement contre le piston (1 ) dans la rainure circulaire (71 ) lorsque le ressort (3) appuie sur la rondelle de retenue (6).1. Fuel pump for direct fuel injection for internal combustion engines, the pump comprising a pump body (5), a pumping chamber (50) in which a piston (1) is slidably mounted, a spring (3 ) bearing on the one hand on the pump body (5) and on the other hand on one end (10) of the piston (1) projecting out of the pump body (5) via a washer retainer (6) and connection means (7) between the retaining washer (6) and the end (10) of the piston (1), the pump being characterized in that the connection means (7) comprise a plurality fingers (70) coming from a ring (63) of the retaining washer (6) and arranged projecting towards a central axis (A) of the ring (63), one end (700) of the fingers (70) ) housed in a circular groove (71) of the piston (1) and being held by the spring (3) resting on a shoulder (710) delimiting the circular groove (71), the fingers (70) being inclined relative to a plane perpendicular to the central axis (A), being oriented to provide bracing against the piston (1) in the circular groove (71) when the spring (3) presses on the retaining washer (6).
2. Pompe selon la revendication 1 , dans laquelle l’extrémité (700) des doigts (70) est mobile de manière flexible par rapport à l’anneau (63). 2. Pump according to claim 1, in which the end (700) of the fingers (70) is movable flexibly relative to the ring (63).
3. Pompe selon la revendication 1 ou 2, dans laquelle l’inclinaison des doigts (70) est comprise entre 15 et 35°, de préférence entre 20° et 30°. 3. Pump according to claim 1 or 2, in which the inclination of the fingers (70) is between 15 and 35°, preferably between 20° and 30°.
4. Pompe selon l’une des revendications précédentes, un diamètre du fond de la gorge est inférieur à un diamètre d’extrémité du piston (1 ) d’une valeur comprise entre 2 et 10 %, de préférence entre 4 et 5 % du diamètre d’extrémité. 4. Pump according to one of the preceding claims, a diameter of the bottom of the groove is less than an end diameter of the piston (1) by a value between 2 and 10%, preferably between 4 and 5% of the end diameter.
5. Pompe selon l’une des revendications précédentes, dans laquelle la rondelle de retenue (6) comporte une couronne (62) de guidage s’étendant selon l’axe central (A) de l’anneau (63) le long du ressort (3) pour centrer le ressort (3) sur la rondelle de retenue (6). 5. Pump according to one of the preceding claims, in which the retaining washer (6) comprises a guide crown (62) extending along the central axis (A) of the ring (63) along the spring (3) to center the spring (3) on the retaining washer (6).
6. Pompe selon la revendication 5, dans laquelle la rondelle de retenue (6) comporte une semelle (61 ) de forme annulaire liée à la couronne (62) pour recevoir le ressort (3). Pompe selon la revendication 5 ou 6, dans laquelle l’anneau (63) est lié à la couronne (62). Pompe selon l’une des revendications précédentes, dans laquelle le piston (1 ) comporte une collerette (11 ) destinée à venir en appui contre le corps de pompe (5) et limiter la course du piston (1 ) lors de l’engagement de la rondelle de retenue (6) sur le piston (1 ). Pompe selon l’une des revendications précédentes, caractérisée en ce qu’elle comporte un siège (4) recevant le ressort (3) et en appui sur le corps de pompe (5), le siège (4) comportant une chemise (40) sur laquelle le ressort (3) est centré et entourant le piston (1 ). Procédé de montage d’une pompe selon l’une des revendications précédentes, caractérisé en ce qu’on introduit le piston (1 ) dans la chambre, on place le ressort (3) autour du piston (1 ), on place la rondelle de retenue (6) sur le ressort (3), on appuie sur la rondelle de retenue (6) pour comprimer le ressort (3) jusqu’à l’écartement des doigts (70) contre le piston (1 ) et le retour des doigts (70) dans la rainure circulaire (71 ). 6. Pump according to claim 5, in which the retaining washer (6) comprises a sole (61) of annular shape linked to the crown (62) to receive the spring (3). Pump according to claim 5 or 6, in which the ring (63) is linked to the crown (62). Pump according to one of the preceding claims, in which the piston (1) comprises a collar (11) intended to come to bear against the pump body (5) and limit the stroke of the piston (1) when engaging the the retaining washer (6) on the piston (1). Pump according to one of the preceding claims, characterized in that it comprises a seat (4) receiving the spring (3) and resting on the pump body (5), the seat (4) comprising a jacket (40) on which the spring (3) is centered and surrounding the piston (1). Method of mounting a pump according to one of the preceding claims, characterized in that the piston (1) is introduced into the chamber, the spring (3) is placed around the piston (1), the washer is placed retainer (6) on the spring (3), we press on the retaining washer (6) to compress the spring (3) until the fingers (70) are spaced against the piston (1) and the fingers return (70) in the circular groove (71).
PCT/EP2023/069661 2022-07-15 2023-07-14 Fuel pump for the direct-injection of fuel for internal combustion engines WO2024013374A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2207290A FR3137945A1 (en) 2022-07-15 2022-07-15 Fuel pump for direct fuel injection for internal combustion engines.
FRFR2207290 2022-07-15

