FR2814502A1 - High-pressure fuel pump for i.c. engine with common rail feed has piston rod rings with sufficient power to balance forces on polygonal ring - Google Patents

High-pressure fuel pump for i.c. engine with common rail feed has piston rod rings with sufficient power to balance forces on polygonal ring Download PDF

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Publication number
FR2814502A1
FR2814502A1 FR0112085A FR0112085A FR2814502A1 FR 2814502 A1 FR2814502 A1 FR 2814502A1 FR 0112085 A FR0112085 A FR 0112085A FR 0112085 A FR0112085 A FR 0112085A FR 2814502 A1 FR2814502 A1 FR 2814502A1
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FR
France
Prior art keywords
polygonal ring
pistons
pump
stress
springs
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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.)
Granted
Application number
FR0112085A
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French (fr)
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FR2814502B1 (en
Inventor
Gerd Blessing
Franz Huber
Gunter Kellermann
Walter Modrich
Bernd Wiemann
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Daimler AG
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DaimlerChrysler AG
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Publication of FR2814502A1 publication Critical patent/FR2814502A1/en
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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
    • F02M59/02—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
    • F02M59/08—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 two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
    • 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
    • F02M59/04—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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

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

Abstract

The high-pressure pump, having a number of pistons located round a polygonal ring (4) driven by a cam (3) turned by the engine and actuating piston rods (2) pressed against it by springs (7), has the springs made with sufficient power to balance the forces applied to the polygonal ring in the even of failure caused by the high pressure of fuel against the pistons. The power of the springs is about four times that required for their dynamic performance.

Description

<Desc/Clms Page number 1> <Desc / Clms Page number 1>

L'invention concerne une pompe à haute pression pour un système d'injection à haute pression d'un moteur à combustion interne avec compression d'air ayant plusieurs pistons de pompe qui sont répartis suivant la circonférence d'un anneau polygonal entraîné par un excentrique et qui subissent chacun la sollicitation d'un ressort de tige de piston et celle de la haute pression du carburant, pressant les pistons contre l'anneau polygonal. The invention relates to a high-pressure pump for a high-pressure injection system of an internal combustion engine with air compression having several pump pistons which are distributed along the circumference of a polygonal ring driven by an eccentric and which each undergo the stress of a piston rod spring and that of the high fuel pressure, pressing the pistons against the polygonal ring.

Dans le cas des moteurs à combustion interne avec compression d'air et système d'injection à rampe commune dit common rail , be carburant est pompé avec une pompe à très haute pression dans le système de carburant à haute pression (common rail). Ceci est généralement réalisé au moyen d'une pompe à haute pression comportant plusieurs pistons de pompe (trois ou quatre) qui sont entraînés par un anneau polygonal, dont le mouvement est assuré par un excentrique entraîné par le moteur à explosion. L'anneau polygonal est entraîné par l'excentrique et effectue un mouvement de translation lors de sa rotation. L'anneau polygonal entraîne les pistons de la pompe en étant en même temps stabilisé par les pistons de la pompe, grâce au fait qu'aussi bien les ressorts des tiges des pistons, que les forces dues au carburant sous haute pression agissent,

Figure img00010001

contre la force produite par l'excentrique. In the case of internal combustion engines with air compression and common rail injection system called common rail, the fuel is pumped with a very high pressure pump in the high pressure fuel system (common rail). This is generally achieved by means of a high pressure pump comprising several pump pistons (three or four) which are driven by a polygonal ring, the movement of which is ensured by an eccentric driven by the internal combustion engine. The polygonal ring is driven by the eccentric and performs a translational movement during its rotation. The polygonal ring drives the pistons of the pump while at the same time being stabilized by the pistons of the pump, thanks to the fact that both the springs of the piston rods and the forces due to the fuel under high pressure act,
Figure img00010001

against the force produced by the eccentric.

