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
  • 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
• • 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
  • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
  • F02M53/02—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means with fuel-heating means, e.g. for vaporising
• • 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
  • 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
• • 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
  • F02M63/0052—Pressure relief valves with means for adjusting the opening pressure, e.g. electrically controlled

Definitions

• the invention relates to a valve arrangement for an internal combustion engine working with accumulator pressure according to the preamble of claim 1.
• valve arrangement of the aforementioned type is known from DE 19645243 C2.
• this valve arrangement comprises an outflow valve located between it, in the form of a so-called common rail, and a low-pressure chamber, which is open for the circulation of heated heavy oil during the idle period of the internal combustion engine and that when the internal combustion engine is started and during its operation closed is.
• the valve member of the outflow valve is loaded via a pressurized control medium towards its closed position and held in this closed position, namely against the pressure in the pressure accumulator and against the force of a spring acting in the opening direction of the valve member, which the valve member in the event of failure of the Control pressure in the open position.
• the invention has for its object to improve a valve assembly of the type mentioned in terms of maintaining the closed position of the closing member.
• valve arrangement according to claim 1.
• This uses the injection medium in the pressure accumulator under operating pressure in a direct manner to act on the valve member of the outflow valve in the outflow direction and thereby fix it in its closed position.
• the transfer to the closed position can be initiated or carried out by pressurizing an actuating piston connected to the valve member, or via another Actuating device, for example also a magnetic actuator, since corresponding closing forces only have to be applied for a short time in this way.
• the starting voltage can also be used to actuate this magnet, for example in the case of an electrically started motor, in both cases a combined action of the closing element in the direction of its closed position combined with the charging of the pressure accumulator during the starting process, which with Increasing pressure in the pressure accumulator is accompanied by pressurization of the valve member in the direction of its closed position, so that the required sealing forces no longer have to be applied via the actuator when normal operation of the internal combustion engine begins, and upon the end of the starting process also on the load on the valve member in the direction can be dispensed with its closed position by the actuator.
• valve arrangement in the solution according to the invention is thus without further
• Switching elements are kept in their closed position during operation, and all that is required for the starting process is to branch off a negligible proportion of the respective starting energy for actuating the actuator.
• the invention is not tied to solutions and is restricted to solutions in which the actuator and starting operation are tied to the same energy source, be it electrical power supply or compressed air generation.
• Piston rod connection between the actuator, in particular its actuating piston or positioning armature for the valve stem of the valve member, is expediently designed in a form which enables the integration of the outflow paths, an embodiment according to the invention proving to be expedient, in which the connections to both the supply and the head part of the valve arrangement to which the pressure chamber is assigned can be assigned to the pressure chamber as well as to the outlet side.
• a construction of the outflow valve according to the invention is expedient, in which it is essentially constructed from overlapping cylindrical bushes or sleeve parts on the housing side, so that simple turned parts can be used.
• FIG. 2 shows an enlarged, separate illustration of the outflow valve as such.
• a pressure accumulator 1 in the form of a so-called common rail, which is sealed with respect to a valve arrangement 2 by a bush 3, which is the carrier of a bush neck 4, which serves as a receptacle for an outflow valve 5.
• the outflow valve 5 comprises, as shown in particular in FIG. 2, a sealing cone 6 which is clamped with a union nut 7 against a ring shoulder 9 of an intermediate piece 8 which is coaxial to the sealing cone 6 and which, together with the latter, transitions from the ring shoulder 9 to the sealing cone 6 Valve chamber 10 limited, in which the valve head 11 of a valve member 40 is located.
• valve head 11 is located at the end of a valve stem 12 of the valve member 40, which is screwed coaxially against a piston rod 13, which passes through the guide neck 14 of the head part 15 of the outflow valve 5, which in turn in a guide bore 16 of the intermediate piece 8 lies, namely opposite to the ring shoulder 9, the intermediate piece 8 adjacent to the ring shoulder 9 having an enlarged radial collar 17.
• the intermediate piece 8 thus forms a receiving sleeve 18 for the guide neck 14, the outer diameter of the receiving sleeve 18, like the outer diameter of the ring shoulder 9, being smaller than the outer diameter of the radial collar 17, via which the intermediate piece 8 in the sleeve neck 4 is led.
• the head part 15 is provided with a stop collar 19, to which the free end face of the receiving sleeve 18 is assigned as a counterpart.
• the pressure accumulator 1 is provided in its wall with an outflow bore 23, which widens radially outward to a receiving cone 24 to which the sealing cone 6 corresponds.
• the sealing cone 6 is clamped axially into the receiving cone 24, the corresponding tension being achieved via the intermediate sleeve 20, which, designed as a threaded sleeve over a partial area, is screwed into the socket neck 4, as indicated at 25 as a screw connection, and axially on the Radial collar 17 of the intermediate piece 8 is supported, which in turn acts axially on the sealing cone 6 via the ring shoulder 9, the sealing of the im Transition from the ring shoulder 9 to the sealing cone 6 formed valve chamber 0 is ensured by axially bracing the sealing cone 6 against the ring shoulder 9 via the union nut 7.
