EP2711547B1 - Agencement de piston d'une pompe haute pression - Google Patents

Agencement de piston d'une pompe haute pression Download PDF

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Publication number
EP2711547B1
EP2711547B1 EP12185589.4A EP12185589A EP2711547B1 EP 2711547 B1 EP2711547 B1 EP 2711547B1 EP 12185589 A EP12185589 A EP 12185589A EP 2711547 B1 EP2711547 B1 EP 2711547B1
Authority
EP
European Patent Office
Prior art keywords
plunger
end part
multitude
flat end
bearing balls
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
EP12185589.4A
Other languages
German (de)
English (en)
Other versions
EP2711547A1 (fr
Inventor
Cristian Adrian Dr. Rosu
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.)
Vitesco Technologies GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP12185589.4A priority Critical patent/EP2711547B1/fr
Publication of EP2711547A1 publication Critical patent/EP2711547A1/fr
Application granted granted Critical
Publication of EP2711547B1 publication Critical patent/EP2711547B1/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
    • 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
    • F04B1/0408—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
    • F04B1/0404—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
    • F04B1/0435—Arrangements for disconnecting the pistons from 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
    • 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
    • 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
    • F04B9/045—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 eccentrics

Definitions

  • the invention relates to a plunger arrangement for a high-pressure pump, particularly a plunger arrangement for a high-pressure fuel pump for use in an internal combustion engine.
  • the fuel is delivered by means of a high pressure pump from a fuel tank to a fuel rail which serves as a storage reservoir for the fuel.
  • the fuel is under high pressure in the fuel rail (or common rail) and can be injected directly into the cylinders via injection valves connected to the rail.
  • Fuel pumps for example common rail pumps, need to be cost effective and durable.
  • the sliding common rail pump mechanism is made either of a tappet, a spring seat and a plunger or of a footed plunger. These pumping mechanisms slide on a component named rider.
  • a variant of a hydro-dynamic footed plunger is the hydrostatic footed plunger.
  • the scuffing issue on the foot is eliminated due to the hydrostatic lifting film that separates the foot from the rider during the pumping phase.
  • the fluid under pressure is brought straight from the pumping chamber via a channel manufactured along the plunger.
  • the flow used to lift the plunger foot can reduce the volumetric efficiency of the pump. A lower volumetric efficiency will negatively affect the overall efficiency of the pump leading to increase in power consumption.
  • DE 10 2011 003 771 A1 discloses a high pressure fuel pump, wherein a tappet and a piston are driven by a shaft comprising a cam, the tappet comprising a plurality of rolling bodies rolling in tracks provided on the cam.
  • a high pressure fuel pump in which a piston is driven by a shaft comprising a cam, wherein between the cam and the piston a rolling body is arranged.
  • US 2006/0062677 A1 discloses a high pressure fuel pump, wherein a piston is driven by sliding on a rider which is provided on a crank drive.
  • a plunger arrangement for a high-pressure pump is provided to slide on a flat surface of a rider of a drive shaft.
  • the plunger arrangement comprises a plunger with a flat end part.
  • the plunger arrangement comprises a multitude of bearing balls that are arranged along the flat end part.
  • the plunger comprises a ball holder for coupling the multitude of bearing balls with the flat end part.
  • the ball holder is coupled to the plunger such that the bearing balls are arranged between the flat end part and the ball holder.
  • the ball holder is coupled to the plunger such that each bearing ball projects partly over the ball holder for coupling the plunger with the rider of the driveshaft.
  • the multitude of bearing balls coupled to the flat end part of the plunger by the ball holder provides a ball bearing for the plunger.
  • the bearing balls are in contact with a cam of the driveshaft.
  • the cam comprises a flat part, the rider.
  • the number of the bearing balls of the multitude of bearing balls and the size of the bearing balls are calculated to obtain a low stress on the balls.
  • the plunger arrangement is durable.
  • the bearing balls are cost effective.
  • the ball holder is made from steel.
  • the plunger arrangement does not require special tooling. Therefore, the plunger arrangement is cost effective. Due to the little friction between the plunger, the bearing balls and the rider, the internal heat generation is low.
