WO2012048961A1 - Pompe haute pression pour un dispositif d'injection de carburant - Google Patents

Pompe haute pression pour un dispositif d'injection de carburant Download PDF

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Publication number
WO2012048961A1
WO2012048961A1 PCT/EP2011/065472 EP2011065472W WO2012048961A1 WO 2012048961 A1 WO2012048961 A1 WO 2012048961A1 EP 2011065472 W EP2011065472 W EP 2011065472W WO 2012048961 A1 WO2012048961 A1 WO 2012048961A1
Authority
WO
WIPO (PCT)
Prior art keywords
tappet
pressure pump
eccentric
pump
pump according
Prior art date
Application number
PCT/EP2011/065472
Other languages
German (de)
English (en)
Inventor
Alfons Schoetz
Markus Schetter
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201180049355.4A priority Critical patent/CN103154512B/zh
Priority to EP11754404.9A priority patent/EP2627903B1/fr
Publication of WO2012048961A1 publication Critical patent/WO2012048961A1/fr

Links

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
    • F04B1/0413—Cams
    • F04B1/0417—Cams consisting of two or more cylindrical elements, e.g. rollers
    • 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

Definitions

  • the present invention relates to a high pressure pump of a fuel injection device, which can be used in particular for a common rail injection device of an internal combustion engine.
  • the high-pressure pump comprises a pump or drive shaft, which is rotationally rigidly connected to an eccentric and is in operative connection with a pump element.
  • the one bucket tappet, an element piston and a plunger spring enclosing pump element is associated with a housing bore of an engine block.
  • the element piston which is drive-connected to the eccentric via the cup tappet and can be moved in a cylinder bore, delimits a pump working chamber connected to a suction valve and a high-pressure valve.
  • Such high-pressure pumps are used in motor vehicle construction in order to achieve a necessary volume flow and required fluid pressure for a common-rail system.
  • the high-pressure pump is subject to heavy loads, in particular mechanical stresses, so that high demands are placed on the material and on the construction.
  • the bucket tappet operatively connected to an eccentric or a cam track effects a conversion from the rotational movement of the drive shaft into an oscillating stroke movement of an element or pump piston.
  • the lifting movement of the element piston can be divided into a suction and compression stroke.
  • fuel is sucked into a pump working space via a suction valve.
  • the fuel is compressed and conveyed via an open high-pressure valve in a memory (rail).
  • DE 101 57 076 A1 discloses a plunger piston for a high-pressure pump with a plunger, which includes an axially and radially guided roller and a piston fixedly connected to the plunger. To guide the roller on the plunger it is provided with a roller shoe in which the roller is rotatable and inserted with an axial play.
  • a high-pressure pump which has a drive shaft with eccentric, which cooperates with a pump element. Between the element piston and the eccentric, a support element or a roller shoe is arranged, in which a rotatably mounted, rolling on the eccentric roller is inserted.
  • a relatively large amount of wear due to increased friction between the directly operatively connected components arises.
  • the increased friction affects the rotational movement of the roller, whereby slippage between the roller and the eccentric can occur and the wear increases.
  • the object of the invention is to provide a high-pressure pump with a simplified, robust and friction-optimized drive connection between the eccentric and the bucket tappet, which withstands high mechanical loads and is easy to produce.
  • a drive connection between the bucket tappet and the eccentric comprises a rotatably mounted on the eccentric race on which the bucket tappet is non-positively supported.
  • the tappet is thus drivingly connected via the rotatably mounted race indirectly to the eccentric.
  • the eccentric enclosing and a relative movement to the eccentric exercising race advantageously causes a decoupled drive connection or power transmission between the tappet and the eccentric.
  • This arrangement reduces the transverse force absorption of the bucket tappet and consequently advantageously reduced lateral or transverse forces can be realized by the bucket tappet in its guide on the housing bore.
  • the inventive concept provides a simplified and robust drive connection between the eccentric and bucket tappets, the advantageous heavy loads, in particular mechanical stresses withstand, which has a positive effect on the life.
  • the friction-optimized drive connection is also independent of friction conditions, which were to be considered in previous solutions between a bucket tappet and eccentric, for example between a roller and an eccentric.
  • the inventive robust drive connection is insensitive to different
  • a further advantage of the invention is that the drive connection according to the invention can be transferred both to high-pressure pumps with a 1-fold cam system or eccentric system and to high-pressure pumps with a 2-fold cam system.
  • the friction connection according to the invention advantageously results in reduced friction.
  • the invention can advantageously be realized a permanent drive connection between the eccentric and the bucket tappet, which can also be used for highly dynamic systems with correspondingly high pump pressures and pump speeds.
  • the concept according to the invention which can be implemented easily, ensures reliable, precise operation, combined with low wear, which results in an overall increase in efficiency.
  • a preferred embodiment of the invention provides that the bucket tappet on the drive side is associated with a designated also as a force receiving device sliding plate.
  • the preferably pressed into the cup tappet and fixed in position sliding plate is supported with a contact surface on the associated contact surface of the eccentric enclosing race, wherein the contact surfaces together form a contact zone.
  • the sliding plate is made of a material adapted to the given loads and lubricant conditions. To achieve a high wear resistance, it makes sense, for example, to produce the sliding plate made of hard metal or a ceramic material.
  • the tappet with integrated sliding plate is further characterized by a simplified and component-optimized
  • the tappet advantageously requires neither a position-oriented mounting position nor an anti-twist device, which simplifies assembly.
  • the inventive simplified and cost-optimized bucket tappet concept also offers a cost advantage over known solutions of tappets with roller shoe and integrated role.
  • the race is rotatably mounted on the eccentric shaft via a rolling bearing or sliding bearing.
  • a rolling bearing or sliding bearing By the use of commercial Wälz- or Plain bearings can be a robust, proven and inexpensive storage of the race on the eccentric shaft can be realized.