Publications (1)

Publication Number Publication Date
WO2024013374A1 true WO2024013374A1 (en) 2024-01-18

Family

ID=83280594

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/069661 WO2024013374A1 (en) 2022-07-15 2023-07-14 Fuel pump for the direct-injection of fuel for internal combustion engines

Country Status (2)

Country Link
FR (1) FR3137945A1 (en)
WO (1) WO2024013374A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5275376A (en) * 1992-09-29 1994-01-04 Trw Inc. Spring retainer
DE10345061A1 (en) * 2003-09-26 2005-04-14 Robert Bosch Gmbh Plunger assembly for a high pressure pump and high pressure pump with at least one plunger assembly
WO2016108846A1 (en) * 2014-12-30 2016-07-07 Cummins Inc. Releasable pumping plunger retractor for fuel injection pump
DE102015122766A1 (en) * 2015-12-23 2017-08-03 Voss Automotive Gmbh "Toothed disc with multi-bar retaining teeth"
EP3715619A1 (en) 2019-03-29 2020-09-30 Delphi Technologies IP Limited Fuel pump for gasoline direct injection
DE102019118891A1 (en) * 2019-07-12 2021-01-14 Schaeffler Technologies AG & Co. KG Roller tappet for a high pressure fuel pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5275376A (en) * 1992-09-29 1994-01-04 Trw Inc. Spring retainer
DE10345061A1 (en) * 2003-09-26 2005-04-14 Robert Bosch Gmbh Plunger assembly for a high pressure pump and high pressure pump with at least one plunger assembly
WO2016108846A1 (en) * 2014-12-30 2016-07-07 Cummins Inc. Releasable pumping plunger retractor for fuel injection pump
DE102015122766A1 (en) * 2015-12-23 2017-08-03 Voss Automotive Gmbh "Toothed disc with multi-bar retaining teeth"
EP3715619A1 (en) 2019-03-29 2020-09-30 Delphi Technologies IP Limited Fuel pump for gasoline direct injection
DE102019118891A1 (en) * 2019-07-12 2021-01-14 Schaeffler Technologies AG & Co. KG Roller tappet for a high pressure fuel pump

Also Published As

Publication number Publication date
FR3137945A1 (en) 2024-01-19

Similar Documents

Publication Publication Date Title
EP1184583B1 (en) Axialy pre-stressed roller bearing especially for a steering column in a motor vehicle
FR2868133A1 (en) SUPPORT ELEMENT FOR INJECTOR AND FUEL SUPPLY DRIVE OF INTERNAL COMBUSTION ENGINE
FR2998629A1 (en) FOLLOWING ROLL DEVICE OF A CAM
EP0941414A1 (en) Rolling bearing of steering column for motor vehicles
FR3057047A1 (en) CONTROLLED ANGULAR POSITION CLAMPING SYSTEM FOR CONNECTING TWO TUBES
CA2724256C (en) Member for locking ring sectors on a turbine engine casing, including r dial passages for gripping same
EP1146244B1 (en) Clutch release bearing
FR3035928A1 (en) PULLEY DEVICE FOR TILT ROLLER OR ROLLER
EP2039885B1 (en) Element for locking ring sectors on the casing of a turbomachine, comprising handling means
FR3016666A1 (en) BALL JOINT DEVICE.
EP0806581B1 (en) Clutch release bearing with an resilient ring
FR2786819A1 (en) RADIAL PISTON PUMP
EP1890030B1 (en) Quick connect coupling
EP1817520B1 (en) Guide bushing easily inserted into a connection bore and corresponding connection
WO2024013374A1 (en) Fuel pump for the direct-injection of fuel for internal combustion engines
FR2844850A1 (en) Pre-stressed bearing for automobile steering column comprises outer and inner bushes with track for bearings, support ring able to move axially relative to bushes and elastic element between support ring and outer bush support surface
EP0878622A1 (en) Fixing flange of an injector
FR2938038A1 (en) SEALING ELEMENT WITHOUT RETENTION AREA AND CONNECTING DEVICE COMPRISING SUCH A SEALING ELEMENT
FR3139603A1 (en) Fuel pump for direct fuel injection for internal combustion engines with retaining washer.
EP3027883B1 (en) Arrangement of a valve clipped to a pump
EP1522356B1 (en) Sealed coupling device for a tube with a threaded extension section
WO2006067353A1 (en) Roller bearing for traction effort puck-up comprising a flange associated with the inner ring
FR2812364A1 (en) Hydraulic tensioner for endless link comprises cylindrical housing containing hollow piston, spring which, with piston and housing supports and non-return valve, constitute sub-assembly introduced into high pressure chamber
FR3076882A1 (en) DEVICE FOR RAPID CONNECTION OF A CARTRIDGE TYPE TUBE
FR3091915A1 (en) "Metal part for an internal combustion engine and assembly comprising such a part"

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23742300

Country of ref document: EP

Kind code of ref document: A1