EP0990792A2 - Système d'injection de carburant de type Common-Rail - Google Patents

Système d'injection de carburant de type Common-Rail Download PDF

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Publication number
EP0990792A2
EP0990792A2 EP99116319A EP99116319A EP0990792A2 EP 0990792 A2 EP0990792 A2 EP 0990792A2 EP 99116319 A EP99116319 A EP 99116319A EP 99116319 A EP99116319 A EP 99116319A EP 0990792 A2 EP0990792 A2 EP 0990792A2
Authority
EP
European Patent Office
Prior art keywords
rail
injection system
plunger
high pressure
valve
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.)
Withdrawn
Application number
EP99116319A
Other languages
German (de)
English (en)
Other versions
EP0990792A3 (fr
Inventor
Fritz Spinnler
Claudio Zanetti
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.)
CRT Common Rail Technologies AG
Original Assignee
CRT COMMON RAIL TECHNOLOGIES AG
Schweizerische Industrie Gesellschaft
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 CRT COMMON RAIL TECHNOLOGIES AG, Schweizerische Industrie Gesellschaft filed Critical CRT COMMON RAIL TECHNOLOGIES AG
Publication of EP0990792A2 publication Critical patent/EP0990792A2/fr
Publication of EP0990792A3 publication Critical patent/EP0990792A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • F02M59/08—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 two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
    • 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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention relates to a common rail injection system for internal combustion engines.
  • Common rail injection systems usually have one High pressure pump, a rail and injectors, each formed as separate units and by lines are interconnected.
  • Rail the task of storage, forwarding and distribution of the compressed in the high pressure pump and under high pressure medium to the injectors.
  • the connection of pump, rail, injectors, safety valves and any sensors via separate lines is complex to assemble and usually requires many individual parts such as high pressure lines and seals. Because of the required in modern engines, always higher pressures and due to the associated higher
  • the rail also meets safety requirements Manufacturing increasingly complex and expensive. So come e.g. special heat treatments and high-strength alloys used in the manufacture of the rail. The price for the common rail injection system of the internal combustion engine therefore increase.
  • the object of the present invention is to make it more cost-effective and thus more economical common rail injection system to provide.
  • the task is accomplished by a common rail injection system according to the features of claim 1.
  • this Injection system has a housing element that has a guide section for preferably tight guidance of a Plunger includes.
  • the housing element is the Recess of the rail upstream and fixed to the rail connected so that the delivery chamber through the housing element is tightly sealed to the outside.
  • the seal between rail and housing element e.g. by a provided between the rail and the housing element causes the seal his.
  • the housing element is preferably with its Housing axis aligned with a delivery chamber axis of the Delivery room arranged in the rail.
  • the part under pressure the plunger cylinder is in this way through the rail formed, so that only for the rail an expensive, pressure-resistant Material must be used. That the guide section having housing element, however, can be cheaper Material are made. Is particularly cheap it when the housing element is part of a pump housing High pressure pump is.
  • a one-piece molded rail is very advantageous.
  • cylinder wall in front of the recess, the one Guide section for preferably tight guidance of the Plunger has.
  • the sealing is of the delivery room is particularly simple.
  • a housing element can grip around the cylinder wall, connect to these or be completely omitted if e.g. instead of the housing element, the pump housing of the high pressure pump attacks directly on the cylinder wall.
  • one is in the rail with the help of a Passage valve, closable passage channel incorporated, the the delivery chamber with a pressure chamber of the rail connects. In this way there is a separate connection line redundant between these two rooms.
  • a suction valve closable feed channel via which the delivery chamber during the suction stroke of the plunger a print medium can be supplied.
  • the rail does not meet only the task of distributing the print medium to the Injectors and the task of the pressurized, the delivery chamber surrounding part of the plunger, but additionally the task of the valve head of the high pressure pump. It is particularly advantageous if that Rail itself is provided with appropriate valve seats.
  • the high pressure pump with a corresponding Number of plungers operated, in particular be driven with the help of a single drive shaft can.