  • roller bearings are preferably cylindrical roller bearings, since the storage has to absorb any axial forces. Due to the small radial space required, it is preferable to use needle bearings for the bearing of the race.
  • Another particular embodiment of the invention is characterized in that at least one of the mutually facing contact surfaces of the sliding plate and the race is slightly convex or convex. This measure advantageously compensates for slight angular errors that can occur during production due to permissible position and / or shape tolerances.
  • the convexity also serves to reduce the contact area between the slide plate and the raceway to line contact, thereby advantageously reducing friction.
  • the invention further includes a coating of at least one contact surface with a friction-reducing material.
  • the high pressure pump designed as a plug-in pump is used as a structural unit with a plug-in pump body in a housing bore of the engine block.
  • a cylinder bore is introduced, which is intended to guide the element piston and at the same time forms the pump working space.
  • the structural design of the invention further includes different solutions for guiding the bucket tappet.
  • An outer guide of the tappet is preferred, in which a tappet body of the tappet is guided over a lateral surface in the housing bore of the engine block. This outer guide of the tappet prevents deformation of the guide of the element piston in the shaft portion.
  • a space-optimized arrangement of the plunger spring is also provided for the designed as a plug-pump high-pressure pump.
  • the plunger spring is supported on an integrated inside the cup tappet spring plate, wherein the plunger spring is guided over a greater length within the plunger body. The mutual spring end of the plunger spring is enclosed for guiding by a board of the plug-in pump body.
  • At least one preferably circumferential lubrication groove is introduced in a lateral surface of the tappet body, which are connected via associated passage bores with a plunger interior.
  • This measure has the effect that a lubricant, in particular the fuel delivered by the high-pressure pump, enters the annular gap which is established between the housing bore of the engine block and the lateral surface of the cup tappet.
  • the lubricant passes for cooling and lubrication in the defined by the race and the sliding plate contact zone of the drive connection between the eccentric and the bucket tappet.
  • the sliding plate of the tappet includes at least one flood hole.
  • Figure 1 is a sectional view of a high-pressure pump with a drive connection according to the invention between eccentric and bucket tappets.
  • a high-pressure pump 1 for a fuel injection device is one
  • Internal combustion engine is shown, which is preferably intended for a common rail injection system of a diesel internal combustion engine.
  • fuel under high pressure in a not shown in Fig. 1 memory (rail) is promoted. dert, from which the fuel is injected via fuel injectors targeted in associated combustion chambers of an internal combustion engine.
  • the high-pressure pump 1 forms a radial piston pump, which is used as a plug-in pump with a plug-in pump body 2 in an engine block 3 or housing.
  • the plug-in pump body 2 is adjoined by a low-pressure unit 4, which may also be referred to as a cylinder head.
  • a low-pressure unit 4 which may also be referred to as a cylinder head.
  • the drive shaft may be a shaft of the internal combustion engine, for example, the camshaft or a balancer shaft.
  • the eccentric 6 is surrounded by a race 9, which is rotatably mounted on the eccentric 6 via a roller bearing 10, in particular a needle bearing with cylindrical rolling elements 1 1 and which is drivingly connected to a tappet 13 of a pump element 8.
  • the pump element 8 comprises the bucket tappet 13, in which an element piston 12 or pump piston is held, as well as a tappet spring 14.
  • the cup tappet 13 is guided without rotation in a radially extending to the axis 5 of the drive shaft housing bore 16 of the engine block 3.
  • the cup tappet 13 is supported on the raceway 9 of the eccentric member 6 via a sliding plate 18 inserted in a form-fitting manner in a receptacle 17 of the cup tappet 5 and fixed in position.
  • In the operating state causes the rotating eccentric 6 in conjunction with the race 9, an oscillating movement of the tappet 13 and the associated element piston 12 which is guided in a cylinder bore 19 of a shaft portion 20 of the plug-in pump body 2.
  • the element piston 8 defines a pump working space 21 to which a suction valve 22 and a high-pressure valve 23 are assigned.
  • the suction valve 22 opens, whereby the pump working chamber 21 fuel from the low pressure unit 4 can be supplied.
  • a delivery stroke (upward movement) of the element piston 8 leads to the closure of the suction valve 22 and a fuel compression, before the fuel on the the function of a
  • Non-return valve exerting high-pressure valve 23 is conveyed in a further fuel line to a high-pressure accumulator (Rail).
  • the one restoring force on the tappet 13 triggering plunger spring 14 is supported between the plug-in pump body 2 and a spring plate 24 of the tappet 13 and causes a frictional support of the tappet 13 on the Running ring 9.
  • the plunger spring 14 surrounds the shaft portion 20 of the plug-in pump body 2, wherein a first spring end of the plunger spring 14 is enclosed by a board 25 of the plug-in pump body 2 and the further entering the tappet 13, supported on the spring plate 24 spring end on the outside of the plunger body 15 is enclosed.
  • the eccentric 6 enclosing raceway 9 is supported via a convex, convex contact surface 27 on a correspondingly shaped counter surface, the contact surface 28 of the sliding plate 18 of the tappet 13.
  • a friction-reducing coating at least one contact surface 27, 28 is additionally suitable.
  • the tappet 13 shows the tappet 13 as a single part in an enlarged view and illustrates further details.
  • the used in the tappet 13, for supporting the plunger spring 14 certain spring plate 24 simultaneously causes a support of the element piston 12 on the tappet 13.
  • the element piston 12 is inserted in a central opening 26 of the spring plate 24 and through an opening 26 cross-end board 35 secured. Since the plunger body 15 are guided in the engine block 3 and the element piston 12 in the shaft portion 20 and thus in separate components, the element piston 12 is preferably performed with a small angular error compensating clearance in the opening 26 of the spring plate 24.
  • Lubricant also in the direction of the eccentric 6 and applied for lubrication and cooling a contact zone 33 (Fig. 1) between the raceway 9 and the slide plate 18.
  • a plurality of flood bores 34 are introduced in the slide plate 18, which allow a flow of lubricant to targeted to lubricate and cool the components of the contact zone 33.

