EP2795095A1 - Pumpe, insbesondere kraftstoffhochdruckpumpe für eine kraftstoffeinspritzeinrichtung - Google Patents
Pumpe, insbesondere kraftstoffhochdruckpumpe für eine kraftstoffeinspritzeinrichtungInfo
- Publication number
- EP2795095A1 EP2795095A1 EP12809781.3A EP12809781A EP2795095A1 EP 2795095 A1 EP2795095 A1 EP 2795095A1 EP 12809781 A EP12809781 A EP 12809781A EP 2795095 A1 EP2795095 A1 EP 2795095A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- drive shaft
- interior
- connection
- outlet
- 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
Links
- 239000000446 fuel Substances 0.000 title claims description 33
- 238000002347 injection Methods 0.000 title description 4
- 239000007924 injection Substances 0.000 title description 4
- 239000007788 liquid Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- F02M59/10—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 the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- 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
- F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
Definitions
- the invention is based on a pump, in particular
- High-pressure fuel pump for a fuel injection device according to the preamble of claim 1.
- Such a pump in the form of a high-pressure fuel pump is known from DE 199 07 311 AI.
- This pump has at least one pump element, which in turn has a driven in a stroke pump piston.
- the pump has a pump housing with an interior in which a drive shaft is rotatably mounted.
- the pump piston is driven by the drive shaft via a roller tappet in a stroke movement.
- fuel is supplied via an inlet and fuel can flow out of the interior via a drain.
- the connection of the interior with the drain is controlled by an overflow valve, which opens the connection of the interior with the drain when it reaches its opening pressure, so that the pressure in the interior is limited.
- the pump piston moves alternately into and out of the interior space, which generates pressure fluctuations in the interior.
- Pressure fluctuations can not or only partially be compensated by the overflow valve, whereby fuel from the interior can also be displaced into the inlet. This also leads to pressure fluctuations in the inlet of the pump, which in turn can affect the promotion of the pump, especially when the inlet to the interior is also connected to an inlet to at least one pump element. Disclosure of the invention
- the pump according to the invention with the features of claim 1 has the advantage that pressure fluctuations in the interior by the controlled depending on the stroke of the pump piston connection with the process can be better compensated.
- the embodiment of claim 2 allows a particularly effective reduction of pressure fluctuations in the interior.
- the embodiment of claim 3 allows easy control of the connection of the interior with the process without additional components.
- the embodiments according to claims 5 and 6 allow a structurally simple way to control the connection of the interior with the flow through the drive shaft.
- the embodiment of claim 7 also allows a simple way of controlling the connection of the interior with the process without additional components.
- the embodiment according to claim 8 allows a structurally simple way to control the connection of the interior with the flow through the
- FIG. 1 shows a pump in a longitudinal section
- Figure 2 is a designated II in Figure 1 section of the pump according to a first embodiment
- Figure 3 shows the detail according to a second embodiment
- Figure 4 in Figure 1 with IV designated section according to a third embodiment
- a pump is shown, in particular a
- the pump has at least one pump element 10, which in turn has a pump piston 12, which is driven at least indirectly by a drive shaft 14 in a lifting movement in at least approximately radial direction with respect to the axis of rotation 15 of the drive shaft 14.
- the drive shaft 14 is rotatably mounted in a housing of the pump, wherein the bearing points of the drive shaft 14 are designed as plain bearings 16.
- Drive shaft 14 has a cam 18 or eccentric for driving the pump piston 12.
- the pump has a multi-part pump housing.
- the pump piston 12 is tightly guided in a cylinder bore 20 of a first housing part 22 of the pump wherein the first housing part 22 is referred to below as the cylinder head. With its end facing away from the drive shaft 14 of limited
- Pumping chamber 12 in the cylinder bore 20 has a pump working chamber 24.
- the pump working chamber 24 has an inlet valve 26, which is for example an inlet check valve opening into the pump working chamber 24, a connection to an inlet 28 leading, for example, from a feed pump, via which the pump working space 24 radially inward to the axis of rotation 15 of the drive shaft 14 directed suction stroke of the pump piston 12 is filled with fuel.
- the pump working chamber 24 also has an outlet valve 30, which is for example an outlet check valve opening out of the pump working chamber 24, a connection with an outlet 32 leading, for example, to a high-pressure fuel accumulator 34 and the radially outward from the axis of rotation 15 of the drive shaft 14 directed delivery stroke of the pump piston 12 fuel from the
- the pump piston 12 is supported indirectly via a roller tappet 36 on the cam 16 of the drive shaft 14.
- a roller 37 is rotatably mounted, which runs on the cam 16.
- the pump piston 12 is connected to the roller tappet 36 in a manner not shown.
- the roller plunger 36 and with this the pump piston 12 is acted upon by a spring 38 to the cam 16 of the drive shaft 14 out, so that the roller 37 constantly, so even during the suction stroke of the pump piston 12, remains in contact with the cam 16.
- the housing of the pump has a second housing part 40, in which the drive shaft 14 can be rotatably supported via one or more bearings.
