WO2012156137A1 - Pompe à piston - Google Patents

Pompe à piston Download PDF

Info

Publication number
WO2012156137A1
WO2012156137A1 PCT/EP2012/055363 EP2012055363W WO2012156137A1 WO 2012156137 A1 WO2012156137 A1 WO 2012156137A1 EP 2012055363 W EP2012055363 W EP 2012055363W WO 2012156137 A1 WO2012156137 A1 WO 2012156137A1
Authority
WO
WIPO (PCT)
Prior art keywords
roller
pump
plunger body
piston pump
piston
Prior art date
Application number
PCT/EP2012/055363
Other languages
German (de)
English (en)
Inventor
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 WO2012156137A1 publication Critical patent/WO2012156137A1/fr

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
    • F02M59/02—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
    • 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 piston pump, comprising a pump housing, in which a
  • Pump camshaft is rotatably mounted, which cooperates via a translationally movable in the pump housing mounted roller tappet with a pump piston, wherein the roller tappet has a movable housing guide in a plunger body, in which a roller receiving roller shoe is used, and wherein the roller with a cam track of the pump camshaft interacts.
  • Such a pump is known from DE 10 2008 001 718 A1.
  • This pump avoids the disadvantage that in a conventional arrangement of a pump camshaft 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 act 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 piston pump to achieve a defined fixed set inclined position of the surface of the pump piston to a contact surface of the roller with the surface of the cam.
  • the invention has for its object to improve the wear behavior of a piston pump.
  • roller tappet is tiltable by a tilt angle ⁇ about a longitudinal axis through the roller, wherein the tilt angle ⁇ in a further refinement between ⁇ 0.08 ° and ⁇ 0.22 °, in particular ⁇ 0.15 ° is.
  • This embodiment is based on the finding that the roller tappet is round and also serves to absorb transverse forces from the cam drive, in that the roller tappet is supported in a housing guide of the pump housing.
  • the ram assembly is characterized by the frictional forces between a pump spring and a pump cylinder head, as well as the pump spring and a spring washer at bottom dead center and top
  • Radius of curvature R changes, but it can lead to small rotations (0 ° to 3 ° by the angle ß) of the roller tappet by the torsional moment of the pump spring or by deviations of the orthogonality of the roller tappet to the cam axis, which in a stiff role (due to mixed friction ratios between - see the role and the roller shoe) can also increase. These rotations occur because the roller tappet, by a force of a pump piston and the combination of cam pitch angle ⁇ and curvature radius R of the cam, attempts to establish line contact between the roller and the cam track.
  • the game of the roller tappet is dimensioned with a predetermined nominal size in the housing guide, so that the wear in the pump housing by cavitation and the
  • the housing guide relative to the roller tappet a game of 60 ⁇ to 160 ⁇ in Nockenwellenachsraum.
  • the effect desired according to the invention is achieved. Through the slot of the degree of freedom of the roller tappet in the camshaft axis is increased so that the roller in any tolerance position of the piston pump can make the line contact with the camshaft by tilting by an angle ⁇ and for no rotation by an angle ß needs.
  • the small play is maintained so as not to impair the wear behavior of the roller tappet in the pump housing (due to a transverse force and / or cavitation).
  • the measure of the slot is a maximum of 160 ⁇ (normally) minus the standard ram play of 30 ⁇ to 60 ⁇ .
  • This game refers to a roller tappet with a diameter in the range of 20 mm to 36 mm, in particular 28 mm. This mating invention has proven to be particularly advantageous.
  • the plunger body on a réelleringflansch on which the roller shoe is supported and wherein the inner ring flange is connected eccentrically in relation to the plunger body to this.
  • this connection is arranged in a further embodiment of the invention in the upper of the roller pioneering region of the roller and in turn arranged in a further embodiment of the invention at least a third of the total length of the plunger body.
  • the total length of the plunger body is 10 mm to 20 mm, preferably 1 5 mm.
  • the increased tilting can be achieved by the angle ⁇ also by a shortened plunger body, since at the same game between the pump housing and the plunger body whose leadership allows more tilting.
  • Figure 1 is a perspective sectional view of a portion of a piston pump
  • Figure 2 is a sectional view through a roller tappet, which is mounted in a housing formed as a slot guide in the pump housing and
  • FIG. 3 shows a sectional view of a tappet, in which the connection of an inner ring flange is connected to the tappet body off-center in relation to the tappet body.
  • 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 a metering unit and a suction valve from a pump interior 3.
  • the pump interior 3 the fuel is introduced by 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 axially with the inner wall of the plunger body
  • 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 tilt up the cam path of the pump camshaft 5 and the roller 9 will move axially of its longitudinal axis , A predetermined axial clearance is necessary, so that in the rising edge of the cam 8 at a given plunger rotation ß the roller 9 is not immediately on the plunger body 12 to the plant and can produce wear. Wear can only be generated if a force F ax can be transmitted to the tappet body 12. Furthermore, even a slight twist shortens the line contact between the roller 9 and the cam 8 and thus increases the heart 's pressure. For highly loaded piston pumps with a long intended service life (for example, more than 750,000 km), there is the danger of cam or roller fatigue.
  • FIG 2. A first embodiment for reducing or even preventing the rotation by the angle ß is shown in FIG 2.
  • the possibility of tilting of the plunger body 12 by the angle ⁇ (shown in Figure 3) about the vertical axis by the plunger body 12 is deliberately enhanced. This is possible because the guide in the pump housing 4 and the housing guide 17 by a
  • FIG. 3 shows a further possibility of increasing the freedom to tilt the tappet body 12.
  • the plunger body 12 is made shorter on the pump piston side, so that there is an eccentric arrangement of the inner ring flange 13 on the plunger body.
  • the reel 9, the roller shoe 1 1, the spring washer 16, the pump spring 15 and the pump piston 1 remain unchanged.
  • Another advantage of this embodiment is that the sum of the moving mass reduced by the shorter plunger body 12 and thus the entire engine load is reduced. It is within the scope of the invention also possible to carry out a combination of the measures shown in Figures 2 and 3 to increase the freedom to tilt the plunger body.