Abstract

La présente invention concerne une pompe haute pression (1) d'un appareil d'injection de carburant, qui peut en particulier être utilisée pour un appareil d'injection à rampe commune d'un moteur à combustion interne. La pompe haute pression (1) comprend un arbre de pompe ou d'entraînement, relié solidaire en rotation à un excentrique (6) ainsi qu'un élément de pompe (8). L'élément de pompe (8) comprenant un poussoir creux (13), un piston (12) ainsi qu'un ressort (14) de poussoir est placé dans un trou (16) dans le carter d'un bloc moteur (3). Le piston creux (13) soumis à l'action du ressort (14) de poussoir est associé au piston (12) à course mobile guidé dans un trou cylindrique (19) d'une section d'arbre (20) qui délimite un espace de travail (21) de la pompe relié à une soupape d'aspiration (22) et une soupape haute pression (23). Un assemblage d'entraînement entre le piston creux (13) et l'excentrique (6) comprend une bague de roulement (9) logée de manière rotative sur l'excentrique (6), sur laquelle est appuyée à force la plaque de glissement (18) du piston creux (13).
PCT/EP2011/065472 2010-10-15 2011-09-07 Pompe haute pression pour un dispositif d'injection de carburant WO2012048961A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180049355.4A CN103154512B (zh) 2010-10-15 2011-09-07 用于燃料喷射装置的高压泵
EP11754404.9A EP2627903B1 (fr) 2010-10-15 2011-09-07 Pompe haute pression pour un dispositif d'injection de carburant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010042484.6 2010-10-15
DE201010042484 DE102010042484A1 (de) 2010-10-15 2010-10-15 Hochdruckpumpe für eine Kraftstoffeinspritzvorrichtung

Publications (1)

