EP2798210A1 - High-pressure fuel pump for a fuel injection system - Google Patents
High-pressure fuel pump for a fuel injection systemInfo
- Publication number
- EP2798210A1 EP2798210A1 EP12818522.0A EP12818522A EP2798210A1 EP 2798210 A1 EP2798210 A1 EP 2798210A1 EP 12818522 A EP12818522 A EP 12818522A EP 2798210 A1 EP2798210 A1 EP 2798210A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow cylinder
- seal
- pressure fuel
- pump
- pump piston
- 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
- 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
- F04B1/0408—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
- 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
- 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
- F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers
-
- 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
- F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
-
- 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
Definitions
- the invention relates to a high-pressure fuel pump designed in particular as a plug-in pump for a fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine having the features of the preamble of claim 1.
- a high-pressure fuel pump designed as a plug-in pump for an internal combustion engine is disclosed, for example, in the published patent application DE 10 2008 002 195 A1. It comprises a piston which is accommodated in a hollow cylinder and has one end which projects beyond the hollow cylinder and can be displaced into a reciprocating movement by a compression spring against a radial projection of a drive shaft rotating about an axis in the hollow cylinder.
- the hollow cylinder superior end of the piston and the hollow cylinder are liquid-tightly connected by a bellows and a from Bellows, the hollow cylinder and the pump piston enclosed annular space is connected to a leakage line, the leakage line opens directly into the annulus.
- Bellows seals of the aforementioned type are among the contactless sealing method. They have the disadvantage that a defect leads to the immediate failure of the internal combustion engine.
- contacting sealing methods such as rod seals and metallic seals are known, which have a leakage-resistant Form th ring gap. By tightening the exhaust gas, such leakage is no longer acceptable.
- the present invention is therefore based on the object, a high-pressure fuel pump, in particular plug-in pump to specify, via which a permanently secure media separation is ensured.
- the proposed high-pressure fuel pump, in particular plug-in pump, for a fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine comprises a liftable pump piston whose first end is guided in a hollow cylinder and whose second end is supported indirectly via a cup-shaped component on a cam or eccentric shaft. Furthermore, the high-pressure pump comprises a preferably designed as a bellows seal, which is attached to form an annular space on the one hand on the pump piston and on the other hand on the hollow cylinder. According to the invention, a guide gap formed between the pump piston and the hollow cylinder is designed as an annular gap seal for sealing the annular space.
- the guide gap opens into an annular groove formed in the hollow cylinder, which is connected to a leakage line for returning a leakage amount.
- both a contactless and a contacting sealing method are used.
- the combination of both sealing methods thus ensures a particularly secure media separation.
- the internal combustion engine can continue to operate, since a seal is still ensured via the annular gap seal.
- a further formed between the pump piston and the hollow cylinder and opening into the annular groove guide gap is designed as an annular gap seal.
- the further guide gap is separated from the first guide gap via the annular groove formed in the hollow cylinder. This ensures that a leakage quantity flowing over the further guide gap into the annular groove is dissipated via the leakage line connected thereto and does not pass into the annular space enclosed by the preferably designed as a bellows seal. In this way, pressure pulsations in the annulus are avoided and consequently the annulus enclosing seal relieved.
- the required lengths and l 2 of the two executed as annular gap seals guide column can be determined by simulation. Preferably, the length l 2 of the further guide gap is greater than the length of the first guide gap selected.
- the seal is preferably designed as a bellows attached to an outer peripheral surface of the pump piston. In this way, the volume of the enclosed by the seal annulus is minimized. Further preferably, the attachment of the seal on the pump piston by means of a crimp ring.
- the crimp ring allows a gas-tight connection of the seal to the pump piston. Alternatively or additionally, further fastening means may be provided.
- the seal which is preferably designed as a bellows, is fastened to an outer peripheral surface of the hollow cylinder.
- the fastening takes place again by means of a crimp ring, in order at the same time to effect a gas-tight connection.
- the collar is attached radially inwardly to the hollow cylinder and extends the annular gap seal designed as a guide gap between the pump piston and the hollow cylinder.