• the sealing cone 6 is provided with a bore 26 which corresponds to the bore 23.
• Axial channels 27 extend from the valve chamber 10 and connect to the annular channel 21, in the lower area thereof.
• the receiving sleeve 18 has cross bores 28 which open out onto an annular channel 29 which extends into the outer circumference of the
• Guide neck 14 is pierced and from which a channel 30 branches off, which opens out on a drain-side supply connection 31.
• This supply connection 31 is assigned to the head part 15, which is preferably formed by a mushroom-shaped widening of the guide neck 14.
• An actuator 41 with a pressure chamber 32 is also assigned to the head part 15, concentrically with the piston rod 13
• Control piston 33 is arranged which is spring-loaded in the direction of the valve chamber 10, in the exemplary embodiment via a spring 34.
• a pressure-side supply connection 35 is assigned to the pressure chamber 32, via which the control piston 33 can be pressurized with fluid under pressure against the force of the spring 34 , wherein in particular compressed air is used in connection with large-piston internal combustion engines that are started via compressed air.
• the head part 15 is assigned a cover-like cover, which is denoted by 36 and which also makes it possible to insert the piston 33 into the head part 15 via the cover side next to the spring.
• This in turn can also be connected to the piston rod 13 via a screw connection or the like, starting from the cover side.
• This is screwed against the valve stem 12, the screw connection preferably being located in a free area of the receiving bore 16 lying axially below the guide neck 14, so that the screwing area can be made larger in diameter than the receiving bore for the piston rod 13 passing through the guide neck 14.
• the guide neck 14 can thus be threaded onto the piston rod 13 and at the same time threaded into the receiving sleeve 18 and subsequently the head part 15 is braced against the intermediate piece 8 via the threaded connection 37 between the receiving sleeve 18 and the guide neck 14 become.
• the outflow valve 15 thus forms an easy-to-assemble structural unit, which can also advantageously be clamped via the intermediate sleeve 20 relative to the socket 4 via the screw connection 25, the seals indicated in the figures between the individual parts illustrating that the overall structure described also good conditions for a simple design of the mutual seals.
• the valve head 11 is shown in the representations according to FIGS. 1 and 2 in the valve chamber 10 in its lower opening position, which is predetermined by the load via the spring 34, in which the support against the force of the spring 34 by contacting a conical boundary surface 38 of the valve chamber 10 takes place, which lies over the transition to the bore 26.
• transverse grooves 39 or similar recesses are provided which, in the support position shown opposite the boundary surface 38, which corresponds to an open position of the outflow valve, connect the bore 26 via the valve chamber 10 to the channels 27 and from there to the supply connection 31 on the outlet side release. If the actuating piston 33 is pressurized with pressure fluid via the supply connection 35, the valve head 11 is moved into its upper stop position, not shown, and delimits the valve chamber 10 in a sealing manner from the outlet side.
• valve head 11 If pressure is now present within the pressure accumulator 1, the valve head 11 is also acted upon by the valve head 11 in the direction of its closed position, so that, with a corresponding adjustment of the spring 34 acting in the opening direction of the valve head 11, to the valve head 11 which is dependent on the pressure in the pressure accumulator 1 in its closed position in In the closing direction, that is to say a compressive force loading in the opposite direction, a limit pressure can be set at which the valve head 11 is held in its closed position by the pressure in the pressure accumulator 1.
• An internal combustion engine works when equipped with an inventive one
• Valve arrangement is equipped with compressed air starting, it is advisable to connect the pressure chamber 32 on the supply side during the starting phase to the corresponding compressed air source and thus to branch off a small part of the energy required for the starting for the locking function. If a sufficient pressure level is built up in the pressure accumulator in this way, the pressure in the pressure accumulator 1 is sufficient for the valve head 11 to remain in its closed position and no further, constantly pending locking energy is required.
• the outflow valve 5 falls back into its open position as soon as the pressure in the pressure accumulator 1 falls below a predetermined lower limit, so that a safety function is also guaranteed.
• valve head With a valve arrangement of the type described above, the flushing operation required in the case of internal combustion engines operated with heavy oil can also be carried out in a favorable manner.
• the valve head In this operating phase, the valve head is in its
• Open position and the heated flushing medium, especially the heated heavy oil can circulate through the injection system in the circuit and thereby raise it to a temperature level at which the engine can be started and operated.
• an actuating piston system is provided as the actuator.
• magnetic actuators or other actuating systems magnetic actuators being particularly useful when working with electrical starting of the internal combustion engine, so that the magnetic actuator is addressed when starting and accordingly is controlled.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)
• Safety Valves (AREA)
• Valve Device For Special Equipments (AREA)
• Magnetically Actuated Valves (AREA)
• Compressor (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=7657793

Family Applications (1)

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• 2000
  • 2000-09-25 DE DE10047805A patent/DE10047805B4/de not_active Expired - Fee Related
• 2001
  • 2001-09-22 DE DE50109231T patent/DE50109231D1/de not_active Expired - Lifetime
  • 2001-09-22 EP EP01974283A patent/EP1320677B1/fr not_active Expired - Lifetime
  • 2001-09-22 AT AT01974283T patent/ATE320556T1/de active
  • 2001-09-22 WO PCT/EP2001/010967 patent/WO2002025099A1/fr active IP Right Grant
  • 2001-09-22 JP JP2002528671A patent/JP3768189B2/ja not_active Expired - Lifetime

Non-Patent Citations (1)

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