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
• • 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
  • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
• • 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
  • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing

Definitions

• the invention relates to a pump, in particular high-pressure fuel pump, according to the preamble of claim 1.
• a pump in the form of a high-pressure fuel pump is through the
• This pump has a housing part in which a pump piston is movably arranged in a cylinder bore, which delimits a pump working chamber in the cylinder bore.
• the pump has an inlet valve, which is arranged in the housing part and through which the pump working chamber can be connected to an inlet for conveying medium. In the inflow is a
• the inlet partly runs through a low-pressure module in which the metering device is arranged and which is connected to a basic housing part of the pump. On the low-pressure module, a connection for the inlet is arranged, for example, from one
• Feed pump can lead to low pressure module.
• the inlet runs from the metering device in the low-pressure module through the basic housing part of the pump to the inlet valve arranged in the housing part.
• a disadvantage of this pump is the complicated course of the inlet through the main housing part of the pump, whereby their production is complicated and expensive. If the pump is no
• the pump according to the invention with the features of claim 1 has the advantage that the low pressure module can be easily connected directly to the housing part of the pump and no costly holes or the like are required for the feed, directly from the low pressure module by the cylindrical approach of Housing part leads to the inlet valve.
• the pump is thus simple, inexpensive and compact in size.
• FIG. 2 shows the pump in a view in the direction of arrow II in Figure 1
• Figure 3 shows the pump with the low-pressure module according to a second embodiment.
• FIG. 1 shows a pump which is in particular a high-pressure fuel pump for a fuel injection device of an internal combustion engine.
• the pump has a housing part 10, which is referred to below as the cylinder head.
• the cylinder head 10 has a cylinder bore 12 in which a pump penkolben 14 slidably guided tight.
• the pump piston 14 defines with its protruding into the cylinder bore 12 end of a pump working chamber 16.
• the protruding from the cylinder bore 12 end of the pump piston 14 is connected to a transmission device, for example in the form of a roller tappet 20.
• the roller tappet 20 is supported on a cam 22 of a drive shaft 24, through which a rotational movement of the pump piston 14 in the cylinder bore 12 is effected during the rotational movement of the drive shaft 24.
• the drive shaft 24 may be part of the pump or part of the internal combustion engine, such as the camshaft or another shaft.
• the pump working chamber 16 can be connected via an inlet valve 26 to a low-pressure inlet 27 to the pump and via an outlet valve 28 to a high-pressure outlet which leads, for example, to a high-pressure accumulator 30.
• the low-pressure inlet 27 can be fed, for example, from a feed pump, which sucks fuel from a reservoir.
• the inlet valve 26 has a valve housing 32 and is designed as a check valve.
• the inlet valve 26 has a piston-shaped valve member 34, which is guided via its shaft 36 in the valve housing 32 and which cooperates with a formed at its diameter in relation to the shaft 36 enlarged head 38 sealing surface with a valve housing 32 formed on the valve seat.
• the valve member 34 is acted upon by a closing spring 40 in the closing direction.
• the cylinder head 10 is inserted in a receptacle 44 of a basic housing of the pump or a housing of the internal combustion engine, for example, the cylinder head or engine block, wherein the receptacle 44 is formed for example as a bore.
• the cylinder head 10 in this case has a flange-like region 46, which has a larger cross section than the receptacle 44 and on which the receptacle 44 surrounding outside rests.
• a projecting through the receptacle 44 extension 48 connects, in which the cylinder bore 12 extends and from which the connected to the roller tappet 20 end of the pump piston 14 protrudes.
• a hollow cylindrical projection 50 connects to the cylinder head 10, which extends at least approximately coaxial with the cylinder bore 12.
• the valve housing 32 of the inlet valve 26 is inserted from the cylinder bore 12 facing away from the outside in the hollow cylindrical projection 50, wherein the valve housing 32 rests against an annular shoulder 52 of the cylinder head 10 formed at the transition from the cylinder bore 12 to the projection 50.
