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
  • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
  • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
• • 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
  • F02M63/0205—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
• • 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
• • 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
  • F02M55/004—Joints; Sealings
  • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
• • 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
• • 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
• • 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
  • F02M63/0014—Valves characterised by the valve actuating means
  • F02M63/0028—Valves characterised by the valve actuating means hydraulic
• • 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
• • 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
  • F02M2200/85—Mounting of fuel injection apparatus
  • F02M2200/857—Mounting of fuel injection apparatus characterised by mounting fuel or common rail to engine

Definitions

• the invention relates to a pressure pipe socket for connecting at least one high pressure line of a common rail injection system with an inlet bore of a fuel injector.
• the invention further relates to an internal combustion engine with a common rail injection system comprising a high-pressure accumulator (common rail), at least one specified in a cylinder head injector for injecting fuel into a combustion chamber of the internal combustion engine and at least one high-pressure accumulator fed high-pressure line.
• the pressure pipe socket must be sealed against the injector.
• the pressure pipe stub which is penetrated in its longitudinal direction by a through hole, is usually located in a bore extending from a longitudinal side of the cylinder head to a port on the injector across the cylinder head.
• the pressure pipe nozzle is usually pressurized against the injector body via an element that builds up a press-fit pressure, with a cone arranged on the pressure pipe nozzle being pressed into a corresponding conical recess in the connector of the injector.
• the high pressure line by means of a nozzle on the high pressure line encompassing cap screw clamped, which is screwed into the pressure pipe socket receiving transverse bore in the cylinder head and so the pressure pipe socket axially against the am Injector body provided, the inlet channel delimiting seat presses.
• the inlet channel delimiting seat presses against the injector facing away from the cylinder head projecting end of the pressure pipe neck.
• EP 2 058 509 A1 shows pressure pipe stubs from the prior art in which the above-mentioned problem occurs.
• a pressure pipe socket of the type mentioned above is characterized in that a connectable to the inlet bore pressure pipe and a connection for the at least one high-pressure line having housing with the formation of a sliding seat are interconnected.
• an internal combustion engine with a common rail injection system comprising a high-pressure accumulator (common rail), at least one defined in a cylinder head injector for injecting fuel into a combustion chamber of the internal combustion engine and at least one of the high-pressure accumulator provided high-pressure line, which is developed such that the at least one high-pressure line via a pressure pipe connection according to the invention to an inlet bore of the injector ange- is closing, wherein the pressure pipe socket passes through a transverse bore of the cylinder head.
• a high-pressure accumulator common rail
• the pressure pipe socket comprises two components, namely the pressure pipe connectable to the inlet bore of the injector and the housing having a connection for the at least one high-pressure line, which are connected to one another by means of a sliding seat, the advantage is achieved that the pressure pipe is detached from the housing is separated in the axial direction, so that the provided at the two ends of the pressure pipe connection, namely the connection of the pressure pipe to the inlet bore of the injector and the connection of the high-pressure line to the housing, must be realized separated from each other, wherein the respective Connections applied biasing forces or the respectively applied input or contact pressures independently of each other come into effect.
• pressure tube is screwed into the injector body for connection to the inlet bore of the injector.
• the housing can be decoupled from the pressure pipe in particular by the fact that, as corresponds to a preferred embodiment, the housing has a flange with holes for fastening the housing to the cylinder head.
• the said decoupling also leads to a very good vibration damping, since any vibrations due to the connection of the housing with the pressure tube by means of said sliding seat are less strongly transmitted to the pressure tube.
• a further advantage of the invention is that the high preload forces allow secure mounting of the high-pressure lines without the risk of loosening the pressure tube or displacing the housing within the cylinder head. Due to the sliding seat, a length Immediately as a result of different thermal expansions without pre-tension loss at the pressure pipe possible.
• the sliding seat preferably comprises two substantially sealingly cooperating cylindrical sealing surfaces.
• the seal is made in particular by the choice of a very small radial clearance between the cooperating sealing surfaces, with a radial clearance of a few micrometers is preferred.
• the seal between the pressure tube and the housing is favored by a large overlap length on the sliding seat.
• the design is preferably developed in such a way that the cylindrical sealing surfaces are formed by the outer jacket of a region of the pressure tube or housing formed with reduced outer diameter and by the inner surface of a bore formed in the other part.
• the tightness of the realized by the sliding seat connection can be further increased by the radial play between see the pressure tube and the housing under the influence of the fuel pressure is further reduced and in particular almost eliminated. As a result, the leakage quantities occurring due to the annular gap can be minimized.