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

L'invention concerne une pompe à piston comportant un carter de pompe (4) dans lequel un arbre à cames de pompe (5) est logé rotatif et interagit avec un piston de pompe (1) au moyen d'un poussoir à galet (10) logé mobile en translation dans le carter de pompe (4), le poussoir à galet (10) présentant un corps de poussoir (12) mobile dans un guide de carter (17), un sabot à galet (11) recevant un galet de roulement (9) étant inséré dans le corps de poussoir. Le galet de roulement (9) interagit avec une piste de cames de l'arbre à cames de pompe (5). Selon l'invention, le comportement d'usure d'une telle pompe à piston est amélioré. A cet effet, le poussoir à galet (10) peut être incliné d'un angle d'inclinaison Φ autour d'un axe longitudinal par le galet de roulement (9), l'angle d'inclinaison Φ étant compris entre -± 0,08° et ± 0,22° et valant notamment ± 0,15°.
PCT/EP2012/055363 2011-05-18 2012-03-27 Pompe à piston WO2012156137A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011076018.0 2011-05-18
DE201110076018 DE102011076018A1 (de) 2011-05-18 2011-05-18 Kolbenpumpe

Publications (1)

Publication Number Publication Date
WO2012156137A1 true WO2012156137A1 (fr) 2012-11-22

Family

ID=45937267

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/055363 WO2012156137A1 (fr) 2011-05-18 2012-03-27 Pompe à piston

Country Status (2)

Country Link
DE (1) DE102011076018A1 (fr)
WO (1) WO2012156137A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102979725A (zh) * 2012-12-03 2013-03-20 宜兴市宙斯泵业有限公司 轴对称曲面旋转变容泵
GB2533610A (en) * 2014-12-22 2016-06-29 Gm Global Tech Operations Llc Fuel unit pump and internal combustion engine comprising it

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6102767B2 (ja) * 2014-01-24 2017-03-29 株式会社デンソー 高圧燃料ポンプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030175137A1 (en) * 2002-03-15 2003-09-18 Hiroshi Inoue High pressure supply pump with lifter guide and method of manufacturing the lifter guide
WO2005088125A1 (fr) * 2004-03-09 2005-09-22 Robert Bosch Gmbh Pompe haute pression, notamment pour un dispositif d'injection de carburant d'un moteur a combustion interne
DE102006045933A1 (de) * 2006-09-28 2008-04-03 Robert Bosch Gmbh Stößelbaugruppe für eine Hochdruckpumpe und Hochdruckpumpe mit wenigstens einer Stößelbaugruppe
DE102007022220A1 (de) * 2007-05-11 2008-11-13 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffsystem einer Brennkraftmaschine
DE102008001718A1 (de) 2008-05-13 2009-11-19 Robert Bosch Gmbh Hochdruckkraftstoffpumpe
WO2011072913A2 (fr) * 2009-12-18 2011-06-23 Robert Bosch Gmbh Dispositif anti-cavitation sur le cylindre de pompe d'une pompe haute pression
DE102010027749A1 (de) * 2010-04-14 2011-10-20 Robert Bosch Gmbh Hochdruckpumpe

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030175137A1 (en) * 2002-03-15 2003-09-18 Hiroshi Inoue High pressure supply pump with lifter guide and method of manufacturing the lifter guide
WO2005088125A1 (fr) * 2004-03-09 2005-09-22 Robert Bosch Gmbh Pompe haute pression, notamment pour un dispositif d'injection de carburant d'un moteur a combustion interne
DE102006045933A1 (de) * 2006-09-28 2008-04-03 Robert Bosch Gmbh Stößelbaugruppe für eine Hochdruckpumpe und Hochdruckpumpe mit wenigstens einer Stößelbaugruppe
DE102007022220A1 (de) * 2007-05-11 2008-11-13 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffsystem einer Brennkraftmaschine
DE102008001718A1 (de) 2008-05-13 2009-11-19 Robert Bosch Gmbh Hochdruckkraftstoffpumpe
WO2011072913A2 (fr) * 2009-12-18 2011-06-23 Robert Bosch Gmbh Dispositif anti-cavitation sur le cylindre de pompe d'une pompe haute pression
DE102010027749A1 (de) * 2010-04-14 2011-10-20 Robert Bosch Gmbh Hochdruckpumpe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102979725A (zh) * 2012-12-03 2013-03-20 宜兴市宙斯泵业有限公司 轴对称曲面旋转变容泵
CN102979725B (zh) * 2012-12-03 2016-02-10 宜兴市宙斯泵业有限公司 轴对称曲面旋转变容泵
GB2533610A (en) * 2014-12-22 2016-06-29 Gm Global Tech Operations Llc Fuel unit pump and internal combustion engine comprising it

Also Published As

Publication number Publication date
DE102011076018A1 (de) 2012-11-22

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