• a closure screw 56 is inserted into the projection 50, which has an external thread which cooperates with an internal thread of the projection 50. By the screw plug 56, the valve housing 32 is pressed against the annular shoulder 52 to seal the pump working chamber 16 to the approach 50 out.
• valve 52 may be disposed between the valve housing 32 and the annular shoulder a sealing ring.
• the closure screw 56 has, on its inner side facing the valve housing 32, a central recess 58 in which the end of the shaft 36 of the valve member 34 projecting from the valve housing 32 and the closing spring 40 are arranged.
• Provided in the circumference of the valve housing 32 are at least one or preferably a plurality of inlet bores 60 distributed over the circumference, through which fuel enters the inlet valve 26.
• the valve housing 32 is surrounded in the projection 50 by an annular groove 62, into which the inlet bores 60 open.
• the annular groove 62 is connected to the outer periphery of the lug 50 via at least one bore 64 extending through the lug 50.
• a nozzle 66 is formed, in which the outlet valve 28 is arranged. At the nozzle 66 leading to the memory 30 hydraulic see line can be connected.
• a low pressure module 70 is provided, through which the inlet 27 extends to the inlet valve 26.
• the low-pressure module 70 has a module housing 72, which is connected to the cylinder head 10 and which is placed on the hollow cylindrical projection 50 of the cylinder head 10.
• the module housing 72 is made of a lightweight material such as light metal such as aluminum or an aluminum alloy or plastic.
• the module housing 72 has an approximately cylindrical shape, which is placed on the projection 50 of the cylinder head 10 and a recess 50 receiving the recess 74 has.
• the module housing 72 bears against the flange-like region 46 of the cylinder head 10 and between the module housing 72 and the region 46 a sealing element 76, for example in the form of a sealing ring, is clamped.
• the module housing 72 may, for example, be pressed onto the cylinder head 10 or fastened to the cylinder head 10 by means of a latching connection or via at least one or more screws.
• Metering device 80 is formed, for example, as a proportional valve, can be adjusted by the differently sized flow cross-sections.
• the metering device 80 has a housing in which a piston 82 is arranged, through which the flow cross-section between a in the
• Metering 80 opening inlet and a laxative from this flow is set.
• the piston 82 is displaceable against a spring 85 by means of an electrical actuator 84, for example an electromagnet.
• an electrical actuator 84 for example an electromagnet.
• the feed into the metering device 80 takes place at least approximately radially to the longitudinal axis 83 of the piston 82 and the drain leads at least approximately coaxially to the longitudinal axis 83 of the piston 82 from the metering device 80 and opens into the recess 74 of the module housing 72.
• an annular space is formed, so that fuel can pass from the recess 74 via the bore 64 in the projection 50 to the inlet valve 26.
• an electrical terminal 81 is arranged for connection to an electronic control device, by which the actuator 84 is driven.
• the metering device 80 is arranged so that the longitudinal axis 83 of the piston 82 at least approximately coaxial with the cylinder bore 12 extends.
• the module housing 72 has an at least approximately radially to the recess 74 outwardly projecting projection 86 with a bore 87.
• a connecting piece 88 is inserted, for example, pressed.
• the connection piece 88 can be connected to a hydraulic line which, for example, leads from a delivery pump to the low-pressure module 70.
• the bore 87 in the module housing 72 is connected via a further bore 89 with the metering device 80, wherein the further bore 89 in a piston 82 of the
• the annular space 90 and the bore 87 can be arranged offset to one another in the direction of the longitudinal axis 83 of the piston 82, so that the further bore 89 extends correspondingly obliquely in the module housing 72.
• the pump fuel passes, for example, from a supply pump from a reservoir via the connecting piece 88 into the bore 87 in the module housing 72 and from there via the further bore 89 in the annular space 90. From the annular space 90 of the fuel passes through the piston 82 of the The coaxial arrangement of the piston 82 of the metering device 80 to the inlet valve 26, which in turn is coaxial is arranged to the cylinder bore 12, a favorable inflow of the fuel is achieved. During the suction stroke of the pump piston 14, the inlet valve 26 opens, so that fuel flows into the pump working chamber 16.
