WO2014170160A1 - Dispositif d'amortissement de pulsations pour une pompe haute pression - Google Patents

Dispositif d'amortissement de pulsations pour une pompe haute pression Download PDF

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Publication number
WO2014170160A1
WO2014170160A1 PCT/EP2014/056954 EP2014056954W WO2014170160A1 WO 2014170160 A1 WO2014170160 A1 WO 2014170160A1 EP 2014056954 W EP2014056954 W EP 2014056954W WO 2014170160 A1 WO2014170160 A1 WO 2014170160A1
Authority
WO
WIPO (PCT)
Prior art keywords
damper piston
damper
channel
fuel
fuel injection
Prior art date
Application number
PCT/EP2014/056954
Other languages
German (de)
English (en)
Inventor
Francesco Lucarelli
Thomas Koenig
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 WO2014170160A1 publication Critical patent/WO2014170160A1/fr

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations

Definitions

  • the invention relates to a device for pulsation damping, for
  • Fuel injection systems of internal combustion engines is used, and a
  • Fuel injection system with such a device for pulsation damping Specifically, the invention relates to the field of fuel injection systems of air compressing, self-igniting internal combustion engines.
  • Low pressure system are used.
  • a design of the cooling throttle can be carried out to C02-optimized starting points, in which the flowing through cooling amount can be designed for a TKU-compliant normal operation.
  • the low-pressure quantity balance can be optimized from the point of view of CO 2 production.
  • Onset of boiling is the temperature at which boiling sets in, comparatively low.
  • the medium pressure by increasing the flow rate of a prefeed pump,
  • inventive device with the features of claim 1 and the fuel injection system according to the invention with the features of claim 8 have the advantage that an improved design and improved operation are possible.
  • pulsations can be reduced and damage to components due to cavitation or outgassing of the fuel can be avoided.
  • the throttle bore on an output side end face of the damper piston, which faces the output of the passage channel a
  • Damper piston against the spring element thus follows a pressure of the fuel at the entrance of the passageway.
  • the displaced volume compensates for pressure peaks.
  • the spring element on the one hand on an output side end face of the damper piston, which faces the output of the passage channel, is supported.
  • a closure element is provided, which is arranged in the passage between the spring element and the outlet of the passage channel fixed relative to the damper housing, that the spring element on the other hand is supported on a damper piston end face of the closure element and that the closure element a Through hole has.
  • the passage of the damper housing may be configured as a through hole with at least approximately constant cross-section.
  • the closure element may for example be pressed into the through bore of the damper housing. This also simplifies the production of the damper housing with the designed as a through-hole passageway.
  • the passage channel has a longitudinal axis, and that the throttle bore of the damper piston is arranged at least approximately on the longitudinal axis.
  • the flow through the through-channel is further improved.
  • the hydraulic force generated by the pressure drop at the throttle bore and the larger cross section in the passageway can thereby at least in
  • Passage channel of the damper housing is guided, designed as a cylinder jacket-shaped outer side.
  • the damper housing allows.
  • the input of the through-channel is connected to an engine room of the high-pressure pump.
  • a pressure gradient between the prevailing in the engine room pump internal pressure and a pressure beyond the throttle point in the passage then provides the deflection of the damper piston.
  • the damper piston then follows the pump interior pressure
  • the device for pulsation damping can be integrated, which damps the pulsations with the acted upon by a spring force damper piston.
  • the damper piston may be located a coaxial bore, the
  • a throttle diameter of the throttle point may be specified in relation to the particular application.
  • Damper piston flowing amount of fuel can thus be guided through the damper housing and arranged over the in the passage of the damper housing
  • Closing element are passed to the return of the high-pressure pump.
  • a cooling of the fuel is possible.
  • materials that can serve, inter alia, for the damper housing, the damper piston and the closure element metallic materials and / or plastics can be used. In the embodiment of the fuel injection system, it is conceivable that the
  • Damper housing is wholly or partially formed by a housing of the high-pressure pump. In this way, the device for pulsation damping in the
  • High-pressure pump to be integrated.
  • the damper housing by a
  • Housing part of the high-pressure pump may be formed, which forms the pump housing return.
  • throttles can be provided, via which the engine room is connected to the return.
  • the throttles can also be formed by bearings of the high-pressure pump, which serve to support a drive shaft of the high-pressure pump.
  • a prefeed pump may be provided which conveys the fuel from the return to an engine room of the high-pressure pump.
  • Fig. 1 is a fuel injection system with a device for pulsation damping in a partial, schematic sectional view corresponding to a
  • FIG. 1 shows a fuel injection system 1 with a device 2 for pulsation damping according to an embodiment in an excerpt from, schematic
  • the fuel injection system 1 can be used in particular for air-compressing, self-igniting internal combustion engines.
  • a high pressure pump 3 of the fuel injection system 1 can be used in particular for air-compressing, self-igniting internal combustion engines.
  • Fuel injection system 1 is particularly suitable for a fuel injection system 1 with a common rail that stores diesel fuel under high pressure.
  • fuel injection system 1 according to the invention is also suitable for others
  • the high pressure pump 3 shown schematically has an engine room 4. Further, throttles 5, 6 are provided, for example, by a flange bearing, a
  • the throttle 5 may be formed by a flange 5, while the throttle 6 by a
  • Housing bearing 6 is formed. At these bearings, for example, a drive shaft of the high-pressure pump 3 can be mounted, which serves to drive a pump assembly to promote fuel from the engine compartment 4 at high pressure.
  • the fuel injection system 1 has a prefeed pump 7 which conveys fuel from a tank 8 into the engine room 4. As a result, there is fuel under low pressure in the engine compartment 4.
  • the prefeed pump 7 can in particular be designed as an electric fuel pump (electric fuel pump) 7.
  • Fuel injection system 1 further comprises a return line 9 formed by a return line 9, which leads to the tank 8. The passing, for example, via the throttles 5, 6 in the return 9 fuel can thus be promoted by the tank 8 from the prefeed pump 7 back into the engine room 4.
  • the device 2 for pulsation damping has a damper housing 15, in which a through-channel 16 is formed, a damper piston 17, a closure element 18 and a spring element 19.
  • the damper piston 17, the closure element 18 and the spring element 19 are arranged in the through-channel 16.
  • Passageway 16 configured in this embodiment as a through hole.
  • the through hole 16 has a longitudinal axis 20, wherein a diameter 21 of the through hole 16 and thus also a cross section of the through channel 16 along the longitudinal axis 20 is at least approximately constant.
  • the passage 16 has an inlet 22 and an outlet 23. In the region of the inlet 22 of the damper piston 17 is disposed in the through hole 16 when the damper piston 17 is in an initial position. In this starting position the damper piston 17 is acted upon by the spring element 19 against a stop plate 24. The damper piston 17 is in particular in the pressureless state in its starting position.
  • the closure member 18 is fixed relative to the damper housing 15 in the
  • the closure element 18 may be pressed into the through hole 16 of the damper housing 15.
  • the closure element 18 may be pressed into the through hole 16 of the damper housing 15.
  • Closing element 18 is arranged at the outlet 23 of the through hole 16.
  • the spring element 19 is supported on the one hand on an output-side end face 25 of the
  • the damper piston 17 has a throttle bore 27.
  • the throttle bore 27 has on the output side end face 25 of the damper piston 17, a throttle point 28.
  • closure element 18 has a through hole 29.
  • Damper housing 15 connected to the engine room 4. Further, the output 23 of the through hole 16 of the damper housing 15 is connected to the return line 9.
  • Engine room 4 promotes, then flows a part of this fuel through the inlet 22 into the through hole 16.
  • the fuel flows here among other things by the
  • the damper housing 15 is designed as a separate damper housing 15, whereby the means for
  • Pulsation damping 2 can be connected in a suitable manner with the high-pressure pump 3.
  • a connection via a line piece is possible.
  • the device 2 for pulsation damping can also be used in a housing of the high pressure pump 3, wherein a seal via a sealing ring 31 which is inserted into a circumferential groove 32 of the damper housing 15, is possible.
  • the damper housing 15 can also be configured completely or partially by a housing part of the high-pressure pump 3.
  • the device 2 for pulsation damping can also be completely or partially integrated into the high-pressure pump 3.
  • the invention is not limited to the described embodiments.

