EP0678161A1 - Fuel-injection distributor pump for internal-combustion engines. - Google Patents
Fuel-injection distributor pump for internal-combustion engines.Info
- Publication number
- EP0678161A1 EP0678161A1 EP95900049A EP95900049A EP0678161A1 EP 0678161 A1 EP0678161 A1 EP 0678161A1 EP 95900049 A EP95900049 A EP 95900049A EP 95900049 A EP95900049 A EP 95900049A EP 0678161 A1 EP0678161 A1 EP 0678161A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- cylinder bore
- pistons
- cylinder
- stop
- 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
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
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
-
- 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
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
- F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
Definitions
- the invention is based on a distributor fuel injection pump for internal combustion engines according to the category of patent claim 1.
- a distributor fuel injection pump known from EP-B 0 382 388
- a drive shaft drives a rotor guided in a housing in which two pump piston pairs, each guided in a cylinder bore, are arranged in a radial plane to the drive shaft.
- the arranged in a common radial plane of the rotor cylinder bores intersect at right angles, so that the individual pump pistons with their radially inward-facing end faces a common pump working space in the overlapping area of the Limit cylinder bores.
- the pump pistons run with their ends protruding from the cylinder bores by means of a roller tappet on a stationary cam track of a cam ring guided in the housing, so that they are set in a reciprocating stroke movement when the rotor rotates, during which they are moved during the radially outward suction stroke movement open the connection of the cylinder bore with a filling line starting from a low pressure chamber, which is then closed in the subsequent delivery stroke by the pump pistons.
- the fuel compressed in the common pump work space during the delivery stroke then passes via a high-pressure channel in the rotor to a distributor bore which radially discharges it and, during the rotational movement of the rotor, overlaps the individual high-pressure delivery lines to the injection points.
- the pump piston pairs in the two cylinder bores are designed so that a longer pair of pistons guided in a first cylinder bore protrudes into the second cylinder bore with its end facing the pump working space and the shorter piston pair guided there does not reach the first cylinder bore even in its maximum delivery stroke position .
- the known distributor fuel injection pump has the disadvantage, however, that the cam stroke that is the same for all pump pistons must be smaller than half the diameter of the cylinder bores of the same size. This is necessary there to ensure that the long pistons are still immersed in the second cylinder bore even in their maximum suction stroke position in order for the shorter pistons to move independently between the long pistons when the internal combustion engine is switched off and the pump is depressurized. Avoid working space safely, since this would otherwise lead to mechanical destruction of the distributor injection pump during operation.
- the distributor fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that a stop at the end of the shorter pump piston protruding from the cylinder bore can prevent the undesired sliding into the cylinder bore between the long pump pistons.
- This increase in the delivery stroke can advantageously be converted into an increase in the injection pressure or a larger delivery amount.
- the stop on the short pump piston is advantageously arranged in such a way that it allows them to be immersed in the cylinder bore leading them until their end face facing the pump work space has approached to a small extent the second cylinder bore so that large delivery heights are reached to let.
- the stop on the short pump piston can be easily by a collar or in an annular groove Carry out locking ring on the shaft of the short pistons, which then interact in a simple manner with the end wall of the cylinder bore.
- FIG. 1 shows a longitudinal section through the part of the distributor fuel injection pump that is essential to the invention
- FIG. 2 shows a first embodiment of the pump piston lock by means of a collar in a section from FIG. 1
- FIG. 3 shows a second embodiment of the pump piston lock using a lock ring in a representation similar to that shown in FIG. 2.
- a piston-shaped rotor part '1 is rotatably supported about its axis in a cylinder bore 2 of a cylindrical, fixed to the pump housing 3 guide member.
- the rotor part 1 has at its one end a part 7 with a larger diameter, which is connected non-rotatably to a drive shaft 9 driven synchronously with the engine speed and in which two through bores 11 intersecting at right angles in a common radial to the axis of the rotor part 1 extending plane are arranged.
- a delivery channel 13 leads off in the axis of the rotor part 1, which contains a check valve 15 and whose end merges into a radially extending distributor bore 17.
- the guide part 5 has injection lines 19 which, starting from the cylinder bore 2, lead to the individual injection points of the internal combustion engine.
- the injection lines 19 are distributed according to the number of injection points to be supplied and at a corresponding distance from one another on the circumference of the guide part 5.
- the radial through bores 11 in the diameter-enlarged part 7 of the rotor part 1 are designed as cylinder bores, in which, as can also be seen in FIGS. 2 and 3, two pump pistons lying opposite one another and working against one another are arranged.
- a first cylinder bore 25 receives a first pair of pump pistons 27 in its axial extent, the pump pistons 27 of which are made so long that they protrude during the radially inward-directed conveying stroke movement into the region of a second cylinder bore 29 that intersects the first .
