WO2012152595A1 - Pompe, en particulier pompe haute pression d'un système d'injection de carburant - Google Patents

Pompe, en particulier pompe haute pression d'un système d'injection de carburant Download PDF

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Publication number
WO2012152595A1
WO2012152595A1 PCT/EP2012/057662 EP2012057662W WO2012152595A1 WO 2012152595 A1 WO2012152595 A1 WO 2012152595A1 EP 2012057662 W EP2012057662 W EP 2012057662W WO 2012152595 A1 WO2012152595 A1 WO 2012152595A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
camshaft
roller
elevation
contour
Prior art date
Application number
PCT/EP2012/057662
Other languages
German (de)
English (en)
Inventor
Gerhard Meier
Matthias Greiner
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
Publication of WO2012152595A1 publication Critical patent/WO2012152595A1/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
    • F04B1/0426—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
    • F04B1/0408—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
    • F04B1/0435—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

Definitions

  • the invention relates to a pump, in particular high-pressure pump of a fuel injection system, with a camshaft having at least one camshaft, with the cam, a roller of a movable housing in a roller tappet cooperates and a rotational movement of the pump camshaft in a translational movement of the roller tappet implements.
  • Such a pump is known from DE 10 2008 001 718 A1.
  • This pump avoids the disadvantage that in a conventional arrangement of a Pumpenno- ckenwelle to a roller of a roller tappet and a pump piston all tolerances and games must be compensated by the pump piston.
  • this pump should avoid the disadvantage that the transverse forces acting unfavorably on the roller in such an arrangement, so that the roller is always applied depending on the tolerance positions on one of its two stops and thus exposed to increased wear or caused. This is to be avoided in that means are provided in this pump to achieve an inclination of the surface of the pump piston to a contact surface of the roller with the surface of the cam.
  • the roller can be selectively moved from one of their attacks to the other.
  • the illustrated embodiment involves the risk that the roller is only in a very close-fitting line contact with the cam of the pump camshaft, so that in this contact line a very high load.
  • the invention has for its object to provide a pump in which wear of a cooperating with the pump cam shaft roller tappet relative to a housing guide is at least reduced. Disclosure of the invention
  • the pump camshaft has one of the pump camshaft upon impetus to an axial bearing a counter-rotating axial force enforcing device.
  • the pump camshaft is repeatedly moved back and forth between the two axial end positions.
  • This reciprocation of the pump camshaft is also transmitted to the roller of the roller pusher so that the roller can not abut continuously on one side of a pusher body in which the roller is inserted together with a roller shoe accommodating the roller.
  • the roller can transmit at least no significant force F ax .
  • the plunger body rests in the housing guide and the pump camshaft on the axial bearing; which may be a housing bearing or a flange bearing or the pump housing or a flange itself, is applied.
  • the oppositely directed axial movement of the pump camshaft and the roller is assisted by the fact that during a delivery stroke of the pump piston, high pressure forces act on the pump piston through the medium to be delivered, while in the subsequent suction stroke of the pump piston no pressure forces act on the pump piston through the medium.
  • the device is a cooperating with a survey wave-annular contour.
  • This wave-ring-shaped contour is designed in the manner of a wave-shaped spring ring with at least one elevation and a depression on the circumference of the contour. The increase and the depression act together in a rotational movement with the survey.
  • the wave-annular contour is arranged on the pump camshaft or on the bearing or the pump housing and / or the flange.
  • the wave-annular contour is arranged on the pump camshaft, while the elevation is arranged on the bearing or the pump housing and / or the flange.
  • the wave-annular Kontor may be a non-rotatably mounted on the pump camshaft ring, but preferably the wave-annular contour during machining of the camshaft in an axial surface, in particular during a rotation process, is incorporated.
  • the wave-annular contour is incorporated on both axial ends, for example, following the or the cams in the pump camshaft.
  • the contour on its circumference on two alternating elevations and depressions.
  • the elevations are arranged with respect to the cams so that they are arranged in the region of the cam tip, that is to say the position corresponding to the top dead center of the pump piston, while the depression is arranged in the region of the outlet of the cam in the base circle of the cam , This point corresponds to the bottom dead center of the pump piston.
  • the number of increases corresponds to the number of cams distributed on the camshaft. The transition between a recess and an increase takes place continuously, so that when the pump camshaft is mounted on an axial bearing, the pump camshaft is moved at a low axial speed. Since the storage of the pump camshaft is lubricated anyway, the lubrication of the device is straightforward and requires no additional utilities.
  • the dimension between an elevation and a depression is between 0.05 mm and 0.25 mm, in particular 0.15 mm. This area or this specific measure has proven to be particularly suitable.
  • the survey extends over a circumferential angle of 5 ° to 35 °, in particular over a circumferential angle of 20 °.
  • An elevation designed in this way interacts advantageously with the wave-shaped contour designed according to the invention.
  • the pump camshaft runs in a central region of the axial play and is moved onto the roller in a central region between the tappet body. Only in the event that the pump camshaft is moved out of this ideal center position, the device according to the invention is used.