• the amount of fuel flowing into the pump working chamber 16 via the inlet valve 26 during the suction stroke of the pump piston 14 depends on the flow cross section set by the piston 82 of the metering device 80. If no fuel is to be delivered by the pump, the metering device 80 is closed so that it blocks the flow cross-section. If, due to leakage of the metering device, fuel still reaches the pump and is pumped through it, the excess fuel delivered can be discharged by suitable measures in the fuel injector.
• a spill valve may be arranged by the pump from the pump too much subsidized fuel, not by the
• Metering device 80 is supplied to the pump, can be derived.
• the overflow valve is not arranged on the low pressure module 70, but for example on the feed pump.
• the connecting piece 88 is arranged as the only hydraulic connection and the electrical connection 81 for the
• Metering device 80 is provided. Further hydraulic connections, for example for a return, are not provided.
• the low-pressure module 70 can be placed in any rotational positions on the cylinder head 10 due to the circular cylindrical design of the projection 50 of the cylinder head 10, via the recess 74 and existing between this and the neck 50 of the cylinder head 10 annulus always a connection between the flow of the metering device 80 and the inlet valve 26 is present.
• FIG. 3 shows the pump with the low-pressure module 170 according to a second exemplary embodiment.
• the cylinder head 10 of the pump is the same as in the first embodiment, but the low-pressure module 170 is formed differently and the metering device 180 is arranged differently.
• the metering device 180 is arranged differently.
• Module housing 172 according to the second embodiment is flatter than in the first embodiment and has a flange 173 with an opening 174, wherein the module housing 172 is mounted on the cylinder head 10 so that its opening 174 surrounds the projection 50 of the cylinder head 10. Laterally to the flange 173 then the module housing 172 has a
• Projection 186 at the end in a bore 187 of the connecting piece 88 is inserted.
• a further opening 178 is provided in the module housing 172, in which the
• the opening 178 is aligned with its longitudinal axis at least approximately parallel to the longitudinal axis of the opening 174.
• the bore 187 is followed in the module housing 172 by a further bore 189, which opens into a piston 82 of the metering device 80 radially surrounding annular space 190.
• a space 191 is formed, into which the outlet of the metering device 80 opens and which is connected to a bore 192 opening into the opening 174.
• an annular space is formed between the projection 50 and the opening 174 in the flange 173 of the module housing 172.
• a sealing element 76 is arranged between the flange 173 of the module housing 172 and the flange-like region 46 of the cylinder head 10.
• a sealing element 193 for example in the form of a sealing ring arranged.
• a sealing element 194 for example in the form of a sealing ring, is arranged between the closure screw 56 and the inner jacket of the extension 50.
• the low-pressure module 170 can be connected as a result of the circular cylindrical design of the projection 50 of the cylinder head 10 in any rotational positions with the cylinder head 10. Irrespective of the rotational position of the low-pressure module 70, a connection between the bore 192 of the module housing 172 with the bore 64 of the projection 50 and thus with the inlet valve 26 is always present via the annular space present between the projection 50 and the opening 174 of the flange 173.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Fuel-Injection Apparatus (AREA)
• Details Of Reciprocating Pumps (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=51224919

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Citations (3)

Family Cites Families (10)

• 2013
  • 2013-08-30 DE DE201310217357 patent/DE102013217357A1/de not_active Withdrawn
• 2014
  • 2014-07-17 WO PCT/EP2014/065390 patent/WO2015028196A1/de active Application Filing
  • 2014-07-17 JP JP2016537177A patent/JP6175567B2/ja not_active Expired - Fee Related
  • 2014-07-17 CN CN201480047912.2A patent/CN105492756B/zh active Active
  • 2014-07-17 EP EP14742485.7A patent/EP3039282B1/de not_active Not-in-force

Patent Citations (3)

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