• a preferred development provides that the wall thickness of the region of the pressure tube formed with a smaller outer diameter is smaller than in the remaining region of the pressure tube. Due to the smaller wall thickness, the region of the pressure tube formed with a smaller outer diameter can expand in the radial direction, so that the sealing surface of the pressure tube is pressed against the sealing surface of the housing.
• a sealing element can be used, such as a PEEK ring or known from the prior art hydraulic seal packages.
• any leakage quantities can preferably be derived via a leakage discharge bore.
• the invention is preferably developed in such a way that a leakage discharge bore leads away from the transverse bore of the cylinder head, preferably in the region of the sliding seat of the pressure pipe neck.
• Pressure pipe sockets of the type described above generally have a flow restrictor.
• the flow restrictor is arranged in the housing of the pressure pipe socket.
• the bore of the pressure tube which has a smaller outer diameter is formed in an insert screwed into the housing. The insert screwed into the housing limits a cavity formed in the housing, in which the flow restrictor is arranged.
• the injector body of a not dargestell- ten injector designated by 1.
• the cylinder head is designated 2 and has a transverse bore 3, which is penetrated by a pressure pipe stub 4.
• the pressure pipe stub 4 connects high-pressure lines, not shown, which are to be connected to the high-pressure connections 5, with the inlet bore 6 formed in the injector body 1, via which high-pressure fuel is supplied to the injector nozzle.
• the pressure pipe socket 4 consists of a pressure tube 7 and a housing.
• the housing 8 of the high pressure ports 5 each obliquely away leading holes 9, which open into a cylindrical space 10 in the housing 8.
• the cylindrical space 10 is delimited by an insert piece 11 screwed into the housing 8, on whose annular end face a compression spring 12 of a flow restrictor 13 is supported.
• the displaceable in the axial direction actuator of the flow restrictor 13 is denoted by 14.
• the insert 11 has a central bore 15 in which a region 16 of the pressure tube 7 formed with a reduced outer diameter is inserted.
• the formed with a reduced outer diameter portion 16 of the pressure tube 7 and the insert 11 of the housing 8 have cooperating cylindrical sealing surfaces which are freely displaceable in the direction of the double arrow 17 relative to each other. The sealing surfaces thus form a sliding seat, which establishes the connection between the housing 8 and the pressure tube 7.
• the cylindrical space 10 of the housing 8 is connected via the formed in the pressure tube 7 central bore 18 with the supply line 6.
• the actuator 14 of the flow restrictor 13 has a blind hole 19 and is slidably guided in the cylindrical space 10 in the axial direction.
• the actuator 14 in this case has a conical transition surface 20 between its cylindrical peripheral surface and its closed end wall, with which it forms a valve sealing surface, which is connected to one at a conical cross-sectional transition between the cylindrical space 10 and the bore 18 formed valve seat 21 cooperates.
• the blind hole 19 is connected via at least one throttle bore 22 with the cylindrical space 10. Via this throttle bore 22, fuel flows from the blind hole 19 into the space 10 and from there further into the adjoining bore 18 when the actuating member 21 is lifted from the valve seat 21.
• the compression spring 12 is designed such that at a predetermined pressure difference between the not shown High pressure lines and the inlet bore 6, the actuator 14 is held in the illustrated open position. But as soon as the predetermined pressure difference is exceeded, for example, by the breakage of a pipe and an uncontrolled outflow of fuel from this line, the actuator 14 is displaced against the force of the compression spring 12 in the closed position, in which the conical valve surface 20 against the conical seat 21st is pressed and the further flow of fuel is stopped.
• the installation of the pressure pipe socket takes place in such a way that first the pressure pipe 7 is guided through the cylinder head 2 and screwed into the injector body 1 by means of a tool acting on the hexagon 23. By choosing a suitable tightening torque, the pressure tube 7 can be securely mounted in this way.
• the housing 4 is preassembled, wherein the preassembled unit, the actuator 14 of the flow restrictor 13, the compression spring 12 and the insert 11 has.
• the insert 11 is screwed by means of a thread in the housing 8, wherein a suitable high-pressure seal due to the cooperating conical sealing surfaces 24 is achieved.
• the preassembled unit is connected via the sliding seat with the pressure tube 7.
• the housing 8 is fastened with a flange, not shown, and with screws on the cylinder head 2, wherein the biasing force is so high that the tightening torque used for connecting the high-pressure line to the high-pressure connections 5 can be taken with sufficient certainty.
• the housing 8 is additionally pierced with slots through pins positioned to prevent lateral positional deviation.
• the housing 8 is sealed by means of seals 25 against the cylinder head 1. Emerging leaks are discharged via the leakage discharge bore 26.
• the pressure pipe stub 4 is received over its entire length with radial clearance in the transverse bore 3 of the cylinder head 2, so that height tolerances between the injector and the cylinder head can be compensated.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=44352392

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (9)

Family Cites Families (19)

• 2010
  • 2010-06-22 AT AT0103510A patent/AT509332B1/de not_active IP Right Cessation
• 2011
  • 2011-06-21 JP JP2013515630A patent/JP5932784B2/ja not_active Expired - Fee Related
  • 2011-06-21 WO PCT/AT2011/000272 patent/WO2011160148A1/de active Application Filing
  • 2011-06-21 CN CN201180031029.0A patent/CN103038494B/zh not_active Expired - Fee Related
  • 2011-06-21 KR KR1020137001619A patent/KR101489133B1/ko not_active IP Right Cessation
  • 2011-06-21 EP EP11730544.1A patent/EP2585706A1/de not_active Withdrawn
  • 2011-06-21 US US13/805,954 patent/US20130092131A1/en not_active Abandoned

Non-Patent Citations (1)

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