- the inlet 28 can pass through the housing part 40, in particular through an interior 42 of the housing part 40, in which the cam 16 of the drive shaft 14 is arranged, and through holes or channels in the housing part 40.
- the roller tappet 36 can in a receptacle 44 in the housing part Be guided 40, wherein the receptacle 44 may be formed as a bore.
- the fuel is conveyed into the inlet 27 by a feed pump 46, which draws fuel from a fuel tank 47.
- the feed pump may be an electrically driven pump or a mechanical, for example, together with the high-pressure fuel pump driven pump. It can be provided that the inlet 28 to the pump element 10 through the
- Interior 42 takes place, so the entire amount of fuel pumped by the pump 46 passes into the interior 42 and from this to
- a fuel metering device 48 may be provided, which may be formed for example as a proportional valve, through which a variable flow area in the inlet 28 to the pump element 10 can be adjusted.
- Fuel quantity can be variably adjusted.
- the fuel meter 48 is controlled by an electronic control unit 49.
- the interior 42 of the housing part 40 also has a drain 50, can flow through the fuel from the interior 42, for example in a return 51 to the fuel tank 47. It can be provided that a first connection of the interior 42 with the outlet 50 through a Overflow valve 52 is controlled, which opens upon reaching a predetermined pressure in the interior 42 and opens the connection to the drain 50. When the pressure in the interior 42 is below the opening pressure of thedesignrströmventils 52 this is closed and the interior 42 separated from the drain 50.
- the pump piston 12 moves with the roller tappet 36 alternately into the interior 42 and out of this, whereby the volume of the interior 42 is changed and pressure fluctuations in the
- Interior 42 are generated. In particular, if only one pump element 10 is present occur strong pressure fluctuations. If several
- Pump elements 10 are provided which do not promote synchronous, the pressure fluctuations can be kept lower.
- the interior space 42 additionally or alternatively to the connection controlled by the overflow valve 52 has at least one other connection to the outlet 50, which is controlled as a function of the stroke of the pump piston 12.
- Interior 42 with the outlet 50 is controlled in particular such that it is in the region of a central stroke of the pump piston 12 when it moves from its top dead center to its bottom dead center into the interior 42, and in other areas of the stroke of the pump piston 12th closed is.
- Drive shaft 14 has in the region of at least one of its sliding bearing points 16 on a bearing pin 54 which is rotatably mounted directly or via a bearing bush in a bore of the housing part 40.
- the bearing pin 54 connects in the axial direction of the arranged in the interior 42 cam 18 of the drive shaft 14 and the bearing pin 54 has at its the cam 18 and thus the interior 42 facing edge region in its outer jacket at least a flat 56 on.
- the flattening 56 is arranged in a peripheral region of the drive shaft 14, in which a falling edge of the cam 18 is arranged on the drive shaft 14.
- In the housing part 40 is an on the
- the bore 58 opens at its other end in the sequence 50, which is formed for example in the form of a channel or a bore in the housing part 40.
- the bore 58 extends inclined to the longitudinal axis 15 of the drive shaft 14, starting from its mouth at the sliding bearing point 16 to its mouth in the sequence 50 of the longitudinal axis 15 of the drive shaft 14 away.
- the cam 18 may be a single cam, so that with each revolution of the drive shaft 14 of the pump piston 12 executes only one suction and delivery stroke. In this case, it is sufficient if the drive shaft 14 has only one flat 56.
- the cam 18 may also be a multiple cam, such as a double or triple cam, the pump piston 12 in these cases, several suction and delivery strokes with each revolution of the drive shaft 14 from.
- the drive shaft 14 has a plurality of, preferably corresponding to the number of suction strokes of the pump piston 12 per revolution of the drive shaft 14 selected flats 56, so that the interior is connected to the drain 50 at each suction stroke of the pump piston 12.
- the drive shaft 14 has on the outer surface of its journal 54 in the Slide bearing 16 at least one flattening 60, which is arranged in a direction remote from the cam 18 in the axial direction edge region of the journal 54.
- In the housing part 40 is at the sliding bearing 16 in the region of the outer shell of the bearing journal 54 of the drive shaft 14 in the cam 18 facing away from the edge opening channel, in particular in the form of a bore 62 is provided.
- the bore 62 opens at its other end into the interior 42.
- the bore 62 extends inclined to the longitudinal axis 15 of the drive shaft 14, starting from its mouth at the sliding bearing 16 to its mouth in the interior 42 of the longitudinal axis 15 of the drive shaft 14 away.
- Housing part 40 is a space formed, which is connected to the drain 50.
- the function of controlling the communication of the inner space 42 with the drain 50 through the drive shaft 14 is the same as described in the first embodiment. It can also be provided a plurality of flats 60 corresponding to the number of suction strokes of the pump piston 12 per revolution of the drive shaft 14.
- a bore 66 which is connected at its other end to the drain 50.