  • the contact area between the plunger and the rider is extended and thus an additional pressure capability is provided. Further, the low friction between the plunger and the rider reduces the driving torque and the components' wear. Therefore, the plunger arrangement is usable for stop-start engine technology. According to aspects, the heat generation in the cambox is reduced by 10 to 20 % °C.
  • the plunger comprises a multitude of notches at the flat end part facing the ball holder.
  • Each bearing ball of the multitude of bearing balls is arranged partly in one notch of the multitude of notches.
  • the plunger arrangement comprises a coating on the flat end part to reduce the friction between the flat end part and the bearing balls. Thus, the wear is further minimized.
  • the plunger arrangement comprises a fluid channel that reaches through the plunger to the flat end part.
  • the fluid channel is used for additional lubrication of the contact area between the multitude of bearing balls and the flat end part.
  • a plunger arrangement 100 comprises a plunger 112.
  • the plunger comprises an elongated board and a flat end part 101.
  • the flat end part faces a driveshaft 110.
  • the driver 110 comprises a cam with a rider 113 with a flat surface 114.
  • the flat end part 101 and the surface 114 are arranged opposite each other.
  • bearing balls 102 are arranged between the flat end part 101 and the surface 114.
  • the bearing balls 102 each are free to rotate relatively to the plunger 112 and the rider 113.
  • the bearing balls 102 are coupled to the plunger 112 by a ball holder 103.
  • the ball holder comprises a multitude of openings 106. Each bearing ball 102 is positioned in one of the openings 106 such that the bearing balls 102 extend through the ball holder 103.
  • the openings 106 comprise a smaller diameter than the diameter of the bearing balls 102.
  • the ball holder 103 comprises a first part 104 that is arranged between the flat end part 101 and the surface 114.
  • the openings 106 are located at the part 104.
  • the ball holder 103 comprises one or more further parts 115 that are aligned across the part 104 and are in contact with the plunger 112 to couple the ball holder 103 with the plunger 112.
  • a spring 109 is coupled with the flat end part 109 on a side opposite the bearing balls 102.
  • the spring 109 is arranged to extend a spring force on the plunger 112 in the direction of the driveshaft 110.
  • the plunger arrangement 100, the spring 109 and the driveshaft 110 are part of a common rail fuel pump of radial pump design.
  • the driveshaft 110 is engine-driven and drives the rider 113 in use.
  • the plunger 112 is caused to reciprocate within a bore of the pump housing.
  • the plunger 112 causes pressurization of fuel within the pump chamber defined at one end of the bore.
  • the delivery of fuel from the pump chambers to a common high-pressure supply line is controlled by means of delivery valves.
  • the high-pressure line supplies fuel to a common rail or other accumulator volume for delivery to downstream injectors of a common rail fuel system.
  • the heat generated in use is reduced. Further, the pressure capability is increased. Therefore, the pump can be downsized and fitted on small engines. Further, the friction between the plunger 112 and the rider 113 is reduced and thus, the driving torque and the components' wear is reduced. Therefore, the heat generation is reduced by 10 to 20 % °C according to embodiments with respect to conventional footed plungers. At the same time, the coupling by the multitude of bearing balls 112 provides an additional pressure capability. According to aspects, the plunger arrangement is operated without forced cooling through the bearings.
  • a surface 111 of the plunger 112 facing the driveshaft 110 comprises a coating 107.
  • the balls 102 are arranged along the surface 111 and the coating 107 further reduces the friction between the balls 102 and the plunger 112.
  • the surface 111 is smooth and on one level.
  • FIG. 2 schematically shows the plunger 112 according to further embodiments. In contrast to the plunger 112 of FIG. 2 , the surface 111 is not smooth.
  • the surface 111 comprises a multitude of notches 105. During operation, each bearing ball 102 is arranged in one notch of the notches 105. Thus, the high of the pump and the contact stress is reduced.
  • the bearing balls 102 each are partly arranged in the plunger 112.
  • FIG. 3 schematically shows the plunger arrangement 100 according to further embodiments.
  • the plunger 112 comprises a fluid channel 108.
  • the fluid channel 108 reaches through the plunger to the flat end part and provides a fluid communication through the plunger 112 to the bearing balls 102. Additional lubrication is brought to the area of the bearing balls 102 through the fluid channel 108.
  • more than one fluid channel 108 is provided in the plunger 112 for additional lubrication.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (5)

