EP3054144A1 - Vanne de decharge de pompe haute pression, en particulier pompe enfichable et pompe haute pression comprenant une telle vanne de decharge - Google Patents

Vanne de decharge de pompe haute pression, en particulier pompe enfichable et pompe haute pression comprenant une telle vanne de decharge Download PDF

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Publication number
EP3054144A1
EP3054144A1 EP15200341.4A EP15200341A EP3054144A1 EP 3054144 A1 EP3054144 A1 EP 3054144A1 EP 15200341 A EP15200341 A EP 15200341A EP 3054144 A1 EP3054144 A1 EP 3054144A1
Authority
EP
European Patent Office
Prior art keywords
valve
pump
valve housing
pressure pump
bore
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.)
Granted
Application number
EP15200341.4A
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German (de)
English (en)
Other versions
EP3054144B1 (fr
Inventor
Jochen Aleker
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3054144A1 publication Critical patent/EP3054144A1/fr
Application granted granted Critical
Publication of EP3054144B1 publication Critical patent/EP3054144B1/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
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M59/025—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 a single piston
    • F02M59/027—Unit-pumps, i.e. single piston and cylinder pump-units, e.g. for cooperating with a camshaft
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief valves

Definitions

  • the invention relates to an overflow valve for a preferably designed as a plug-pump high-pressure pump in a fuel injection system of an internal combustion engine having the features of the preamble of claim 1. Furthermore, the invention relates to a high-pressure pump, in particular plug-in pump, with such a relief valve.
  • An overflow valve of the aforementioned type is used for the mechanical control of the filling pressure of the high-pressure pump.
  • the overflow valve is arranged in an inlet region of the high-pressure pump and opens when the pressure in the inlet region exceeds a predetermined pressure. With the opening of the overflow valve, an excess amount of fuel is then supplied from the inlet region to a return region.
  • the overflow valve can be integrated into a high-pressure pump or be part of an assembly that can be connected to the high-pressure pump.
  • a low-pressure unit for a fuel pump in particular a high-pressure pump of an air-compressing, self-igniting internal combustion engine, known which serves to supply the fuel pump with fuel and has an overflow valve to control an excess amount of fuel.
  • the overflow valve is integrated into a housing of the low-pressure unit, via which the low-pressure unit can be connected to the fuel pump.
  • the connection is made in such a way that the housing can be fastened in different angular positions on the fuel pump.
  • inlet and Return nozzles are formed by the housing of the low pressure unit, they can be aligned according to the respective angular positions in space.
  • An overflow valve of the aforementioned type is unnecessary if the fuel injection system in addition to the high-pressure pump comprises a regulated electric fuel pump as Vor fundamentalpumpe. Because then the high pressure pump supplied amount of fuel and thus the filling pressure can be specified by the electric fuel pump.
  • the present invention is based on the object of specifying a type of modular system, which comprises as the smallest unit an overflow valve, which can be attached to a high-pressure pump in a simple manner.
  • the attachment of the overflow valve to the high-pressure pump is in particular no structural changes to the high-pressure pump itself requires to this - depending on the design of the fuel injection system - to use either with or without overflow. This increases the possible applications of the high-pressure pump.
  • the spill valve should be simple and inexpensive to produce.
  • the overflow valve is specified with the features of claim 1. Furthermore, a high-pressure pump, in particular plug-in pump, proposed with such a spill valve. Advantageous developments of the invention can be found in the respective subclaims.
  • the overflow valve proposed for a high-pressure pump, in particular a plug-in pump, in a fuel injection system of an internal combustion engine comprises a valve piston which is received axially displaceably in a central bore of a valve housing for connection of an inlet with a return against the spring force of a valve spring.
  • the valve housing has at least two radial bores, which are arranged at an axial distance from each other and open into the central bore, wherein the first radial bore part of the inlet and the second radial bore part of the return line.
  • both the return and the inlet are aligned radially with respect to the central bore of the spill valve. Because this means that the central bore of the overflow valve can be used as an inlet for the high-pressure pump. This means that the inflow of fuel takes place via the overflow valve. This in turn has the consequence that a supply connection provided on the high-pressure pump, usually for connection to a supply line, can be dispensed with. The vacated space can instead be used for the attachment of the overflow valve. Since the inlet nozzle is a standardized component and therefore has defined dimensions, the valve housing of the overflow valve can be designed accordingly. This ensures that the overflow valve can be fitted to most high-pressure pumps. Because they have a matched to the standardized inlet nozzle receiving bore. This means that the same interface can be used optionally for mounting the inlet nozzle or the overflow valve.
  • the overflow valve according to the invention thus enables the realization of a cost-effective pump construction kit.