- Roller plunger 36 or a plunger body of the roller tappet 36 is cup-shaped, wherein the bottom 67 of the drive shaft 14 faces and the roller tappet 36 is guided over a subsequent to the bottom 67 on the drive shaft 14 side facing jacket 68 in the receptacle 44.
- the bottom 67 at least one opening 69 is provided, which allows a flow through the roller tappet 36 in Hubbwegung in the receptacle 44.
- an opening 70 for example in the form of a bore provided.
- the opening 70 is arranged in the same circumferential region of the receptacle 44 as the bore 66, so that the opening 70 comes into coincidence with the bore 66 during the lifting movement of the pump piston 12 and thus of the roller tappet 36.
- the jacket 68 of the roller tappet 36 at the mouth of the opening 70 has a flattening or groove 72 surrounding the mouth, which is in particular in Direction of the longitudinal axis of the roller tappet 36 extends.
- Flattening or groove 72 may be provided instead of the roller tappet 36 at the mouth of the bore 66 in the receptacle 44.
- the cross-section of the connection which as described above is controlled by the drive shaft 14 via the at least one flat 56 or by the roller tappet 36 via the opening 70, is dimensioned so that at all rotational speeds of the drive shaft 14 sufficient for the heat dissipation of the pump Amount of fuel from the interior 42 can flow.
- the outflowing amount of fuel should not be too large, otherwise too much energy must be expended for fuel transport.
- the cross-section of the connection may be designed to achieve an average outflowing fuel quantity of between about 50 and 70 l / h.
- the cross-section of the connection is designed, for example, such that when the connection is open, an instantaneous fuel outflow of between about 100 l / h to about 500 l / h is made possible.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110089399 DE102011089399A1 (de) | 2011-12-21 | 2011-12-21 | Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung |
PCT/EP2012/075994 WO2013092614A1 (de) | 2011-12-21 | 2012-12-18 | Pumpe, insbesondere kraftstoffhochdruckpumpe für eine kraftstoffeinspritzeinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2795095A1 true EP2795095A1 (de) | 2014-10-29 |
EP2795095B1 EP2795095B1 (de) | 2016-03-16 |
Family
ID=47501230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12809781.3A Active EP2795095B1 (de) | 2011-12-21 | 2012-12-18 | Pumpe, insbesondere kraftstoffhochdruckpumpe für eine kraftstoffeinspritzeinrichtung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2795095B1 (de) |
CN (1) | CN104011368B (de) |
DE (1) | DE102011089399A1 (de) |
WO (1) | WO2013092614A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014016526A1 (de) * | 2014-10-30 | 2016-05-04 | Khs Corpoplast Gmbh | Vorrichtung zum Pumpen einer Flüssigkeit in einer Flüssigkeitsleitung |
GB201520698D0 (en) * | 2015-11-24 | 2016-01-06 | Delphi Internat Operations Luxembourg S À R L | Fuel Pump |
WO2018178502A1 (en) * | 2017-03-29 | 2018-10-04 | Wärtsilä Finland Oy | A fuel pump for supplying fuel to an internal combustion piston engine |
WO2018178500A1 (en) * | 2017-03-29 | 2018-10-04 | Wärtsilä Finland Oy | A fuel pump for supplying fuel to an internal combustion piston engine |
GB2604907A (en) * | 2021-03-18 | 2022-09-21 | Caterpillar Motoren Gmbh & Co | High pressure fuel pump lubrication method and apparatus |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19907311A1 (de) | 1999-02-22 | 2000-08-31 | Bosch Gmbh Robert | Hydraulikpumpeneinheit |
WO2002097268A1 (de) * | 2001-05-26 | 2002-12-05 | Robert Bosch Gmbh | Hochdruckpumpe für ein kraftstoffsystem einer brennkraftmaschine |
US6722864B2 (en) * | 2001-12-12 | 2004-04-20 | Denso Corporation | Fuel injection pump |
JP3788373B2 (ja) * | 2002-03-11 | 2006-06-21 | 日産自動車株式会社 | 高圧燃料ポンプの給油装置 |
DE102005014093A1 (de) * | 2005-03-29 | 2006-10-05 | Robert Bosch Gmbh | Zweipunktregelung einer Hochdruckpumpe für direkteinspritzende Ottomotoren |
JP5642925B2 (ja) * | 2008-08-20 | 2014-12-17 | 日産自動車株式会社 | 高圧燃料ポンプ |
-
2011
- 2011-12-21 DE DE201110089399 patent/DE102011089399A1/de not_active Withdrawn
-
2012
- 2012-12-18 EP EP12809781.3A patent/EP2795095B1/de active Active
- 2012-12-18 WO PCT/EP2012/075994 patent/WO2013092614A1/de active Application Filing
- 2012-12-18 CN CN201280063393.XA patent/CN104011368B/zh active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2013092614A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2013092614A1 (de) | 2013-06-27 |
CN104011368A (zh) | 2014-08-27 |
EP2795095B1 (de) | 2016-03-16 |
CN104011368B (zh) | 2017-04-05 |
DE102011089399A1 (de) | 2013-06-27 |
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