  • the survey is formed by a cooperating with the contour and the survey receiving relief groove. By this configuration, no additional space for receiving the device according to the invention is needed.
  • the collection of a used in the camp or the pump camshaft insert, in particular a pin is formed. This pin is particularly effective when the bearing is designed as aluminum or die-cast, applied and the pin can be made of a correspondingly more wear-resistant material, such as steel.
  • the pump is a high-pressure pump of a fuel injection system for an internal combustion engine, is conveyed with the fuel at a pressure from 1,600 bar in a high-pressure accumulator.
  • FIG. 1 shows a perspective sectional view of a portion of a pump
  • FIG. 2 shows a sectional view of a pump camshaft
  • FIG. 2a shows a perspective view of a pump camshaft according to FIG. 2
  • FIG. 2b shows a section A-A according to FIG. 2
  • FIG. 2c shows a section B-B according to FIG. 2,
  • Figure 3a is a plan view of a storage according to the invention according to Figure 3 and
  • FIG. 3b shows a detail view from a plan view according to FIG.
  • FIG. 1 shows a section of a pump, which is in particular a high pressure pump of a fuel injection system for an internal combustion engine, is conveyed with the fuel at a pressure from 1 .600 bar in a high-pressure accumulator.
  • the fuel to be delivered from a tank of a low-pressure pump is supplied to the high-pressure pump and the high-pressure pump nachzu specialnde the fuel in the high-pressure accumulator of a pump piston 1 which is movable in a pump cylinder 2, from a pump working chamber via a check valve and a high-pressure line in the High-pressure accumulator pumped.
  • the fuel is supplied to the pump working chamber via an additional measuring unit and a suction valve from a pump interior 3.
  • Pump interior 3 the fuel is introduced from the low-pressure pump.
  • the pump interior 3 is formed in a pump housing 4, wherein in the pump housing 4, a pump camshaft 5 is mounted in a housing bearing 6 and a flange bearing 7.
  • the pump camshaft 5 has two opposing cams 8, which are arranged in the fuel-filled pump interior 3.
  • a roller 9 of a roller tappet 10 runs on the cam track formed by the cams 8.
  • the roller 9 is rotatably mounted in a roller shoe 1 1, wherein the roller shoe 1 1 is used together with the roller 9 in a plunger body 12 against an inner ring flange 13 fitting.
  • the roller shoe 1 1 and the roller 9 protrude so far into the plunger body 12 in that the roller 9 can interact axially with the inner wall of the plunger body 12. If the roller 9 moves axially against the plunger body 12, the roller 9 can exert a force F ax on the plunger body 12.
  • the pump piston 1 has a pump piston foot 14, which is supported on the roller shoe 1 1 and which is pressed by a pump spring 15 and a spring washer 16 against the roller shoe 1 1. Accordingly, the pump spring 15 is supported on the spring washer 16 cooperating with the pump piston foot 14 and / or the inner ring flange 13 and a pump cylinder head formed integrally with the pump cylinder 2.
  • the roller tappet 10 which is translationally movable in a housing guide 17 up and down, on the one hand pressed by the pump spring 15 against the running surface of the cam 8 of the pump camshaft 5 and on the other hand of the rotating camshaft 5 according to the cam contour and moved off.
  • the roller 9 may run up the cam track of the pump camshaft 5 obliquely and the roller 9 moves axially to its longitudinal axis.
  • a predetermined axial clearance is necessary, so that in the rising flank of the cam 8 at a given tappet torsion ß the roller 9 is not immediately on the plunger body 12 to the plant and can generate wear. Wear can only be generated if a force F ax can be transmitted to the tappet body 12. This is only possible if the plunger body 12 rests in the housing guide 17 and the pump camshaft 5 rests against the flange bearing 7 or on the housing bearing 6. This is the case when the pump camshaft 5 has undergone its axial play. In order to avoid this, the pump camshaft 5 has a device which forces a counter-axial movement when the pump camshaft 5 starts against the housing bearing 6 or the flange bearing 7 of the pump camshaft 5. This device is described in detail in FIGS. 2 and 3.
  • FIG. 2 shows a cross section through the pump camshaft 5, wherein in a start-up shoulder 18 of the pump camshaft 5 adjacent or directly adjacent to two opposing cam 8, a wave-annular contour 19 is incorporated.
  • the wave-annular contour 19 has two opposite elevations 20, which are each arranged in the region of the cam tip of the cam 8. Furthermore, the contour
  • FIG. 2 a shows a perspective view of the annular ring-shaped contour 21 on the pump camshaft 5.
  • Figures 2b and 2c show the sections indicated in Figure 2 A-A and B-B through the pump camshaft 5 and indicate the maximum of the measure between see an increase 20 and a recess 21 which is defined by the distance x.
  • the dimension x is 0.15 mm.
  • FIG. 3 shows a flange 25 with a flange bearing 7, in which the pump camshaft 5 is used with the associated storage area.
  • an elevation 22 acts on the flange 25.
  • the elevation 22 is formed by an undercut 23, which is incorporated in the pump housing 4 or in the flange 25 both in the area of the housing bearing 6 and the flange stop 7, via an NEN ring circumference of 340 ° is formed.
  • no undercut 23 is present and the basic contour of the flange 25 and the pump housing 4 forms the increase 22.
  • the wave-shaped contour 19 projects into the undercut 23 and only if an increase 20 on the Survey 22, the pump camshaft 5 is moved axially.
  • the elevation 22 has a preferred dimension of 0.05 mm, so that the pump camshaft 5 is moved axially by a maximum of 0.2 mm.
  • FIG. 3 a shows a top view of the flange 25 with the elevation 22, which is produced by removing material over a circumference of 340 ° on the flange 25 in the form of an undercut 23.