Si la pompe à haute pression n'était pas en mesure d'assurer une alimentation en carburant par tous les pistons, l'effet de stabilisation des sollicitations exercées par suite de la pression du carburant sur l'anneau polygonal cesserait. Dans ces circonstances, l'anneau polygonal serait soumis à une forte torsion et la pompe à haute pression pourrait subir des détériorations. If the high-pressure pump was unable to supply fuel to all of the pistons, the stress-stabilizing effect of the stresses exerted by the fuel pressure on the polygon ring would cease. Under these circumstances, the polygon ring would be subject to strong torsion and the high pressure pump could be damaged.

L'invention a pour objectif de proposer des dispositions au niveau de la pompe à haute pression pour stabiliser l'anneau polygonal et éviter que la pompe à haute pression ne subisse de dégâts, si tous les pistons de la pompe n'étaient pas en mesure d'assurer une alimentation en carburant.

Figure img00010002
The invention aims to propose arrangements at the high pressure pump to stabilize the polygonal ring and prevent the high pressure pump from being damaged, if all the pistons of the pump were not able provide fuel.
Figure img00010002

Cet objectif est atteint grâce au fait que la sollicitation des ressorts des tiges des pistons est suffisamment élevée-compte tenu de la dynamique des pistons- This objective is achieved thanks to the fact that the stress on the springs of the piston rods is sufficiently high-taking into account the dynamics of the pistons-

<Desc/Clms Page number 2><Desc / Clms Page number 2>

pour assurer, en cas de défaillance de la sollicitation due à la haute pression du carburant exercée par des pistons de la pompe sur l'anneau polygonal, un équilibrage des forces s'exerçant sur l'anneau polygonal.  to ensure, in the event of failure of the stress due to the high fuel pressure exerted by pistons of the pump on the polygonal ring, a balancing of the forces exerted on the polygonal ring.

Une variante appropriée et avantageuse de l'invention est définie par le fait que la sollicitation des ressorts des tiges est environ quatre fois supérieure à celle

Figure img00020001

nécessaire pour la dynamique des pistons. An appropriate and advantageous variant of the invention is defined by the fact that the stress on the rod springs is approximately four times greater than that
Figure img00020001

necessary for the dynamics of the pistons.

En augmentant suffisamment la sollicitation des ressorts des tiges des pistons par rapport à ce qui est nécessaire pour la dynamique des pistons, on peut diminuer de manière significative l'angle de torsion maximum apparaissant sur l'anneau polygonal. Quand un piston n'assure plus une alimentation en carburant, le piston et l'élément de transmission entre le piston et le profil du polygone, dénommé patin de piston, n'est plus sollicité par l'effet de la pression du carburant et l'effet de stabilisation des patins des pistons est perdu. Selon l'invention, cette

Figure img00020002

diminution de la force de contact est compensée par l'augmentation de la sollicitation exercée par le ressort de la tige de piston, ce qui permet de stabiliser l'anneau polygonal. Comme la sollicitation exercée sur l'anneau polygonal par la haute pression du carburant dépasse très largement la sollicitation même augmentée des ressorts, l'augmentation de la sollicitation exercée par les ressorts n'intervient pas dans le bilan global des forces auxquelles sont soumis l'excentrique et l'anneau polygonal. Par exemple, une augmentation de la sollicitation exercée par les ressorts des tiges des pistons dans des dispositifs de série par un facteur de quatre ne provoque qu'une augmentation de 3 % des forces de friction. By sufficiently increasing the stress on the springs of the piston rods compared to what is necessary for the dynamics of the pistons, it is possible to significantly reduce the maximum angle of torsion appearing on the polygonal ring. When a piston no longer provides fuel, the piston and the transmission element between the piston and the polygon profile, called the piston shoe, is no longer stressed by the effect of the fuel pressure and the the stabilization effect of the piston shoes is lost. According to the invention, this
Figure img00020002

decrease in contact force is compensated by the increase in the stress exerted by the spring of the piston rod, which makes it possible to stabilize the polygonal ring. As the stress exerted on the polygonal ring by the high fuel pressure greatly exceeds the stress even increased by the springs, the increase in the stress exerted by the springs does not intervene in the overall balance of forces to which the eccentric and the polygonal ring. For example, an increase in the stress exerted by the springs of the piston rods in series devices by a factor of four causes only a 3% increase in friction forces.