  • the spill valve can be mounted comparatively close to the high pressure area of the high pressure pump. This has the advantage that pressure losses in the supply line and / or in an upstream fuel filter can be counteracted. Furthermore, such a fitted overflow valve has a damping effect in volume waves or pressure pulsations.
  • the valve housing of the overflow valve is at least partially surrounded by a connecting body, which has at least two connecting pieces.
  • a first connection piece serves to connect a supply line and a second connection piece serves to connect a return line.
  • the connecting body can thus replace a standard inlet nozzle, which is preferably eliminated when mounting the overflow valve according to the invention to a high-pressure pump.
  • the connecting pieces of the connection body can be brought into overlap with the radial bores provided in the valve housing of the overflow valve. This means that the connecting pieces are aligned substantially radially with respect to the central bore of the spill valve and arranged at an axial distance from each other.
  • the connecting pieces can be brought into overlap with annular grooves formed in the valve housing on the outer circumference side, into which the radial bores open. In this case, the angular position of the connecting piece in relation to the valve housing of the overflow valve plays no role, so that the connecting pieces are arbitrarily aligned and the respective installation situation customizable.
  • connection body for fixing the angular position of the connecting piece is rotatable relative to the valve housing.
  • the rotatability of the connecting body relative to the valve housing can be realized in that the valve housing has a cylindrical portion which is enclosed by a sleeve-shaped portion of the connecting body, to which the connecting pieces are attached radially.
  • the connecting body can also be designed in several parts.
  • connection body is made of a plastic material.
  • thermoplastic materials are suitable.
  • the production takes place by means of an injection process, in particular using a slide tool.
  • the connecting body can also be made of a metallic material, such as aluminum or an aluminum alloy.
  • a plastic connector body If a plastic connector body is used, it can be pressed onto the valve housing in such a way that the required seal is ensured at the same time via the press fit.
  • the interference fit also prevents undesired rotation of the connection body relative to the valve housing.
  • the outer circumference in the valve housing at least one annular groove is formed for receiving a sealing ring.
  • the connecting body can then be pushed onto the valve housing in such a way that the sealing ring is compressed in the radial direction and rests under radial prestress on both the valve housing and the connecting body.
  • a kind of interference fit of the connector body is achieved on the valve housing, which prevents undesirable rotation of the connector body relative to the valve housing.
  • the annular groove for receiving the sealing ring in the axial direction between the two radial bores of the valve housing and / or the annular grooves is arranged, in which open the two radial bores.
  • the connection body at least two such sealing points between the two radial bores or annular grooves are provided.
  • a seal of the valve housing formed in the central bore to the outside is preferably achieved via a closure body, which is preferably pressed into the central bore. Further preferably, the valve spring is axially supported on the closure body, so that the average opening pressure of the overflow valve can be adjusted via the press-in depth of the closure body.
  • the valve housing of the overflow valve preferably has an external thread.
  • the external thread allows the screwing of the valve housing in a receiving bore of the high pressure pump, which usually serves to receive a standard inlet nozzle and this is equipped with an internal thread.
  • the screwed connection thus enables a particularly simple and cost-effective variation of the high-pressure pump in order to adapt it to the respective customer-specific circumstances. Because on the pump body, in particular on the barrel or cylinder head, which is usually made of a high-strength hardened steel, no costly and therefore expensive structural changes must be made. This applies in particular if the external thread provided for connecting the overflow valve to the high-pressure pump is arranged on a stub-shaped end of the valve housing.
  • the valve housing has at one end or at a further end a geometry formed on the outer circumference side or the inner circumference side as a point of attack. or engagement surface for a tool.
  • the geometry should ensure an anti-rotation of the tool relative to the valve housing to facilitate screwing the valve housing into a receiving bore of the high-pressure pump.
  • this is therefore preferably designed as a hexagon socket or Torx.
  • the further proposed for a fuel injection system of an internal combustion engine high-pressure pump, in particular plug-in pump, is characterized in that it comprises an inventive overflow valve.
  • the valve housing of the overflow valve is screwed into a receiving bore of a pump body.
  • the receiving bore preferably extends radially with respect to a cylinder bore of the pump body, in which a pump piston for limiting a pump working space is received in a liftable manner.
  • This arrangement provides an arrangement near the high pressure area of the high pressure pump so that the spill valve is capable of reducing pressure losses and dampening pressure pulsations.
  • this arrangement corresponds to the arrangement of a standard inlet nozzle, so that either such or the overflow valve according to the invention can be inserted into the receiving bore.