- the preferably designed as a bellows seal comes to lie in this way close to the pump piston, whereby the volume of the enclosed seal of the annular space on is minimized.
- direct contact of the individual folds of the seal, which is preferably designed as a bellows, with the pump piston should be avoided in order to increase the service life of the seal.
- the length of the preferably designed as a bellows seal is therefore to be chosen such that the opening angle of the individual folds during a stroke of the pump piston is as small as possible.
- the seal is made of a resistant material, in particular of a plastic, such as polytetrafluoroethylene.
- FIG. 1 shows a longitudinal section through a designed as a plug-in pump according to the invention high-pressure fuel pump
- FIG. 2 shows a detail of FIG. 1 in the region of the guide of the pump piston
- Fig. 3 shows a detail of Fig. 1 in the region of the attachment of the bellows seal on the hollow cylinder and
- Fig. 4 is a perspective view of the bellows seal.
- the plug-in pump shown in FIG. 1 comprises a pump piston 1, whose first end 1.1 is received in a hollow cylinder 2 of a cylinder head and whose second end 1.2 is supported indirectly via a cup-shaped component 3 on a camshaft 4.
- the second end 1.2 forms a piston foot 17 on soft a spring plate 16 is placed for receiving a spring 15.
- the spring force of the spring 15 holds the cup-shaped component 3 and the pump piston 1 in contact with the camshaft 4.
- the spring 15 and the cup-shaped component 3 surround the hollow cylinder. 2
- the pump piston 1 and the hollow cylinder 2 are connected to seal a guide gap 7, 10 via a seal 5 designed as a bellows.
- the seal 5 is fastened on the one hand to an outer peripheral surface 11 of the pump piston 1 and on the other hand to an outer peripheral surface 13 of a collar 14 attached to the hollow cylinder 2.
- the fastening takes place by means of crimp rings 12 which effect a gas-tight connection of the seal 5 to the pump piston 1 and the hollow cylinder 2.
- the seal 5 designed as a bellows surrounds an annular space 6, in which the guide gap 7 opens.
- the guide gap 7 terminates at an annular groove 8 formed in the hollow cylinder 2, which is connected to a leakage line 9 for the return of a leakage amount emerging via the further guide gap 10. This ensures that the leakage quantity does not get into the annular space 6 and causes pressure pulsations which would stress the seal 5.
- the lengths and l 2 are chosen such that ⁇ l 2 .
- the optimal lengths, which ensure a sufficient seal for media separation, can be found out by simulation.
- the section of Fig. 3 shows the attachment of the bellows formed as a seal 5 on the collar 14 of the hollow cylinder 2 by means of a crimp ring 12.
- At the seal 5 are for receiving the crimp rings 12 at both ends of collar portions 18 are formed (see Fig. 4), which allow application of the crimp ring 12.
- the collar portions 18 further allow a flat application of the seal 5 on the outer peripheral surface 11 of the pump piston 1 and the outer peripheral surface 13 of the attached to the hollow cylinder 2 collar 14.
- the position of the collar portions 18 is selected such that the convolutions of the bellows at a distance with respect to the pump piston 1 are held.
- the volume of the annular space 6 is reduced to a minimum, in order to minimize the unwanted circulation volume at the same time.
- the seal 5 can also be realized by a differently designed membrane seal.