- this second cylinder bore 29 is a second shorter pair of pump pistons 31, the pump pistons 31 of which are dimensioned such that they do not protrude into the region of the first cylinder bore 25 even in the maximum delivery stroke position.
- the pump pistons 27, 31 delimit a common pump working space 33 in the cylinder bores 25, 29, which can be connected to the injection lines 19 and the fuel supply line 23 via the delivery channel 13.
- the pump pistons 27, 31 each abut a roller plunger 35, the roller 37 of which runs on a cam track 39 of a cam ring 41 located in the radial plane and guided in the pump housing 3.
- the pump pistons 27, 31 are held in contact with the roller tappets 35 by the centrifugal force when the distributor fuel injection pump is in operation.
- the pump pistons 27, 31 can move independently in the cylinder bores 25, 29, depending on the position of the rotor part 1.
- the short pump pistons 31 In order to avoid with certainty that a short pump piston 31 slips between the long pump pistons 27 into the area of the first cylinder bore 25, the short pump pistons 31 have a stop at their radial ends projecting from the second cylinder bore 29, which stops with the respective axial end wall 49 of the cylinder bore 29 cooperates.
- this stop is designed as a collar 43 formed by enlarging the cross section.
- the axial end stop on the short pump piston 31 is formed by a locking ring 45 which is located in an annular groove 47 on the cylinder bore 29. projecting end of the short pump piston 31 is guided and also cooperates with the axial end wall 49 of the cylinder bore 29.
- the distributor fuel injection pump according to the invention operates in the following manner.
- the pump pistons 27, 31 are in indefinite positions, depending on the position of the rotor part 1, when the pump work chamber 33 is depressurized, which can also be the respective maximum stroke positions.
- the rotor part 1 is set into a rotating movement by the drive shaft 9, as a result of which the pump pistons 27, 31 are brought into contact with the roller tappets 35 by centrifugal force, which in turn run on the cam track 39 and thus set the pump pistons 27, 31 in a reciprocating motion in the cylinder bores 25, 29.
- the fuel compressed in the pump working chamber 33 during the delivery stroke of the pump pistons 27, 31 is guided via the delivery channel 13 and the check valve 15 to the distributor bore 17, from where it is supplied to the respective injection points when the individual injection lines 19 are passed over.
- the supply line 23 from the low pressure chamber is at the time of the high pressure promotion closed, this closing can be done via a solenoid valve arranged in the feed line 23 or the immersion of the suction bore 21 from the overlap with the feed bore 23.
- the end of the high-pressure delivery is regulated by opening the connection between the supply line 21 and the fuel supply line 23 again.
- the high-pressure residual fuel initially flows back into the low-pressure chamber before the pump pistons 27, 31 are refilled during the suction stroke of the pump work chamber 33, the check valve 15 ensuring a constant stand pressure in the distributor bore 17 and the injection lines 19.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4338344A DE4338344A1 (en) | 1993-11-10 | 1993-11-10 | Distributor fuel injection pump for internal combustion engines |
DE4338344 | 1993-11-10 | ||
PCT/DE1994/001267 WO1995013469A1 (en) | 1993-11-10 | 1994-10-28 | Fuel-injection distributor pump for internal-combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0678161A1 true EP0678161A1 (en) | 1995-10-25 |
EP0678161B1 EP0678161B1 (en) | 1996-09-04 |
Family
ID=6502237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95900049A Expired - Lifetime EP0678161B1 (en) | 1993-11-10 | 1994-10-28 | Fuel-injection distributor pump for internal-combustion engines |
Country Status (8)
Country | Link |
---|---|
US (1) | US5592920A (en) |
EP (1) | EP0678161B1 (en) |
JP (1) | JPH08505681A (en) |
KR (1) | KR100333453B1 (en) |
DE (2) | DE4338344A1 (en) |
ES (1) | ES2092420T3 (en) |
RU (1) | RU2133870C1 (en) |
WO (1) | WO1995013469A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7048516B2 (en) * | 2003-06-09 | 2006-05-23 | Delphi Technologies, Inc. | High pressure fuel pump with multiple radial plungers |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3771506A (en) * | 1972-06-07 | 1973-11-13 | Stanadyne Inc | Fuel injection pump and automatic timing means therefor |
US3938911A (en) * | 1973-02-28 | 1976-02-17 | Stanadyne, Inc. | Fuel injection pump with metering valve controlled cooling |
FR2437502A1 (en) * | 1978-09-29 | 1980-04-25 | Cav Roto Diesel | FUEL INJECTION PUMP |
DE3342993A1 (en) * | 1982-12-06 | 1984-06-07 | Nissan Motor Co., Ltd., Yokohama, Kanagawa | CONTROL DEVICE FOR THE FUEL INJECTION AMOUNT IN AN INTERNAL COMBUSTION ENGINE |