  1. Agencement de piston (100) pour une pompe à haute pression, l'agencement de piston (100) étant conçu pour coulisser sur une surface plane (114) d'un coulisseau (113) d'un arbre de transmission (110), comprenant :
    un piston (112) avec une partie d'extrémité plane (101), l'agencement de piston étant caractérisé par :
    une multitude de billes de roulement (102) qui sont disposées le long de la partie d'extrémité plane (101),
    un support de bille (103) pour accoupler la multitude de billes de roulement (102) avec la partie d'extrémité plane (101), le support de bille (103) étant accouplé au piston (112) de sorte que les billes de roulement (102) soient disposées entre la partie d'extrémité plane (101) et le support de bille (103) et chaque bille de roulement (102) fasse partiellement saillie sur le support de bille (103) pour accoupler le piston (112) avec le coulisseau (113) de l'arbre de transmission (110).
  2. Agencement de piston (100) selon la revendication 1, le piston (112) comprenant une multitude d'encoches (105) dans la partie d'extrémité plane (101) faisant face au support de bille (103), chaque bille de roulement (102) de la multitude de billes de roulement (102) étant disposée dans une encoche (105) de la multitude d'encoches (105).
  3. Agencement de piston (100) selon la revendication 1 ou 2, le support de bille (103) comprenant une multitude d'ouvertures (106), les ouvertures (106) comprenant chacune un diamètre inférieur au diamètre des billes de roulement (105), chaque bille de roulement (105) de la multitude de billes de roulement (105) étant disposée dans une ouverture (106) de la multitude d'ouvertures (106).
  4. Agencement de piston (100) selon l'une des revendications 1 à 3, comprenant un revêtement (107) sur la partie d'extrémité plane (101) pour réduire la friction entre la partie d'extrémité plane (101) et les billes de roulement (102).
  5. Agencement de piston (100) selon l'une des revendications 1 à 4, comprenant un canal de fluide (108) qui traverse le piston (112) jusqu'à la partie d'extrémité plane (101).
EP12185589.4A 2012-09-24 2012-09-24 Agencement de piston d'une pompe haute pression Not-in-force EP2711547B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12185589.4A EP2711547B1 (fr) 2012-09-24 2012-09-24 Agencement de piston d'une pompe haute pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12185589.4A EP2711547B1 (fr) 2012-09-24 2012-09-24 Agencement de piston d'une pompe haute pression

Publications (2)

Publication Number Publication Date
EP2711547A1 EP2711547A1 (fr) 2014-03-26
EP2711547B1 true EP2711547B1 (fr) 2019-06-05

Family

ID=46970065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12185589.4A Not-in-force EP2711547B1 (fr) 2012-09-24 2012-09-24 Agencement de piston d'une pompe haute pression

Country Status (1)

Country Link
EP (1) EP2711547B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108457853B (zh) * 2018-04-10 2019-08-20 中国北方发动机研究所(天津) 一种高压泵柱塞自增压润滑结构

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2288884A1 (fr) * 1974-04-19 1976-05-21 Bennes Marrel Pompe, notamment pour les circuits d'huile
JPH1030525A (ja) * 1996-07-16 1998-02-03 Denso Corp 高圧サプライポンプ
JP2006514195A (ja) * 2003-02-11 2006-04-27 ガンサー−ハイドロマグ アーゲー 高圧ポンプ
DE102005025869B4 (de) * 2005-06-06 2017-04-06 Robert Bosch Gmbh Geräuscharme Kolbenpumpe
DE102011003771A1 (de) * 2011-02-08 2012-08-09 Robert Bosch Gmbh Nockentrieb für eine Hochdruckpumpe sowie Hochdruckpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2711547A1 (fr) 2014-03-26

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