Cela signifie qu'une augmentation de la sollicitation exercée par les ressorts ne

Figure img00020003

produit pas une augmentation notable du couple moteur de la pompe à haute pression, tout en augmentant la protection de la pompe contre un risque de détérioration des pistons. This means that an increase in the stress exerted by the springs does not
Figure img00020003

does not produce a significant increase in the motor torque of the high pressure pump, while increasing the protection of the pump against a risk of damage to the pistons.

L'invention sera décrite ci-après d'une manière plus détaillée à l'aide d'un exemple de réalisation représenté dans le dessin unique. The invention will be described below in more detail with the aid of an embodiment shown in the single drawing.

<Desc/Clms Page number 3> <Desc / Clms Page number 3>

Figure img00030001

Une pompe à haute pression 1 avec trois pistons 2 de pompe est entraînée par un excentrique 3 et un anneau polygonal 4. L'excentrique 3 est entraîné, par exemple, par un arbre à cames (non représenté) et il provoque un mouvement de translation de l'anneau polygonal effectuant une trajectoire circulaire. L'anneau polygonal a trois aplatissements 5 espacés de 120 0 sur lesquels glissent les patins 6 des pistons en transférant aux pistons 2 de la pompe la partie radiale du mouvement de l'anneau polygonal. Les pistons 2 de la pompe sont disposés radialement par rapport à l'axe de rotation de l'excentrique 3. Pour éviter que les patins 6 des pistons ne se soulèvent par rapport à l'anneau polygonal 4, des ressorts 7 des tiges des pistons poussent les patins des pistons contre l'anneau polygonal. En outre, lorsque le système d'alimentation en carburant (non représenté) est sous pression, les pistons 2 de la pompe poussent les patins 6 des pistons contre l'anneau polygonal 4. Grâce à la répartition régulière des pistons 2 de pompe sur la circonférence, on obtient une sollicitation symétrique de l'anneau polygonal 4 et l'anneau polygonal s'en trouve stabilisé dans son mouvement. L'effet renforcé des ressorts 7 des tiges des pistons assure un fonctionnement stable en cas d'absence d'une sollicitation par la pression du carburant s'exerçant sur les pistons 2 de la pompe.
Figure img00030001

A high pressure pump 1 with three pump pistons 2 is driven by an eccentric 3 and a polygonal ring 4. The eccentric 3 is driven, for example, by a camshaft (not shown) and it causes a translational movement of the polygonal ring performing a circular path. The polygonal ring has three flattenings 5 spaced 120 0 over which the pads 6 of the pistons slide, transferring to the pistons 2 of the pump the radial part of the movement of the polygonal ring. The pistons 2 of the pump are arranged radially relative to the axis of rotation of the eccentric 3. To prevent the pads 6 of the pistons from being lifted relative to the polygonal ring 4, springs 7 of the piston rods push the piston pads against the polygon ring. In addition, when the fuel supply system (not shown) is under pressure, the pistons 2 of the pump push the pads 6 of the pistons against the polygonal ring 4. Thanks to the regular distribution of the pistons 2 of the pump over the circumference, a symmetrical stress is obtained on the polygonal ring 4 and the polygonal ring is thereby stabilized in its movement. The reinforced effect of the springs 7 of the piston rods ensures stable operation in the absence of stress by the fuel pressure exerted on the pistons 2 of the pump.

Claims (2)