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 |
---|---|---|---|
DE102011089967A DE102011089967A1 (en) | 2011-12-27 | 2011-12-27 | High-pressure fuel pump for a fuel injection system |
PCT/EP2012/076918 WO2013098301A1 (en) | 2011-12-27 | 2012-12-27 | High-pressure fuel pump for a fuel injection system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2798210A1 true EP2798210A1 (en) | 2014-11-05 |
EP2798210B1 EP2798210B1 (en) | 2017-05-24 |
Family
ID=47603563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12818522.0A Not-in-force EP2798210B1 (en) | 2011-12-27 | 2012-12-27 | High-pressure fuel pump for a fuel injection system |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2798210B1 (en) |
CN (1) | CN104024635B (en) |
DE (1) | DE102011089967A1 (en) |
IN (1) | IN2014DN03227A (en) |
WO (1) | WO2013098301A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180096684A (en) * | 2015-12-16 | 2018-08-29 | 델피 테크놀로지스 아이피 리미티드 | High pressure pump with pump spring seal sleeve |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013216983A1 (en) | 2013-08-27 | 2015-03-05 | Robert Bosch Gmbh | pump |
IN2013DE03058A (en) | 2013-10-14 | 2015-04-17 | Continental Automotive Gmbh | |
DE102013224882A1 (en) | 2013-12-04 | 2015-06-11 | Robert Bosch Gmbh | Pump for conveying a fluid |
CN104728008A (en) * | 2013-12-23 | 2015-06-24 | 博世有限公司 | Fuel injection pump |
DE102014201849A1 (en) | 2014-02-03 | 2015-08-06 | Robert Bosch Gmbh | Pump for conveying a fluid |
DE102014202340A1 (en) | 2014-02-10 | 2015-08-13 | Robert Bosch Gmbh | Pump for conveying a fluid |
DE102014202338A1 (en) | 2014-02-10 | 2015-08-13 | Robert Bosch Gmbh | Pump for conveying a fluid |
DE102014202571A1 (en) | 2014-02-12 | 2015-08-13 | Robert Bosch Gmbh | Pump for conveying a fluid |
WO2016055250A1 (en) * | 2014-10-09 | 2016-04-14 | Robert Bosch Gmbh | Pump for supplying fuel at high pressure to an internal combustion engine |
DE102016105209A1 (en) | 2016-02-02 | 2017-08-03 | Darius Loba | High-pressure fuel pump with a weight-reduced piston |
DE102018204556B3 (en) * | 2018-03-26 | 2019-05-16 | Continental Automotive Gmbh | High-pressure fuel pump for a fuel injection system |
CN113217320A (en) * | 2021-05-12 | 2021-08-06 | 陈志昌 | Hydraulic-electric intelligent numerical control crankshaft wheel plunger pump |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2630123A1 (en) * | 1976-07-05 | 1978-01-12 | Messer Griesheim Gmbh | DEVICE FOR PROTECTING THE PISTON RODS OF PISTON PUMPS |
DE102004035188A1 (en) * | 2004-07-21 | 2006-02-16 | Bosch Rexroth Aktiengesellschaft | pump |
US7677155B2 (en) * | 2006-01-13 | 2010-03-16 | Gm Global Technology Operations, Inc. | Statically sealed high pressure fuel pump and method |
DE102008002088A1 (en) * | 2008-05-30 | 2009-12-03 | Robert Bosch Gmbh | High-pressure fuel pump |
DE102008002195A1 (en) | 2008-06-04 | 2009-12-10 | Robert Bosch Gmbh | Plug-in pump for internal combustion engine, has hollow cylinder and piston end connected with each other in fluid-tight manner by bellows, where annular space enclosing piston is attached to leakage line |
DE102010030342A1 (en) * | 2010-06-22 | 2011-12-22 | Robert Bosch Gmbh | piston pump |
-
2011
- 2011-12-27 DE DE102011089967A patent/DE102011089967A1/en not_active Withdrawn
-
2012
- 2012-12-27 CN CN201280062345.9A patent/CN104024635B/en not_active Expired - Fee Related
- 2012-12-27 WO PCT/EP2012/076918 patent/WO2013098301A1/en active Application Filing
- 2012-12-27 EP EP12818522.0A patent/EP2798210B1/en not_active Not-in-force
-
2014
- 2014-04-22 IN IN3227DEN2014 patent/IN2014DN03227A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2013098301A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180096684A (en) * | 2015-12-16 | 2018-08-29 | 델피 테크놀로지스 아이피 리미티드 | High pressure pump with pump spring seal sleeve |
Also Published As
Publication number | Publication date |
---|---|
WO2013098301A1 (en) | 2013-07-04 |
CN104024635B (en) | 2016-09-07 |
IN2014DN03227A (en) | 2015-05-22 |
EP2798210B1 (en) | 2017-05-24 |
DE102011089967A1 (en) | 2013-06-27 |
CN104024635A (en) | 2014-09-03 |
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