  • FIG. 1 and 2 show a first and a second embodiment of the common rail injection system according to the invention 10 each with one along its longitudinal axis 12 shown cut rail 14 and a high pressure pump 16, which has two plungers 20.
  • first embodiment two plungers 20 each using a separate, with its shaft axis 13 perpendicular to the longitudinal axis 12 of the Rails 14 arranged drive shaft 18 driven.
  • the two plungers 20 however, from a common, with its shaft axis 13 parallel to the longitudinal axis 12 of the rail 14 arranged drive shaft 18 driven.
  • FIG. 3 shows the rail 14 and the high pressure pump 16 of the in Fig. 2 shown second embodiment in cross section to the respective longitudinal axis 12, 13 of the rail 14 and the Shaft 18 according to section line III-III.
  • the third embodiment shown in FIG. 4 is constructed in principle the same as that in FIGS. 2 and 3 embodiment shown. Instead of a housing element 54 as in FIGS. 2 and 3, but points in Fig. 4, the rail 14 has a guide section 56 for guidance of the plunger 20.
  • the drive shafts 18 are in all the examples shown designed as eccentric shafts. Exemplary for likewise to the injection system 10 injectors is in 1 and 2, each an injector 22 shown, the via a connecting line 24 with one in the rail 14 incorporated connection channel 26 and with this one extending in the longitudinal direction of the rail 14 Pressure chamber 28 of the rail 14 is connected.
  • Passage channel 32 is the pressure chamber 28 with two in one Rail 36 located recess 36 connected.
  • Each of the recesses 36 in the rail 14 is shown in FIGS Examples are cylindrical and limited its recess walls 38 a delivery room 40.
  • the delivery room 40 is 37 with its axis of the pumping chamber aligned perpendicular to the rail outer wall 34.
  • the culvert 32 opens at a distance from the rail outer wall 34 the delivery chamber 40. Also opens with a suction valve 42 provided feed channel 44 spaced from Rail outer wall 34 in the delivery room 40.
  • the feed channel 44 connects the delivery chamber 40 via a feed line 46 the high pressure pump 16 with a, not shown here, Media container. This container becomes a suction stroke of the plunger 20 into the delivery chamber 40 Media A fed.
  • the suction valve 42 and the passage valve 30 are each designed as pressure valves and with a valve body 48, 48 'a spring 50, 50' and one the spring 50, 50 'supporting bearings 51, 51'.
  • a valve seat 52, 52 ' is incorporated directly into the rail 14.
  • the intake valve 42 the feed channel 44 opened and through the passage valve 30 the passage channel 32, 32b closed, while at a passage stroke the passage 32, 32b opened and the feed channel 44 is closed.
  • the piston stroke is each marked with H or half a piston stroke with H / 2.
  • the rail 14 is so in this arrangement configured that a valve head 53 of the high pressure pump 16 is an integral part of the rail 14.
  • the attachment itself is not shown, but can e.g. by means of screws or similar known fasteners.
  • the delivery chamber 40 is through the recess walls 38 of the Recess 36 of the rail 14 and through the plunger 20 and through a region 59 of the end face 60 of the housing element 54 limited.
  • a groove 62 embedded in the Sealing the delivery chamber 40 from the outside a seal 64 is provided.
  • the seal 64 is in the radial direction close to the recess 36 and in the assembled state arranged between the rail 14 and the housing element 54.
  • the plunger 20 protrudes throughout the working stroke suction stroke cycle, Piston stroke H, in the recess 36 of the rail 14, the recess walls 38 of the plunger 20 surrounded with play.
  • the housing element 54 is part of a pump housing 68 the high pressure pump 16 which also the drive shaft (s) 18 surrounds.
  • the rail 14 also forms the conveying space 40 and comprising the valve head 53, at the same time part of the pump housing 68.
  • a portion 70 and 70 'of the Feed channel 44 and the passage channel 32, 32b in the the valve seat 52, 52 'of the intake valve 42 and the Pass valve 30 is designed or arranged so that it is easily accessible from the outside before installation and the respective parts of the valves 30, 42 can be used easily.
  • Examples are insert openings 72, 72 ', which the Sections 70, 70 'of channels 32 and 44 accessible from the outside make perpendicular to the longitudinal axis 12 of the rail 14 arranged.
  • the insert opening 72 'of the passage 32 leads vertically under the pressure chamber 28 of the rail 14 and has in its outer region 73 'for example a thread 74 for receiving a screw 76 on.
  • the screw 76 serves as a bearing with its foot 78 51 'for the spring 50' of the passage valve 30.
  • a first section 32a of the passage channel 32 opens into the insert opening 72 ', which is the connection to the pressure chamber 28 guaranteed.
  • the insert opening 72 'in its Continuing in the longitudinal direction finally narrows and goes into a second section 32b of the passageway 32 via, which establishes the connection to the delivery room 40 and laterally, spaced from the rail outer wall 34 in the delivery chamber 40 / the recess 36 opens.