  • the receiving bore provided in the pump body is connected via a connecting channel, which is preferably designed as an oblique bore, to a low-pressure region in which an inlet valve is arranged.
  • a connecting channel which is preferably designed as an oblique bore
  • the inlet valve which serves to fill the pump working space with fuel, is preferably installed or installed axially with respect to the cylinder bore of the pump body of the high-pressure pump. This means that in the case of an outwardly opening inlet valve, it opens in the flow direction into the pump working chamber. This facilitates the filling of the pump working space with fuel.
  • the in the Fig. 1 shown high-pressure pump 2 is designed as a plug-in pump. It comprises a pump body 21 with a cylinder bore 22, in which a pump piston 23 is received to and fro movable.
  • the pump piston 23 defines a pump working space 24 formed in the cylinder bore 22.
  • an inlet valve 27 is provided, which is arranged in a low-pressure region 26 of the high-pressure pump 2 and opens into the pump working chamber 24.
  • fuel is supplied to the pump working chamber 24 via the inlet valve 27. This is then compressed in the delivery operation of the high-pressure pump and then fed via an outlet valve 28 to a high-pressure accumulator (not shown).
  • the high-pressure pump 2 can be connected to a supply line (not shown).
  • the connection is either via a standard inlet nozzle (not shown), which can be screwed into a receiving bore 20 of the high-pressure pump 2, or - as in the Fig. 1 represented - via a connecting piece 12, which is part of a connecting body 11 of a spill valve 1, which is screwed into the receiving bore 20 of the valve housing 8 instead of a standard inlet nozzle.
  • the inlet takes place in this case via the overflow valve 1 and the receiving bore 20, wherein the receiving bore 20 is connected via a connecting channel 25 with the low-pressure region 26.
  • valve housing 8 which is end equipped with an external thread 18 for screwing into the receiving bore 20 of the high-pressure pump 2.
  • a corresponding internal thread is formed in the receiving bore 20, a corresponding internal thread is formed.
  • the valve housing 8 at the other end has a geometry 19 which is formed as a hexagon socket for receiving a corresponding tool (see Fig. 2 or Fig. 3 ).
  • connection body 11 which forms the inlet 4 serving as connecting piece 12.
  • connection piece 12 of the connecting body 11 forms a further connection piece 13, which serves as a return 5.
  • Der Anschlußstutzen 13 ist mit dem Stanford Research 12sky.
  • the connecting body 11 is rotatably arranged relative to the valve housing 8.
  • FIG. 2 serving as inlet 4 and return 5 connecting pieces 12, 13 are arranged at an axial distance from each other.
  • radial bores 9, 10, which are formed in the valve housing 8 and on the one hand in a central bore 7 and on the other hand in the outer peripheral side annular grooves 14, 15 open to produce a hydraulic connection of the radial bores 9, 10 with the connecting pieces 12, 13.
  • the inlet thus takes place via the connecting piece 12, the annular groove 14 and the radial bore 9, so that in the central bore 7 of the valve housing 8 of the overflow valve 1 inlet pressure prevails.
  • a valve piston 3 In the central bore 7 of the valve housing 8 of the overflow valve 1, a valve piston 3 is received axially displaceable, which is acted upon in the closing direction by the spring force of a valve spring 6. In the opening direction, inlet pressure is applied. If the inlet pressure exceeds a predetermined limit, the valve piston 3 is displaced against the spring force of the valve spring 6 in the direction of the radial bore 10 until a connection between inlet 4 and return 5 is established. In the open position of the overflow valve 1, an excess amount of fuel is supplied to the return, so that the inlet pressure drops below the predetermined limit again. The spring force of the valve spring 6 then returns the valve piston 3.
  • valve spring 6 is supported on the one hand directly on the valve piston 3 and on the other hand on a closure body 29, which is for this purpose pressed into the central bore 7.
  • closure body 29 also seals the central bore 7 to the outside.
  • a seal between the connecting body 11 and the valve housing 8 of the overflow valve 1 is effected by a sealing ring 17 which is inserted into an outer peripheral side annular groove 16 of the valve housing 8.
  • connection body 11 may have a pump body 21 facing, end-side annular groove 30 for receiving a sealing ring 17 (see Fig.2 or Fig. 3 ).
  • 8 further outer peripheral side annular grooves 16 may be formed for receiving sealing rings 17 in the valve housing.
  • At least one annular groove 16 for receiving a sealing ring 17 between the two radial bores 9, 10 and between the two annular grooves 14, 15 may be arranged.
  • the connecting body 11 is designed in several parts (not shown), for example, to align the two connecting pieces 12, 13 independently by turning relative to the valve housing 8, more sealing rings 17 are provided.
  • overflow valves 1 have in common that they can be attached to either a high-pressure pump 2, in particular a plug-in pump. If the installation situation requires no overflow valve 1, instead of the overflow valve 1, a standardized inlet connection piece can be screwed into the receiving bore 20 of the high-pressure pump 2. If an overflow valve 1 is required, the inlet connection piece can be removed and an overflow valve 1 according to the invention can be used, since this also comprises a connecting piece 12 serving as an inlet 4. In addition, no changes must be made to the high-pressure pump 2 itself.