Landscapes

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

Abstract

L'invention concerne une pompe, en particulier une pompe haute pression d'un système d'injection de carburant, dotée d'un arbre à came de pompe (5) comportant au moins une came (8). Un galet de roulement (9) d'un poussoir à galet (10) mobile dans un guidage de boîtier (17) lors d'une rotation de l'arbre à came de pompe (5) roule sur la came (8) et convertit un déplacement rotatif de l'arbre à came de pompe (5) en un déplacement en translation du poussoir à galet (10). Avec la pompe selon l'invention, une usure d'un poussoir à galet (10) coopérant avec l'arbre à came de pompe (5) par rapport à un guidage de boîtier (17) est au moins réduite. Ceci est atteint par le fait que l'arbre à came de pompe (5) comporte un dispositif lui imposant un déplacement axial inverse lorsqu'il est en appui contre un palier axial.
PCT/EP2012/057662 2011-05-12 2012-04-26 Pompe, en particulier pompe haute pression d'un système d'injection de carburant WO2012152595A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011075691.4 2011-05-12
DE201110075691 DE102011075691A1 (de) 2011-05-12 2011-05-12 Pumpe, insbesondere Hochdruckpumpe eines Kraftstoffeinspritzsystems

Publications (1)

Publication Number Publication Date
WO2012152595A1 true WO2012152595A1 (fr) 2012-11-15

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ID=46017862

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/057662 WO2012152595A1 (fr) 2011-05-12 2012-04-26 Pompe, en particulier pompe haute pression d'un système d'injection de carburant

Country Status (2)

Country Link
DE (1) DE102011075691A1 (fr)
WO (1) WO2012152595A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025924A1 (de) * 2006-06-02 2007-12-06 Siemens Ag Fluidpumpe mit Rollenstößel
DE102006048722A1 (de) * 2006-10-16 2008-04-17 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoffhochdruckpumpe, mit Rollenstößel
DE102009001315A1 (de) * 2009-03-04 2010-09-09 Robert Bosch Gmbh Kolbenpumpe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001718A1 (de) 2008-05-13 2009-11-19 Robert Bosch Gmbh Hochdruckkraftstoffpumpe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025924A1 (de) * 2006-06-02 2007-12-06 Siemens Ag Fluidpumpe mit Rollenstößel
DE102006048722A1 (de) * 2006-10-16 2008-04-17 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoffhochdruckpumpe, mit Rollenstößel
DE102009001315A1 (de) * 2009-03-04 2010-09-09 Robert Bosch Gmbh Kolbenpumpe

Also Published As

Publication number Publication date
DE102011075691A1 (de) 2012-11-15

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