Landscapes

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

Abstract

Dispositif (2) d'amortissement de pulsations servant dans des systèmes d'injection de carburant de moteurs à combustion interne et comprenant un boîtier d'amortisseur (15) pourvu d'un canal traversant (16), un piston d'amortisseur (17) guidé dans le canal traversant (16), et un élément ressort (19). Le piston d'amortisseur (17) se déplace à l'encontre de l'élément ressort (19) dans le canal traversant (16). Le piston d'amortisseur (17) comporte également un orifice d'étranglement (27) par lequel le carburant passe d'une entrée (22) du canal traversant (16) à une sortie (23) du canal traversant (16). L'invention concerne en outre un système d'injection de carburant (1) doté d'un dispositif (2) d'amortissement de pulsations de ce type.
PCT/EP2014/056954 2013-04-17 2014-04-07 Dispositif d'amortissement de pulsations pour une pompe haute pression WO2014170160A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013206905.7 2013-04-17
DE201310206905 DE102013206905A1 (de) 2013-04-17 2013-04-17 Einrichtung zur Pulsationsdämpfung für eine Hochdruckpumpe

Publications (1)

Publication Number Publication Date
WO2014170160A1 true WO2014170160A1 (fr) 2014-10-23

Family

ID=50478829

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/056954 WO2014170160A1 (fr) 2013-04-17 2014-04-07 Dispositif d'amortissement de pulsations pour une pompe haute pression

Country Status (2)

Country Link
DE (1) DE102013206905A1 (fr)
WO (1) WO2014170160A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001207930A (ja) * 2000-01-26 2001-08-03 Denso Corp 蓄圧式燃料噴射装置
EP1217201A2 (fr) * 2000-11-23 2002-06-26 Juan Fierro Aguirre Tuyau pour alimenter en carburant un moteur à combustion interne
EP1653076A1 (fr) * 2004-10-29 2006-05-03 Denso Corporation Amortisseur d'écoulement pour un dispositif d'injection à une rampe commune
WO2007071817A1 (fr) * 2005-12-22 2007-06-28 Wärtsilä Finland Oy Arrangement pour l'amortissement des vibrations de pression d'un systeme d'alimentation en carburant d'un moteur a piston

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001207930A (ja) * 2000-01-26 2001-08-03 Denso Corp 蓄圧式燃料噴射装置
EP1217201A2 (fr) * 2000-11-23 2002-06-26 Juan Fierro Aguirre Tuyau pour alimenter en carburant un moteur à combustion interne
EP1653076A1 (fr) * 2004-10-29 2006-05-03 Denso Corporation Amortisseur d'écoulement pour un dispositif d'injection à une rampe commune
WO2007071817A1 (fr) * 2005-12-22 2007-06-28 Wärtsilä Finland Oy Arrangement pour l'amortissement des vibrations de pression d'un systeme d'alimentation en carburant d'un moteur a piston

Also Published As

Publication number Publication date
DE102013206905A1 (de) 2014-10-23

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