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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)
EP15200341.4A 2015-02-03 2015-12-16 Vanne de decharge de pompe haute pression, en particulier pompe enfichable et pompe haute pression comprenant une telle vanne de decharge Active EP3054144B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015201855.5A DE102015201855A1 (de) 2015-02-03 2015-02-03 Überströmventil für eine Hochdruckpumpe, insbesondere Steckpumpe, sowie Hochdruckpumpe mit einem solchen Überströmventil

Publications (2)

Publication Number Publication Date
EP3054144A1 true EP3054144A1 (fr) 2016-08-10
EP3054144B1 EP3054144B1 (fr) 2019-10-23

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EP15200341.4A Active EP3054144B1 (fr) 2015-02-03 2015-12-16 Vanne de decharge de pompe haute pression, en particulier pompe enfichable et pompe haute pression comprenant une telle vanne de decharge

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EP (1) EP3054144B1 (fr)
DE (1) DE102015201855A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019174801A1 (fr) * 2018-03-12 2019-09-19 Robert Bosch Gmbh Dispositif d'alimentation en carburant pour carburants cryogéniques

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109185253B (zh) * 2018-10-22 2020-04-21 杭州诚臻工程机械有限公司 一种电磁溢流阀

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS508319U (fr) * 1973-05-10 1975-01-28
JPH0169179U (fr) * 1987-10-28 1989-05-08
EP0347581A1 (fr) * 1988-06-18 1989-12-27 Robert Bosch Gmbh Pompe à injection pour moteurs à combustion interne
DE19810867A1 (de) * 1998-03-13 1999-09-16 Bosch Gmbh Robert Kraftstoffpumpen-Anordnung
WO2001040656A1 (fr) * 1999-11-30 2001-06-07 Robert Bosch Gmbh Systeme de vanne permettant de commander la pression d'admission d'un fluide dans une pompe a haute pression
DE102009000835A1 (de) 2009-02-13 2010-08-19 Robert Bosch Gmbh Modulare Niederdruckeinheit und modulare Pumpenanordnung
DE102012200894A1 (de) * 2012-01-23 2013-07-25 Robert Bosch Gmbh Kraftstoffhochdruckpumpe eines Einspritzsystems
DE102013200050A1 (de) * 2013-01-03 2014-07-03 Robert Bosch Gmbh Überströmventil für eine Kraftstoffpumpe

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS508319U (fr) * 1973-05-10 1975-01-28
JPH0169179U (fr) * 1987-10-28 1989-05-08
EP0347581A1 (fr) * 1988-06-18 1989-12-27 Robert Bosch Gmbh Pompe à injection pour moteurs à combustion interne
DE19810867A1 (de) * 1998-03-13 1999-09-16 Bosch Gmbh Robert Kraftstoffpumpen-Anordnung
WO2001040656A1 (fr) * 1999-11-30 2001-06-07 Robert Bosch Gmbh Systeme de vanne permettant de commander la pression d'admission d'un fluide dans une pompe a haute pression
DE102009000835A1 (de) 2009-02-13 2010-08-19 Robert Bosch Gmbh Modulare Niederdruckeinheit und modulare Pumpenanordnung
DE102012200894A1 (de) * 2012-01-23 2013-07-25 Robert Bosch Gmbh Kraftstoffhochdruckpumpe eines Einspritzsystems
DE102013200050A1 (de) * 2013-01-03 2014-07-03 Robert Bosch Gmbh Überströmventil für eine Kraftstoffpumpe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019174801A1 (fr) * 2018-03-12 2019-09-19 Robert Bosch Gmbh Dispositif d'alimentation en carburant pour carburants cryogéniques

Also Published As

Publication number Publication date
EP3054144B1 (fr) 2019-10-23
DE102015201855A1 (de) 2016-08-04

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