Revendicationsclaims 1. Pompe à haute pression pour un système d'injection à haute pression d'un moteur à combustion interne avec compression d'air ayant plusieurs pistons de pompe qui sont répartis suivant la circonférence d'un anneau polygonal (4) entraîné par un excentrique (3) et qui subissent chacun la sollicitation d'un ressort (7) de tige de piston et celle de la haute pression du carburant, pressant les pistons (2) contre l'anneau polygonal (4), caractérisée en ce que la sollicitation des ressorts (7) des tiges des pistons est suffisamment élevée-compte tenu de la dynamique des pistons (2)-pour assurer, en cas de défaillance de la sollicitation due à la haute pression du carburant exercée par des pistons (2) de la pompe sur l'anneau polygonal (4), un équilibrage des forces s'exerçant sur l'anneau polygonal (4).  1. High pressure pump for a high pressure injection system of an internal combustion engine with air compression having several pump pistons which are distributed along the circumference of a polygonal ring (4) driven by an eccentric (3) and which each undergo the stress of a piston rod spring and that of the high fuel pressure, pressing the pistons (2) against the polygonal ring (4), characterized in that the stress springs (7) of the piston rods is high enough - taking into account the dynamics of the pistons (2) - to ensure, in the event of failure of the stress due to the high fuel pressure exerted by pistons (2) of the pump on the polygonal ring (4), a balancing of the forces exerted on the polygonal ring (4). 2. Pompe selon la revendication 1, caractérisé en ce que la sollicitation des ressorts (7) des tiges est environ quatre fois supérieure à celle nécessaire pour la dynamique des pistons.2. Pump according to claim 1, characterized in that the stress of the springs (7) of the rods is approximately four times greater than that necessary for the dynamics of the pistons.
FR0112085A 2000-09-23 2001-09-19 HIGH PRESSURE PUMP FOR A HIGH PRESSURE INJECTION SYSTEM OF AN INTERNAL COMBUSTION ENGINE WITH AIR COMPRESSION Expired - Fee Related FR2814502B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2000147188 DE10047188B4 (en) 2000-09-23 2000-09-23 High-pressure pump for a Hochdruckeinspritzsytem an air-compressing internal combustion engine

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FR2814502A1 true FR2814502A1 (en) 2002-03-29
FR2814502B1 FR2814502B1 (en) 2006-07-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120186559A1 (en) * 2011-01-24 2012-07-26 Denso Corporation Fuel pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042886A1 (en) 2008-10-16 2010-04-22 Robert Bosch Gmbh High-pressure pump arrangement for fuel injection system i.e. common-rail-injection system, of internal-combustion engine in motor vehicle, has piston transferring compressive force that attaches eccentric cam with radial cam element

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE491785C (en) * 1926-01-03 1930-02-13 Acro Akt Ges Fuel injection pump for internal combustion engines
GB533961A (en) * 1939-08-22 1941-02-25 Arthur John Rowledge Improvements in or relating to reciprocating pumps
US5230613A (en) * 1990-07-16 1993-07-27 Diesel Technology Company Common rail fuel injection system
DE19531873C1 (en) * 1995-08-30 1996-11-07 Daimler Benz Ag Fuel high pressure pump for internal combustion engine
US20010015200A1 (en) * 2000-02-18 2001-08-23 Katsumi Mori Fuel injection pump
EP1253313A1 (en) * 2000-01-31 2002-10-30 Bosch Automotive Systems Corporation Fuel injection pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160596B (en) * 1984-06-23 1987-04-29 Pitcraft Summit Ltd Pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE491785C (en) * 1926-01-03 1930-02-13 Acro Akt Ges Fuel injection pump for internal combustion engines
GB533961A (en) * 1939-08-22 1941-02-25 Arthur John Rowledge Improvements in or relating to reciprocating pumps
US5230613A (en) * 1990-07-16 1993-07-27 Diesel Technology Company Common rail fuel injection system
DE19531873C1 (en) * 1995-08-30 1996-11-07 Daimler Benz Ag Fuel high pressure pump for internal combustion engine
EP1253313A1 (en) * 2000-01-31 2002-10-30 Bosch Automotive Systems Corporation Fuel injection pump
US20010015200A1 (en) * 2000-02-18 2001-08-23 Katsumi Mori Fuel injection pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120186559A1 (en) * 2011-01-24 2012-07-26 Denso Corporation Fuel pump
US9109558B2 (en) * 2011-01-24 2015-08-18 Denso Corporation Fuel pump

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FR2814502B1 (en) 2006-07-28
DE10047188B4 (en) 2005-08-18
DE10047188A1 (en) 2002-04-11

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