Publication Number Publication Date
WO2012048961A1 true WO2012048961A1 (fr) 2012-04-19

Family

ID=44583058

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/065472 WO2012048961A1 (fr) 2010-10-15 2011-09-07 Pompe haute pression pour un dispositif d'injection de carburant

Country Status (4)

Country Link
EP (1) EP2627903B1 (fr)
CN (1) CN103154512B (fr)
DE (1) DE102010042484A1 (fr)
WO (1) WO2012048961A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107110092B (zh) * 2014-12-24 2020-05-05 罗伯特·博世有限公司 用于将燃料、优选柴油供送至内燃机的泵单元
DE102015111025A1 (de) 2015-07-08 2017-01-12 Volkswagen Ag Selbstgeschmierte Hochdruckpumpe
DE102016203768B4 (de) * 2015-11-12 2017-10-26 Robert Bosch Gmbh Pumpe, insbesondere Hochdruckpumpe eines Kraftstoffeinspritzsystems, mit einem Montageverbund von Stößel-Baugruppe und Pumpenzylinderkopf, insbesondere durch eine Rastverbindung zwischen Federteller und Stößelkörper
CN107939628B (zh) * 2017-12-26 2023-07-18 浙江三浪润滑科技有限公司 一种多头径向柱塞泵及其使用方法
DE102018120777A1 (de) * 2018-08-24 2020-02-27 Volkswagen Aktiengesellschaft Hochdruckpumpe umfassend eine Druckumlaufschmierung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315826A1 (de) * 1993-05-12 1994-11-17 Teves Gmbh Alfred Aggregat bestehend aus einem Elektromotor und einem anzutreibenden Element
DE19907311A1 (de) 1999-02-22 2000-08-31 Bosch Gmbh Robert Hydraulikpumpeneinheit
WO2003014569A1 (fr) * 2001-08-08 2003-02-20 Crt Common Rail Technologies Ag Pompe d'alimentation haute pression
DE10157076A1 (de) 2001-11-21 2003-05-28 Bosch Gmbh Robert Stößelkolben
US20030110937A1 (en) * 2001-11-29 2003-06-19 Johannes Lang Radial piston pump
WO2006037676A1 (fr) * 2004-10-06 2006-04-13 Siemens Aktiengesellschaft Pompe a piston radial et poussoir a galet
EP1906011A2 (fr) * 2006-09-14 2008-04-02 VDO Automotive AG Pompe à fluide, en particulier pompe à carburant haute pression pour systèmes d'injection de moteurs à combustion interne
DE102006060680A1 (de) * 2006-12-21 2008-06-26 Schaeffler Kg Wälzlager für eine Radial-Kolbenpumpe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09303252A (ja) * 1996-05-13 1997-11-25 Nissan Motor Co Ltd 油圧ポンプ装置
IT1289796B1 (it) * 1996-12-23 1998-10-16 Elasis Sistema Ricerca Fiat Perfezionamenti ad un dispositivo a pompa per l'alimentazione del carburante da un serbatoio ad un motore a combustione interna.
DE102006041673A1 (de) * 2006-02-20 2007-08-23 Robert Bosch Gmbh Hochdruckpumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315826A1 (de) * 1993-05-12 1994-11-17 Teves Gmbh Alfred Aggregat bestehend aus einem Elektromotor und einem anzutreibenden Element
DE19907311A1 (de) 1999-02-22 2000-08-31 Bosch Gmbh Robert Hydraulikpumpeneinheit
WO2003014569A1 (fr) * 2001-08-08 2003-02-20 Crt Common Rail Technologies Ag Pompe d'alimentation haute pression
DE10157076A1 (de) 2001-11-21 2003-05-28 Bosch Gmbh Robert Stößelkolben
US20030110937A1 (en) * 2001-11-29 2003-06-19 Johannes Lang Radial piston pump
WO2006037676A1 (fr) * 2004-10-06 2006-04-13 Siemens Aktiengesellschaft Pompe a piston radial et poussoir a galet
EP1906011A2 (fr) * 2006-09-14 2008-04-02 VDO Automotive AG Pompe à fluide, en particulier pompe à carburant haute pression pour systèmes d'injection de moteurs à combustion interne
DE102006060680A1 (de) * 2006-12-21 2008-06-26 Schaeffler Kg Wälzlager für eine Radial-Kolbenpumpe

Also Published As

Publication number Publication date
CN103154512B (zh) 2017-03-01
EP2627903A1 (fr) 2013-08-21
EP2627903B1 (fr) 2016-07-13
DE102010042484A1 (de) 2012-04-19
CN103154512A (zh) 2013-06-12

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