  • the narrowing is shoulder-shaped and forms the valve seat 52 'for the valve body 48' of the ball Pass valve 30.
  • the intake valve 42 is a plunger 20 opposite Recess wall 38 'to the outside open insert opening 72 broken.
  • the valve body forms 48 of the intake valve 42 thus also a part the limitation of the delivery space 40.
  • In the insert opening 72 opens laterally the feed channel 44 before the insert opening 72 in their outer area 73 to one narrow opening narrowed.
  • the inside diameter in this corresponds to outer area 73 of insert opening 72 the diameter of one on the valve body 48 of the intake valve 42 attached bolt 80 and guides it during the operation sealing.
  • the valve body 48 of the intake valve 42 For mounting the intake valve 42 the valve body 48 of the intake valve 42 before the Assembly of the housing element 54 in the recess 36 of the Rails 14 used so that the bolt 80 through the narrow, outer region 73 of the insert opening 72 protrudes from the rail 14. Finally, it becomes an intake valve 42 belonging spring 50 and the bearing 51 on the Bolt 80 attached and with a fastener 82 fixed to the bolt 80.
  • the rail 14 can, as in FIG. 3 shown to be designed such that the rail 14 protruding part of the intake valve 42 laterally from the rail projecting walls 84 is surrounded. The resulting one Cavity can be closed with a cover 86, so that the suction valve 42 is protected.
  • the third embodiment shown in FIG. 4 corresponds essentially that shown in FIGS. 2 and 3 second embodiment. It is different only by the second embodiment that before Recess 36 and concentric with this one Hollow cylinder-forming cylinder wall 88 perpendicular from the Rail outer wall 34 protrudes.
  • This cylinder wall 88 forms instead of the housing element 54, the guide section 56 for tight guidance of the plunger 20.
  • the recess 36 has the cylinder wall 88 smaller clear cross-section, but that Inserting the valve body 48 of the intake valve 42 in the delivery space 40 / the recess 36 still allows.
  • Guide section 56 inserted plunger 20 is the delivery chamber 40 through the cylinder wall 88 and the plunger 20 sealed to the outside.
  • the housing element 54 encircles the cylinder wall 88 on the circumference and is analogous to the first and second example of implementation on the Rail outer wall 34 attached.
  • the fourth embodiment shown in FIG. 5 corresponds essentially that shown in Figs. 2-4 second and third embodiments.
  • the leadership section 56 for the plunger 20 is however by a separate guide element 90 with a plunger 20 sealing leading through hole 91 is formed.
  • the Guide element 90 has one directed against the rail 14 Cantilever 92 on which it is not shown Screws or similar fasteners on the Rail outer wall 34 is attached.
  • a cantilever Groove 64 opposite rail 14 is one Seal 62 provided that the delivery chamber 40 against Sealed on the outside.
  • the guide element 90 is in this Example encircled by the housing element 54, it can also be connected directly to the pump housing 68 be so that the housing element 54 is omitted.
  • Variations also exist in the design of the delivery chamber 40 and the guide section 56. So it is e.g. possible with the one presented in FIG. 4 Embodiment on the rail outer wall 34 directly a To fix drive shaft 18 surrounding pump housing 68, so that the housing element 54 becomes superfluous.
  • the Housing element 54 can also be attached to cylinder wall 88 Then be fastened to the rail, butt after butt, instead of encompassing the cylinder wall 88.
  • FIG. 6 shows a further variation: in the fifth embodiment an insert 96 is inserted into the recess 36, which has the delivery space 40.
  • Rails 14 has the insert 96 valve seats 52, 52 'of Valves 30, 42 on.
  • the transition from insert 96 to rail 14 on the passage 32 is in by means of a seal 92 a sealing groove 94 sealed.
  • the Housing element 54 is arranged with its housing axis 58.
  • the housing element 54 is on the rail outer wall 34 of the Rails 14 attached that insert 96 between the housing member 54 and the rail 14 axially clamped and the Seal 92 is preloaded in the sealing groove 94.
  • a radial one Press fit for insert 96 is not necessary.
  • the cover 86 closes the bearing 51 and the spring 50 and part of the pin 80 of the intake valve 42 receiving insert opening 72 of the feed channel 44
  • Guide the pin 80 in the outer area 73 of the insert opening 72 is with an annular, the feed channel 44 additional channel 44b provided the feed channel 44 with the valve body 48 of the intake valve 42 connects the delivery room 40.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP99116319A 1998-09-30 1999-08-19 Système d'injection de carburant de type Common-Rail Withdrawn EP0990792A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH198798 1998-09-30
CH198798 1998-09-30