DE3412834A1 (en) * | 1984-04-05 | 1985-10-24 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION PUMP |
GB8410280D0 (en) * | 1984-04-19 | 1984-05-31 | Lumber P M P | Rotary distributor pump |
DE3612942A1 (en) * | 1986-04-17 | 1987-10-22 | Bosch Gmbh Robert | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
DE3719831A1 (en) * | 1987-06-13 | 1988-12-22 | Bosch Gmbh Robert | FUEL INJECTION PUMP |
DE3816508A1 (en) * | 1988-05-14 | 1989-11-23 | Bosch Gmbh Robert | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINE |
GB8902860D0 (en) * | 1989-02-09 | 1989-03-30 | Lucas Ind Plc | Fuel injection pump |
US5215060A (en) * | 1991-07-16 | 1993-06-01 | Stanadyne Automotive Corp. | Fuel system for rotary distributor fuel injection pump |
GB9315342D0 (en) * | 1993-07-23 | 1993-09-08 | Lucas Ind Plc | Fuel pumping apparatus |
-
1993
- 1993-11-10 DE DE4338344A patent/DE4338344A1/en not_active Withdrawn
-
1994
- 1994-10-28 EP EP95900049A patent/EP0678161B1/en not_active Expired - Lifetime
- 1994-10-28 RU RU95117079A patent/RU2133870C1/en not_active IP Right Cessation
- 1994-10-28 US US08/464,896 patent/US5592920A/en not_active Expired - Fee Related
- 1994-10-28 KR KR1019950702839A patent/KR100333453B1/en not_active IP Right Cessation
- 1994-10-28 ES ES95900049T patent/ES2092420T3/en not_active Expired - Lifetime
- 1994-10-28 JP JP7513522A patent/JPH08505681A/en active Pending
- 1994-10-28 WO PCT/DE1994/001267 patent/WO1995013469A1/en active IP Right Grant
- 1994-10-28 DE DE59400598T patent/DE59400598D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9513469A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR100333453B1 (en) | 2002-09-17 |
ES2092420T3 (en) | 1996-11-16 |
EP0678161B1 (en) | 1996-09-04 |
KR960700405A (en) | 1996-01-20 |
RU2133870C1 (en) | 1999-07-27 |
US5592920A (en) | 1997-01-14 |
DE59400598D1 (en) | 1996-10-10 |
DE4338344A1 (en) | 1995-05-11 |
JPH08505681A (en) | 1996-06-18 |
WO1995013469A1 (en) | 1995-05-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0295420B1 (en) | Fuel injection pump | |
DE10256477A1 (en) | Fuel injection pump with feed pump assembly | |
DE60301312T2 (en) | Fuel pump assembly | |
DE3809700C2 (en) | ||
WO1989000243A1 (en) | Fuel injection pump | |
DE3740956C2 (en) | ||
EP0318535B1 (en) | Fuel injection pump | |
DE3013088A1 (en) | Fuel injection pump for compression ignition engine - has stepped piston for independent control of injection duration | |
DE2258309A1 (en) | FUEL INJECTION PUMP FOR COMBUSTION MACHINES | |
EP0073968B1 (en) | Fuel-injection pump | |
EP0177752B1 (en) | Fuel injection pump for diesel engines | |
EP0678161B1 (en) | Fuel-injection distributor pump for internal-combustion engines | |
DE901120C (en) | Injection pump with volume control without backflow | |
DE3719833C2 (en) | Fuel injection pump | |
DE2647788C2 (en) | ||
DE3334199A1 (en) | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES | |
EP0877163B1 (en) | Fuel injection pump | |
DE4441113C1 (en) | High pressure fuel pump for internal combustion engines | |
EP0757173A2 (en) | Fuel injection system | |
EP0906506B1 (en) | Fuel injection pump for an internal combustion engine | |
DE3719892C2 (en) | Radial piston type fuel injection pump | |
DE4139907A1 (en) | High pressure fuel injection device - has labyrinth seal between pump piston and cylinder liner, or between nozzle pin and housing | |
EP1538336B1 (en) | Dosing pump | |
DE1129770B (en) | Fuel injection pump for multi-cylinder internal combustion engines | |
AT315579B (en) | Piston pump for pumping two liquids |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB |
|
17P | Request for examination filed |
Effective date: 19951120 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
17Q | First examination report despatched |
Effective date: 19960214 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE ES FR GB |
|
ET | Fr: translation filed | ||
REF | Corresponds to: |
Ref document number: 59400598 Country of ref document: DE Date of ref document: 19961010 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2092420 Country of ref document: ES Kind code of ref document: T3 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19961107 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20071026 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20071022 Year of fee payment: 14 Ref country code: FR Payment date: 20071019 Year of fee payment: 14 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20081028 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20090630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20081031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20081028 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20081029 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20081029 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20091215 Year of fee payment: 16 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 59400598 Country of ref document: DE Effective date: 20110502 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110502 |