Publications (2)

Publication Number Publication Date
EP0990792A2 true EP0990792A2 (fr) 2000-04-05
EP0990792A3 EP0990792A3 (fr) 2003-05-21

Family

ID=4223267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116319A Withdrawn EP0990792A3 (fr) 1998-09-30 1999-08-19 Système d'injection de carburant de type Common-Rail

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EP (1) EP0990792A3 (fr)
JP (1) JP2000110692A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6330876B1 (en) 1999-11-19 2001-12-18 Crt Common Rail Technologies Ag High-pressure injection system with common rail
WO2002079635A1 (fr) * 2001-03-30 2002-10-10 Robert Bosch Gmbh Pompe a carburant haute pression a rampe commune integree
DE10136925C1 (de) * 2001-07-30 2002-12-12 Orange Gmbh Kraftstoff-Einspritzeinrichtung für Brennkraftmaschinen
DE10136926C1 (de) * 2001-07-30 2003-01-16 Orange Gmbh Kraftstoff-Einspritzeinrichtung für Brennkraftmaschinen
DE10157135A1 (de) * 2001-11-21 2003-06-12 Man B & W Diesel Ag Kraftstoffversorgungsanlage in Form eines Common-Rail-Systems einer Brennkraftmaschine mit mehreren Zylindern
WO2010094367A1 (fr) * 2009-02-18 2010-08-26 Robert Bosch Gmbh Pompe d'alimentation haute pression pour moteur à combustion interne
ITTO20090715A1 (it) * 2009-09-21 2011-03-22 Torino Politecnico Gruppo pompa perfezionato per un apparato di iniezione di un motore a combustione interna
CN102770659A (zh) * 2010-01-27 2012-11-07 罗伯特·博世有限公司 具有集成的高压存储器的燃料喷射***
ITUB20159428A1 (it) * 2015-12-29 2017-06-29 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006170432A (ja) * 2004-11-22 2006-06-29 Fuji Techno Industries Corp ボール弁装置
JP4407754B2 (ja) * 2008-01-29 2010-02-03 株式会社デンソー ポンプ
DE102011005096A1 (de) * 2011-03-04 2012-09-06 Man Diesel & Turbo Se Verbrennungsmotor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994027041A1 (fr) * 1993-05-06 1994-11-24 Cummins Engine Company, Inc. Systeme d'alimentation en carburant haute performance, compact, a accumulateur
EP0685644A2 (fr) * 1994-05-06 1995-12-06 Cummins Engine Company, Inc. Pompe à haute pression pour systèmes d'injection de combustible
EP0915252A2 (fr) * 1997-11-05 1999-05-12 SIG Schweizerische Industrie-Gesellschaft Système d'injection par alimentation commune des injecteurs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994027041A1 (fr) * 1993-05-06 1994-11-24 Cummins Engine Company, Inc. Systeme d'alimentation en carburant haute performance, compact, a accumulateur
EP0685644A2 (fr) * 1994-05-06 1995-12-06 Cummins Engine Company, Inc. Pompe à haute pression pour systèmes d'injection de combustible
EP0915252A2 (fr) * 1997-11-05 1999-05-12 SIG Schweizerische Industrie-Gesellschaft Système d'injection par alimentation commune des injecteurs

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6745753B2 (en) 1999-11-19 2004-06-08 Crt Common Rail Technologies Ag High-pressure injection system
US6330876B1 (en) 1999-11-19 2001-12-18 Crt Common Rail Technologies Ag High-pressure injection system with common rail
WO2002079635A1 (fr) * 2001-03-30 2002-10-10 Robert Bosch Gmbh Pompe a carburant haute pression a rampe commune integree
DE10115859A1 (de) * 2001-03-30 2002-10-17 Bosch Gmbh Robert Kraftstoffhochdruckpumpe mit integriertem Common-Rail
DE10136925C1 (de) * 2001-07-30 2002-12-12 Orange Gmbh Kraftstoff-Einspritzeinrichtung für Brennkraftmaschinen
DE10136926C1 (de) * 2001-07-30 2003-01-16 Orange Gmbh Kraftstoff-Einspritzeinrichtung für Brennkraftmaschinen
US6776140B2 (en) 2001-11-21 2004-08-17 Man B&W Diesel Aktiengesellschaft Fuel supply installation in the form of a common-rail system of an internal combustion engine having a plurality of cylinders
DE10157135B4 (de) * 2001-11-21 2004-03-11 Man B & W Diesel Ag Kraftstoffversorgungsanlage in Form eines Common-Rail-Systems einer Brennkraftmaschine mit mehreren Zylindern
DE10157135A1 (de) * 2001-11-21 2003-06-12 Man B & W Diesel Ag Kraftstoffversorgungsanlage in Form eines Common-Rail-Systems einer Brennkraftmaschine mit mehreren Zylindern
WO2010094367A1 (fr) * 2009-02-18 2010-08-26 Robert Bosch Gmbh Pompe d'alimentation haute pression pour moteur à combustion interne
CN102325994A (zh) * 2009-02-18 2012-01-18 罗伯特·博世有限公司 用于内燃机的高压燃料泵
CN102325994B (zh) * 2009-02-18 2015-10-21 罗伯特·博世有限公司 用于内燃机的高压燃料泵
ITTO20090715A1 (it) * 2009-09-21 2011-03-22 Torino Politecnico Gruppo pompa perfezionato per un apparato di iniezione di un motore a combustione interna
WO2011033379A1 (fr) * 2009-09-21 2011-03-24 Politecnico Di Torino Unité de pompe améliorée pour dispositif d'injection de moteur à combustion interne
CN102770659A (zh) * 2010-01-27 2012-11-07 罗伯特·博世有限公司 具有集成的高压存储器的燃料喷射***
CN102770659B (zh) * 2010-01-27 2015-05-20 罗伯特·博世有限公司 具有集成的高压存储器的燃料喷射***
ITUB20159428A1 (it) * 2015-12-29 2017-06-29 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna

Also Published As

Publication number Publication date
EP0990792A3 (fr) 2003-05-21
JP2000110692A (ja) 2000-04-18

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